Zubin pushed to branch wip/inline-fs at Glasgow Haskell Compiler / GHC

Commits:

• 8650338d
  by Jan Hrček at 2024-06-06T10:39:24-04:00

  Improve haddocks of Language.Haskell.Syntax.Pat.Pat
  

• 2eee65e1
  by Cheng Shao at 2024-06-06T10:40:00-04:00

  testsuite: bump T7653 timeout for wasm
  

• 990fed60
  by Sylvain Henry at 2024-06-07T14:45:23-04:00

  StgToCmm: refactor opTranslate and friends
  
  - Change arguments order to avoid `\args -> ...` lambdas
  - Fix documentation
  - Rename StgToCmm options ("big" doesn't mean anything)
  

• 1afad514
  by Sylvain Henry at 2024-06-07T14:45:23-04:00

  NCG x86: remove dead code (#5444)
  
  Since 6755d833af8c21bbad6585144b10e20ac4a0a1ab this code is dead.
  

• 595c0894
  by Cheng Shao at 2024-06-07T14:45:58-04:00

  testsuite: skip objc-hi/objcxx-hi when cross compiling
  
  objc-hi/objcxx-hi should be skipped when cross compiling. The existing
  opsys('darwin') predicate only asserts the host system is darwin but
  tells us nothing about the target, hence the oversight.
  

• edfe6140
  by qqwy at 2024-06-08T11:23:54-04:00

  Replace '?callStack' implicit param with HasCallStack in GHC.Internal.Exception.throw
  

• 35a64220
  by Cheng Shao at 2024-06-08T11:24:30-04:00

  rts: cleanup inlining logic
  
  This patch removes pre-C11 legacy code paths related to
  INLINE_HEADER/STATIC_INLINE/EXTERN_INLINE macros, ensure EXTERN_INLINE
  is treated as static inline in most cases (fixes #24945), and also
  corrects the comments accordingly.
  

• 9ea90ed2
  by Andrew Lelechenko at 2024-06-08T11:25:06-04:00

  CODEOWNERS: add @core-libraries to track base interface changes
  
  A low-tech tactical solution for #24919
  

• 580fef7b
  by Ben Gamari at 2024-06-09T01:27:21-04:00

  ghc-internal: Update CHANGELOG to reflect current version
  

• 391ecff5
  by Ben Gamari at 2024-06-09T01:27:21-04:00

  ghc-internal: Update prologue.txt to reflect package description
  

• 3dca3b7d
  by Ben Gamari at 2024-06-09T01:27:57-04:00

  compiler: Clarify comment regarding need for MOVABS
  
  The comment wasn't clear in stating that it was only applicable to
  immediate source and memory target operands.
  

• 6bd850e8
  by doyougnu at 2024-06-09T21:02:14-04:00

  JS: establish single source of truth for symbols
  
  In pursuit of: #22736.
  
  This MR moves ad-hoc symbols used throughout the js backend into a
  single symbols file. Why? First, this cleans up the code by removing
  ad-hoc strings created on the fly and therefore makes the code more
  maintainable. Second, it makes it much easier to eventually type these
  identifiers.
  

• f3017dd3
  by Cheng Shao at 2024-06-09T21:02:49-04:00

  rts: replace ad-hoc MYTASK_USE_TLV with proper CC_SUPPORTS_TLS
  
  This patch replaces the ad-hoc `MYTASK_USE_TLV` with the
  `CC_SUPPORTS_TLS` macro. If TLS support is detected by autoconf, then
  we should use that for managing `myTask` in the threaded RTS.
  

• e17d7e8c
  by Ben Gamari at 2024-06-11T05:25:21-04:00

  users-guide: Fix stylistic issues in 9.12 release notes
  

• 8a8a982a
  by Hugo Peters at 2024-06-11T05:25:57-04:00

  fix typo in the simplifier debug output:
  
  baling -> bailing
  

• 16475bb8
  by Hécate Moonlight at 2024-06-12T03:07:55-04:00

  haddock: Correct the Makefile to take into account Darwin systems
  

• a2f60da5
  by Hécate Kleidukos at 2024-06-12T03:08:35-04:00

  haddock: Remove obsolete links to github.com/haskell/haddock in the docs
  

• de4395cd
  by qqwy at 2024-06-12T03:09:12-04:00

  Add `__GLASGOW_HASKELL_ASSERTS_IGNORED__` as CPP macro name if `-fasserts-ignored is set.
  
  This allows users to create their own Control.Exception.assert-like functionality that
  does something other than raising an `AssertFailed` exception.
  
  Fixes #24967
  

• 0e9c4dee
  by Ryan Hendrickson at 2024-06-12T03:09:53-04:00

  compiler: add hint to TcRnBadlyStaged message
  

• 2747cd34
  by Simon Peyton Jones at 2024-06-12T12:51:37-04:00

  Fix a QuickLook bug
  
  This MR fixes the bug exposed by #24676.  The problem was that
  quickLookArg was trying to avoid calling tcInstFun unnecessarily; but
  it was in fact necessary.  But that in turn forced me into a
  significant refactoring, putting more fields into EValArgQL.
  
  Highlights: see Note [Quick Look overview] in GHC.Tc.Gen.App
  
  * Instantiation variables are now distinguishable from ordinary
    unification variables, by level number = QLInstVar. This is
    treated like "level infinity".  See Note [The QLInstVar TcLevel]
    in GHC.Tc.Utils.TcType.
  
  * In `tcApp`, we don't track the instantiation variables in a set Delta
    any more; instead, we just tell them apart by their level number.
  
  * EValArgQL now much more clearly captures the "half-done" state
    of typechecking an argument, ready for later resumption.
    See Note [Quick Look at value arguments] in GHC.Tc.Gen.App
  
  * Elminated a bogus (never used) fast-path in
    GHC.Tc.Utils.Instantiate.instCallConstraints
    See Note [Possible fast path for equality constraints]
  
  Many other small refactorings.
  

• 1b1523b1
  by George Thomas at 2024-06-12T12:52:18-04:00

  Fix non-compiling extensible record `HasField` example

• 97b141a3
  by Zubin Duggal at 2024-06-12T12:52:55-04:00

  haddock: Fix hyperlinker source urls (#24907)
  
  This fixes a bug introduced by f56838c36235febb224107fa62334ebfe9941aba Links to
  external modules in the hyperlinker are uniformly generated using splicing the
  template given to us instead of attempting to construct the url in an ad-hoc manner.
  

• 954f864c
  by Zubin Duggal at 2024-06-12T12:52:55-04:00

  haddock: Add name anchor to external source urls from documentation page
  
  URLs for external source links from documentation pages were missing a splice
  location for the name.
  
  Fixes #24912
  

• b0b64177
  by Simon Peyton Jones at 2024-06-12T12:53:31-04:00

  Prioritise nominal equalities
  
  The main payload of this patch is
  
  * Prioritise nominal equalities in the constraint solver. This
    ameliorates the incompleteness of solving for representational
    constraints over newtypes: see #24887.
  
     See (EX2) in Note [Decomposing newtype equalities] in
     GHC.Tc.Solver.Equality
  
  In doing this patch I tripped over some other things that I refactored:
  
  * Move `isCoVarType` from `GHC.Core.Type` to `GHC.Core.Predicate`
    where it seems more at home.
  
  * Clarify the "rewrite role" of a constraint.  I was very puzzled
    about what the role of, say `(Eq a)` might be, but see the new
    Note [The rewrite-role of a constraint].
  
    In doing so I made predTypeEqRel crash when given a non-equality.
    Usually it expects an equality; but it was being mis-used for
    the above rewrite-role stuff.
  

• cb7c1b83
  by Liam Goodacre at 2024-06-12T12:54:09-04:00

  compiler: missing-deriving-strategies suggested fix
  
  Extends the missing-deriving-strategies warning with a suggested fix
  that includes which deriving strategies were assumed.
  
  For info about the warning, see comments for
  `TcRnNoDerivStratSpecified`, `TcRnNoDerivingClauseStrategySpecified`, &
  `TcRnNoStandaloneDerivingStrategySpecified`.
  
  For info about the suggested fix, see
  `SuggestExplicitDerivingClauseStrategies` &
  `SuggestExplicitStandalanoDerivingStrategy`.
  
  docs: Rewords missing-deriving-strategies to mention the suggested fix.
  
  Resolves #24955
  

• 4e36d3a3
  by Jan Hrček at 2024-06-12T12:54:48-04:00

  Further haddocks improvements in Language.Haskell.Syntax.Pat.Pat
  

• 558353f4
  by Cheng Shao at 2024-06-12T12:55:24-04:00

  rts: use page sized mblocks on wasm
  
  This patch changes mblock size to page size on wasm. It allows us to
  simplify our wasi-libc fork, makes it much easier to test third party
  libc allocators like emmalloc/mimalloc, as well as experimenting with
  threaded RTS in wasm.
  

• b3cc5366
  by Matthew Pickering at 2024-06-12T23:06:57-04:00

  compiler: Make ghc-experimental not wired in
  
  If you need to wire in definitions, then place them in ghc-internal and
  reexport them from ghc-experimental.
  
  Ticket #24903
  

• 700eeab9
  by Hécate Kleidukos at 2024-06-12T23:07:37-04:00

  base: Use a more appropriate unicode arrow for the ByteArray diagram
  
  This commit rectifies the usage of a unicode arrow in favour of one that
  doesn't provoke mis-alignment.
  

• cca7de25
  by Matthew Pickering at 2024-06-12T23:08:14-04:00

  ghcup-metadata: Fix debian version ranges
  
  This was caught by `ghcup-ci` failing and attempting to install a deb12
  bindist on deb11.
  
  ```
  configure: WARNING: m4/prep_target_file.m4: Expecting YES/NO but got  in ArSupportsDashL_STAGE0. Defaulting to False.
  bin/ghc-toolchain-bin: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by bin/ghc-toolchain-bin)
  bin/ghc-toolchain-bin: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /tmp/tmp.LBhwvFbVoy/foobarbaz/.ghcup/tmp/ghcup-708d9668d5d82287/ghc-9.11.20240609-x86_64-unknown-linux/bin/../lib/x86_64-linux-ghc-9.11.20240609/libHSunix-2.8.5.1-inplace-ghc9.11.20240609.so)
  bin/ghc-toolchain-bin: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /tmp/tmp.LBhwvFbVoy/foobarbaz/.ghcup/tmp/ghcup-708d9668d5d82287/ghc-9.11.20240609-x86_64-unknown-linux/bin/../lib/x86_64-linux-ghc-9.11.20240609/libHSunix-2.8.5.1-inplace-ghc9.11.20240609.so)
  ```
  
  Fixes #24974
  

• 7b23ce8b
  by Pierre Le Marre at 2024-06-13T15:35:04-04:00

  ucd2haskell: remove Streamly dependency + misc
  
  - Remove dead code.
  - Remove `streamly` dependency.
  - Process files with `bytestring`.
  - Replace Unicode files parsers with the corresponding ones from the
    package `unicode-data-parser`.
  - Simplify cabal file and rename module
  - Regenerate `ghc-internal` Unicode files with new header
  

• 4570319f
  by Jacco Krijnen at 2024-06-13T15:35:41-04:00

  Document how to run haddocks tests (#24976)
  
  Also remove ghc 9.7 requirement
  

• fb629e24
  by amesgen at 2024-06-14T00:28:20-04:00

  compiler: refactor lower_CmmExpr_Ptr
  

• def46c8c
  by amesgen at 2024-06-14T00:28:20-04:00

  compiler: handle CmmRegOff in lower_CmmExpr_Ptr
  

• ce76bf78
  by Simon Peyton Jones at 2024-06-14T00:28:56-04:00

  Small documentation update in Quick Look
  

• 19bcfc9b
  by Simon Peyton Jones at 2024-06-14T14:44:19-04:00

  Add hack for #24623
  
  ..Th bug in #24623 is randomly triggered by this MR!..
  

• 7a08a025
  by Simon Peyton Jones at 2024-06-14T14:44:19-04:00

  Various fixes to type-tidying
  
  This MR was triggered by #24868, but I found a number of bugs
  and infelicities in type-tidying as I went along.  Highlights:
  
  * Fix to #24868 is in GHC.Tc.Errors.report_unsolved: avoid
    using the OccNames of /bound/ variables when tidying /free/
    variables; see the call to `tidyAvoiding`.  That avoid the
    gratuitous renaming which was the cause of #24868. See
       Note [tidyAvoiding] in GHC.Core.TyCo.Tidy
  
  * Refactor and document the tidying of open types.
    See GHC.Core.TyCo.Tidy
       Note [Tidying open types]
       Note [Tidying is idempotent]
  
  * Tidy the coercion variable in HoleCo. That's important so
    that tidied types have tidied kinds.
  
  * Some small renaming to make things consistent.  In particular
    the "X" forms return a new TidyEnv.  E.g.
       tidyOpenType  :: TidyEnv -> Type -> Type
       tidyOpenTypeX :: TidyEnv -> Type -> (TidyEnv, Type)
  

• 2eac0288
  by Simon Peyton Jones at 2024-06-14T14:44:19-04:00

  Wibble
  

• e5d24cc2
  by Simon Peyton Jones at 2024-06-14T14:44:20-04:00

  Wibbles
  

• 246bc3a4
  by Simon Peyton Jones at 2024-06-14T14:44:56-04:00

  Localise a case-binder in SpecConstr.mkSeqs
  
  This small change fixes #24944
  
  See (SCF1) in Note [SpecConstr and strict fields]
  

• a5994380
  by Sylvain Henry at 2024-06-15T03:20:29-04:00

  PPC: display foreign label in panic message (cf #23969)
  

• bd95553a
  by Rodrigo Mesquita at 2024-06-15T03:21:06-04:00

  cmm: Parse MO_BSwap primitive operation
  
  Parsing this operation allows it to be tested using `test-primops` in a
  subsequent MR.
  

• e0099721
  by Andrew Lelechenko at 2024-06-16T17:57:38-04:00

  Make flip representation polymorphic, similar to ($) and (&)
  
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/245
  

• 118a1292
  by Alan Zimmerman at 2024-06-16T17:58:15-04:00

  EPA: Add location to Match Pats list
  
  So we can freely modify the pats and the following item spacing will
  still be valid when exact printing.
  
  Closes #24862
  

• db343324
  by Fabricio de Sousa Nascimento at 2024-06-17T10:01:51-04:00

  compiler: Rejects RULES whose LHS immediately fails to type-check
  
  Fixes GHC crashing on `decomposeRuleLhs` due to ignoring coercion values. This
  happens when we have a RULE that does not type check, and enable
  `-fdefer-type-errors`. We prevent this to happen by rejecting RULES with an
  immediately LHS type error.
  
  Fixes #24026
  

• e7a95662
  by Dylan Thinnes at 2024-06-17T10:02:35-04:00

  Add hscTypecheckRenameWithDiagnostics, for HLS (#24996)
  
  Use runHsc' in runHsc so that both functions can't fall out of sync
  
  We're currently copying parts of GHC code to get structured warnings
  in HLS, so that we can recreate `hscTypecheckRenameWithDiagnostics`
  locally. Once we get this function into GHC we can drop the copied code
  in future versions of HLS.
  

• d70abb49
  by sheaf at 2024-06-18T18:47:20-04:00

  Clarify -XGADTs enables existential quantification
  
  Even though -XGADTs does not turn on -XExistentialQuantification,
  it does allow the user of existential quantification syntax, without
  needing to use GADT-style syntax.
  
  Fixes #20865
  

• 13fdf788
  by David Binder at 2024-06-18T18:48:02-04:00

  Add RTS flag --read-tix-file (GHC Proposal 612)
  
  This commit introduces the RTS flag `--read-tix-file=<yes|no>` which
  controls whether a preexisting .tix file is read in at the beginning
  of a program run. The default is currently `--read-tix-file=yes` but
  will change to `--read-tix-file=no` in a future release of GHC. For
  this reason, whenever a .tix file is read in a warning is emitted to
  stderr. This warning can be silenced by explicitly passing the
  `--read-tix-file=yes` option. Details can be found in the GHC proposal
  cited below.
  
  Users can query whether this flag has been used with the help of the
  module `GHC.RTS.Flags`. A new field `readTixFile` was added to the
  record `HpcFlags`.
  
  These changes have been discussed and approved in
  - GHC proposal 612: https://github.com/ghc-proposals/ghc-proposals/pull/612
  - CLC proposal 276: https://github.com/haskell/core-libraries-committee/issues/276
  

• f0e3cb6a
  by Fendor at 2024-06-18T18:48:38-04:00

  Improve sharing of duplicated values in `ModIface`, fixes #24723
  
  As a `ModIface` often contains duplicated values that are not
  necessarily shared, we improve sharing by serialising the `ModIface`
  to an in-memory byte array. Serialisation uses deduplication tables, and
  deserialisation implicitly shares duplicated values.
  
  This helps reducing the peak memory usage while compiling in
  `--make` mode. The peak memory usage is especially smaller when
  generating interface files with core expressions
  (`-fwrite-if-simplified-core`).
  
  On agda, this reduces the peak memory usage:
  
  * `2.2 GB` to `1.9 GB` for a ghci session.
  
  On `lib:Cabal`, we report:
  
  * `570 MB` to `500 MB` for a ghci session
  * `790 MB` to `667 MB` for compiling `lib:Cabal` with ghc
  
  There is a small impact on execution time, around 2% on the agda code
  base.
  

• 1bab7dde
  by Fendor at 2024-06-18T18:48:38-04:00

  Avoid unneccessarily re-serialising the `ModIface`
  
  To reduce memory usage of `ModIface`, we serialise `ModIface` to an
  in-memory byte array, which implicitly shares duplicated values.
  
  This serialised byte array can be reused to avoid work when we actually
  write the `ModIface` to disk.
  We introduce a new field to `ModIface` which allows us to save the byte
  array, and write it direclty to disk if the `ModIface` wasn't changed
  after the initial serialisation.
  
  This requires us to change absolute offsets, for example to jump to the
  deduplication table for `Name` or `FastString` with relative offsets, as
  the deduplication byte array doesn't contain header information, such as
  fingerprints.
  To allow us to dump the binary blob to disk, we need to replace all
  absolute offsets with relative ones.
  
  We introduce additional helpers for `ModIface` binary serialisation, which
  construct relocatable binary blobs. We say the binary blob is relocatable,
  if the binary representation can be moved and does not contain any
  absolute offsets.
  
  Further, we introduce new primitives for `Binary` that allow to create
  relocatable binaries, such as `forwardGetRel` and `forwardPutRel`.
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesDefsGhcWithCore
  Metric Increase:
      MultiComponentModules
      MultiLayerModules
      T10421
      T12150
      T12234
      T12425
      T13035
      T13253-spj
      T13701
      T13719
      T14697
      T15703
      T16875
      T18698b
      T18140
      T18304
      T18698a
      T18730
      T18923
      T20049
      T24582
      T5837
      T6048
      T9198
      T9961
      mhu-perf
  -------------------------
  
  These metric increases may look bad, but they are all completely benign,
  we simply allocate 1 MB per module for `shareIface`. As this allocation
  is quite quick, it has a negligible impact on run-time performance.
  In fact, the performance difference wasn't measurable on my local
  machine. Reducing the size of the pre-allocated 1 MB buffer avoids these
  test failures, but also requires us to reallocate the buffer if the
  interface file is too big. These reallocations *did* have an impact on
  performance, which is why I have opted to accept all these metric
  increases, as the number of allocated bytes is merely a guidance.
  
  This 1MB allocation increase causes a lot of tests to fail that
  generally have a low allocation number. E.g., increasing from 40MB to
  41MB is a 2.5% increase.
  In particular, the tests T12150, T13253-spj, T18140, T18304, T18698a,
  T18923, T20049, T24582, T5837, T6048, and T9961 only fail on i386-darwin
  job, where the number of allocated bytes seems to be lower than in other
  jobs.
  The tests T16875 and T18698b fail on i386-linux for the same reason.
  

• 099992df
  by Andreas Klebinger at 2024-06-18T18:49:14-04:00

  Improve documentation of @Any@ type.
  
  In particular mention possible uses for non-lifted types.
  
  Fixes #23100.
  

• 5e75412b
  by Jakob Bruenker at 2024-06-18T18:49:51-04:00

  Update user guide to indicate support for 64-tuples
  

• 4f5da595
  by Andreas Klebinger at 2024-06-18T18:50:28-04:00

  lint notes: Add more info to notes.stdout
  
  When fixing a note reference CI fails with a somewhat confusing diff.
  See #21123. This commit adds a line to the output file being compared
  which hopefully makes it clear this is the list of broken refs, not all
  refs.
  
  Fixes #21123
  

• 1eb15c61
  by Jakob Bruenker at 2024-06-18T18:51:04-04:00

  docs: Update mention of ($) type in user guide
  
  Fixes #24909
  

• 1d66c9e3
  by Jan Hrček at 2024-06-18T18:51:47-04:00

  Remove duplicate Anno instances
  

• 8ea0ba95
  by Sven Tennie at 2024-06-18T18:52:23-04:00

  AArch64: Delete unused RegNos
  
  This has the additional benefit of getting rid of the -1 encoding (real
  registers start at 0.)
  

• 325422e0
  by Sjoerd Visscher at 2024-06-18T18:53:04-04:00

  Bump stm submodule to current master
  

• 64fba310
  by Cheng Shao at 2024-06-18T18:53:40-04:00

  testsuite: bump T17572 timeout on wasm32
  

• eb612fbc
  by Sven Tennie at 2024-06-19T06:46:00-04:00

  AArch64: Simplify BL instruction
  
  The BL constructor carried unused data in its third argument.
  

• b0300503
  by Alan Zimmerman at 2024-06-19T06:46:36-04:00

  TTG: Move SourceText from `Fixity` to `FixitySig`
  
  It is only used there, simplifies the use of `Fixity` in the rest of
  the code, and is moved into a TTG extension point.
  
  Precedes !12842, to simplify it
  

• 842e119b
  by Rodrigo Mesquita at 2024-06-19T06:47:13-04:00

  base: Deprecate some .Internal modules
  
  Deprecates the following modules according to clc-proposal #217:
  https://github.com/haskell/core-libraries-committee/issues/217
  
  * GHC.TypeNats.Internal
  * GHC.TypeLits.Internal
  * GHC.ExecutionStack.Internal
  
  Closes #24998
  

• 24e89c40
  by Jacco Krijnen at 2024-06-20T07:21:27-04:00

  ttg: Use List instead of Bag in AST for LHsBindsLR
  
  Considering that the parser used to create a Bag of binds using a
  cons-based approach, it can be also done using lists. The operations in
  the compiler don't really require Bag.
  
  By using lists, there is no dependency on GHC.Data.Bag anymore from the
  AST.
  
  Progress towards #21592
  

• 04f5bb85
  by Simon Peyton Jones at 2024-06-20T07:22:03-04:00

  Fix untouchability test
  
  This MR fixes #24938.  The underlying problem was tha the test for
  "does this implication bring in scope any equalities" was plain wrong.
  
  See
    Note [Tracking Given equalities] and
    Note [Let-bound skolems]
  both in GHC.Tc.Solver.InertSet.
  
  Then
  * Test LocalGivenEqs succeeds for a different reason than before;
    see (LBS2) in Note [Let-bound skolems]
  
  * New test T24938a succeeds because of (LBS2), whereas it failed
    before.
  
  * Test LocalGivenEqs2 now fails, as it should.
  
  * Test T224938, the repro from the ticket, fails, as it should.
  

• 9a757a27
  by Simon Peyton Jones at 2024-06-20T07:22:40-04:00

  Fix demand signatures for join points
  
  This MR tackles #24623 and #23113
  
  The main change is to give a clearer notion of "worker/wrapper arity", esp
  for join points. See GHC.Core.Opt.DmdAnal
       Note [Worker/wrapper arity and join points]
  This Note is a good summary of what this MR does:
  
  (1) The "worker/wrapper arity" of an Id is
      * For non-join-points: idArity
      * The join points: the join arity (Id part only of course)
      This is the number of args we will use in worker/wrapper.
      See `ww_arity` in `dmdAnalRhsSig`, and the function `workWrapArity`.
  
  (2) A join point's demand-signature arity may exceed the Id's worker/wrapper
      arity.  See the `arity_ok` assertion in `mkWwBodies`.
  
  (3) In `finaliseArgBoxities`, do trimBoxity on any argument demands beyond
      the worker/wrapper arity.
  
  (4) In WorkWrap.splitFun, make sure we split based on the worker/wrapper
      arity (re)-computed by workWrapArity.
  

• 5e8faaf1
  by Jan Hrček at 2024-06-20T07:23:20-04:00

  Update haddocks of Import/Export AST types
  

• cd512234
  by Hécate Kleidukos at 2024-06-20T07:24:02-04:00

  haddock: Update bounds in cabal files and remove allow-newer stanza in cabal.project
  

• 8a8ff8f2
  by Rodrigo Mesquita at 2024-06-20T07:24:38-04:00

  cmm: Don't parse MO_BSwap for W8
  
  Don't support parsing bswap8, since bswap8 is not really an operation
  and would have to be implemented as a no-op (and currently is not
  implemented at all).
  
  Fixes #25002
  

• 5cc472f5
  by sheaf at 2024-06-20T07:25:14-04:00

  Delete unused testsuite files
  
  These files were committed by mistake in !11902.
  This commit simply removes them.
  

• 7b079378
  by Matthew Pickering at 2024-06-20T07:25:50-04:00

  Remove left over debugging pragma from 2016
  
  This pragma was accidentally introduced in 648fd73a7b8fbb7955edc83330e2910428e76147
  
  The top-level cost centres lead to a lack of optimisation when compiling
  with profiling.
  

• c872e09b
  by Hécate Kleidukos at 2024-06-20T19:28:36-04:00

  haddock: Remove unused pragmata, qualify usages of Data.List functions, add more sanity checking flags by default
  
  This commit enables some extensions and GHC flags in the cabal file in a way
  that allows us to reduce the amount of prologuing on top of each file.
  
  We also prefix the usage of some List functions that removes ambiguity
  when they are also exported from the Prelude, like foldl'.
  In general, this has the effect of pointing out more explicitly
  that a linked list is used.
  
  Metric Increase:
      haddock.Cabal
      haddock.base
      haddock.compiler
  

• 8c87d4e1
  by Arnaud Spiwack at 2024-06-20T19:29:12-04:00

  Add test case for #23586
  

• 568de8a5
  by Arnaud Spiwack at 2024-06-20T19:29:12-04:00

  When matching functions in rewrite rules: ignore multiplicity
  
  When matching a template variable to an expression, we check that it
  has the same type as the matched expression. But if the variable `f` has
  type `A -> B` while the expression `e` has type `A %1 -> B`, the match was
  previously rejected.
  
  A principled solution would have `f` substituted by `\(%Many x) -> e
  x` or some other appropriate coercion. But since linearity is not
  properly checked in Core, we can be cheeky and simply ignore
  multiplicity while matching. Much easier.
  
  This has forced a change in the linter which, when `-dlinear-core-lint`
  is off, must consider that `a -> b` and `a %1 -> b` are equal. This is
  achieved by adding an argument to configure the behaviour of
  `nonDetCmpTypeX` and modify `ensureEqTys` to call to the new behaviour
  which ignores multiplicities when comparing two `FunTy`.
  
  Fixes #24725.
  

• c8a8727e
  by Simon Peyton Jones at 2024-06-20T19:29:12-04:00

  Faster type equality
  
  This MR speeds up type equality, triggered by perf regressions that
  showed up when fixing #24725 by parameterising type equality over
  whether to ignore multiplicity.
  
  The changes are:
  
  * Do not use `nonDetCmpType` for type /equality/. Instead use a specialised
    type-equality function, which we have always had!
  
    `nonDetCmpType` remains, but I did not invest effort in refactoring
    or optimising it.
  
  * Type equality is parameterised by
      - whether to expand synonyms
      - whether to respect multiplicities
      - whether it has a RnEnv2 environment
    In this MR I systematically specialise it for static values of these
    parameters.  Much more direct and predictable than before.  See
    Note [Specialising type equality]
  
  * We want to avoid comparing kinds if possible.  I refactored how this
    happens, at least for `eqType`.
    See Note [Casts and coercions in type comparison]
  
  * To make Lint fast, we want to avoid allocating a thunk for <msg> in
        ensureEqTypes ty1 ty2 <msg>
    because the test almost always succeeds, and <msg> isn't needed.
    See Note [INLINE ensureEqTys]
  
  Metric Decrease:
      T13386
      T5030
  

• 21fc180b
  by Ryan Hendrickson at 2024-06-22T10:40:55-04:00

  base: Add inits1 and tails1 to Data.List
  

• d640a3b6
  by Sebastian Graf at 2024-06-22T10:41:32-04:00

  Derive previously hand-written `Lift` instances (#14030)
  
  This is possible now that #22229 is fixed.
  

• 33fee6a2
  by Sebastian Graf at 2024-06-22T10:41:32-04:00

  Implement the "Derive Lift instances for data types in template-haskell" proposal (#14030)
  
  After #22229 had been fixed, we can finally derive the `Lift` instance for the
  TH AST, as proposed by Ryan Scott in
  https://mail.haskell.org/pipermail/libraries/2015-September/026117.html.
  
  Fixes #14030, #14296, #21759 and #24560.
  
  The residency of T24471 increases by 13% because we now load `AnnLookup`
  from its interface file, which transitively loads the whole TH AST.
  Unavoidable and not terrible, I think.
  
  Metric Increase:
      T24471
  

• 383c01a8
  by Matthew Pickering at 2024-06-22T10:42:08-04:00

  bindist: Use complete relative paths when cding to directories
  
  If a user has configured CDPATH on their system then `cd lib` may change
  into an unexpected directory during the installation process.
  
  If you write `cd ./lib` then it will not consult `CDPATH` to determine
  what you mean.
  
  I have added a check on ghcup-ci to verify that the bindist installation
  works in this situation.
  
  Fixes #24951
  

• 5759133f
  by Hécate Kleidukos at 2024-06-22T10:42:49-04:00

  haddock: Use the more precise SDocContext instead of DynFlags
  
  The pervasive usage of DynFlags (the parsed command-line options passed
  to ghc) blurs the border between different components of Haddock, and
  especially those that focus solely on printing text on the screen.
  
  In order to improve the understanding of the real dependencies of a
  function, the pretty-printer options are made concrete earlier in the
  pipeline instead of late when pretty-printing happens.
  
  This also has the advantage of clarifying which functions actually
  require DynFlags for purposes other than pretty-printing, thus making
  the interactions between Haddock and GHC more understandable when
  exploring the code base.
  
  See Henry, Ericson, Young. "Modularizing GHC".
  https://hsyl20.fr/home/files/papers/2022-ghc-modularity.pdf. 2022
  

• 749e089b
  by Alexander McKenna at 2024-06-22T10:43:24-04:00

  Add INLINE [1] pragma to compareInt / compareWord
  
  To allow rules to be written on the concrete implementation of
  `compare` for `Int` and `Word`, we need to have an `INLINE [1]`
  pragma on these functions, following the
  `matching_overloaded_methods_in_rules` note in `GHC.Classes`.
  
  CLC proposal https://github.com/haskell/core-libraries-committee/issues/179
  
  Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/22643
  

• db033639
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  ci: Enable strict ghc-toolchain setting for bindists
  

• 14308a8f
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  ghc-toolchain: Improve parse failure error
  
  Improves the error message for when `ghc-toolchain` fails to read a
  valid `Target` value from a file (in doFormat mode).
  

• 6e7cfff1
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  bindist: ghc-toolchain related options in configure
  

• 958d6931
  by Matthew Pickering at 2024-06-24T17:21:15-04:00

  ci: Fail when bindist configure fails when installing bindist
  
  It is better to fail earlier if the configure step fails rather than
  carrying on for a more obscure error message.
  

• f48d157d
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  ghc-toolchain: Fix error logging indentation
  

• f1397104
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  bindist: Correct default.target substitution
  
  The substitution on `default.target.in` must be done after
  `PREP_TARGET_FILE` is called -- that macro is responsible for
  setting the variables that will be effectively substituted in the target
  file. Otherwise, the target file is invalid.
  
  Fixes #24792 #24574
  

• 665e653e
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  configure: Prefer tool name over tool path
  
  It is non-obvious whether the toolchain configuration should use
  full-paths to tools or simply their names. In addressing #24574, we've
  decided to prefer executable names over paths, ultimately, because the
  bindist configure script already does this, thus is the default in ghcs
  out there.
  
  Updates the in-tree configure script to prefer tool names
  (`AC_CHECK_TOOL` rather than `AC_PATH_TOOL`) and `ghc-toolchain` to
  ignore the full-path-result of `findExecutable`, which it previously
  used over the program name.
  
  This change doesn't undo the fix in bd92182cd56140ffb2f68ec01492e5aa6333a8fc
  because `AC_CHECK_TOOL` still takes into account the target triples,
  unlike `AC_CHECK_PROG/AC_PATH_PROG`.
  

• 463716c2
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  dist: Don't forget to configure JavascriptCPP
  
  We introduced a configuration step for the javascript preprocessor, but
  only did so for the in-tree configure script.
  
  This commit makes it so that we also configure the javascript
  preprocessor in the configure shipped in the compiler bindist.
  

• e99cd73d
  by Rodrigo Mesquita at 2024-06-24T17:21:15-04:00

  distrib: LlvmTarget in distrib/configure
  
  LlvmTarget was being set and substituted in the in-tree configure, but
  not in the configure shipped in the bindist.
  
  We want to set the LlvmTarget to the canonical LLVM name of the platform
  that GHC is targetting.
  
  Currently, that is going to be the boostrapped llvm target (hence the
  code which sets LlvmTarget=bootstrap_llvm_target).
  

• 4199aafe
  by Matthew Pickering at 2024-06-24T17:21:51-04:00

  Update bootstrap plans for recent GHC versions (9.6.5, 9.8.2, 9.10.10)
  

• f599d816
  by Matthew Pickering at 2024-06-24T17:21:51-04:00

  ci: Add 9_10 bootstrap testing job
  

• 8f4b799d
  by Hécate Kleidukos at 2024-06-24T17:22:30-04:00

  haddock: Move the usage of mkParserOpts directly to ppHyperlinkedModuleSource in order to avoid passing a whole DynFlags
  
  Follow up to !12931
  

• 210cf1cd
  by Hécate Kleidukos at 2024-06-24T17:22:30-04:00

  haddock: Remove cabal file linting rule
  
  This will be reintroduced with a properly ignored commit
  when the cabal files are themselves formatted for good.
  

• 7fe85b13
  by Peter Trommler at 2024-06-24T22:03:41-04:00

  PPC NCG: Fix sign hints in C calls
  
  Sign hints for parameters are in the second component of the pair.
  
  Fixes #23034
  

• 949a0e0b
  by Andrew Lelechenko at 2024-06-24T22:04:17-04:00

  base: fix missing changelog entries
  

• 1bfa9111
  by Andreas Klebinger at 2024-06-26T21:49:53-04:00

  GHCi interpreter: Tag constructor closures when possible.
  
  When evaluating PUSH_G try to tag the reference we are pushing if it's a
  constructor. This is potentially helpful for performance and required to
  fix #24870.
  

• caf44a2d
  by Andrew Lelechenko at 2024-06-26T21:50:30-04:00

  Implement Data.List.compareLength and Data.List.NonEmpty.compareLength
  
  `compareLength xs n` is a safer and faster alternative to `compare (length xs) n`.
  The latter would force and traverse the entire spine (potentially diverging),
  while the former traverses as few elements as possible.
  
  The implementation is carefully designed to maintain as much laziness as possible.
  
  As per https://github.com/haskell/core-libraries-committee/issues/257
  

• f4606ae0
  by Serge S. Gulin at 2024-06-26T21:51:05-04:00

  Unicode: adding compact version of GeneralCategory (resolves #24789)
  
  The following features are applied:
  1. Lookup code like Cmm-switches (draft implementation proposed by Sylvain Henry @hsyl20)
  2. Nested ifs (logarithmic search vs linear search) (the idea proposed by Sylvain Henry @hsyl20)
  
  -------------------------
  Metric Decrease:
      size_hello_artifact
      size_hello_unicode
  -------------------------
  

• 0e424304
  by Hécate Kleidukos at 2024-06-26T21:51:44-04:00

  haddock: Restructure import statements
  
  This commit removes idiosyncrasies that have accumulated with the years
  in how import statements were laid out, and defines clear but simple
  guidelines in the CONTRIBUTING.md file.
  

• 9b8ddaaf
  by Arnaud Spiwack at 2024-06-26T21:52:23-04:00

  Rename test for #24725
  
  I must have fumbled my tabs when I copy/pasted the issue number in
  8c87d4e1136ae6d28e92b8af31d78ed66224ee16.
  

• b0944623
  by Arnaud Spiwack at 2024-06-26T21:52:23-04:00

  Add original reproducer for #24725
  

• 77ce65a5
  by Matthew Pickering at 2024-06-27T07:57:14-04:00

  Expand LLVM version matching regex for compability with bsd systems
  
  sed on BSD systems (such as darwin) does not support the + operation.
  
  Therefore we take the simple minded approach of manually expanding
  group+ to groupgroup*.
  
  Fixes #24999
  

• bdfe4a9e
  by Matthew Pickering at 2024-06-27T07:57:14-04:00

  ci: On darwin configure LLVMAS linker to match LLC and OPT toolchain
  
  The version check was previously broken so the toolchain was not
  detected at all.
  

• 07e03a69
  by Matthew Pickering at 2024-06-27T07:57:15-04:00

  Update nixpkgs commit for darwin toolchain
  
  One dependency (c-ares) changed where it hosted the releases which
  breaks the build with the old nixpkgs commit.
  

• 144afed7
  by Rodrigo Mesquita at 2024-06-27T07:57:50-04:00

  base: Add changelog entry for #24998
  

• eebe1658
  by Sylvain Henry at 2024-06-28T07:13:26-04:00

  X86/DWARF: support no tables-next-to-code and asm-shortcutting (#22792)
  
  - Without TNTC (tables-next-to-code), we must be careful to not
    duplicate labels in pprNatCmmDecl. Especially, as a CmmProc is
    identified by the label of its entry block (and not of its info
    table), we can't reuse the same label to delimit the block end and the
    proc end.
  
  - We generate debug infos from Cmm blocks. However, when
    asm-shortcutting is enabled, some blocks are dropped at the asm
    codegen stage and some labels in the DebugBlocks become missing.
    We fix this by filtering the generated debug-info after the asm
    codegen to only keep valid infos.
  
  Also add some related documentation.
  

• 6e86d82b
  by Sylvain Henry at 2024-06-28T07:14:06-04:00

  PPC NCG: handle JMP to ForeignLabels (#23969)
  

• 9e4b4b0a
  by Sylvain Henry at 2024-06-28T07:14:06-04:00

  PPC NCG: support loading 64-bit value on 32-bit arch (#23969)
  

• 50caef3e
  by Sylvain Henry at 2024-06-28T07:14:46-04:00

  Fix warnings in genapply
  

• 37139b17
  by Matthew Pickering at 2024-06-28T07:15:21-04:00

  libraries: Update os-string to 2.0.4
  
  This updates the os-string submodule to 2.0.4 which removes the usage of
  `TemplateHaskell` pragma.
  

• 0f3d3bd6
  by Sylvain Henry at 2024-06-30T00:47:40-04:00

  Bump array submodule
  

• 354c350c
  by Sylvain Henry at 2024-06-30T00:47:40-04:00

  GHCi: Don't use deprecated sizeofMutableByteArray#
  

• 35d65098
  by Ben Gamari at 2024-06-30T00:47:40-04:00

  primops: Undeprecate addr2Int# and int2Addr#
  
  addr2Int# and int2Addr# were marked as deprecated with the introduction
  of the OCaml code generator (1dfaee318171836b32f6b33a14231c69adfdef2f)
  due to its use of tagged integers. However, this backend has long
  vanished and `base` has all along been using `addr2Int#` in the Show
  instance for Ptr.
  
  While it's unlikely that we will have another backend which has tagged
  integers, we may indeed support platforms which have tagged pointers.
  Consequently we undeprecate the operations but warn the user that the
  operations may not be portable.
  

• 3157d817
  by Sylvain Henry at 2024-06-30T00:47:41-04:00

  primops: Undeprecate par#
  
  par# is still used in base and it's not clear how to replace it with
  spark# (see #24825)
  

• c8d5b959
  by Ben Gamari at 2024-06-30T00:47:41-04:00

  Primops: Make documentation generation more efficient
  
  Previously we would do a linear search through all primop names, doing a
  String comparison on the name of each when preparing the HsDocStringMap.
  Fix this.
  

• 65165fe4
  by Ben Gamari at 2024-06-30T00:47:41-04:00

  primops: Ensure that deprecations are properly tracked
  
  We previously failed to insert DEPRECATION pragmas into GHC.Prim's
  ModIface, meaning that they would appear in the Haddock documentation
  but not issue warnings. Fix this.
  
  See #19629. Haddock also needs to be fixed: https://github.com/haskell/haddock/issues/223
  
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  

• bc1d435e
  by Mario Blažević at 2024-06-30T00:48:20-04:00

  Improved pretty-printing of unboxed TH sums and tuples, fixes #24997
  

• 0d170eaf
  by Zubin Duggal at 2024-07-04T11:08:41-04:00

  compiler: Turn `FinderCache` into a record of operations so that GHC API clients can
  have full control over how its state is managed by overriding `hsc_FC`.
  
  Also removes the `uncacheModule` function as this wasn't being used by anything
  since 1893ba12fe1fa2ade35a62c336594afcd569736e
  
  Fixes #23604
  

• 4664997d
  by Teo Camarasu at 2024-07-04T11:09:18-04:00

  Add HasCallStack to T23221
  
  This makes the test a bit easier to debug
  

• 66919dcc
  by Teo Camarasu at 2024-07-04T11:09:18-04:00

  rts: use live words to estimate heap size
  
  We use live words rather than live blocks to determine the size of the
  heap for determining memory retention.
  
  Most of the time these two metrics align, but they can come apart in
  normal usage when using the nonmoving collector.
  
  The nonmoving collector leads to a lot of partially occupied blocks. So,
  using live words is more accurate.
  
  They can also come apart when the heap is suffering from high levels
  fragmentation caused by small pinned objects, but in this case, the
  block size is the more accurate metric. Since this case is best avoided
  anyway. It is ok to accept the trade-off that we might try (and
  probably) fail to return more memory in this case.
  
  See also the Note [Statistics for retaining memory]
  
  Resolves #23397
  

• 8dfca66a
  by Oleg Grenrus at 2024-07-04T11:09:55-04:00

  Add reflections of GHC.TypeLits/Nats type families
  
  -------------------------
  Metric Increase:
      ghc_experimental_dir
      ghc_experimental_so
  -------------------------
  

• 6c469bd2
  by Adam Gundry at 2024-07-04T11:10:33-04:00

  Correct -Wpartial-fields warning to say "Definition" rather than "Use"
  
  Fixes #24710.  The message and documentation for `-Wpartial-fields` were
  misleading as (a) the warning occurs at definition sites rather than use
  sites, and (b) the warning relates to the definition of a field independently
  of the selector function (e.g. because record updates are also partial).
  

• 977b6b64
  by Max Ulidtko at 2024-07-04T11:11:11-04:00

  GHCi: Support local Prelude
  
  Fixes #10920, an issue where GHCi bails out when started alongside a
  file named Prelude.hs or Prelude.lhs (even empty file suffices).
  
  The in-source Note [GHCi and local Preludes] documents core reasoning.
  
  Supplementary changes:
  
   * add debug traces for module lookups under -ddump-if-trace;
   * drop stale comment in GHC.Iface.Load;
   * reduce noise in -v3 traces from GHC.Utils.TmpFs;
   * new test, which also exercizes HomeModError.
  

• 87cf4111
  by Ryan Scott at 2024-07-04T11:11:47-04:00

  Add missing gParPat in cvtp's ViewP case
  
  When converting a `ViewP` using `cvtp`, we need to ensure that the view pattern
  is parenthesized so that the resulting code will parse correctly when
  roundtripped back through GHC's parser.
  
  Fixes #24894.
  

• b05613c5
  by Adam Gundry at 2024-07-04T11:12:23-04:00

  Use structured error representation for module cycle errors (see #18516)
  
  This removes the re-export of cyclicModuleErr from the top-level GHC module.
  

• 70389749
  by Adam Gundry at 2024-07-04T11:12:23-04:00

  Use structured error representation when reloading a nonexistent module
  

• 680ade3d
  by sheaf at 2024-07-04T11:12:23-04:00

  Use structured errors for a Backpack instantiation error
  

• 97c6d6de
  by sheaf at 2024-07-04T11:12:23-04:00

  Move mkFileSrcSpan to GHC.Unit.Module.Location
  

• f9e7bd9b
  by Adriaan Leijnse at 2024-07-04T11:12:59-04:00

  ttg: Remove SourceText from OverloadedLabel
  
  Progress towards #21592
  

• 00d63245
  by Alexander Foremny at 2024-07-04T11:12:59-04:00

  AST: GHC.Prelude -> Prelude
  
  Refactor occurrences to GHC.Prelude with Prelude within
  Language/Haskell.
  
  Progress towards #21592
  

• cc846ea5
  by Alexander Foremny at 2024-07-04T11:12:59-04:00

  AST: remove occurrences of GHC.Unit.Module.ModuleName
  
  `GHC.Unit.Module` re-exports `ModuleName` from
  `Language.Haskell.Syntax.Module.Name`.
  
  Progress towards #21592
  

• 24c7d287
  by Fabian Kirchner at 2024-07-04T11:12:59-04:00

  AST: move Data instance definition for ModuleName to GHC.Unit.Types
  
  To remove the dependency on GHC.Utils.Misc inside
  Language.Haskell.Syntax.Module.Name, the instance definition is moved
  from there into GHC.Unit.Types.
  
  Progress towards #21592
  

• 6cbba381
  by Fabian Kirchner at 2024-07-04T11:12:59-04:00

  AST: move negateOverLitVal into GHC.Hs.Lit
  
  The function negateOverLitVal is not used within Language.Haskell and
  therefore can be moved to the respective module inside GHC.Hs.
  
  Progress towards #21592
  

• 611aa7c6
  by Fabian Kirchner at 2024-07-04T11:12:59-04:00

  AST: move conDetailsArity into GHC.Rename.Module
  
  The function conDetailsArity is only used inside GHC.Rename.Module.  We
  therefore move it there from Language.Haskell.Syntax.Lit.
  
  Progress towards #21592
  

• 1b968d16
  by Mauricio at 2024-07-04T11:12:59-04:00

  AST: Remove GHC.Utils.Assert from GHC
  
  Simple cleanup.
  
  Progress towards #21592
  

• 3d192e5d
  by Fabian Kirchner at 2024-07-04T11:12:59-04:00

  ttg: extract Specificity, ForAllTyFlag and helper functions from GHC.Types.Var
  
  Progress towards #21592
  
  Specificity, ForAllTyFlag and its' helper functions are extracted from
  GHC.Types.Var and moved into a new module Language.Haskell.Syntax.Specificity.
  
  Note: Eventually (i.e. after Language.Haskell.Syntax.Decls does not depend on
  GHC.* anymore) these should be moved into Language.Haskell.Syntax.Decls.
  At this point, this would cause cyclic dependencies.
  

• 257d1adc
  by Adowrath at 2024-07-04T11:12:59-04:00

  ttg: Split HsSrcBang, remove ref to DataCon from Syntax.Type
  
  Progress towards #21592
  
  This splits HsSrcBang up, creating the new HsBang within
  `Language.Haskell.Syntax.Basic`. `HsBang` holds the unpackedness
  and strictness information, while `HsSrcBang` only adds the SourceText
  for usage within the compiler directly.
  
  Inside the AST, to preserve the SourceText, it is hidden behind the
  pre-existing extension point `XBindTy`. All other occurrences of
  `HsSrcBang` were adapted to deconstruct the inner `HsBang`, and when
  interacting with the `BindTy` constructor, the hidden `SourceText` is
  extracted/inserted into the `XBindTy` extension point.
  
  `GHC.Core.DataCon` exports both `HsSrcBang` and `HsBang` for
  convenience. A constructor function `mkHsSrcBang` that takes all
  individual components has been added.
  
  Two exceptions has been made though:
  - The `Outputable HsSrcBang` instance is replaced by
    `Outputable HsBang`. While being only GHC-internal, the only place
    it's used is in outputting `HsBangTy` constructors -- which already
    have `HsBang`. It wouldn't make sense to reconstruct a `HsSrcBang` just
    to ignore the `SourceText` anyway.
  - The error `TcRnUnexpectedAnnotation` did not use the `SourceText`,
    so it too now only holds a `HsBang`.
  

• 24757fec
  by Mauricio at 2024-07-04T11:12:59-04:00

  AST: Moved definitions that use GHC.Utils.Panic to GHC namespace
  
  Progress towards #21592
  

• 9be49379
  by Mike Pilgrem at 2024-07-04T11:13:41-04:00

  Fix #25032 Refer to Cabal's `includes` field, not `include-files`
  

• 9e2ecf14
  by Andrew Lelechenko at 2024-07-04T11:14:17-04:00

  base: fix more missing changelog entries
  

• a82121b3
  by Peter Trommler at 2024-07-04T11:14:53-04:00

  X86 NCG: Fix argument promotion in foreign C calls
  
  Promote 8 bit and 16 bit signed arguments by sign extension.
  
  Fixes #25018
  

• fab13100
  by Bryan Richter at 2024-07-04T11:15:29-04:00

  Add .gitlab/README.md with creds instructions
  

• 564981bd
  by Matthew Pickering at 2024-07-05T07:35:29-04:00

  configure: Set LD_STAGE0 appropiately when 9.10.1 is used as a boot compiler
  
  In 9.10.1 the "ld command" has been removed, so we fall back to using
  the more precise "merge objects command" when it's available as
  LD_STAGE0 is only used to set the object merging command in hadrian.
  
  Fixes #24949
  

• a949c792
  by Matthew Pickering at 2024-07-05T07:35:29-04:00

  hadrian: Don't build ghci object files for ./hadrian/ghci target
  
  There is some convoluted logic which determines whether we build ghci
  object files are not. In any case, if you set `ghcDynPrograms = pure
  False` then it forces them to be built.
  
  Given we aren't ever building executables with this flavour it's fine
  to leave `ghcDynPrograms` as the default and it should be a bit faster
  to build less.
  
  Also fixes #24949
  

• 48bd8f8e
  by Matthew Pickering at 2024-07-05T07:36:06-04:00

  hadrian: Remove STG dump from ticky_ghc flavour transformer
  
  This adds 10-15 minutes to build time, it is a better strategy to
  precisely enable dumps for the modules which show up prominently in a
  ticky profile.
  
  Given I am one of the only people regularly building ticky compilers I
  think it's worthwhile to remove these.
  
  Fixes #23635
  

• 5b1aefb7
  by Matthew Pickering at 2024-07-05T07:36:06-04:00

  hadrian: Add dump_stg flavour transformer
  
  This allows you to write `--flavour=default+ticky_ghc+dump_stg` if you
  really want STG for all modules.
  

• ab2b60b6
  by Sven Tennie at 2024-07-08T15:03:41-04:00

  AArch64: Simplify stmtToInstrs type
  
  There's no need to hand `Nothing`s around... (there was no case with a
  `BlockId`.)
  

• 71a7fa8c
  by Sven Tennie at 2024-07-08T15:03:41-04:00

  AArch64: Simplify stmtsToInstrs type
  
  The `BlockId` parameter (`bid`) is never used, only handed around.
  Deleting it simplifies the surrounding code.
  

• 8bf6fd68
  by Simon Peyton Jones at 2024-07-08T15:04:17-04:00

  Fix eta-expansion in Prep
  
  As #25033 showed, we were eta-expanding in a way that broke a join point,
  which messed up Note [CorePrep invariants].
  
  The fix is rather easy.  See Wrinkle (EA1) of
  Note [Eta expansion of arguments in CorePrep]
  

• 96acf823
  by Sjoerd Visscher at 2024-07-09T06:16:14-04:00

  One-shot Haddock
  

• 74ec4c06
  by Sjoerd Visscher at 2024-07-09T06:16:14-04:00

  Remove haddock-stdout test option
  
  Superseded by output handling of Hadrian
  

• ed8a8f0b
  by Rodrigo Mesquita at 2024-07-09T06:16:51-04:00

  ghc-boot: Relax Cabal bound
  
  Fixes #25013
  

• 3f9548fe
  by Matthew Pickering at 2024-07-09T06:17:36-04:00

  ci: Unset ALEX/HAPPY variables when testing bootstrap jobs
  
  Ticket #24826 reports a regression in 9.10.1 when building from a source
  distribution. This patch is an attempt to reproduce the issue on CI by
  more aggressively removing `alex` and `happy` from the environment.
  

• aba2c9d4
  by Andrea Bedini at 2024-07-09T06:17:36-04:00

  hadrian: Ignore build-tool-depends fields in cabal files
  
  hadrian does not utilise the build-tool-depends fields in cabal files
  and their presence can cause issues when building source distribution
  (see #24826)
  
  Ideally Cabal would support building "full" source distributions which
  would remove the need for workarounds in hadrian but for now we can
  patch the build-tool-depends out of the cabal files.
  
  Fixes #24826
  

• 12bb9e7b
  by Matthew Pickering at 2024-07-09T06:18:12-04:00

  testsuite: Don't attempt to link when checking whether a way is supported
  
  It is sufficient to check that the simple test file compiles as it will
  fail if there are not the relevant library files for the requested way.
  
  If you break a way so badly that even a simple executable fails to link
  (as I did for profiled dynamic way), it will just mean the tests for
  that way are skipped on CI rather than displayed.
  

• 46ec0a8e
  by Torsten Schmits at 2024-07-09T13:37:02+02:00

  Improve docs for NondecreasingIndentation
  
  The text stated that this affects indentation of layouts nested in do
  expressions, while it actually affects that of do layouts nested in any
  other.
  

• dddc9dff
  by Zubin Duggal at 2024-07-12T11:41:24-04:00

  compiler: Fingerprint -fwrite-if-simplified-core
  
  We need to recompile if this flag is changed because later modules might depend on the
  simplified core for this module if -fprefer-bytecode is enabled.
  
  Fixes #24656
  

• 145a6477
  by Matthew Pickering at 2024-07-12T11:42:00-04:00

  Add support for building profiled dynamic way
  
  The main payload of this change is to hadrian.
  
  * Default settings will produced dynamic profiled objects
  * `-fexternal-interpreter` is turned on in some situations when there is
    an incompatibility between host GHC and the way attempting to be
    built.
  * Very few changes actually needed to GHC
  
  There are also necessary changes to the bootstrap plans to work with the
  vendored Cabal dependency. These changes should ideally be reverted by
  the next GHC release.
  
  In hadrian support is added for building profiled dynamic libraries
  (nothing too exciting to see there)
  
  Updates hadrian to use a vendored Cabal submodule, it is important that
  we replace this usage with a released version of Cabal library before
  the 9.12 release.
  
  Fixes #21594
  
  -------------------------
  Metric Increase:
      libdir
  -------------------------
  

• 414a6950
  by Matthew Pickering at 2024-07-12T11:42:00-04:00

  testsuite: Make find_so regex more precise
  
  The hash contains lowercase [a-z0-9] and crucially not _p which meant we
  sometimes matched on `libHS.._p` profiled shared libraries rather than
  the normal shared library.
  

• dee035bf
  by Alex Mason at 2024-07-12T11:42:41-04:00

  ncg(aarch64): Add fsqrt instruction, byteSwap primitives [#24956]
  
  Implements the FSQRT machop using native assembly rather than a C call.
  
  Implements MO_BSwap by producing assembly to do the byte swapping
  instead of producing a foreign call a C function.
  
  In `tar`, the hot loop for `deserialise` got almost 4x faster by
  avoiding the foreign call which caused spilling live variables to the
  stack -- this means the loop did 4x more memory read/writing than
  necessary in that particular case!
  

• 5104ee61
  by Sylvain Henry at 2024-07-12T11:43:23-04:00

  Linker: use m32 allocator for sections when NEED_PLT (#24432)
  
  Use M32 allocator to avoid fragmentation when allocating ELF sections.
  We already did this when NEED_PLT was undefined. Failing to do this led
  to relocations impossible to fulfil (#24432).
  

• 52d66984
  by Sylvain Henry at 2024-07-12T11:43:23-04:00

  RTS: allow M32 allocation outside of 4GB range when assuming -fPIC
  

• c34fef56
  by Sylvain Henry at 2024-07-12T11:43:23-04:00

  Linker: fix stub offset
  
  Remove unjustified +8 offset that leads to memory corruption (cf
  discussion in #24432).
  

• 280e4bf5
  by Simon Peyton Jones at 2024-07-12T11:43:59-04:00

  Make type-equality on synonyms a bit faster
  
  This MR make equality fast for (S tys1 `eqType` S tys2),
  where S is a non-forgetful type synonym.
  
  It doesn't affect compile-time allocation much, but then comparison doesn't
  allocate anyway.  But it seems like a Good Thing anyway.
  
  See Note [Comparing type synonyms] in GHC.Core.TyCo.Compare
  and Note [Forgetful type synonyms] in GHC.Core.TyCon
  
  Addresses #25009.
  

• cb83c347
  by Alan Zimmerman at 2024-07-12T11:44:35-04:00

  EPA: Bring back SrcSpan in EpaDelta
  
  When processing files in ghc-exactprint, the usual workflow is to
  first normalise it with makeDeltaAst, and then operate on it.
  
  But we need the original locations to operate on it, in terms of
  finding things.
  
  So restore the original SrcSpan for reference in EpaDelta
  

• 7bcda869
  by Matthew Pickering at 2024-07-12T11:45:11-04:00

  Update alpine release job to 3.20
  
  alpine 3.20 was recently released and uses a new python and sphinx
  toolchain which could be useful to test.
  

• 43aa99b8
  by Matthew Pickering at 2024-07-12T11:45:11-04:00

  testsuite: workaround bug in python-3.12
  
  There is some unexplained change to binding behaviour in python-3.12
  which requires moving this import from the top-level into the scope of
  the function.
  
  I didn't feel any particular desire to do a deep investigation as to why
  this changed as the code works when modified like this. No one in the
  python IRC channel seemed to know what the problem was.
  

• e3914028
  by Adam Sandberg Ericsson at 2024-07-12T11:45:47-04:00

  initialise mmap_32bit_base during RTS startup #24847

• 86b8ecee
  by Hécate Kleidukos at 2024-07-12T11:46:27-04:00

  haddock: Only fetch supported languages and extensions once per Interface list
  
  This reduces the number of operations done on each Interface, because
  supported languages and extensions are determined from architecture and
  operating system of the build host. This information remains stable
  across Interfaces, and as such doesn not need to be recovered for each
  Interface.
  

• 4f85366f
  by sheaf at 2024-07-13T05:58:14-04:00

  Testsuite: use py-cpuinfo to compute CPU features
  
  This replaces the rather hacky logic we had in place for checking
  CPU features. In particular, this means that feature availability now
  works properly on Windows.
  

• 41f1354d
  by Matthew Pickering at 2024-07-13T05:58:51-04:00

  testsuite: Replace $CC with $TEST_CC
  
  The TEST_CC variable should be set based on the test compiler, which may
  be different to the compiler which is set to CC on your system (for
  example when cross compiling).
  
  Fixes #24946
  

• 572fbc44
  by sheaf at 2024-07-15T08:30:32-04:00

  isIrrefutableHsPat: consider COMPLETE pragmas
  
  This patch ensures we taken into account COMPLETE pragmas when we
  compute whether a pattern is irrefutable. In particular, if a pattern
  synonym is the sole member of a COMPLETE pragma (without a result TyCon),
  then we consider a pattern match on that pattern synonym to be irrefutable.
  
  This affects the desugaring of do blocks, as it ensures we don't use
  a "fail" operation.
  
  Fixes #15681 #16618 #22004
  

• 84dadea9
  by Zubin Duggal at 2024-07-15T08:31:09-04:00

  haddock: Handle non-hs files, so that haddock can generate documentation for modules with
  foreign imports and template haskell.
  
  Fixes #24964
  

• 0b4ff9fa
  by Zubin Duggal at 2024-07-15T12:12:30-04:00

  haddock: Keep track of warnings/deprecations from dependent packages in `InstalledInterface`
  and use this to propagate these on items re-exported from dependent packages.
  
  Fixes #25037
  

• b8b4b212
  by Zubin Duggal at 2024-07-15T12:12:30-04:00

  haddock: Keep track of instance source locations in `InstalledInterface` and use this to add
  source locations on out of package instances
  
  Fixes #24929
  

• 559a7a7c
  by Matthew Pickering at 2024-07-15T12:13:05-04:00

  ci: Refactor job_groups definition, split up by platform
  
  The groups are now split up so it's easier to see which jobs are
  generated for each platform
  
  No change in behaviour, just refactoring.
  

• 20383006
  by Matthew Pickering at 2024-07-16T11:48:25+01:00

  ci: Replace debian 10 with debian 12 on validation jobs
  
  Since debian 10 is now EOL we migrate onwards to debian 12 as the basis
  for most platform independent validation jobs.
  

• 12d3b66c
  by Matthew Pickering at 2024-07-17T13:22:37-04:00

  ghcup-metadata: Fix use of arch argument
  
  The arch argument was ignored when making the jobname, which lead to
  failures when generating metadata for the alpine_3_18-aarch64 bindist.
  
  Fixes #25089
  

• bace981e
  by Matthew Pickering at 2024-07-19T10:14:02-04:00

  testsuite: Delay querying ghc-pkg to find .so dirs until test is run
  
  The tests which relied on find_so would fail when `test` was run
  before the tree was built. This was because `find_so` was evaluated too
  eagerly.
  
  We can fix this by waiting to query the location of the libraries until
  after the compiler has built them.
  

• 478de1ab
  by Torsten Schmits at 2024-07-19T10:14:37-04:00

  Add `complete` pragmas for backwards compat patsyns `ModLocation` and `ModIface`
  
  !12347 and !12582 introduced breaking changes to these two constructors
  and mitigated that with pattern synonyms.
  

• b57792a8
  by Matthew Pickering at 2024-07-19T10:15:13-04:00

  ci: Fix ghcup-metadata generation (again)
  
  I made some mistakes in 203830065b81fe29003c1640a354f11661ffc604
  
  * Syntax error
  * The aarch-deb11 bindist doesn't exist
  
  I tested against the latest nightly pipeline locally:
  
  ```
  nix run .gitlab/generate-ci#generate-job-metadata
  nix shell -f .gitlab/rel_eng/ -c ghcup-metadata --pipeline-id 98286 --version 9.11.20240715 --fragment --date 2024-07-17 --metadata=/tmp/meta
  ```
  

• 1fa35b64
  by Andreas Klebinger at 2024-07-19T17:35:20+02:00

  Revert "Allow non-absolute values for bootstrap GHC variable"
  
  This broke configure in subtle ways resulting in #25076 where hadrian
  didn't end up the boot compiler it was configured to use.
  
  This reverts commit 209d09f52363b261b900cf042934ae1e81e2caa7.
  

• 55117e13
  by Simon Peyton Jones at 2024-07-24T02:41:12-04:00

  Fix bad bug in mkSynonymTyCon, re forgetfulness
  
  As #25094 showed, the previous tests for forgetfulness was
  plain wrong, when there was a forgetful synonym in the RHS
  of a synonym.
  

• a8362630
  by Sergey Vinokurov at 2024-07-24T12:22:45-04:00

  Define Eq1, Ord1, Show1 and Read1 instances for basic Generic representation types
  
  This way the Generically1 newtype could be used to derive Eq1 and Ord1
  for user types with DerivingVia.
  
  The CLC proposal is https://github.com/haskell/core-libraries-committee/issues/273.
  
  The GHC issue is https://gitlab.haskell.org/ghc/ghc/-/issues/24312.
  

• de5d9852
  by Simon Peyton Jones at 2024-07-24T12:23:22-04:00

  Address #25055, by disabling case-of-runRW# in Gentle phase
  
  See Note [Case-of-case and full laziness]
  in GHC.Driver.Config.Core.Opt.Simplify
  

• 3f89ab92
  by Andreas Klebinger at 2024-07-25T14:12:54+02:00

  Fix -freg-graphs for FP and AARch64 NCG (#24941).
  
  It seems we reserve 8 registers instead of four for global regs
  based on the layout in Note [AArch64 Register assignments].
  
  I'm not sure it's neccesary, but for now we just accept this state of
  affairs and simple update -fregs-graph to account for this.
  

• f6b4c1c9
  by Simon Peyton Jones at 2024-07-27T09:45:44-04:00

  Fix nasty bug in occurrence analyser
  
  As #25096 showed, the occurrence analyser was getting one-shot info
  flat out wrong.
  
  This commit does two things:
  
  * It fixes the bug and actually makes the code a bit tidier too.
    The work is done in the new function
       GHC.Core.Opt.OccurAnal.mkRhsOccEnv,
    especially the bit that prepares the `occ_one_shots` for the RHS.
  
    See Note [The OccEnv for a right hand side]
  
  * When floating out a binding we must be conservative about one-shot
    info.  But we were zapping the entire demand info, whereas we only
    really need zap the /top level/ cardinality.
  
    See Note [Floatifying demand info when floating]
    in GHC.Core.Opt.SetLevels
  
  For some reason there is a 2.2% improvement in compile-time allocation
  for CoOpt_Read.  Otherwise nickels and dimes.
  
  Metric Decrease:
      CoOpt_Read
  

• 646ee207
  by Torsten Schmits at 2024-07-27T09:46:20-04:00

  add missing cell in flavours table
  

• ec2eafdb
  by Ben Gamari at 2024-07-28T20:51:12+02:00

  users-guide: Drop mention of dead __PARALLEL_HASKELL__ macro
  
  This has not existed for over a decade.
  

• e2f2a56e
  by Arnaud Spiwack at 2024-07-28T22:21:07-04:00

  Add tests for 25081
  

• 23f50640
  by Arnaud Spiwack at 2024-07-28T22:21:07-04:00

  Scale multiplicity in list comprehension
  
  Fixes #25081
  

• d2648289
  by romes at 2024-07-30T01:38:12-04:00

  TTG HsCmdArrForm: use Fixity via extension point
  
  Also migrate Fixity from GHC.Hs to Language.Haskell.Syntax
  since it no longer uses any GHC-specific data types.
  
  Fixed arrow desugaring bug. (This was dead code before.)
  Remove mkOpFormRn, it is also dead code, only used in the arrow
  desugaring now removed.
  
  Co-authored-by: Fabian Kirchner <kirchner@posteo.de>
  Co-authored-by: Alan Zimmerman <alan.zimm@gmail.com>
  

• e258ad54
  by Matthew Pickering at 2024-07-30T01:38:48-04:00

  ghcup-metadata: More metadata fixes
  
  * Incorrect version range on the alpine bindists
  * Missing underscore in "unknown_versioning"
  
  Fixes #25119
  

• 72b54c07
  by Rodrigo Mesquita at 2024-08-01T00:47:29-04:00

  Deriving-via one-shot strict state Monad instances
  
  A small refactor to use deriving via GHC.Utils.Monad.State.Strict
  Monad instances for state Monads with unboxed/strict results which all
  re-implemented the one-shot trick in the instance and used unboxed
  tuples:
  
  * CmmOptM in GHC.Cmm.GenericOpt
  * RegM in GHC.CmmToAsm.Reg.Linear.State
  * UniqSM in GHC.Types.Unique.Supply
  

• bfe4b3d3
  by doyougnu at 2024-08-01T00:48:06-04:00

  Rts linker: add case for pc-rel 64 relocation
  
  part of the upstream haskell.nix patches
  

• 5843c7e3
  by doyougnu at 2024-08-01T00:48:42-04:00

  RTS linker: aarch64: better debug information
  
  Dump better debugging information when a symbol address is null.
  
  Part of the haskell.nix patches upstream project
  
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  

• c2e9c581
  by Rodrigo Mesquita at 2024-08-01T00:49:18-04:00

  base: Add haddocks to HasExceptionContext
  
  Fixes #25091
  

• f954f428
  by Sylvain Henry at 2024-08-01T00:49:59-04:00

  Only lookup ghcversion.h file in the RTS include-dirs by default.
  
  The code was introduced in 3549c952b535803270872adaf87262f2df0295a4.
  It used `getPackageIncludePath` which name doesn't convey that it looks
  into all include paths of the preload units too. So this behavior is
  probably unintentional and it should be ok to change it.
  
  Fix #25106
  

• 951ce3d5
  by Matthew Pickering at 2024-08-01T00:50:35-04:00

  driver: Fix -Wmissing-home-modules when multiple units have the same module name
  
  It was assumed that module names were unique but that isn't true with
  multiple units.
  
  The fix is quite simple, maintain a set of `(ModuleName, UnitId)` and
  query that to see whether the module has been specified.
  
  Fixes #25122
  

• bae1fea4
  by sheaf at 2024-08-01T00:51:15-04:00

  PMC: suggest in-scope COMPLETE sets when possible
  
  This commit modifies GHC.HsToCore.Pmc.Solver.generateInhabitingPatterns
  to prioritise reporting COMPLETE sets in which all of the ConLikes
  are in scope. This avoids suggesting out of scope constructors
  when displaying an incomplete pattern match warning, e.g. in
  
    baz :: Ordering -> Int
    baz = \case
      EQ -> 5
  
  we prefer:
  
    Patterns of type 'Ordering' not matched:
        LT
        GT
  
  over:
  
    Patterns of type 'Ordering' not matched:
        OutOfScope
  
  Fixes #25115
  

• ff158fcd
  by Tommy Bidne at 2024-08-02T01:14:32+12:00

  Print exception metadata in default handler
  
  CLC proposals 231 and 261:
  
  - Add exception type metadata to SomeException's displayException.
  - Add "Exception" header to default exception handler.
  
  See:
  
  https://github.com/haskell/core-libraries-committee/issues/231
  https://github.com/haskell/core-libraries-committee/issues/261
  
  Update stm submodule for test fixes.
  

• 8b2f70a2
  by Andrei Borzenkov at 2024-08-01T23:00:46-04:00

  Type syntax in expressions (#24159, #24572, #24226)
  
  This patch extends the grammar of expressions with syntax that is
  typically found only in types:
    * function types (a -> b), (a ->. b), (a %m -> b)
    * constrained types (ctx => t)
    * forall-quantification (forall tvs. t)
  
  The new forms are guarded behind the RequiredTypeArguments extension,
  as specified in GHC Proposal #281. Examples:
  
    {-# LANGUAGE RequiredTypeArguments #-}
    e1 = f (Int    -> String)          -- function type
    e2 = f (Int %1 -> String)          -- linear function type
    e3 = f (forall a. Bounded a => a)  -- forall type, constraint
  
  The GHC AST and the TH AST have been extended as follows:
  
     syntax        | HsExpr   | TH.Exp
    ---------------+----------+--------------
     a -> b        | HsFunArr | ConE (->)
     a %m -> b     | HsFunArr | ConE FUN
     ctx => t      | HsQual   | ConstrainedE
     forall a. t   | HsForAll | ForallE
     forall a -> t | HsForAll | ForallVisE
  
  Additionally, a new warning flag -Wview-pattern-signatures has been
  introduced to aid with migration to the new precedence of (e -> p :: t).
  
  Co-authored-by: Vladislav Zavialov <vlad.z.4096@gmail.com>
  

• 66e7f57d
  by Brandon Chinn at 2024-08-01T21:50:58-07:00

  Implement MultilineStrings (#24390)
  
  This commit adds support for multiline strings, proposed at
  https://github.com/ghc-proposals/ghc-proposals/pull/569.
  Multiline strings can now be written as:
  
      myString =
        """
        this is a
        multiline string
        """
  
  The multiline string will have leading indentation stripped away.
  Full details of this post-processing may be found at the new
  GHC.Parser.String module.
  
  In order to cleanly implement this and maximize reusability, I
  broke out the lexing logic for strings out of Lexer.x into a
  new GHC.Parser.String module, which lexes strings with any
  provided "get next character" function. This also gave us the
  opportunity to clean up this logic, and even optimize it a bit.
  With this change, parsing string literals now takes 25% less
  time and 25% less space.
  

• cf47b96f
  by Rodrigo Mesquita at 2024-08-03T05:59:40-04:00

  hi: Stable sort avails
  
  Sorting the Avails in DocStructures is required to produce fully
  deterministic interface files in presence of re-exported modules.
  
  Fixes #25104
  

• af2ae742
  by M. Taimoor Zaeem at 2024-08-03T18:52:50+05:00

  haddock: decrease margin on top of small headings
  

• a1e42e7a
  by Rodrigo Mesquita at 2024-08-05T21:03:04-04:00

  hi: Deterministic ImportedMods in Usages
  
  The `mi_usages` field of the interface files must use a deterministic
  list of `Usage`s to guarantee a deterministic interface. However, this
  list was, in its origins, constructed from a `ModuleEnv` which uses a
  non-deterministic ordering that was leaking into the interface.
  
  Specifically, ImportedMods = ModuleEnv ... would get converted to a list and
  then passed to `mkUsageInfo` to construct the Usages.
  
  The solution is simple. Back `ImportedMods` with a deterministic map.
  `Map Module ...` is enough, since the Ord instance for `Module` already
  uses a stable, deterministic, comparison.
  
  Fixes #25131
  

• eb1cb536
  by Serge S. Gulin at 2024-08-06T08:54:55+00:00

  testsuite: extend size performance tests with gzip (fixes #25046)
  
  The main purpose is to create tests for minimal app (hello world and its variations, i.e. unicode used) distribution size metric.
  
  Many platforms support distribution in compressed form via gzip. It would be nice to collect information on how much size is taken by the executional bundle for each platform at minimal edge case.
  
  2 groups of tests are added:
  1. We extend javascript backend size tests with gzip-enabled versions for all cases where an optimizing compiler is used (for now it is google closure compiler).
  2. We add trivial hello world tests with gzip-enabled versions for all other platforms at CI pipeline where no external optimizing compiler is used.
  

• d94410f8
  by Rodrigo Mesquita at 2024-08-07T11:49:19-04:00

  ghc-internal: @since for backtraceDesired
  
  Fixes point 1 in #25052
  

• bfe600f5
  by Rodrigo Mesquita at 2024-08-07T11:49:19-04:00

  ghc-internal: No trailing whitespace in exceptions
  
  Fixes #25052
  

• 62650d9f
  by Andreas Klebinger at 2024-08-07T11:49:54-04:00

  Add since annotation for -fkeep-auto-rules.
  
  This partially addresses #25082.
  

• 5f0e23fd
  by Andreas Klebinger at 2024-08-07T11:49:54-04:00

  Mention `-fkeep-auto-rules` in release notes.
  
  It was added earlier but hadn't appeared in any release notes yet.
  Partially addresses #25082.
  

• 7446a09a
  by Sylvain Henry at 2024-08-07T11:50:35-04:00

  Cmm: don't perform unsound optimizations on 32-bit compiler hosts
  
  - beef61351b240967b49169d27a9a19565cf3c4af enabled the use of
    MO_Add/MO_Sub for 64-bit operations in the C and LLVM backends
  - 6755d833af8c21bbad6585144b10e20ac4a0a1ab did the same for the x86 NCG
    backend
  
  However we store some literal values as `Int` in the compiler. As a
  result, some Cmm optimizations transformed target 64-bit literals into
  compiler `Int`. If the compiler is 32-bit, this leads to computing with
  wrong literals (see #24893 and #24700).
  
  This patch disables these Cmm optimizations for 32-bit compilers. This
  is unsatisfying (optimizations shouldn't be compiler-word-size
  dependent) but it fixes the bug and it makes the patch easy to backport.
  A proper fix would be much more invasive but it shall be implemented in
  the future.
  
  Co-authored-by: amesgen <amesgen@amesgen.de>
  

• d59faaf2
  by Vladislav Zavialov at 2024-08-07T11:51:11-04:00

  docs: Update info on RequiredTypeArguments
  
  Add a section on "types in terms" that were implemented in 8b2f70a202
  and remove the now outdated suggestion of using `type` for them.
  

• 39fd6714
  by Sylvain Henry at 2024-08-07T11:51:52-04:00

  JS: fix minor typo in base's jsbits
  

• e7764575
  by Sylvain Henry at 2024-08-07T11:51:52-04:00

  RTS: remove hack to force old cabal to build a library with only JS sources
  
  Need to extend JSC externs with Emscripten RTS definitions to avoid
  JSC_UNDEFINED_VARIABLE errors when linking without the emcc rts.
  
  Fix #25138
  
  Some recompilation avoidance tests now fail. This is tracked with the
  other instances of this failure in #23013. My hunch is that they were
  working by chance when we used the emcc linker.
  
  Metric Decrease:
      T24602_perf_size
  

• d1a40233
  by Brandon Chinn at 2024-08-07T11:53:08-04:00

  Support multiline strings in type literals (#25132)
  

• 610840eb
  by Sylvain Henry at 2024-08-07T11:53:50-04:00

  JS: fix callback documentation (#24377)
  
  Fix #24377
  

• 6ae4b76a
  by Zubin Duggal at 2024-08-13T13:36:57-04:00

  haddock: Build haddock-api and haddock-library using hadrian
  
  We build these two packages as regular boot library dependencies rather
  than using the `in-ghc-tree` flag to include the source files into the haddock
  executable.
  
  The `in-ghc-tree` flag is moved into haddock-api to ensure that haddock built
  from hackage can still find the location of the GHC bindist using `ghc-paths`.
  
  Addresses #24834
  
  This causes a metric decrease under non-release flavours because under these
  flavours libraries are compiled with optimisation but executables are not.
  
  Since we move the bulk of the code from the haddock executable to the
  haddock-api library, we see a metric decrease on the validate flavours.
  
  Metric Decrease:
      haddock.Cabal
      haddock.base
      haddock.compiler
  

• 51ffba5d
  by Arnaud Spiwack at 2024-08-13T13:37:50-04:00

  Add an extension field to HsRecFields
  
  This is the Right Thing to Do™. And it prepares for storing a
  multiplicity coercion there.
  
  First step of the plan outlined here and below
  https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12947#note_573091
  

• 4d2faeeb
  by Arnaud Spiwack at 2024-08-13T13:37:50-04:00

  Add test for #24961
  

• 623b4337
  by Arnaud Spiwack at 2024-08-13T13:37:50-04:00

  Ensures that omitted record fields in pattern have multiplicity Many
  
  Omitted fields were simply ignored in the type checker and produced
  incorrect Core code.
  
  Fixes #24961
  
  Metric Increase:
      RecordUpdPerf
  

• c749bdfd
  by Sylvain Henry at 2024-08-13T13:38:41-04:00

  AARCH64 linker: skip NONE relocations
  
  This patch is part of the patches upstreamed from haskell.nix.
  See https://github.com/input-output-hk/haskell.nix/pull/1960 for the
  original report/patch.
  

• 682a6a41
  by Brandon Chinn at 2024-08-13T13:39:17-04:00

  Support multiline strings in TH
  

• ee0a9c18
  by Matthew Pickering at 2024-08-14T14:27:39-04:00

  Extend -reexported-module flag to support module renaming
  
  The -reexported-module flag now supports renaming -rexported-modules.
  
  ```
  -rexported-module "A as B"
  ```
  
  This feature is only relevant to multi-component sessions.
  
  Fixes #25139
  

• e9496000
  by Arnaud Spiwack at 2024-08-14T14:28:20-04:00

  Don't restrict eta-reduction of linear functions
  
  This commit simply removes code. All the supporting implementation has
  been done as part of !12883.
  
  Closes #25129
  

• 2bb4156e
  by sheaf at 2024-08-14T14:28:56-04:00

  Allow @ character in C labels
  
  Generated symbol names can include the '@' character, for example when using
  `__attribute__((vectorcall))`.

• 7602ca23
  by Sylvain Henry at 2024-08-14T14:29:36-04:00

  Linker: replace blind tuple with a datatype + docs
  

• bdd77b9e
  by sheaf at 2024-08-16T12:47:11-04:00

  isIrrefutableHsPat: look up ConLikes in the HscEnv
  
  At GhcRn stage, in isIrrefutableHsPat we only looked up data constructors
  in the RdrEnv, which meant that we lacked fallibility information for
  out-of-scope constructors (which can arise from Template Haskell splices).
  
  Instead, we use 'lookupGREInfo', which looks up the information in
  the type environment. This was the correct function to call all along,
  but was not used in 572fbc44 due to import cycle reasons. The appropriate
  functions, 'irrefutableConLike{Rn,Tc}' have been moved to 'GHC.Rename.Env',
  which avoids import cycles.
  
  Fixes #25164
  

• 4bee377c
  by Sylvain Henry at 2024-08-16T12:47:53-04:00

  Linker: some refactoring to prepare for #24886
  
  - Rename LoadedBCOs into LazyBCOs
  - Bundle SptEntries with CompiledByteCode and removed [SptEntry] field
    from the BCOs constructor
  - Rename Linkable's LM constructor into Linkable: in the past we had LM
    and LP for Module and Package, now we only have the former.
  - Rename Unlinked into LinkablePart (and linkableUnlinked into
    linkableParts)
  - Use NonEmpty to encode invariant in Linkable's linkableParts type
  - Add helpers: linkableLibs, linkableBCOs, etc.
  - Add documentation
  - Remove partial nameOfObject
  - Rename nameOfObject_maybe into linkablePartPath
  - Rename byteCodeOfObject into linkablePartAllBCOs.
  - Refactor linkablePartAllBCOs to avoid a panic if a LazyBCO has a C
    stub. Document the fact that LazyBCOs are returned in this case
    (contrary to linkableBCOs which only returns non-lazy ones)
  
  Refactoring done while trying to understand how to adapt the linker code
  to support the JS backend too (cf #24886).
  

• fa0dbaca
  by Mario Blažević at 2024-08-17T03:31:32+00:00

  Implements the Exportable Named Default proposal (#24305)
  
  This squashed commit adds support for exportable named defaults, the accepted
  GHC proposal at https://github.com/ghc-proposals/ghc-proposals/pull/409
  
  The proposal extends the Haskell '98 declarations
  
      default (Int, Double)
  
  which were implicitly always applying to Num class alone, to allow specifying
  an arbitrary single-parameter class:
  
      default IsString (Text, String)
  
  The effect of this declaration would be to eliminate the ambiguous type errors
  around string literals when OverloadedStrings extension is active. The
  declaration by itself has effect only in its module, so the proposal also adds
  the ability to export class defaults:
  
      module MyModule (default IsIstring)
  
  Once the language extension is published and established, we can consider using
  it in base and other libraries.
  
  See Note [Named default declarations] in GHC.Tc.Gen.Default
  for implementation details.
  

• 1deba6b2
  by Simon Peyton Jones at 2024-08-17T13:58:13-04:00

  Make kick-out more selective
  
  This MR revised the crucial kick-out criteria in the constraint solver.
  
  Ticket #24984 showed an example in which
   * We were kicking out unnecessarily
   * That gave rise to extra work, of course
   * But it /also/ led to exponentially-sized coercions due to lack
     of sharing in coercions (something we want to fix separately #20264)
  
  This MR sharpens up the kick-out criteria; specifially in (KK2) we look
  only under type family applications if (fs>=fw).
  
  This forced me to understand the existing kick-out story, and I ended
  up rewriting many of the careful Notes in GHC.Tc.Solver.InertSet.
  Especially look at the new `Note [The KickOut Criteria]`
  
  The proof of termination is not air-tight, but it is better than before,
  and both Richard and I think it's correct :-).
  

• 88488847
  by Cheng Shao at 2024-08-18T04:44:01+02:00

  testsuite: remove undesired -fasm flag from test ways
  
  This patch removes the -fasm flag from test ways, except ways like
  optasm that explicitly state they are meant to be compiled with NCG
  backend. Most test ways should use the default codegen backend, and
  the precense of -fasm can cause stderr mismatches like this when GHC
  is configured with the unregisterised backend:
  
  ```
  --- /dev/null
  +++ /tmp/ghctest-3hydwldj/test   spaces/testsuite/tests/profiling/should_compile/prof-late-cc.run/prof-late-cc.comp.stderr.normalised
  @@ -0,0 +1,2 @@
  +when making flags consistent: warning: [GHC-74335] [-Winconsistent-flags (in -Wdefault)]
  +    Target platform uses unregisterised ABI, so compiling via C
  *** unexpected failure for prof-late-cc(prof_no_auto)
  ```
  
  This has been breaking the wasm unreg nightly job since !12595 landed.
  

• 3a145315
  by Cheng Shao at 2024-08-18T13:05:45-04:00

  ghci: fix isMinTTY.h casing for Windows targets
  
  This commit fixes isMinTTY.h casing in isMinTTY.c that's compiled for
  Windows targets. While this looks harmless given Windows filesystems
  are case-insensitive by default, it does cause a compilation warning
  with recent versions of clang, so we might as well fix the casing:
  
  ```
  driver\ghci\isMinTTY.c:10:10: error:
       warning: non-portable path to file '"isMinTTY.h"'; specified path differs in case from file name on disk [-Wnonportable-include-path]
     |
  10 | #include "isMINTTY.h"
     |          ^
  
   #include "isMINTTY.h"
           ^~~~~~~~~~~~
           "isMinTTY.h"
  1 warning generated.
  ```
  

• 5f972bfb
  by Zubin Duggal at 2024-08-21T03:18:15-04:00

  compiler: Fix pretty printing of ticked prefix constructors (#24237)
  

• ef0a08e7
  by Mike Pilgrem at 2024-08-21T03:18:57-04:00

  Fix #15773 Clarify further -rtsopts 'defaults' in docs
  

• 05a4be58
  by Sebastian Graf at 2024-08-21T03:19:33-04:00

  Improve efficiency of `assertError` (#24625)
  
  ... by moving `lazy` to the exception-throwing branch.
  It's all documented in `Note [Strictness of assertError]`.
  

• c29b2b5a
  by sheaf at 2024-08-21T13:11:30-04:00

  GHCi debugger: drop record name spaces for Ids
  
  When binding new local variables at a breakpoint, we should create
  Ids with variable namespace, and not record field namespace. Otherwise
  the rest of the compiler falls over because the IdDetails are wrong.
  
  Fixes #25109
  

• bd82ac9f
  by Hécate Kleidukos at 2024-08-21T13:12:12-04:00

  base: Final deprecation of GHC.Pack
  
  The timeline mandated by #21461 has come to its term and after two years
  and four minor releases, we are finally removing GHC.Pack from base.
  
  Closes #21536
  

• 5092dbff
  by Sylvain Henry at 2024-08-21T13:12:54-04:00

  JS: support rubbish static literals (#25177)
  
  Support for rubbish dynamic literals was added in #24664. This patch
  does the same for static literals.
  
  Fix #25177
  

• b5a2c061
  by Phil de Joux at 2024-08-21T13:13:33-04:00

  haddock docs: prefix comes before, postfix comes after
  

• 6fde3685
  by Marcin Szamotulski at 2024-08-21T23:15:39-04:00

  haddock: include package info with --show-interface
  

• 7e02111b
  by Andreas Klebinger at 2024-08-21T23:16:15-04:00

  Document the (x86) SIMD macros.
  
  Fixes #25021.
  

• 05116c83
  by Rodrigo Mesquita at 2024-08-22T10:37:44-04:00

  ghc-internal: Derive version from ghc's version
  
  Fixes #25005
  

• 73f5897d
  by Ben Gamari at 2024-08-22T10:37:44-04:00

  base: Deprecate GHC.Desugar
  
  See https://github.com/haskell/core-libraries-committee/issues/216.
  
  This will be removed in GHC 9.14.
  

• 821d0a9a
  by Cheng Shao at 2024-08-22T10:38:22-04:00

  compiler: Store ForeignStubs and foreign C files in interfaces
  
  This data is used alongside Core bindings to reconstruct intermediate
  build products when linking Template Haskell splices with bytecode.
  
  Since foreign stubs and files are generated in the pipeline, they were
  lost with only Core bindings stored in interfaces.
  
  The interface codec type `IfaceForeign` contains a simplified
  representation of `ForeignStubs` and the set of foreign sources that
  were manually added by the user.
  
  When the backend phase writes an interface, `mkFullIface` calls
  `encodeIfaceForeign` to read foreign source file contents and assemble
  `IfaceForeign`.
  
  After the recompilation status check of an upstream module,
  `initWholeCoreBindings` calls `decodeIfaceForeign` to restore
  `ForeignStubs` and write the contents of foreign sources to the file
  system as temporary files.
  The restored foreign inputs are then processed by `hscInteractive` in
  the same manner as in a regular pipeline.
  
  When linking the stub objects for splices, they are excluded from suffix
  adjustment for the interpreter way through a new flag in `Unlinked`.
  
  For details about these processes, please consult Note [Foreign stubs
  and TH bytecode linking].
  
  Metric Decrease:
      T13701
  

• f0408eeb
  by Cheng Shao at 2024-08-23T10:37:10-04:00

  git: remove a.out and include it in .gitignore
  
  a.out is a configure script byproduct. It was mistakenly checked into
  the tree in !13118. This patch removes it, and include it in
  .gitignore to prevent a similar error in the future.
  

• 1f95c5e4
  by Matthew Pickering at 2024-08-23T10:37:46-04:00

  docs: Fix code-block syntax on old sphinx version
  
  This code-block directive breaks the deb9 sphinx build.
  
  Fixes #25201
  

• 27dceb42
  by Sylvain Henry at 2024-08-26T11:05:11-04:00

  JS: add basic support for POSIX *at functions (#25190)
  
  openat/fstatat/unlinkat/dup are now used in the recent release of the
  `directory` and `file-io` packages.
  
  As such, these functions are (indirectly) used in the following tests
  one we'll bump the `directory` submodule (see !13122):
  - openFile008
  - jsOptimizer
  - T20509
  - bkpcabal02
  - bkpcabal03
  - bkpcabal04
  

• c68be356
  by Matthew Pickering at 2024-08-26T11:05:11-04:00

  Update directory submodule to latest master
  
  The primary reason for this bump is to fix the warning from `ghc-pkg
  check`:
  
  ```
  Warning: include-dirs: /data/home/ubuntu/.ghcup/ghc/9.6.2/lib/ghc-9.6.2/lib/../lib/aarch64-linux-ghc-9.6.2/directory-1.3.8.1/include doesn't exist or isn't a directory
  ```
  
  This also requires adding the `file-io` package as a boot library (which
  is discussed in #25145)
  
  Fixes #23594 #25145
  

• 4ee094d4
  by Matthew Pickering at 2024-08-26T11:05:47-04:00

  Fix aarch64-alpine target platform description
  
  We are producing bindists where the target triple is
  
  aarch64-alpine-linux
  
  when it should be
  
  aarch64-unknown-linux
  
  This is because the bootstrapped compiler originally set the target
  triple to `aarch64-alpine-linux` which is when propagated forwards by
  setting `bootstrap_target` from the bootstrap compiler target.
  
  In order to break this chain we explicitly specify build/host/target for
  aarch64-alpine.
  
  This requires a new configure flag `--enable-ignore-` which just
  switches off a validation check that the target platform of the
  bootstrap compiler is the same as the build platform. It is the same,
  but the name is just wrong.
  
  These commits can be removed when the bootstrap compiler has the correct
  target triple (I looked into patching this on ci-images, but it looked
  hard to do correctly as the build/host platform is not in the settings
  file).
  
  Fixes #25200
  

• e0e0f2b2
  by Matthew Pickering at 2024-08-26T11:05:47-04:00

  Bump nixpkgs commit for gen_ci script
  

• 63a27091
  by doyougnu at 2024-08-26T20:39:30-04:00

  rts: win32: emit additional debugging information
  
  -- migration from haskell.nix
  

• aaab3d10
  by Vladislav Zavialov at 2024-08-26T20:40:06-04:00

  Only export defaults when NamedDefaults are enabled (#25206)
  
  This is a reinterpretation of GHC Proposal #409 that avoids a breaking
  change introduced in fa0dbaca6c "Implements the Exportable Named Default proposal"
  
  Consider a module M that has no explicit export list:
  
  	module M where
  	default (Rational)
  
  Should it export the default (Rational)?
  
  The proposal says "yes", and there's a test case for that:
  
  	default/DefaultImport04.hs
  
  However, as it turns out, this change in behavior breaks existing
  programs, e.g. the colour-2.3.6 package can no longer be compiled,
  as reported in #25206.
  
  In this patch, we make implicit exports of defaults conditional on
  the NamedDefaults extension. This fix is unintrusive and compliant
  with the existing proposal text (i.e. it does not require a proposal
  amendment). Should the proposal be amended, we can go for a simpler
  solution, such as requiring all defaults to be exported explicitly.
  
  Test case: testsuite/tests/default/T25206.hs
  

• 3a5bebf8
  by Matthew Pickering at 2024-08-28T14:16:42-04:00

  simplifier: Fix space leak during demand analysis
  
  The lazy structure (a list) in a strict field in `DmdType` is not fully
  forced which leads to a very large thunk build-up.
  
  It seems there is likely still more work to be done here as it seems we
  may be trading space usage for work done. For now, this is the right
  choice as rather than using all the memory on my computer, compilation
  just takes a little bit longer.
  
  See #25196
  

• c2525e9e
  by Ryan Scott at 2024-08-28T14:17:17-04:00

  Add missing parenthesizeHsType in cvtp's InvisP case
  
  We need to ensure that when we convert an `InvisP` (invisible type pattern) to
  a `Pat`, we parenthesize it (at precedence `appPrec`) so that patterns such as
  `@(a :: k)` will parse correctly when roundtripped back through the parser.
  
  Fixes #25209.
  

• 1499764f
  by Sjoerd Visscher at 2024-08-29T16:52:56+02:00

  Haddock: Add no-compilation flag
  
  This flag makes sure to avoid recompilation of the code when generating documentation by only reading the .hi and .hie files, and throw an error if it can't find them.
  

• 768fe644
  by Andreas Klebinger at 2024-09-03T13:15:20-04:00

  Add functions to check for weakly pinned arrays.
  
  This commit adds `isByteArrayWeaklyPinned#` and `isMutableByteArrayWeaklyPinned#` primops.
  These check if a bytearray is *weakly* pinned. Which means it can still be explicitly moved
  by the user via compaction but won't be moved by the RTS.
  
  This moves us one more stop closer to nailing down #22255.
  

• b16605e7
  by Arsen Arsenović at 2024-09-03T13:16:05-04:00

  ghc-toolchain: Don't leave stranded a.outs when testing for -g0
  
  This happened because, when ghc-toolchain tests for -g0, it does so by
  compiling an empty program.  This compilation creates an a.out.
  
  Since we create a temporary directory, lets place the test program
  compilation in it also, so that it gets cleaned up.
  
  Fixes: 25b0b40467d0a12601497117c0ad14e1fcab0b74
  Closes: https://gitlab.haskell.org/ghc/ghc/-/issues/25203
  

• 83e70b14
  by Torsten Schmits at 2024-09-03T13:16:41-04:00

  Build foreign objects for TH with interpreter's way when loading from iface
  
  Fixes #25211
  
  When linking bytecode for TH from interface core bindings with
  `-fprefer-byte-code`, foreign sources are loaded from the interface as
  well and compiled to object code in an ad-hoc manner.
  
  The results are then loaded by the interpreter, whose way may differ
  from the current build's target way.
  
  This patch ensures that foreign objects are compiled with the
  interpreter's way.
  

• 0d3bc2fa
  by Cheng Shao at 2024-09-04T07:20:06-04:00

  rts: fix checkClosure error message
  
  This patch fixes an error message in checkClosure() when the closure
  has already been evacuated. The previous logic was meant to print the
  evacuated closure's type in the error message, but it was completely
  wrong, given info was not really an info table, but a tagged pointer
  that points to the closure's new address.
  

• fb0a4e5c
  by Sven Tennie at 2024-09-04T07:20:43-04:00

  MO_AcquireFence: Less restrictive barrier
  
  GCC and CLang translate the built-in `atomic_thread_fence(memory_order_acquire)`
  to `dmb ishld`, which is a bit less restrictive than `dmb ish` (which
  also implies stores.)
  

• a45f1488
  by Fendor at 2024-09-04T20:22:00-04:00

  testsuite: Add support to capture performance metrics via 'perf'
  
  Performance metrics collected via 'perf' can be more accurate for
  run-time performance than GHC's rts, due to the usage of hardware
  counters.
  
  We allow performance tests to also record PMU events according to 'perf
  list'.
  

• ce61fca5
  by Fendor at 2024-09-04T20:22:00-04:00

  gitlab-ci: Add nightly job for running the testsuite with perf profiling support
  

• 6dfb9471
  by Fendor at 2024-09-04T20:22:00-04:00

  Enable perf profiling for compiler performance tests
  

• da306610
  by sheaf at 2024-09-04T20:22:41-04:00

  RecordCon lookup: don't allow a TyCon
  
  This commit adds extra logic when looking up a record constructor.
  If GHC.Rename.Env.lookupOccRnConstr returns a TyCon (as it may, due to
  the logic explained in Note [Pattern to type (P2T) conversion]),
  we emit an error saying that the data constructor is not in scope.
  
  This avoids the compiler falling over shortly thereafter, in the call to
  'lookupConstructorInfo' inside 'GHC.Rename.Env.lookupRecFieldOcc',
  because the record constructor would not have been a ConLike.
  
  Fixes #25056
  

• 9c354beb
  by Matthew Pickering at 2024-09-04T20:23:16-04:00

  Use deterministic names for temporary files
  
  When there are multiple threads they can race to create a temporary
  file, in some situations the thread will create ghc_1.c and in some it
  will create ghc_2.c. This filename ends up in the debug info for object
  files after compiling a C file, therefore contributes to object
  nondeterminism.
  
  In order to fix this we store a prefix in `TmpFs` which serves to
  namespace temporary files. The prefix is populated from the counter in
  TmpFs when the TmpFs is forked. Therefore the TmpFs must be forked
  outside the thread which consumes it, in a deterministic order, so each
  thread always receives a TmpFs with the same prefix.
  
  This assumes that after the initial TmpFs is created, all other TmpFs
  are created from forking the original TmpFs. Which should have been try
  anyway as otherwise there would be file collisions and non-determinism.
  
  Fixes #25224
  

• 59906975
  by Hécate Kleidukos at 2024-09-05T10:57:15-04:00

  Silence x-partial in Haddock.Backends.Xhtml
  
  This is an unfortunate consequence of two mechanisms:
    * GHC provides (possibly-empty) lists of names
    * The functions that retrieve those names are not equipped to do error
      reporting, and thus accept these lists at face value. They will have
      to be attached an effect for error reporting in a later refactoring
  

• 8afbab62
  by Hécate Kleidukos at 2024-09-05T10:57:15-04:00

  hadrian: Support loading haddock in ghci
  
  There is one tricky aspect with wired-in packages where the boot package
  is built with `-this-unit-id ghc` but the dependency is reported as
  `-package-id ghc-9.6...`. This has never been fixed in GHC as the
  situation of loading wired-in packages into the multi-repl seems like
  quite a niche feature that is always just easier to workaround.
  

• 6cac9eb8
  by Matthew Pickering at 2024-09-05T10:57:15-04:00

  hadrian/multi: Load all targets when ./hadrian/ghci-multi is called
  
  This seems to make a bit more sense than just loading `ghc` component
  (and dependencies).
  

• 7d84df86
  by Matthew Pickering at 2024-09-05T10:57:51-04:00

  ci: Beef up determinism interface test
  
  There have recently been some determinism issues with the simplifier and
  documentation. We enable more things to test in the ABI test to check
  that we produce interface files deterministically.
  

• 5456e02e
  by Sylvain Henry at 2024-09-06T11:57:01+02:00

  Transform some StgRhsClosure into StgRhsCon after unarisation (#25166)
  
  Before unarisation we may have code like:
  
    Test.foo :: Test.D
    [GblId, Unf=OtherCon []] =
        \u []
            case (# |_| #) [GHC.Types.(##)] of sat_sAw [Occ=Once1] {
            __DEFAULT -> Test.D [GHC.Types.True sat_sAw];
            };
  
  After unarisation we get:
  
    Test.foo :: Test.D
    [GblId, Unf=OtherCon []] =
        {} \u [] Test.D [GHC.Types.True 2#];
  
  Notice that it's still an Updatable closure for no reason anymore. This
  patch transforms appropriate StgRhsClosures into StgRhsCons after
  unarisation, allowing these closures to be statically allocated. Now we
  get the expected:
  
    Test.foo :: Test.D
    [GblId, Unf=OtherCon []] =
        Test.D! [GHC.Types.True 2#];
  
  Fix #25166
  
  To avoid duplicating code, this patch refactors the mk(Top)StgRhs
  functions and put them in a GHC.Stg.Make module alongside the new
  mk(Top)StgRhsCon_maybe functions.
  

• 958b4518
  by Hécate Kleidukos at 2024-09-06T16:40:56-04:00

  haddock: Add missing requirements.txt for the online manual
  

• 573f9833
  by Sven Tennie at 2024-09-08T09:58:21+00:00

  AArch64: Implement takeRegRegMoveInstr
  
  This has likely been forgotten.
  

• 20b0de7d
  by Hécate Kleidukos at 2024-09-08T14:19:28-04:00

  haddock: Configuration fix for ReadTheDocs
  

• 03055c71
  by Sylvain Henry at 2024-09-09T14:58:15-04:00

  JS: fake support for native adjustors (#25159)
  
  The JS backend doesn't support adjustors (I believe) and in any case if
  it ever supports them it will be a native support, not one via libffi.
  

• 5bf0e6bc
  by Sylvain Henry at 2024-09-09T14:58:56-04:00

  JS: remove redundant h$lstat
  
  It was introduced a second time by mistake in
  27dceb42376c34b99a38e36a33b2abc346ed390f (cf #25190)
  

• ffbc2ab0
  by Simon Peyton Jones at 2024-09-10T00:40:37-04:00

  Refactor only newSysLocalDs
  
  * Change newSysLocalDs to take a scaled type
  * Add newSysLocalMDs that takes a type and makes a ManyTy local
  
  Lots of files touched, nothing deep.
  

• 7124e4ad
  by Simon Peyton Jones at 2024-09-10T00:40:37-04:00

  Don't introduce 'nospec' on the LHS of a RULE
  
  This patch address #25160.  The main payload is:
  
  * When desugaring the LHS of a RULE, do not introduce the `nospec` call
    for non-canonical evidence.  See GHC.Core.InstEnv
    Note [Coherence and specialisation: overview]
  
    The `nospec` call usually introdued in `dsHsWrapper`, but we don't want it
    on the LHS of a RULE (that's what caused #25160).  So now `dsHsWrapper` takes
    a flag to say if it's on the LHS of a RULE.  See wrinkle (NC1) in
    `Note [Desugaring non-canonical evidence]` in GHC.HsToCore.Binds.
  
  But I think this flag will go away again when I have finished with my
  (entirely separate) speciaise-on-values patch (#24359).
  
  All this meant I had to re-understand the `nospec` stuff and coherence, and
  that in turn made me do some refactoring, and add a lot of new documentation
  
  The big change is that in GHC.Core.InstEnv, I changed
    the /type synonym/ `Canonical` into
    a /data type/ `CanonicalEvidence`
  and documented it a lot better.
  
  That in turn made me realise that CalLStacks were being treated with a
  bit of a hack, which I documented in `Note [CallStack and ExecptionContext hack]`.
  

• 663daf8d
  by Simon Peyton Jones at 2024-09-10T00:40:37-04:00

  Add defaulting of equalities
  
  This MR adds one new defaulting strategy to the top-level
  defaulting story: see Note [Defaulting equalities] in GHC.Tc.Solver.
  
  This resolves #25029 and #25125, which showed that users were
  accidentally relying on a GHC bug, which was fixed by
  
      commit 04f5bb85c8109843b9ac2af2a3e26544d05e02f4
      Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
      Date:   Wed Jun 12 17:44:59 2024 +0100
  
      Fix untouchability test
  
      This MR fixes #24938.  The underlying problem was tha the test for
      "does this implication bring in scope any equalities" was plain wrong.
  
  This fix gave rise to a number of user complaints; but the improved
  defaulting story of this MR largely resolves them.
  
  On the way I did a bit of refactoring, of course
  
  * Completely restructure the extremely messy top-level defaulting
    code. The new code is in GHC.Tc.Solver.tryDefaulting, and is much,
    much, much esaier to grok.
  

• e28cd021
  by Andrzej Rybczak at 2024-09-10T00:41:18-04:00

  Don't name a binding pattern
  
  It's a keyword when PatternSynonyms are set.
  

• b09571e2
  by Simon Peyton Jones at 2024-09-10T00:41:54-04:00

  Do not use an error thunk for an absent dictionary
  
  In worker/wrapper we were using an error thunk for an absent dictionary,
  but that works very badly for -XDictsStrict, or even (as #24934 showed)
  in some complicated cases involving strictness analysis and unfoldings.
  
  This MR just uses RubbishLit for dictionaries. Simple.
  
  No test case, sadly because our only repro case is rather complicated.
  

• 8bc9f5f6
  by Hécate Kleidukos at 2024-09-10T00:42:34-04:00

  haddock: Remove support for applehelp format in the Manual
  

• 9ca15506
  by doyougnu at 2024-09-10T10:46:38-04:00

  RTS linker: add support for hidden symbols (#25191)
  
  Add linker support for hidden symbols. We basically treat them as weak
  symbols.
  
  Patch upstreamed from haskell.nix
  
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  Co-authored-by: Moritz Angermann <moritz.angermann@gmail.com>
  

• 3b2dc826
  by Sven Tennie at 2024-09-10T10:47:14-04:00

  Fix C warnings (#25237)
  
  GCC 14 treats the fixed warnings as errors by default. I.e. we're
  gaining GCC 14 compatibility with these fixes.
  

• 05715994
  by Sylvain Henry at 2024-09-10T10:47:55-04:00

  JS: fix codegen of static string data
  
  Before this patch, when string literals are made trivial, we would
  generate `h$("foo")` instead of `h$str("foo")`. This was
  introduced by mistake in 6bd850e887b82c5a28bdacf5870d3dc2fc0f5091.
  

• 949ebced
  by Hécate Kleidukos at 2024-09-10T19:19:40-04:00

  haddock: Re-organise cross-OS compatibility layer
  

• 84ac9a99
  by Hécate Kleidukos at 2024-09-10T19:19:40-04:00

  haddock: Remove CPP for obsolete GHC and Cabal versions
  

• 370d1599
  by Hécate Kleidukos at 2024-09-10T19:19:40-04:00

  haddock: Move the changelog file to the 'extra-doc-files' section in the cabal file
  

• cfbff65a
  by Simon Peyton Jones at 2024-09-10T19:20:16-04:00

  Add ZonkAny and document it
  
  This MR fixed #24817 by adding ZonkAny, which takes a Nat
  argument.
  
  See Note [Any types] in GHC.Builtin.Types, especially
  wrinkle (Any4).
  

• 0167e472
  by Matthew Pickering at 2024-09-11T02:41:42-04:00

  hadrian: Make sure ffi headers are built before using a compiler
  
  When we are using ffi adjustors then we rely on `ffi.h` and
  `ffitarget.h` files during code generation when compiling stubs.
  
  Therefore we need to add this dependency to the build system (which this
  patch does).
  
  Reproducer, configure with `--enable-libffi-adjustors` and then build
  "_build/stage1/libraries/ghc-prim/build/GHC/Types.p_o".
  
  Observe that this fails before this patch and works afterwards.
  
  Fixes #24864
  
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  

• 0f696958
  by Rodrigo Mesquita at 2024-09-11T02:42:18-04:00

  base: Deprecate BCO primops exports from GHC.Exts
  
  See https://github.com/haskell/core-libraries-committee/issues/212.
  
  These reexports will be removed in GHC 9.14.
  

• cf0e7729
  by Alan Zimmerman at 2024-09-11T02:42:54-04:00

  EPA: Remove Anchor = EpaLocation synonym
  
  This just causes confusion.
  

• 8e462f4d
  by Andrew Lelechenko at 2024-09-11T22:20:37-04:00

  Bump submodule deepseq to 1.5.1.0
  

• aa4500ae
  by Sebastian Graf at 2024-09-11T22:21:13-04:00

  User's guide: Fix the "no-backtracking" example of -XOrPatterns (#25250)
  
  Fixes #25250.
  

• 1c479c01
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: Add Native Code Generator (NCG)
  
  This architecture wasn't supported before.
  
  Co-authored-by: Moritz Angermann <moritz.angermann@gmail.com>
  

• 51b678e1
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  Adjust test timings for slower computers
  
  Increase the delays a bit to be able to run these tests on slower
  computers.
  
  The reference was a Lichee Pi 4a RISCV64 machine.
  

• a0e41741
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: Add RTS linker
  
  This architecture wasn't supported before.
  
  Co-authored-by: Moritz Angermann <moritz.angermann@gmail.com>
  

• d365b1d4
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: Ignore divbyzero test
  
  The architecture's behaviour differs from the test's expectations. See
  comment in code why this is okay.
  

• abf3d699
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: Enable MulMayOflo_full test
  
  It works and thus can be tested.
  

• 38c7ea8c
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: LibffiAdjustor: Ensure code caches are flushed
  
  RISCV64 needs a specific code flushing sequence (involving fence.i) when
  new code is created/loaded.
  

• 7edc6965
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: Add additional linker symbols for builtins
  
  We're relying on some GCC/Clang builtins. These need to be visible to
  the linker (and not be stripped away.)
  

• 92ad3d42
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: Add GHCi support
  
  As we got a RTS linker for this architecture now, we can enable GHCi for
  it.
  

• a145f701
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  RISCV64: Set codeowners of the NCG
  

• 8e6d58cf
  by Sven Tennie at 2024-09-12T10:39:38+00:00

  Add test for C calling convention
  
  Ensure that parameters and return values are correctly processed. A
  dedicated test (like this) helps to get the subtleties of calling
  conventions easily right.
  
  The test is failing for WASM32 and marked as fragile to not forget to
  investigate this (#25249).
  

• fff55592
  by Torsten Schmits at 2024-09-12T21:50:34-04:00

  finder: Add `IsBootInterface` to finder cache keys
  

• cdf530df
  by Alan Zimmerman at 2024-09-12T21:51:10-04:00

  EPA: Sync ghc-exactprint to GHC
  

• 1374349b
  by Sebastian Graf at 2024-09-13T07:52:11-04:00

  DmdAnal: Fast path for `multDmdType` (#25196)
  
  This is in order to counter a regression exposed by SpecConstr.
  
  Fixes #25196.
  

• 80769bc9
  by Andrew Lelechenko at 2024-09-13T07:52:47-04:00

  Bump submodule array to 0.5.8.0
  

• 49ac3fb8
  by Sylvain Henry at 2024-09-16T10:33:01-04:00

  Linker: add support for extra built-in symbols (#25155)
  
  See added Note [Extra RTS symbols] and new user guide entry.
  
  Co-authored-by: Hamish Mackenzie <Hamish.K.Mackenzie@gmail.com>
  Co-authored-by: Moritz Angermann <moritz.angermann@gmail.com>
  

• 3939a8bf
  by Samuel Thibault at 2024-09-16T10:33:44-04:00

  GNU/Hurd: Add getExecutablePath support
  
  GNU/Hurd exposes it as /proc/self/exe just like on Linux.
  

• d3b19851
  by Sylvain Henry at 2024-09-17T11:03:28-04:00

  RTS: expose closure_sizeW_ (#25252)
  
  C code using the closure_sizeW macro can't be linked with the RTS linker
  without this patch. It fails with:
  
    ghc-9.11.20240911: Failed to lookup symbol: closure_sizeW_
  
  Fix #25252
  
  Co-authored-by: Hamish Mackenzie <Hamish.K.Mackenzie@gmail.com>
  Co-authored-by: Moritz Angermann <moritz.angermann@gmail.com>
  

• 137bf74d
  by Sebastian Graf at 2024-09-17T11:04:05-04:00

  HsExpr: Inline `HsWrap` into `WrapExpr`
  
  This nice refactoring was suggested by Simon during review:
  https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13261#note_583374
  
  Fixes #25264.
  

• 7fd9e5e2
  by Sebastian Graf at 2024-09-17T11:04:05-04:00

  Pmc: Improve Desugaring of overloaded list patterns (#25257)
  
  This actually makes things simpler.
  
  Fixes #25257.
  

• e4169ba9
  by Ben Gamari at 2024-09-18T07:55:28-04:00

  configure: Correctly report when subsections-via-symbols is disabled
  
  As noted in #24962, currently subsections-via-symbols is disabled on
  AArch64/Darwin due to alleged breakage. However, `configure` reports to
  the user that it is enabled. Fix this.
  

• 9d20a787
  by Mario Blažević at 2024-09-18T07:56:08-04:00

  Modified the default export implementation to match the amended spec
  

• 35eb4f42
  by Sylvain Henry at 2024-09-18T07:57:00-04:00

  FFI: don't ppr Id/Var symbols with debug info (#25255)
  
  Even if `-dpp-debug` is enabled we should still generate valid C code.
  So we disable debug info printing when rendering with Code style.
  

• 9e96dad8
  by Sebastian Graf at 2024-09-21T17:47:59-04:00

  Demand: Combine examples into Note (#25107)
  
  Just a leftover from !13060.
  
  Fixes #25107.
  

• 21aaa34b
  by sheaf at 2024-09-21T17:48:36-04:00

  Use x86_64-unknown-windows-gnu target for LLVM on Windows
  

• 992a7624
  by sheaf at 2024-09-21T17:48:36-04:00

  LLVM: use -relocation-model=pic on Windows
  
  This is necessary to avoid the segfaults reported in #22487.
  
  Fixes #22487
  

• c50d29be
  by Ryan Hendrickson at 2024-09-21T17:49:15-04:00

  compiler: Use type abstractions when deriving
  
  For deriving newtype and deriving via, in order to bring type variables
  needed for the coercions into scope, GHC generates type signatures for
  derived class methods. As a simplification, drop the type signatures and
  instead use type abstractions to bring method type variables into scope.
  

• f04fd0ae
  by Zubin Duggal at 2024-09-21T17:49:51-04:00

  driver: Ensure we run driverPlugin for staticPlugins (#25217)
  
  driverPlugins are only run when the plugin state changes. This meant they were
  never run for static plugins, as their state never changes.
  
  We need to keep track of whether a static plugin has been initialised to ensure
  we run static driver plugins at least once. This necessitates an additional field
  in the `StaticPlugin` constructor as this state has to be bundled with the plugin
  itself, as static plugins have no name/identifier we can use to otherwise reference
  them
  

• 620becd7
  by Andreas Klebinger at 2024-09-21T17:50:27-04:00

  Allow unknown fd device types for setNonBlockingMode.
  
  This allows fds with a unknown device type to have blocking mode
  set. This happens for example for fds from the inotify subsystem.
  
  Fixes #25199.
  

• c76e25b3
  by Hécate Kleidukos at 2024-09-21T17:51:07-04:00

  Use Hackage version of Cabal 3.14.0.0 for Hadrian.
  We remove the vendored Cabal submodule.
  
  Also update the bootstrap plans
  
  Fixes #25086
  

• 6c83fd7f
  by Zubin Duggal at 2024-09-21T17:51:07-04:00

  ci: Ensure we source ci.sh in any jobs that run commands outside of ci.sh
  
  ci.sh sets up the toolchain environment, including paths for the cabal directory, the
  toolchain binaries etc. If we run any commands outside of ci.sh, unless we
  source ci.sh we will use the wrong values for these environment variables.
  
  In particular, I ran into an issue where the cabal invocation `hadrian/ghci` was
  using an old index state despite `ci.sh setup` updating and setting the correct
  index state. This is because `ci.sh` sets the `CABAL_DIR` to a different place, which
  is where the index was downloaded to, but we were using the default cabal directory
  outside ci.sh
  
  The solution is to source the correct environment `ci.sh` using `. ci.sh setup`
  

• 9586998d
  by Sven Tennie at 2024-09-21T17:51:43-04:00

  ghc-toolchain: Set -fuse-ld even for ld.bfd
  
  This reflects the behaviour of the autoconf scripts.
  

• d7016e0d
  by Sylvain Henry at 2024-09-21T17:52:24-04:00

  Parser: be more careful when lexing extended literals (#25258)
  
  Previously we would lex invalid prefixes like "8#Int3" as [8#Int, 3].
  
  A side-effect of this patch is that we now allow negative unsigned
  extended literals. They trigger an overflow warning later anyway.
  

• ca67d7cb
  by Zubin Duggal at 2024-09-22T02:34:06-04:00

  rts: Ensure we dump new Cost Centres added by freshly loaded objects to the eventlog.
  
  To do this, we keep track of the ID of the last cost centre we dumped in DUMPED_CC_ID,
  and call dumpCostCentresToEventLog from refreshProfilingCCSs, which will dump all the new
  cost centres up to the one we already dumped in DUMPED_CC_ID.
  
  Fixes #24148
  

• c0df5aa9
  by Alan Zimmerman at 2024-09-22T02:34:42-04:00

  EPA: Replace AnnsModule am_main with EpTokens
  
  Working towards removing `AddEpAnn`
  

• 2a551cd5
  by Matthew Pickering at 2024-09-24T16:33:50+05:30

  ci: Run abi-test on test-abi label
  

• ab4039ac
  by Rodrigo Mesquita at 2024-09-24T16:33:50+05:30

  testsuite: Add a test for object determinism
  
  Extends the abi_test with an object determinism check
  Also includes a standalone test to be run by developers manually when
  debugging issues with determinism.
  

• d62c18d8
  by Rodrigo Mesquita at 2024-09-24T16:33:50+05:30

  determinism: Sampling uniques in the CG
  
  To achieve object determinism, the passes processing Cmm and the rest of
  the code generation pipeline musn't create new uniques which are
  non-deterministic.
  
  This commit changes occurrences of non-deterministic unique sampling
  within these code generation passes by a deterministic unique sampling
  strategy by propagating and threading through a deterministic
  incrementing counter in them. The threading is done implicitly with
  `UniqDSM` and `UniqDSMT`.
  
  Secondly, the `DUniqSupply` used to run a `UniqDSM` must be threaded
  through all passes to guarantee uniques in different passes are unique
  amongst them altogether. Specifically, the same `DUniqSupply` must be
  threaded through the CG Streaming pipeline, starting with Driver.Main
  calling `StgToCmm.codeGen`, `cmmPipeline`, `cmmToRawCmm`, and
  `codeOutput` in sequence.
  
  To thread resources through the `Stream` abstraction, we use the `UniqDSMT`
  transformer on top of `IO` as the Monad underlying the Stream. `UniqDSMT` will
  thread the `DUniqSupply` through every pass applied to the `Stream`, for every
  element. We use @type CgStream = Stream (UniqDSMT IO)@ for the Stream used in
  code generation which that carries through the deterministic unique supply.
  
  See Note [Deterministic Uniques in the CG]
  

• 3bbe4af4
  by Rodrigo Mesquita at 2024-09-24T16:33:50+05:30

  determinism: Cmm unique renaming pass
  
  To achieve object determinism, we need to prevent the non-deterministic
  uniques from leaking into the object code. We can do this by
  deterministically renaming the non-external uniques in the Cmm groups
  that are yielded right after StgToCmm.
  
  The key to deterministic renaming is observing that the order of
  declarations, instructions, and data in the Cmm groups are already
  deterministic (modulo other determinism bugs), regardless of the
  uniques. We traverse the Cmm AST in this deterministic order and
  rename the uniques, incrementally, in the order they are found, thus
  making them deterministic. This renaming is guarded by
  -fobject-determinism which is disabled by default for now.
  
  This is one of the key passes for object determinism. Read about the
  overview of object determinism and a more detailed explanation of this
  pass in:
  * Note [Object determinism]
  * Note [Renaming uniques deterministically]
  
  Significantly closes the gap to #12935
  

• 8357ed50
  by Rodrigo Mesquita at 2024-09-24T16:33:50+05:30

  determinism: DCmmGroup vs CmmGroup
  
  Part of our strategy in producing deterministic objects, namely,
  renaming all Cmm uniques in order, depend on the object code produced
  having a deterministic order (say, A_closure always comes before
  B_closure).
  
  However, the use of LabelMaps in the Cmm representation invalidated this
  requirement because the LabelMaps elements would already be in a
  non-deterministic order (due to the original uniques), and the renaming
  in sequence wouldn't work because of that non-deterministic order.
  
  Therefore, we now start off with lists in CmmGroup (which preserve the
  original order), and convert them into LabelMaps (for performance in the
  code generator) after the uniques of the list elements have been
  renamed.
  
  See Note [DCmmGroup vs CmmGroup or: Deterministic Info Tables] and #12935.
  
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  

• 0e675fb8
  by Rodrigo Mesquita at 2024-09-24T16:33:50+05:30

  determinism: Don't print unique in pprFullName
  
  This unique was leaking as part of the profiling description in info
  tables when profiling was enabled, despite not providing information
  relevant to the profile.
  

• 340f58b0
  by Rodrigo Mesquita at 2024-09-24T16:33:50+05:30

  determinism: UDFM for distinct-constructor-tables
  
  In order to produce deterministic objects when compiling with
  -distinct-constructor-tables, we also have to update the data
  constructor map to be backed by a deterministic unique map (UDFM) rather
  than a non-deterministic one (UniqMap).
  

• 282f37a0
  by Rodrigo Mesquita at 2024-09-24T16:33:50+05:30

  determinism: InfoTableMap uniques in generateCgIPEStub
  
  Fixes object determinism when using -finfo-table-map
  
  Make sure to also deterministically rename the IPE map (as per Note
  [Renaming uniques deterministically]), and to use a deterministic unique
  supply when creating new labels for the IPE information to guarantee
  deterministic objects when IPE information is requested.
  
  Note that the Cmm group produced in generateCgIPEStub must /not/ be
  renamed because renaming uniques is not idempotent, and the references
  to the previously renamed code in the IPE Cmm group would be renamed
  twice and become invalid references to non-existent symbols.
  
  We do need to det-rename the InfoTableMap that is created in the
  conversion from Core to Stg. This is not a problem since that map won't
  refer any already renamed names (since it was created before the
  renaming).
  

• 7b37afc9
  by Zubin Duggal at 2024-09-24T16:33:50+05:30

  ci: Allow abi-test to fail.
  
  We are not fully deterministic yet, see #12935 for work that remains to be done.
  

• a63ee33a
  by Simon Peyton Jones at 2024-09-25T17:08:24-04:00

  Add Given injectivity for built-in type families
  
  Ticket #24845 asks (reasonably enough) that if we have
     [G] a+b ~ 0
  then we also know
     [G] a ~ 0, b ~ 0
  and similar injectivity-like facts for other built-in type
  families.  The status quo was that we never generate evidence for
  injectivity among Givens -- but it is quite reasonnable to do so.
  All we need is to have /evidence/ for the new constraints
  
  This MR implements that goal.  I also took the opportunity to
  * Address #24978: refactoring UnivCo
  * Fix #25248, which was a consequences of the previous formulation of UnivCo
  
  As a result this MR touches a lot of code.  The big things are:
  
  * Coercion constructor UnivCo now takes a [Coercion] as argument to
    express the coercions on which the UnivCo depends. A nice consequence
    is that UnivCoProvenance now has no free variables, simpler in a number
    of places.
  
  * Coercion constructors AxiomInstCo and AxiomRuleCo are combined into
    AxiomCo.  The new AxiomCo, carries a (slightly oddly named)
    CoAxiomRule, which itself is a sum type of the various forms of
    built-in axiom.  See Note [CoAxiomRule] in GHC.Core.Coercion.Axiom
  
    A merit of this is that we can separate the case of open and closed
    type families, and eliminate the redundant `BranchIndex` in the former
    case.
  
  * Much better representation for data BuiltInSynFamily, which means we
    no longer need to enumerate built-in axioms as well as built-in tycons.
  
  * There is a massive refactor in GHC.Builtin.Types.Literals, which contains all
    the built-in axioms for type-level operations (arithmetic, append, cons etc).
  
    A big change is that instead of redundantly having (a) a hand-written
    matcher, and (b) a template-based "proves" function, which were hard to
    keep in sync, the two are derive from one set of human-supplied info.
    See GHC.Builtin.Types.Literals.mkRewriteAxiom, and friends.
  
  * Significant changes in GHC.Tc.Solver.Equality to account for the new
    opportunity for Given/Given equalities.
  
  Smaller things
  
  * Improve pretty-printing to avoid parens around atomic coercions.
  
  * Do proper eqType in findMatchingIrreds, not `eqTypeNoKindCheck`.
    Looks like a bug, Richard agrees.
  
  * coercionLKind and coercionRKind are hot functions.  I refactored the
    implementation (which I had to change anyway) to increase sharing.
    See Note [coercionKind performance] in GHC.Core.Coercion
  
  * I wrote a new Note [Finding orphan names] in GHC.Core.FVs about orphan
    names
  
  * I improved the `is_concrete` flag in GHC.Core.Type.buildSynTyCon, to avoid
    calling tyConsOfType.  I forget exactly why I did this, but it's definitely
    better now.
  
  * I moved some code from GHC.Tc.Types.Constraint into GHC.Tc.Types.CtLocEnv
    and I renamed the module GHC.Tc.Types.CtLocEnv to GHC.Tc.Types.CtLoc
  

• dd8ef342
  by Ryan Scott at 2024-09-25T17:09:01-04:00

  Resolve ambiguous method-bound type variables in vanilla defaults and GND
  
  When defining an instance of a class with a "vanilla" default, such as in the
  following example (from #14266):
  
  ```hs
  class A t where
    f :: forall x m. Monoid x => t m -> m
    f = <blah>
  
  instance A []
  ```
  
  We have to reckon with the fact that the type of `x` (bound by the type
  signature for the `f` method) is ambiguous. If we don't deal with the ambiguity
  somehow, then when we generate the following code:
  
  ```hs
  instance A [] where
    f = $dmf @[] -- NB: the type of `x` is still ambiguous
  ```
  
  Then the generated code will not typecheck. (Issue #25148 is a more recent
  example of the same problem.)
  
  To fix this, we bind the type variables from the method's original type
  signature using `TypeAbstractions` and instantiate `$dmf` with them using
  `TypeApplications`:
  
  ```hs
  instance A [] where
    f @x @m = $dmf @[] @x @m -- `x` is no longer ambiguous
  ```
  
  Note that we only do this for vanilla defaults and not for generic defaults
  (i.e., defaults using `DefaultSignatures`). For the full details, see `Note
  [Default methods in instances] (Wrinkle: Ambiguous types from vanilla method
  type signatures)`.
  
  The same problem arose in the code generated by `GeneralizedNewtypeDeriving`,
  as we also fix it here using the same technique. This time, we can take
  advantage of the fact that `GeneralizedNewtypeDeriving`-generated code
  _already_ brings method-bound type variables into scope via `TypeAbstractions`
  (after !13190), so it is very straightforward to visibly apply the type
  variables on the right-hand sides of equations. See `Note [GND and ambiguity]`.
  
  Fixes #14266. Fixes #25148.
  

• 0a4da5d2
  by ARATA Mizuki at 2024-09-25T17:09:41-04:00

  Document primitive string literals and desugaring of string literals
  
  Fixes #17474 and #17974
  
  Co-authored-by: Matthew Craven <5086-clyring@users.noreply.gitlab.haskell.org>
  

• ad0731ad
  by Zubin Duggal at 2024-09-25T17:10:18-04:00

  rts: Fix segfault when using non-moving GC with profiling
  
  `nonMovingCollect()` swaps out the `static_flag` value used as a
  sentinel for `gct->scavenged_static_objects`, but the subsequent call
  `resetStaticObjectForProfiling()` sees the old value of `static_flag` used as
  the sentinel and segfaults. So we must call `resetStaticObjectForProfiling()`
  before calling `nonMovingCollect()` as otherwise it looks for the incorrect
  sentinel value
  
  Fixes #25232 and #23958
  
  Also teach the testsuite driver about nonmoving profiling ways
  and stop disabling metric collection when nonmoving GC is enabled.
  

• e7a26d7a
  by Sylvain Henry at 2024-09-25T17:11:00-04:00

  Fix interaction between fork and kqueue (#24672)
  
  A kqueue file descriptor isn't inherited by a child created with fork.
  As such we mustn't try to close this file descriptor as we would close a
  random one, e.g. the one used by timerfd.
  
  Fix #24672
  

• 6863503c
  by Simon Peyton Jones at 2024-09-25T17:11:37-04:00

  Improve GHC.Tc.Solver.defaultEquality
  
  This MR improves GHC.Tc.Solver.defaultEquality to solve #25251.
  
  The main change is to use checkTyEqRhs to check the equality, so
  that we do promotion properly.
  
  But within that we needed a small enhancement to LC_Promote.  See
  Note [Defaulting equalites] (DE4) and (DE5)
  
  The tricky case is (alas) hard to trigger, so I have not added a
  regression test.
  

• 97a6c6c3
  by Sylvain Henry at 2024-09-25T17:12:18-04:00

  JS: fix h$withCStringOnHeap helper (#25288)
  
  strlen returns the length of the string without the \0 terminating byte,
  hence CString weren't properly allocated on the heap (ending \0 byte was
  missing).
  

• 5f7c20bc
  by Ben Gamari at 2024-09-26T04:14:05-04:00

  base: Propagate `error` CallStack to thrown exception
  
  Previously `errorCallWithCallStackException` failed to propagate its
  `CallStack` argument, which represents the call-chain of the preceding
  `error` call, to the exception that it returned. Consequently, the
  call-stack of `error` calls were quite useless.
  
  Unfortunately, this is the second time that I have fixed this but it
  seems the first must have been lost in rebasing.
  
  Fixes a bug in the implementation of CLC proposal 164
  <https://github.com/haskell/core-libraries-committee/issues/164>
  
  Fixes #24807.
  

• c20d5186
  by Matthew Pickering at 2024-09-26T04:14:42-04:00

  driver: Fix -working-dir for foreign files
  
  -working-dir definitely needs more serious testing, there are some easy
  ways to test this.
  
  * Modify Cabal to call ghc using -working-dir rather than changing
    directory.
  * Modify the testsuite to run ghc using `-working-dir` rather than
    running GHC with cwd = temporary directory.
  
  However this will have to wait until after 9.12.
  
  Fixes #25150
  

• 88eaa7ac
  by Sylvain Henry at 2024-09-26T04:15:24-04:00

  Enum deriving: reuse predError, succError, toEnumError
  
  Reuse predError, succError, and toEnumError when deriving Enum instances
  to avoid generating different error strings per instance. E.g. before
  this patch for every instance for a type FOO we would generate a string:
  
    "pred{FOO}: tried to take `pred' of first tag in enumeration"#
  

• e9fa1163
  by Sylvain Henry at 2024-09-26T04:15:24-04:00

  Enum deriving: generate better code (#16364)
  
  Generate better code for Enum.toEnum: check both the lower and the upper
  bounds at once with an unsigned comparison.
  
  Initially I've used a type ascription with a call to 'fromIntegral',
  hence the slight refactoring of nlAscribe. Using 'fromIntegral' was
  problematic (too low in the module hierarchy) so 'enumIntToWord' was
  introduced instead.
  
  Combined with the previous commit, T21839c ghc/alloc decrease by 5%
  
  Metric Decrease:
      T21839c
  

• 383af074
  by Sylvain Henry at 2024-09-26T04:16:06-04:00

  Core: add absorb rules for binary or/and (#16351)
  
  Rules:
    x or (x and y) ==> x
    x and (x or y) ==> x
  

• 783c8b29
  by Matthew Pickering at 2024-09-26T12:07:44-04:00

  Don't compile `asBox` with -fprof-late
  
  The `asBox` function is intended to store exactly the closure which the
  user passes to it. Placing a cost centre on asBox introduces a thunk,
  which violates this expectation and can change the result of using asBox
  when profiling is enabled.
  
  See #25212 for more details and ample opportunity to discuss if this is
  a bug or not.
  

• 0967dcc7
  by Matthew Pickering at 2024-09-26T12:07:44-04:00

  Fix normalisation of .prof files
  
  Fix 1: If a cost centre contained CAF then the normalisation was
  corrupted, now only check if CAF is at the start of a line.
  
  Fix 2: "no location info" contain a space, which messed up the next
  normalisation logic which assumed that columns didn't have spaced in.
  

• 9eda1cb9
  by Matthew Pickering at 2024-09-26T12:07:44-04:00

  testsuite: Fix normalisation of prof_files removing newlines
  
  These normalisation steps were collapsing lines together, which made
  subsequent normalisation steps fail.
  
  ```
  foo x y z
  CAF x y z
  qux x y z
  ```
  
  was getting normalised to
  
  ```
  foo x y z qux x y z
  ```
  
  which means that subsequent line based filters would not work correctly.
  

• 2b25f9e2
  by Matthew Pickering at 2024-09-26T12:07:44-04:00

  packaging: Enable late-ccs for release flavour
  
  This enables late cost centres when building profiled libraries and
  subsequently greatly improves the resolution of cost centre stacks when
  profiling.
  
  This patch also introduces the `grep_prof` test modifier which is used
  to apply a further filter to the .prof file before they are compared.
  
  Fixes #21732
  
  -------------------------
  Metric Increase:
      libdir
  -------------------------
  

• bb030d0d
  by Brandon Chinn at 2024-09-26T12:08:21-04:00

  Replace manual string lexing (#25158)
  
  Metric Increase:
      MultilineStringsPerf
  
  This commit replaces the manual string lexing logic with native Alex
  lexing syntax. This aligns the lexer much closer to the Haskell Report,
  making it easier to see how the implementation and spec relate. This
  slightly increases memory usage when compiling multiline strings because
  we now have two distinct phases: lexing the multiline string with Alex
  and post-processing the string afterwards. Before, these were done at
  the same time, but separating them allows us to push as much logic into
  normal Alex lexing as possible.
  
  Since multiline strings are a new feature, this regression shouldn't be
  too noticeable. We can optimize this over time.
  

• 16742987
  by Matthew Pickering at 2024-09-26T12:08:57-04:00

  Revert !4655: Stop 'import "base" Prelude' removing implicit Prelude import
  
  This behaviour is problematic for the principle reason that `import
  Prelude` may not refer to the `base` package, and in which case
  importing an entirely unrelated module causing your implicit prelude to
  leave the scope is extremely surprising. See the added test for this
  example. Discussion on #17045.
  
  The secondary reason for reverting this patch is that "base" can't be a
  wired in package any more (see #24903), so we have to remove special
  logic which singles out base from the compiler.
  
  The rule for implicit shadowing is now simply:
  
  * If you write import Prelude (..) then you don't get an implicit prelude import
  * If you write import "foobar" Prelude (..) for all pkgs foobar,
    you get an implicit import of prelude.
  
  If you want to write a package import of Prelude, then you can enable
  `NoImplicitPrelude` for the module in question to recover the behaviour
  of ghc-9.2-9.10.
  
  Fixes #17045
  

• 57c50f41
  by Matthew Pickering at 2024-09-26T12:08:57-04:00

  Rename COMPILING_BASE_PACKAGE to COMPILING_GHC_INTERNAL_PACKAGE
  
  The COMPILING_BASE_PACKAGE macro is concerned with issues defining
  symbols and using symbols in the same compilation unit. However, these
  symbols now exist in ghc-internal rather than base, so we should rename
  the macro accordingly.
  
  The code is guards is likely never used as we never produce windows DLLs
  but it is simpler to just perform the renaming for now.
  
  These days there is little doubt that this macro defined in this ad-hoc
  manner would be permitted to exist, but these days are not those days.
  
  Fixes #25221
  

• 70764243
  by Matthew Pickering at 2024-09-26T12:08:57-04:00

  Preload ghc-internal rather than base
  
  This occurence of baseUnitId was missed when moving the bulk of internal
  definitions into `ghc-internal`.
  
  We need to remove this preloading of `base` now because `base` should
  not be wired in.
  
  Towards #24903
  

• 12915609
  by Matthew Pickering at 2024-09-26T12:08:57-04:00

  Remove Data.List compat warning
  
  There is currently a warning implemented in -Wcompat which warns you
  when importing Data.List in a non-qualified manner.
  
  ```
  A.hs:3:8: warning: [-Wcompat-unqualified-imports]
      To ensure compatibility with future core libraries changes
      imports to Data.List should be
      either qualified or have an explicit import list.
    |
  3 | import Data.List
    |        ^^^^^^^^^
  Ok, one module loaded.
  ```
  
  GHC ticket: https://gitlab.haskell.org/ghc/ghc/-/issues/17244
  CLC discussion: https://groups.google.com/g/haskell-core-libraries/c/q3zHLmzBa5E
  
  This warning was implemented as part of the migration to making
  Data.List monomorphic again (and to be used like Data.Set, Data.Map
  etc). That doesn't seem like it happened, and I imagine that the current
  CLC would require a new proposal anyway in order to do that now. It's
  not clear in any case what "future core libraries changes" we are
  waiting to happen before this warning can be removed.
  
  Given the first phase of the proposal has lasted 5 years it doesn't seem
  that anyone is motivated to carry the proposal to completion. It does
  seem a bit unnecessary to include a warning in the compiler about
  "future changes to the module" when there's no timeline or volunteer to
  implement these changes.
  
  The removal of this warning was discussed again at:
  https://github.com/haskell/core-libraries-committee/issues/269
  
  During the discussion there was no new enthusiasm to move onto the next
  stages of the proposal so we are removing the warning to unblock the
  reinstallable "base" project (#24903)
  
  Fixes #24904
  

• d4e4d498
  by Matthew Pickering at 2024-09-26T12:08:57-04:00

  Move Control.Monad.Zip into ghc-internal
  
  mzip is wired in and therefore needs to be in ghc-internal.
  
  Fixes #25222
  
  Towards #24903
  

• d3dacdfb
  by Matthew Pickering at 2024-09-26T12:08:57-04:00

  Unwire the base package
  
  This patch just removes all the functions related to wiring-in the base
  package and the `-this-unit-id=base` flag from the cabal file.
  
  After this commit "base" becomes just like any other package and the
  door is opened to moving base into an external repo and releasing base
  on a separate schedule to the rest of ghc.
  
  Closes #24903
  

• 1b39363b
  by Patrick at 2024-09-27T06:10:19-04:00

  Add entity information to HieFile #24544
  
  Enhanced HieFile to capture entity information for identifiers, enabling better support for language tools and protocols. See issue #24544 for more details.
  
  Work have been done:
  * Introduction of new data type `EntityInfo` in `GHC.Iface.Ext.Types`.
  * Add extra field `hie_entity_infos :: NameEntityInfo` to `HieFile`
    to store the mapping from entity name to corresponding entity infos
    in `GHC.Iface.Ext.Types`.
  * Compute `EntityInfo` for each entity name in the HieAst from `TyThing,
    Id, OccName` when generating the `HieFile` in `GHC.Iface.Ext.Ast`.
  * Add test T24544 to test the generation of `EntityInfo`.
  

• 4f3618d8
  by sheaf at 2024-09-27T06:10:57-04:00

  The X86 SIMD patch.
  
  This commit adds support for 128 bit wide SIMD vectors and vector
  operations to GHC's X86 native code generator.
  
  Main changes:
  
    - Introduction of vector formats (`GHC.CmmToAsm.Format`)
    - Introduction of 128-bit virtual register (`GHC.Platform.Reg`),
      and removal of unused Float virtual register.
    - Refactor of `GHC.Platform.Reg.Class.RegClass`: it now only contains
      two classes, `RcInteger` (for general purpose registers) and `RcFloatOrVector`
      (for registers that can be used for scalar floating point values as well
      as vectors).
    - Modify `GHC.CmmToAsm.X86.Instr.regUsageOfInstr` to keep track
      of which format each register is used at, so that the register
      allocator can know if it needs to spill the entire vector register
      or just the lower 64 bits.
    - Modify spill/load/reg-2-reg code to account for vector registers
      (`GHC.CmmToAsm.X86.Instr.{mkSpillInstr, mkLoadInstr, mkRegRegMoveInstr, takeRegRegMoveInstr}`).
    - Modify the register allocator code (`GHC.CmmToAsm.Reg.*`) to propagate
      the format we are storing in any given register, for instance changing
      `Reg` to `RegFormat` or `GlobalReg` to `GlobalRegUse`.
    - Add logic to lower vector `MachOp`s to X86 assembly
      (see `GHC.CmmToAsm.X86.CodeGen`)
    - Minor cleanups to genprimopcode, to remove the llvm_only attribute
      which is no longer applicable.
  
  Tests for this feature are provided in the "testsuite/tests/simd" directory.
  
  Fixes #7741
  
  Keeping track of register formats adds a small memory overhead to the
  register allocator (in particular, regUsageOfInstr now allocates more
  to keep track of the `Format` each register is used at). This explains
  the following metric increases.
  
  -------------------------
  Metric Increase:
      T12707
      T13035
      T13379
      T3294
      T4801
      T5321FD
      T5321Fun
      T783
  -------------------------
  

• 10e431ef
  by sheaf at 2024-09-27T06:10:57-04:00

  Use xmm registers in genapply
  
  This commit updates genapply to use xmm, ymm and zmm registers, for
  stg_ap_v16/stg_ap_v32/stg_ap_v64, respectively.
  
  It also updates the Cmm lexer and parser to produce Cmm vectors rather
  than 128/256/512 bit wide scalars for V16/V32/V64, removing bits128,
  bits256 and bits512 in favour of vectors.
  
  The Cmm Lint check is weakened for vectors, as (in practice, e.g. on X86)
  it is okay to use a single vector register to hold multiple different
  types of data, and we don't know just from seeing e.g. "XMM1" how to
  interpret the 128 bits of data within.
  
  Fixes #25062
  

• 8238fb2d
  by sheaf at 2024-09-27T06:10:57-04:00

  Add vector fused multiply-add operations
  
  This commit adds fused multiply add operations such as `fmaddDoubleX2#`.
  These are handled both in the X86 NCG and the LLVM backends.
  

• 2cb7b748
  by sheaf at 2024-09-27T06:10:57-04:00

  Add vector shuffle primops
  
  This adds vector shuffle primops, such as
  
  ```
  shuffleFloatX4# :: FloatX4# -> FloatX4# -> (# Int#, Int#, Int#, Int# #) -> FloatX4#
  ```
  
  which shuffle the components of the input two vectors into the output vector.
  
  NB: the indices must be compile time literals, to match the X86 SHUFPD
  instruction immediate and the LLVM shufflevector instruction.
  
  These are handled in the X86 NCG and the LLVM backend.
  
  Tested in simd009.
  

• 0d2428d6
  by sheaf at 2024-09-27T06:10:57-04:00

  Add Broadcast MachOps
  
  This adds proper MachOps for broadcast instructions, allowing us to
  produce better code for broadcasting a value than simply packing that
  value (doing many vector insertions in a row).
  
  These are lowered in the X86 NCG and LLVM backends. In the LLVM backend,
  it uses the previously introduced shuffle instructions.
  

• e6c19a41
  by sheaf at 2024-09-27T06:10:57-04:00

  Fix treatment of signed zero in vector negation
  
  This commit fixes the handling of signed zero in floating-point vector
  negation.
  
  A slight hack was introduced to work around the fact that Cmm doesn't
  currently have a notion of signed floating point literals
  (see get_float_broadcast_value_reg). This can be removed once CmmFloat
  can express the value -0.0.
  
  The simd006 test has been updated to use a stricter notion of equality
  of floating-point values, which ensure the validity of this change.
  

• f496ff7f
  by sheaf at 2024-09-27T06:10:57-04:00

  Add min/max primops
  
  This commit adds min/max primops, such as
  
    minDouble# :: Double# -> Double# -> Double#
    minFloatX4# :: FloatX4# -> FloatX4# -> FloatX4#
    minWord16X8# :: Word16X8# -> Word16X8# -> Word16X8#
  
  These are supported in:
    - the X86, AArch64 and PowerPC NCGs,
    - the LLVM backend,
    - the WebAssembly and JavaScript backends.
  
  Fixes #25120
  

• 5dd2a423
  by sheaf at 2024-09-27T06:10:57-04:00

  Add test for C calls & SIMD vectors
  

• f824e1ee
  by sheaf at 2024-09-27T06:10:58-04:00

  Add test for #25169
  

• d54db7f3
  by sheaf at 2024-09-27T06:10:58-04:00

  Fix #25169 using Plan A from the ticket
  
  We now compile certain low-level Cmm functions in the RTS multiple
  times, with different levels of vector support. We then dispatch
  at runtime in the RTS, based on what instructions are supported.
  
  See Note [realArgRegsCover] in GHC.Cmm.CallConv.
  
  Fixes #25169
  
  -------------------------
  Metric Increase:
      T10421
      T12425
      T18730
      T1969
      T9198
  -------------------------
  

• d5f8778a
  by sheaf at 2024-09-27T06:10:58-04:00

  Fix C calls with SIMD vectors
  
  This commit fixes the code generation for C calls, to take into account
  the calling convention.
  
  This is particularly tricky on Windows, where all vectors are expected
  to be passed by reference. See Note [The Windows X64 C calling convention]
  in GHC.CmmToAsm.X86.CodeGen.
  

• f64bd564
  by sheaf at 2024-09-27T06:10:58-04:00

  X86 CodeGen: refactor getRegister CmmLit
  
  This refactors the code dealing with loading literals into registers,
  removing duplication and putting all the code in a single place.
  It also changes which XOR instruction is used to place a zero value
  into a register, so that we use VPXOR for a 128-bit integer vector
  when AVX is supported.
  

• ab12de6b
  by sheaf at 2024-09-27T06:10:58-04:00

  X86 genCCall: promote arg before calling evalArgs
  
  The job of evalArgs is to ensure each argument is put into a temporary
  register, so that it can then be loaded directly into one of the
  argument registers for the C call, without the generated code clobbering
  any other register used for argument passing.
  
  However, if we promote arguments after calling evalArgs, there is the
  possibility that the code used for the promotion will clobber a register,
  defeating the work of evalArgs.
  To avoid this, we first promote arguments, and only then call evalArgs.
  

• 8fd12429
  by sheaf at 2024-09-27T06:10:58-04:00

  X86 genCCall64: simplify loadArg code
  
  This commit simplifies the argument loading code by making the
  assumption that it is safe to directly load the argument into register,
  because doing so will not clobber any previous assignments.
  
  This assumption is borne from the use of 'evalArgs', which evaluates
  any arguments which might necessitate non-trivial code generation into
  separate temporary registers.
  

• 12504a9f
  by sheaf at 2024-09-27T06:10:58-04:00

  LLVM: propagate GlobalRegUse information
  
  This commit ensures we keep track of how any particular global register
  is being used in the LLVM backend. This informs the LLVM type
  annotations, and avoids type mismatches of the following form:
  
    argument is not of expected type '<2 x double>'
      call ccc <2 x double> (<2 x double>)
        (<4 x i32> arg)
  

• 2bb1e8df
  by Cheng Shao at 2024-09-27T06:11:35-04:00

  Link bytecode from interface-stored core bindings in oneshot mode
  
  !13042
  
  Part of #T25090
  
  If the flag `-fprefer-byte-code` is given when compiling a module
  containing TH, GHC will use Core bindings stored in interfaces to
  compile and link bytecode for splices.
  
  This was only implemented for `--make` mode initially, so this commit
  adds the same mechanism to oneshot mode (`-c`).
  
  When an interface is loaded into the EPS in `loadInterface` that has
  dehydrated Core bindings, an entry is added to the new field
  `eps_iface_bytecode`, containing an IO action that produces a bytecode
  `Linkable`, lazily processing the `mi_extra_decls` by calling
  `loadIfaceByteCode`.
  
  When Template Haskell dependencies are resolved in `getLinkDeps`, this
  action is looked up after loading a module's interface.
  If it exists, the action is evaluated and the bytecode is added to the
  set of `Linkable`s used for execution of the splice; otherwise it falls
  back on the traditional object file.
  
  Metric Decrease:
      MultiLayerModules
      T13701
  

• 7cb7172e
  by Matthew Pickering at 2024-09-27T06:12:12-04:00

  ci: Fix variable inheritence for ghcup-metadata testing job
  
  Downstream in ghcup-ci we use the CONFIGURE_ARGS variable to determine
  how to setup all the different jobs.
  
  On the downstream trigger this was being inherited from the default
  setting in .gitlab.yml file.
  
  Therefore this led to job failures as the necessary CONFIGURE_ARGS were
  not being passed to the configure script when installing the bindist.
  
  See docs:
  
  * https://docs.gitlab.com/ee/ci/yaml/#inherit
  * https://docs.gitlab.com/ee/ci/yaml/#triggerforward
  
  1. inherit:variables:fals
    - This stops the global variables being inherited into the job and
      hence forwarded onto the downstream job.
  
  2. trigger:forward:*
    - yaml_variables: true (default) pass yaml variables to downstream,
      this is important to pass the upstream pipeline id to downstream.
    - pipeline_variables: false (default) but don't pass pipeline
      variables (normal environment variables).
  
  Fixes #25294
  

• 9ffd6163
  by Leo at 2024-09-27T16:26:01+05:30

  Fix typo in Prelude doc for (>>=)
  
  Fix a minor typo ("equivialent" instead of "equivalent") in the documentation for (>>=) in the prelude.
  

• 5745dbd3
  by Vladislav Zavialov at 2024-09-27T16:26:52+05:30

  Wildcard binders in type declarations (#23501)
  
  Add support for wildcard binders in type declarations:
  
  	type Const a b = a   -- BEFORE: the `b` had to be named
  	                     --         even if unused on the RHS
  
  	type Const a _ = a   -- AFTER: the compiler accepts
  	                     --        a wildcard binder `_`
  
  The new feature is part of GHC Proposal #425 "Invisible binders
  in type declarations", and more specifically its amendment #641.
  
  Just like a named binder, a wildcard binder `_` may be:
  
  	* plain:      _
  	* kinded:    (_ :: k -> Type)
  	* invisible, plain:  @_
  	* invisible, kinded: @(_ :: k -> Type)
  
  Those new forms of binders are allowed to occur on the LHSs of
  data, newtype, type, class, and type/data family declarations:
  
  	data D _ = ...
  	newtype N _ = ...
  	type T _ = ...
  	class C _ where ...
  	type family F _
  	data family DF _
  
  (Test case: testsuite/tests/typecheck/should_compile/T23501a.hs)
  
  However, we choose to reject them in forall telescopes and
  type family result variable binders (the latter being part
  of the TypeFamilyDependencies extension):
  
  	type family Fd a = _    -- disallowed  (WildcardBndrInTyFamResultVar)
  	fn :: forall _. Int     -- disallowed  (WildcardBndrInForallTelescope)
  
  (Test case: testsuite/tests/rename/should_fail/T23501_fail.hs)
  
  See the new Notes:
  	* Note [Type variable binders]
  	* Note [Wildcard binders in disallowed contexts]
  
  To accommodate the new forms of binders, HsTyVarBndr was changed
  as follows (demonstrated without x-fields for clarity)
  
  	-- BEFORE (ignoring x-fields and locations)
  	data HsTyVarBndr flag
  	  = UserTyVar   flag Name
  	  | KindedTyVar flag Name HsKind
  
  	-- AFTER (ignoring x-fields and locations)
  	data HsTyVarBndr flag = HsTvb flag HsBndrVar HsBndrKind
  	data HsBndrVar  = HsBndrVar Name | HsBndrWildCard
  	data HsBndrKind = HsBndrNoKind | HsBndrKind LHsKind
  
  The rest of the patch is downstream from this change.
  
  To avoid a breaking change to the TH AST, we generate fresh
  names to replace wildcard binders instead of adding a dedicated
  representation for them (as discussed in #641).
  
  And to put a cherry on top of the cake, we now allow wildcards in
  kind-polymorphic type variable binders in constructor patterns,
  see Note [Type patterns: binders and unifiers] and the tyPatToBndr
  function in GHC.Tc.Gen.HsType; example:
  
  	fn (MkT @(_ :: forall k. k -> Type) _ _) = ...
  
  (Test case: testsuite/tests/typecheck/should_compile/T23501b.hs)
  

• ff2bdca2
  by Matthew Pickering at 2024-09-27T16:27:08+05:30

  ci: Push perf notes from wasm jobs
  
  It was observed in #25299 that we were failing to push performance
  numbers from the wasm jobs.
  
  In future we might want to remove this ad-hoc check but for now it's
  easier to add another special case.
  
  Towards #25299
  

• 4c76f75c
  by Zubin Duggal at 2024-09-27T16:44:00+05:30

  Bump GHC version to 9.12
  

• e4ac1b0d
  by Zubin Duggal at 2024-09-27T19:12:24+05:30

  Bump GHC version to 9.13
  

• da20cac1
  by Andreas Klebinger at 2024-10-02T22:18:48-04:00

  SpecConstr: Introduce a separate argument limit for forced specs.
  
  We used to put no limit at all on specializations forced via the SPEC
  argument. This isn't always reasonable so we introduce a very high limit
  that applies to forced specializations, a flag to control it, and we now
  emit a warning if we fail a specialization because we exceed the
  warning.
  
  Fixes #25197
  

• 39497eed
  by Andreas Klebinger at 2024-10-02T22:19:24-04:00

  ghc-experimental: Expose primops and ghc extensions via GHC.PrimOps
  
  This will be the new place for functions that would have gone into
  GHC.Exts in the past but are not stable enough to do so now.
  
  Addresses #25242
  

• e9dc2690
  by Sylvain Henry at 2024-10-02T22:20:06-04:00

  RTS: cleanup timerfd file descriptors after a fork (#25280)
  
  When we init a timerfd-based ticker, we should be careful to cleanup the
  old file descriptors (e.g. after a fork).
  

• 64e876bc
  by Rodrigo Mesquita at 2024-10-02T22:20:43-04:00

  determinism: Deterministic MonadGetUnique LlvmM
  
  Update LlvmM to thread a unique deterministic supply (using UniqDSMT),
  and use it in the MonadGetUnique instance.
  
  This makes uniques sampled from LlvmM deterministic, which guarantees
  object determinism with -fllvm.
  
  Fixes #25274
  

• 36bbb167
  by Matthew Pickering at 2024-10-02T22:21:18-04:00

  Bump LLVM upper bound to allow LLVM 19
  
  Also bumps the ci-images commit so that the deb12 images uses LLVM 19
  for testing.
  
  -------------------------
  Metric Decrease:
      size_hello_artifact_gzip
      size_hello_unicode_gzip
  -------------------------
  
  Fixes #25295
  

• 0029ca91
  by Matthew Pickering at 2024-10-02T22:21:54-04:00

  configure: Allow happy-2.0.2
  
  happy-2.0.2 can be used to compile GHC.
  
  happy-2.0 and 2.0.1 have bugs which make it unsuitable to use.
  
  The version bound is now == 1.20.* || >= 2.0.2 && < 2.1
  
  Fixes #25276
  

• 92976985
  by ARATA Mizuki at 2024-10-02T22:22:35-04:00

  Use bundled llc/opt on Windows (#22438)
  

• af59749a
  by Matthew Pickering at 2024-10-02T22:23:11-04:00

  Fix registerArch for riscv64
  
  The register allocator doesn't support vector registers on riscv64,
  therefore advertise as NoVectors.
  
  Fixes #25314
  

• a49e66fc
  by Matthew Pickering at 2024-10-02T22:23:11-04:00

  riscv: Avoid using csrr instruction to test for vector registers
  
  The csrr instruction isn't allowed in qemu user-mode, and raises an
  illegal instruction error when it is encountered.
  
  Therefore for now, we just hard-code that there is no support for vector
  registers since the rest of the compiler doesn't support vector
  registers for riscv.
  
  Fixes #25312
  

• 115a30e9
  by Andreas Klebinger at 2024-10-02T22:23:11-04:00

  Add support for fp min/max to riscv
  
  Fixes #25313
  

• f28b5992
  by Ben Gamari at 2024-10-02T22:23:47-04:00

  testsuite/perf: Report better error message on malformed note
  
  Previously a malformed perf note resulted in very poor errors.
  Here we slight improve this situation.
  

• 51377508
  by Ben Gamari at 2024-10-02T22:23:47-04:00

  testsuite: Handle division-by-zero more gracefully
  
  Previously we would fail with an ZeroDivisionError.
  
  Fixes #25321
  

• 50490075
  by Matthew Pickering at 2024-10-03T05:55:13-04:00

  ci: Add nightly & release ubuntu-22.04 jobs
  
  This adds build of bindists on ubuntu-22.04 on nightly and release
  pipelines.
  
  We also update ghcup-metadata to provide ubuntu-22.04 bindists on
  ubuntu-22.04.
  
  Fixes #25317
  

• 9cf1cef5
  by Zubin Duggal at 2024-10-03T05:55:49-04:00

  haddock: Bump binary interface version to 46.
  
  This allows haddock to give good error messages when being used on mismatched interface files.
  
  We bump to 46 since GHC 9.12 uses version 45: https://gitlab.haskell.org/ghc/ghc/-/commit/362afd632032ee8f174690c3ffe0015076b83ce6
  
  This should have been done in e4ac1b0d281b85a0144d1ef6f84a1df00e236052 but was overlooked.
  

• 2293c0b7
  by Andreas Klebinger at 2024-10-03T05:56:25-04:00

  Change versionig of ghc-experimental to follow ghc versions.
  
  Just like ghc-internal it will now use the @ProjectVersionForLib@ macro for versioning.
  This means for ghc=9.10.1, ghc-experimental's version will be 9.1001.0 and so on.
  
  This fixes #25289
  

• 876d6e0e
  by Ben Gamari at 2024-10-04T15:07:53+01:00

  base: Add `HasCallStack` constraint to `ioError`
  
  As proposed in core-libraries-committee#275.
  

• 9bfd9fd0
  by Matthew Pickering at 2024-10-04T15:08:03+01:00

  Fix toException method for ExceptionWithContext
  
  Fixes #25235
  

• ac004028
  by Matthew Pickering at 2024-10-04T15:09:07+01:00

  Exception rethrowing
  
  Basic changes:
  
  * Change `catch` function to propagate exceptions using the
    WhileHandling mechanism.
  * Introduce `catchNoPropagate`, which does the same as before, but
    passes an exception which can be rethrown.
  * Introduce `rethrowIO` combinator, which rethrows an exception with a
    context and doesn't add a new backtrace.
  * Introduce `tryWithContext` for a variant of `try` which can rethrow
    the exception with it's original context.
  * onException is modified to rethrow the original error rather than
    creating a new callstack.
  * Functions which rethrow in GHC.Internal.IO.Handle.FD,
    GHC.Internal.IO.Handle.Internals, GHC.Internal.IO.Handle.Text, and
    GHC.Internal.System.IO.Error are modified to not add a new callstack.
  
  Implements CLC proposal#202 <https://github.com/haskell/core-libraries-committee/issues/202>
  

• bcb293f2
  by Cheng Shao at 2024-10-04T17:59:28-04:00

  testsuite: remove accidentally checked in debug print logic
  

• 68e2da5a
  by Rodrigo Mesquita at 2024-10-05T10:36:15-04:00

  Deprecation for WarnCompatUnqualifiedImports
  
  Fixes #25330
  

• 4327f0e8
  by Andrew Lelechenko at 2024-10-05T10:36:52-04:00

  Restrict Data.List.NonEmpty.unzip to NonEmpty (a, b) -> (NonEmpty a, NonEmpty b)
  
  Implementing the final phase of CLC proposal https://github.com/haskell/core-libraries-committee/issues/86
  

• ceca9efb
  by Cheng Shao at 2024-10-06T02:18:31+00:00

  driver: fix runWorkerLimit on wasm
  
  This commit fixes link-time unresolved symbol errors for sem_open etc
  on wasm, by making runWorkerLimit always behave single-threaded. This
  avoids introducing the jobserver logic into the final wasm module and
  thus avoids referencing the posix semaphore symbols.
  

• 135fd1ac
  by Torsten Schmits at 2024-10-06T02:18:31+00:00

  Parallelize getRootSummary computations in dep analysis downsweep
  
  This reuses the upsweep step's infrastructure to process batches of
  modules in parallel.
  
  I benchmarked this by running `ghc -M` on two sets of 10,000 modules;
  one with a linear dependency chain and the other with a binary tree.
  Comparing different values for the number of modules per thread
  suggested an optimum at `length targets `div` (n_cap * 2)`, with results
  similar to this one (6 cores, 12 threads):
  
  ```
  Benchmark 1: linear 1 jobs
    Time (mean ± σ):      1.775 s ±  0.026 s    [User: 1.377 s, System: 0.399 s]
    Range (min … max):    1.757 s …  1.793 s    2 runs
  
  Benchmark 2: linear 6 jobs
    Time (mean ± σ):     876.2 ms ±  20.9 ms    [User: 1833.2 ms, System: 518.6 ms]
    Range (min … max):   856.2 ms … 898.0 ms    3 runs
  
  Benchmark 3: linear 12 jobs
    Time (mean ± σ):     793.5 ms ±  23.2 ms    [User: 2318.9 ms, System: 718.6 ms]
    Range (min … max):   771.9 ms … 818.0 ms    3 runs
  ```
  
  Results don't differ much when the batch size is reduced to a quarter
  of that, but there's significant thread scheduling overhead for a size
  of 1:
  
  ```
  Benchmark 1: linear 1 jobs
    Time (mean ± σ):      2.611 s ±  0.029 s    [User: 2.851 s, System: 0.783 s]
    Range (min … max):    2.591 s …  2.632 s    2 runs
  
  Benchmark 2: linear 6 jobs
    Time (mean ± σ):      1.189 s ±  0.007 s    [User: 2.707 s, System: 1.103 s]
    Range (min … max):    1.184 s …  1.194 s    2 runs
  
  Benchmark 3: linear 12 jobs
    Time (mean ± σ):      1.097 s ±  0.006 s    [User: 2.938 s, System: 1.300 s]
    Range (min … max):    1.093 s …  1.101 s    2 runs
  ```
  
  Larger batches also slightly worsen performance.
  

• 535a2117
  by Daniel Díaz at 2024-10-06T09:51:46-04:00

  Clarify the meaning of "exactly once" in LinearTypes
  
  Solves documentaion issue #25084.
  

• 92f8939a
  by Krzysztof Gogolewski at 2024-10-06T09:52:22-04:00

  Only allow (a => b) :: Constraint rather than CONSTRAINT rep
  
  Fixes #25243
  

• 4a2f0f13
  by Alan Zimmerman at 2024-10-07T05:16:54-04:00

  EPA: Remove unused hsCaseAnnsRest
  
  We never populate it, so remove it.
  

• 5099057b
  by John Paul Adrian Glaubitz at 2024-10-07T05:17:40-04:00

  rts: Fix invocation of __ieee_set_fp_control() on alpha-linux
  
  Fixes the following error when building GHC on alpha-linux:
  
  rts/posix/Signals.c: In function ‘initDefaultHandlers’:
  
  rts/posix/Signals.c:709:5: error:
       error: implicit declaration of function ‘ieee_set_fp_control’ [-Wimplicit-function-declaration]
        709 |     ieee_set_fp_control(0);
            |     ^~~~~~~~~~~~~~~~~~~
      |
  709 |     ieee_set_fp_control(0);
      |
  

• c9590ba0
  by Teo Camarasu at 2024-10-07T05:18:17-04:00

  Add changelog entries for !12479
  

• bf9c9566
  by Matthew Pickering at 2024-10-07T13:19:30-04:00

  javascript: Read fields of ObjectBlock lazily
  
  When linking a module with a large dependency footprint too much of the
  object files were forced during linking. This lead to a large amount of
  memory taken up by thunks which would never be forced
  
  On the PartialDownsweep test this halves the memory required (from 25G
  to 13G).
  
  Towards #25324
  
  -------------------------
  Metric Increase:
      size_hello_obj
  -------------------------
  

• 571329df
  by Matthew Pickering at 2024-10-07T13:20:06-04:00

  ci: Run the i386 validation job when i386 label is set
  
  This is helpful when making changes to base and must update the
  javascript and i386 base exports files.
  

• e68f9aaf
  by Matthew Pickering at 2024-10-07T13:20:42-04:00

  Rewrite partitionByWorkerSize to avoid pattern match checker bug
  
  With `-g3` the pattern match checker would warn about these incomplete
  patterns. This affects the debug_info builds on CI.
  
  ```
      Pattern match(es) are non-exhaustive
      In an equation for ‘go’:
          Patterns of type ‘[a]’, ‘[a]’, ‘[SpecFailWarning]’ not matched:
              (_:_) _ _
       |
  2514 |         go [] small warnings = (small, warnings)
       |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^...
  ```
  
  Workaround for #25338
  

• d915dc8b
  by Arnaud Spiwack at 2024-10-07T19:23:00-04:00

  Remove the wrapper/coercion-passing logic for submultiplicity checks
  
  Instead, we use a dedicated DelayedError, which is emitted
  systematically on submultiplicity checks, but is suppressed if we can
  indeed solve the submultiplicity constraint with a reflexivity
  coercion.
  
  This way, we don't have to return anything from `tcSubMult`, which now
  looks like a regular constraint check, the rest is implementation
  detail. This removes all of the strange boilerplate that I'd been
  struggling with under the previous implementation. Even if
  submultiplicity checks are not properly constraints, this way it's
  contained entirely within a `WantedConstraint`. Much more pleasant.
  
  Closes #25128.
  

• 1d226116
  by Sven Tennie at 2024-10-07T19:23:37-04:00

  AArch64: Implement switch/jump tables (#19912)
  
  This improves the performance of Cmm switch statements (compared to a
  chain of if statements.)
  

• 3fe621dd
  by Mario Blažević at 2024-10-07T19:24:18-04:00

  Fixes #25256, missing parens inside TH-printed pattern type signature
  

• ea4b4391
  by ARATA Mizuki at 2024-10-07T19:24:59-04:00

  Better documentation for floatRange function
  
  Closes #16479
  

• ff09205c
  by Andreas Klebinger at 2024-10-07T19:25:35-04:00

  Adjust progress message for hadrian to include cwd.
  
  Fixes #25335
  

• 5fd320da
  by Sven Tennie at 2024-10-07T19:26:12-04:00

  CCallConv test: Align argument types
  
  The C calling convention / standard requires that arguments and their
  values are of the same type.
  

• c6e5fd3d
  by Cheng Shao at 2024-10-07T19:26:47-04:00

  hadrian: remove unused ghciWithDebugger field from flavour config
  
  This patch removes the ghciWithDebugger field from flavour config
  since it's actually not used anywhere.
  

• 9c9c790d
  by sheaf at 2024-10-07T19:27:23-04:00

  user's guide: update docs for X86 CPU flags
  
  This commit updates the section of the user's guide pertaining to
  X86 feature flags with the following changes:
  
    - the NCG backend now supports SIMD, so remove all text
      that says the contrary,
    - the LLVM backend does not "automatically detect" features,
      so remove any text that makes that claim.
  

• a1ecc826
  by Sven Tennie at 2024-10-08T13:36:03-04:00

  ci: RISCV64 cross-compile testing
  
  This adds a validation job which tests that we can build a riscv64 cross
  compiler and build a simple program using it. We do not currently run
  the whole testsuite.
  
  Towards #25254
  
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  

• d5c2577f
  by Arnaud Spiwack at 2024-10-08T13:36:44-04:00

  Remove unused accumulators in partition_errors
  

• 55609880
  by Andrzej Rybczak at 2024-10-09T16:41:46-04:00

  Fix typo in the @since annotation of annotateIO
  

• ef481813
  by Alan Zimmerman at 2024-10-09T16:42:23-04:00

  EPA: Remove [AddEpAnn] from (most of) HsExpr
  
  EPA: introduce EpAnnLam for lambda annotationsi, and remove `glAA`
  from `Parser.y`, it is the same as `glR`
  
  EPA: Remove unused annotation from XOpApp
  
  EPA: Use EpToken for XNPat and XNegApp
  
  EPA: specific anns for XExplicitTuple / XTuplePat / sumPatParens.
  
  EPA: Use specific annotation for MultiIf
  
  EPA: Move annotations into FunRhs
  
  EPA: Remove [AddEpAnn] from SigPat and ExprWithTySig
  
  EPA: Remove [AddEpAnn] from ArithSeq
  
  EPA: Remove [AddEpAnn] from HsProc
  
  EPA: Remove [AddEpAnn] from HsStatic
  
  EPA: Remove [AddEpAnn] from BindStmt
  
  EPA: Remove [AddEpAnn] from TransStmt
  
  EPA: Remove [AddEpAnn] from HsTypedSplice
  
  EPA: Remove [AddEpAnn] from HsUntypedSpliceExpr
  

• 69960230
  by Fabian Thorand at 2024-10-10T19:03:59+00:00

  Handle exceptions from IO manager backend
  
  If an IO manager backend throws, it will not actually have registered
  the file descriptor. However, at that point, the IO manager state was
  already updated to assume the file descriptor is being tracked, leading
  to errors and an eventual deadlock down the line as documented in the
  issue #21969.
  
  The fix for this is to undo the IO manager state change in case the
  backend throws (just as we already do when the backend signals that the
  file type is not supported). The exception then bubbles up to user code.
  
  That way we make sure that
  1. the bookkeeping state of the IO manager is consistent with the
     actions taken by the backend, even in the presence of unexpected
     failures, and
  2. the error is not silent and visible to user code, making failures
     easier to debug.
  

• 1587cccf
  by Hassan Al-Awwadi at 2024-10-11T03:52:36-04:00

  Put RdrName in the foExt field of FieldOcc
  
  The main purpose of this commit is to rip RdrName out of FieldOcc, in
  accordance with #21592, and as a side note it has simplified the method
  we use to deal with ambiguity somewhat.
  
  To do the first, we make FieldOccs store (LIdP p) instead of always
  storing Located RdrName, and moved the readername to the extension
  points where necessary.
  
  For the second, well, we just turn an ambiguous RdrName into a unbound
  Name through mkUnboundName. Later during disambiguateRecordBinds of the
  type checking phase, we will try and do type-directed disambiguation based
  on the rdrName field (for now), so this hack works out fine.
  
  See Note [Ambiguous FieldOcc in record updates] for more details.
  
  There are two additional minor changes in this commit:
  *  The HsRecSel constructor of HsExpr has been moved to the extension
  constuctors, since its really GHC specific.
  *  HsProjection no longer has a Located DotFieldOcc as a field, but just a
  regular DotFieldOcc, since DotFieldOcc already wraps a located
  FieldLabelString
  
  co-authored by: @Jade       <Jade512@proton.me>
                  @alt-romes  <rodrigo.m.mesquita@gmail.com>
  

• 2338a971
  by Cheng Shao at 2024-10-11T03:53:13-04:00

  driver: bail out when -fllvm is passed to GHC not configured with LLVM
  
  This patch makes GHC bail out with an proper error message when it's
  not configured with LLVM but users attempt to pass -fllvm, see #25011
  and added comment for details.
  
  Fixes #25011
  
  Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>
  

• 78ad81ec
  by Cristiano Moraes at 2024-10-11T03:53:55-04:00

  configure: Find C++ probing when GCC version is the latest but G++ is old #23118

• 083703a1
  by Simon Peyton Jones at 2024-10-11T03:54:32-04:00

  Consider Wanteds with rewriters as insoluble
  
  This MR fixes #25325
  
  See GHC.Tc.Types.Constraint, Note [Insoluble Wanteds], especially (IW2)
  
  There is a small change in the error message for T14172, but it looks
  entirely acceptable to me.
  

• 0dfaeb66
  by Simon Peyton Jones at 2024-10-11T03:54:32-04:00

  Wibbles
  

• 09d24d82
  by Simon Peyton Jones at 2024-10-11T03:54:32-04:00

  Spelling errors
  

• 694489ed
  by sheaf at 2024-10-11T03:55:14-04:00

  LLVM: use sse4.2 instead of sse42
  
  LLVM expects the former instead of the latter since version 3.4.
  
  Fixes #25019
  

• 06ae8507
  by sheaf at 2024-10-11T03:55:14-04:00

  LLVM: make SSE4.2 imply +popcnt
  
  For consistency with the NCG as well as with Clang and GCC, we make
  the SSE4.2 feature flag imply +popcnt when using the LLVM backend.
  
  Fixes #25353
  

• 3fe843c7
  by Cheng Shao at 2024-10-11T03:55:50-04:00

  Drop obsolete libffi Makefile
  
  This patch drops obsolete libffi Makefile from the tree, given it's
  completely unused since removal of make build system in !7094.
  

• df70405c
  by Ben Gamari at 2024-10-11T03:56:26-04:00

  ghc-internal: Fix incomplete matches on IOError
  
  As noted in #25362, these incomplete matches were previously not being
  warned about. They were easily addressed by use of
  `GHC.Internal.Event.Windows.withException`.
  
  Closes #25362.
  

• 8584504b
  by Matthew Pickering at 2024-10-11T03:57:02-04:00

  compiler: Fix orientation of GHC.Hs.Doc boot file
  
  We should be free to import things from Language.Haskell.Syntax in GHC
  modules. Therefore the the boot file for the loop between ImpExp and
  GHC.Hs.Doc was in the wrong place.
  
  Issue #21592
  

• d029f170
  by Ben Gamari at 2024-10-11T23:43:17-04:00

  testsuite: Normalise trailing digits from hole fits output
  
  The type variables in the holes fit output from
  `abstract_refinement_hole_fits` is quite sensitive to compiler
  configuration. Specifically, a slight change in the inlining
  behavior of `throw` changes type variable naming in `(>>=)` and a few
  others.
  
  Ideally we would make hole fits output more deterministic but in the
  meantime we simply normalise this difference away as it not relevant
  to the test's goal.
  

• da5d7d0d
  by Ben Gamari at 2024-10-11T23:43:17-04:00

  base: Add test for #25066
  

• eb7ddae1
  by Ben Gamari at 2024-10-11T23:43:17-04:00

  base: Fix #25066
  
  As noted in #25066, the exception backtrace proposal introduced a rather
  subtle performance regression due to simplification producing Core which
  the demand analyser concludes may diverge with a precise exception. The
  nature of the problem is more completely described in the new Note
  [Hiding precise exception signature in throw].
  
  The (rather hacky) solution we use here hides the problematic
  optimisation through judicious use of `noinline`. Ultimately however we
  will want a more principled solution (e.g. #23847).
  
  Fixes #255066
  
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/290
  
  Metric Decrease:
      T9872d
  

• 0060ece7
  by Ben Gamari at 2024-10-11T23:43:17-04:00

  base: Improve documentation of Control.Exception.Backtrace
  

• 18f532f3
  by Ben Gamari at 2024-10-11T23:43:53-04:00

  Bump process submodule to v1.6.25.0
  

• a9a3badf
  by Hassan Al-Awwadi at 2024-10-11T23:44:29-04:00

  Move HsInteger and HsRat to an extension constructor
  
  These constructors were only used during the TC stage,
  or during template haskell. It seemed clear that it was
  independent of the source syntax represented in L.H.S,
  and thus we removed it according to #21592.
  

• 4dd30cba
  by Artem Pelenitsyn at 2024-10-11T23:45:09-04:00

  Docs: Linear types: link Strict Patterns subsection
  
  Also, fix a bug in RST with missing newline before a listing.
  
  Co-authored-by: Arnaud Spiwack <arnaud@spiwack.net>
  

• adca5f2b
  by Ben Gamari at 2024-10-11T23:45:45-04:00

  users guide: Address remaining TODOs in eventlog format docs
  
  Closes #25296.
  

• 9291c125
  by Sylvain Henry at 2024-10-11T23:46:26-04:00

  Fix z-encoding of tuples (#25364)
  
  Tuples with prefix/suffix strings weren't always properly encoded with
  their shortcut notations. Fix this.
  

• c08b68bc
  by Sven Tennie at 2024-10-11T23:47:01-04:00

  Delete constants that can be deduced
  
  There are macros in MachRegs.h to figure those out.
  

• 8b402da2
  by Zubin Duggal at 2024-10-12T20:36:57+00:00

  hadrian: Handle broken symlinks properly when creating source dist directories
  
  If we have a broken symlink in the repository, don't try to `need` the symlink
  or the target of the symlink. Attempting to do so has `shake` attempt to read the
  target to compute its hash, which fails because the target doesn't exist.
  

• 16f97667
  by Zubin Duggal at 2024-10-12T20:36:57+00:00

  hadrian: exclude cabal.project.symlink.broken from source archives
  
  Cabal 3.14 introduced a broken symlink in its testsuite. Unfortunately,
  this broke our source distribution as we use use `tar --dereference` to avoid
  issues with symlink compatibility on windows, and `tar --dereference` chokes
  when it encounters any broken symlinks.
  
  We can't get rid of `--dereference` because symlinks are generally broken on
  windows, so the only option is to exclude this file from source archives.
  
  see also https://github.com/haskell/cabal/issues/10442
  

• f1a2c9fc
  by Zubin Duggal at 2024-10-12T20:36:57+00:00

  Bump Cabal submodule to 3.14
  
  Metric Decrease:
      MultiLayerModulesTH_OneShot
  Metric Increase:
      haddock.Cabal
  

• 745dd590
  by Ben Gamari at 2024-10-14T09:13:12-04:00

  users-guide: Document GHCi :where command
  
  Resolve #24509.
  

• e9cc4699
  by Alan Zimmerman at 2024-10-14T09:13:48-04:00

  EPA: Remove [AddEpAnn] from IE, Pat and some Tys
  
  EPA: Remove [AddEpAnn] from LazyPat
  
  EPA: Remove [AddEpAnn] from RecordCon/RecordUpd/ConPat
  
  EPA: Remove [AddEpAnn] from HsFieldBind
  
  EPA: Remove [AddEpAnn] from PatSynBind
  
  EPA: Remove [AddEpAnn] from IPBind
  
  EPA: Remove [AddEpAnn] from FixSig
  
  EPA: Remove [AddEpAnn] from activation rules
  
  EPA: Remove [AddEpann] from SpecInstSig
  
  EPA: Remove [AddEpAnn] from MinimalSig
  
  EPA: Remove [AddEpAnn] from SCCFunSig
  
  EPA: Remove [AddEpAnn] from CompleteMatchSig
  
  EPA: Remove [AddEpAnn] from AnnSig, as used in PatSynSig, ClassOpSig, TypeSig
  
  EPA: Remove [AddEpAnn] from IEThingAbs
  
  EPA: Remove [AddEpAnn] from IEThingAll / IEThingWith
  
  EPA: Remove [AddEpAnn] from IEModuleContents
  
  EPA: Remove [AddEpAnn] from HsOpTy
  
  EPA: Remove [AddEpAnn] for various binders
  
  EPA: Remove [AddEpAnn] for HsIParamTy
  

• 81a570bf
  by Sebastian Graf at 2024-10-14T22:15:31-04:00

  Desugaring, plus -Wincomplete-record-selectors
  
  This commit does several related things:
  
  * Major refactor of the handling of applications in the desugarer.
    Now all applications are handled in `dsApp`, `ds_app` and related
    functions.  This dramatically simplifies the code and removes
    complicated cruft that had accumulated.  Hooray.
  
    Fixes #25281.
  
  * Improve the handling of -Wincomplete-record-selectors.
  
    We now incorporate the result type of unsaturated record selector
    applications as well as consider long-distance information in
    getField applications.
  
    Plus, the implmentation now builds the improved `dsApp` stuff
    above, so it is much easier to understand.
  
    Plus, incorporates improved error message wording suggested
    by Adam Gundry in !12685.
  
    Fixes #24824, #24891
  
    See the long Note [Detecting incomplete record selectors]
  
  * Add -Wincomplete-record-selectors to -Wall, as specified in
    GHC Proposal 516.
  
    To do this, I also had to add -Wno-incomplete-record-selectors
    to the build flags for Cabal in GHC's CI.  See
    hadrian/src/Settings/Warnings.hs.  We can remove this when
    Cabal is updated so that it doesn't trigger the warning:
    https://github.com/haskell/cabal/issues/10402
  
  2.6% decrease in compile time allocation in RecordUpPerf
  
  Metric Decrease:
      RecordUpdPerf
  

• ae7bc08e
  by Simon Peyton Jones at 2024-10-14T22:15:31-04:00

  Elmininate incomplete record selectors
  
  This patch is a pure refactor of GHC's source code, to avoid the use
  of partial record selectors.  It was provoked by adding
  -Wincomplete-record-selectors to -Wall (as the GHC Proposal specified),
  which in turn showed up lots of places where GHC was using incomplete
  record selectors.
  
  This patch does mostly-simple refactoring to make it clear to the pattern
  match checker that there is in fact no partiality.
  
  There is one externally-visible change: I changed the data type HoleFit
  to split out the two cases
  
    data HoleFit = TcHoleFit  TcHoleFit | RawHoleFit SDoc
    data TcHoleFit = HoleFit { ...lots of fields }
  
  There are large swathes of code that just deal with `TcHoleFit`, and
  having it as a separate data types makes it apparent that `RawHoleFit`
  can't occur.
  
  This makes it much better -- but the change is visible in the
  HolePlugin interface.  I decided that there are so few clients of this
  API that it's worth the change.
  
  I moved several functions from Language.Haskell.Syntax to GHC.Hs.
  Reason, when instantiated at (GhcPass _), the extension data construtcor
  is guaranteed unused, and that justifies omitted patterns in these
  functions.  By putting them in GHC.Hs.X I can specialise the type for
  (GhcPass _) and thereby make the function total.
  
  An interesting side-light is that there were a few local function
  definitions without a type signature, like this one in GHC.Parser.Header
       convImport (L _ i) = (ideclPkgQual i, reLoc $ ideclName i)
  This is fully closed, and so is generalised; but that generalises
  it to any old pass, not (GhcPass _), so GHC rightly complains about the
  use of the selector `ideclPkgQual`.  I added a type signature to `i`, thus
       convImport (L _ (i::ImportDecl GhcPs))
           = (ideclPkgQual i, reLoc $ ideclName i)
  which specialised the function enough to make the record selector complete.
  Quite a surprising consequence of local let-generalisation!
  

• 6a067226
  by Simon Peyton Jones at 2024-10-14T22:15:31-04:00

  Add -Werror=-Wno-error=incomplete-record-selectors to hadrian-multi
  
  In the main MR, -Wall now includes -Wincomplete-record-selectors.
  However `hadrian-multi` has many, many warnings about incomplete
  record selectors, so this patch stops those warnings being treated
  as errors.  (See discussion on !13308.)
  
  A better fix would be to remove the use of incomplete record
  selectors, since each of them represents a potential crash.
  

• edeafc14
  by Ben Gamari at 2024-10-14T22:16:08-04:00

  users-guide: Document field coalescence
  

• 55b83587
  by ARATA Mizuki at 2024-10-14T22:16:49-04:00

  LLVM backend: Use correct rounding for Float literals
  
  Fixes #22033
  

• e59fe5c6
  by Hassan Al-Awwadi at 2024-10-15T08:25:33+00:00

  Changed import from Ghc.  module to L.H.S module
  
  Progresses #21592
  
  For some reason we still imported GHC.Types.Fixity when the definitino of Fixity and LexicalFixity have already been moved to Language.Haskell.Syntax.Basic. This fixes that for
  

• ab1767d5
  by Simon Peyton Jones at 2024-10-15T23:45:04-04:00

  Add a release-notes entry for -Wincomplete-record-selectors
  

• 6f0a62db
  by ur4t at 2024-10-16T15:33:43+00:00

  GHCi: fix improper location of ghci_history file
  
  Fixes #24266
  

• 5f67db48
  by Alan Zimmerman at 2024-10-17T05:18:43-04:00

  EPA: Remove [AddEpAnn] commit 3
  
  EPA: Remove [AddEpAnn] from HsDocTy
  
  EPA: Remove [AddEpAnn] from HsBangTy
  
  EPA: Remove [AddEpAnn] from HsExplicitListTy
  
  EPA: Remove [AddEpAnn] from HsExplicitTupleTy
  
  EPA: Remove [AddEpAnn] from HsTypedBracket
  
  EPA: Remove [AddEpAnn] from HsUntypedBracket
  
  EPA: Remove [AddEpAnn] from PatBuilderOpApp
  
  EPA: break out 'EpToken "|"' from ClassDecl anns
  
  EPA: Remove [AddEpAnn] from ClassDecl
  
  EPA: Remove [AddEpAnn] from SynDecl
  

• fbbbd010
  by Daan Rijks at 2024-10-17T05:19:19-04:00

  Expand the haddocks for Control.Category
  

• 076c1a10
  by Andrew Lelechenko at 2024-10-17T05:19:19-04:00

  documentation: more examples for Control.Category
  

• 90891962
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  ghci: mitigate host/target word size mismatch in BCOByteArray serialization
  
  This patch mitigates a severe host/target word size mismatch issue in
  BCOByteArray serialization logic introduced since !12142, see added
  note for detailed explanation.
  

• 839ac52e
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  ghci: use plain malloc for mkConInfoTable on non-TNTC platforms
  
  This patch avoids using mmap() to allocate executable memory for
  mkConInfoTable on platforms without tables-next-to-code, see added
  comment for explanation.
  

• a998f69d
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  ghc-internal: add missing CPPs for wasm
  
  This patch adds some missing CPP guards to ghc-internal, given those
  functions are non existent on wasm and would cause linking issues.
  

• 71a471e7
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  rts: rename prelude.js to prelude.mjs
  
  This commit renames prelude.js to prelude.mjs for wasm backend rts
  jsbits, and slightly adjusts the jsbits contents. This is for
  preparing the implementation of dyld.mjs that contains wasm dynamic
  linker logic, which needs to import prelude.mjs as a proper ESM
  module.
  

• 33d9db17
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  rts: add __wrapped_freeJSVal
  
  This commit wraps imported freeJSVal in a __wrapped_freeJSVal C
  function for wasm backend RTS. In general, wasm imports are only
  supposed to be directly called by C; they shouldn't be used as
  function pointers, which confuses wasm-ld at link-time when generating
  shared libraries.
  

• 0d0a16a8
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  rts: correct stale link in comment
  

• 90a35c41
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  rts: drop interpretBCO support from non-dyn ways on wasm
  
  This commit drops interpretBCO support from non dynamic rts ways on
  wasm. The bytecode interpreter is only useful when the RTS linker also
  works, and on wasm it only works for dynamic ways anyway. An
  additional benefit of dropping interpretBCO is reduction in code size
  of linked wasm modules, especially since interpretBCO references
  ffi_call which is an auto-generated large function in libffi-wasm and
  unused by most user applications.
  

• 98a32ec5
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  rts: don't build predefined GloblRegs for wasm PIC mode
  
  This commit wraps the predefined GlobalRegs in Wasm.S under a CPP
  guard to prevent building for PIC mode. When building dynamic ways of
  RTS, the wasm globals that represent STG GlobalRegs will be created
  and supplied by dyld.mjs. The current wasm dylink convention doesn't
  properly support exporting relocatable wasm globals at all, any wasm
  global exported by a .so is assumed to be a GOT.mem entry.
  

• bef94bde
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  rts: fix conflicting StgRun definitions on wasm
  
  This commit fixes conflicting StgRun definition when building dynamic
  ways of RTS for wasm in unregisterised mode.
  

• a6a82cdb
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian: use targetSupportsRPaths predicate
  
  This commit changes the hostSupportsRPaths predicate to
  targetSupportsRPaths and use that to decide whether to pass
  RPATH-related link-time options. It's not applied to stage0, we should
  just use the default link-time options of stageBoot ghc.
  

• f232c872
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian: disable internal-interpreter of ghc library when cross compiling
  
  This commit disable the internal-interpreter flag of ghc library when
  cross compiling, only external interpreter works in such cases.
  

• 577c1819
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian: enable internal-interpreter for ghc-bin stage0
  
  This commit enables internal-interpreter flag for ghc-bin even when
  compiling stage0, as long as target supports ghci. It enables ghci
  functionality for cross targets that support ghci, since cross ghc-bin
  is really stage0.
  

• c247f2ee
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian: fix CFLAGS for gmp shared objs on wasm
  
  This commit adds -fvisibility=default to CFLAGS of gmp when building
  for wasm. This is required to generate the ghc-bignum shared library
  without linking errors. Clang defaults to -fvisibility=hidden for wasm
  targets, which will cause issues when a symbol is expected to be
  exported in a shared library but without explicit visibility attribute
  annotation.
  

• 775410fd
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian: re-enable PIC for gmp on wasm
  
  This commit re-enables --with-pic=yes configuration option of gmp when
  building for wasm, given we're about to include support for shared
  libraries, TH and ghci.
  

• b45080a3
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian: add the host_fully_static flavour transformer
  
  This commit adds the host_fully_static flavour transformer to hadrian,
  which ensures stage0 is fully statically linked while still permitting
  stage1 libdir to contain shared libraries. This is intended to be used
  by the wasm backend to build portable linux bindists that contain wasm
  shared libraries.
  

• 5043507c
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  ci: update wasm jobs configuration
  
  This commit bumps ci-image revision to use updated wasm toolchain, and
  use host_fully_static instead of fully_static for wasm jobs so to
  ensure wasm shared libraries can be properly built.
  

• 2956a3f7
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian/testsuite: implement config.cross logic
  
  This commit implements the config.cross field in the testsuite driver.
  It comes from the "cross compiling" ghc info field for both
  in-tree/out-of-tree GHC, and is an accurate predicate of whether we're
  cross-compiling or not (compared to the precense of target emulator),
  and is useful to implement predicates to assert the precense of
  internal interpreter (only available on non-cross GHC) for tests that
  do require it (e.g. plugins).
  

• 8c74a0ed
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  hadrian/compiler: implement targetRTSLinkerOnlySupportsSharedLibs
  
  This patch implements the targetRTSLinkerOnlySupportsSharedLibs
  predicate in hadrian. Its definition in hadrian is the single source
  of truth, and the information propagates to ghc settings file, ghc
  driver and testsuite driver. It is used in various places to ensure
  dynamic dependency is selected when the target RTS linker only
  supports loading dynamic code.
  

• b4c3c340
  by Cheng Shao at 2024-10-17T16:41:18+00:00

  testsuite: don't use host cpu features when testing cross ghc
  
  This patch disables CPU feature detection logic when testing cross
  GHC, since those features don't make sense for the target anyway.
  

• 3c21b696
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: implement & use req_plugins predicate
  
  This commit implements req_plugins predicate to indicate that the test
  requires plugin functionality. Currently this means cross GHC is
  disabled since internal-interpreter doesn't work in cross GHC yet.
  

• 93b8af80
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: make use of config.interp_force_dyn
  
  This commit takes config.interp_force_dyn into consideration when
  setting up TH/ghci way flags.
  

• 94673d41
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: bump T17572 timeout
  

• 2b5efc2d
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: bump T22744 pre_cmd timeout
  

• 45102e2a
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: skip terminfo_so for cross ghc
  

• 05e40406
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: fix shared library size tests for cross ghc
  
  This commit fixes shared library size tests (e.g. array_so in
  testsuite/tests/perf/size/all.T) when testing cross ghc. Previously,
  if shared library file extension of host and target differs, those
  tests will fail with framework errors due to not finding the right
  files.
  

• fa68f833
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: skip ghc api tests that attempt to spawn processes inside wasm
  
  This commit skips a few ghc api tests on wasm, since they would
  attempt to spawn processes inside wasm, which is not supported at all.
  

• 1241c04e
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: skip T22840 due to broken -dtag-inference-checks on wasm
  

• 78c8b900
  by Cheng Shao at 2024-10-17T16:41:19+00:00

  testsuite: ensure $(ghciWayFlags) can be overridden
  
  This commit revises boilerplate.mk in testsuite as well as a few other
  places, to ensure the tests that do make use of $(ghciWayFlags) can
  receive the right $(ghciWayFlags) from testsuite driver config.
  

• 47989ecc
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  testsuite: skip rdynamic on wasm
  

• fefb4ea1
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  testsuite: skip T2615 on wasm
  
  This commit marks T2615 as skip on wasm, given LD_* environment
  variables aren't supported on wasm anyway.
  

• 77c79762
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  testsuite: mark MultiLayerModulesTH_Make/MultiLayerModulesTH_OneShot as fragile on wasm
  

• 69bb4745
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  testsuite: fix T16180 on wasm
  
  This commit fixes T16180 on wasm once TH support is flipped on. The
  fix is simply adding right asm code for wasm.
  

• 621c753d
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  driver: fix -fexternal-interpreter flag for JS backend
  
  Previously, -fexternal-interpreter is broken for JS backend, since GHC
  would attempt to launch a non-existent ghc-iserv* executable. This
  commit fixes it by adjusting pattern matching order in
  setTopSessionDynFlags.
  

• 80aa8983
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  driver: use interpreterDynamic predicate in preloadLib
  
  This commit use the interpreterDynamic predicate in preloadLib to
  decide if we should do dynLoadObjs instead of loadObj. Previously we
  used hostIsDynamic which was only written with non-cross internal
  interpreter in mind.
  
  The testsuite is also adjusted to remove hard-wired -fPIC flag for
  cbits (doesn't work in i386 RTS linker in vanilla way, #25260) and
  properly pass ghc_th_way_flags to ghc.
  

• 74411461
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  compiler: fix Cmm dynamic CLabels for wasm
  
  This commit fixes the handling of dynamic CLabels for the wasm
  backend. Just do the simplest handling: preserve the original CLabel,
  both unreg/NCG backends can handle them properly without issue.
  

• f6abaf13
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  driver: add necessary compile-time flags for wasm PIC mode
  
  This commit adds necessary compile-time flags when compiling for wasm
  PIC mode, see added comment for detailed explanation.
  

• 9745fcfb
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  driver: add necessary link-time flags for wasm shared libs
  
  This commit adds necessary link-time flags for wasm shared libs, see
  added comments for detailed explanation.
  

• 649aae00
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  driver: enforce -fno-use-rpaths for wasm
  
  This commit ensures the GHC driver never passes any RPATH-related
  link-time flags on wasm, which is not supported at all.
  

• 47baa904
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  driver: ensure static archives are picked when linking static .wasm modules
  
  This commit ensures static archives are picked when linking .wasm
  modules which are supposed to be fully static, even when ghc may be
  invoked with -dynamic, see added comment for explanation.
  

• fc3a5591
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  compiler: fix dynamic_too_enable for targets that require dynamic libraries
  
  This commit fixes dynamic_too_enable for targets whose RTS linker can
  only load dynamic code.
  

• 94ef949e
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  compiler: fix checkNonStdWay for targets that require dynamic libraries
  
  This commit fixes checkNonStdWay to ensure that for targets whose RTS
  linker can only load dynamic code, the dynamic way of object is
  selected.
  

• 88e99248
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  ghc-bin: enforce dynamic way when the target requires so
  
  This commit makes ghc-bin use dynamic way when it is doing interactive
  stuff on certain targets whose RTS linker can only handle dynamic
  code.
  

• 549582ef
  by Cheng Shao at 2024-10-17T16:41:24+00:00

  hadrian/ghci: add wasm dyld
  
  This commit adds the wasm dynamic linker implementation, as well as
  ghci logic to call it and hadrian logic to install it to the correct
  location. See the top-level note in utils/jsffi/dyld.mjs for more
  details.
  

• b562e3a6
  by Cheng Shao at 2024-10-17T16:41:29+00:00

  driver: fix getGccSearchDirectory for wasm target
  
  This commit fixes getGccSearchDirectory logic for wasm target, ensures
  the correct search directory containing libc.so etc can be found by
  GHC. getGccSearchDirectory is also exported so it can be used
  elsewhere to obtain the wasi-sdk libdir and pass to the dyld script.
  

• 2d6107dc
  by Cheng Shao at 2024-10-17T16:41:29+00:00

  driver: add wasm backend iserv logic
  
  This commit adds wasm backend iserv logic to the driver, see added
  comments for explanation.
  

• 61f5baa5
  by Cheng Shao at 2024-10-17T16:41:29+00:00

  compiler: add PIC support to wasm backend NCG
  
  This commit adds support for generating PIC to the wasm backend NCG.
  

• 652e7239
  by Cheng Shao at 2024-10-17T16:41:29+00:00

  hadrian/compiler: flip on support for shared libs & ghci for wasm
  
  This commit flips on the support for shared libs and ghci for the wasm
  target, given all required support logic has been added in previous
  commits.
  

• 74a1f681
  by Cheng Shao at 2024-10-17T16:41:29+00:00

  testsuite: flip on support for shared libs, TH & ghci for wasm
  
  This commit flips on support for shared libs, TH & ghci for wasm in
  the testsuite, given support has been landed in previous commits.
  

• 525d451e
  by Cheng Shao at 2024-10-17T23:03:34-04:00

  Revert "compiler: start deprecating cmmToRawCmmHook"
  
  This reverts commit 1c064ef1f3e1aa2afc996e962ad53effa99ec5f4. Turns
  out the GHC-WPC project does use it to observe Cmm in the pipeline,
  see #25363.
  

• 5bcfefd5
  by Cheng Shao at 2024-10-17T23:04:09-04:00

  rts: fix pointer overflow undefined behavior in bytecode interpreter
  
  This patch fixes an unnoticed undefined behavior in the bytecode
  interpreter. It can be caught by building `rts/Interpreter.c` with
  `-fsanitize=pointer-overflow`, the warning message is something like:
  
  ```
  rts/Interpreter.c:1369:13: runtime error: addition of unsigned offset to 0x004200197660 overflowed to 0x004200197658
  SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior rts/Interpreter.c:1369:13
  rts/Interpreter.c:1265:13: runtime error: addition of unsigned offset to 0x004200197660 overflowed to 0x004200197658
  SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior rts/Interpreter.c:1265:13
  rts/Interpreter.c:1645:13: runtime error: addition of unsigned offset to 0x0042000b22f8 overflowed to 0x0042000b22f0
  SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior rts/Interpreter.c:1645:13
  ```
  
  Whenever we do something like `SpW(-1)`, the negative argument is
  implicitly converted to an unsigned integer type and causes pointer
  arithmetic overflow. It happens to be harmless for most targets since
  overflowing would wrap the result to desired value, but it's still
  coincidental and undefined behavior. Furthermore, it causes real
  damage to the wasm backend, given clang-20 will emit invalid wasm code
  that crashes at run-time for this kind of C code! (see
  https://github.com/llvm/llvm-project/issues/108770)
  
  The fix here is adding some explicit casts to ensure we always use the
  signed `ptrdiff_t` type as right hand operand of pointer arithmetic.
  

• eb67875f
  by Matthew Craven at 2024-10-18T12:18:35+00:00

  Bump transformers submodule
  
  The svg image files mentioned in transformers.cabal were
  previously not checked in, which broke sdist generation.
  

• 366a1109
  by Matthew Craven at 2024-10-18T12:18:35+00:00

  Remove reference to non-existent file in haddock.cabal
  

• 826852e9
  by Matthew Craven at 2024-10-18T12:18:35+00:00

  Move tests T11462 and T11525 into tests/tcplugins
  

• dbe27152
  by Matthew Craven at 2024-10-18T12:18:35+00:00

  Repair the 'build-cabal' hadrian target
  
  Fixes #23117. Fixes #23281. Fixes #23490.
  
  This required:
   * Updating the bit-rotted compiler/Setup.hs and its setup-depends
   * Listing a few recently-added libraries and utilities
     in cabal.project-reinstall
   * Setting allow-boot-library-installs to 'True' since Cabal
     now considers the 'ghc' package itself a boot library for
     the purposes of this flag
  
  Additionally, the allow-newer block in cabal.project-reinstall
  was removed.  This block was probably added because when the
  libraries/Cabal submodule is too new relative to the cabal-install
  executable, solving the setup-depends for any package with a custom
  setup requires building an old Cabal (from Hackage) against the
  in-tree version of base, and this can fail un-necessarily due to
  tight version bounds on base.  However, the blind allow-newer can
  also cause the solver to go berserk and choose a stupid build plan
  that has no business succeeding, and the failures when this happens
  are dreadfully confusing. (See #23281 and #24363.)
  
  Why does setup-depends solving insist on an old version of Cabal? See:
    https://github.com/haskell/cabal/blob/0a0b33983b0f022b9697f7df3a69358ee9061a89/cabal-install/src/Distribution/Client/ProjectPlanning.hs#L1393-L1410
  
  The right solution here is probably to use the in-tree cabal-install
  from libraries/Cabal/cabal-install with the build-cabal target rather
  than whatever the environment happens to provide.  But this is left
  for future work.
  

• b3c00c62
  by Matthew Craven at 2024-10-18T12:18:35+00:00

  Revert "CI: Disable the test-cabal-reinstall job"
  
  This reverts commit 38c3afb64d3ffc42f12163c6f0f0d5c414aa8255.
  

• a04959b8
  by Daneel Yaitskov at 2024-10-19T09:34:15-04:00

  base: speed up traceEventIO and friends when eventlogging is turned off #17949
  
  Check the RTS flag before doing any work with the given lazy string.
  
  Fix #17949
  
  Co-authored-by: Michael Peyton Jones <me@michaelpj.com>
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  

• eff16c22
  by Matthew Pickering at 2024-10-19T21:55:55-04:00

  ci: Add support for ONLY_JOBS variable to trigger any validation pipeline
  
  By setting the ONLY_JOBS variable to the name of the job (or multiple
  jobs), the resulting
  pipeline will include a validation job for that pipeline.
  
  For example - if you set ONLY_JOBS="x86_64-linux-ubuntu22_04-validate"
  then a ubuntu22_04 job will be included in the validation pipeline. This
  is useful for testing specific jobs.
  
  Fixes #25332
  

• 280b6278
  by Zubin Duggal at 2024-10-19T21:56:31-04:00

  rel-eng: ghcup metadata generation: generated yaml anchors with meaningful names
  
  (cherry picked from commit d83f5bd730a8aef37d8a38b3560590d9798f8e45)
  

• 25edf849
  by Alan Zimmerman at 2024-10-19T21:57:08-04:00

  EPA: Remove [AddEpAnn] Commit 4
  
  EPA: Remove [AddEpAnn] from DataDecl
  
  This is quite a big change.
  The most important part is moving the annotations into HsDataDefn,
  using a specific annotation data type.
  
  It has a knock-on to everything that uses HsDataDefn
  
  EPA: Remove [AddEpAnn] for FunDep
  
  EPA: Remove [AddEpann] from FamilyDecl
  
  EPA: Remove [AddEpAnn] From InjectivityAnn
  
  EPA: Remove [AddEpAnn] from DefaultDecl
  
  EPA: Remove [AddEpAnn] from RuleDecls
  
  EPA: Remove [AddEpAnn] from Warnings
  

• d5f42045
  by Luite Stegeman at 2024-10-20T16:34:47-04:00

  Interpreter: Add locking for communication with external interpreter
  
  This adds locking to communication with the external interpreter
  to prevent concurrent tasks interfering with each other. This
  fixes Template Haskell with the external interpreter in parallel (-j)
  builds.
  
  Fixes #25083
  

• d6bfea76
  by Matthew James Kraai at 2024-10-20T16:35:29-04:00

  Use monospace font for "Either a b" in fmap docs
  
  The documentation for fmap shows "`Either a b`" in the default font
  instead of showing "Either a b" in a monospace font.
  

• 4bc7f9c8
  by Luite Stegeman at 2024-10-20T16:36:15-04:00

  Parser: remove non-ASCII characters from Parser.y
  
  Non-ASCII characters in the source causes a problem with the default
  Haskell Language Server setup in VSCode. Two characters seems to have
  been left in by accident.
  
  Workaround for #25396
  

• 7f61ed4e
  by Alan Zimmerman at 2024-10-21T06:39:45-04:00

  EPA: Remove [AddEpAnn] Commit 5
  
  EPA: Remove [AddEpAnn] from AnnPragma
  
  EPA: Remove [AddEpAnn] From ForeignDecl
  
  EPA: Remove [AddEpAnn] from RoleAnnotDecl
  
  EPA: Remove [AddEpAnn] from StandaloneKindSig
  
  EPA: Remove [AddEpAnn] From HsDeriving
  
  EPA: Remove [AddEpAnn] from ConDeclField
  
  EPA: Remove [AddEpAnn] from ConDeclGADT
  
  EPA: Remove [AddEpAnn] from ConDeclH98
  
  EPA: Remove [AddEpAnn] from ClsInstDecl
  

• f8694fe7
  by Cheng Shao at 2024-10-21T06:40:21-04:00

  wasm: bump dyld v8 heap size limit
  
  This patch adds `--max-old-space-size=8192` to wasm dyld shebang
  arguments to bump V8 heap size limit. The default limit
  (`heap_size_limit` returned by `v8.getHeapStatistics()`) is
  dynamically determined and a bit too low under certain workloads, and
  V8 would waste too much CPU time to garbage collect old generation
  heap more aggressively. Bumping the limit to 8G doesn't imply dyld
  would really take that much memory at run-time, but it lessens V8 heap
  stress significantly.
  

• d328d173
  by Luite Stegeman at 2024-10-21T12:39:18+00:00

  Add requestTickyCounterSamples to GHC.Internal.Profiling
  
  This allows the user to request ticky counters to be written to
  the eventlog at specific times.
  
  See #24645
  

• 71765b1d
  by Simon Peyton Jones at 2024-10-21T20:55:00-04:00

  Move defaulting code into a new module
  
  GHC.Tc.Solver had reached 4,000 lines -- although quite a lot of them
  are comments.
  
  This MR
  
  * Adds the new module GHC.Tc.Solver.Default, which has all the
    complex, but well modularised, defaulting code
  
  * Moves a bit of code from GHC.Tc.Solver into the existing
    GHC.Tc.Solver.Solve. Notably solveWanteds and simplifyWantedsTcM,
    which are called from GHC.Tc.Solver.Default
  
  It's a pure refactor.  No code changes.
  

• a398227b
  by Simon Peyton Jones at 2024-10-21T20:55:00-04:00

  Improve the generalisation code in Solver.simplifyInfer
  
  The code in `decideQuantification` has become quite complicated.
  This MR straightens it out, adds a new Note, and on the way
  fixes #25266.
  
  See especially Note [decideAndPromoteTyVars] which is is where
  all the action happens in this MR.
  

• 148059fe
  by Andrzej Rybczak at 2024-10-21T20:55:40-04:00

  Adjust catches to properly rethrow exceptions
  
  https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13302 implemented exception
  rethrowing proposal, but it didn't adjust `catches`. This fixes it.
  

• 25121dbc
  by doyougnu at 2024-10-22T09:38:18-04:00

  linker: add --optimistic-linking flag
  
  This patch adds:
  
  - the --optimistic-linking flag which binds unknown symbols in the
  runtime linker to 0xDEADBEEF instead of exiting with failure
  
  - The test T25240 which tests these flags using dead code in the FFI system.
  
  - closes #25240
  
  This patch is part of the upstreaming haskell.nix patches project.
  

• f19e076d
  by doyougnu at 2024-10-22T09:38:18-04:00

  ghc-internal: hide linkerOptimistic in MiscFlags
  

• edc02197
  by Cheng Shao at 2024-10-22T09:38:54-04:00

  hadrian: fix bindist executable wrapper logic for cross targets
  
  This commit fixes an oversight of hadrian wrapper generation logic:
  when doing cross compilation, `wrapper` is called on executable names
  with cross prefix, therefore we must use `isSuffixOf` when matching to
  take the cross prefix into account. Also add missing cross prefix to
  ghci wrapper content and fix hsc2hs wrapper logic.
  

• edf3bdf5
  by Andreas Klebinger at 2024-10-22T16:30:42-04:00

  mkTick: Push ticks through unsafeCoerce#.
  
  unsafeCoerce# doesn't exist at runtime so we should treat it like a Cast
  for the purpose of mkTick.
  
  This means if we have `{-# SCC foo #-} (unsafeCoerce# trivial_expr))` we
  now push the scope part of the cost centre up to `trivial_expr` at which
  point we can discard it completely if the expression is trivial enough.
  
  This fixes #25212.
  

• 1bdb1317
  by Cheng Shao at 2024-10-22T16:31:17-04:00

  hadrian: enable late-CCS for perf flavour as well
  
  This patch enables late-CCS for perf flavour so that the testsuite can
  pass for perf as well. Fixes #25308.
  

• fde12aba
  by Cheng Shao at 2024-10-22T16:31:54-04:00

  hadrian: make sure ghc-bin internal-interpreter is disabled for stage0 when not cross compiling
  
  This patch disables internal-interpreter flag for stage0 ghc-bin when
  not cross compiling, see added comment for explanation. Fixes #25406.
  

• 6ab8d751
  by ignatiusm at 2024-10-24T01:23:35-04:00

  Improve heap overflow exception message (#25198)
  
  Catch heap overflow exceptions and suggest using `+RTS -M<size>`.
  
  Fix #25198
  

• b3f7fb80
  by Rodrigo Mesquita at 2024-10-24T01:24:12-04:00

  determinism: Interface re-export list det
  
  In 'DocStructureItem' we want to make sure the 'Avails' are sorted, for
  interface file determinism. This commit introduces 'DetOrdAvails', a
  newtype that should only be constructed by sorting Avails with
  'sortAvails' unless the avails are known to be deterministically
  ordered. This newtype is used by 'DocStructureItem' where 'Avails' was
  previously used to ensure the list of avails is deterministically sorted
  by construction.
  
  Note: Even though we order the constructors and avails in the interface
  file, the order of constructors in the haddock output is still
  determined from the order of declaration in the source. This was also
  true before, when the list of constructors in the interface file <docs>
  section was non-deterministic. Some haddock tests such as
  "ConstructorArgs" observe this (check the order of constructors in
  out/ConstructorArgs.html vs src/ConstructorArgs.hs vs its interface file)
  
  The updated tests are caused by haddock corners where the order in the
  source is not preserved (and was non-deterministic before this PR):
      * Module header in the latex backend
      * Re-export of pattern synonyms associated to a datatype (#25342)
  
  Fixes #25304
  

• e39c8c99
  by Rodrigo Mesquita at 2024-10-24T01:24:12-04:00

  Revert "ci: Allow abi-test to fail."
  
  After #25304, the abi-test with interface and object determinism
  succeeds.
  
  This reverts commit 7b37afc9f3e79559055488998ee73187886a0e00.
  

• 7b1b0c6d
  by Alan Zimmerman at 2024-10-24T13:07:02-04:00

  EPA: reduce [AddEpann] in AnnList
  
  Remove it from the `al_rest` field, and make `AnnList` parameterized
  on a type to be used in `al_rest`, for the various use cases.
  

• 4a00731e
  by Rodrigo Mesquita at 2024-10-24T13:07:38-04:00

  Fix -fobject-determinism flag definition
  
  The flag should be defined as an fflag to make sure the
  -fno-object-determinism flag is also an available option.
  
  Fixes #25397
  

• 55e4b9f2
  by Sebastian Graf at 2024-10-25T07:01:54-04:00

  CorePrep: Attach evaldUnfolding to floats to detect more values
  
  See `Note [Pin evaluatedness on floats]`.
  

• 9f57c96d
  by Sebastian Graf at 2024-10-25T07:01:54-04:00

  Make DataCon workers strict in strict fields (#20749)
  
  This patch tweaks `exprIsConApp_maybe`, `exprIsHNF` and friends, and Demand
  Analysis so that they exploit and maintain strictness of DataCon workers. See
  `Note [Strict fields in Core]` for details.
  
  Very little needed to change, and it puts field seq insertion done by Tag
  Inference into a new perspective: That of *implementing* strict field semantics.
  Before Tag Inference, DataCon workers are strict. Afterwards they are
  effectively lazy and field seqs happen around use sites. History has shown
  that there is no other way to guarantee taggedness and thus the STG Strict Field
  Invariant.
  
  Knock-on changes:
  
    * I reworked the whole narrative around "Tag inference".
      It's now called "EPT enforcement" and I recycyled the different overview
      Notes into `Note [EPT enforcement]`.
  
    * `exprIsHNF` previously used `exprOkForSpeculation` on unlifted arguments
      instead of recursing into `exprIsHNF`. That regressed the termination
      analysis in CPR analysis (which simply calls out to `exprIsHNF`), so I made
      it call `exprOkForSpeculation`, too.
  
    * There's a small regression in Demand Analysis, visible in the changed test
      output of T16859: Previously, a field seq on a variable would give that
      variable a "used exactly once" demand, now it's "used at least once",
      because `dmdTransformDataConSig` accounts for future uses of the field
      that actually all go through the case binder (and hence won't re-enter the
      potential thunk). The difference should hardly be observable.
  
    * The Simplifier's fast path for data constructors only applies to lazy
      data constructors now. I observed regressions involving Data.Binary.Put's
      `Pair` data type.
  
    * Unfortunately, T21392 does no longer reproduce after this patch, so I marked
      it as "not broken" in order to track whether we regress again in the future.
  
  Fixes #20749, the satisfying conclusion of an annoying saga (cf. the ideas
  in #21497 and #22475).
  
  Compiler perf generally improves, sometimes drastically:
  
                                                       Baseline
                                   Test    Metric          value      New value Change
  --------------------------------------------------------------------------------
               ManyConstructors(normal) ghc/alloc  3,629,760,116  3,711,852,800  +2.3%  BAD
    MultiLayerModulesTH_OneShot(normal) ghc/alloc  2,502,735,440  2,565,282,888  +2.5%  BAD
                         T12707(normal) ghc/alloc    804,399,798    791,807,320  -1.6% GOOD
                         T17516(normal) ghc/alloc    964,987,744  1,008,383,520  +4.5%
                         T18140(normal) ghc/alloc     75,381,152     49,860,560 -33.9% GOOD
                        T18698b(normal) ghc/alloc    232,614,457    184,262,736 -20.8% GOOD
                         T18923(normal) ghc/alloc     62,002,368     58,301,408  -6.0% GOOD
                         T20049(normal) ghc/alloc     75,719,168     70,494,368  -6.9% GOOD
                          T3294(normal) ghc/alloc  1,237,925,833  1,157,638,992  -6.5% GOOD
                          T9233(normal) ghc/alloc    686,490,105    635,166,688  -7.5% GOOD
  
                              geo. mean                                          -0.7%
                              minimum                                           -33.9%
                              maximum                                            +4.5%
  
  I looked at T17516. It seems we do a few more simplifier iterations and end up
  with a larger program. It seems that some things inline more, while other things
  inline less. I don't see low-hanging fruit.
  
  I also looked at MultiLayerModulesTH_OneShot. It appears we generate a strange
  join point in the `getUnique` method of `Uniquable GHC.Unit.Types.Module` that
  should better call-site inline, but does not. Perhaps with !11492.
  
  NoFib does not seem affected much either:
  
  +-------------------------------++--+------------+-----------+---------------+-----------+
  |                               ||  |      base/ | std. err. | T20749/ (rel) | std. err. |
  +===============================++==+============+===========+===============+===========+
  |           spectral/last-piece ||  |    7.263e8 |      0.0% |        +0.62% |      0.0% |
  +===============================++==+============+===========+===============+===========+
  |                     geom mean ||  |     +0.00% |           |               |           |
  +-------------------------------++--+------------+-----------+---------------+-----------+
  
  I had a look at last-piece. Nothing changes in stg-final, but there is a bit
  of ... movement around Data.Map.insert's use of GHC.Exts.lazy that is gone in
  stg-final.
  
  Co-Authored-By: Jaro Reinders <jaro.reinders@gmail.com>
  
  Metric Decrease:
      T12707
      T18140
      T18698b
      T18923
      T19695
      T20049
      T3294
      T9233
      T21839c
  Metric Increase:
      ManyConstructors
      MultiLayerModulesTH_OneShot
  

• 0225249a
  by Simon Peyton Jones at 2024-10-25T07:02:32-04:00

  Some renaming
  
  This is a pure refactor, tidying up some inconsistent naming:
  
     isEqPred          -->  isEqClassPred
     isEqPrimPred      -->  isEqPred
     isReprEqPrimPred  -->  isReprEqPred
     mkPrimEqPred      -->  mkNomEqPred
     mkReprPrimEqPred  -->  mkReprEqPred
     mkPrimEqPredRold  -->  mkEqPredRole
  
  Plus I moved mkNomEqPred, mkReprEqPred, mkEqPredRolek
    from GHC.Core.Coercion to GHC.Core.Predicate
  where they belong.  That means that Coercion imports Predicate
  rather than vice versa -- better.
  

• 15a3456b
  by Ryan Hendrickson at 2024-10-25T07:02:32-04:00

  compiler: Fix deriving with method constraints
  
  See Note [Inferred contexts from method constraints]
  
  Co-authored-by: Simon Peyton Jones <simon.peytonjones@gmail.com>
  

• dbc77ce8
  by Alan Zimmerman at 2024-10-25T18:20:13+01:00

  EPA: Remove AddEpann commit 7
  
  EPA: Remove [AddEpAnn] from HYPHEN in Parser.y
  
  The return value is never used, as it is part of the backpack
  configuration parsing.
  
  EPA: Remove last [AddEpAnn] usages
  
  Remove residual usage in GHC. It is still used
  - In haddock TTG extension point definitions (to be removed)
  - Some check-exact residual, to be removed
  - Comments around DisambECP in PostProcess
  
  EPA: Clean up [AddEpAnn] from check-exact
  
  There is one left, to be cleaned up when we remove AddEpann itself
  
  EPA: Remove [AddEpAnn] from haddock
  
  The TTG extension points need a value, it is not critical what that
  value is, in most cases.
  
  EPA: Remove AddEpAnn from HsRuleAnn
  
  EPA: Remove AddEpAnn from HsCmdArrApp
  

• 23ddcc01
  by Simon Peyton Jones at 2024-10-26T12:44:34-04:00

  Fix optimisation of InstCo
  
  It turned out (#25387) that the fix to #15725 was not quite right:
  
    commit 48efbc04bd45d806c52376641e1a7ed7278d1ec7
    Date:   Mon Oct 15 10:25:02 2018 +0200
  
      Fix #15725 with an extra Sym
  
  Optimising InstCo is quite subtle, and the invariants surrounding
  the LiftingContext in the coercion optimiser were not stated explicitly.
  
  This patch refactors the InstCo optimisation, and documents these
  invariants.  See
    * Note [Optimising InstCo]
    * Note [The LiftingContext in optCoercion]
  
  I also did some refactoring of course:
  
  * Instead of a Bool swap-flag, I am not using GHC.Types.Basic.SwapFlag
  
  * I added some invariant-checking the coercion-construction functions
    in GHC.Core.Coercion.Opt.  (Sadly these invariants don't hold during
    typechecking, becuase the types are un-zonked, so I can't put these
    checks in GHC.Core.Coercion.)
  

• 589fea7f
  by Cheng Shao at 2024-10-27T05:36:38-04:00

  ghcid: use multi repl for ghcid
  

• d52a0475
  by Andrew Lelechenko at 2024-10-27T05:37:13-04:00

  documentation: add motivating section to Control.Monad.Fix
  

• 301c3b54
  by Cheng Shao at 2024-10-27T05:37:49-04:00

  wasm: fix safari console error message related to import("node:timers")
  
  This patch fixes the wasm backend JSFFI prelude script to avoid
  calling `import("node:timers")` on non-deno hosts. Safari doesn't like
  it and would print an error message to the console. Fixes
  https://gitlab.haskell.org/ghc/ghc-wasm-meta/-/issues/13.
  

• 9f02dfb5
  by Simon Peyton Jones at 2024-10-27T15:10:08-04:00

  Add a missing tidy in UnivCo
  
  We were failing to tidy the argument coercions of a UnivCo, which
  led directly to #25391.
  
  The fix is, happily, trivial.
  
  I don't have a small repro case (it came up when building horde-ad,
  which uses typechecker plugins).  It should be possible to make a
  repro case, by using a plugin (which builds a UnivCo) but I decided
  it was not worth the bother. The bug is egregious and easily fixed.
  

• 853050c3
  by Andrew Lelechenko at 2024-10-27T15:10:44-04:00

  Bump text submodule to 2.1.2
  

• 90746a59
  by Andrew Lelechenko at 2024-10-27T15:10:44-04:00

  hadrian: allow -Wunused-imports for text package
  

• 8a6691c3
  by Alan Zimmerman at 2024-10-27T19:44:48+00:00

  EPA: Remove AddEpAnn Commit 8/final
  
  EPA: Remove AddEpAnn from AnnList
  
  EPA: Remove AddEpAnn from GrhsAnn
  
  This is the last actual use
  
  EPA: Remove NameAdornment from NameAnn
  
  Also rework AnnContext to use EpToken, and AnnParen
  
  EPA: Remove AddEpAnn.  Final removal
  
  There are now none left, except for in a large note/comment in
  PostProcess, describing the historical transition to the
  disambiguation infrastructure
  

• d5e7990c
  by Alan Zimmerman at 2024-10-28T21:41:05+00:00

  EPA: Remove AnnKeywordId.
  
  This was used as part of AddEpAnn, and is no longer needed.
  
  Also remove all the haddock comments about which of are attached to
  the various parts of the AST.  This is now clearly captured in the
  appropriate TTG extension points, and the `ExactPrint.hs` file.
  

• e08b8370
  by Serge S. Gulin at 2024-10-29T23:17:01-04:00

  JS: Re-add optimization for literal strings in genApp (fixes #23479)
  
  Based on https://gitlab.haskell.org/ghc/ghc/-/merge_requests/10588/
  
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  Co-authored-by: Andrei Borzenkov <root@sandwitch.dev>
  Co-authored-by: Danil Berestov <goosedb@yandex.ru>
  
  -------------------------
  Metric Decrease:
      T25046_perf_size_gzip
      size_hello_artifact
      size_hello_artifact_gzip
      size_hello_unicode
      size_hello_unicode_gzip
  -------------------------
  

• e3496ef6
  by Cheng Shao at 2024-10-29T23:17:37-04:00

  compiler: remove unused hscDecls/hscDeclsWithLocation
  
  This patch removes unused `hscDecls`/`hscDeclsWithLocation` functions
  from the compiler, to reduce maintenance burden when doing
  refactorings related to ghci.
  

• b1eed26f
  by Cheng Shao at 2024-10-29T23:18:13-04:00

  testsuite: add T25414 test case marked as broken
  
  This commit adds T25414 test case to demonstrate #25414. It is marked
  as broken and will be fixed by the next commit.
  

• e70009bc
  by Cheng Shao at 2024-10-29T23:18:13-04:00

  driver: fix foreign stub handling logic in hscParsedDecls
  
  This patch fixes foreign stub handling logic in `hscParsedDecls`.
  Previously foreign stubs were simply ignored here, so any feature that
  involve foreign stubs would not work in ghci (e.g. CApiFFI). The patch
  reuses `generateByteCode` logic and eliminates a large chunk of
  duplicate logic that implements Core to bytecode generation pipeline
  here. Fixes #25414.
  

• 1d7cd7fe
  by Andreas Klebinger at 2024-10-30T19:14:28-04:00

  Add since tag for -fwrite-if-compression in user guide.
  
  Partial fix for #25395
  

• b349fd1b
  by Alan Zimmerman at 2024-10-30T19:15:04-04:00

  EPA: Remove some unused functions
  

• f859d61c
  by Alan Zimmerman at 2024-10-30T19:15:04-04:00

  EPA: use explicit vertical bar token for ExplicitSum / SumPat
  

• 721ac00d
  by Ben Gamari at 2024-10-31T08:37:38-04:00

  rts/Disassembler: Fix encoding of BRK_FUN instruction
  
  The offset of the CC field was not updated after the encoding change in
  b85b11994e0130ff2401dd4bbdf52330e0bcf776. Fix this.
  
  Fixes #25374.
  

• 0bc94360
  by Alan Zimmerman at 2024-10-31T08:38:15-04:00

  EPA: Bring in last EpToken usages
  
  For import declarations, NameAnnCommas and NPlusKPat.
  
  And remove anchor, it is the same as epaLocationRealSrcSpan.
  

• 0b11cdc0
  by sheaf at 2024-10-31T08:38:55-04:00

  Assert that ctEvCoercion is called on an equality
  
  Calling 'ctEvCoercion' on non-equality constraints is always incorrect.
  We add an assertion to this function to detect such cases; for example
  a type-checking plugin might erroneously do this.
  

• ea458779
  by doyougnu at 2024-11-01T18:11:33-04:00

  ghc-internal: strict, unboxed src loc ranges
  
  - closes: #20449
  - See CLC proposal: #55
  

• 778ac793
  by Kazuki Okamoto at 2024-11-01T18:12:13-04:00

  No haddock markup in doctest line
  

• cf0deeaf
  by Andreas Klebinger at 2024-11-02T17:54:52-04:00

  Reword -fexpose-overloaded-unfoldings docs.
  
  This should make them slightly clearer. Fixes #24844
  
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  

• 1c21e7d4
  by Andreas Klebinger at 2024-11-02T17:55:29-04:00

  Compile T25062 simd tests even if we can't run them.
  
  Helps avoid them being utterly broken.
  
  Fixes #25341
  

• 573cad4b
  by Cheng Shao at 2024-11-02T17:56:04-04:00

  Remove unused USE_REPORT_PRELUDE code paths from the tree
  
  This patch removes unused `USE_REPORT_PRELUDE` code paths from the
  tree. They have been present since the first git revision
  4fb94ae5e5d632748fa2e6c35e259eccc5a1a3f4, and might have been useful
  for debugging purposes many years ago, but these code paths are never
  actually built. Removing these ease maintenance of relevant modules in
  the future, and also allows us to get rid of `CPP` extension in those
  modules as a nice byproduct.
  

• 97f600c6
  by Hassan Al-Awwadi at 2024-11-04T15:52:12+00:00

  Refactored BooleanFormula to be in line with TTG (#21592)
  
  There are two parts to this commit.
  * We moved the definition of BooleanFormula over to L.H.S.BooleanFormula
  * We parameterized the BooleanFormula over the pass
  
  The GHC specific details of BooleanFormula remain in Ghc.Data.BooleanFormula.
  Because its parameterized over the pass its no longer a functor or
  traversable, but we defined bfMap and bfTraverse for the cases where we
  needed fmap and traverse originally. Most other changes are just churn.
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_OneShot
  -------------------------
  

• d4fd3580
  by Andreas Klebinger at 2024-11-05T07:36:16-05:00

  ghc-heap: Fix incomplete selector warnings.
  
  Use utility functions instead of selectors to read partial attributes.
  
  Part of fixing #25380.
  

• fdd9f62a
  by Peter Trommler at 2024-11-05T07:36:51-05:00

  PPC NCG: Implement fmin and fmax
  

• 8e217256
  by Mike Pilgrem at 2024-11-07T04:34:20-05:00

  Re CLC #293 - Don't specify Data.List.NonEmpty in terms of partial
  
  See https://github.com/haskell/core-libraries-committee/issues/293
  
  `List.init` had already been driven out of `tails1` by 21fc180bec93d964a7f4ffdf2429ef6f74b49ab6 but this specification also avoided partial `fromList`, so I preferred it.
  
  The `changelog.md` for `base` is updated, with an entry added under `base-4.22.0.0`.
  

• 346e4cd1
  by Zubin Duggal at 2024-11-07T04:34:57-05:00

  release: copy zip files into the correct directory
  
  Fixes #25446
  

• bbdbe225
  by Zubin Duggal at 2024-11-07T04:34:57-05:00

  release: Sign .gz bindists too
  
  Fixes #25447
  

• 0c722e14
  by Hécate Kleidukos at 2024-11-07T04:35:37-05:00

  hadrian: Enforce the usage of GHC >=9.8.1 for ghci-multi
  
  GHC 9.6 no good when it comes to multi-repl stuff, despite being well
  within the range of n-2 releases for bootstrapping, when the script was
  adapted to load haddock, in !12851
  

• d8f8a1c3
  by Sylvain Henry at 2024-11-07T19:27:46-05:00

  Handle the special ghc-prim:GHC.Prim module in the compiler
  
  Before this patch, some custom hacks were necessary in ghc-prim's
  Setup.hs to register the GHC.Prim (virtual) module and in Hadrian to
  generate haddocks properly.
  
  In this patch we special-case this module in the compiler itself instead
  (which it already is, see ghcPrimIface in GHC.Iface.Load). From
  Cabal/Hadrian's perspective GHC.Prim is now just a normal autogenerated
  module.
  
  This simplification is worthwhile on its own. It was found while looking
  into the work needed for #24453 which aims to merge ghc-prim,
  ghc-bignum, and ghc-internal. It's also one step closer to remove
  ghc-prim's custom setup.
  

• a55adc8e
  by Cheng Shao at 2024-11-07T19:28:22-05:00

  Clean up obsolete CPP guarded code paths from the tree
  
  This patch cleans up obsolete CPP guarded code paths from the tree.
  The minimum supported boot GHC version is 9.6, and all the pre-9.6 era
  code paths can be removed.
  

• 9ede97f3
  by Cheng Shao at 2024-11-07T19:28:58-05:00

  Remove obsolete executable wrappers from the tree
  
  The executable wrappers are handled by hadrian and bindist Makefile.
  The various .wrapper scripts in the tree are unused since removal of
  Make build system, so this patch removes them all.
  

• 7d42b2df
  by tristian at 2024-11-07T19:29:40-05:00

  TcRnDuplicateDecls now suggests to use the DuplicateRecordFields extension.
  
  Fixes: !24627
  

• e56ed179
  by Zubin Duggal at 2024-11-11T15:16:35+05:30

  testsuite: normalise some versions in callstacks
  
  (cherry picked from commit f230e29f30d0c1c566d4dd251807fcab76a2710e)
  

• a28fc903
  by Zubin Duggal at 2024-11-11T15:16:35+05:30

  testsuite: use -fhide-source-paths to normalise some backpack tests
  
  (cherry picked from commit b19de476bc5ce5c7792e8af1354b94a4286a1a13)
  

• ed16d303
  by Zubin Duggal at 2024-11-11T15:16:36+05:30

  testsuite/haddock: strip version identifiers and unit hashes from html tests
  
  (cherry picked from commit fbf0889eadc410d43dd5c1657e320634b6738fa5)
  

• e45e5836
  by Zubin Duggal at 2024-11-11T15:16:36+05:30

  haddock: oneshot tests can drop files if they share modtimes. Stop this by
  including the filename in the key.
  
  Ideally we would use `ghc -M` output to do a proper toposort
  
  Partially addresses #25372
  
  (cherry picked from commit e78c7ef96e395f1ef41f04790aebecd0409b92b9)
  

• 9104e6eb
  by Zubin Duggal at 2024-11-11T15:16:36+05:30

  testsuite: fix normalisation of T9930fail so that it doesn't get tripped up by ghc executable (ARGV[0]) differences
  
  (cherry picked from commit a79a587e025d42d34bb30e115fc5c7cab6c1e030)
  

• 2c31264a
  by Zubin Duggal at 2024-11-11T15:16:36+05:30

  testsuite: normalise windows file seperators
  
  (cherry picked from commit f858875e03b9609656b542aaaaff85ad0a83878a)
  

• 2807f91b
  by Zubin Duggal at 2024-11-11T15:21:30+05:30

  testsuite: Also match <VERSION> placeholders when normalising callsites
  

• c02add17
  by Ben Gamari at 2024-11-12T01:22:11-05:00

  configure: Check version number validity
  
  Here we verify the previously informal invariant that stable release
  version numbers must have three components, preventing costly failed
  releases.
  
  Specifically, the check fails in the following scenarios:
  
   * `version=9.13` while `RELEASE=YES` since this would imply a
     release made from an unstable branch
   * `version=9.13.0` since unstable versions should only have two
     components
   * `version=9.12` since this has the wrong number of version components
     for a stable branch
  
  Fixes #25390.
  

• 747fd322
  by Teo Camarasu at 2024-11-12T01:22:49-05:00

  docs: link to #14474 in the template-haskell docs
  

• 6d96bb62
  by Zubin Duggal at 2024-11-12T01:23:25-05:00

  testsuite: normalise execvp vs exec differences in process tests
  
  Fixes #25431
  

• 502e6711
  by Torsten Schmits at 2024-11-12T01:24:01-05:00

  fix test lint that accumulated while the checks were broken
  
  I didn't fix the issues flagged by the #ifdef linter because it were so
  many that it seemed like the rule has become obsolete.
  

• 223a4cb5
  by Torsten Schmits at 2024-11-12T01:24:02-05:00

  test driver: fix file collection for regex linters
  
  When a testsuite linter is executed with the `tracked` strategy, the
  driver runs `git ls-tree` to collect eligible files.
  
  This appears to have ceased producing any paths – `ls-tree` restricts
  its results to the current working directory, which is
  `testsuite/tests/linters` in this case.
  
  As a quick fix, this patch changes the working directory to match
  expectations.
  

• 9ad9ac63
  by Alan Zimmerman at 2024-11-12T01:24:39-05:00

  EPA: Capture location of '_' for wild card type binder
  
  And keep track of promotion status in HsExplicitTupleTy, so the
  round-trip ppr test works for it.
  
  Updates Haddock output too, using the PromotionFlag in
  HsExplicitTupleTy.
  
  Closes #25454
  

• c37b96fa
  by Cheng Shao at 2024-11-12T01:25:15-05:00

  wasm: fix setImmediate() implementation for Cloudflare Workers
  
  This patch fixes setImmediate() implementation for Cloudflare Workers
  in the wasm backend's js prelude script. Cloudflare Workers doesn't
  support the MessageChannel API, and we use a setTimeout() based
  fallback implementation in this case.
  

• bea8ea4c
  by Cheng Shao at 2024-11-12T01:25:15-05:00

  wasm: fix FinalizationRegistry logic for Cloudflare Workers
  
  This patch fixes FinalizationRegistry related logic for Cloudflare
  Workers in wasm backend js post linker. Cloudflare Workers doesn't
  support FinalizationRegistry, in this case we use a dummy
  implementation that doesn't do anything.
  

• 00d551bf
  by Cheng Shao at 2024-11-13T08:48:21-05:00

  Remove obsolete cross-port script
  
  This patch removes the obsolete cross-port script in the tree. The
  script was based on the legacy Make build system which has been pruned
  from the tree long ago. For hadrian, proper support for two-stage
  bootstrapping onto a new unsupported platform is a work in progress in
  !11444.
  

• 75a2eae4
  by Cheng Shao at 2024-11-13T08:48:58-05:00

  hadrian: fix bindist makefile for wasm32-wasi target
  
  This patch fixes one incoherent place between bindist makefile and
  hadrian logic: I forgot to include wasi/wasm32 in
  OsSupportsGHCi/ArchSupportsGHCi as well. And this results in incorrect
  settings file generated after installing the bindist, and "Use
  interpreter"/"Have interpreter" fields incorrectly have "NO" values
  where they should be "YES" like --info output of in-tree version.
  

• 0614abef
  by Alan Zimmerman at 2024-11-13T08:49:34-05:00

  EPA: Correctly capture leading semis in decl list
  
  Closes #25467
  

• 00d58ae1
  by Sebastian Graf at 2024-11-13T15:21:23-05:00

  DmdAnal: Make `prompt#` lazy (#25439)
  
  This applies the same treatment to `prompt#` as for `catch#`.
  See `Note [Strictness for mask/unmask/catch/prompt]`.
  
  Fixes #25439.
  

• 93233a66
  by Ben Gamari at 2024-11-13T15:21:59-05:00

  boot: Do not attempt to update config.sub
  
  While Apple ARM hardware was new we found that the autoconf scripts
  included in some boot packages were too old. As a mitigation for this,
  we introduced logic in the `boot` script to update the `config.sub`
  with that from the GHC tree. However, this causes submodules which
  have `config.sub` committted to appear to be dirty. This is a
  considerable headache.
  
  Now since `config.sub` with full platform support is more common we can
  remove `boot`'s `config.sub` logic.
  
  Fixes #19574.
  

• fa66fa64
  by Ryan Scott at 2024-11-14T19:05:00-05:00

  Add regression test for #16234
  
  Issue #16234 was likely fixed by !9765. This adds a regression test to ensure
  that it remains fixed.
  
  Fixes #16234.
  

• bfe64df8
  by Matthew Pickering at 2024-11-14T19:05:36-05:00

  ghc-internal: Update to Unicode 16
  
  This patch updates the automatically generated code for querying unicode
  properties to unicode 16.
  
  Fixes #25402
  

• 1fd83f86
  by Ben Gamari at 2024-11-14T19:06:13-05:00

  configure: Accept happy-2.1.2
  
  happy-2.1 was released in late Oct 2024. I have confirmed that master
  bootstraps with it. Here we teach configure to accept this tool.
  
  Fixes #25438.
  

• aa58fc5b
  by Ben Gamari at 2024-11-14T19:06:49-05:00

  rts: Tighten up invariants of PACK
  

• 8aa4c10a
  by Ben Gamari at 2024-11-14T19:06:49-05:00

  testsuite: Fix badly escaped literals
  
  Use raw string literals to ensure that `\s` is correctly interpreted as
  a character class.
  

• 0e084029
  by Ben Gamari at 2024-11-14T19:06:49-05:00

  rts: Improve documentation of SLIDE bytecode instruction
  

• 9bf3663b
  by Ben Gamari at 2024-11-14T19:06:49-05:00

  rts/Interpreter: Assert that TEST*_P discriminators are valid
  

• 1f668511
  by Ben Gamari at 2024-11-14T19:06:49-05:00

  rts/Interpreter: Improve documentation of TEST*_P instructions
  

• 59e0a770
  by Cheng Shao at 2024-11-14T19:07:25-05:00

  misc: improve clangd compile_flags.txt flags
  
  This patch improves the compile_flags.txt config used to power clangd
  for the rts C codebase. The flags in the file are sampled & deduped
  from a real stage1 build with clang-19 and vastly improves the IDE
  accuracy when hacking the rts.
  
  For maximum code coverage under the default settings,
  compile_flags.txt defaults to threaded+profiled+dynamic+debug way.
  This does not mean profdyn needs to be actually built in _build/stage1
  for IDE to work. To activate IDE for other RTS ways, simply remove one
  of the -D flags at the end of compile_flags.txt and restart clangd.
  

• c2c562e0
  by Ben Gamari at 2024-11-14T19:08:01-05:00

  testsuite: Don't consider untracked files in dirtiness check
  
  Considering trees containing untracked files as dirty is a bridge too
  far. The chance of an untracked file significantly affecting measured
  performanced metrics is quite small whereas not collecting measurements
  is quite inconvenient for some workflows. We now ignore untracked files
  in the dirtiness check.
  
  Fixes #25471.
  

• ed2ed6c5
  by Cheng Shao at 2024-11-14T19:08:37-05:00

  testsuite: add regression test T25473
  
  This commit adds regression test T25473 marked as broken due to #25473.
  It will be fixed in the subsequent commit.
  

• bd0a8b7e
  by Cheng Shao at 2024-11-14T19:08:37-05:00

  wasm: fix foreign import javascript "wrapper" in TH/ghci
  
  This patch fixes foreign import javascript "wrapper" in wasm backend's
  TH/ghci by fixing the handling of dyld/finalization_registry magic
  variables. Fixes T25473 and closes #25473.
  

• f1b0bc32
  by Ben Gamari at 2024-11-14T19:09:13-05:00

  rts/linker: Make FreeBSD declarations proper prototypes
  
  The iconv declarations for FreeBSD were previously not prototypes,
  leading to warnings.
  

• 086cbbc1
  by Ben Gamari at 2024-11-14T19:09:13-05:00

  base: Drop redundant import in FreeBSD ExecutablePath implementation
  

• 79ecd199
  by Ben Gamari at 2024-11-14T19:09:13-05:00

  compiler: Fix partial selector warnings in GHC.Runtime.Heap.Inspect
  

• 1acb73bf
  by Andrew Lelechenko at 2024-11-15T06:10:47-05:00

  gitlab: mention CLC in MR template
  

• 8f2e0832
  by Ben Gamari at 2024-11-15T06:11:24-05:00

  rts: Allow use of GNU-stack notes on FreeBSD
  
  Previously we gated use of GNU-style non-executable stack notes to only
  apply on Linux. However, these are also supported by FreeBSD, which also
  uses ELF. Fix this.
  
  Fixes #25475.
  

• 2c427cb0
  by Ben Gamari at 2024-11-16T05:27:40-05:00

  rts: Fix EINTR check in timerfd ticker
  
  When `poll` failed we previously checked that `errno == -EINTR` to
  silence the failure warning. However, this is wrong as `errno` values
  are generally not negated error codes (in contrast to many system call
  results, which is likely what the original author had in mind).
  
  Fixes #25477.
  

• a0fa4941
  by Ben Gamari at 2024-11-16T05:28:16-05:00

  rts: Increase gen_workspace alignment to 128 bytes on AArch64
  
  Increase to match the 128-byte cache-line size of Apple's ARMv8
  implementation.
  
  Closes #25459.
  

• 142d8afa
  by Ben Gamari at 2024-11-16T16:20:47-05:00

  rts/RtsFlags: Refactor size parsing
  
  This makes a number of improvements mentioned in #20201:
  
   * fail if the argument cannot be parsed as a number (`-Mturtles`)
   * fail if an unrecognized unit is given (e.g. `-M1x`)
  

• b7a146e5
  by Ben Gamari at 2024-11-16T16:20:47-05:00

  testsuite: Add tests for RTS flag parsing error handling
  
  See #20201.
  

• ddb7afa6
  by Ben Gamari at 2024-11-16T16:21:23-05:00

  users guide: Mention language extensions in equality constraints discussion
  
  As suggested in #24127, mention the language extensions necessary for
  usage of equality constriants in their documentation.
  
  Closes #24127.
  

• 36133dac
  by Ben Gamari at 2024-11-16T16:21:23-05:00

  users-guide/9.14.1-notes: Fix list syntax
  

• 888de658
  by Ben Gamari at 2024-11-16T16:21:23-05:00

  users-guide/debug-info: Fix duplicate flag descriptions
  

• f120e427
  by Ben Gamari at 2024-11-16T16:21:23-05:00

  users-guide: Fix reference to 9.14.1 release notes
  

• 8e975032
  by Ben Gamari at 2024-11-16T16:21:59-05:00

  Introduce GHC.Tc.Plugin.lookupTHName
  
  This makes it significantly more convenient (and less
  GHC-version-dependent) to resolve a template-haskell name into a GHC
  Name.
  
  As proposed in #24741.
  

• a0e168ec
  by ARATA Mizuki at 2024-11-16T16:22:40-05:00

  x86 NCG SIMD: Lower packFloatX4#, insertFloatX4# and broadcastFloatX4# to SSE1 instructions
  
  Fixes #25441
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• 3936bf1b
  by sheaf at 2024-11-16T16:23:22-05:00

  X86 NCG: allow VXOR at scalar floating-point types
  
  The NCG can emit VXOR instructions at scalar floating-point types,
  but the pretty-printer would panic instead of emitting the appropriate
  VXORPS/VXORPD instructions. This patch rectifies that oversight.
  
  Fixes #25455
  

• d9dff93a
  by Ben Gamari at 2024-11-16T16:23:58-05:00

  rts: Fix platform-dependent pointer casts
  
  Previously we had unnecessary (and incorrect) platform-dependent casts
  to turn `OSThreadIds`s into a integer. We now just uniformly cast first
  to a `uintptr_t` (which is always safe, regardless of whether
  `OSThreadId` is a pointer), and then cast to the desired integral type.
  
  This fixes a warning on musl platforms.
  

• 6d95cdb8
  by Ben Gamari at 2024-11-16T16:24:34-05:00

  testsuite: Mark encoding004 as broken on FreeBSD
  
  Due to #22003, CP936 fails to roundtrip:
  ```diff
   == CP936
  +Failed to roundtrip given mutant byte at index 891 (251 /= 123 at index 891)
  +Failed to roundtrip given mutant byte at index 1605 (197 /= 69 at index 1605)
  +Failed to roundtrip given mutant byte at index 2411 (235 /= 107 at index 2411)
  +Failed to roundtrip given mutant byte at index 6480 (208 /= 80 at index 6480)
  +Failed to roundtrip given mutant byte at index 6482 (210 /= 82 at index 6482)
  +Failed to roundtrip given mutant byte at index 6484 (212 /= 84 at index 6484)
  +Failed to roundtrip given mutant byte at index 6496 (224 /= 96 at index 6496)
  +Failed to roundtrip given mutant byte at index 7243 (203 /= 75 at index 7243)
  +Failed to roundtrip given mutant byte at index 7277 (237 /= 109 at index 7277)
  +Failed to roundtrip given mutant byte at index 8027 (219 /= 91 at index 8027)
  +Failed to roundtrip given mutant byte at index 8801 (225 /= 97 at index 8801)
  ```
  

• 26e86984
  by Ben Gamari at 2024-11-18T04:05:31-05:00

  hadrian: Allow haddock options to be passed via key-value settings
  

• 6e68b117
  by Matthew Pickering at 2024-11-18T04:06:07-05:00

  Exception rethrowing
  
  Basic changes:
  
  * Change `catch` function to propagate exceptions using the
    WhileHandling mechanism.
  * Introduce `catchNoPropagate`, which does the same as before, but
    passes an exception which can be rethrown.
  * Introduce `rethrowIO` combinator, which rethrows an exception with a
    context and doesn't add a new backtrace.
  * Introduce `tryWithContext` for a variant of `try` which can rethrow
    the exception with it's original context.
  * onException is modified to rethrow the original error rather than
    creating a new callstack.
  * Functions which rethrow in GHC.Internal.IO.Handle.FD,
    GHC.Internal.IO.Handle.Internals, GHC.Internal.IO.Handle.Text, and
    GHC.Internal.System.IO.Error are modified to not add a new callstack.
  
  Implements CLC proposal#202 <https://github.com/haskell/core-libraries-committee/issues/202>
  

• a4e0d235
  by Rodrigo Mesquita at 2024-11-18T04:06:07-05:00

  exceptions: Improve the message layout as per #285
  
  This commit fixes the layout of the additional information included when
  displaying an exception, namely the type of the exception.
  
  It also fixes the default handler's heading message to work well
  together with the improved display message of SomeException.
  
  CLC proposal#285
  

• 284ffab3
  by Rodrigo Mesquita at 2024-11-18T04:06:07-05:00

  Display type and callstack of exception on handler
  
  This commit changes the Exception instance of SomeException to *simply*
  display the underlying exception in `displayException`. The augmented
  exception message that included the type and backtrace of the exception
  are now only printed on a call to `displayExceptionWithInfo`.
  
  At a surface level, existing programs should behave the same since the
  `uncaughtExceptionHandler`, which is responsible for printing out uncaught
  exceptions to the user, will use `displayExceptionWithInfo` by default.
  
  However, unlike the instance's `displayException` method, the
  `uncaughtExceptionHandler` can be overriden with
  `setUncaughtExceptionHandler`. This makes the extra information opt-in
  without fixing it the instance, which can be valuable if your program
  wants to display uncaught exceptions to users in a user-facing way
  (ie without backtraces).
  
  This is what was originally agreed for CLC#231 or CLC#261 with regard to
  the type of the exception information.
  
  The call stack also becoming part of the default handler rather than the
  Exception instance is an ammendment to CLC#164.
  
  Discussion of the ammendment is part of CLC#285.
  

• 36cddd2c
  by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00

  Remove redundant CallStack from exceptions
  
  Before the exception backtraces proposal was implemented, ErrorCall
  accumulated its own callstack via HasCallStack constraints, but
  ExceptionContext is now accumulated automatically.
  
  The original ErrorCall mechanism is now redundant and we get a duplicate
  CallStack
  
  Updates Cabal submodule to fix their usage of ErrorCallWithLocation to ErrorCall
  
  CLC proposal#285
  
  Fixes #25283
  

• 7a74330b
  by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00

  Freeze call stack in error throwing functions
  
  CLC proposal#285
  

• 3abf31a4
  by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00

  De-duplicate displayContext and displayExceptionContext
  
  The former was unused except for one module where it was essentially
  re-defining displayExceptionContext.
  
  Moreover, this commit extends the fix from
  bfe600f5bb3ecd2c8fa71c536c63d3c46984e3f8 to displayExceptionContext too,
  which was missing.
  

• c0d783f8
  by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00

  Re-export NoBacktrace from Control.Exception
  
  This was originally proposed and accepted in section
      "2.7   Capturing Backtraces on Exceptions"
  of the CLC proposal for exception backtraces.
  
  However, the implementation missed this re-export, which this commit now
  fixes.
  

• 802b5c3e
  by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00

  Fix exception backtraces from GHCi
  
  When running the program with `runhaskell`/`runghc` the backtrace should
  match the backtrace one would get by compiling and running the program.
  But currently, an exception thrown in a program interpreted with
  `runhaskell` will:
  
      * Not include the original exception backtrace at all
      * Include the backtrace from the internal GHCi/ghc rethrowing of the
        original exception
  
  This commit fixes this divergence by not annotating the ghc(i) backtrace
  (with NoBacktrace) and making sure that the backtrace of the original
  exception is serialized across the boundary and rethrown with the
  appropriate context.
  
  Fixes #25116
  
  The !13301 MR (not this commit in particular) improves performance of
  MultiLayerModules. Unfortunately, T3294 regresses on aarch64-linux-deb12
  by 1% allocations. Since this patch must be merged for 9.12 ASAP, we
  will not be able to investigate the slight regression on this platform
  in time.
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesRecomp
      MultiLayerModulesTH_OneShot
  Metric Increase:
      T3294
  -------------------------
  

• 3e89eb65
  by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00

  base: Add to changelog.md CLC #285
  

• d9326a48
  by Rodrigo Mesquita at 2024-11-18T04:06:08-05:00

  Bump array and stm submodules for testsuite
  
  The testsuites of array and stm had to be updated according to !13301.
  
  Updates submodule array and stm.
  

• 325fcb5d
  by Ben Gamari at 2024-11-18T04:06:45-05:00

  rts/adjustor: Clean up code style of Nativei386 adjustor
  

• 39bb6e58
  by Ben Gamari at 2024-11-18T04:06:45-05:00

  rts/adjustor: Fix stack overrun error in Nativei386 adjustor
  
  We were reserving the wrong kind of adjustor context (the generic
  `AdjustorContext` used by other adjustor implementations, rather than
  the i386-specific `CCallContext`) to return the adjustor context while
  freeing, resulting in #25485.
  
  Fixes #25485.
  

• 831aab22
  by sheaf at 2024-11-18T21:22:36-05:00

  Include diagnostic reason in -fdiagnostics-as-json
  
  This commit ensures that the -fdiagnostics-as-json output includes the
  diagnostic reason. This allows the full error message produced by GHC
  to be re-constructed from the JSON output.
  
  Fixes #25403
  

• 3e5bfdd3
  by Ben Gamari at 2024-11-18T21:23:12-05:00

  rts: Introduce printIPE
  
  This is a convenience utility for use in GDB.
  

• 44d909a3
  by Sjoerd Visscher at 2024-11-19T14:38:24-05:00

  Don't store boot locations in finder cache
  
  Partially reverts commit fff55592a7b
  
  Amends add(Home)ModuleToFinder so that locations for boot files are not stored in the finder cache.
  
  Removes InstalledModule field from InstalledFound constructor since it's the same as the key that was searched for.
  

• 64c95292
  by Sjoerd Visscher at 2024-11-19T14:38:24-05:00

  Concentrate boot extension logic in Finder
  
  With new mkHomeModLocation that takes an extra HscSource to add boot extensions if required.
  

• 11bad98d
  by ARATA Mizuki at 2024-11-19T14:39:08-05:00

  Better documentation for floating-point min/max and SIMD primitives
  
  See #25350 for floating-point min/max
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• 791a47b2
  by Arnaud Spiwack at 2024-11-20T14:00:05+00:00

  Add test for #25185
  

• 374e18e5
  by Arnaud Spiwack at 2024-11-20T14:09:30+00:00

  Quick look: emit the multiplicity of app heads in tcValArgs
  
  Otherwise it's not scaled properly by the context, allowing unsound
  expressions.
  
  Fixes #25185.
  

• 1fc02399
  by sheaf at 2024-11-20T18:11:03-05:00

  x86 NCG: fix regUsageOfInstr for VMOVU & friends
  
  This commit fixes the implementation of 'regUsageOfInstr' for vector
  operations that take an 'Operand' as the destination, by ensuring that
  when the destination is an address then the address should be *READ*,
  and not *WRITTEN*.
  
  Getting this wrong is a disaster, as it means the register allocator
  has incorrect information, which can lead to it discard stores to
  registers, segfaults ensuing.
  
  Fixes #25486
  

• 7bd407a6
  by Brandon Chinn at 2024-11-21T14:08:15-05:00

  Fix CRLF in multiline strings (#25375)
  

• 7575709b
  by Rodrigo Mesquita at 2024-11-21T14:08:52-05:00

  Improve reachability queries on ModuleGraph
  
  Introduces `ReachabilityIndex`, an index constructed from a
  `GHC.Data.Graph.Directed` `Graph` that supports fast reachability
  queries (in $O(1)$). This abstract data structure is exposed from
  `GHC.Data.Graph.Directed.Reachability`.
  
  This index is constructed from the module graph nodes and cached in
  `ModuleGraph`, enabling efficient reachability queries on the module
  graph. Previously, we'd construct a Map of Set of ModuleGraph nodes
  which used a lot of memory (`O(n^2)` in the number of nodes) and cache
  that in the `ModuleGraph`. By using the reachability index we get rid of
  this space leak in the module graph -- even though the index is still
  quadratic in the number of modules, it is much, much more space
  efficient due to its representation using an IntMap of IntSet as opposed
  to the transitive closure we previously cached.
  
  In a memory profile of MultiLayerModules with 100x100 modules, memory
  usage improved from 6GB residency to 2.8GB, out of which roughly 1.8GB
  are caused by a second space leak related to ModuleGraph. On the same
  program, it brings compile time from 7.5s to 5.5s.
  
  Note how we simplify `checkHomeUnitsClosed` in terms of
  `isReachableMany` and by avoiding constructing a second graph with the
  full transitive closure -- it suffices to answer the reachability query
  on the full graph without collapsing the transitive closure completely
  into nodes.
  
  Unfortunately, solving this leak means we have to do a little bit more
  work since we can no longer cache the result of turning vertex indices
  into nodes. This results in a slight regression in MultiLayerModulesTH_Make,
  but results in large performance and memory wins when compiling large
  amounts of modules.
  
  -------------------------
  Metric Decrease:
      mhu-perf
  Metric Increase:
      MultiLayerModulesTH_Make
  -------------------------
  

• bcbcdaaf
  by Cheng Shao at 2024-11-21T14:09:28-05:00

  driver: fix hpc undefined symbol issue in TH with -fprefer-byte-code
  
  This commit fixes an undefined symbol error in RTS linker when
  attempting to compile home modules with -fhpc and
  -fbyte-code-and-object-code/-fprefer-byte-code, see #25510 for
  detailed description and analysis of the bug.
  
  Also adds T25510/T25510c regression tests to test make mode/oneshot
  mode of the bug.
  

• 970ada5a
  by Ben Gamari at 2024-11-22T23:32:06-05:00

  gitlab-ci: Bump ci-images
  
  For introduction of Alpine/i386 image.
  
  Thanks to Julian for the base image.
  
  Co-Authored-By: Julian Ospald <hasufell@hasufell.de>
  

• 8115abc2
  by Ben Gamari at 2024-11-22T23:32:06-05:00

  gitlab-ci: Add release job for i386/Alpine
  
  As requested by Mikolaj and started by Julian.
  
  Co-Authored-By: Julian Ospald <hasufell@hasufell.de>
  

• 639f0149
  by Ben Gamari at 2024-11-22T23:32:06-05:00

  rts/linker/Elf: Resolve _GLOBAL_OFFSET_TABLE_
  

• 490d4d0a
  by Ben Gamari at 2024-11-22T23:32:06-05:00

  gitlab-ci: Mark i386 Alpine test breakages
  
  Marks the following tests as broken on i386/Alpine:
  
   * T22033 due to #25497
   * simd009, T25062_V16, T25169, T22187_run due to #25498
  

• 536cdf09
  by Cheng Shao at 2024-11-22T23:32:42-05:00

  compiler: remove unused GHC.Linker.Loader.loadExpr
  
  This patch removes the unused `GHC.Linker.Loader.loadExpr` function.
  It was moved from `GHC.Runtime.Linker.linkExpr` in `ghc-9.0` to
  `GHC.Linker.Loader.loadExpr` in `ghc-9.2`, and remain completely
  unused and untested ever since. There's also no third party user of
  this function to my best knowledge, so let's remove this. Anyone who
  wants to write their own GHC API function to load bytecode can consult
  the source code in older release branches.
  

• 6ee35024
  by Drew Fenwick at 2024-11-22T23:33:26-05:00

  Fix a non-compiling example in the type abstractions docs
  
  This patch adds a missing Show constraint to a code example in the User Guide's type abstractions docs to fix issue #25422.

• d1172e20
  by Rodrigo Mesquita at 2024-11-22T23:34:02-05:00

  Re-introduce ErrorCallWithLocation with a deprecation pragma
  
  With the removal of the duplicate backtrace, part of CLC proposal #285,
  the constructor `ErrorCallWithLocation` was removed from base.
  
  This commit re-introduces it with a deprecation.
  

• 1187a60a
  by Ben Gamari at 2024-11-22T23:34:39-05:00

  testsuite: Skip tests requiring Hadrian deps in out-of-tree testsuite runs
  
  Some testsuite tests require specific tools (e.g. `check-ppr` and
  `check-exact`) beyond those shipped in the binary distribution. Skip
  these tests.
  
  Fixes #13897.
  

• c37d7a2e
  by Ben Gamari at 2024-11-22T23:34:39-05:00

  testsuite: Declare exactprint tests' dependency on check-exact
  

• 454ce957
  by Ben Gamari at 2024-11-22T23:35:15-05:00

  ghc-internal: Fix a few cases of missing Haddock markup
  

• a249649b
  by Ben Gamari at 2024-11-22T23:35:51-05:00

  testsuite/GHCiPrimCall : Add missing Makefile includes
  

• a021a493
  by Ben Gamari at 2024-11-22T23:35:51-05:00

  testsuite/IpeStats: Use Make rather than shell interpolation
  

• 6e1fbda7
  by Ben Gamari at 2024-11-25T03:55:44-05:00

  hadrian-ghci-multi: Pass -this-package-name in unit response files
  
  As noted in #25509, the `-this-package-name` must be passed for each
  package to ensure that GHC can response references to the packages'
  exposed modules via package-qualified imports. Fix this.
  
  Closes #25509.
  

• a05e4a9b
  by Simon Hengel at 2024-11-25T03:56:33-05:00

  Refactoring: Use `OnOff` more consistently for `Extension`
  

• 7536181d
  by Matthew Pickering at 2024-11-25T14:00:07-05:00

  driver: Always link against "base" package when one shot linking
  
  The default value for base-unit-id is stored in the settings file.
  
  At install time, this can be set by using the BASE_UNIT_ID environment
  variable.
  
  At runtime, the value can be set by `-base-unit-id` flag.
  
  For whether all this is a good idea, see #25382
  
  Fixes #25382
  

• 7f90f319
  by Andreas Klebinger at 2024-11-25T14:00:44-05:00

  Compacting GC: Handle black holes in large objects.
  
  As #14497 showed black holes can appear inside large objects when
  we capture a computation and later blackhole it like we do for AP_STACK
  closures.
  
  Fixes #24791
  

• 291388e1
  by Cheng Shao at 2024-11-25T14:01:19-05:00

  ci: minor nix-in-docker improvements
  
  This patch makes some minor improvements re nix-in-docker logic in the
  ci configuration:
  
  - Update `nixos/nix` to the latest version
  - Apply $CPUS to `cores`/`max-jobs` to avoid oversubscribing while
    allowing a reasonable degree of parallelism
  - Remove redundant `--extra-experimental-features nix-command` in
    later `nix shell` invocations, it's already configured in
    `/etc/nix/nix.conf`
  

• e684c406
  by Cheng Shao at 2024-11-25T14:01:57-05:00

  ci: avoid depending on stack job for test-bootstrap jobs
  
  This patch makes test-bootstrap related ci jobs only depend on
  hadrian-ghc-in-ghci job to finish, consistent with other jobs in the
  full-build stage generated by gen_ci.hs. This allows the jobs to be
  spawned earlier and improve overall pipeline parallelism.
  

• caaf5388
  by Simon Hengel at 2024-11-25T14:02:41-05:00

  Refactoring: Remove `pSupportedExts` from `ParserOpts`
  
  This is never used for lexing / parsing.  It is only used by
  `GHC.Parser.Header.getOptions`.
  

• 41f8365c
  by Arnaud Spiwack at 2024-11-25T14:03:23-05:00

  Add test for #25515
  

• 9279619f
  by Arnaud Spiwack at 2024-11-25T14:03:23-05:00

  Desugar record notation with correct multiplicities
  
  Simply uses the multiplicity as stored in the field. As I'm writing
  this commit, the only possible multiplicity is 1, but !13525 is
  changing this. It's actually easier to take !13525 into account.
  
  Fixes #25515.
  

• fcc3ae6e
  by Andreas Klebinger at 2024-11-26T08:24:58-05:00

  Clarify INLINE unfolding optimization docs.
  
  Fixes #24660
  

• 88c4fe1d
  by Cheng Shao at 2024-11-26T08:25:34-05:00

  rts: remove -Wl,-U,___darwin_check_fd_set_overflow hack
  
  This patch bumps macOS minimum SDK version to 11.0 for x86_64-darwin
  to align it with aarch64-darwin. This allows us to get rid of the
  horrible -Wl,-U,___darwin_check_fd_set_overflow hack, which is causing
  linker warnings and testsuite failures on macOS 15. Fixes #25504.
  

• 53f978c0
  by doyougnu at 2024-11-26T16:07:26-05:00

  ghc-experimental: expose GHC.RTS.Flags, GHC.Stats
  
  See this CLC proposal:
  
  - https://github.com/haskell/core-libraries-committee/issues/289
  
  and this CLC proposal for background:
  
  - https://github.com/haskell/core-libraries-committee/issues/288
  
  Metric Decrease:
      MultiLayerModulesTH_OneShot
  

• e70d4140
  by Wang Xin at 2024-11-26T16:08:10-05:00

  Add -mcmodel=medium moduleflag to generated LLVM IR on LoongArch platform
  
  With the Medium code model, the jump range of the generated jump
  instruction is larger than that of the Small code model. It's a
  temporary fix of the problem descriped in https://gitlab.haskell
  .org/ghc/ghc/-/issues/25495. This commit requires that the LLVM
  used contains the code of commit 9dd1d451d9719aa91b3bdd59c0c6679
  83e1baf05, i.e., version 8.0 and later. Actually we should not
  rely on LLVM, so the only way to solve this problem is to implement
  the LoongArch backend.
  
  Add new type for codemodel
  

• df42ba16
  by Andreas Klebinger at 2024-11-27T11:40:49-05:00

  Cmm constant folding: Narrow results to operations bitwidth.
  
  When constant folding ensure the result is still within bounds
  for the given type by explicitly narrowing the results.
  
  Not doing so results in a lot of spurious assembler warnings
  especially when testing primops.
  

• bf3db97e
  by Ben Gamari at 2024-11-27T11:41:26-05:00

  ghc-toolchain: Introduce basic flag validation
  
  We verify that required flags (currently `--output` and `--triple`) are
  provided. The implementation is truly awful, but so is getopt.
  
  Begins to address #25500.
  

• a104508d
  by Ben Gamari at 2024-11-27T11:42:03-05:00

  rts: Allow ExecPage to allocate anywhere in address space
  
  Currently the ExecPage facility has two users:
  
   * GHCi, for constructing info tables, and
   * the adjustor allocation path
  
  Despite neither of these have any spatial locality constraints ExecPage
  was using the linker's `mmapAnonForLinker`, which tries hard to ensure
  that mappings end up nearby the executable image. This makes adjustor
  allocation needlessly subject to fragmentation concerns.
  
  We now instead return less constrained mappings, improving the
  robustness of the mechanism.
  
  Addresses #25503.
  

• c3fc9b86
  by Ben Gamari at 2024-11-27T11:42:39-05:00

  base: Fix incorrect mentions of GHC.Internal.Numeric
  
  These were incorrectly changed by the automated refactoring of the
  `ghc-internal` migration.
  
  Fixes #25521.
  

• a362b943
  by sheaf at 2024-11-27T23:44:28-05:00

  Add checkExact to toolTargets
  
  This change means that the Hadrian multi target will include exactprint.
  In particular, this means that HLS will work on exactprint inside the GHC tree.

• e6c957e4
  by Arnaud Spiwack at 2024-11-27T23:45:09-05:00

  Add test for #25428
  

• 52d97f4e
  by Arnaud Spiwack at 2024-11-27T23:45:09-05:00

  Don't bypass MonoLocalBind in empty patterns
  
  Fixes #25428
  

• 7890f2d8
  by Ben Gamari at 2024-11-28T10:26:46-05:00

  hadrian: Bump directory bound to >=1.3.9
  
  Earlier versions of `directory` are racy on Windows due to #24382.
  
  Also includes necessary Hadrian bootstrap plan bump.
  
  Fixes #24382.
  

• 0fd43ea6
  by Adam Sandberg Ericsson at 2024-11-28T10:27:22-05:00

  mention -Iw in +RTS -?

• 6cf579b9
  by Ben Gamari at 2024-11-28T10:27:59-05:00

  gitlab-ci: Set GIT_SUBMODULE_FORCE_HTTPS
  
  GitLab recommends using `https://` to clone submodules and provides the
  `GIT_SUBMODULE_FORCE_HTTPS` variable to force this.
  
  Fixes #25528.
  

• 5b4774f9
  by sheaf at 2024-12-03T15:22:07+01:00

  Remove TcRnDeprecatedInvisTyArgInConPat mechanism
  
  The combination of ScopedTypeVariables + TypeApplications now no longer
  enables the use of type applications in constructor patterns, as per
  GHC proposal #448.
  
  This completes the deprecation that begun with GHC 9.8.
  
  We also remove the -Wdeprecated-type-abstractions flag, which was
  introduced in GHC 9.10.
  

• f813c8d7
  by sheaf at 2024-12-03T17:10:15-05:00

  Hadrian: use / when making filepaths absolute
  
  In Hadrian, we are careful to use -/- rather than </>, in order to use
  / instead of \ in filepaths. However, this gets ruined by the use of
  makeAbsolute from System.Directory, which, on Windows, changes back
  forward slashes to backslashes.
  

• 292ed74e
  by Ben Gamari at 2024-12-03T17:10:52-05:00

  rts/linker: Fix out-of-bounds mapping logic
  
  Previously the structure of `mmapInRegion` concealed a subtle bug
  concerning handling of `mmap` returning mappings below the beginning of
  the desired region. Specifically, we would reset `p = result + bytes`
  and then again reset `p = region->start` before looping around for
  another iteration. This resulted in an infinite loop on FreeBSD.
  
  Fixes #25492.
  

• 20912f5b
  by Ben Gamari at 2024-12-03T17:10:52-05:00

  rts/linker: Clarify debug output
  

• f98b3ac0
  by Simon Hengel at 2024-12-03T17:11:30-05:00

  SysTools: Avoid race conditions when processing output (fixes #16450)
  

• 03851b64
  by Rodrigo Mesquita at 2024-12-03T17:12:06-05:00

  mg: Drop unnecessary HasCallStack
  
  This HasCallStack was a debugging artifact from a previous commit.
  

• 01d213b5
  by Rodrigo Mesquita at 2024-12-03T17:12:06-05:00

  Improve haddock of graphReachabilityCyclic
  

• f7cbffe2
  by Rodrigo Mesquita at 2024-12-03T17:12:06-05:00

  Refactor ModuleGraph interface
  
  The 'ModuleGraph' abstraction represents the relationship and strucutre
  of the modules being compiled. This structure is meant to be constructed
  once at the start of compilation, and never changed again.
  
  However, it's exposed interface was confusing and exposed too many
  footguns which led to inneficient usages of the ModuleGraph. This commit
  improves significantly the exported interface of ModuleGraph, taking
  into consideration the recent improvements around reachability queries.
  
  Since the ModuleGraph graphs and related structures (HPT, EPS) are
  performance critical in the sense that somewhat simple mistakes can
  cause bad leaks and non-linear memory usage, we want to have proper APIs
  that guide efficient usage. This is a good step in that direction.
  

• b69a7f3c
  by David Binder at 2024-12-04T18:37:42-05:00

  Use consistent capitalization for "GHC Proposal" in user guide
  

• 18d9500d
  by David Binder at 2024-12-04T18:37:42-05:00

  Fix reference to GHC proposal 193 in user guide
  

• dd959406
  by Ben Gamari at 2024-12-04T18:38:18-05:00

  Revert "rts/Interpreter: Assert that TEST*_P discriminators are valid"
  
  This assertion was based on the misconception that `GET_TAG` was
  returning the pointer tag whereas it is actually returning the
  constructor tag.
  
  This reverts commit 9bf3663b9970851e7b5701d68147450272823197.
  
  Fixes #25527.
  

• cad6fede
  by Ben Gamari at 2024-12-04T18:38:54-05:00

  rts/IOManager: Drop dead code
  
  This assignment is dead code as it occurs after all branches have
  returned. Moreover, it can't possibly be relevant since the "available"
  branch already sets `flag`.
  
  Potentially fixes #25542.
  

• 55d8304e
  by Ben Gamari at 2024-12-06T16:56:00-05:00

  ghc-internal: Drop GHC.Internal.Data.Enum
  
  This module consists only of reexports and consequently there is no
  reason for it to exist.
  

• 56b9f484
  by Ben Gamari at 2024-12-06T16:56:00-05:00

  base: Introduce Data.Bounded
  
  As proposed in [CLC#208] but unfortunately `Data.Enum` was already
  incorrectly introduced in the `ghc-internal` refactor.
  
  [CLC#208]: https://github.com/haskell/core-libraries-committee/issues/208
  

• 336d392e
  by Ben Gamari at 2024-12-06T16:56:00-05:00

  base: Deprecate export of Bounded from Data.Enum
  
  This begins the process of bringing us into compliance with
  [CLC#208].
  
  [CLC#208]: https://github.com/haskell/core-libraries-committee/issues/208
  

• dd7ca939
  by Ben Gamari at 2024-12-06T16:56:00-05:00

  base: Mention incorrect Data.Enum addition in changelog
  

• dfd1db48
  by Ben Gamari at 2024-12-06T16:56:36-05:00

  base: Reintroduce {Show,Enum} IoSubSystem
  
  These instances were dropped in !9676 but not approved by the CLC.
  
  Addresses #25549.
  

• 090fc7c1
  by Peter Trommler at 2024-12-07T03:41:21-05:00

  Fix requirements on T25240
  
  T25240 doesn't need RTS linker, GHCi is sufficient and GHCi can also be
  dynamically linked.
  

• 3fb5d399
  by Peter Trommler at 2024-12-07T03:41:21-05:00

  Fix requirements for T25155
  
  Loading C objects requires RTS linker.
  

• 4c58bdf6
  by Leary at 2024-12-07T03:42:07-05:00

  TH: Add typed variants of dataToExpQ and liftData
  
  This commit introduces to template-haskell (via ghc-internal) two
  functions `dataToCodeQ` and `liftDataTyped`, typed variants of
  `dataToExpQ` and `liftData` respectively.
  
  Tested in: `dataToCodeQUnit`.
  

• 63027593
  by Serge S. Gulin at 2024-12-08T13:52:05+03:00

  JS: Basic cleanup for unused stuff to simplify things.
  
  1. Make `staticInitStat`, `staticDeclStat`, `allocUnboxedConStatic`, `allocateStaticList`, `jsStaticArg` local to modules.
  2. Remove unused `hdRawStr`, `hdStrStr` from Haskell and JavaScript (`h$pstr`, `h$rstr`, `h$str`).
  3. Introduce a special type `StaticAppKind` enumeration and `StaticApp` to represent boxed scalar static applications. Originally, StaticThunk supported to pass Maybe when it became Nothing for initializied thunks in an alternatie way but it is not used anymore.
  

• a9f8f1fb
  by Serge S. Gulin at 2024-12-08T14:10:45+03:00

  JS: Add trivial optimizations for `unpackCString` and `unpackCStringUtf8`.
  
  It became possible due of introduction strings unfloating at Sinker pass (#13185). Earns few more bytes at optimizations.
  

• b519c06b
  by Serge S. Gulin at 2024-12-08T15:50:26+03:00

  JS: Specialize unpackCString# CAFs (fixes #24744)
  
  Code analysis shown that such optimization would be possible out of the box if `cachedIdentForId` allowed to do that for Haskell `Id`s which are represented by few JavaScript `Ident`s. It is a usual for strings which are represented at JavaScript as a pair of 2 values: the string content and the offset where to start reading actual string from the full content. Usually offset is 0 but technically we need to allow such complex structures to be treated as "global".
  
  Enabling it there shown that `genToplevelRhs` and `globalOccs` had inaccuracies in their implementations:
  1. `globalOccs` operated over JavaScript's `Ident`s but for complex structures it didn't pay attention to the fact that different Idents actually could be pointed to same Id. Now the algo is changed to calculate occurencies for Ids.
  2. `genToplevelRhs` didn't assume that different Idents pointed to same Id can have mixed order of occurence. But actually the order is important. Strings are encoded into 2 variables where first is content and second is offset and their order are not interchangeable. It is fixed by regeneration Idents from collected Ids which is fine because all Idents generation is passed through the Cache and they are quasi-stable.
  

• a8ceccf3
  by Brandon Chinn at 2024-12-09T16:25:43-05:00

  Fix panic in multiline string with unterminated gap (#25530)
  

• 9e464ad0
  by Brandon Chinn at 2024-12-09T16:25:43-05:00

  Add test case for unterminated multiline string
  

• ed1ed5c6
  by Rodrigo Mesquita at 2024-12-09T16:26:19-05:00

  Revert mapMG renaming
  
  We had previously renamed this function for consistency, but that caused unnecessary breakage
  

• 158261f7
  by Sylvain Henry at 2024-12-09T16:27:01-05:00

  RTS: make Cabal flags manual
  
  Cabal shouldn't automatically try to set them. We set them explicitly.
  

• a83b7ed6
  by Matthew Stephenson at 2024-12-10T14:01:22-05:00

  Add missing @since documentation for (!?) function

• e745e3a3
  by Ben Gamari at 2024-12-10T14:01:59-05:00

  compiler: Don't attempt to TSAN-instrument SIMD operations
  
  TSAN only provides instrumentation for 8, 16, 32, and 64-bit memory
  loads/stores. Don't attempt to instrument wider operations.
  
  Fixes #25563.
  

• 684c0018
  by Ben Gamari at 2024-12-10T14:02:35-05:00

  gitlab/ci: Don't clobber RUNTEST_ARGS
  
  Previously the logic handling `IGNORE_PERF_FAILURES` clobbered the
  user's `RUNTEST_ARGS`. Fix this.
  

• 41dae5b8
  by Ben Gamari at 2024-12-10T14:03:11-05:00

  hadrian: Mitigate mktexfmt race
  
  At least some versions of Texlive's `mktexfmt` utility cannot be invoked
  concurrently in their initial run since they fail to handle failure of
  `mkdir` due to racing. Specifically, we see
  
  ```
  | Run Xelatex: users_guide.tex => /tmp/extra-dir-9616886274866
  | Run Xelatex: Haddock.tex => /tmp/extra-dir-9616886274869
  This is XeTeX, Version 3.14159265-2.6-0.999992 (TeX Live 2020) (preloaded format=xelatex)
   restricted \write18 enabled.
  kpathsea: Running mktexfmt xelatex.fmt
  mktexfmt: mktexfmt is using the following fmtutil.cnf files (in precedence order):
  mktexfmt:   /usr/share/texlive/texmf-dist/web2c/fmtutil.cnf
  mktexfmt: mktexfmt is using the following fmtutil.cnf file for writing changes:
  mktexfmt:   /builds/ghc/ghc/tmp-home/.texlive2020/texmf-config/web2c/fmtutil.cnf
  /usr/bin/mktexfmt: mkdir(/builds/ghc/ghc/tmp-home/.texlive2020/texmf-var/web2c/) failed for tree /builds/ghc/ghc/tmp-home/.texlive2020/texmf-var/web2c: File exists at /usr/share/texlive/tlpkg/TeXLive/TLUtils.pm line 937.
  I can't find the format file `xelatex.fmt'!
  ```
  
  That is two `mktexfmt` invocations (for the user's guide and haddock
  builds) attempted to create `$HOME/texlive2020/texmf-var/web2c` and
  raced. One of the two `mkdir`'s consequently failed, bringing down the
  entire build.
  
  We avoid this by ensuring that the first `xelatex` invocation is always
  performed serially.
  
  Fixes #25564.
  

• 9efbc51f
  by Ben Gamari at 2024-12-10T14:03:48-05:00

  rts/CheckUnload: Reset old_objects if unload is skipped
  
  Previously `checkUnload` failed to reset `old_objects` when it decided
  not to unload (e.g. due to heap profiling being enabled).
  
  Fixes #24935.
  

• 5192a75f
  by Ben Gamari at 2024-12-11T04:28:11-05:00

  rts: Annotate BCOs with their Name
  
  This introduces a new bytecode instruction, `BCO_NAME`, to aid in debugging
  bytecode execution. This instruction is injected by `mkProtoBCO` and
  captures the Haskell name of the BCO. It is then printed by the
  disassembler, allowing ready correlation with STG dumps.
  

• 99225996
  by Ben Gamari at 2024-12-11T04:28:48-05:00

  configure: Implement ld override whitelist
  
  Bring `configure` into alignment with `ghc-toolchain`, ensuring that the
  ld-override logic will only take effect on Linux and Windows.
  
  Fixes #25501.
  

• 4a8fc928
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  testsuite: Unmark T14028 as broken on FreeBSD
  
  This now appears to pass on FreeBSD 14.
  
  Closes #19723.
  

• d7c0eb5a
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  gitlab-ci: Migrate FreeBSD runner tag to FreeBSD 14
  

• 7246dacc
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  gitlab-ci: Reintroduce FreeBSD 14 job
  

• 4af936da
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  gitlab-ci: Allow use of newer cabal-install bindists
  
  Newer cabal-install bindists have internal directory structure.
  Here we detect and account for the presence of such structure.
  

• cbf38c1b
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  gitlab-ci: Enable documentation build on FreeBSD 14
  

• d68107fb
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  gitlab-ci: Use system libffi on FreeBSD
  

• fea3b590
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  testsuite: Mark linker_unload as broken on FreeeBSD
  
  Due to #25491.
  

• ccf171ee
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  gitlab-ci: Prefer system toolchain on FreeBSD
  
  It's not uncommon to find machines with gcc installed via ports. We
  should be using the system's default clang-based toolchain instead.
  

• cfb34738
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  testsuite: Mark T21969 as broken on FreeBSD
  
  Due to #25512.
  

• 0b64e37c
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  testsuite: Mark RestartEventLogging as broken on FreeBSD
  
  I am seeing this fail quite reproducibly.
  
  Due to #19724.
  

• 3b412019
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  testsuite: Mark T16180 as "broken" on FreeBSD
  
  Sadly we in fact need to skip it as it merely times out during
  compilation.
  
  See #14012.
  

• 57e3cab5
  by Ben Gamari at 2024-12-11T12:33:42+00:00

  testsuite: Skip T16992 unless in slow speed
  
  This test has extraordinary memory requirements and tests a rather
  niche aspect of the compact region mechanism. It has been suggested
  multiple times that we shouldn't run it in the default testsuite
  configuration. Finally implement this.
  
  See #21890.
  See #21892.
  

• f08a72eb
  by Ben Gamari at 2024-12-11T19:30:54-05:00

  rts(setNumCapabilities): Assert that n_caps < MAX_N_CAPS
  
  It was noticed in #25560 that this would previously be allowed,
  resulting in a segfault.
  
  I will add a proper exception in `base` in a future commit.
  

• e10d31ad
  by Ben Gamari at 2024-12-11T19:30:55-05:00

  ghc-internal: Fix inconsistent FFI import types
  
  The foreign imports of `enabled_capabilities` and
  `getNumberOfProcessors` were declared as `CInt` whereas they are defined
  as `uint32_t`.
  

• 06265655
  by Ben Gamari at 2024-12-11T19:30:55-05:00

  rts: Mention maximum capability count in users guide
  
  Addresses #25560.
  

• d488470b
  by Ben Gamari at 2024-12-11T19:30:55-05:00

  rts/Capability: Move induction variable declaration into `for`s
  
  Just a stylistic change.
  

• 71f050b7
  by Ben Gamari at 2024-12-11T19:30:55-05:00

  rts: Determine max_n_capabilities at RTS startup
  
  Previously the maximum number of capabilities supported by the RTS was
  statically capped at 256. However, this bound is uncomfortably low given
  the size of today's machine.
  
  While supporting unbounded, fully-dynamic adjustment would be nice, it
  is complex and so instead we do something simpler: Probe the logical
  core count at RTS startup and use this as the static bound for the rest
  of our execution.
  
  This should avoid users running into the capability limit on large
  machines while avoiding wasting memory on a large capabilities array for
  most users and keeping complexity at bay.
  
  Addresses #25560.
  

• 1e84b411
  by Ben Gamari at 2024-12-11T19:30:55-05:00

  testsuite: Introduce req_c_rts
  
  As suggested by @hsyl20, this is intended to mark tests that rely on the
  behavior of the C RTS.
  

• 683115a4
  by Ben Gamari at 2024-12-11T19:30:55-05:00

  testsuite: Add test for #25560
  

• ef2052a8
  by Ben Gamari at 2024-12-12T04:42:32-05:00

  testsuite: Only run T14497_compact in normal way
  
  This test targets the compacting GC so it makes little sense to run it
  across all ways. Moreover, it outright conflicts with the `nonmoving`
  way.
  

• 34d3e8e6
  by Ben Gamari at 2024-12-12T04:43:08-05:00

  rts/CheckUnload: Don't prepare to unload if we can't unload
  
  Previously `prepareUnloadCheck` would move the `objects` list to
  `old_objects` even when profiling (where we cannot unload). This caused
  us to vacate the `objects` list during major GCs, losing track of loaded
  objects. Fix this by ensuring that `prepareUnloadCheck` and
  `checkUnload` both use the same short-cutting logic.
  

• 9c53489d
  by Andrei Borzenkov at 2024-12-12T15:06:42-05:00

  Update GHCi :info type declaration printing (#24459)
  
  - Do not print result's kind in type families
    because we have full kind in SAKS and we display
    invisible arity using @-binders
  
  - Do not suppress significant invisible binders
  
  An invisible binder is considered significant when it meets at least
  one of the following two criteria:
    - It visibly occurs in the declaration's body
    - It is followed by a significant binder,
      so it affects positioning
  For non-generative type declarations (type synonyms and type families)
  there is one additional criterion:
    - It is not followed by a visible binder, so it
      affects the arity of a type synonym
  
  See Note [Print invisible binders in interface declarations]
  for more information about what is "visibly occurs"
  

• 13fe48d4
  by Matthew Pickering at 2024-12-12T15:07:19-05:00

  typechecker: Perform type family consistency checks in topological order
  
  Consider a module M importing modules A, B and C.
  
  We can waste a lot of work depending on the order that the modules are
  checked for family consistency.
  
  Consider that C imports A and B. When compiling C we must have already
  checked A and B for consistency, therefore if C is processed first then
  A and B will not need to be checked for consistency again.
  
  If A and B are compared first, then the consistency checks will be
  performed against (wasted as we already performed them for C).
  
  At the moment the order which modules are checked is non-deterministic.
  
  Clearly we should engineer that C is checked before B and A, but by what
  scheme?
  
  A simple one is to observe that if a module M is in the transitive
  closure of X then the size of the consistent family set of M is less
  than or equal to size of the consistent family set of X.
  
  Therefore by sorting the imports by the size of the consistent family
  set and processing the largest first, you make sure to process modules
  in topological order.
  
  In practice we have observed that this strategy has reduced the amount
  of consistency checks performed.
  
  One solution to #25554
  

• 62a2b25f
  by Sylvain Henry at 2024-12-14T04:31:09-05:00

  TNTC: set CmmProc entry_label properly (#25565)
  
  Before this patch we were renaming the entry label of a CmmProc late in
  the CmmToAsm pass. It led to inconsistencies and to some labels being
  used in info tables but not being emitted (#25565).
  Now we set the CmmProc entry label earlier in the StgToCmm monad and we
  don't renamed it afterwards.
  

• b339e7c3
  by Simon Hengel at 2024-12-14T04:31:47-05:00

  Make filter functionality for system tools line-based
  
  This is more efficient as:
  
  - All existing filter functions were line-based anyway.  They broke up
    the input into lines and then joined it back together.
  - We already break up the output from system tools into lines when
    processing it.
  
  Splitting up the output of system tools once and then filtering and
  processing it reduces both code and runtime complexity.
  

• 39669077
  by Simon Hengel at 2024-12-14T04:31:47-05:00

  Refactoring: Don't use a `Chan` when parsing SysTools output
  

• 64756530
  by Simon Peyton Jones at 2024-12-14T22:28:04-05:00

  Tidy up the handling of `assert`
  
  Fixes #25493
  

• 8658fbc1
  by Rodrigo Mesquita at 2024-12-14T22:28:41-05:00

  base: displayException for SomeAsyncException
  
  Provide a better implementation of `SomeException` for
  `SomeAsyncException`.
  The previous, implicit, implementation, would not use the
  `displayException` of the exception wrapped by `SomeAsyncException`.
  
  Implements CLC-Proposal#309
  
  Closes #25513
  

• 2d3a0a70
  by ARATA Mizuki at 2024-12-15T18:35:30-05:00

  LLVM: When emitting a vector literal with ppTypeLit, include the type information
  
  Fixes #25561
  

• bfacc086
  by Simon Peyton Jones at 2024-12-15T18:36:05-05:00

  Fix signature lookup in instance declarations
  
  This fixes a bug introduced by the fix to #16610
  

• 80f0e02d
  by Simon Peyton Jones at 2024-12-16T17:13:52+00:00

  Improve GHC build times
  
  Two small changes
  
  * In GHC.Data.Unboxed, never omit interface pragmas.  In "fast builds"
    one might omit them generally, but doing so gives very bad
    performance for code that imports this module.
  
  * In GHC.Hs.Dump don't do type-class specialisation.  For some reason
    it goes mad and generates vast amounts of useless code.  See #25463.
  

• 175a1355
  by Simon Peyton Jones at 2024-12-16T17:13:52+00:00

  Refactor Lint
  
  Refactor Lint for two reasons:
  
  * To improve performance
  * To prepare for type-lets
  
  The big changes are all in GHC.Core.Lint:
  
  * Change the main APIs:
    * `lintType` returns nothing rather than returning a `LintedType`;
    * `lintCoercion` return nothing rather than returning a `LintedCoercion`
    Reason: these functions did a lot of allocation to return a substituted
    type/coercion that was often discarded, or used only to extract its kind.
  
    Instead we now return nothing, and, when needed, extract the kind and
    substitute.
  
  * Applications are treated as a whole, by `lintApp`.  By treating
    multiple arguments all at once we avoid performing multiple
    substitutions, each substituting a single type variable. This can
    make an absolutely huge difference.
  
  Overall this led to a pretty massive rewrite of Lint, with many smaller
  changes.
  
  Smaller chnages elsewhere
  
  * Rename `GHC.Core.TyCo.Subst.getSubstInScope` to `substInScopeSet` for consistency
  
  * Define and use `GHC.Core.Type.liftedTypeOrConstraintKind`
  
  Performance. This MR someimtes gives gives a very large improvement in
  compile time, when Lint is on.  here is a selection of changes over 5%
  in perf/compiler (with -dcore-lint)
  
        T25196                       -97.0%
        T14766                       -89.7%
        T14683                       -74.4%
        T5631                        -60.9%
        T20261                       -56.7%
        T18923                       -17.6%
        T13035                       -15.8%
        T6048                        -15.8%
        CoOpt_Read                   -14.4%
        T9630                        -10.9%
        T5642                         -7.3%
  
  Eliminating the egregious offenders is a big win.
  
  However, in some cases the compiler allocation /increases/. Here ae the
  changes over 1%:
  
        T9961                          1.5%
        T8095                          2.8%
        T14052                         3.9%
        T12545                         4.5%
        T14052Type                     5.5%
        T5030                          8.0%
        T5321Fun                       8.3%
        T3064                         12.7%
        CoOpt_Singletons              15.6%
        T9198                         16.0%
        LargeRecord                   18.1%
  
  I looked at the two biggest increases in compile-time bytes allocated.  Interestingly,
  they both show substantial *decreases* in actual compile time, due to much smaller GC times.
  I'm honestly not sure either why the allocation increases, or why the GC time decreases;
  but I'm going to take the win!
  
      T9198
                   Baseline            With patch
      No Lint
        Alloc       44.6M              44.6M
        Mut time    0.23s              0.22s
        GC time     0.21s              0.21s
  
      With Lint
        Alloc       309M               360M
        Mut time    1.51s              0.85s
        GC time     2.97s              0.25s
  
      -------------------
      LargeRecord
                   Baseline            With patch
      No Lint
        Alloc       1.37G              1.37G
        Mut time    2.33s              2.33s
        GC time     2.40s              2.42s
  
      With Lint
        Alloc       3.4G               4.0G
        Mut time    6.02s              5.68s
        GC time     3.67s              3.03s
  
  IMPORTANT NOTE: These changes don't show up in CI because in CI the
  tests in perf/compiler are all run with -dcore-lint switched off.  I
  gathered this data with some manual runs.
  

• 8ef2dad6
  by Simon Peyton Jones at 2024-12-17T02:48:09-05:00

  Add Note [Typechecking overloaded literals]
  
  See #25494.
  

• e86b1b20
  by Ben Gamari at 2024-12-17T13:51:39-05:00

  testsuite: Use math.inf instead of division-by-zero
  
  This both more directly captures the intent and also fixes #25580.
  

• 430d965a
  by Ben Gamari at 2024-12-17T13:52:15-05:00

  rts: Fix incorrect format specifiers in era profiling
  
  Fixes #25581.
  

• 267098ad
  by Andreas Klebinger at 2024-12-18T23:43:13-05:00

  Document `-prof` and non `-prof` code being incompatible.
  
  Fixes #25518.
  

• 04433916
  by Zubin Duggal at 2024-12-18T23:43:50-05:00

  ghcup metadata: output metadata fragment in CI
  
  (cherry picked from commit 52b58a660e735b20961d792d8fa9267f01247a50)
  

• 7c78804e
  by Zubin Duggal at 2024-12-18T23:43:50-05:00

  ghcup metatdata: use fedora33 for redhat
  
  Redhat 9 doesn't have libtinfo.so.5 anymore
  
  (cherry picked from commit dc86785eb43afd1bd292287c064fb5ad94fe8c7f)
  

• 1d72cfb2
  by Zubin Duggal at 2024-12-18T23:43:50-05:00

  ghcup metadata: still use centos for redhat <9
  

• 3f7ebc58
  by Sylvain Henry at 2024-12-19T20:40:14-05:00

  Merge ghc-bignum into ghc-internal (#24453)
  
  First step towards merging ghc-bignum and ghc-prim into ghc-internal.
  
  After this patch, ghc-bignum is deprecated and is just a shallow package
  reexporting modules from ghc-internal and base. Use those directly
  instead.
  
  Move `gmp` submodule into ghc-internal directory.
  

• ee0150c2
  by Rodrigo Mesquita at 2024-12-19T20:40:51-05:00

  Improve performance of deriving Show
  
  Significantly improves performance of deriving Show instances by
  avoiding using the very polymorphic `.` operator in favour of inlining
  its definition. We were generating tons of applications of it, each
  which had 3 type arguments!
  
  Improves on #9557
  
  -------------------------
  Metric Decrease:
      InstanceMatching
      T12707
      T3294
  ------------------------
  

• 8b266671
  by Rodrigo Mesquita at 2024-12-19T20:40:51-05:00

  Don't eta expand cons when deriving Data
  
  This eta expansion was introduced with the initial commit for Linear
  types.
  
  I believe this isn't needed any longer. My guess is it is an artifact
  from the initial linear types implementation: data constructors are
  linear, but they shouldn't need to be eta expanded to be used as higher
  order functions. I suppose in the early days this wasn't true.
  
  For instance, this works now:
  
      data T x = T x
      f = \(x :: forall y. y -> T y) -> x True
      f T -- ok!
  
  T is linear, but can be passed where an unrestricted higher order
  function is expected. I recall there being some magic around to make
  this work for data constructors...
  
  Since this works, there's no need to eta_expand the data constructors in
  the derived Data instances.
  

• 1f67ad21
  by Andrei Borzenkov at 2024-12-25T01:42:31-05:00

  Flip the order of arguments of setField (#24668)
  
  GHC Proposal 583 "HasField redesign" specifies the
  following order of a setField function arguments as this:
  
    setField :: forall fld a b. SetField fld a b. b -> a -> a
  
  This patch flips the application order to match the spec.
  

• 3e0c948d
  by Ben Gamari at 2024-12-25T01:43:08-05:00

  rel-eng/upload: Add set_symlink mode
  
  This slightly eases updating of the `latest` symlinks.
  

• 63d63f9d
  by Simon Peyton Jones at 2024-12-25T01:43:45-05:00

  Preserve orientation when unifying kinds
  
  This MR fixes yet another manifestation of the trickiness caused
  by Note [Fundeps with instances, and equality orientation].
  
  I wish there was a more robust way to do this, but this fix is
  a definite improvement.
  
  Fixes #25597
  

• 94ba9a6a
  by ARATA Mizuki at 2024-12-26T10:47:57-05:00

  x86 NCG SIMD: Support pack/insert/broadcast/unpack of 128-bit integer vectors
  

• 6bf0d587
  by Andrew Lelechenko at 2024-12-26T10:48:33-05:00

  docs: fix haddock formatting in Control.Monad.Fix
  

• feb14af1
  by Sergey Vinokurov at 2024-12-27T15:06:28+00:00

  Remove unnecessary irrefutable patterns from NonEmpty functions
  
  Implementation of https://github.com/haskell/core-libraries-committee/issues/107
  

• 6a0d91b4
  by Sergey Vinokurov at 2024-12-27T15:06:28+00:00

  Make cons, Semigroup, IsList, and Monad instances stricter
  

• 1249e597
  by Sergey Vinokurov at 2024-12-27T15:06:28+00:00

  Restore some laziness in <| and Semigroup instance, improve Monad instance
  
  The Monad instance shouldn't produce the outer :| unless f a reduces
  to WHNF. (Notice that the b :| bs match is implicitly lazy.)
  

• 8699d826
  by Sergey Vinokurov at 2024-12-27T15:12:30+00:00

  Add comment outlining Data.List.NonEmpty implementation guiding principles
  

• 7febe00e
  by Sergey Vinokurov at 2024-12-27T22:24:43+00:00

  Fix tests since location of ‘>>=’ changed
  

• a928c326
  by ARATA Mizuki at 2024-12-28T03:06:14-05:00

  Fix LLVM version detection
  
  With a recent LLVM, `llc -version` emits the version on the first line
  if the vendor is set.  It emits the version on the second line
  otherwise.
  
  Therefore, we need to check the both lines to detect the version.
  
  GHC now emits a warning if it fails to detect the LLVM version,
  so we can notice if the output of `llc -version` changes in the future.
  
  Also, the warning for using LLVM < 10 on s390x is removed, because
  we assume LLVM >= 13 now.
  
  This fixes the definition of __GLASGOW_HASKELL_LLVM__ macro.
  
  Fixes #25606
  

• 7f79257a
  by Zubin Duggal at 2024-12-29T13:04:35+00:00

  Bump base, ghc-prim and template-haskell versions for 9.12
  
  Also bump various submodules.
  
  (cherry picked from commit 6fc1fa3bdc8f53acdb19e47145789274060e498f)
  
  Bump base bound to 4.21 for GHC 9.12
  
  (cherry picked from commit 473a201c6b55aea5bf9c9db0836a66ea1b657e04)
  
  Bump binary submodule to 0.8.9.2
  
  (cherry picked from commit 7199869a52ab45e8856658248bf807954d58cc20)
  (cherry picked from commit ec2f40b45c1a3d82d17a2fc07e9ddb9218bc3940)
  
  Bump exceptions submodule to 0.10.9
  
  (cherry picked from commit f5b5d1dc2d326368e5b173d622630d77f019b629)
  
  Bump file-io submodule to 0.1.4
  
  (cherry picked from commit ba786681de6ac5fa49938e2cd71a5988f0f40d1f)
  
  bump os-string submodule to 2.0.6
  
  (cherry picked from commit 3a7ffdbb832c045a55fd1ef24f546abdd9d9e30f)
  
  bump transformers submodule to 0.6.1.2
  
  (cherry picked from commit 53b46fd437421b9e5a001edc6d1c427439d7714f)
  
  Bump directory submodule to v1.3.9.0
  
  (cherry picked from commit 27dc2664c5404bb462092bb216c2c37b418fd1f8)
  
  Bump Win32 submodule to v2.14.1.0
  
  (cherry picked from commit 80df88086180f5e39212b2feacf70a9d2b263c6c)
  
  Bump filepath submodule to 1.5.3.0
  
  (cherry picked from commit 29bfae2c58a7303a081a6e7956b9f55e5faf3eeb)
  
  Bump file-io submodule to avoid usage of QuasiQuotes
  
  (cherry picked from commit 97b0dff223a6c4cc003adec448104c277f214645)
  
  Bump unix submodule to 2.8.6.0
  
  (cherry picked from commit a1f56d6d6a99c100f88ef0a8b4d51298cf24a42d)
  
  Bump os-string submodule to 2.0.8
  
  (cherry picked from commit 0121b76fd52ea0c0ce5d07085bc195666b63c625)
  
  Bump file-io submodule to avoid usage of QuasiQuotes
  
  (cherry picked from commit 962ceb50c8a6fc370e1c0a267f5cd5562a8cf759)
  
  Bump filepath submodule to 1.5.4.0
  
  (cherry picked from commit 7bc6877fd5d41c6d5900678ad5e73ed30f366569)
  
  Bump file-io submodule to 0.1.5
  
  (cherry picked from commit 9478b5aefe2877d58baf527edcf936dddbb955b7)
  
  Bump Cabal submodule to 3.14.1.0
  
  (cherry picked from commit 5c9c3e3f79a79bb6d9a77a17c716dc3a0bcbd2aa)
  
  Bump directory submodule to 0.12.2.0
  
  (cherry picked from commit 897906265db37af34ae2aaa016cec417f263407b)
  
  Bump array submodule for base bump
  
  Bump stm submodule for base bump
  
  Bump process submodule for base bump
  

• f6079408
  by Zubin Duggal at 2024-12-29T13:04:35+00:00

  Fix ghc-e005 after HasCallstack changes
  
  (cherry picked from commit 77f340a24561cea8a6f2ada296b3ea356ab1823c)
  

• 3e10fa75
  by Zubin Duggal at 2024-12-29T13:04:35+00:00

  Add haskeline to stage0Packages
  
  Otherwise we link against boot inplace and boot unix as boot haskeline
  depends on boot unix.
  
  (cherry picked from commit 90b493769ebdf3cd7be404d18462dc20ac1044df)
  

• 4ad6aec4
  by Zubin Duggal at 2024-12-29T13:04:35+00:00

  Fix TH changelog
  

• ea3f7fd5
  by Zubin Duggal at 2024-12-29T13:04:35+00:00

  release: copy index.html from correct directory
  
  (cherry picked from commit cbfd0829cd61928976c9eb17ba4af18272466063)
  

• fafb70db
  by Zubin Duggal at 2024-12-29T13:04:35+00:00

  hadrian-multi: warn on unused imports
  
  os-string has redundant imports
  
  (cherry picked from commit dde3796be689ea57543936e22aa5ea4ef7ed995e)
  

• c02b1e46
  by Simon Peyton Jones at 2024-12-29T17:04:30-05:00

  Fix in-scope set for CSE
  
  Ticket #25468 showed an assertion failure in CSE because a top-level
  Id was being used before it was defined.  Reason: Note [Glomming] in
  GHC.Core.Opt.OccurAnal.
  
  Solution (used in many places): just put all the top-level bindings in
  scope at the beginning of CSE.
  
  Compile-time allocation wobbles up and down a tiny bit; geo mean is
  zero. But MultiLayerModulesTH_OneShot and hard_hole_fits increase (on
  some architectures only) by a bit oever 2% .  I think these are just a
  random fluctuations.
  
  Metric Increase:
      MultiLayerModulesTH_OneShot
      hard_hole_fits
  

• 559d4f84
  by Krzysztof Gogolewski at 2024-12-30T11:53:19-05:00

  Add tests for #23883
  
  The issue has been fixed by commit f5d3e03c56ffc63.
  Only T23883a is the actual regression test, the remaining ones are
  tricky cases found during development of an independent fix !11313.
  

• 278a53ee
  by Sergey Vinokurov at 2024-12-30T11:53:59-05:00

  Update changelog for CLC proposal #107 (NonEmpty laziness)
  

• f56558be
  by Matthew Pickering at 2025-01-07T13:53:03-05:00

  warnings: Find out if a qualified name is in the interactive scope directly
  
  There were two ad-hoc mechanisms used to determine which modules were in
  the interactive scope.
  
  1. Look at everything in the GRE, to see what is imported qualified.
  2. Look at the last loaded module in the HPT.
  
  (1) Is very inefficient, GlobalRdrEnvs can be very big.
  (2) is incorrect, there is no reason to assume the "last" thing added to
  the HPT has any relevance to module loading order.
  
  Happily, the same checks can be implemented directly by looking at the
  interactive imports from the interactive context. This mirrors what
  happens for normal imports.
  
  Arguably, the error reporting code shouldn't be doing this kind of
  processing and it should be an option is set when rendering the error
  message. However, this just improves the situation and doesn't block
  progress on that front in future.
  
  See #14225 and #15611
  
  Fixes #25600
  

• 84155cdb
  by Simon Peyton Jones at 2025-01-07T13:53:40-05:00

  Tidy up kcConDecls
  
  Addresses #25630
  
  In particular,
  
  * Introduce ConArgKind and use it.
  
  * Make kcConDecls and tcConDecls work the same way
    concerning the kind of argument types
  

• 6c12b6cf
  by Bryan Richter at 2025-01-07T18:15:02-05:00

  Remove tmp files after toolchain check
  
  Fixes #25620
  

• 42826a89
  by Cheng Shao at 2025-01-07T18:15:39-05:00

  xxhash: bump to v0.8.3
  

• 185f17e4
  by sheaf at 2025-01-07T18:16:15-05:00

  Fix typo in GHC.Tc.Solver.Solve.runTcPluginsWanted

• 23099752
  by Luite Stegeman at 2025-01-08T00:33:33+01:00

  Add flags for switching off speculative evaluation.
  
  We found that speculative evaluation can increase the amount of
  allocations in some circumstances. This patch adds new flags for
  selectively disabling speculative evaluation, allowing us to
  test the effect of the optimization.
  
  The new flags are:
  
    -fspec-eval
       globally enable speculative evaluation
  
    -fspec-eval-dictfun
       enable speculative evaluation for dictionary functions (no effect
       if speculative evaluation is globally disabled)
  
  The new flags are on by default for all optimisation levels.
  
  See #25284
  

• 0161badc
  by Ben Gamari at 2025-01-09T17:30:05-05:00

  rts/printClosure: Print IPE information for thunks and functions
  
  This makes it considerably easier to grok the structure of the heap
  when IPE information is available.
  

• 023f36f5
  by Rodrigo Mesquita at 2025-01-10T14:57:48-05:00

  user_guide: Note -pgmP/-optP are for /Haskell/-CPP
  
  Fixes #25574
  

• e1c133f2
  by Ben Gamari at 2025-01-10T14:58:25-05:00

  dump-decls: Suppress unit-ids
  
  While the testsuite driver already normalizes these away, they are
  nevertheless a severe nuisance when diffing outside of the testsuite.
  
  Intriguingly, this doesn't completely eliminate the unit IDs; some
  wired-in names are still printed. However, this is a cheap and helpful
  improvement over the status quo so I am simply going to accept this.
  
  Fixes #25334.
  

• 2e7bf446
  by sheaf at 2025-01-13T10:55:26+01:00

  Remove SDocs from ErrCtxt & ErrInfo
  
  This commit:
  
    - turns the SDoc used in ErrCtxt into a proper error datatype,
      ErrCtxtMsg, which contains all the different error contexts that
      can be added,
  
    - replaces ErrInfo with [ErrCtxt].
      ErrInfo used to contain two SDocs; the first is replaced with [ErrCtxt],
      and the second is removed, with the relevant information being put
      in the appropriate error message constructors.
  
  Fixes #23436
  

• 2d62b970
  by Mike Pilgrem at 2025-01-13T12:59:10-05:00

  Re CLC #300 - Specify fmap for NonEmpty as map
  
  See:
  * https://github.com/haskell/core-libraries-committee/issues/300
  
  Seeks to:
  * move existing instances for NonEmpty (except of Eq and Ord) out of GHC.Internal.Base into new GHC.Internal.Data.NonEmpty (to avoid otherwise unavoidable cycles in the module graph);
  * move map out of Data.List.NonEmpty (base package) into GHC.Internal.Data.NonEmpty;
  * define fmap as map for NonEmpty instance of Functor, avoiding code duplication;
  * re-export map from existing GHC.Internal.Data.List.NonEmpty; and
  * re-export map from Data.List.NonEmpty (base package);
  
  without breaking anything in the GHC repository.
  
  Various tests *.stdout and *.stderr files are amended also.
  

• ab3ab3e3
  by Luite Stegeman at 2025-01-13T12:59:58-05:00

  compiler/coreprep: Turn off dictionary speculation by default
  
  Speculative evaluation can cause performance regressions,
  therefore we turn it off by default. It can be enabled again
  with the -fspec-eval-dictfun flag
  
  See #25284
  

• 3d9cacd5
  by Patrick at 2025-01-14T02:34:46+08:00

  Enhance kind inference for data family instances
  This commit improves kind inference for data family instances by kind-checking
  the constructors, for H98 and newtype declarations (ONLY), as well as
  kind-checking the result kind signature (when using GADT syntax).
  This fixes #25611.
  
  Typechecker changes:
  In `tcDataFamInstHeader`, we now kind-check the constructors using
  `kcConDecls`, for H98-style decls and newtype decls ONLY.
  See Note [Kind inference for data family instances].
  
  Testsuite changes:
    - The T25611{a,b,c,d} tests test the new kind inference implementation.
      - a,b: infer result kind from constructors (H98 case)
      - c: renamed version of test UnliftedNewtypesUnassociatedFamilyFail,
        which now passes
      - d: GADT case, checking that we don't infer overly rigid kinds when
           kind-checking the constructors in data family instances.
   - DataInstanceKindsDefaults tests defaulting data instance kinds
     without UnliftedNewtypes or UnliftedDatatypes, as outlined in
     Note [Defaulting result kind of newtype/data family instance].
  
  Also a few notes are updated to reflect the changes.
  
  Co-authored-by: default avatarSimon Peyton Jones <simon.peytonjones@gmail.com>
  

• f6493dbc
  by amesgen at 2025-01-15T18:47:23-05:00

  wasm: prevent bundlers from resolving import("node:timers")
  
  This fixes the following esbuild error:
  
      ✘ [ERROR] Could not resolve "node:timers"
  
          www/ghc_wasm_jsffi.js:66:25:
            66 │     return (await import("node:timers")).setImmediate;
               ╵                          ~~~~~~~~~~~~~
  
        The package "node:timers" wasn't found on the file system but is built into node. Are you trying
        to bundle for node? You can use "--platform=node" to do that, which will remove this error.
  
  Previously (i.e. after !13503), one had to work around this by passing
  `--external:node:timers`.
  

• 87e82e2e
  by sheaf at 2025-01-16T14:51:45+01:00

  Use checkTyEqRhs to make types concrete
  
  This commit refactors makeTypeConcrete to call checkTyEqRhs with
  the appropriate parameters. This avoids duplicating subtle logic
  in two places in the compiler.
  
  Changes:
  
    1. Refactor of 'TyEqFlags'. Now 'TyEqFlags' stores a 'TEFTask', which
       is a description of which of the following checks we want to
       perform in 'checkTyEqRhs':
          - occurs check
          - level check
          - concreteness check
  
       In the process, the 'AreUnifying' datatype has been removed, as it
       is no longer needed.
  
    2. Refactor of 'checkTyVar':
        a. Make use of the new 'TEFTask' data type to decide which checks
           to perform.
           In particular, this ensures that we perform **both** a
           concreteness check and a level check when both are required;
           previously we only did a concreteness check (that was a bug!).
        b. Recursively call 'checkTyVar' on the kind of unfilled
           metavariables. This deals with a bug in which we failed to
           uphold the invariant that the kind of a concrete type must
           itself be concrete. See test cases T23051, T23176.
  
    3. Re-write of 'makeTypeConcrete', which now simply calls
       'checkTyEqRhs' with appropriate 'TyEqFlags'/'TEFTask'.
       This gets rid of code duplication and risk for the two code paths
       going out-of-sync.
  
  Fixes #25616. See also #23883.
  

• 5a8f35bd
  by ARATA Mizuki at 2025-01-17T11:17:49-05:00

  x86 NCG: Use correct format for MOVD in the implementation of unpackInt64X2#
  
  MOVD takes the input format.
  
  Fixes #25658
  

• 14f8a7ec
  by Mateusz Goślinowski at 2025-01-17T22:49:09+00:00

  Allow multiline strings in JS FFI (#25633)
  

• 854c2f75
  by Simon Peyton Jones at 2025-01-18T02:54:08-05:00

  Fix a buglet in tcSplitForAllTyVarsReqTVBindersN
  
  The problem was that an equation in `split` had two guards (one about
  visiblity and one about `n_req`). So it fell thorugh if /either/
  was False.  But the next equation then assumed an invisible binder.
  
  Simple bug, easily fixed.  Fixes #25661.
  

• 264a1186
  by sheaf at 2025-01-18T10:05:56+00:00

  Generalise GHC diagnostic code infrastructure
  
  This commit generalises the infrastructure used for diagnostic codes,
  allowing it to be used for other namespaces than the GHC namespace.
  In particular, this enables GHCi to re-use the same infrastructure to
  emit error messages.
  

• bf4f5ad3
  by Jade at 2025-01-18T10:05:56+00:00

  Add structured errors to GHCi (#23338)
  
  This patch creates the 'GhciCommandErrorMessage' data type which
  implents the 'Diagnostic' class and also provides error code for these
  error conditions.
  

• b6f54188
  by Ben Gamari at 2025-01-18T12:38:46-05:00

  Revert "Division by constants optimization"
  
  This appears to be responsible for the regression described in #25653.
  
  This reverts commit daff1e30219d136977c71f42e82ccc58c9013cfb.
  

• 0fd90de8
  by Ben Gamari at 2025-01-18T12:38:46-05:00

  testsuite: Introduce div2 test
  
  This is a useful test from !8392 which is worth keeping around.
  

• 32680979
  by Ben Gamari at 2025-01-18T12:38:46-05:00

  testsuite: Test shift correctness in mul2 test
  

• 163aa50a
  by Ben Gamari at 2025-01-18T12:38:46-05:00

  testsuite: Add regression test for #25653
  

• 44778963
  by Matthew Pickering at 2025-01-20T11:23:08+00:00

  driver: Store an ExternalModuleGraph in the EPS
  
  We now store an ExternalModuleGraph in the EPS. When an new interface is
  loaded, the module graph is extended with a node for the loaded
  interface. The result is a partial module graph. If you want to run
  a transitive closure query on the graph you must first force the
  transitive closure to be loaded by using `loadExternalGraphBelow`.
  
  The primary advantage (for now) is that the transitive dependency
  calculation does not have to be repeated in getLinkDeps. If your module
  had many dependencies and many splices, performing this calculation at
  every splice site took a significant amount of time.
  
  We might also want to use this module graph in future for considering
  questions such as reachability of rules or accessibilty of instance
  imported by levelled imported.
  
  This patch removes another place in the compiler where transitive
  dependency is calculated in an ad-hoc manner. In general, the transitive
  dependency calculation should be cached and computed using a ModuleGraph
  abstraction.
  
  The transitive dependency query required by getLinkDeps operates on a
  graph without hs-boot nodes. If a linkable from a module in a loop is
  needed, then all modules in the loop are necessary to be available to
  execute that module. Therefore there is a query in `ModuleGraph` and
  `ExternalModuleGraph` which allows a transitive closure query to be
  performed on a graph without loops.
  
  Fixes #25634
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_Make
      MultiLayerModulesTH_OneShot
  Metric Increase:
      mhu-perf
  -------------------------
  
  Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>
  

• b3c0acfc
  by Cheng Shao at 2025-01-20T11:53:10-05:00

  hie: fix hie.yaml to use default hie-bios script
  
  !13778 accidentally changed hie.yaml to use hie-bios.bat as the
  default hie-bios script, which completely breaks hie support on
  non-Windows platforms. This patch reverts that change.
  

• 595013d4
  by Ben Gamari at 2025-01-21T09:57:23-05:00

  compiler: Fix CPP guards around ghc_unique_counter64
  
  The `ghc_unique_counter64` symbol was introduced in the RTS in the
  64-bit unique refactor (!10568) which has been backported to %9.6.7 and
  %9.8.4. Update the CPP to reflect this.
  
  Fixes #25576.
  

• 09ee3247
  by Ryan Scott at 2025-01-21T09:58:00-05:00

  Fix :info pretty-printing of UNPACKed fields
  
  This patch:
  
  * Ensures that we do not pretty-print a field like `foo :: {-# UNPACK #-} !Int`
    as `foo :: ! {-# UNPACK -#} Int` (as we were doing before) when running the
    `:info` command.
  * Prevents coercions that arise from `UNPACK`ed fields (e.g., such as when one
    unpacks a newtype) from being printed in `:info` output unless `-dppr-debug`
    is enabled.
  
  Fixes #25651.
  

• 6b7ea592
  by Rodrigo Mesquita at 2025-01-21T16:10:35-05:00

  driver: Store the HomePackageTable in a mutable reference
  
  This commit refactors the HomePackageTable and HomeUnitGraph:
  
  (1) It fixes a quadratic-in-the-number-of-modules space leak in upsweep (#25511)
  
  (2) And it reworks these structures into their own modules to simplify
      the driver. The refactor is driven by the introduction of IO in the HPT
      interface, but is a bit more aggressive in simplifying the
      interfaces to enforce correct usage (ie to avoid performance
      pitfalls).
  
  Specifically:
  
  - The `HomeUnitGraph` (HUG) is now in `GHC.Unit.Home.Graph`
  - The `HomePackageTable` (HPT) is now in `GHC.Unit.Home.PackageTable`
      - The HPT now stores an `IORef` with the table of loaded home package modules.
      - The interface to the HPT now requires IO
      - The interface now enforces that the HPT is a datastructure that
        only grows
      - This is not enforced in the interface, but, clients of the HPT
        should never care about there being more or less entries in the
        HPT when these additional entries are not relevant to their result.
      - The exception to the invariant that the HPT is monotonically
        increasing is `restrictHpt`, a function which is called at a
        "barrier point" (during which there are no other threads
        inspecting or inserting in the HPT). The invariant can be
        temporarily broken at this point (currently, after upsweep).
        This is safe because a single thread holds control over the
        structure (thus the invariant being broken is never observed).
  
  The hug_var and associated structures in the driver, which aimed to
  improve memory usage in the driver by updating in place a HUG during
  upsweep, are no longer required as the HPT entries in the HUG are now
  themselves mutable by construction. This was previously explained in
  Note [ModuleNameSet, efficiency and space leaks], which is no longer
  relevant and was deleted.
  
  Fixes #25511
  
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  
  -------------------------
  Metric Decrease:
      MultiComponentModulesRecomp
      MultiLayerModulesRecomp
  -------------------------
  

• f983a00f
  by Jens Petersen at 2025-01-21T16:11:12-05:00

  hp2ps/Utilities.c: add extern parameter types for malloc and realloc for C23
  
  Fix build with gcc-15 which defaults to C23 standard (-std=gnu23)
  Fixes #25662
  ```
  utils/hp2ps/Utilities.c:6:14: error:
       warning: conflicting types for built-in function ‘malloc’; expected ‘void *(long unsigned int)’ [-Wbuiltin-declaration-mismatch]
          6 | extern void* malloc();
            |              ^~~~~~
    |
  6 | extern void* malloc();
    |              ^
  utils/hp2ps/Utilities.c:5:1: error:
       note: ‘malloc’ is declared in header ‘<stdlib.h>’
          4 | #include "Error.h"
        +++ |+#include <stdlib.h>
          5 | 
    |
  5 | 
    | ^
  utils/hp2ps/Utilities.c: In function ‘xmalloc’:
  utils/hp2ps/Utilities.c:80:17: error:
       error: too many arguments to function ‘malloc’; expected 0, have 1
         80 |     r = (void*) malloc(n);
            |                 ^~~~~~ ~
     |
  80 |     r = (void*) malloc(n);
     |                 ^
  utils/hp2ps/Utilities.c:6:14: error:
       note: declared here
          6 | extern void* malloc();
            |              ^~~~~~
    |
  6 | extern void* malloc();
    |              ^
  utils/hp2ps/Utilities.c: In function ‘xrealloc’:
  utils/hp2ps/Utilities.c:92:18: error:
       warning: conflicting types for built-in function ‘realloc’; expected ‘void *(void *, long unsigned int)’ [-Wbuiltin-declaration-mismatch]
         92 |     extern void *realloc();
            |                  ^~~~~~~
     |
  92 |     extern void *realloc();
     |                  ^
  utils/hp2ps/Utilities.c:92:18: error:
       note: ‘realloc’ is declared in header ‘<stdlib.h>’
     |
  92 |     extern void *realloc();
     |                  ^
  utils/hp2ps/Utilities.c:94:9: error:
       error: too many arguments to function ‘realloc’; expected 0, have 2
         94 |     r = realloc(p, n);
            |         ^~~~~~~ ~
     |
  94 |     r = realloc(p, n);
     |         ^
  utils/hp2ps/Utilities.c:92:18: error:
       note: declared here
         92 |     extern void *realloc();
            |                  ^~~~~~~
     |
  92 |     extern void *realloc();
     |                  ^
  ```

• 51e3ec83
  by Vladislav Zavialov at 2025-01-22T20:41:32+03:00

  Rework built-in and punned names (#25174, #25179, #25180, #25182)
  
  This patch rewrites part of the logic for dealing with built-in and
  punned names, making it more principled and fixing a few bugs.
  
  * Kill off filterCTuple. Its purpose was to improve pretty-printing of
    constraint tuples, and the appropriate place for this is namePun_maybe.
  
  * Remove unitTyCon, unboxedUnitTyCon, and soloTyCon from wiredInTyCons.
    Their inclusion in the list was a workaround for shoddy logic in
    lookupOrigNameCache. Now we treat tuples of all arities uniformly.
  
  * In isBuiltInOcc_maybe, only match on actual built-in syntax, e.g. "FUN"
    shouldn't be there (#25174). Also take ListTuplePuns into account (#25179).
  
  * When matching OccNames, use the ShortByteString directly to avoid
    potentially costly conversions to ByteString and String.
  
  * Introduce isInfiniteFamilyOrigName_maybe, a purpose-built helper for
    looking up tuples/sums in the OrigNameCache. This clears up the previously
    convoluted relation between the orig name cache and built-in syntax.
  
  * Reuse isKnownOrigName_maybe to eliminate the need for isPunOcc_maybe.
  
  * Classify MkSolo and MkSolo# as UserSyntax, thus fixing whole-module
    reexports (#25182).
  
  * Teach valid-hole-fits about tuples, unboxed tuples, and unboxed sums,
    up to a certain arity (#25180).
  
  * Drop the unnecessary special case for unary constraint tuples in the
    type checker (finish_tuple). It was a workaround for the lack of CSolo.
  
  * Update Notes and other comments, add tests.
  

• 85c60aea
  by Teo Camarasu at 2025-01-23T18:06:21-05:00

  doc: Add documentation for -XDoAndIfThenElse
  
  Resolves #18631
  
  Co-authored-by: Richard Eisenberg <rae@cs.brynmawr.edu>
  

• 4495e48f
  by Brandon Chinn at 2025-01-24T11:54:24-05:00

  Break out GHC.Parser.Lexer.Interface
  

• 4f8fc11e
  by Brandon Chinn at 2025-01-24T11:54:24-05:00

  Fix lexing comments in multiline strings (#25609)
  
  Metric Decrease:
      MultiLayerModulesRecomp
      parsing001
  

• e7ab778f
  by Matthew Pickering at 2025-01-24T11:55:01-05:00

  testsuite: Pass TEST_HC_OPTS to many more tests
  
  This passes `-dno-debug-output` to the test and `-dlint.
  

• c3593101
  by Sylvain Henry at 2025-01-24T23:12:20-05:00

  Merge ghc-prim's modules into ghc-internal (#24453)
  
  ghc-internal becomes the only wired-in package exposing primitives.
  
  There are some minor GHC allocation regressions, but they barely cross
  the thresholds and only with the wasm backend. They're likely due to
  longer symbols (ghc-internal vs ghc-prim, GHC.Internal.X vs GHC.X).
  
  Metric Increase:
      T13035
      T1969
      T4801
      T9961
  

• 70f7741a
  by Jens Petersen at 2025-01-24T23:12:58-05:00

  hp2ps/Utilities.c: add extern parameter types for malloc and realloc for C23
  
  use portable C types!
  

• a1d92378
  by Brandon Chinn at 2025-01-25T15:11:54-08:00

  Fix for alex-3.5.2.0 (#25623)
  
  This INLINE pragma for alexScanUser was added in 9.12, but then I
  ported the change to alex in 3.5.2.0
  (https://github.com/haskell/alex/pull/262).
  
  I didn't realize that GHC errors on duplicate INLINE pragmas, so
  this ended up being a breaking change.
  
  This change should be backported into 9.12
  

• 62760367
  by ARATA Mizuki at 2025-01-27T16:23:06-05:00

  x86 NCG: Make MOVD's output format explicit
  
  The old design led to inference of a wrong format,
  losing upper bits of a vector register.
  
  Fixes #25659
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• f19ab490
  by Simon Hengel at 2025-01-27T16:23:45-05:00

  doc: Correct JSON schema for `-fdiagnostics-as-json` (fixes #25393)
  

• e16eae65
  by Cheng Shao at 2025-01-27T21:41:39+00:00

  hadrian: fix bootstrap with 9.12.1
  
  This patch bumps hadrian index-state to fix bootstrap with 9.12.1.
  

• 8071bad8
  by Jeffrey Young at 2025-01-28T21:45:32-05:00

  base: add SrcLoc changes to changelog, 4.21.0.0
  
  I accidentally dropped this in !13381
  
  - closes #25614
  
  See:
  
  - ea4587794b9e3a098f9c02bd6cea2294af2539ce  (the 13381 commit)
  - Issue #25614
  

• 9dcc7e28
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Rename `cloneBndrs` and such — now all the monadic ones have an `M` suffix.
  
  We now have `cloneBndrs` and `cloneRecIdBndrs` which take a `UniqSupply` argument, and `cloneBndrsM` and `cloneRecIdBndrsM` which rather have a `MonadUnique` constraint.
  

• 643dd3d8
  by Matthew Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Use `Infinite` in unique generation, and clean up some other partial uni patterns as well.
  
  Also drop the losing `instance MonadFail UniqSM`.
  
  We redefine `getUniquesM` in terms of `Infinite` rather than `[]`, and define another method `getUniqueListM` for the use sites where we actually want a `[]`.
  Thus, at many sites, we can avoid the partiality of the empty list case.
  
  We also define `withUniques`, `withUniquesM`, and `withUniquesM'`, which traverse an arbitrary `Traversable` structure and introduce a `Unique` for each element.
  This allows us to redefine various functions to operate on more appropriate types than `[]` and avoid further partiality (in the form of incomplete-uni-patterns).
  

• dd0acc3c
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Use `Infinite` in `GHC.Tc.Deriv.Functor`.
  
  Make the list of variables to use in generated code `Infinite`, to avoid panicking on the (now impossible) empty list case.
  

• 4e9adedf
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Use `Infinite` in `GHC.Runtime.Debugger`.
  
  Make the list of available names `Infinite`, to avoid panicking on the (now impossible) empty list case.
  

• bed812b7
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Avoid incomplete-uni-patterns in `GHC.Cmm.DebugBlock`.
  
  We do so by changing the type of `BlockContext` to statically (in GHC) exclude the possibility of Cmm statics, and using `NonEmpty` lists of `BlockContext`s in `cmmDebugGen`.
  

• 27587df3
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Avoid incomplete-uni-patterns in `GHC.Types.Literal`.
  
  We do so by introducing `mkLitNumberWrap'` whose ultimate codomain is `Integer` rather than `Literal`, and then use that rather than `mkLitNumberWrap` where we just need the number rather than the `Literal`.
  

• 138de0ff
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Avoid incomplete-uni-patterns in `GHC.CmmToAsm.X86.CodeGen`.
  
  - Match the vector element list only once in `shuffleInstructions`.
  - Define `isSuitableFloatingPointLit_maybe` which returns `Just` the width if the lit is indeed suitable.
  

• d8cb3d36
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Clean up more incomplete uni patterns.
  
  At some sites, we merely panic if the `[]` or `Maybe` is empty when we convert to `NonEmpty` or `Identity`, but at least now we make it explicit.
  
  At other sites, we are able to use more precise types and avoid the partiality altogether. To do so, we redefine various functions to operate over `Traversable` arguments, so we can use the appropriate shape where known.
  

• f251bd22
  by M Farkas-Dyck at 2025-01-29T02:27:48-05:00

  Outline `expectJustPanic`.
  

• a963a1a5
  by Marc Scholten at 2025-01-29T02:28:35-05:00

  base: Introduce Data.Enum.enumerate (CLC #306)
  
  https://github.com/haskell/core-libraries-committee/issues/306
  

• 944712da
  by Ben Gamari at 2025-01-29T02:29:13-05:00

  base: Update description of locking behavior

• 85abc69c
  by Ben Gamari at 2025-01-29T02:29:51-05:00

  base: Fix @since annotation of Data.Bounded
  
  Fixes #25615.
  

• 2ca41c62
  by Ben Gamari at 2025-01-29T02:30:29-05:00

  StgToByteCode: Fix overly-broad handling of Addr# literals
  
  Previously we assumed that all unlifted types were `Addr#` but this
  isn't true. As noted in #25638, unlifted nullary data constructor
  workers can also appear at the top-level and are obviously not of type
  `Addr#`.
  
  Note that there is more work to be done to properly handle unlifted data
  constructors (especially nullary; see #25636). However, this is a small
  step in the right direction.
  
  Closes #25641.
  

• ec26c54d
  by Ben Gamari at 2025-01-29T02:30:29-05:00

  StgToByteCode: Assert that PUSH_G'd values are lifted
  
  We currently do not support top-level unlifted data constructor applications,
  therefore this is a safe assertion.
  
  Pointed out by @sheaf.

• 8847125f
  by Ben Gamari at 2025-01-29T02:31:07-05:00

  gitlab-ci: Run test-primops testsuite in ~"full-ci" pipeline
  
  Closes #25654.
  

• bf8c7d6e
  by Matthew Pickering at 2025-01-29T02:31:44-05:00

  bytecode: Do not generate `SLIDE x 0` instructions
  
  SLIDE x 0 is a no-op as it means to shift x elements of the stack by no
  spaces. In the interpreter, this results in a loop which copies an array
  element into the same place.
  
  I have instrumented GHCi to count how many of these instructions are interpreted.
  The workload was `ghc` compiling two simple modules.
  
  Total no-op slides: 7793476
  Total slides: 11413289
  Percentage useless (slides): 68%
  Percentage uselss of total instructions: 9%
  

• 7bfc93a7
  by Zubin Duggal at 2025-01-29T21:41:17-05:00

  hackage-doc-tarball: Allow ghc-boot-th to be uploaded to hackage
  
  It can't refer to files outside its source directory, so patch that part out.
  This is OK because those files are only used while bootstrapping.
  
  Also add ghci to the list of packages to be uploaded
  
  Fixes #25687
  

• 704eeb02
  by Roman S at 2025-01-29T21:42:05-05:00

  Fix Control.Arrow (***) diagram (fixes #25698)

• 662645f0
  by Matthew Pickering at 2025-02-03T11:44:41-05:00

  compiler: Always load GHC.Data.FastString optimised into GHCi
  
  The FastString table is shared between the boot compiler and interpreted
  compiler. Therefore it's very important the representation of
  `FastString` matches in both cases. Otherwise, the interpreter will read
  a FastString from the shared variable but place the fields in the wrong
  place which leads to segfaults.
  
  Ideally this state would not be shared, but for now we can always
  compile both with `-O2` and this leads to a working interpreter.
  

• 05e5785a
  by Peter Trommler at 2025-02-03T11:45:17-05:00

  RTS: Fix compile on powerpc64 ELF v1
  
  Cabal does not know about the different ABIs for powerpc64 and compiles
  StgCRunAsm.S unconditionally. The old make-based build system excluded
  this file from the build and it was OK to signal an error when it was
  compiled accidentally.
  
  With this patch we compile StgCRunAsm.S to an empty file, which fixes
  the build.
  
  Fixes #25700
  

• cbbb64fb
  by Matthew Pickering at 2025-02-03T23:40:33-05:00

  interpreter: Always print unit and module name in BCO_NAME instruction
  
  Currently the BCO_Name instruction is a bit difficult to use since the
  names are not qualified by the module they come from. When you have a
  very generic name such as "wildX4", it becomes impossible to work out
  which module the identifier comes from.
  
  Fixes #25694
  

• 764a43ac
  by Ben Gamari at 2025-02-03T23:41:10-05:00

  upload-ghc-libs: Drop more references to ghc-internal from ghc-boot-th
  
  
  (cherry picked from commit afec4b75c2d0e9f5c462a86d9f3697acf30355c7)
  
  Co-authored-by: Ben Gamari <bgamari.foss@gmail.com>

• 9a59b026
  by Ben Gamari at 2025-02-04T10:00:18-05:00

  gitlab-ci: Don't use .full-ci to run test-primops
  
  test-primops depends upon the existence of validate jobs, yet these do
  not exist in the context of nightly jobs, which .full-ci includes.
  

• 7cc08550
  by Ben Gamari at 2025-02-04T18:34:49-05:00

  CorePrep: Name `sat` binders more descriptively
  

• fb40981d
  by Ben Gamari at 2025-02-04T18:35:26-05:00

  ghc-toolchain: Parse i686 triples
  
  This is a moniker used for later 32-bit x86 implementations
  (Pentium Pro and later).
  
  Fixes #25691.
  

• 02794411
  by Cheng Shao at 2025-02-04T18:36:03-05:00

  compiler: remove unused assembleOneBCO function
  
  This patch removes the unused assembleOneBCO function from the
  bytecode assembler.
  

• db19c8a9
  by Matthew Pickering at 2025-02-05T23:16:50-05:00

  perf: Replace uses of genericLength with strictGenericLength
  
  genericLength is a recursive function and marked NOINLINE. It is not
  going to specialise. In profiles, it can be seen that 3% of total compilation
  time when computing bytecode is spend calling this non-specialised
  function.
  
  In addition, we can simplify `addListToSS` to avoid traversing the input
  list twice and also allocating an intermediate list (after the call to
  reverse).
  
  Overall these changes reduce the time spend in 'assembleBCOs' from 5.61s
  to 3.88s. Allocations drop from 8GB to 5.3G.
  
  Fixes #25706
  

• 5622a14a
  by Matthew Pickering at 2025-02-05T23:17:27-05:00

  perf: nameToCLabel: Directly manipulate ByteString rather than going via strings
  
  `nameToCLabel` is called from `lookupHsSymbol` many times during
  bytecode linking. We can save a lot of allocations and time by directly
  manipulating the bytestrings rather than going via intermediate lists.
  
  Before: 2GB allocation, 1.11s
  After: 260MB allocation, 375ms
  
  Fixes #25719
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_OneShot
  -------------------------
  

• 66c7f656
  by Matthew Pickering at 2025-02-06T17:15:25-05:00

  interpreter: Fix INTERP_STATS profiling code
  
  The profiling code had slightly bitrotted since the last time it was
  used. This just fixes things so that if you toggle the INTERP_STATS
  macro then it just works and prints out the stats.
  
  Fixes #25695
  

• f71c2835
  by Matthew Pickering at 2025-02-06T17:16:02-05:00

  perf: Key the interpreter symbol cache by Name rather than FastString
  
  Profiles showed that about 0.2s was being spend constructing the keys
  before looking up values in the old symbol cache.
  
  The performance of this codepath is critical as it translates directly
  to a delay when a user evaluates a function like `main` in the
  interpreter.
  
  Therefore we implement a solution which keys the cache(s) by `Name`
  rather than the symbol directly, so the cache can be consulted before
  the symbol is constructed.
  
  Fixes #25731
  

• 8f8d3a90
  by Ben Gamari at 2025-02-08T01:17:28-05:00

  base: Label threads forked by IO operations
  
  Addresses part of #25452.
  
  Addresses core-libraries-committee#305.
  

• 28600825
  by Ben Gamari at 2025-02-08T01:17:28-05:00

  base: Label threads forked by System.Timeout
  
  Addresses part of #25452.
  
  Addresses core-libraries-committee#305.
  

• 8a249827
  by Ben Gamari at 2025-02-08T01:17:28-05:00

  base: Label signal handling threads
  
  Addresses part of #25452.
  
  Addresses core-libraries-committee#305.
  

• 26af26f0
  by Ben Gamari at 2025-02-08T01:17:28-05:00

  base: Label Windows console event handling threads
  
  Addresses part of #25452.
  
  Addresses core-libraries-committee#305.
  

• bf9c3d4f
  by Ben Gamari at 2025-02-08T01:17:28-05:00

  ghci: Label evaluation sandbox thread
  
  Addresses part of #25452.
  
  Addresses core-libraries-committee#305.
  

• 38f78ce5
  by Ben Gamari at 2025-02-08T01:17:28-05:00

  base: Add changelog entry for addition of thread labels
  
  Addresses #25452.
  
  Addresses core-libraries-committee#305.
  

• c100deb5
  by Ben Gamari at 2025-02-08T01:18:05-05:00

  gen-ci: Clean up style
  
  This cleans up a number of stylistic inconsistencies although it's still
  far from perfect.
  

• c4a7680a
  by Ben Gamari at 2025-02-08T01:18:05-05:00

  gen-ci: Properly encapsulate GitLab predicates
  

• 52b6539b
  by M Farkas-Dyck at 2025-02-08T11:34:51-08:00

  Avoid partiality in `Language.Haskell.Syntax.Expr`, `GHC.Hs.Expr`, `GHC.Rename.Expr`, etc.
  
  In particular, use `NonEmpty` where appropriate:
  - the argument of `FieldLabelString`
  - the argument of `HsMultiIf`
  - `grhssGRHSs`
  
  Decreases overall compile-time allocation by about 0.1% in the benchmark suite (min -0.8%, max +0.3%).
  
  Metric Decrease:
      T3294
  

• a566da92
  by Ben Gamari at 2025-02-10T03:21:49-05:00

  gitlab-ci: Bump docker images
  
  Closes #25693.
  

• a7e23f01
  by Ben Gamari at 2025-02-10T03:21:49-05:00

  hadrian: Drop uses of head/tail
  
  To silence warnings with GHC 9.10
  

• 12752f0c
  by Ben Gamari at 2025-02-10T03:21:49-05:00

  hadrian: Disable x-data-list-nonempty-unzip warning
  

• e22a14fc
  by Simon Peyton Jones at 2025-02-11T16:21:10+00:00

  Deal correctly with Given CallStack constraints
  
  As #25675 showed, the CallStack solving mechanism was failing
  to account for Given CallStack constraints.
  
  This small patch fixes it and improves the Notes.
  
  Small improvement to GHCi debugger output in break011, break024,
  which is discussed on the MR !13883
  

• db3e810f
  by Simon Peyton Jones at 2025-02-12T09:12:30-05:00

  Fix inlineBoringOk again
  
  This MR fixes #25713, which turned out to be a consequence of not
  completing #17182.
  
  I think I have now gotten it right.  See the new
    Note [inlineBoringOk]
  

• ef0e6cfc
  by Ben Gamari at 2025-02-17T19:20:09-05:00

  testsuite: Mark T23071 and T2047 as fragile on FreeBSD
  
  These inexplicably fail on FreeBSD on CI. Sadly I am unable to reproduce
  this locally but regardless this is holding up Marge so I will mark them
  as fragile for now.
  
  Addresses #25751.
  

• 7596675e
  by Jens Petersen at 2025-02-18T08:53:08-05:00

  hp2ps Utilities.c: include stdlib.h instead of extern malloc and realloc
  

• 975d932c
  by Rodrigo Mesquita at 2025-02-18T08:53:45-05:00

  Inline join points for rhs without free vars
  
  While investigating #25170, we ran into a program (T16473) that allocated 67%
  more because of a join point that failed to inline.
  
  Note [Duplicating join points] explains why we want to be conservative
  when inlining join points, using as an example a join point that
  captures a free variable `f` that becomes available in the continuation
  `blah` for further optimisations, as opposed to being lambda-abstracted.
  
  However, when the RHS of the join point has no free variables and is
  trivial, the same argument does not apply, and there's nothing to gain
  from preserving it.
  
  On the contrary, not inlining these trivial join points such as
      $j f x = K f x |> co
  can be actively harmful as they prevent useful optimisations from firing
  on the known constructor application. #25723 is such an example.
  
  Therefore, we've extended `uncondInlineJoin` to allow duplicating such closed
  trivial join points. See the updated Note [Duplicating join points] for
  further details.
  
  Additionally, merge the guards in uncondInlineJoin for point DJ3(b) anad DJ3(c) of
  Note [Duplicating join points] to avoid an unnecessary traversal in the
  call to `collectArgs`; it's also more uniform.
  
  Co-authored-by: Simon Peyton Jones <simon.peytonjones@gmail.com>
  
  Fixes #25723
  

• 78de1a55
  by M Farkas-Dyck at 2025-02-18T08:54:31-05:00

  Scrub some partiality in `GHC.Tc.Gen.Match`.
  
  In particular, we construct a list of the same length as another list, then loop over both and panic if their lengths are unequal. We can avoid this.
  

• 1dfe9325
  by M Farkas-Dyck at 2025-02-18T08:54:31-05:00

  Make list of `ParStmtBlock` in `ParStmt` `NonEmpty`.
  
  In the ParStmt constructor Language.Haskell.Syntax.Expr.StmtLR, the 2nd argument, the list of ParStmtBlocks, must be NonEmpty; make it so.
  

• 0e3575b5
  by M Farkas-Dyck at 2025-02-18T08:54:31-05:00

  GHC.Tc.Gen.Match: Added type signatures for `loop` functions.
  

• c9ffcfee
  by sternenseemann at 2025-02-18T08:55:14-05:00

  GHC: fix reference to function in Note [Target code interpreter]
  
  As far as I could tell, setSessionDynFlags doesn't deal with hsc_interp.
  Also added a backreference so this will be updated in the future.
  

• ab77fc8c
  by sheaf at 2025-02-18T08:55:57-05:00

  Account for skolem escape in mightEqualLater
  
  This commit:
  
    1. Refactors checkTyEqRhs to allow it be called in pure contexts,
       which means it skips doing any on-the-fly promotion.
    2. Calls checkTyEqRhs in mightEqualLater to check whether it a
       MetaTv can unify with a RHS or whether that would cause e.g.
       skolem escape errors or concreteness errors.
  
  Fixes #25744
  

• cb8a06a4
  by Sylvain Henry at 2025-02-18T08:56:52-05:00

  Remove a bunch of Makefiles from old build system
  

• e12d6b39
  by M Farkas-Dyck at 2025-02-18T08:57:37-05:00

  Totalize `GHC.HsToCore.Match.matchWrappers.initNablasGRHSs`.
  
  Converting from `NonEmpty` to `[]` and back is totally needless.
  

• cd2be3be
  by Matthew Pickering at 2025-02-18T08:58:14-05:00

  interpreter: Always print uniques for BCO_NAME labels
  
  In the previous commit I omitted to include the unique, which still
  makes it very difficult to trace back where the BCO came from.
  

• c4e112fc
  by Matthew Pickering at 2025-02-18T08:58:51-05:00

  interpreter: Fix overflows and reentrancy in statistics calculation
  
  1. Use unsigned long for counter, as they can easily overflow if you are
     running a long benchmark.
  2. Make interp_shutdown reentrant by copying the command frequency table
     into an array.
  
  Fixes #25756
  

• 70ac6222
  by M Farkas-Dyck at 2025-02-18T14:22:06-08:00

  Use `Foldable1` where appropriate, avoiding much needless panicking.
  
  In some cases, where not readily feasible to modify code to use `NonEmpty`, merely use `expectNonEmpty` to make explicit we are panicking if we have an empty list.
  

• a3f0a506
  by Sylvain Henry at 2025-02-19T05:27:30-05:00

  Testsuite: fix deprecation warning
  
  > DeprecationWarning: 'count' is passed as positional argument
  

• ef5470a2
  by Ben Gamari at 2025-02-19T16:30:53+00:00

  Cmm/Parser: Add surface syntax for Mul2 MachOps
  
  These are otherwise very hard to test in isolation.
  

• 59b9307b
  by Cheng Shao at 2025-02-19T20:24:40-05:00

  testsuite: fix InternalCounters test with +debug_ghc
  
  The `InternalCounters` test case fails when ghc is built with
  `+debug_ghc`. This patch skips it in that case and allows the
  testsuite to pass for the `+debug_ghc` flavour transformer.
  

• aa69187d
  by M Farkas-Dyck at 2025-02-19T20:25:31-05:00

  Scrub a use of `head` in `GHC.Driver.Make.downsweep_imports.checkDuplicates`.
  

• 1c8e608a
  by Cheng Shao at 2025-02-21T20:18:41-05:00

  compiler: use fromAscList when applicable
  
  This patch uses fromAscList (with O(n) complexity) instead of fromList
  (with O(nlogn) complexity) in certain Binary instances. It's safe to
  do so since the corresponding serialization logic is based on toList
  (same as toAscList).
  

• 549e0aff
  by Ben Gamari at 2025-02-21T20:19:18-05:00

  rts/linker/MachO: Mark internal symbols as static
  
  There is no reason why these should have external linkage.
  

• fbf3d020
  by Cheng Shao at 2025-02-22T07:41:01-05:00

  wasm: bump dyld v8 heap size limit
  
  This patch sets `--max-old-space-size=65536` as wasm dyld shebang
  arguments to lessen v8 heap pressure in certain workloads that load
  the full ghc package. It doesn't really commit 64G memory but it does
  help reduce v8 gc overhead.
  

• cb60da24
  by Cheng Shao at 2025-02-22T07:41:01-05:00

  wasm: fix dyld for shared libraries created by llvm 20.x
  
  This patch fixes wasm dyld script for shared libraries created by llvm
  20.x. The __wasm_apply_data_relocs function is now optional and may be
  omitted for shared libraries without any runtime relocatable data
  segments, so only call __wasm_apply_data_relocs when it's present.
  

• 7eea38c8
  by Cheng Shao at 2025-02-22T07:41:37-05:00

  driver: fix wasm backend sysroot lookup logic when -flto is passed
  
  For the wasm target, the driver calls `wasm32-wasi-clang
  --print-search-dirs` and finds the sysroot directory that contains
  libc.so etc, then passes the directory path to dyld. However, when GHC
  is configured with -flto as a part of C/C++ compiler flags, the clang
  driver would insert a llvm-lto specific directory in the
  --print-search-dirs output and the driver didn't take that into
  account. This patch fixes it and always selects the non-lto sysroot
  directory to be passed to dyld. This is one small step towards
  supporting building all cbits with lto for wasm.
  

• f3bfe31e
  by Cheng Shao at 2025-02-23T14:06:25-05:00

  wasm: add Note [Variable passing in JSFFI] as !13583 follow up
  
  This patch adds a note to explain how the magic variables like
  `__ghc_wasm_jsffi_dyld` are brought into scope of JSFFI code snippets,
  as follow up work of !13583.
  

• c318be56
  by Cheng Shao at 2025-02-23T14:07:02-05:00

  libffi: update to 3.4.7
  
  Bumps libffi submodule.
  

• 33aca30f
  by sheaf at 2025-02-25T08:58:46-05:00

  LLVM: account for register type in funPrologue
  
  We were not properly accounting for the live register type of
  global registers in GHC.CmmToLlvm.CodeGen.funPrologue. This meant that
  we could allocated a register at type <4 x i32> but try to write to it
  at type <8 x i16>, which LLVM doesn't much like.
  
  This patch fixes that by inserting intermerdiate casts when necessary.
  
  Fixes #25730
  

• 0eb58b0e
  by sheaf at 2025-02-25T08:59:29-05:00

  base: make Data.List.NonEmpty.unzip match Data.List
  
  This commit makes Data.List.NonEmpty.unzip match the implementation
  of Data.List, as was suggested in approved CLC proposal #107.
  

• f4da90f1
  by Matthew Pickering at 2025-02-25T14:11:21-05:00

  interpreter: Fix underflow frame lookups
  
  BCOs can be nested, resulting in nested BCO stack frames where the inner most
  stack frame can refer to variables stored on earlier stack frames via the
  PUSH_L instruction.
  
  |---------|
  |  BCO_1  | -<-┐
  |---------|
   .........     |
  |---------|    | PUSH_L <n>
  |  BCO_N  | ->-┘
  |---------|
  
  Here BCO_N is syntactically nested within the code for BCO_1 and will result
  in code that references the prior stack frame of BCO_1 for some of it's local
  variables. If a stack overflow happens between the creation of the stack frame
  for BCO_1 and BCO_N the RTS might move BCO_N to a new stack chunk while leaving
  BCO_1 in place, invalidating a simple offset based reference to the outer stack
  frames.
  Therefore `ReadSpW` first performs a bounds check to ensure that accesses onto
  the stack will succeed. If the target address would not be a valid location for
  the current stack chunk then `slow_spw` function is called, which dereferences
  the underflow frame to adjust the offset before performing the lookup.
  
                 ┌->--x   |  CHK_1  |
  |  CHK_2  |    |    |   |---------|
  |---------|    |    └-> |  BCO_1  |
  | UD_FLOW | -- x        |---------|
  |---------|    |
  | ......  |    |
  |---------|    | PUSH_L <n>
  |  BCO_ N | ->-┘
  |---------|
  
  Fixes #25750
  

• c3f2d284
  by Vladislav Zavialov at 2025-02-25T14:11:58-05:00

  Remove ArgPatBuilder
  
  ArgPatBuilder in Parser/PostProcess.hs became redundant with the
  introduction of InvisPat (36a75b80eb).
  
  This small refactoring removes it.
  

• 0f2241e9
  by sheaf at 2025-02-25T19:23:21-05:00

  Propagate long distance info to guarded let binds
  
  This commit ensures that we propagate the enclosing long distance
  information to let bindings inside guards, in order to get accurate
  pattern-match checking warnings, in particular incomplete record
  selector warnings.
  
  Example:
  
    data D = K0 | K1 { fld :: Int }
    f :: D -> Int
    f d@(K1 {})
      | let i = fld d
      = i
    f _ = 3
  
  We now correctly recognise that the field selector 'fld' cannot fail,
  due to the outer pattern match which guarantees that the value 'd' has
  the field 'fld'.
  
  Fixes #25749
  

• 64b0d4d0
  by Fangyi Zhou at 2025-02-25T19:24:07-05:00

  wasm: use primitive opcodes for fabs and sqrt
  
  - Add new `WasmInstr` constructor `WasmSqrt` for sqrt, corresponding to
    primitivie operations in wasm.
  - When lowering CallishMachOp, use `WasmAbs` and `WasmSqrt` for F32 and
    F64 fabs and sqrt.
  

• 272eaef0
  by Cheng Shao at 2025-02-25T19:24:43-05:00

  hadrian: enable building stage1 haddock for cross ghc
  
  This commit enables building stage1 haddock for cross ghc. Without
  this change, hadrian would panic with "Unknown program" error when
  building the _build/stage1/bin/cross-prefix-haddock program needed by
  the docs-haddock target, even if it only needs to copy from
  _build/stage0/bin/cross-prefix-haddock.
  

• a794e733
  by Cheng Shao at 2025-02-25T19:24:43-05:00

  hadrian: enable building docs for cross targets
  
  Hadrian used to omit the docs target as a part of binary-dist-dir for
  cross targets. This commit enables docs to be built as a part of cross
  bindists and it works just fine in CI.
  

• 6dba56e1
  by Cheng Shao at 2025-02-25T19:24:43-05:00

  ci: build haddock/sphinx-html for wasm jobs
  
  This commit enables building haddock & sphinx-html documentation for
  wasm targets. The docs are useful for end users and should be tested
  in CI.
  
  I've omitted pdf & manpage generation for the wasm target; I've never
  found the pdf version of docs to be useful, and the manpage only
  contains `ghc.1` where we really want `wasm32-wasi-ghc.1` but that
  should be a separate issue to fix.
  

• 2d6a63ab
  by Cheng Shao at 2025-02-25T19:25:20-05:00

  ghci: remove unused showBreakArray function
  
  GHCi.BreakArray.showBreakArray is not used anywhere, hence the
  housecleaning.
  

• b228fcb5
  by Cheng Shao at 2025-02-25T19:25:57-05:00

  ghc-heap: fix HalfWord incompatible Binary instances for cross GHC
  
  ghc-heap defines HalfWord as Word32/Word16 depending on host word
  size. For cross GHC with different host/target word sizes, the Binary
  instances are incompatible and breaks iserv serialization of any
  message type that involves HalfWord, breaking the ghci debugger. This
  patch fixes the issue and has been tested to fix ghci debugger
  functionality of the wasm backend. Fixes #25420 #25781.
  

• ec02f8c2
  by Rodrigo Mesquita at 2025-02-26T11:03:38-05:00

  ghci-debugger: display thunks provenance if avail
  
  Improves reporting on ghci breakpoints when IPE information is available
  by printing, next to the thunk, the source file and src span where the
  thunk originated.
  
  Closes #25746
  

• 6acaff2b
  by Vladislav Zavialov at 2025-02-26T11:04:15-05:00

  Tidy up error messages for TypeAbstractions
  
  1. Print the '@' symbol before invisible patterns and improve phrasing:
  
        T24557c.hs:8:4: error: [GHC-11983]
       -    Invisible type pattern pat is not allowed here
       +    Illegal invisible type pattern: @pat
       +    An invisible type pattern must occur in an argument position.
  
  2. Use a single error code for all type abstractions deemed illegal
     due to the TypeAbstractions extension being disabled.
  
     Before this change:
       * [GHC-78249] was used in function equations, lambdas
       * [GHC-17916] was used in constructor patterns
  
     After this change:
       * [GHC-78249] is used to report all illegal type abstractions
       * [GHC-17916] is no longer used
  
     There was no reason for both error codes to exist and this distinction
     was a source of complexity in GHC/Tc/Errors/* and GHC/Rename/Pat.hs
  
  3. Group the different "invisible type pattern" error constructors
     under a single parent constructor, TcRnIllegalInvisibleTypePattern
     containing BadInvisPatReason
  

• 1ce9502e
  by Ben Gamari at 2025-02-27T04:48:29-05:00

  haddock/doc: Drop version and release
  
  We currently have no way of keeping this up-to-date with the project version

• 7f358f25
  by Matthew Pickering at 2025-02-27T04:49:06-05:00

  testsuite: Add test for :steplocal performance
  
  This adds a simple test which exercises #25779
  

• a6a3ffa6
  by Sven Tennie at 2025-02-27T23:34:47-05:00

  Do not deallocate stack for jump/switch table jumps
  
  Though the name is misleading, we consider them to be branching. For
  branch instructions we do not deallocate (parts of) the stack, but keep
  the stack pointer (sp) intact.
  

• 39e51ddb
  by Sven Tennie at 2025-02-27T23:34:47-05:00

  Add reproducer for dealloc instructions in switch table jump expressions (#25733)
  
  Measures taken to make the test stable:
  
  - Use 'a' as variable prefix, because X86 32bit stumbled over the
  variable name 'i386'
  - Flush stdout to make test output deterministic
  - Use type annotations to support 32bit archs
  

• d427df93
  by Sylvain Henry at 2025-02-27T23:35:30-05:00

  Remove redundant location strings in expectJust and friends (#25743)
  
  Now we can use HasDebugCallStack instead to avoid cluttering the code
  with strings and to avoid maintaining those strings (e.g. renaming them
  when functions are renamed...).
  

• 90f1190e
  by Ben Gamari at 2025-02-28T20:53:53-05:00

  compiler: Add export list to GHC.SysTools.Tasks
  

• ec826009
  by Ben Gamari at 2025-02-28T20:53:53-05:00

  compiler: Pass --target to llvm-as
  
  As noted in #25793, this is necessary due to potential ambiguity on
  Apple machines with Rosetta.
  

• 9c1647d1
  by Andreas Klebinger at 2025-02-28T20:54:30-05:00

  cmmMachOpFoldM: Add missing pattern matches for bitcasts.
  
  Fixes #25771
  

• 3b78e139
  by John Ericson at 2025-03-03T15:27:39-05:00

  Remove most of `GHC.Internal.Pack`
  
  Since bd82ac9f4716e28b185758ae514691d5a50c003f when `GHC.Pack` was
  deleted, it is no longer used except for one function by the RTS.
  

• b4fe0850
  by Rodrigo Mesquita at 2025-03-03T15:28:16-05:00

  ghci: Don't set virtualCWD on every iteration
  
  The calls to withVirtualCWD were introduced to fix #2973, but this bug
  is no longer reproducible, even when `withVirtualCWD` is dropped.
  
  This cleanup was originally motivated by the performance of :steplocal,
  but the performance problem has now been fixed at its root in the next
  commit.
  
  Even then, `withVirtualCWD` seems to now be an unnecessary artifact, and
  removing it simplifies the interpreter with no apparent drawbacks (testsuite is
  also happy with this change)
  

• 73ba1e6e
  by Rodrigo Mesquita at 2025-03-03T15:28:16-05:00

  ghci debugger: improve break/resume control flow
  
  After interpreting bytecode (`evalStmt`), we may want to hand off
  control to "GHCi.UI" in order to display an interactive break prompt:
  
  1. When an /active/ breakpoint (one set with :break ...) is hit
  2. At any breakpoint, when using :step from a breakpoint
  3. At any breakpoint in the same function f, when :steplocal is called
    from a breakpoint in f
  4. At any breakpoint in the same module, when :stepmodule is used
  
  Whether to pass control to the UI is now fully determined by
  `handleRunStatus` which transforms an `EvalStatus_` into an
  `ExecResult`. When `ExecBreak` is returned from `handleRunStatus` to
  GHCi, it always means GHCi breaks.
  
  `handleRunStatus` determines whether to loop and resume evaluation right away, or
  when to return to GHCi (by returning `ExecBreak` or `ExecComplete`).
  - (1) is queried using the `BreakpointStatus` message (the
    `breakpointStatus` call)
  - (2,3,4) are determined by the predicate `breakHere step span`, which
    inspects the improved `SingleStep` type to determine whether we care
    about this breakpoint even if it is not active.
  
  This refactor solves two big performance problems with the previous control flow:
  - We no longer call `withArgs/withProgram` repeatedly in the
    break/resume loop, but rather just once "at the top".
  - We now avoid computing the expensive `bindLocalsAtBreakpoint` for
    breakpoints we'd never inspect.
  
  In the interpreter_steplocal test added, calling `:steplocal` after breaking on `main = fib 25`
  now takes 12 seconds rather than 49 seconds on my machine.
  
  ```
  interpreter_steplocal(ghci) ghc/alloc  6,124,821,176    540,181,392 -91.2% GOOD
  ```
  
  Fixes #25779
  
  -------------------------
  Metric Decrease:
      interpreter_steplocal
  -------------------------
  

• c78d8f55
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  rts: fix top handler closure type signatures
  
  This commit fixes the runIO/runNonIO closure type signatures in the
  RTS which should be extern StgClosure. This allows us to remove an
  unnecessary type cast in the C foreign desugaring logic, as well as
  unneeded complications of JSFFI desugaring logic that also needs to
  generate C stubs that may refer to those top handler closures.
  Otherwise, we'll have to take special care to avoid generating "extern
  StgClosure" declarations for them as we would for other closures, just
  to avoid conflicting type signature error at stub compile time.
  

• a204df3a
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  compiler: allow arbitrary label string for JSFFI exports
  
  This commit allows arbitrary label string to appear in a foreign
  export declaration, as long as the calling convention is javascript.
  Well, doesn't make sense to enforce it's a C function symbol for a
  JSFFI declaration anyway, and it gets in the way of implementing the
  "sync" flavour of exports.
  

• 03ebab52
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  compiler: wasm backend JSFFI sync exports
  
  This commit implements the synchronous flavour of the wasm backend
  JSFFI exports:
  
  - `foreign export javascript "foo sync"` exports a top-level Haskell
    binding as a synchronous JS function
  - `foreign import javascript "wrapper sync"` dynamically exports a
    Haskell function closure as a synchronous JS function
  - `foreign import javascript unsafe` is now re-entrant by lowering to
    a safe ccall
  - Also fix the issue that JSFFI dynamic exports didn't really work in
    TH & ghci (#25473)
  

• b6ae908b
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  testsuite: test wasm backend JSFFI sync exports
  
  This commit repurposes some existing JSFFI test cases to make them
  cover JSFFI sync exports as well.
  

• edae2874
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  docs: document wasm backend JSFFI sync exports
  
  This commit updates wasm backend documentation to reflect the new
  JSFFI sync exports feature.
  

• 9b54eecb
  by Cheng Shao at 2025-03-03T20:56:21+00:00

  wasm: add error message to WouldBlockException
  
  This commit attaches an error message to WouldBlockException, for now
  the error message consists of the JS async import code snippet that
  thunk is trying to block for. This is useful for debugging synchronous
  callbacks that accidentally call an async JS function.
  

• c331eebf
  by Cheng Shao at 2025-03-04T09:11:45-05:00

  compiler: avoid overwriting existing writers in putWithTables
  
  This patch makes `putWithTables` avoid overwriting all existing
  UserData writers in the handle. This is crucial for GHC API users that
  use putWithUserData/getWithUserData for serialization logic that
  involve Names.
  

• e9b7802b
  by Matthew Pickering at 2025-03-04T09:12:21-05:00

  ghci: Serialise mi_top_env
  
  When loading core from interface files (or from a bytecode object in
  future) it's important to store what the top-level context of a module
  is.
  Otherwise, when you load the module into GHCi from the interface files,
  only exported identifiers from the top-level module are in scope on the
  repl.
  
  See the added test which demonstrates what this enables.
  
  The context at the GHCi prompt is everything that's in-scope in the
  TopEnvIface module. Since TopEnvIface imports identifier "a", we can
  evaluate "a" in the repl.
  
  In addition to all this, we can use this information in order to
  implement reifyModule in a more principled manner.
  
  This becomes even more important when you're debugging and what to set
  break-points on functions which are not imported.
  

• 73e02068
  by Matthew Pickering at 2025-03-04T09:12:21-05:00

  Implement reifyModule in terms of mi_top_env
  
  mi_top_env provides precisely the information that reifyModule needs,
  the user written imports.
  
  This is important as it unblocks !9604 and #22188
  
  Fixes #8489
  

• 0a99825d
  by Ben Gamari at 2025-03-04T09:12:57-05:00

  hadrian: Refactor handling of test suite environment
  
  Previously we would set the environment variables used to run the
  testsuite driver using `setEnv` to set them in the Hadrian process.
  While looking into failures of a fix to #25752 I noticed this and took
  the opportunity to refactor.
  

• 7ca72844
  by Alan Zimmerman at 2025-03-04T09:13:34-05:00

  [EPA] Sync with the ghc-exactprint repo
  
  This brings it into line with the changes in
  https://hackage.haskell.org/package/ghc-exactprint-1.12.0.0
  
  But also keeps the latest changes from master.
  

• 8f6cc90c
  by Matthew Pickering at 2025-03-05T04:48:02-05:00

  perf: Speed up the bytecode assembler
  
  This commit contains a number of optimisations to the bytecode
  assembler. In programs which generate a large amount of bytecode, the
  assembler is called a lot of times on many instructions.
  
  1. Specialise the assembleI function for the two intepreters to avoid
  having to materialise the intermediate free-monad like structure.
  2. Directly compute the UArray and SmallArray needed rather than going
     via the intermediate SizedSeq
  3. Use optimised monads
  4. Define unrolled "any" and "mapM6" functions which can be inlined
     and avoid calling recursive functions.
  
  The resulting generated code is much more direct.
  
  Before:
  
  ./ByteCodeAsm /home/matt/ghc-profiling-light/_build/stage1/lib/ +RTS  -s
    48,923,125,664 bytes allocated in the heap
       678,221,152 bytes copied during GC
           395,648 bytes maximum residency (2 sample(s))
            50,040 bytes maximum slop
                 6 MiB total memory in use (0 MiB lost due to fragmentation)
  
                                       Tot time (elapsed)  Avg pause  Max pause
    Gen  0     11731 colls,     0 par    0.419s   0.425s     0.0000s    0.0004s
    Gen  1         2 colls,     0 par    0.001s   0.001s     0.0007s    0.0012s
  
    INIT    time    0.000s  (  0.000s elapsed)
    MUT     time    6.466s  (  6.484s elapsed)
    GC      time    0.421s  (  0.426s elapsed)
    EXIT    time    0.000s  (  0.000s elapsed)
    Total   time    6.887s  (  6.910s elapsed)
  
  After:
  
     1,518,321,200 bytes allocated in the heap
         4,299,552 bytes copied during GC
           322,288 bytes maximum residency (2 sample(s))
            50,280 bytes maximum slop
                 6 MiB total memory in use (0 MiB lost due to fragmentation)
  
                                       Tot time (elapsed)  Avg pause  Max pause
    Gen  0       369 colls,     0 par    0.003s   0.003s     0.0000s    0.0002s
    Gen  1         2 colls,     0 par    0.001s   0.001s     0.0007s    0.0012s
  
    INIT    time    0.001s  (  0.001s elapsed)
    MUT     time    0.465s  (  0.466s elapsed)
    GC      time    0.004s  (  0.004s elapsed)
    EXIT    time    0.000s  (  0.000s elapsed)
    Total   time    0.470s  (  0.471s elapsed)
  

• f2d43e11
  by Teo Camarasu at 2025-03-05T04:48:40-05:00

  ghc-boot-th: expose all TH packages from proper GHC.Boot.* modules
  
  Previously we defined some modules here in the GHC.Internal namespace.
  Others were merely re-exposed from GHC.Internal.
  
  Re-exposed modules weren't handled correctly by Haddock, so the
  Haddocks for the `template-haskell` library couldn't see them.
  This change also makes the home package of these modules a bit clearer.
  
  Work towards #25705
  

• 91ef82df
  by Teo Camarasu at 2025-03-05T04:48:40-05:00

  ghc-boot-th: fix synopsis formatting
  
  `@...@` syntax doesn't seem to work in synposes and is just kept by
  Haddock verbatim.
  

• eb9fe1ec
  by Brandon Chinn at 2025-03-05T04:49:17-05:00

  Collapse string gaps as \& (#25784)
  
  In 9.10, "\65\ \0" would result in "A0", but in 9.12, it results in
  "\650", due to the string refactoring I did in !13128. Previously, we
  were resolving escape codes and collapsing string gaps as we come across
  them, but after the refactor, string processing is broken out into
  phases, which is both more readable and useful for multiline strings.
  

• 8037f487
  by Cheng Shao at 2025-03-05T04:49:54-05:00

  ghc-experimental: make JSVal abstract in GHC.Wasm.Prim
  
  This commit makes JSVal an abstract type in the export list of
  GHC.Wasm.Prim. JSVal's internal representation is supposed to be a non
  user facing implementation detail subject to change at any time. We
  should only expose things that are newtypes of JSVal, not JSVal
  itself.
  

• 4f342431
  by Cheng Shao at 2025-03-05T04:49:54-05:00

  wasm: make JSVal internal Weak# point to lifted JSVal
  
  JSVal has an internal Weak# with the unlifted JSVal# object as key to
  arrange its builtin finalization logic. The Weak# used to designate
  Unit_closure as a dummy value; now this commit designates the lifted
  JSVal closure as the Weak# value. This allows the implementation of
  mkWeakJSVal which can be used to observe the liveliness of a JSVal and
  attach a user-specified finalizer.
  

• 55af20e6
  by Cheng Shao at 2025-03-05T04:49:54-05:00

  ghc-experimental: add mkWeakJSVal
  
  This commit adds a mkWeakJSVal function that can be used to set up a
  Weak pointer with a JSVal key to observe the key's lifetime and
  optionally attach a finalizer.
  

• 8273d7d1
  by Matthew Pickering at 2025-03-05T04:50:30-05:00

  simplifier: Zap Id unfoldings before constructing InScopeSet in simpleOptExpr
  
  Care must be taken to remove unfoldings from `Var`s collected by exprFreeVars
  before using them to construct an in-scope set hence `zapIdUnfolding` in `init_subst`.
  Consider calling `simpleOptExpr` on an expression like
  
  ```
   case x of (a,b) -> (x,a)
  ```
  
  * One of those two occurrences of x has an unfolding (the one in (x,a), with
  unfolding x = (a,b)) and the other does not. (Inside a case GHC adds
  unfolding-info to the scrutinee's Id.)
  * But exprFreeVars just builds a set, so it's a bit random which occurrence is collected.
  * Then simpleOptExpr replaces each occurrence of x with the one in the in-scope set.
  * Bad bad bad: then the x in  case x of ... may be replaced with a version that has an unfolding.
  
  Fixes #25790
  

• 07fe6d1d
  by Rodrigo Mesquita at 2025-03-05T04:51:07-05:00

  docs: Fix ghci :doc documentation
  
  Fixes #25799
  

• a510b861
  by Matthew Pickering at 2025-03-06T11:43:23+00:00

  Add flag to control whether self-recompilation information is written to interface
  
  This patch adds the flag -fwrite-if-self-recomp which controls whether
  interface files contain the information necessary to answer the
  question:
  
    Do I need to recompile myself or is this current interface file
    suitable?
  
  Why? Most packages are only built once either by a distribution or cabal
  and then placed into an immutable store, after which we will never ask
  this question. Therefore we can derive two benefits from omitting this
  information.
  
  * Primary motivation: It vastly reduces the surface area for creating
    non-deterministic interface files. See issue #10424 which motivated a
    proper fix to that issue. Distributions have long contained versions
    of GHC which just have broken self-recompilation checking (in order to
    get deterministic interface files).
  
  * Secondary motivation: This reduces the size of interface files
    slightly.. the `mi_usages` field can be quite big but probably this
    isn't such a great benefit.
  
  * Third motivation: Conceptually clarity about which parts of an
    interface file are used in order to **communicate** with subsequent
    packages about the **interface** for a module. And which parts are
    used to self-communicate during recompilation checking.
  
  The main tracking issue is #22188 but fixes issues such as #10424 in a
  proper way.
  

• 5b05c27b
  by Matthew Pickering at 2025-03-06T11:43:23+00:00

  Disable self recomp in release flavour
  
  The interface files that we distribute should not contain any
  information which is used by the recompilation checking logic since
  source file will never be compiled again.
  
  I am not 100% sure this won't cause unexpected issues, there many be
  downstream consumers which are incorrectly using the information from
  interfaces, but this commit can be reverted if we detect issues.
  

• 1d4c9824
  by Matthew Craven at 2025-03-06T18:11:59-05:00

  Cmm: Add surface syntax for Word/Float bitcast ops
  

• 25c4a2a2
  by Matthew Craven at 2025-03-06T18:11:59-05:00

  Cmm: Add constant-folding for Word->Float bitcasts
  

• 30bdea67
  by Matthew Craven at 2025-03-06T18:11:59-05:00

  Add tests for #25771
  

• 44bf5fa1
  by Matthew Pickering at 2025-03-07T13:48:18+00:00

  iface: Store flags in interface files
  
  When reporting the reason why a module is recompiled (using
  `-dump-hi-diffs`), it is much more informative to inform the user about
  which flag exactly has changed, rather than just an opaque reference to
  a hash.
  
  Now, when the user enables `-fwrite-if-self-recomp-flags`
  there is a difference the precise part of the flags is
  reported:
  
  ```
  codegen flags changed:
  before: [Opt_NoTypeableBinds, Opt_OmitYields]
  after: [Opt_NoTypeableBinds, Opt_OmitYields, Opt_DictsStrict]
  ```
  
  Fixes #25571
  

• 324222bd
  by Oleg Grenrus at 2025-03-08T08:50:18-05:00

  Run fix-whitespace on compiler/
  
  https://hackage.haskell.org/package/fix-whitespace
  
  IMO this should be included into lint suite
  

• 1e53277a
  by sheaf at 2025-03-08T16:32:25-05:00

  Allow defaulting of representational equalities
  
  This commit generalises the defaulting of equality constraints that
  was introduced in 663daf8d (with follow-up in 6863503c) to allow
  the defaulting of *representational* equality constraints.
  
  Now we default a representational equality
  
    ty1 ~R# ty2
  
  by unifying ty1 ~# ty2.
  
  This allows the following defaulting to take place:
  
    - Coercible alpha[tau] Int ==> alpha := Int
    - Coercible (IO beta[tau]) (IO Char) ==> beta := Char
  
  See Note [Defaulting representational equalities] in GHC.Tc.Solver.Default
  for more details.
  
  Fixes #21003
  

• d6c40afc
  by Andreas Klebinger at 2025-03-08T16:33:02-05:00

  Revert "Use `Infinite` in unique generation, and clean up some other partial uni patterns as well."
  
  This reverts commit 643dd3d86968c527ba07ece9cc337728dbdfe2a0.
  
  As described in #25817 this commit introduced a subtle bug in AArch64
  code generation. So for the time being I will simply revert it
  wholesale.
  

• 68310e11
  by Andreas Klebinger at 2025-03-08T16:33:39-05:00

  Properly describe acceptance window for stat tests.
  
  The relative metric is already in %, so no need to multiply by 100.
  

• cca68421
  by Cheng Shao at 2025-03-08T22:04:42-05:00

  wasm: do not use wasm type reflection in dyld
  
  The wasm dynamic linker used to depend on v8's experimental wasm type
  reflection support to generate stub functions when treating GOT.func
  items that aren't exported by any loaded library yet. However, as we
  work towards wasm ghci browser mode (#25399), we need to ensure the
  wasm dyld logic is portable across browsers. So this commit removes
  the usage of wasm type reflection in wasm dyld, and it shall only be
  added many months later when this feature is widely available in
  browsers.
  

• 75fcc5c9
  by Cheng Shao at 2025-03-08T22:05:19-05:00

  wasm: don't create a wasm global for dyld poison
  
  There's a much more efficient way to convert an unsigned i32 to a
  signed one. Thanks, o3-mini-high.
  

• fd40eaa1
  by Cheng Shao at 2025-03-08T22:05:19-05:00

  wasm: revamp JSFFI internal implementation and documentation
  
  This patch revamps the wasm backend's JSFFI internal implementation
  and documentation:
  
  - `JSValManager` logic to allocate a key is simplified to simple
    bumping. According to experiments with all major browsers, the
    internal `Map` would overflow the heap much earlier before we really
    exhaust the 32-bit key space, so there's no point in the extra
    complexity.
  - `freeJSVal` is now idempotent and safe to call more than once. This
    is achieved by attaching the `StablePtr#` to the `JSVal#` closure
    and nullifying it when calling `freeJSVal`, so the same stable
    pointer cannot be double freed.
  - `mkWeakJSVal` no longer exposes the internal `Weak#` pointer and
    always creates a new `Weak#` on the fly. Otherwise by finalizing
    that `Weak#`, user could accidentally drop the `JSVal`, but
    `mkWeakJSVal` is only supposed to create a `Weak` that observes the
    `JSVal`'s liveliness without actually interfering it.
  - `PromisePendingException` is no longer exported since it's never
    meant to be caught by user code; it's a severe bug if it's actually
    raised at runtime.
  - Everything exported by user-facing `GHC.Wasm.Prim` now has proper
    haddock documentation.
  - Note [JSVal representation for wasm] has been updated to reflect the
    new JSVal# memory layout.
  

• cbae3708
  by Ben Gamari at 2025-03-11T06:09:58-04:00

  users guide: Fix typo

• 1951eb7a
  by Ben Gamari at 2025-03-11T06:10:35-04:00

  testsuite: Don't count fragile passes as failures in JUnit output
  
  As noted in #25806, the testsuite driver's JUnit output
  previously considered passes of fragile tests to be failures. Fix this.
  
  Closes #25806.

• 589f40b9
  by Matthew Pickering at 2025-03-11T06:11:11-04:00

  Use panic rather than error in expectJust
  
  Otherwise, we would not get a callstack printed out when the exception
  occurs.
  
  Fixes #25829
  

• d450e88e
  by sheaf at 2025-03-11T06:42:59-04:00

  Solve Wanted quantified constraints from Givens
  
  This commit ensures we directly solve Wanted quantified constraints from
  matching inert Given quantified constraints,instead of going through the
  trouble of emitting an implication constraint and processing that.
  
  This is not just an optimisation; it makes our lives easier when
  generating RULEs for specialisation.
  See Note [Solving Wanted QCs from Given QCs] for details
  
  Fixes #25758
  

• 48daaf53
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  testsuite: Add testcase for #25577
  

• d2ffb0ce
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  testsuite/ghc-api: Eliminate Makefile usage from various GHC API tests
  
  These tests can be expressed perfectly well using the testsuite driver
  itself.
  

• 2275b642
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  rts/linker/MachO: Assert that GOT relocations have GOT entries
  
  In #25577 we found that some GOT relocation types were not being given
  relocation entries. Add assertions to catch this sort of failure in the
  future.
  

• 8c96bcb4
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  rts/linker/MachO: Account for internal GOT references in GOT construction
  
  Previously we failed to give GOT slots to symbols which were referred to
  by GOT relocations in the same module. This lead to #25577.
  
  Fix this by explicitly traversing relocation lists and maintaining a
  `needs_got` flag for each symbol.
  
  Fixes #25577.
  

• 7b84c588
  by Vladislav Zavialov at 2025-03-11T06:43:02-04:00

  One list in ConPat (part of #25127)
  
  This patch changes PrefixCon to use one list instead of two:
  
  	-data HsConDetails tyarg arg rec
  	-  = PrefixCon [tyarg] [arg]
  	+data HsConDetails arg rec
  	+  = PrefixCon [arg]
  	   | RecCon    rec
  	   | InfixCon  arg arg
  
  The [tyarg] list is now gone. To understand the effect of this change,
  recall that there are three instantiations of HsConDetails:
  
  1. type HsConPatDetails p =
        HsConDetails (HsConPatTyArg (NoGhcTc p))  -- tyarg
                     (LPat p)                     -- arg
                     (HsRecFields p (LPat p))     -- rec
  
  2. type HsConDeclH98Details pass =
        HsConDetails Void                              -- tyarg
                     (HsScaled pass (LBangType pass))  -- arg
                     (XRec pass [LConDeclField pass])  -- rec
  
  3. type HsPatSynDetails pass =
        HsConDetails Void                     -- tyarg
                     (LIdP pass)              -- arg
                     [RecordPatSynField pass] -- rec
  
  In cases (2) and (3), tyarg was instantiated to Void, so the [tyarg]
  list was always empty. Its removal is basically a no-op.
  
  The interesting case is (1), which is used in ConPat to represent
  pattern matching of the form (MkE @tp1 @tp2 p1 p2).
  With this patch, its representation is changed as follows:
  
    ConPat "MkE" [tp1, tp2] [p1, p2]               -- old
    ConPat "MkE" [InvisP tp1, InvisP tp2, p1, p2]  -- new
  
  The new mixed-list representation is consintent with lambdas, where
  InvisP is already used to deal with \ @tp1 @tp2 p1 p2 -> body.
  
  The immediate effect of the new representation is an improvement to
  error messages. Consider the pattern (Con x @t y). Previously it
  resulted in a parse error because @t could not occur after x. Now it is
  reported as [GHC-14964]. Test case: TyAppPat_MisplacedApplication.
  
  In the long term, this is intended as preparation for #18389 and #25127,
  which would make (Con x @t y) potentially valid, e.g. if its type is
    Con :: forall a -> forall b. (a, b) -> T
  
  The TH AST is left unchanged for the moment to avoid breakage.
  

• cce869ea
  by Vladislav Zavialov at 2025-03-11T06:43:02-04:00

  Error message with EmptyCase and RequiredTypeArguments (#25004)
  
  Fix a panic triggered by a combination of \case{} and forall t ->
  
    ghci> let f :: forall (xs :: Type) -> (); f = \case {}
    panic! (the 'impossible' happened)
      GHC version 9.10.1:
            Util: only
  
  The new error message looks like this:
  
    ghci> let f :: forall (xs :: Type) -> (); f = \case {}
    <interactive>:5:41: error: [GHC-48010]
        • Empty list of alternatives in \case expression
          checked against a forall-type: forall xs -> ...
  
  This is achieved as follows:
  
  * A new data type, BadEmptyCaseReason, is now used to describe
    why an empty case has been rejected. Used in TcRnEmptyCase.
  
  * HsMatchContextRn is passed to tcMatches, so that the type checker
    can attach the syntactic context to the error message.
  
  * tcMatches now rejects type arguments if the list of alternatives is
    empty. This is what fixes the bug.
  

• 37d8b50b
  by sheaf at 2025-03-11T06:43:06-04:00

  user's guide: consolidate defaulting documentation
  
  This commit adds a new section on defaulting, which consolidates various
  parts of documentation surrounding defaulting into one central place.
  
  It explains type class defaulting in detail, extensions to it with
  OverloadedStrings, NamedDefaults and ExtendedDefaultRules, as well
  as other defaulting mechanisms (e.g. kind-based defaulting such as
  RuntimeRep defaulting, and defaulting of equalities).
  

• 0c9fd8d4
  by sheaf at 2025-03-11T06:43:06-04:00

  user's guide: flesh out XOverloadedStrings docs
  
  This commit extends the documentation of the OverloadedStrings extension
  with some usage information, in particular suggestions to:
  
    - use default declarations, such as `default (Text)` or
      `default IsString(Text)` (with the NamedDefaults extension),
  
    - enable the ExtendedDefaultRules extension to relax the requirement
      that a defaultable type variable must only appear in unary standard
      classes
  
  Fixes #23388
  

• 2df171d4
  by sheaf at 2025-03-11T06:43:06-04:00

  user's guide: NamedDefaults vs ExtendedDefaultRules
  
  This commit clarifies the defaulting rules with NamedDefaults,
  in particular in situations where a type variable appears in other
  constraints than standard/unary constraints.
  

• 77df05d0
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Take into account all flags when computing iface_hash
  
  The "interface hash" should contain a hash of everything in the
  interface file. We are not doing that yet but at least a start is to
  include a hash of everything in `mi_self_recomp`, rather than just
  `mi_src_hash` and `mi_usages`.
  
  In particular, this fixes #25837, a bug where we should recompile a
  `dyn_hi` file but fail to do so.
  

• 48b8f110
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Pass -fPIC to dynamicToo001 test to avoid platform dependence issues
  
  On darwin platforms, `-fPIC` is always enabled but on linux it is only
  enabled in the dynamic flavour. This can cause a difference in
  interface files (see #25836).
  
  The purpose of this test isn't to test module A recompilation, so we
  avoid this platform dependency by always passing `-fPIC`.
  

• 03c72f01
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Remove mi_used_th field from interface files
  
  In the distant past, recompilation checking was disabled for interfaces which used
  TemplateHaskell, but for several years now recompilation checking has
  been more fine-grained. This has rendered this field unused and
  lingering in an interface file.
  

• 6bb0e261
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Remove mi_hpc field from interface files
  
  The `mi_hpc` field is not used for anything as far as I can discern so
  there is no reason to record in the private interface of a module that
  there are modules in the transitive closure which use `hpc`.
  
  You can freely mix modules which use `-fhpc` and ones which don't.
  
  Whether to recompile a module due to `-fhpc` being passed to the module
  itself is determined in `fingerprintDynFlags`.
  

• b6d5b091
  by Simon Peyton Jones at 2025-03-11T22:39:23-04:00

  We can't UNPACK multi-constructor GADTs
  
  This MR fixes #25672
  
  See Note [Unpacking GADTs and existentials] in GHC.Types.Id.Make
  

• 8eae151d
  by Teo Camarasu at 2025-03-11T22:40:00-04:00

  template-haskell: Add explicit exports lists to all remaining modules
  

• db621b58
  by Teo Camarasu at 2025-03-11T22:40:00-04:00

  template-haskell: fix haddocks
  
  It seems that we need a direct dependency on ghc-internal, otherwise
  Haddock cannot find our haddocks
  
  The bug seems to be caused by Hadrian because if I rebuild with
  cabal-install (without this extra dependency) then I get accurate
  Haddocks.
  
  Resolves #25705
  

• 64ea68d9
  by Ben Gamari at 2025-03-12T07:11:51-04:00

  mk-ghcup-metadata: Clean up and add type annotations
  
  Getting this file right has historically been quite painful as it is a
  dynamically-typed script running only late in the release pipeline.
  

• b3f80b07
  by Ben Gamari at 2025-03-12T07:12:27-04:00

  rts: Drop imports of pthreads functions in cmm sources
  
  These are no longer used. I noticed these while looking for uses of
  __PIC__ in Cmm sources.
  

• 915a6781
  by Matthew Pickering at 2025-03-13T01:46:41-04:00

  interfaces: Ensure that forceModIface deeply forces a ModIface
  
  A ModIface is the result of compilation that we keep for a long time in
  memory. Therefore, it's very important to manage what we are going to
  retain and remove any external references to things which we might have
  captured compilation.
  
  If storing your ModIface in memory uses too much space, then store
  less things or make it use a more efficient representation.
  
  In the past there have been many space leak bugs by not sufficiently
  forcing a ModIface (#15111)
  
  This patch adds all the missing NFData instances for all the places I
  could find where we weren't deeply forcing the structure.
  

• 24d373a6
  by Matthew Craven at 2025-03-13T01:47:18-04:00

  Add interface-stability test for ghc-prim
  

• 0cb1db92
  by sheaf at 2025-03-14T13:11:44-04:00

  Don't report used duplicate record fields as unused
  
  This commit fixes the bug reported in #24035 in which the import of a
  duplicate record field could be erroneously reported as unused.
  
  The issue is that an import of the form "import M (fld)" can import
  several different 'Name's, and we should only report an error if ALL
  of those 'Name's are unused, not if ANY are.
  
  Note [Reporting unused imported duplicate record fields]
  in GHC.Rename.Names explains the solution to this problem.
  
  Fixes #24035
  

• f1830d74
  by Matthew Pickering at 2025-03-14T13:12:21-04:00

  binary: Directly copy ShortByteString to buffer rather than go via ByteString
  
  This avoids allocating an intermediate bytestring. I just noticed on a
  profile that `putFS` was allocating, and it seemed strange to me why
  since it should just copy the contents of the FastString into the
  already allocated buffer. It turned out we were going indirectly via a
  ByteString.
  
  Fixes #25861
  

• b15fca2b
  by Matthew Pickering at 2025-03-15T05:36:40-04:00

  iface: Store logical parts of ModIface together
  
  The ModIface structure is divided into several logical parts:
  
  1. mi_mod_info: Basic module metadata (name, version, etc.)
  
  2. mi_public: The public interface of the module (the ABI), which includes:
     - Exports, declarations, fixities, warnings, annotations
     - Class and type family instances
     - Rewrite rules and COMPLETE pragmas
     - Safe Haskell and package trust information
     - ABI hashes for recompilation checking
  
  4. mi_self_recomp: Information needed for self-recompilation checking
     (see Note [Self recompilation information in interface files])
  
  5. mi_simplified_core: Optional simplified Core for bytecode generation
     (only present when -fwrite-if-simplified-core is enabled)
  
  6. mi_docs: Optional documentation (only present when -haddock is enabled)
  
  7. mi_top_env: Information about the top-level environment of the original source
  
  8. mi_ext_fields: Additional fields for extensibility
  
  This structure helps organize the interface data according to its purpose and usage
  patterns. Different parts of the compiler use different fields. By separating them
  logically in the interface we can arrange to only deserialize the fields that are needed.
  
  This patch also enforces the invariant that the fields of ModIface are
  lazy. If you are keeping a ModIface on disk, then force it using
  `forceModIface`. Otherwise, when the `ModIface` is read from disk, only
  the parts which are needed from the interface will be deserialised.
  
  In a follow-up patch I will tackle follow-up issues:
  
  * Recompilation checking doesn't take into account exported named defaults (#25855)
  * Recompilation checking does not take into account COMPLETE pragmas (#25854)
  * mi_deps_ field in an interface is confused about whether the
    information is for self-recompilation checking or part of the ABI
    (#25844)
  
  Fixes #25845
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesDefsGhciWithCore
  -------------------------
  

• c758cb71
  by Ben Gamari at 2025-03-15T05:37:17-04:00

  configure: Fix incorrect SettingsLlvmAsFlags value
  
  Previously this was set to `LlvmAsCmd` rather than `LlvmAsFlags`,
  resulting in #25856.

• cfaaca14
  by sheaf at 2025-03-18T20:05:03-04:00

  Fix buglet in isEmptyWorkList
  
  There was a missing case in GHC.Tc.Solver.InertSet.isEmptyWorkList; it
  mistakenly ignored the 'wl_rw_eqs' field. This commit simply fixes that.
  No test case.
  

• 9f9fe0b3
  by sheaf at 2025-03-18T20:05:03-04:00

  Add mapMaybeTM method to TrieMap class
  
  This commit adds a new method to the TrieMap class, mapMaybeTM, and
  adds implementations to all the instances.
  
  mapMaybeTM is useful when filtering containers that contain other
  containers.
  

• 393531ff
  by Simon Peyton Jones at 2025-03-18T20:05:03-04:00

  Specialising expressions -- at last
  
  This MR addresses #24359, which implements the GHC proposal 493 on SPECIALISE pragmas.
  
  * The old code path (using SpecSig and SpecPrag) still exists.
  * The new code path (using SpecSigE and SpecPragE) runs alongside it.
  * All SPECIALISE pragmas are routed through the new code path, except
    if you give multiple type sigs, when the old code path is still used.
  * Main documentation: Note [Handling new-form SPECIALISE pragmas] in
    GHC.Tc.Gen.Sig`
  
  Thanks to @sheaf for helping with this MR.
  
  The Big Thing is to introduce
  
    {-# SPECIALISE forall x.  f @Int x True #-}
  
  where you can give type arguments and value argument to specialise; and
  you can quantify them with forall, just as in Rules.
  
  I thought it was going to be pretty simple, but it was a Long, Long Saga.
  
  Highlights
  
  * Overview Note [Handling new-form SPECIALISE pragmas] in GHC.Tc.Gen.Sig
    - New data constructor `SpecSigE` in data type `L.H.S.Binds.Sig`
    - New data construtor `SpecPragE` in data type `GHC.Hs.Binds.TcSpecPrag`
    - Renamer: uses `checkSpecESigShape` to decide which function to assocate the
               SPECIALISE pragma with
    - Some of the action is in `GHC.Tc.Gen.Sig.tcSpecPrag`
    - The rest is in `GHC.HsToCore.Binds.dsSpec`
  
  * We use a new TcS mode, TcSFullySolve, when simplifying the Wanteds
    that arise from the specialise expression. The mechanism is explained
    in Note [TcSFullySolve] in GHC.Tc.Solver.Monad. The reason why we need
    to do this is explained in Note [Fully solving constraints for specialisation]
    in GHC.Tc.Gen.Sig.
  
  * All of GHC.Tc.Gen.Rule is moved into GHC.Tc.Gen.Sig, because the code is
    very closely related.
  
  * The forall'd binders for SPECIALISE are the same as those for a RULE, so I
    refactored, introducing data type `L.H.S.Binds.RuleBndrs`, with functions
    to rename, zonk, typecheck it.  I refactored this data type a bit; nicer now.
  
  * On the LHS of RULES, or SPECIALISE, we want to disable the tricky mechanims
    described in Note [Desugaring non-canonical evidence] in GHC.HsToCore.Expr.
    Previously it wasn't fully disabled (just set to the empty set), and that
    didn't quite work in the new regime.
  
  * There are knock-on changes to Template Haskell.
  
  * For the LHS of a RULE and a SPECIALISE expression, I wanted to simplify
    it /without/ inlining the let-bindings for evidence variables.  I added
    a flag `so_inline` to the SimpleOpt optimiser to support this.  The
    entry point is `GHC.Core.SimpleOpt.simpleOptExprNoInline`
  
  * Since forever we have had a hack for type variables on the LHS of
    RULES. I took the opportunity to tidy this up.  The main action is
    in the zonker.  See GHC.Tc.Zonk.Type Note [Free tyvars on rule LHS],
    and especially data construtor `SkolemiseFlexi`
    in data type `GHC.Tc.Zonk.Env.ZonkFlexi`
  
  * Move `scopedSort` from GHC.Core.TyCo.FVs to GHC.Core.Predicate
    Reason: it now works for Ids as well, and I wanted to use isEvVar,
            which is defined in GHC.Core.Predicate
    Avoiding module loops meant that instead of exporting GHC.Core.TyCo.Tidy
    from GHC.Core.Type, modules now import the former directly.
  
    I also took the opportunity to remove unused exports
    from GHC.Core.Type.hs-boot
  
  * Flag stuff:
    - Add flag `-Wdeprecated-pragmas` and use it to control the warning when
      using old-style SPECIALISE pragmas with multiple type ascriptions,
  
    - Add flag `-Wuseless-specialisations` and use it to control the warning emitted
      when GHC determines that a SPECIALISE pragma would have no effect. Don't
      want if the SPECIALISE is SPECIALISE INLINE (#4444)
  
      In response to #25389, we continue to generate these seemingly code for these
      seemingly useless SPECIALISE pragmas
  
    - Adds deprecations to Template Haskell `pragSpecD` and `pracSpecInlD`,
  
  * Split up old-style SPECIALISE pragmas in GHC.Internal.Float,
    GHC.Internal.Numeric, GHC.Internal.Real
  
  * Remove useless SPECIALISE pragmas in Data.Array (updating the array submodule)
  
  Smaller things:
  
  - Update the Users Guide
  
  - Add mention of the changes to the 9.14 release notes as well as
    the Template Haskell changelog,
  

• 1884dd1a
  by Simon Peyton Jones at 2025-03-18T20:05:03-04:00

  Add -Wrule-lhs-equalities warning
  
  This commit adds a new warning, controlled by the warning flag,
  -Wrule-lhs-equalities, which is emitted when the LHS of a RULE gives
  rise to equality constraints that previous GHC versions would have
  quantified over.
  
  GHC instead discards such RULES, as GHC was never able to generate
  a rule template that would ever fire; it's better to be explicit about
  the fact that the RULE doesn't work.
  

• b00b3ef0
  by Ben Gamari at 2025-03-18T20:05:41-04:00

  compiler: Add export list to GHC.SysTools.Process
  
  This also revealed that `readProcessEnvWithExitCode` and its local
  helpers were dead code.
  

• 25850b22
  by ARATA Mizuki at 2025-03-18T20:06:25-04:00

  Fix code generation for SSE vector operations
  
  The new implementation generates correct code
  even if the registers overlap.
  
  Closes #25859
  

• e576468c
  by Andreas Klebinger at 2025-03-18T20:07:02-04:00

  Bump nofib submodule.
  
  Fixes #25867. (Ben-raytrace being broken by library changes)
  

• 443fc8b1
  by Sjoerd Visscher at 2025-03-19T12:01:04-04:00

  Multiplicity annotation on records
  
  Needing to store multiplicity annotations on records triggered a refactoring of AST of data declarations:
  
  Moved HsBangTy and HsRecTy from HsType to HsTypeGhcPsExt, the extension of HsType during parsing, since they are only needed during parsing.
  
  New HsConDeclField that stores all source data shared by all constructor declaration fields: unpackedness, strictness, multiplicity, documentation and the type of the field.
  
  Merged HsMultAnn and HsArrowOf, so all multiplicity annotations share the same data type.
  
  HsBang was no longer needed as a separate type, and was inlined into HsSrcBang.
  

• 313cf271
  by Ben Gamari at 2025-03-19T12:01:43-04:00

  gitlab-ci: Drop CentOS 7 binary distributions
  
  CentOS 7 is EoL and moreover we cannot even build images for it.
  
  See #25061.
  

• 5b94f99f
  by Ben Gamari at 2025-03-19T12:02:21-04:00

  rts: Ensure that WinIO flag is set when --io-manager=auto
  
  As noted in #25838, previously `selectIOManager` failed to set
  `rts_IOManagerIsWin32Native` in its `IO_MNGR_FLAG_AUTO`. This meant
  that the MIO path was taken when WinIO was supposedly selected,
  resulting in chaos.
  
  Fixes #25838.
  

• 1a3f1131
  by Peng Fan at 2025-03-19T12:03:10-04:00

  Pass the mcmodel=medium parameter to CC via GHC
  
  Ensure that GHC-driver builds default to mcmodel=medium, so that GHC
  passes this default parameter to CC without having to add it to the
  compiled project.
  
  Commit e70d41406b5d5638b42c4d8222cd03e76bbfeb86 does not ensure that all
  GHC-built object files have a default model of medium, and will raise an
  R_LARCH_B26 overflow error.
  

• 27cf7361
  by Matthew Craven at 2025-03-19T12:03:48-04:00

  Add interface-stability test for ghc-bignum
  
  As with ghc-prim, it makes sense to have some protection against
  accidental interface changes to this package caused by changes
  in ghc-internal.
  

• 25d46547
  by Matthew Craven at 2025-03-19T12:03:48-04:00

  Add README reference for the interface-stability tests
  

• 5d65393e
  by Simon Peyton Jones at 2025-03-20T05:41:24-04:00

  Remove the Core flattener
  
  This big MR entirely removes the "flattener" that took a type and
  replaced each type-family application with a fresh type variable.
  The flattener had its origin in the paper
       Injective type families for Haskell
  
  But (a) #25657 showed that flattening doesn't really work.
      (b) since we wrote the paper we have introduced the so-called
          "fine-grained" unifier GHC.Core.Unify, which can return
                   * SurelyApart
                   * Unifiable subst
                   * MaybeApart subst
          where the MaybeApart says that the two types are not unifiable by a
          substitution, but could (perhaps) be unified "later" after some type
          family reductions.  This turns out to subsume flattening.
  
  This MR does a major refactor of GHC.Core.Unify to make it capable of
  subsuming flattening.   The main payload is described in
         Note [Apartness and type families]
  and its many wrinkles.
  
  The key (non-refactoring) implementation change is to add `um_fam_env`
  to the `UMState` in the unification monad.
  
  Careful review with Richard revealed various bugs in the treament of
  `kco`, the kind coercion carried around by the unifier, so that is
  substantially fixed too: see Note [Kind coercions in Unify].
  
  Compile-time performance is improved by 0.1% with a few improvements over
  1% and one worsening by 1.3% namely T9872a.  (I have not investigated the
  latter.)
  
  Metric Decrease:
      T9872b
      T9872c
      TcPlugin_RewritePerf
  Metric Increase:
      T9872a
  

• 9003ef0a
  by sheaf at 2025-03-20T05:42:08-04:00

  Remove SDoc from UnknownSubordinate/MissingBinding
  
  This commit replaces unstructured SDoc arguments in error message constructors
  with uses of the following two datatypes:
  
    - SigLike: for different kinds of signatures (e.g. standalone kind signatures,
      fixity signatures, COMPLETE pragmas, etc)
    - Subordinate: for class methods, associated types, and record fields
  
  The following error message constructors now no longer have any SDocs in them:
  
    - TcRnIllegalBuiltinSyntax: SDoc -> SigLike
    - MissingBinding: SDoc -> SigLike
    - UnknownSubordinate: SDoc -> (Name, Subordinate)
    - SuggestMoveToDeclarationSite: SDoc -> SigLike
  

• 4329f3b6
  by sheaf at 2025-03-20T05:42:08-04:00

  Remove SDocs from HsDocContext
  
  This commit removes the remaining SDocs from the HsDocContext data type.
  It adds the following constructors:
  
    ClassInstanceCtx  -- Class instances
    ClassMethodSigCtx -- Class method signatures
    SpecialiseSigCtx  -- SPECIALISE pragmas
    PatSynSigCtx      -- Pattern synonym signatures
  
  We now report a bit more information for errors while renaming class instances,
  which slightly improves renamer-emitted error messages.
  

• 75c29aa1
  by sheaf at 2025-03-20T05:42:08-04:00

  Reject instance with non-class head in renamer
  
  This commit modifies rnClsInstDecl so that, when renaming, we reject a class
  instance declaration in which the head is not a class. Before this change, it
  would get rejected in the type-checker, but that meant that the renamer could
  emit unhelpful error messages, e.g.:
  
    data Foo m a
    instance Foo m where
      fmap _ x = case x of
  
  would rather unhelpfully say:
  
      ‘fmap’ is not a (visible) method of class ‘Foo’
  
  when of course 'Foo' is not even a class. We now reject the above program
  with the following error message:
  
      Illegal instance for data type ‘Foo’.
      Instance heads must be of the form
        C ty_1 ... ty_n
      where ‘C’ is a class.
  
  Fixes #22688
  

• a8f543a9
  by Cheng Shao at 2025-03-20T18:47:19-04:00

  testsuite: mark T7919 as fragile on i386 as well
  
  T7919 may also fail i386 CI jobs with test timeout.
  

• 256ac29c
  by sheaf at 2025-03-20T18:48:07-04:00

  Don't cache solved [W] HasCallStack constraints
  
  This commit ensures we do not add solved Wanted constraints that mention
  HasCallStack or HasExceptionContext constraints to the set of solved
  Wanted dictionary constraints: caching them is invalid, because re-using
  such cached dictionaries means using an old call-stack instead of
  constructing a new one, as was reported in #25529.
  
  Fixes #25529.
  

• 47646ce2
  by Andrew Lelechenko at 2025-03-20T18:48:43-04:00

  Improve haddock-visible documentation for GHC.Driver.Flags
  

• 2e4e15ed
  by Sylvain Henry at 2025-03-21T17:49:36-04:00

  Document -fnum-constant-folding (#25862)
  

• 044a6e08
  by sheaf at 2025-03-21T17:50:24-04:00

  LLVM: fix typo in padLiveArgs
  
  This commit fixes a serious bug in the padLiveArgs function, which
  was incorrectly computing too many padding registers. This caused
  segfaults, e.g. in the UnboxedTuples test.
  
  Fixes #25770
  Fixes #25773
  

• 1745c749
  by Teo Camarasu at 2025-03-22T18:42:37-04:00

  template-haskell: remove Language.Haskell.TH.Lib.Internal
  
  This module is purely used for the implementation of TH quote
  desugarring.
  
  Historically this needed to be exposed from `template-haskell`, since
  that's the package that the desugarred expressions referenced but since
  https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12479, this is no
  longer the case.
  
  Now these identifiers are in `ghc-internal`.
  
  Note that this module has carried the following warning for a long time:
  
  > This is not a part of the public API, and as such, there are no API guarantees for this
  module from version to version.
  
  Resolves #24766
  

• 3bc507db
  by Alan Zimmerman at 2025-03-22T18:43:13-04:00

  EPA: Fix exact printing of SPECIALISE pragma
  
  This commit fixes two minor issues with exactprinting of the
  SPECIALISE pragma after !12319 landed
  
  - The span for the RHS did not include the optional signature type
  - The `::` was printed twice when the legacy path was used
  
  Closes #25885
  

• bdf93da8
  by sheaf at 2025-03-24T11:25:12+01:00

  Renamer: improve handling of export children
  
  This commit refactors the 'childGREPriority' function which is used when
  renaming subordinate items in export lists and class declarations.
  
  Instead of having a complicated LookupChild parameter, we now simply pass the
  GREInfo of the parent, which allows us to decide what is a valid child:
  
    - classes can have children that are in the type constructor namespace,
    - promoted data constructors should be treated the same as normal data
      constructors.
  
  Fixes #24027
  

• 1dbc7846
  by Matthew Pickering at 2025-03-24T15:35:17-04:00

  Revert "mk-ghcup-metadata: Clean up and add type annotations"
  
  This reverts commit 64ea68d9a206ec4db5020b0a3fc563199ab18be3.
  
  See #25889
  

• 6941c825
  by doyougnu at 2025-03-25T10:05:58-04:00

  base: construct compat RTSFlags
  
  -- see CLC #289
  

• 730e6f77
  by doyougnu at 2025-03-25T10:06:02-04:00

  base: construct compat GHC.Stats
  
  -- see CLC #289
  

• cd9e6605
  by Ben Gamari at 2025-03-25T17:59:52-04:00

  rel_eng/upload: Clarify usage directions
  
  Previously it was not made clear that the directory name is significant.
  

• 7d18c19b
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  ghci: make the Pipe type opaque
  
  This commit makes the Pipe type in ghci opaque, and introduce the
  mkPipeFromHandles constructor for creating a Pipe from a pair of
  Handles. Pipe is now just a pair of receiver/sender continuations
  under the hood. This allows a Pipe to be potentially backed by other
  IPC mechanisms (e.g. WebSockets) which is essential for wasm ghci
  browser mode.
  

• a2103fd2
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  ghci: use improved Pipe logic for wasm iserv
  
  This commit makes wasm iserv take advantage of the Pipe refactoring by
  passing binary receiver/sender js callbacks from the dyld script. This
  paves the way for piping the binary messages through WebSockets in
  order to run wasm iserv in the browser, but more importantly, it
  allows us to get rid of a horrible hack in the dyld script: we no
  longer have to fake magical wasi file descriptors that are backed by
  nodejs blocking I/O! The legacy hack was due to these facts:
  
  - iserv only supported exchanging binary messages via handles backed
    by file descriptors
  - In wasi you can't access host file descriptors passed by host ghc
  - The nodejs wasi implementation only allows mapping host directories
    into the wasi vfs, not host file descriptors
  - Named pipes with file paths (mkfifo) doesn't work well with nodejs
    wasi implementation, causes spurious testsuite failures on macos
  
  But starting from this point, we can fully take advantage of
  non-blocking I/O on the js side.
  

• fa2fbd2b
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  ghci: fix ^C handling for wasm iserv
  
  This commit fixes ^C handling for wasm iserv. Previously we didn't
  handle it at all, so ^C would kill the node process and host ghc would
  then crash as well. But native ghc with external interpreter can
  handle ^C just fine and wasm should be no different. Hence the fix:
  wasm iserv exports its signal handler as a js callback to be handled
  by the dyld script. Also see added note for details.
  

• efcebed6
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: fix post-link.mjs for browser
  
  The wasm ghci browser mode needs to run dyld.mjs in the browser which
  imports post-link.mjs. This script makes post-link.mjs runnable in the
  browser by deferring node-specific module imports to their actual use
  sites.
  

• 27bb73c6
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: use console.assert in dyld script
  
  This commit uses console.assert() instead of node-specific strict
  assert in the dyld script, in order to make it runnable in the
  browser. console.assert() only warns and doesn't crash upon assertion
  failure, but this is fine; we can always trivially define a strict
  assert function shall it be necessary when debugging, and there hasn't
  been such an assertion failure seen in the wild for long enough.
  

• 929df0ba
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: asyncify the dylink.0 custom section parser
  
  This commit refactors the simple binary parser in the dyld script in
  charge of parsing the dylink.0 custom section. Previously the parser
  was synchronous and operated on the entire input buffer; this was
  simple and easy and worked well enough when the input wasm modules are
  instantly read from local filesystem.
  
  However, when running dyld in the browser, the wasm modules are
  transferred via fetch() requests. The host ghc and the browser might
  not be on the same machine, so slow network uplink does need to be
  considered. We only need to parse dylink.0 custom section to extract
  dependency info, and dylink.0 is the very first custom section in the
  wasm shared library binary payload, so the parsing process should not
  require fetch() to complete and should return the parsing result asap.
  
  Hence the refactorings in this commit: asyncify the parser, make it
  only consume as many bytes as needed by invoking an async consumer
  callback. The input is a readable stream from the fetch() response;
  once the response is available, the async wasm compilation can start
  in the background, and dylink.0 parsing shall end asap which results
  in more wasm shared libraries to be loaded earlier. Profit.
  

• 9a697181
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: fix dyld setImmediate usage in browser
  
  The wasm dyld script used to only run in node and directly uses
  setImmediate in globalThis. In case of browsers, it needs to import
  setImmediate from the prelude, hence this commit.
  

• d9b71e82
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: fix dyld downsweep filepath handling in browser
  
  The wasm dyld downsweep logic used to rely on nodejs path module to
  handle filepaths. That's not available in browsers, so this commit
  implements poor man's filepath handling in js, which is not elegant
  for sure but works for both nodejs and the browser.
  

• 7003a399
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: isolate nodejs-specific logic with the isNode flag in dyld
  
  As we move towards supporting running the dyld script in the browser,
  this commit implements the isNode module-level binding which is true
  if dyld is running in nodejs. The nodejs-specific bits are gated under
  isNode.
  
  For the browser case, this commit introduces @bjorn3/browser_wasi_shim
  as the wasi implementation; we already use it in quite a few projects
  and it simply works.
  

• 22ba2a78
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: isolate dyld side effects that might require IPC
  
  This commit spins out a DyLDHost class from DyLD that handles side
  effects that must be run in the same host environment that runs
  wasm32-wasi-ghc. When the dyld script runs in the browser, it'll need
  to do IPC to find libraries, fetch wasm library, etc, and the other
  side of dyld that runs on nodejs would simply expose the DyLDHost
  methods as endpoints for WebSockets/HTTP.
  

• e93fc33d
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: implement wasm ghci browser mode
  
  This commit implements the rest of dyld logic that delivers the ghci
  browser mode:
  
  - The dyld script can now fully run in the browser. It communicates
    back with dyld-on-nodejs via WebSockets and also plain HTTP 1.1
    requests.
  - The host dyld starts a server and acts as a broker between the GHC
    process and the browser side. GHC doesn't need to know anything
    about the browser mode; no driver flags need to be added and no
    recompilation needs to happen, the GHC driver continues to use the
    original iserv binary messages protocol.
  - The dyld broker doesn't need to parse any message between the
    browser dyld and GHC; it merely sets up WebSockets connections to
    redirect these messages as well as ^C signals.
  - Plain HTTP 1.1 is used for IPC requests (e.g. downloading a wasm
    module).
  - The dyld broker serves a main.js script that bootstraps iserv in the
    browser, and a main.html empty page playground for testing. CORS is
    enabled so it could be possible to inject iserv into other websites
    and use ghci to play with them.
  - All the RPC logic is opaque to the DyLD class, the majority of the
    wasm dynamic linker code is already portable and runs fine in
    firefox/chrome/webkit.
  
  Closes #25399.
  

• fc576798
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: add puppeteer/playwright support for ghci browser mode
  
  This commit adds support for using puppeteer/playwright for
  automatically launching a headless browser that backs the ghci browser
  mode. This is useful for testing the ghci browser mode as a part of
  GHC testsuite, and it's also convenient for local development since
  the step to start iserv can be automated away.
  

• ad7e271d
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: support wasi console redirect for the ghci browser mode
  
  This commit adds optional support for redirecting wasi console
  stdout/stderr back to the host when running wasm ghci browser mode. By
  default, the wasi console outputs are only available under F12
  devtools console, but in case of testing against a mobile browser, the
  devtools console may not be readily available, and it would be more
  convenient to at least get wasi console output on the host side.
  
  The redirection logic is simple, just adding another two WebSockets
  connections that pump the line-buffered textual messages back to
  host.
  

• 731217ce
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: add brotli compression for ghci browser mode
  
  This commit adds brotli compression for wasm shared libraries for ghci
  browser mode. With BROTLI_MIN_QUALITY, the overhead is negligible, and
  it helps reducing amount of transferred data when the browser connects
  to the server over a slow connection.
  

• ac70e643
  by Cheng Shao at 2025-03-26T13:37:19+00:00

  testsuite: add browser001 test for wasm ghci browser mode
  
  This commit adds support for testing the wasm ghci browser mode in the
  testsuite, as well as a simple first test case browser001 that makes
  use of TH, JSFFI and browser-specific DOM API. See added note and
  comments for details.
  

• 6ef5c0d2
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  docs: add wasm ghci subsection in user manual
  
  This commit updates the user manual to add wasm ghci subsection.
  

• 37381bcf
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  docs: update Note [The Wasm Dynamic Linker]
  
  This commit updates Note [The Wasm Dynamic Linker] to reflect recent
  developments, in particular the wasm ghci browser mode.
  

• 4b5a0f61
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  ci: bump DOCKER_REV and test wasm ghci browser mode
  
  This commit bumps the ci-images revision for updated wasm toolchain,
  and adds the launch options required to test wasm ghci browser mode.
  

• c6a3bc8f
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  driver: implement wasm ghci browser mode flags
  
  This commit implements GHC driver flags that enable the wasm ghci
  browser mode.
  

• f75e823e
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  rts: add hs_try_putmvar_with_value to RTS API
  
  This commit adds hs_try_putmvar_with_value to rts. It allows more
  flexibility than hs_try_putmvar by taking an additional value argument
  as a closure to be put into the MVar. This function is used & tested
  by the wasm backend runtime, though it makes sense to expose it as a
  public facing RTS API function as well.
  

• 9cd9f347
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  wasm: use MVar as JSFFI import blocking mechanism
  
  Previously, when blocking on a JSFFI import, we push a custom
  stg_jsffi_block stack frame and arrange the `promise.then` callback to
  write to that stack frame. It turns out we can simply use the good old
  MVar to implement the blocking logic, with a few benefits:
  
  - Less maintenance burden. We can drop the stg_jsffi_block related Cmm
    code without loss of functionality.
  - It interacts better with existing async exception mechanism. throwTo
    would properly block the caller if the target thread is masking
    async exceptions.
  

• da34f0aa
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  wasm: properly pin the raiseJSException closure
  
  We used to use keepAlive# to pin the raiseJSException closure when
  blocking on a JSFFI import thunk, since it can potentially be used by
  RTS. But raiseJSException may be used in other places as well (e.g.
  the promise.throwTo logic), and it's better to simply unconditionally
  pin it in the JSFFI initialization logic.
  

• dc904bfd
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  wasm: implement promise.throwTo() for async JSFFI exports
  
  This commit implements promise.throwTo() for wasm backend JSFFI
  exports. This allows the JavaScript side to interrupt Haskell
  computation by raising an async exception. See subsequent docs/test
  commits for more details.
  

• 7f80455e
  by Cheng Shao at 2025-03-26T18:01:55-04:00

  testsuite: add test for wasm promise.throwTo() logic
  
  This commit adds a test case to test the wasm backend
  promise.throwTo() logic.
  

• afdd3fe7
  by Cheng Shao at 2025-03-26T18:01:55-04:00

  docs: document the wasm backend promise.throwTo() feature
  

• 65dc65dc
  by sheaf at 2025-03-26T18:02:43-04:00

  Refactor CtEvidence into Given/Wanted
  
  This commit is a simple refactoring which splits up the CtEvidence,
  giving each constructor its own datatype:
  
    data CtEvidence
      = CtGiven  GivenCtEvidence
      | CtWanted WantedCtEvidence
  
    data GivenCtEvidence =
      GivenCt
        { ctev_pred :: TcPredType
        , ctev_evar :: EvVar
        , ctev_loc  :: CtLoc }
  
    data WantedCtEvidence =
      WantedCt
        { ctev_pred      :: TcPredType
        , ctev_dest      :: TcEvDest
        , ctev_loc       :: CtLoc
        , ctev_rewriters :: RewriterSet }
  
  This enables a few minor simplifications in the code, notably removing
  a panic from GHC.Tc.Solver.Solve.solveWantedForAll_implic.
  
  Fixes #25848
  

• ada04031
  by sheaf at 2025-03-26T18:03:27-04:00

  Export lists: same prio for NoParent & RightParent
  
  This commit ensures that, when we are renaming children in an export
  list item such as
  
    module M ( P(A,B,C) )
  
  we consider children with NoParent to have the same priority as children
  which have the correct parent (P in this case). This is because we
  should **not** prioritise a data constructor (with the right parent)
  over a pattern synonym we are bundling (which, before bundling, has
  no parent).
  
  Fixes #25892
  

• 721628a0
  by Adriaan Leijnse at 2025-03-27T09:10:10-04:00

  TTG: Replace HsUnboundVar with HsHole
  
  Context:
  
  The HsUnboundVar constructor in Language.Haskell.Syntax.Expr contained a
  RdrName, which stood in the way of the work towards a dedicated
  haskell-syntax library. The constructor was overloaded for unbound
  variables, anonymous and named holes, and parse errors.
  
  This commit:
  
  Replaces HsUnboundVar with HsHole. In the surface syntax HsHole only
  represents an anonymous expression hole ("_"). It is extended with the
  XHole type family.
  
  In the concrete GHC implementation of the language on the other hand,
  HsHole is used for "any thing which is not necessarily a valid or fully
  defined program fragment, but for which a type can be derived". This use
  is similar to how HsUnboundVar was used, but the parse error case is now
  made explicit with a ParseError case for XHole. This is in anticipation
  of future work on a fault tolerant compilation pipeline.
  

• dbd852f5
  by Ben Gamari at 2025-03-27T09:10:48-04:00

  rel_eng: Finish removal of CentOS jobs
  
  Remove centos7 from release fetch and ghcup metadata generation scripts.
  
  Closes #25893.
  

• 0e0231e7
  by Matthew Pickering at 2025-03-28T18:36:33-04:00

  hadrian: Make hash_unit_ids into a flavour transformer (and enable for release flavour)
  
  The primary reason for this change is to make the `release` flavour
  enable `--hash-unit-ids` by default without any further user intervention.
  
  * Packagers don't have to be aware of this special flag they should be
    using.
  * release builds on CI are uniformly testing with hashes (see !13418)
  
  Fixes #25379
  

• 9fc54c12
  by Rodrigo Mesquita at 2025-03-28T18:37:10-04:00

  driver: Move DynFlags consistency fixes off Main
  
  These consistency fixes found in Main.hs are required for the proper
  functioning of the compiler and should live together with all remaining
  fixes in `makeDynFlagsConsistent`.
  
  This is especially relevant to GHC applications that shouldn't have to
  copy/fix themselves possibly inconsistent DynFlags.
  
  Additionally, outputs information when verbosity is high about these
  consistency fixes that were previously quiet, adds information to the
  Note on consistency of DynFlags, and improves one of the fixes that
  incorrectly used `dynNow`.
  

• 2fdd0be9
  by sheaf at 2025-03-28T18:37:53-04:00

  Remove GhcHint from TcRnNotInScope constructor
  
  This is a tiny refactoring which:
  
    - removes GhcHint/ImportError fields from some constructors of
      TcRnMessage, using the TcRnMessageDetailed mechanism instead to
      report this informaiton:
        - removes the GhcHint and ImportErrors fields from TcRnNotInScope
        - removes the GhcHint field from TcRnTermNameInType
    - ensures that we only include these hints and import errors when the
      -fhelpful-errors flag is turned on
  
  Fixes #25874
  

• 9e5cd064
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  Better support for SSE3 and SSE4.1
  
  In particular:
  
  * Pass appropriate attributes to LLVM
  * Define preprocessor macros for them
  

• c2c7dd51
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  x86: Add support for SSSE3
  
  This commit adds the `-mssse3` flag, which controls usage of SSSE3 instructions in x86 code generation.
  

• d7c62580
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  x86 NCG SIMD: Implement 128-bit integer vector arithmetics
  
  This commit implements the following operations on integer vectors:
  
  * negateIntNXM#
  * plus{Int,Word}NXM#
  * minus{Int,Word}NXM#
  * times{Int,Word}NXM#
  * quot{Int,Word}NXM#
  * rem{Int,Word}NXM#
  * min{Int,Word}NXM#
  * max{Int,Word}NXM#
  
  where (N,M) is one of (8,16), (16,8), (32,4), or (64,2).
  
  Closes #25643
  

• f5ea4e7e
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  x86 NCG SIMD: Implement 128-bit integer vector shuffle
  
  This commit implements the following operations:
  
  * shuffle{Int,Word}8X16#
  * shuffle{Int,Word}16X8#
  * shuffle{Int,Word}32X4#
  * shuffle{Int,Word}64X2#
  
  See #25643
  

• 5eeb6645
  by Simon Peyton Jones at 2025-03-31T14:54:16-04:00

  Re-jig the way that the Simplifier tries RULES
  
  As #25170 showed, if a new RULE appears, it could change the simplifier's
  behaviour a bit, even if it never fires; and that messes up deterministic
  compilation.  (This was particularly nasty if the rule wasn't even transitively
  below the module being compiled.)
  
  This MR rejigs the use of `tryRules` so that behaviour does not change
  when a new, unrelated RULE is added.  It's described in
  
  * Note [When to apply rewrite rules]
  * Note [tryRules: plan (BEFORE)]
  * Note [tryRules: plan (AFTER)]
  
  The main change is in the refactored version of
    * simplOutId
    * rebuildCall
  The little state machine that was embedded in ArgInfo is gone.
  
  As I wandered around the Simplifier I also found opportunities for
  some loosely-related refactoring:
  
  * In several places, the /substitution/ in the SimpleEnv is empty;
    all we care about is the in-scope set and the flags.  So
    - I made a synonym `SimplEnvIS` that embodies that invariant,
    - used it in a number of type signatures (notably `rebuild`)
    - added some assertion checks (via `checkSimlEnvIS`)
  
  * I moved the hanlding of `runRW` out of `rebuildCall` (where we
    would have to test repeatedly) and into the new `simplOutId`, which
    fires up `rebuildCall`. Now it is only tested once.
  
  -------------------------
  Metric Decrease:
      T9020
      T9961
  -------------------------
  

• f534474a
  by sheaf at 2025-03-31T14:54:59-04:00

  Add comment: no qualified Names in the LocalRdrEnv
  
  This commit adds a reference to section 5.5.1 of the Haskell 2010 report,
  to explain that qualified names can't occur in the LocalRdrEnv.
  
  Fixes #25875
  

• d5ea80c6
  by Patrick at 2025-03-31T14:55:42-04:00

  Fix deadlock/loop in interface rehydration (#25858)
  
  In #25858, GHC hangs when processing modules with class defaults due to a
  circular dependency in the interface rehydration process. The deadlock/loop
  occurred when eager class defaults rehydration accessed not-yet-complete module details.
  
  To fix the immediate deadlock/loop.
  `tcIfaceDefaults` is refactored, we use the class name directly from the iface
  and use `forM` for lazy loading the class, which algins with the handling of other fields
  of ModDetails. This laziness ensure rehydration waits for HomePackageTable (HPT) to
  be updated and prevent premature evaluation of ModDetails inside `fixIO``.
  
  As suggested by Matthew, class defaults importing is also refactored
  to align with the compiler's established interface loading conventions.
  - add class defaults field to ExternalPackageState (EPS).
  - rehydrate and store class defaults in EPS at `loadInterface`.
  - Instead of using `tcIfaceDefaults` in `tcRnImports`, we add and use
    `tcGetClsDefaults` to read defaults directly from HPT or EPS
    when importing modules.
  
  Tests:
  - T25858, T25858v1-2: Test class hydration in defaults
  - T25858v3-4: Test type list hydration in defaults
  
  New Note [Tricky rehydrating IfaceDefaults loop] is added.
  
  Thanks to @sheaf (Sam), @mpickering (Matthew), and @simonpj (Simon) for their
  valuable input and analysis.
  
  Fixes #25858.
  

• 2d419d8d
  by Matthew Pickering at 2025-04-02T16:12:36-04:00

  Use unsafePerformIO in definition of computeFingerprint
  
  computeFingerprint is morally a pure function, which is implemented by
  mutating a buffer. Using unsafePerformIO inside the definition allows it
  to be used in pure contexts, fixing one place where an ad-hoc call to
  unsafePerformIO is already needed.
  

• ccdf979b
  by Matthew Pickering at 2025-04-02T16:12:37-04:00

  driver: Fix recompilation checking for exported defaults
  
  Since the exported defaults are not associated with any identifier from
  the module, they are just added to the export hash rather than
  the fine-grained recompilation logic.
  
  Fixes #25855
  

• c5bf9892
  by Matthew Pickering at 2025-04-02T16:12:37-04:00

  driver: Fix recompilation checking for COMPLETE pragmas
  
  A {-# COMPLETE P, Q #-} pragma is associated with the pattern synonyms P
  and Q during recompilation checking. Therefore, the existence of a
  pattern synonym becomes part of the ABI hash for P and Q.
  
  Then if a module uses these pattern synonyms and a complete pragma
  changes, it will trigger recompilation in that module.
  
  Fixes #25854
  

• d0fd9370
  by sheaf at 2025-04-02T16:14:05-04:00

  Handle named default exports separately
  
  This commit changes the way we check for duplicate exports of named
  default declarations. They are now treated entirely separately from
  other exports, because in an export list of the form
  
    module M ( default Cls, Cls )
  
  the default declaration does not export the class 'Cls', but only its
  default declarations.
  
  Also fixes a bug in Backpack where named default exports were getting
  dropped entirely. No test for that.
  
  Fixes #25857
  

• 62d04494
  by Cheng Shao at 2025-04-03T05:56:17-04:00

  ci: add x86_64-linux-ubuntu24_04 nightly/release jobs
  

• 327952e4
  by Cheng Shao at 2025-04-03T05:56:17-04:00

  rel-eng: add ubuntu24_04 bindists to ghcup metadata and fetch gitlab scripts
  

• aa1e3b8b
  by sheaf at 2025-04-03T05:57:24-04:00

  GHC settings: always unescape escaped spaces
  
  In #25204, it was noted that GHC didn't properly deal with having
  spaces in its executable path, as it would compute an invalid path
  for the C compiler.
  
  The original fix in 31bf85ee49fe2ca0b17eaee0774e395f017a9373 used a
  trick: escape spaces before splitting up flags into a list. This fixed
  the behaviour with extra flags (e.g. -I), but forgot to also unescape
  for non-flags, e.g. for an executable path (such as the C compiler).
  
  This commit rectifies this oversight by consistently unescaping the
  spaces that were introduced in order to split up argument lists.
  
  Fixes #25204
  

• 34a9b55d
  by lazyLambda at 2025-04-04T06:22:26-04:00

  Driver: make MonadComprehensions imply ParallelListComp
  
  This commit changes GHC.Driver.Flags.impliedXFlags to make the
  MonadComprehensions extension enable the ParallelListComp extension.
  
  Fixes #25645
  

• d99eb7cd
  by sheaf at 2025-04-04T06:23:28-04:00

  NamedDefaults: handle poly-kinded unary classes
  
  With this commit, we accept named default declarations for poly-kinded
  classes such as Typeable, e.g.
  
    default Typeable (Char)
  
  This used to fail because we assumed the kind of the class was monomorphic,
  e.g.
  
    Type -> Constraint
    (Type -> Type) -> Constraint
    Nat -> Constraint
  
  Now, we can handle a simple polymorphic class such as
  
    Typeable :: forall k. k -> Constraint
  
  Note that we keep the restriction that the class must only have
  one visible argument.
  
  This is all explained in the new Note [Instance check for default declarations]
  in GHC.Tc.Gen.Default.
  
  Fixes #25882
  

• 4cbc90de
  by sheaf at 2025-04-04T11:39:05-04:00

  LLVM: add type annotations to AtomicFetch_cmm.cmm
  

• e2237305
  by sheaf at 2025-04-04T11:39:05-04:00

  Cmm lint: lint argument types of CallishMachOps
  
  This commit adds a new check to Cmm lint to ensure that the argument
  types to a CallishMachOp are correct. The lack of this check was
  detected in the AtomicFetch test: the literals being passed as the
  second arguments to operations such as 'fetch_add', 'fetch_and'... were
  of the wrong width, which tripped up the LLVM backend.
  

• 9363e547
  by Cheng Shao at 2025-04-04T11:39:50-04:00

  ci: add ghc-wasm-meta integration testing jobs
  
  This patch adds ghc-wasm-meta integration testing jobs to the CI
  pipeline, which are only triggered via the `test-wasm` MR label or
  manually when the `wasm` label is set.
  
  These jobs will fetch the wasm bindists and test them against a
  variety of downstream projects, similarly to head.hackage jobs for
  native bindists, offering a convenient way to catch potential
  downstream breakage while refactoring the wasm backend.
  

• 27029e60
  by Adam Gundry at 2025-04-04T11:40:36-04:00

  base: Minor fixes to GHC.Records haddocks
  
  This corrects a stale reference to OverloadedRecordFields (which should
  be OverloadedRecordDot), fixes the haddock link syntax and adds an
  @since pragma.
  

• f827c4c6
  by Rodrigo Mesquita at 2025-04-07T11:22:10-04:00

  Parametrize default logger action with Handles
  
  Introduce `defaultLogActionWithHandles` to allow GHC applications to use
  GHC's formatting but using custom handles.
  
  `defaultLogAction` is then trivially reimplemented as
  ```
  defaultLogActionWithHandles stdout stderr
  ```
  

• 5dade5fd
  by sheaf at 2025-04-07T11:23:02-04:00

  Finer-grained recompilation checking for exports
  
  This commit refines the recompilation checking logic, to avoid
  recompiling modules with an explicit import list when the modules they
  import start exporting new items.
  
  More specifically, when:
  
    1. module N imports module M,
    2. M is changed, but in a way that:
        a. preserves the exports that N imports
        b. does not introduce anything that forces recompilation downstream,
           such as orphan instances
  
  then we no longer require recompilation of N.
  
  Note that there is more to (2a) as initially meets the eye:
  
    - if N includes a whole module or "import hiding" import of M,
      then we require that the export list of M does not change,
    - if N only includes explicit imports, we check that the imported
      items don't change, e.g.
  
        - if we have @import M(T(K, f), g)@, we must check that N
          continues to export all these identifiers, with the same Avail
          structure (i.e. we should error if N stops bundling K or f with
          T)
        - if we have @import M(T(..))@, we must check that the children
          of T have not changed
  
  See Note [When to recompile when export lists change?] in GHC.Iface.Recomp.
  
  This is all tested in the new tests RecompExports{1,2,3,4,5}
  
  Fixes #25881
  

• f32d6c2b
  by Andreas Klebinger at 2025-04-07T22:01:25-04:00

  NCG: AArch64 - Add -finter-module-far-jumps.
  
  When enabled the arm backend will assume jumps to targets outside of the
  current module are further than 128MB away.
  
  This will allow for code to work if:
  * The current module results in less than 128MB of code.
  * The whole program is loaded within a 4GB memory region.
  
  We have seen a few reports of broken linkers (#24648) where this flag might allow
  a program to compile/run successfully at a very small performance cost.
  
  -------------------------
  Metric Increase:
      T783
  -------------------------
  

• 553c280b
  by Andreas Klebinger at 2025-04-07T22:02:11-04:00

  Revert "rts: fix small argument passing on big-endian arch (fix #23387)"
  
  Based on analysis documented in #25791 this doesn't fully fix the big
  while introducing new bugs on little endian architectures.
  
  A more complete fix will have to be implemented to fix #23387
  
  This reverts commit 4f02d3c1a7b707e609bb3aea1dc6324fa19a5c39.
  

• b0dc6599
  by Andreas Klebinger at 2025-04-07T22:02:11-04:00

  Interpreter: Fixes to handling of subword value reads/writes.
  
  Load subword values as full words from the stack truncating/expanding as
  neccesary when dealing with subwords. This way byte order is implicitly
  correct.
  
  This commit also fixes the order in which we are pushing literals onto
  the stack on big endian archs.
  
  Last but not least we enable a test for ghci which actually tests these
  subword operations.
  

• ed38c09b
  by Cheng Shao at 2025-04-07T22:02:53-04:00

  testsuite: don't test WasmControlFlow stdout
  
  This patch solves a potential test flakiness in `WasmControlFlow` by
  removing `WasmControlFlow.stdout` which is not so portable/stable as
  it seems. See added `Note [WasmControlFlow]` for more detailed
  explanation.
  

• f807c590
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  debugger: Add docs to obtainTermFromId
  

• 5dba052d
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  Move logic to find and set Breakpoint to GHC
  
  Breakpoints are uniquely identified by a module and an index unique
  within that module. `ModBreaks` of a Module contains arrays mapping from
  this unique breakpoint index to information about each breakpoint. For
  instance, `modBreaks_locs` stores the `SrcSpan` for each breakpoint.
  
  To find a breakpoint using the line number you need to go through all
  breakpoints in the array for a given module and look at the line and
  column stored in the `SrcSpan`s. Similarly for columns and finding
  breakpoints by name.
  
  This logic previously lived within the `GHCi` application sources,
  however, it is common to any GHC applications wanting to set
  breakpoints, like the upcoming `ghc-debugger`.
  
  This commit moves this logic for finding and setting breakpoints to the
  GHC library so it can be used by both `ghci` and `ghc-debugger`.
  

• bc0b9f73
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  Refactor and move logic for identifier breakpoints
  
  Breakpoints can be set on functions using syntax of the form
  `[Module.]function`. The parsing, resolution (e.g. inferring implicit
  module), and validation of this syntax for referring to functions was
  tightly coupled with its GHCi use.
  
  This commit extracts the general purpose bits of resolving this syntax
  into `GHC.Runtime.Debugger.Breakpoints` so it can be further used by
  other GHC applications and to improve the code structure of GHCi.
  
  Moreover, a few utilities that do splitting and joining of identifiers
  as strings were moved to `GHC.Runtime.Eval.Utils`, which also can be
  used in the future to clean up `GHC.Runtime.Eval` a bit.
  

• 4f728d21
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  debugger: derive Ord for BreakpointIds
  

• 5528771c
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  debugger: Move context utils from GHCi to GHC
  
  Moves `enclosingTickSpan`, `getCurrentBreakSpan`, and
  `getCurrentBreakModule`, general utilities on the internal debugger
  state, into the GHC library.
  

• 4871f543
  by sheaf at 2025-04-08T17:42:43-04:00

  Implicit quantification in type synonyms: add test
  
  This adds a test for ticket #24090, which involves implicit
  quantification in type synonyms.
  The underlying issue was fixed in 0d4ee209dfe53e5074d786487f531dabc36d561c.
  

• 48917d3c
  by sheaf at 2025-04-08T17:42:44-04:00

  Turn on implicit-rhs-quantification by default
  
  This flag was added to GHC 9.8, and will be removed in a future GHC
  release. In preparation, this commit adds it to the default warning
  flags.
  

• 629be068
  by Rodrigo Mesquita at 2025-04-08T17:43:26-04:00

  debugger: Add breakpoints to every Stmt
  
  While single-stepping through a Haskell program we stop at every
  breakpoint. However, we don't introduce breakpoints at every single
  expression (e.g. single variables) because they would be too many and
  uninteresting.
  
  That said, in a do-block, it is expected that stepping over would break
  at every line, even if it isn't particularly interesting (e.g. a single
  arg like getArgs). Moreover, let-statements in do-blocks, despite only
  being evaluated once needed, lead to surprising jumps while stepping
  through because some have outermost (outside the let) breakpoints
  while others don't.
  
  This commit makes every statement in a do-block have a breakpoint.
  This leads to predictable stepping through in a do-block.
  Duplicate breakpoints in the same location are avoided using the
  existing blacklist mechanism, which was missing a check in one relevant place.
  
  Fixes #25932
  

• 99a3affd
  by Matthew Pickering at 2025-04-08T17:44:08-04:00

  driver: refactor: Split downsweep and MakeAction into separate modules.
  
  This will facilitate using the downsweep functions in other parts of
  the compiler than just --make mode.
  
  Also, the GHC.Driver.Make module was huge. Now it's still huge but
  slightly smaller!
  

• ecfec4df
  by sheaf at 2025-04-09T14:13:12-04:00

  Store user-written qualification in the GhcRn AST
  
  This commit ensures we store the original user-written module
  qualification in the renamed AST. This allows us to take into account
  the user-written qualification in error messages.
  
  Fixes #25877
  

• 97c884e2
  by sheaf at 2025-04-09T14:13:12-04:00

  TcRnIllegalTermLevelUse: simpler error when possible
  
  This commit makes GHC emit a simple error message in the case of an
  illegal term-level use of a data constructor: we will try to report an
  out-of-scope error instead of a "Illegal term level use" error, as the
  latter might be a bit overwhelming for newcomers.
  
  We do this when we have a data constructor import suggestion to provide
  to the user. For example:
  
    module M where { data A = A }
  
    module N where
      import M(A)
  
      x = Bool
      -- Illegal term-level use of Bool
  
      y = A
      -- Data constructor not in scope: A.
      -- Perhaps add 'A' to the import list of 'M'.
  
  This commit also revamps the "similar names" suggestion mechanism,
  and in particular its treatment of name spaces. Now, which name spaces
  we suggest is based solely on what we are looking for, and no longer on
  the NameSpace of the Name we have. This is because, for illegal term-level
  use errors, it doesn't make much sense to change the suggestions based
  on the fact that we resolved to e.g. a type constructor/class; what
  matters is what we were expecting to see in this position.
  See GHC.Rename.Unbound.{suggestionIsRelevant,relevantNameSpace} as well
  as the new constructors to GHC.Tc.Errors.Types.WhatLooking.
  
  Fixes #23982
  

• bff645ab
  by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00

  driver: Split Session functions out of Main
  
  This commit moves out functions that help in creating and validating a
  GHC multi session from Main into the ghc library where they can be used by
  other GHC applications.
  
  Moreover, `Mode` processing and `checkOptions` linting were moved to
  separate modules within the ghc-bin executable package.
  
  In particular:
  
  - Move `Mode` types and functions (referring to the mode GHC is running
    on) to `ghc-bin:GHC.Driver.Session.Mode`
  
  - Move `checkOptions` and aux functions, which validates GHC DynFlags
    based on the mode, to `ghc-bin:GHC.Driver.Session.Lint`
  
  - Moves `initMulti`, `initMake`, and aux functions, which initializes a make/multi-unit
    session, into `ghc:GHC.Driver.Session.Units`.
  

• 501b015e
  by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00

  docs: Improve haddock of ExecComplete
  

• dea98988
  by Andreas Klebinger at 2025-04-09T19:23:57-04:00

  Avoid oversaturing constructor workers.
  
  Constructor applications always need to take the exact number of
  arguments. If we can't ensure that instead apply the constructor worker
  like a regular function.
  
  Fixes #23865
  

• f1acdd2c
  by sheaf at 2025-04-09T19:25:41-04:00

  NamedDefaults: require the class to be standard
  
  We now only default type variables if they only appear in constraints
  of the form `C v`, where `C` is either a standard class or a class with
  an in-scope default declaration.
  
  This rectifies an oversight in the original implementation of the
  NamedDefault extensions that was remarked in #25775; that implementation
  allowed type variables to appear in unary constraints which had arbitrary
  classes at the head.
  
  See the rewritten Note [How type-class constraints are defaulted] for
  details of the implementation.
  
  Fixes #25775
  Fixes #25778
  

• 5712e0d6
  by Vladislav Zavialov at 2025-04-10T05:17:38+00:00

  Retry type/class declarations and instances (#12088)
  
  Retry type/class declarations and instances to account for non-lexical
  dependencies arising from type/data family instances.
  
  This patch improves the kind checker's ability to use type instances in kind
  checking of other declarations in the same module.
  
  * Key change: tcTyAndClassDecls now does multiple passes over the TyClGroups,
    as long as it is able to make progress.
    See the new Note [Retrying TyClGroups] in GHC.Tc.TyCl
  
  * Supporting change: FVs of a TyClGroup are now recorded in its extension
    field, namely XCTyClGroup.
    See the new Note [Prepare TyClGroup FVs] in GHC.Rename.Module
  
  * Instances are no longer inserted at the earliest positions where their FVs
    are bound. This is a simplification.
    See the new Note [Put instances at the end] in GHC.Rename.Module
  
  * Automatic unpacking is now more predictable, but fewer fields get unpacked
    by default. Use explicit {-# UNPACK #-} pragmas instead.
    See the new Note [Flaky -funbox-strict-fields with type/data families]
  
  For the wide range of newly accepted programs, consult the added test cases.
  
  Fixed tickets:
      #12088, #12239, #14668, #15561, #16410, #16448, #16693,
      #19611, #20875, #21172, #22257, #25238, #25834
  
  Metric Decrease:
      T8095
  

• bc73a78d
  by sheaf at 2025-04-10T15:07:24-04:00

  checkFamApp: don't be so eager to cycle break
  
  As remarked in #25933, a pure refactoring of checkTyEqRhs in
  ab77fc8c7adebd610aa0bd99d653f9a6cc78a374 inadvertently changed behaviour,
  as it caused GHC to introduce cycle-breaker variables in some
  unnecessary circumstances.
  
  This commit refactors 'GHC.Tc.Utils.Unify.checkFamApp' in a way that
  should restore the old behaviour, so that, when possible, we first
  recur into the arguments and only introduce a cycle breaker if this
  recursion fails (e.g. due to an occurs check failure).
  
  Fixes #25933
  

• 3acd8182
  by Andreas Klebinger at 2025-04-10T22:32:12-04:00

  Expand docs for RTS flag `-M`.
  
  The behaviour of how/when exceptions are raised was not really covered
  in the docs.
  

• 026c1a39
  by Adam Sandberg Ericsson at 2025-04-10T22:32:56-04:00

  add cases for more SchedulerStatus codes in rts_checkSchedStatus

• 5977c6a1
  by sheaf at 2025-04-10T22:33:46-04:00

  Squash warnings in GHC.Runtime.Heap.Inspect
  
  There were incomplete record selector warnings in GHC.Runtime.Heap.Inspect
  due to the use of the partial 'dataArgs' record selector. This is fixed
  by passing the fields to the 'extractSubTerms' function directly,
  rather than passing a value of the parent data type.
  

• 6a3e38f5
  by Andreas Klebinger at 2025-04-11T15:13:53-04:00

  hadrian: Make ghcWithInterpreter the universal source of truth about availability of the interpreter
  
  We were doing some ad-hoc checks in different places in hadrian to
  determine whether we supported the interprter or not. Now this check if
  confined to one function, `ghcWithInterpreter`, and all the places which
  use this information consult `ghcWithInterpreter` to determine what to
  do.
  
  Fixes #25533.
  

• 207de6f1
  by Matthew Pickering at 2025-04-11T15:14:37-04:00

  testsuite: Fix running TH tests with profiled dynamic compiler
  
  Previously, I had failed to update the ghc_th_way_flags logic for the
  profiled dynamic compiler.
  
  In addition to this `ghc_dynamic` was incorrectly set for profiled
  dynamic compiler.
  
  I also updated MultiLayerModulesTH_OneShot test to work for any compiler
  linkage rather than just dynamic.
  
  Fixes #25947
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_Make
  -------------------------
  

• 5455f2b9
  by Matthew Pickering at 2025-04-12T08:31:36-04:00

  driver: Add support for "Fixed" nodes in the ModuleGraph
  
  A fixed node in the module graph is one which we presume is already
  built. It's therefore up to the user to make sure that the interface
  file and any relevant artifacts are available for a fixed node.
  
  Fixed/Compile nodes are represented by the ModuleNodeInfo type, which
  abstracts the common parts of Fixed/Compile nodes with accessor
  functions of type `ModuleNodeInfo -> ...`.
  
  Fixed nodes can only depend on other fixed nodes. This invariant can be
  checked by the function `checkModuleGraph` or `mkModuleGraphChecked`.
  
  --make mode is modified to work with fixed mode. In order to "compile" a
  fixed node, the artifacts are just loaded into the HomePackageTable.
  Currently nothing in the compiler will produce Fixed nodes but this is
  tested with the FixedNodes GHC API test.
  
  In subsequent patches we are going to remove the ExternalModuleGraph and
  use Fixed nodes for modules in the module graph in oneshot mode.
  
  Fixes #25920
  

• ad64d5c2
  by Cheng Shao at 2025-04-12T08:32:19-04:00

  ci: remove manual case of ghc-wasm-meta downstream testing jobs
  
  This patch removes the manual case of ghc-wasm-meta downstream testing
  jobs; now the only way of including them in the pipeline and running
  them is via the test-wasm label.
  
  The reason of the removal is it proves to be problematic for MRs with
  only the wasm label; the wasm job would succeed, then the pipeline
  status would be waiting for manual action instead of succeeding. There
  needs to be separate jobs for the label-triggered and manual-triggered
  cases, but I don't think it's worth that extra complexity, the
  label-triggered case is already sufficient.
  

• b34890c7
  by Vladislav Zavialov at 2025-04-13T01:08:21+03:00

  Fix EmptyCase panic in tcMatches (#25960)
  
  Due to faulty reasoning in Note [Pattern types for EmptyCase],
  tcMatches was too keen to panic.
  
  * Old (incorrect) assumption: pat_tys is a singleton list.
    This does not hold when \case{} is checked against a function type
    preceded by invisible forall. See the new T25960 test case.
  
  * New (hopefully correct) assumption: vis_pat_tys is a singleton list.
    This should follow from:
  
      checkArgCounts :: MatchGroup GhcRn ... -> TcM VisArity
      checkArgCounts (MG { mg_alts = L _ [] })
        = return 1
      ...
  

• 84806ebc
  by Vladislav Zavialov at 2025-04-13T11:40:08-04:00

  Remove unused type: TokenLocation
  

• 05eb50df
  by Vladislav Zavialov at 2025-04-13T19:16:38-04:00

  Register EpToken in Parser.PostProcess.Haddock (#22558)
  
  This change allows us to reject more badly placed Haddock comments.
  Examples:
  
    module
      -- | Bad comment for the module
      T17544_kw where
  
    data Foo -- | Bad comment for MkFoo
      where MkFoo :: Foo
  
    newtype Bar -- | Bad comment for MkBar
      where MkBar :: () -> Bar
  
    class Cls a
        -- | Bad comment for clsmethod
      where
        clsmethod :: a
  

• 01944e5e
  by Vladislav Zavialov at 2025-04-13T19:17:21-04:00

  Reject puns in T2T (#24153)
  
  This patch implements pun detection in T2T. Consider:
  
    x = 42
    f, g :: forall a -> ...
    f (type x) = g x
  
  In accordance with the specification, the `g x` function call is renamed
  as a term, so `x` refers to the top-level binding `x = 42`, not to the
  type variable binding `type x` as one might expect.
  
  This is somewhat counterintuitive because `g` expects a type argument.
  Forbidding puns in T2T allows us to produce a helpful error message:
  
    Test.hs:5:16: error: [GHC-09591]
      Illegal punned variable occurrence in a required type argument.
      The name ‘x’ could refer to:
        ‘x’ defined at Test.hs:3:1
        ‘x’ bound at Test.hs:5:9
  
  This commit is a follow up to 0dfb1fa799af254c8a1e1045fc3996af2d57a613
  where checking for puns was left as future work.
  

• cc580552
  by Vladislav Zavialov at 2025-04-13T19:18:02-04:00

  Additional test cases for #12088, #13790
  
  Extract more test cases from ticket discussions, including multi-module
  examples. Follow up to 5712e0d646f611dfbfedfd7ef6dff3a18c016edb
  

• d47bf776
  by Matthew Pickering at 2025-04-14T16:44:41+01:00

  driver: Use ModuleGraph for oneshot and --make mode
  
  This patch uses the `hsc_mod_graph` field for both oneshot and --make
  mode. Therefore, if part of the compiler requires usage of the module
  graph, you do so in a uniform way for the two different modes.
  
  The `ModuleGraph` describes the relationship between the modules in the
  home package and units in external packages. The `ModuleGraph` can be
  queried when information about the transitive closure of a package is
  needed. For example, the primary use of the ModuleGraph from within the
  compiler is in the loader, which needs to know the transitive closure of
  a module so it can load all the relevant objects for evaluation.
  
  In --make mode, downsweep computes the ModuleGraph before any
  compilation starts.
  
  In oneshot mode, a thunk is created at the start of compilation, which
  when forced will compute the module graph beneath the current module.
  The thunk is only forced at the moment when the user uses Template
  Haskell.
  
  Finally, there are some situations where we need to discover what
  dependencies to load but haven't loaded a module graph at all. In this
  case, there is a fallback which computes the transitive closure on the
  fly and doesn't cache the result. Presumably if you are going to call
  getLinkDeps a lot, you would compute the right ModuleGraph before you
  started.
  
  Importantly, this removes the ExternalModuleGraph abstraction. This was quite
  awkward to work with since it stored information about the home package
  inside the EPS.
  
  This patch will also be very useful when implementing explicit level
  imports, which requires more significant use of the module graph in
  order to determine which level instances are available at.
  
  Towards #25795
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_Make
      MultiLayerModulesTH_OneShot
  -------------------------
  

• 395e0ad1
  by sheaf at 2025-04-16T12:33:26-04:00

  base: remove .Internal modules (e.g. GHC.TypeLits)
  
  This commit removes the following internal modules from base,
  as per CLC proposal 217:
  
    - GHC.TypeNats.Internal
    - GHC.TypeLits.Internal
    - GHC.ExecutionStack.Internal
  
  Fixes #25007
  

• e0f3ff11
  by Patrick at 2025-04-17T04:31:12-04:00

  Refactor Handling of Multiple Default Declarations
  
  Fixes: #25912, #25914, #25934
  
  Previously, GHC discarded all loaded defaults (tcg_default) when local
  defaults were encountered during typechecking. According to the
  exportable-named-default proposal (sections 2.4.2 and 2.4.3), local
  defaults should be merged into tcg_default, retaining any defaults
  already present while overriding where necessary.
  
  Key Changes:
  
  * Introduce DefaultProvenance to track the origin of default declarations
    (local, imported, or built-in), replacing the original cd_module
    in ClassDefaults with cd_provenance :: DefaultProvenance.
  * Rename tcDefaults to tcDefaultDecls, limiting its responsibility to only
    converting renamed class defaults into ClassDefaults.
  * Add extendDefaultEnvWithLocalDefaults to merge local defaults into the
    environment, with proper duplication checks:
    - Duplicate local defaults for a class trigger an error.
    - Local defaults override imported or built-in defaults.
  * Update and add related notes: Note [Builtin class defaults],
    Note [DefaultProvenance].
  * Add regression tests: T25912, T25914, T25934.
  
  Thanks sam and simon for the help on this patch.
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• 386f1854
  by Teo Camarasu at 2025-04-17T04:31:55-04:00

  template-haskell: Remove `addrToByteArrayName` and `addrToByteArray`
  
  These were part of the implementation of the `Lift ByteArray` instance and were errornously exported because this module lacked an explicit export list. They have no usages on Hackage.
  
  Resolves #24782
  

• b96e2f77
  by Sylvain Henry at 2025-04-18T20:46:33-04:00

  RTS: remove target info and fix host info (#24058)
  
  The RTS isn't a compiler, hence it doesn't have a target and we remove
  the reported target info displayed by "+RTS --info". We also fix the
  host info displayed by "+RTS --info": the host of the RTS is the
  RTS-building compiler's target, not the compiler's host (wrong when
  doing cross-compilation).
  

• 6d9965f4
  by Sylvain Henry at 2025-04-18T20:46:33-04:00

  RTS: remove build info
  
  As per the discussion in !13967, there is no reason to tag the RTS with
  information about the build platform.
  

• d52e9b3f
  by Vladislav Zavialov at 2025-04-18T20:47:15-04:00

  Diagnostics: remove the KindMismatch constructor (#25957)
  
  The KindMismatch constructor was only used as an intermediate
  representation in pretty-printing.
  
  Its removal addresses a problem detected by the "codes" test case:
  
    [GHC-89223] is untested (constructor = KindMismatch)
  
  In a concious deviation from the usual procedure, the error code
  GHC-89223 is removed entirely rather than marked as Outdated.
  The reason is that it never was user-facing in the first place.
  

• e2f2f9d0
  by Vladislav Zavialov at 2025-04-20T10:53:39-04:00

  Add name for -Wunusable-unpack-pragmas
  
  This warning had no name or flag and was triggered unconditionally.
  Now it is part of -Wdefault.
  
  In GHC.Tc.TyCl.tcTyClGroupsPass's strict mode, we now have to
  force-enable this warning to ensure that detection of flawed groups
  continues to work even if the user disables the warning with the
  -Wno-unusable-unpack-pragmas option. Test case: T3990c
  
  Also, the misnamed BackpackUnpackAbstractType is now called
  UnusableUnpackPragma.
  

• 6caa6508
  by Adam Gundry at 2025-04-20T10:54:22-04:00

  Fix specialisation of incoherent instances (fixes #25883)
  
  GHC normally assumes that class constraints are canonical, meaning that
  the specialiser is allowed to replace one dictionary argument with another
  provided that they have the same type.  The `-fno-specialise-incoherents`
  flag alters INCOHERENT instance definitions so that they will prevent
  specialisation in some cases, by inserting `nospec`.
  
  This commit fixes a bug in 7124e4ad76d98f1fc246ada4fd7bf64413ff2f2e, which
  treated some INCOHERENT instance matches as if `-fno-specialise-incoherents`
  was in effect, thereby unnecessarily preventing specialisation. In addition
  it updates the relevant `Note [Rules for instance lookup]` and adds a new
  `Note [Canonicity for incoherent matches]`.
  

• 0426fd6c
  by Adam Gundry at 2025-04-20T10:54:23-04:00

  Add regression test for #23429
  

• eec96527
  by Adam Gundry at 2025-04-20T10:54:23-04:00

  user's guide: update specification of overlapping/incoherent instances
  
  The description of the instance resolution algorithm in the user's
  guide was slightly out of date, because it mentioned in-scope given
  constraints only at the end, whereas the implementation checks for
  their presence before any of the other steps.
  
  This also adds a warning to the user's guide about the impact of
  incoherent instances on specialisation, and more clearly documents
  some of the other effects of `-XIncoherentInstances`.
  

• a00eeaec
  by Matthew Craven at 2025-04-20T10:55:03-04:00

  Fix bytecode generation for `tagToEnum# <LITERAL>`
  
  Fixes #25975.
  

• 2e204269
  by Andreas Klebinger at 2025-04-22T12:20:41+02:00

  Simplifier: Constant fold invald tagToEnum# calls to bottom expr.
  
  When applying tagToEnum# to a out-of-range value it's best to simply
  constant fold it to a bottom expression. That potentially allows more
  dead code elimination and makes debugging easier.
  
  Fixes #25976
  

• 7250fc0c
  by Matthew Pickering at 2025-04-22T16:24:04-04:00

  Move -fno-code note into Downsweep module
  
  This note was left behind when all the code which referred to it was
  moved into the GHC.Driver.Downsweep module
  

• d2dc89b4
  by Matthew Pickering at 2025-04-22T16:24:04-04:00

  Apply editing notes to Note [-fno-code mode] suggested by sheaf
  
  These notes were suggested in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14241
  

• 91564daf
  by Matthew Pickering at 2025-04-24T00:29:02-04:00

  ghci: Use loadInterfaceForModule rather than loadSrcInterface in mkTopLevEnv
  
  loadSrcInterface takes a user given `ModuleName` and resolves it to the
  module which needs to be loaded (taking into account module
  renaming/visibility etc).
  
  loadInterfaceForModule takes a specific module and loads it.
  
  The modules in `ImpDeclSpec` have already been resolved to the actual
  module to get the information from during renaming. Therefore we just
  need to fetch the precise interface from disk (and not attempt to rename
  it again).
  
  Fixes #25951
  

• 2e0c07ab
  by Simon Peyton Jones at 2025-04-24T00:29:43-04:00

  Test for #23298
  

• 0eef99b0
  by Sven Tennie at 2025-04-24T07:34:36-04:00

  RV64: Introduce J instruction (non-local jumps) and don't deallocate stack slots for J_TBL (#25738)
  
  J_TBL result in local jumps, there should not deallocate stack slots
  (see Note [extra spill slots].)
  
  J is for non-local jumps, these may need to deallocate stack slots.
  

• 1bd3d13e
  by fendor at 2025-04-24T07:35:17-04:00

  Add `UnitId` to `EvalBreakpoint`
  
  The `EvalBreakpoint` is used to communicate that a breakpoint was
  encountered during code evaluation.
  This `EvalBreakpoint` needs to be converted to an `InternalBreakpointId`
  which stores a `Module` to uniquely find the correct `Module` in the
  Home Package Table.
  
  The `EvalBreakpoint` used to store only a `ModuleName` which is then
  converted to a `Module` based on the currently active home unit.
  This is incorrect in the face of multiple home units, the break point
  could be in an entirely other home unit!
  To fix this, we additionally store the `UnitId` of the `Module` in
  `EvalBreakpoint` to later reconstruct the correct `Module`
  
  All of the changes are the consequence of extending `EvalBreakpoint`
  with the additional `ShortByteString` of the `UnitId`.
  
  For performance reasons, we store the `ShortByteString` backing the
  `UnitId` directly, avoiding marshalling overhead.
  

• fe6ed8d9
  by Sylvain Henry at 2025-04-24T18:04:12-04:00

  Doc: add doc for JS interruptible calling convention (#24444)
  

• 6111c5e4
  by Ben Gamari at 2025-04-24T18:04:53-04:00

  compiler: Ensure that Panic.Plain.assertPanic' provides callstack
  
  In 36cddd2ce1a3bc62ea8a1307d8bc6006d54109cf @alt-romes removed CallStack
  output from `GHC.Utils.Panic.Plain.assertPanic'`. While this output is
  redundant due to the exception backtrace proposal, we may be
  bootstrapping with a compiler which does not yet include this machinery.
  Reintroduce the output for now.
  
  Fixes #25898.
  

• 217caad1
  by Matthew Pickering at 2025-04-25T18:58:42+01:00

  Implement Explicit Level Imports for Template Haskell
  
  This commit introduces the `ExplicitLevelImports` and
  `ImplicitStagePersistence` language extensions as proposed in GHC
  Proposal #682.
  
  Key Features
  ------------
  
  - `ExplicitLevelImports` adds two new import modifiers - `splice` and
    `quote` - allowing precise control over the level at which imported
    identifiers are available
  - `ImplicitStagePersistence` (enabled by default) preserves existing
    path-based cross-stage persistence behavior
  - `NoImplicitStagePersistence` disables implicit cross-stage
    persistence, requiring explicit level imports
  
  Benefits
  --------
  
  - Improved compilation performance by reducing unnecessary code generation
  - Enhanced IDE experience with faster feedback in `-fno-code` mode
  - Better dependency tracking by distinguishing compile-time and runtime dependencies
  - Foundation for future cross-compilation improvements
  
  This implementation enables the separation of modules needed at
  compile-time from those needed at runtime, allowing for more efficient
  compilation pipelines and clearer code organization in projects using
  Template Haskell.
  
  Implementation Notes
  --------------------
  
  The level which a name is availble at is stored in the 'GRE', in the normal
  GlobalRdrEnv. The function `greLevels` returns the levels which a specific GRE
  is imported at. The level information for a 'Name' is computed by `getCurrentAndBindLevel`.
  The level validity is checked by `checkCrossLevelLifting`.
  
  Instances are checked by `checkWellLevelledDFun`, which computes the level an
  instance by calling `checkWellLevelledInstanceWhat`, which sees what is
  available at by looking at the module graph.
  
  Modifications to downsweep
  --------------------------
  
  Code generation is now only enabled for modules which are needed at
  compile time.
  See the Note [-fno-code mode] for more information.
  
  Uniform error messages for level errors
  ---------------------------------------
  
  All error messages to do with levels are now reported uniformly using
  the `TcRnBadlyStaged` constructor.
  
  Error messages are uniformly reported in terms of levels.
  
  0 - top-level
  1 - quote level
  -1 - splice level
  
  The only level hard-coded into the compiler is the top-level in
  GHC.Types.ThLevelIndex.topLevelIndex.
  
  Uniformly refer to levels and stages
  ------------------------------------
  
  There was much confusion about levels vs stages in the compiler.
  A level is a semantic concept, used by the typechecker to ensure a
  program can be evaluated in a well-staged manner.
  
  A stage is an operational construct, program evaluation proceeds in
  stages.
  
  Deprecate -Wbadly-staged-types
  ------------------------------
  
  `-Wbadly-staged-types` is deprecated in favour of `-Wbadly-levelled-types`.
  
  Lift derivation changed
  -----------------------
  
  Derived lift instances will now not generate code with expression
  quotations.
  
  Before:
  
  ```
  data A = A Int deriving Lift
  
  =>
  lift (A x) = [| A $(lift x) |]
  ```
  
  After:
  
  ```
  lift (A x) = conE 'A `appE` (lift x)
  ```
  
  This is because if you attempt to derive `Lift` in a module where
  `NoImplicitStagePersistence` is enabled, you would get an infinite loop
  where a constructor was attempted to be persisted using the instance you
  are currently defining.
  
  GHC API Changes
  ---------------
  
  The ModuleGraph now contains additional information about the type of
  the edges (normal, quote or splice) between modules. This is abstracted
  using the `ModuleGraphEdge` data type.
  
  Fixes #25828
  
  -------------------------
  Metric Increase:
      MultiLayerModulesTH_Make
  -------------------------
  

• 7641a74a
  by Simon Peyton Jones at 2025-04-26T22:05:19-04:00

  Get a decent MatchContext for pattern synonym bindings
  
  In particular when we have a pattern binding
      K p1 .. pn = rhs
  where K is a pattern synonym.  (It might be nested.)
  
  This small MR fixes #25995.  It's a tiny fix, to an error message,
  removing an always-dubious `unkSkol`.
  
  The bug report was in the context of horde-ad, a big program,
  and I didn't manage to make a small repro case quickly. I decided
  not to bother further.
  

• ce616f49
  by Simon Peyton Jones at 2025-04-27T21:10:25+01:00

  Fix infelicities in the Specialiser
  
  On the way to #23109 (unary classes) I discovered some infelicities
  (or maybe tiny bugs, I forget) in the type-class specialiser.
  
  I also tripped over #25965, an outright bug in the rule matcher
  
  Specifically:
  
  * Refactor: I enhanced `wantCallsFor`, whih previously always said
  `True`, to discard calls of class-ops, data constructors etc.  This is
  a bit more efficient; and it means we don't need to worry about
  filtering them out later.
  
  * Fix: I tidied up some tricky logic that eliminated redundant
    specialisations.  It wasn't working correctly.  See the expanded
    Note [Specialisations already covered], and
    (MP3) in Note [Specialising polymorphic dictionaries].
  
    See also the new top-level `alreadyCovered`
    function, which now goes via `GHC.Core.Rules.ruleLhsIsMoreSpecific`
  
    I also added a useful Note [The (CI-KEY) invariant]
  
  * Fix #25965: fixed a tricky bug in the `go_fam_fam` in
    `GHC.Core.Unify.uVarOrFam`, which allows matching to succeed
    without binding all type varibles.
  
    I enhanced Note [Apartness and type families] some more
  
  * #25703. This ticket "just works" with -fpolymorphic-specialisation;
    but I was surprised that it worked! In this MR I added documentation
    to Note [Interesting dictionary arguments] to explain; and tests to
    ensure it stays fixed.
  

• 22d11fa8
  by Simon Peyton Jones at 2025-04-28T18:05:19-04:00

  Track rewriter sets more accurately in constraint solving
  
  The key change, which fixed #25440, is to call `recordRewriter` in
  GHC.Tc.Solver.Rewrite.rewrite_exact_fam_app.  This missing call meant
  that we were secretly rewriting a Wanted with a Wanted, but not really
  noticing; and that led to a very bad error message, as you can see
  in the ticket.
  
  But of course that led me into rabbit hole of other refactoring around
  the RewriteSet code:
  
  * Improve Notes [Wanteds rewrite Wanteds]
  
  * Zonk the RewriterSet in `zonkCtEvidence` rather than only in GHC.Tc.Errors.
    This is tidier anyway (e.g. de-clutters debug output), and helps with the
    next point.
  
  * In GHC.Tc.Solver.Equality.inertsCanDischarge, don't replace a constraint
    with no rewriters with an equal constraint that has many. See
    See (CE4) in Note [Combining equalities]
  
  * Move zonkRewriterSet and friends from GHC.Tc.Zonk.Type into
    GHC.Tc.Zonk.TcType, where they properly belong.
  
  A handful of tests get better error messages.
  
  For some reason T24984 gets 12% less compiler allocation -- good
  
  Metric Decrease:
      T24984
  

• 6467d61e
  by Brandon Chinn at 2025-04-29T18:36:03-04:00

  Fix lexing "\^\" (#25937)
  
  This broke in the refactor in !13128, where the old code parsed escape
  codes and collapsed string gaps at the same time, but the new code
  collapsed gaps first, then resolved escape codes. The new code used a
  naive heuristic to skip escaped backslashes, but didn't account for
  "\^\".
  

• 99868a86
  by Jens Petersen at 2025-04-29T18:36:44-04:00

  hadrian: default selftest to disabled

• aba2a4a5
  by Zubin Duggal at 2025-04-30T06:35:59-04:00

  get-win32-tarballs.py: List tarball files to be downloaded if we cannot find them
  
  Fixes #25929
  

• d99a617b
  by Ben Gamari at 2025-04-30T06:36:40-04:00

  Move Data ModuleName instance to Language.Haskell.Syntax.Module.Name
  
  Fixes #25968.
  

• 9995c2b7
  by Serge S. Gulin at 2025-05-04T17:13:36+03:00

  Support for ARM64 Windows (LLVM-enabled) (fixes #24603)
  
  1. Add Windows AArch64 cross-compilation support via CI jobs
  Introduce new CI configurations for cross-compiling to Windows ARM64 using Debian12Wine, FEX, and MSYS2.
  Configure toolchain variables for LLVM MinGW and Wine emulation in CI pipelines.
  
  2. Adjust compiler and RTS for AArch64 Windows compatibility
  Reserve register `x18` on Windows and Darwin platforms in AArch64 codegen.
  Handle Windows-specific relocations and data sections in AArch64 assembler.
  Update PEi386 linker to recognize ARM64 binaries and support exception handling.
  Adjust LLVM target definitions and data layouts for new architectures.
  Update `ghc-toolchain` and build scripts to handle `TablesNextToCode` on Windows ARM64.
  
  3. Enhance CI scripts and stability
  Modify `ci.sh` to handle mingw cross-targets, fixing GHC executable paths and test execution.
  Use `diff -w` in tests to ignore whitespace differences, improving cross-platform consistency.
  
  4. Refactor and clean up code
  Remove redundant imports in hello.hs test.
  Improve error messages and checks for unsupported configurations in the driver.
  Add `EXDEV` error code to `errno.js`.
  Add async/sync flags to IO logs at `base.js`.
  Improve POSIX compatibility for file close at `base.js`: decrease indeterminism for mixed cases of async and sync code.
  
  5. Update dependencies: `Cabal`, `Win32`, `directory`, `process`, `haskeline`, and `unix`.
  
  submodule
  
  Co-authored-by: Cheng Shao <terrorjack@type.dance>
  Co-authored-by: Dmitrii Egorov <egorov.d.i@icloud.com>
  Co-authored-by: Andrei Borzenkov <root@sandwitch.dev>
  

• 50fa8165
  by Javran Cheng at 2025-05-05T05:55:39-04:00

  Suppress unused do-binding if discarded variable is Any or ZonkAny.
  
  Consider example (#25895):
  
  >  do { forever (return ()); blah }
  
  where `forever :: forall a b. IO a -> IO b`.
  
  Nothing constrains `b`, so it will be instantiates with `Any` or
  `ZonkAny`.
  But we certainly don't want to complain about a discarded do-binding.
  
  Fixes #25895
  

• e46c6b18
  by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00

  Refactor mkTopLevImportedEnv out of mkTopLevEnv
  
  This makes the code clearer and allows the top-level import context to
  be fetched directly from the HomeModInfo through the API (e.g. useful
  for the debugger).
  

• 0ce0d263
  by Rodrigo Mesquita at 2025-05-06T09:01:57-04:00

  Export sizeOccEnv from GHC.Types.Name.Occurrence
  
  Counts the number of OccNames in an OccEnv
  

• 165f98d8
  by Simon Peyton Jones at 2025-05-06T09:02:39-04:00

  Fix a bad untouchability bug im simplifyInfer
  
  This patch addresses #26004.  The root cause was that simplifyInfer
  was willing to unify variables "far out".  The fix, in
  runTcSWithEvBinds', is to initialise the inert set given-eq level with
  the current level. See
      (TGE6) in Note [Tracking Given equalities]
  in GHC.Tc.Solver.InertSet
  
  Two loosely related refactors:
  
  * Refactored approximateWCX to return just the free type
    variables of the un-quantified constraints.  That avoids duplication
    of work (these free vars are needed in simplifyInfer) and makes it
    clearer that the constraints themselves are irrelevant.
  
  * A little local refactor of TcSMode, which reduces the number of
    parameters to runTcSWithEvBinds
  

• 6e67fa08
  by Ben Gamari at 2025-05-08T06:21:21-04:00

  llvmGen: Fix built-in variable predicate
  
  Previously the predicate to identify LLVM builtin global variables was
  checking for `$llvm` rather than `@llvm` as it should.
  

• a9d0a22c
  by Ben Gamari at 2025-05-08T06:21:22-04:00

  llvmGen: Fix linkage of built-in arrays
  
  LLVM now insists that built-in arrays use Appending linkage, not
  Internal.
  
  Fixes #25769.
  

• 9c6d2b1b
  by sheaf at 2025-05-08T06:22:11-04:00

  Use mkTrAppChecked in ds_ev_typeable
  
  This change avoids violating the invariant of mkTrApp according to which
  the argument should not be a fully saturated function type.
  This ensures we don't return false negatives for type equality
  involving function types.
  
  Fixes #25998
  

• 75cadf81
  by Ryan Hendrickson at 2025-05-08T06:22:55-04:00

  haddock: Preserve indentation in multiline examples
  
  Intended for use with :{ :}, but doesn't look for those characters. Any
  consecutive lines with birdtracks will only have initial whitespace
  stripped up to the column of the first line.
  

• fee9b351
  by Cheng Shao at 2025-05-08T06:23:36-04:00

  ci: re-enable chrome for wasm ghci browser tests
  
  Currently only firefox is enabled for wasm ghci browser tests, for
  some reason testing with chrome works on my machine but gets stuck on
  gitlab instance runners. This patch re-enables testing with chrome by
  passing `--no-sandbox`, since chrome sandboxing doesn't work in
  containers without `--cap-add=SYS_ADMIN`.
  

• 282df905
  by Vladislav Zavialov at 2025-05-09T03:18:25-04:00

  Take subordinate 'type' specifiers into account
  
  This patch fixes multiple bugs (#22581, #25983, #25984, #25991)
  in name resolution of subordinate import lists.
  
  Bug #22581
  ----------
  In subordinate import lists, the use of the `type` namespace specifier
  used to be ignored. For example, this import statement was incorrectly
  accepted:
  
    import Prelude (Bool(type True))
  
  Now it results in an error message:
  
    <interactive>:2:17: error: [GHC-51433]
      In the import of ‘Prelude’:
        a data type called ‘Bool’ is exported,
        but its subordinate item ‘True’ is not in the type namespace.
  
  Bug #25983
  ----------
  In subordinate import lists within a `hiding` clause, non-existent
  items led to a poor warning message with -Wdodgy-imports. Consider:
  
    import Prelude hiding (Bool(X))
  
  The warning message for this import statement used to misreport the
  cause of the problem:
  
    <interactive>:3:24: warning: [GHC-56449] [-Wdodgy-imports]
      In the import of ‘Prelude’:
        an item called ‘Bool’ is exported, but it is a type.
  
  Now the warning message is correct:
  
    <interactive>:2:24: warning: [GHC-10237] [-Wdodgy-imports]
      In the import of ‘Prelude’:
        a data type called ‘Bool’ is exported, but it does not export
        any constructors or record fields called ‘X’.
  
  Bug #25984
  ----------
  In subordinate import lists within a `hiding` clause, non-existent
  items resulted in the entire import declaration being discarded.
  For example, this program was incorrectly accepted:
  
    import Prelude hiding (Bool(True,X))
    t = True
  
  Now it results in an error message:
  
    <interactive>:2:5: error: [GHC-88464]
      Data constructor not in scope: True
  
  Bug #25991
  ----------
  In subordinate import lists, it was not possible to refer to a class
  method if there was an associated type of the same name:
  
    module M_helper where
      class C a b where
        type a # b
        (#) :: a -> b -> ()
  
    module M where
      import M_helper (C((#)))
  
  This import declaration failed with:
  
    M.hs:2:28: error: [GHC-10237]
      In the import of ‘M_helper’:
        an item called ‘C’ is exported, but it does not export any children
        (constructors, class methods or field names) called ‘#’.
  
  Now it is accepted.
  
  Summary
  -------
  The changes required to fix these bugs are almost entirely confined to
  GHC.Rename.Names. Other than that, there is a new error constructor
  BadImportNonTypeSubordinates with error code [GHC-51433].
  
  Test cases:
    T22581a T22581b T22581c T22581d
    T25983a T25983b T25983c T25983d T25983e T25983f T25983g
    T25984a T25984b
    T25991a T25991b1 T25991b2
  

• 51b0ce8f
  by Simon Peyton Jones at 2025-05-09T03:19:07-04:00

  Slighty improve `dropMisleading`
  
  Fix #26105, by upgrading the (horrible, hacky) `dropMisleading`
  function.
  
  This fix makes things a bit better but does not cure the underlying
  problem.
  

• 7b2d1e6d
  by Simon Peyton Jones at 2025-05-11T03:24:47-04:00

  Refine `noGivenNewtypeReprEqs` to account for quantified constraints
  
  This little MR fixes #26020.  We are on the edge of completeness
  for newtype equalities (that doesn't change) but this MR makes GHC
  a bit more consistent -- and fixes the bug reported.
  

• eaa8093b
  by Cheng Shao at 2025-05-11T03:25:28-04:00

  wasm: mark freeJSVal as INLINE
  
  This patch marks `freeJSVal` as `INLINE` for the wasm backend. I
  noticed that the `freeJSVal` invocations are not inlined when
  inspecting STG/Cmm dumps of downstream libraries that use release
  build of the wasm backend. The performance benefit of inlining here is
  very modest, but so is the cost anyway; if you are using `freeJSVal`
  at all then you care about every potential chance to improve
  performance :)
  

• eac196df
  by Cheng Shao at 2025-05-11T03:25:28-04:00

  wasm: add zero length fast path for fromJSString
  
  This patch adds a zero length fast path for `fromJSString`; when
  marshaling a zero-length `JSString` we don't need to allocate an empty
  `ByteArray#` at all.
  

• 652cba7e
  by Peng Fan at 2025-05-14T04:24:35-04:00

  Add LoongArch NCG support
  
  Not supported before.
  

• c01f4374
  by Lin Runze at 2025-05-14T04:24:35-04:00

  ci: Add LoongArch64 cross-compile CI for testing
  

• ce6cf240
  by Ben Gamari at 2025-05-14T04:25:18-04:00

  rts/linker: Don't fail due to RTLD_NOW
  
  In !12264 we started using the NativeObj machinery introduced some time
  ago for loading of shared objects. One of the side-effects of this
  change is shared objects are now loaded eagerly (i.e. with `RTLD_NOW`).
  This is needed by NativeObj to ensure full visibility of the mappings of
  the loaded object, which is in turn needed for safe shared object
  unloading.
  
  Unfortunately, this change subtly regressed, causing compilation
  failures in some programs. Specifically, shared objects which refer to
  undefined symbols (e.g. which may be usually provided by either the
  executable image or libraries loaded via `dlopen`) will fail to load
  with eager binding. This is problematic as GHC loads all package
  dependencies while, e.g., evaluating TemplateHaskell splices. This
  results in compilation failures in programs depending upon (but not
  using at compile-time) packages with undefined symbol references.
  
  To mitigate this NativeObj now first attempts to load an object via
  eager binding, reverting to lazy binding (and disabling unloading) on
  failure.
  
  See Note [Don't fail due to RTLD_NOW].
  
  Fixes #25943.
  

• 88ee8bb5
  by Sylvain Henry at 2025-05-14T04:26:15-04:00

  Deprecate GHC.JS.Prim.Internal.Build (#23432)
  
  Deprecated as per CLC proposal 329 (https://github.com/haskell/core-libraries-committee/issues/329)
  

• b4ed465b
  by Cheng Shao at 2025-05-14T04:26:57-04:00

  libffi: update to 3.4.8
  
  Bumps libffi submodule.
  

• a3e71296
  by Matthew Pickering at 2025-05-14T04:27:38-04:00

  Remove leftover trace
  

• 2d0ecdc6
  by Cheng Shao at 2025-05-14T04:28:19-04:00

  Revert "ci: re-enable chrome for wasm ghci browser tests"
  
  This reverts commit fee9b351fa5a35d5778d1252789eacaaf5663ae8.
  Unfortunately the chrome test jobs may still timeout on certain
  runners (e.g. OpenCape) for unknown reasons.
  

• 3b3a5dec
  by Ben Gamari at 2025-05-15T16:10:01-04:00

  Don't emit unprintable characters when printing Uniques
  
  When faced with an unprintable tag we now instead print the codepoint
  number.
  
  Fixes #25989.
  
  (cherry picked from commit e832b1fadee66e8d6dd7b019368974756f8f8c46)
  

• e1ef8974
  by Mike Pilgrem at 2025-05-16T16:09:14-04:00

  Translate iff in Haddock documentation into everyday English
  

• fd64667d
  by Vladislav Zavialov at 2025-05-20T03:25:08-04:00

  Allow the 'data' keyword in import/export lists (#25899)
  
  This patch introduces the 'data' namespace specifier in import and
  export lists. The intended use is to import data constructors without
  their parent type constructors, e.g.
  
    import Data.Proxy as D (data Proxy)
    type DP = D.Proxy   -- promoted data constructor
  
  Additionally, it is possible to use 'data' to explicitly qualify any
  data constructors or terms, incl. operators and field selectors
  
    import Prelude (Semigroup(data (<>)))
    import Data.Function (data (&))
    import Data.Monoid (data Dual, data getDual)
  
    x = Dual "Hello" <> Dual "World" & getDual
  
  The implementation mostly builds on top of the existing logic for the
  'type' and 'pattern' namespace specifiers, plus there are a few tweaks
  to how we generate suggestions in error messages.
  

• acc86753
  by Ben Gamari at 2025-05-20T03:25:51-04:00

  compiler: Use field selectors when creating BCOs
  
  This makes it easier to grep for these fields.
  

• 60a55fd7
  by Ben Gamari at 2025-05-20T03:25:51-04:00

  compiler: Clarify BCO size
  
  Previously the semantics and size of StgBCO was a bit unclear.
  Specifically, the `size` field was documented to contain the size of the
  bitmap whereas it was actually the size of the closure *and* bitmap.
  Additionally, it was not as clear as it could be that the bitmap was a
  full StgLargeBitmap with its own `size` field.
  

• ac9fb269
  by Simon Peyton Jones at 2025-05-20T09:19:04-04:00

  Track rewriter sets more accurately in constraint solving
  
  This MR addresses #26003, by refactoring the arcane
  intricacies of Note [Equalities with incompatible kinds].
  NB: now retitled to
      Note [Equalities with heterogeneous kinds].
  and the main Note for this MR.
  
  In particular:
  
  * Abandon invariant (COERCION-HOLE) in Note [Unification preconditions] in
    GHC.Tc.Utils.Unify.
  
  * Abandon invariant (TyEq:CH)) in Note [Canonical equalities] in
    GHC.Tc.Types.Constraint.
  
  * Instead: add invariant (REWRITERS) to Note [Unification preconditions]:
    unify only if the constraint has an empty rewriter set.
  
  Implementation:
  
  * In canEqCanLHSFinish_try_unification, skip trying unification if there is a
    non-empty rewriter set.
  
  * To do this, make sure the rewriter set is zonked; do so in selectNextWorkItem,
    which also deals with prioritisation.
  
  * When a coercion hole is filled, kick out inert equalities that have that hole
    as a rewriter.  It might now be unlocked and available to unify.
  
  * Remove the ad-hoc `ch_hetero_kind` field of `CoercionHole`.
  
  * In `selectNextWorkItem`, priorities equalities withan empty rewriter set.
  
  * Defaulting: see (DE6) in Note [Defaulting equalities]
    and Note [Limited defaulting in the ambiguity check]
  
  * Concreteness checks: there is some extra faff to try to get decent
    error messages when the FRR (representation-polymorphism) checks
    fail. In partiular, add a "When unifying..." explanation when the
    representation-polymorphism check arose from another constraint.
  

• 86406f48
  by Cheng Shao at 2025-05-20T09:19:47-04:00

  rts: fix rts_clearMemory logic when sanity checks are enabled
  
  This commit fixes an RTS assertion failure when invoking
  rts_clearMemory with +RTS -DS. -DS implies -DZ which asserts that free
  blocks contain 0xaa as the designated garbage value. Also adds the
  sanity way to rts_clearMemory test to prevent future regression.
  Closes #26011.
  
  ChatGPT Codex automatically diagnosed the issue and proposed the
  initial patch in a single shot, given a GHC checkout and the following
  prompt:
  
  ---
  
  Someone is reporting the following error when attempting to use `rts_clearMemory` with the RTS option `-DS`:
  
  ```
  test.wasm: internal error: ASSERTION FAILED: file rts/sm/Storage.c, line 1216
  
      (GHC version 9.12.2.20250327 for wasm32_unknown_wasi)
      Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug
  ```
  
  What's the culprit? How do I look into this issue?
  
  ---
  
  I manually reviewed & revised the patch, tested and submitted it.
  

• 7147370b
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: do not allocate strings in bytecode assembler
  
  This patch refactors the compiler to avoid allocating iserv buffers
  for BCONPtrStr at assemble-time. Now BCONPtrStr ByteStrings are
  recorded as a part of CompiledByteCode, and actual allocation only
  happens at link-time. This refactoring is necessary for adding
  bytecode serialization functionality, as explained by the revised
  comments in this commit.
  

• a67db612
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: make bc_strs serializable
  
  This commit makes the bc_strs field in CompiledByteCode serializable;
  similar to previous commit, we preserve the ByteString directly and
  defer the actual allocation to link-time, as mentioned in updated
  comment.
  

• 5faf34ef
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: make bc_itbls serializable
  
  This commit makes bc_itbls in CompiledByteCode serializable. A
  dedicated ConInfoTable datatype has been added in ghci which is the
  recipe for dynamically making a datacon's info table, containing the
  payload of the MkConInfoTable iserv message.
  

• 2abaf8c1
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: remove FFIInfo bookkeeping in BCO
  
  This commit removes the bc_ffis field from CompiledByteCode
  completely, as well as all the related bookkeeping logic in
  GHC.StgToByteCode. bc_ffis is actually *unused* in the rest of GHC
  codebase! It is merely a list of FFIInfo, which is just a remote
  pointer of the libffi ffi_cif struct; once we allocate the ffi_cif
  struct and put its pointer in a CCALL instruction, we'll never free it
  anyway. So there is no point of bookkeeping.
  

• adb9e4d2
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: make FFIInfo serializable in BCO
  
  This commit makes all the FFIInfo needed in CCALL instructions
  serializable. Previously, when doing STG to BCO lowering, we would
  allocate a libffi ffi_cif struct and keep its remote pointer as
  FFIInfo; but actually we can just keep the type signature as FFIInfo
  and defer the actual allocation to link-time.
  

• 200f401b
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  ghci: remove redundant NewBreakModule message
  
  This commit removes the redundant NewBreakModule message from ghci: it
  just allocates two strings! This functionality can be implemented with
  existing MallocStrings in one iserv call.
  

• ddaadca6
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: make breakpoint module name and unit id serializable
  
  This commit makes breakpoint module name and unit id serializable, in
  BRK_FUN instructions as well as ModBreaks. We can simply keep the
  module name and unit ids, and defer the buffer allocation to link
  time.
  

• a0fde202
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: remove unused newModule
  
  This commit removes the now unused newModule function from GHC.
  

• 68c8f140
  by Cheng Shao at 2025-05-20T17:22:19-04:00

  compiler: add BCONPtrFS for interned top level string literals in BCO
  
  This commit adds BCONPtrFS as a BCO non-pointer literal kind, which
  has the same semantics of BCONPtrStr, except it contains a FastString
  instead of a ByteString. By using BCONPtrFS to represent top level
  string literals that are already FastString in the compilation
  pipeline, we enjoy the FastString interning logic and avoid allocating
  a bunch of redundant ByteStrings for the same FastStrings, especially
  when we lower the BRK_FUN instruction.
  

• f2b532bc
  by Peng Fan at 2025-05-20T17:23:15-04:00

  hadrian: enable GHCi for loongarch64
  

• 8ded2330
  by kwxm at 2025-05-20T17:24:07-04:00

  Fix bugs in `integerRecipMod` and `integerPowMod`
  
  This fixes #26017.
  
    * `integerRecipMod x 1` now returns `(# 1 | #)` for all x; previously it
      incorrectly returned `(# | () #)`, indicating failure.
  
    * `integerPowMod 0 e m` now returns `(# | () #)` for e<0 and m>1, indicating
      failure; previously it incorrectly returned `(# 0 | #)`.
  

• c9abb87c
  by Andreas Klebinger at 2025-05-20T17:24:50-04:00

  Specialise: Don't float out constraint components.
  
  It was fairly complex to do so and it doesn't seem to improve anything.
  Nofib allocations were unaffected as well.
  
  See also Historical Note [Floating dictionaries out of cases]
  

• 202b201c
  by Andreas Klebinger at 2025-05-21T10:16:14-04:00

  Interpreter: Add limited support for direct primop evaluation.
  
  This commit adds support for a number of primops directly
  to the interpreter. This avoids the indirection of going
  through the primop wrapper for those primops speeding interpretation
  of optimized code up massively.
  
  Code involving IntSet runs about 25% faster with optimized core and these
  changes. For core without breakpoints it's even more pronouced and I
  saw reductions in runtime by up to 50%.
  
  Running GHC itself in the interpreter was sped up by ~15% through this
  change.
  
  Additionally this comment does a few other related changes:
  
  testsuite:
  * Run foundation test in ghci and ghci-opt ways to test these
  primops.
  * Vastly expand the foundation test to cover all basic primops
    by comparing result with the result of calling the wrapper.
  
  Interpreter:
  * When pushing arguments for interpreted primops extend each argument to
    at least word with when pushing. This avoids some issues with big
    endian. We can revisit this if it causes performance issues.
  * Restructure the stack chunk check logic. There are now macros for
    read accesses which might cross stack chunk boundries and macros which
    omit the checks which are used when we statically know we access an
    address in the current stack chunk.
  

• 67a177b4
  by sheaf at 2025-05-21T10:17:04-04:00

  QuickLook: do a shape test before unifying
  
  This commit ensures we do a shape test before unifying. This ensures
  we don't try to unify a TyVarTv with a non-tyvar, e.g.
  
    alpha[tyv] := Int
  
  On the way, we refactor simpleUnifyCheck:
  
    1. Move the checkTopShape check into simpleUnifyCheck
    2. Refactors simpleUnifyCheck to return a value of the new type
       SimpleUnifyResult type. Now, simpleUnifyCheck returns "can unify",
       "cannot unify" or "dunno" (with "cannot unify" being the new result
       it can return). Now:
         - touchabilityTest is included; it it fails we return "cannot unify"
         - checkTopShape now returns "cannot unify" instead of "dunno" upon failure
    3. Move the call to simpleUnifyCheck out of checkTouchableTyVarEq.
       After that, checkTouchableTyVarEq becames a simple call to
       checkTyEqRhs, so we inline it.
  
  This allows the logic in canEqCanLHSFinish_try_unification to be simplified.
  In particular, we now avoid calling 'checkTopShape' twice.
  Two further changes suggested by Simon were also implemented:
  
    - In canEqCanLHSFinish, if checkTyEqRhs returns PuFail with
      'do_not_prevent_rewriting', we now **continue with this constraint**.
      This allows us to use the constraint for rewriting.
  
    - checkTyEqRhs now has a top-level check to avoid flattening a tyfam app
      in a top-level equality of the form alpha ~ F tys, as this is
      going around in circles. This simplifies the implementation without
      any change in behaviour.
  
  Fixes #25950
  Fixes #26030
  

• 4020972c
  by sheaf at 2025-05-21T10:17:04-04:00

  FixedRuntimeRepError: omit unhelpful explanation
  
  This commit tweaks the FixedRuntimeRepError case of pprTcSolverReportMsg,
  to avoid including an explanation which refers to a type variable that
  appears nowhere else.
  
  For example, the old error message could look like the following:
  
    The pattern binding does not have a fixed runtime representation.
    Its type is:
      T :: TYPE R
    Cannot unify ‘R’ with the type variable ‘c0’
    because the former is not a concrete ‘RuntimeRep’.
  
  With this commit, we now omit the last two lines, because the concrete
  type variable (here 'c0') does not appear in the type displayed to the
  user (here 'T :: TYPE R').
  

• 6d058a69
  by Andrea Bedini at 2025-05-21T16:00:51-04:00

  Don't fail when ghcversion.h can't be found (#26018)
  
  If ghcversion.h can't be found, don't try to include it. This happens
  when there is no rts package in the package db and when -ghcversion-file
  argument isn't passed.
  
  Co-authored-by: Syvlain Henry <sylvain@haskus.fr>
  

• b1212fbf
  by Vladislav Zavialov at 2025-05-21T16:01:33-04:00

  Implement -Wpattern-namespace-specifier (#25900)
  
  In accordance with GHC Proposal #581 "Namespace-specified imports",
  section 2.3 "Deprecate use of pattern in import/export lists", the
  `pattern` namespace specifier is now deprecated.
  
  Test cases: T25900 T25900_noext
  

• e650ec3e
  by Ben Gamari at 2025-05-23T03:42:46-04:00

  base: Forward port changelog language from 9.12
  

• 94cd9ca4
  by Ben Gamari at 2025-05-23T03:42:46-04:00

  base: Fix RestructuredText-isms in changelog
  

• 7722232c
  by Ben Gamari at 2025-05-23T03:42:46-04:00

  base: Note strictness changes made in 4.16.0.0
  
  Addresses #25886.
  

• 3f4b823c
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/linker: Factor out ProddableBlocks machinery
  

• 6e23fef2
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/linker: Improve efficiency of proddable blocks structure
  
  Previously the linker's "proddable blocks" check relied on a simple
  linked list of spans. This resulted in extremely poor complexity while
  linking objects with lots of small sections (e.g. objects built with
  split sections).
  
  Rework the mechanism to instead use a simple interval set implemented
  via binary search.
  
  Fixes #26009.
  

• ea74860c
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  testsuite: Add simple functional test for ProddableBlockSet
  

• 74c4db46
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/linker/PEi386: Drop check for LOAD_LIBRARY_SEARCH_*_DIRS
  
  The `LOAD_LIBRARY_SEARCH_USER_DIRS` and
  `LOAD_LIBRARY_SEARCH_DEFAULT_DIRS` were introduced in Windows Vista and
  have been available every since. As we no longer support Windows XP we
  can drop this check.
  
  Addresses #26009.
  

• 972d81d6
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/linker/PEi386: Clean up code style
  

• 8a1073a5
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/Hash: Factor out hashBuffer
  
  This is a useful helper which can be used for non-strings as well.
  

• 44f509f2
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/linker/PEi386: Fix incorrect use of break in nested for
  
  Previously the happy path of PEi386 used `break` in a double-`for` loop
  resulting in redundant calls to `LoadLibraryEx`.
  
  Fixes #26052.
  

• bfb12783
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts: Correctly mark const arguments
  

• 08469ff8
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/linker/PEi386: Don't repeatedly load DLLs
  
  Previously every DLL-imported symbol would result in a call to
  `LoadLibraryEx`. This ended up constituting over 40% of the runtime of
  `ghc --interactive -e 42` on Windows. Avoid this by maintaining a
  hash-set of loaded DLL names, skipping the call if we have already
  loaded the requested DLL.
  
  Addresses #26009.
  

• 823d1ccf
  by Ben Gamari at 2025-05-23T03:43:28-04:00

  rts/linker: Expand comment describing ProddableBlockSet
  

• e9de9e0b
  by Sylvain Henry at 2025-05-23T15:12:34-04:00

  Remove emptyModBreaks
  
  Remove emptyModBreaks and track the absence of ModBreaks with `Maybe
  ModBreaks`. It avoids testing for null pointers...
  

• 17db44c5
  by Ben Gamari at 2025-05-23T15:13:16-04:00

  base: Expose Backtraces constructor and fields
  
  This was specified in the proposal (CLC #199) yet somehow didn't make it
  into the implementation.
  
  Fixes #26049.
  

• b08c08ae
  by soulomoon at 2025-05-28T01:57:23+08:00

  Refactor handling of imported COMPLETE pragmas
  from the HPT
  
  Previously, we imported COMPLETE pragmas from all modules in the Home
  Package Table (HPT) during type checking. However, since !13675, there
  may be non-below modules in the HPT from the dependency tree that we do
  not want to import COMPLETE pragmas from. This refactor changes the way
  we handle COMPLETE pragmas from the HPT to only import them from modules
  that are "below" the current module in the HPT.
  
  - Add hugCompleteSigsBelow to filter COMPLETE pragmas from "below"
    modules in the HPT, mirroring hugRulesBelow.
  - Move responsibility for calling hugCompleteSigsBelow to tcRnImports,
    storing the result in the new tcg_complete_match_env field of TcGblEnv.
  - Update getCompleteMatchesTcM to use tcg_complete_match_env.
  
  This refactor only affects how COMPLETE pragmas are imported from the
  HPT, imports from external packages are unchanged.
  

• 16014bf8
  by Hécate Kleidukos at 2025-05-28T20:09:34-04:00

  Expose all of Backtraces' internals for ghc-internal
  
  Closes #26049
  

• a0adc30d
  by Ryan Hendrickson at 2025-05-30T14:12:52-04:00

  haddock: Fix links to type operators
  

• 7b64697c
  by Mario Blažević at 2025-05-30T14:13:41-04:00

  Introduce parenBreakableList and use it in ppHsContext
  

• 5f213bff
  by fendor at 2025-06-02T09:16:24+02:00

  Make GHCi commands compatible with multiple home units
  
  === Design
  
  We enable all GHCi features that were previously guarded by the `inMulti`
  option.
  
  GHCi supported multiple home units up to a certain degree for quite a while now.
  The supported feature set was limited, due to a design impasse:
  One of the home units must be "active", e.g., there must be one `HomeUnit`
  whose `UnitId` is "active" which is returned when calling
  
  ```haskell
  do
    hscActiveUnitId <$> getSession
  ```
  
  This makes sense in a GHC session, since you are always compiling a particular
  Module, but it makes less intuitive sense in an interactive session.
  Given an expression to evaluate, we can't easily tell in which "context" the expression
  should be parsed, typechecked and evaluated.
  That's why initially, most of GHCi features, except for `:reload`ing were disabled
  if the GHCi session had more than one `HomeUnitEnv`.
  
  We lift this restriction, enabling all features of GHCi for the multiple home unit case.
  To do this, we fundamentally change the `HomeUnitEnv` graph to be multiple home unit first.
  Instead of differentiating the case were we have a single home unit and multiple,
  we now always set up a multiple home unit session that scales seamlessly to an arbitrary
  amount of home units.
  
  We introduce two new `HomeUnitEnv`s that are always added to the `HomeUnitGraph`.
  They are:
  
  The "interactive-ghci", called the `interactiveGhciUnit`, contains the same
  `DynFlags` that are used by the `InteractiveContext` for interactive evaluation
  of expressions.
  This `HomeUnitEnv` is only used on the prompt of GHCi, so we may refer to it as
  "interactive-prompt" unit.
  See Note [Relation between the `InteractiveContext` and `interactiveGhciUnitId`]
  for discussing its role.
  
  And the "interactive-session"", called `interactiveSessionUnit` or
  `interactiveSessionUnitId`, which is used for loading Scripts into
  GHCi that are not `Target`s of any home unit, via `:load` or `:add`.
  
  Both of these "interactive" home units depend on all other `HomeUnitEnv`s that
  are passed as arguments on the cli.
  Additionally, the "interactive-ghci" unit depends on `interactive-session`.
  
  We always evaluate expressions in the context of the
  "interactive-ghci" session.
  Since "interactive-ghci" depends on all home units, we can import any `Module`
  from the other home units with ease.
  
  As we have a clear `HomeUnitGraph` hierarchy, we can set `interactiveGhciUnitId`
  as the active home unit for the full duration of the GHCi session.
  In GHCi, we always set `interactiveGhciUnitId` to be the currently active home unit.
  
  === Implementation Details
  
  Given this design idea, the implementation is relatively straight
  forward.
  The core insight is that a `ModuleName` is not sufficient to identify a
  `Module` in the `HomeUnitGraph`. Thus, large parts of the PR is simply
  about refactoring usages of `ModuleName` to prefer `Module`, which has a
  `Unit` attached and is unique over the `HomeUnitGraph`.
  
  Consequentially, most usages of `lookupHPT` are likely to be incorrect and have
  been replaced by `lookupHugByModule` which is keyed by a `Module`.
  
  In `GHCi/UI.hs`, we make sure there is only one location where we are
  actually translating `ModuleName` to a `Module`:
  
  * `lookupQualifiedModuleName`
  
  If a `ModuleName` is ambiguous, we detect this and report it to the
  user.
  
  To avoid repeated lookups of `ModuleName`s, we store the `Module` in the
  `InteractiveImport`, which additionally simplifies the interface
  loading.
  
  A subtle detail is that the `DynFlags` of the `InteractiveContext` are
  now stored both in the `HomeUnitGraph` and in the `InteractiveContext`.
  In UI.hs, there are multiple code paths where we are careful to update
  the `DynFlags` in both locations.
  Most importantly in `addToProgramDynFlags`.
  
  ---
  
  There is one metric increase in this commit:
  
  -------------------------
  Metric Increase:
      T4029
  -------------------------
  
  It is an increase from 14.4 MB to 16.1 MB (+11.8%) which sounds like a
  pretty big regression at first.
  However, we argue this increase is solely caused by using more data
  structures for managing multiple home units in the GHCi session.
  In particular, due to the design decision of using three home units, the
  base memory usage increases... but by how much?
  
  A big contributor is the `UnitState`, of which we have three now, which
  on its own 260 KB per instance. That makes an additional memory usage of
  520 KB, already explaining a third of the overall memory usage increase.
  Then we store more elements in the `HomeUnitGraph`, we have more
  `HomeUnitEnv` entries, etc...
  
  While we didn't chase down each byte, we looked at the memory usage over time
  for both `-hi` and `-hT` profiles and can say with confidence while the memory
  usage increased slightly, we did not introduce any space leak, as
  the graph looks almost identical as the memory usage graph of GHC HEAD.
  
  ---
  
  Adds testcases for GHCi multiple home units session
  
  * Test truly multiple home unit sessions, testing reload logic and code evaluation.
  * Test that GHCi commands such as `:all-types`, `:browse`, etc., work
  * Object code reloading for home modules
  * GHCi debugger multiple home units session
  

• de603d01
  by fendor at 2025-06-02T09:16:24+02:00

  Update "loading compiled code" GHCi documentation
  
  To use object code in GHCi, the module needs to be compiled for use in
  GHCi. To do that, users need to compile their modules with:
  
  * `-dynamic`
  * `-this-unit-id interactive-session`
  
  Otherwise, the interface files will not match.
  

• b255a8ca
  by Vladislav Zavialov at 2025-06-02T16:00:12-04:00

  docs: Fix code example for NoListTuplePuns
  
  Without the fix, the example produces an error:
  
    Test.hs:11:3: error: [GHC-45219]
        • Data constructor ‘Tuple’ returns type ‘Tuple2 a b’
            instead of an instance of its parent type ‘Tuple a’
        • In the definition of data constructor ‘Tuple’
          In the data type declaration for ‘Tuple’
  
  Fortunately, a one line change makes it compile.
  

• 6558467c
  by Ryan Hendrickson at 2025-06-06T05:46:58-04:00

  haddock: Parse math even after ordinary characters
  
  Fixes a bug where math sections were not recognized if preceded by a
  character that isn't special (like space or a markup character).
  

• 265d0024
  by ARATA Mizuki at 2025-06-06T05:47:48-04:00

  AArch64 NCG: Fix sub-word arithmetic right shift
  
  As noted in Note [Signed arithmetic on AArch64], we should zero-extend sub-word values.
  
  Fixes #26061
  

• 05e9be18
  by Simon Hengel at 2025-06-06T05:48:35-04:00

  Allow Unicode in "message" and "hints" with -fdiagnostics-as-json
  
  (fixes #26075)
  

• bfa6b70f
  by ARATA Mizuki at 2025-06-06T05:49:24-04:00

  x86 NCG: Fix code generation of bswap64 on i386
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  
  Fix #25601
  

• 35826d8b
  by Matthew Pickering at 2025-06-08T22:00:41+01:00

  Hadrian: Add option to generate .hie files for stage1 libraries
  
  The +hie_files flavour transformer can be enabled to produce hie files
  for stage1 libraries. The hie files are produced in the
  "extra-compilation-artifacts" folder and copied into the resulting
  bindist.
  
  At the moment the hie files are not produced for the release flavour,
  they add about 170M to the final bindist.
  
  Towards #16901
  

• e2467dbd
  by Ryan Hendrickson at 2025-06-09T13:07:05-04:00

  Fix various failures to -fprint-unicode-syntax
  

• 1d99d3e4
  by maralorn at 2025-06-12T03:47:39-04:00

  Add necessary flag for js linking
  

• 974d5734
  by maralorn at 2025-06-12T03:47:39-04:00

  Don’t use additional linker flags to detect presence of -fno-pie in configure.ac
  
  This mirrors the behavior of ghc-toolchain
  

• 1e9eb118
  by Andrew Lelechenko at 2025-06-12T03:48:21-04:00

  Add HasCallStack to Control.Monad.Fail.fail
  
  CLC proposal https://github.com/haskell/core-libraries-committee/issues/327
  
  2% compile-time allocations increase in T3064, likely because `fail`
  is now marginally more expensive to compile.
  
  Metric Increase:
      T3064
  

• 6d12060f
  by meooow25 at 2025-06-12T14:26:07-04:00

  Bump containers submodule to 0.8
  
  Also
  
  * Disable -Wunused-imports for containers
  * Allow containers-0.8 for in-tree packages
  * Bump some submodules so that they allow containers-0.8. These are not
    at any particular versions.
  * Remove unused deps containers and split from ucd2haskell
  * Fix tests affected by the new containers and hpc-bin
  

• 537bd233
  by Peng Fan at 2025-06-12T14:27:02-04:00

  NCG/LA64: Optimize code generation and reduce build-directory size.
  
  1. makeFarBranches: Prioritize fewer instruction sequences.
  2. Prefer instructions with immediate numbers to reduce register moves,
    e.g. andi,ori,xori,addi.
  3. Ppr: Remove unnecessary judgments.
  4. genJump: Avoid "ld+jr" as much as possible.
  5. BCOND and BCOND1: Implement conditional jumps with two jump ranges,
    with limited choice of the shortest.
  6. Implement FSQRT, CLT, CTZ.
  7. Remove unnecessary code.
  

• 19f20861
  by Simon Peyton Jones at 2025-06-13T09:51:11-04:00

  Improve redundant constraints for instance decls
  
  Addresses #25992, which showed that the default methods
  of an instance decl could make GHC fail to report redundant
  constraints.
  
  Figuring out how to do this led me to refactor the computation
  of redundant constraints.  See the entirely rewritten
  
     Note [Tracking redundant constraints]
  
  in GHC.Tc.Solver.Solve
  

• 1d02798e
  by Matthew Pickering at 2025-06-13T09:51:54-04:00

  Refactor the treatment of nested Template Haskell splices
  
  * The difference between a normal splice, a quasiquoter and implicit
  splice caused by lifting is stored in the AST after renaming.
  
  * Information that the renamer learns about splices is stored in the
  relevant splice extension points (XUntypedSpliceExpr, XQuasiQuote).
  
  * Normal splices and quasi quotes record the flavour of splice
    (exp/pat/dec etc)
  
  * Implicit lifting stores information about why the lift was attempted,
    so if it fails, that can be reported to the user.
  
  * After renaming, the decision taken to attempt to implicitly lift a
  variable is stored in the `XXUntypedSplice` extension field in the
  `HsImplicitLiftSplice` constructor.
  
  * Since all the information is stored in the AST, in `HsUntypedSplice`,
    the type of `PendingRnSplice` now just stores a `HsUntypedSplice`.
  
  * Error messages since the original program can be easily
    printed, this is noticeable in the case of implicit lifting.
  * The user-written syntax is directly type-checked. Before, some
    desugaring took place in the
  * Fixes .hie files to work better with nested splices (nested splices
    are not indexed)
  * The location of the quoter in a quasiquote is now located, so error
    messages will precisely point to it (and again, it is indexed by hie
    files)
  
  In the future, the typechecked AST should also retain information about
  the splices and the specific desugaring being left to the desugarer.
  
  Also, `runRnSplice` should call `tcUntypedSplice`, otherwise the
  typechecking logic is duplicated (see the `QQError` and `QQTopError`
  tests for a difference caused by this).
  

• f93798ba
  by Cheng Shao at 2025-06-13T09:52:35-04:00

  libffi: update to 3.5.1
  
  Bumps libffi submodule.
  

• c7aa0c10
  by Andreas Klebinger at 2025-06-15T05:47:24-04:00

  Revert "Specialise: Don't float out constraint components."
  
  This reverts commit c9abb87ccc0c91cd94f42b3e36270158398326ef.
  
  Turns out two benchmarks from #19747 regresses by a factor of 7-8x if
  we do not float those out.
  

• fd998679
  by Krzysztof Gogolewski at 2025-06-15T05:48:06-04:00

  Fix EPT enforcement when mixing unboxed tuples and non-tuples
  
  The code was assuming that an alternative cannot be returning a normal
  datacon and an unboxed tuple at the same time. However, as seen in #26107,
  this can happen when using a GADT to refine the representation type.
  
  The solution is just to conservatively return TagDunno.
  

• e64b3f16
  by ARATA Mizuki at 2025-06-17T10:13:42+09:00

  MachRegs.h: Don't define NO_ARG_REGS when a XMM register is defined
  
  On i386, MAX_REAL_VANILLA_REG is 1, but MAX_REAL_XMM_REG is 4.
  If we define NO_ARG_REGS on i386, programs that use SIMD vectors may segfault.
  
  Closes #25985
  
  A couple of notes on the BROKEN_TESTS field:
  
  * This fixes the segfault from T25062_V16.
  * The failure from T22187_run was fixed in an earlier commit (see #25561),
    but BROKEN_TESTS was missed at that time.  Now should be a good time to
    mark it fixed.
  

• 3e7c6b4d
  by Matthew Pickering at 2025-06-18T15:34:04-04:00

  Improve error messages when implicit lifting fails
  
  This patch concerns programs which automatically try to fix level errors
  by inserting `Lift`. For example:
  
  ```
  foo x = [| x |]
  ~>
  foo x = [| $(lift x) |]
  ```
  
  Before, there were two problems with the message.
  
  1. (#26031), the location of the error was reported as the whole
     quotation.
  2. (#26035), the message just mentions there is no Lift instance, but
     gives no indicate why the user program needed a Lift instance in the
     first place.
  
  This problem is especially bad when you disable
  `ImplicitStagePersistence`, so you just end up with a confusing "No
  instance for" message rather than an error message about levels
  
  This patch fixes both these issues.
  
  Firstly, `PendingRnSplice` differentiates between a user-written splice
  and an implicit lift. Then, the Lift instance is precisely requested
  with a specific origin in the typechecker. If the instance fails to be
  solved, the message is reported using the `TcRnBadlyLevelled`
  constructor (like a normal level error).
  
  Fixes #26031, #26035
  

• 44b8cee2
  by Cheng Shao at 2025-06-18T15:34:46-04:00

  testsuite: add T26120 marked as broken
  

• 894a04f3
  by Cheng Shao at 2025-06-18T15:34:46-04:00

  compiler: fix GHC.SysTools.Ar archive member size writing logic
  
  This patch fixes a long-standing bug in `GHC.SysTools.Ar` that emits
  the wrong archive member size in each archive header. It should encode
  the exact length of the member payload, excluding any padding byte,
  otherwise malformed archive that extracts a broken object with an
  extra trailing byte could be created.
  
  Apart from the in-tree `T26120` test, I've also created an out-of-tree
  testsuite at https://github.com/TerrorJack/ghc-ar-quickcheck that
  contains QuickCheck roundtrip tests for `GHC.SysTools.Ar`. With this
  fix, simple roundtrip tests and `writeGNUAr`/GNU `ar` roundtrip test
  passes. There might be more bugs lurking in here, but this patch is
  still a critical bugfix already.
  
  Fixes #26120 #22586.
  
  Co-authored-by: Codex <codex@openai.com>
  

• f677ab5f
  by Lauren Yim at 2025-06-18T15:35:37-04:00

  fix some typos in the warnings page in the user guide
  

• b968e1c1
  by Rodrigo Mesquita at 2025-06-18T15:36:18-04:00

  Add a frozen callstack to throwGhcException
  
  Fixes #25956
  

• a5e0c3a3
  by fendor at 2025-06-18T15:36:59-04:00

  Update using.rst to advertise full mhu support for GHCi
  

• d3e60e97
  by Ryan Scott at 2025-06-18T22:29:21-04:00

  Deprecate -Wdata-kinds-tc, make DataKinds issues in typechecker become errors
  
  !11314 introduced the `-Wdata-kinds-tc` warning as part of a fix for #22141.
  This was a temporary stopgap measure to allow users who were accidentally
  relying on code which needed the `DataKinds` extension in order to typecheck
  without having to explicitly enable the extension.
  
  Now that some amount of time has passed, this patch deprecates
  `-Wdata-kinds-tc` and upgrades any `DataKinds`-related issues in the
  typechecker (which were previously warnings) into errors.
  

• fd5b5177
  by Ryan Hendrickson at 2025-06-18T22:30:06-04:00

  haddock: Add redact-type-synonyms pragma
  
  `{-# OPTIONS_HADDOCK redact-type-synonyms #-}` pragma will hide the RHS
  of type synonyms, and display the result kind instead, if the RHS
  contains any unexported types.
  

• fbc0b92a
  by Vladislav Zavialov at 2025-06-22T04:25:16+03:00

  Visible forall in GADTs (#25127)
  
  Add support for visible dependent quantification `forall a -> t` in
  types of data constructors, e.g.
  
    data KindVal a where
      K :: forall k.
           forall (a::k) ->   -- now allowed!
           k ->
           KindVal a
  
  For details, see docs/users_guide/exts/required_type_arguments.rst,
  which has gained a new subsection.
  
  DataCon in compiler/GHC/Core/DataCon.hs
  ---------------------------------------
  The main change in this patch is that DataCon, the Core representation
  of a data constructor, now uses a different type to store user-written
  type variable binders:
  
    - dcUserTyVarBinders :: [InvisTVBinder]
    + dcUserTyVarBinders :: [TyVarBinder]
  
  where
  
    type TyVarBinder   = VarBndr TyVar ForAllTyFlag
    type InvisTVBinder = VarBndr TyVar Specificity
  
  and
  
    data Specificity  = InferredSpec | SpecifiedSpec
    data ForAllTyFlag = Invisible Specificity | Required
  
  This change necessitates some boring, mechanical changes scattered
  throughout the diff:
  
      ... is now used in place of ...
     -----------------+---------------
      TyVarBinder     | InvisTVBinder
      IfaceForAllBndr | IfaceForAllSpecBndr
      Specified       | SpecifiedSpec
      Inferred        | InferredSpec
      mkForAllTys     | mkInvisForAllTys
  
    additionally,
  
      tyVarSpecToBinders      -- added or removed calls
      ifaceForAllSpecToBndrs  -- removed calls
  
  Visibility casts in mkDataConRep
  --------------------------------
  Type abstractions in Core (/\a. e) always have type (forall a. t)
  because coreTyLamForAllTyFlag = Specified. This is also true of data
  constructor workers. So we may be faced with the following:
  
    data con worker:  (forall a.   blah)
    data con wrapper: (forall a -> blah)
  
  In this case the wrapper must use a visibility cast (e |> ForAllCo ...)
  with appropriately set fco_vis{L,R}. Relevant functions:
  
    mkDataConRep   in compiler/GHC/Types/Id/Make.hs
    dataConUserTyVarBindersNeedWrapper in compiler/GHC/Core/DataCon.hs
    mkForAllVisCos in compiler/GHC/Core/Coercion.hs
    mkCoreTyLams   in compiler/GHC/Core/Make.hs
    mkWpForAllCast in compiler/GHC/Tc/Types/Evidence.hs
  
  More specifically:
  
  - dataConUserTyVarBindersNeedWrapper has been updated to answer "yes"
    if there are visible foralls in the type of the data constructor.
  
  - mkDataConRep now uses mkCoreTyLams to generate the big lambda
    abstractions (/\a b c. e) in the data con wrapper.
  
  - mkCoreTyLams is a variant of mkCoreLams that applies visibility casts
    as needed. It similar in purpose to the pre-existing mkWpForAllCast,
    so the common bits have been factored out into mkForAllVisCos.
  
  ConDecl in compiler/Language/Haskell/Syntax/Decls.hs
  ----------------------------------------------------
  The surface syntax representation of a data constructor declaration is
  ConDecl. In accordance with the proposal, only GADT syntax is extended
  with support for visible forall, so we are interested in ConDeclGADT.
  
  ConDeclGADT's field con_bndrs has been renamed to con_outer_bndrs
  and is now accompanied by con_inner_bndrs:
  
    con_outer_bndrs :: XRec pass (HsOuterSigTyVarBndrs pass)
    con_inner_bndrs :: [HsForAllTelescope pass]
  
  Visible foralls always end up in con_inner_bndrs. The outer binders are
  stored and processed separately to support implicit quantification and
  the forall-or-nothing rule, a design established by HsSigType.
  
  A side effect of this change is that even in absence of visible foralls,
  GHC now permits multiple invisible foralls, e.g.
  
    data T a where { MkT :: forall a b. forall c d. ... -> T a }
  
  But of course, this is done in service of making at least some of these
  foralls visible. The entire compiler front-end has been updated to deal
  with con_inner_bndrs. See the following modified or added functions:
  
    Parser:
        mkGadtDecl     in compiler/GHC/Parser/PostProcess.hs
        splitLHsGadtTy in compiler/GHC/Hs/Type.hs
    Pretty-printer:
        pprConDecl           in compiler/GHC/Hs/Decls.hs
        pprHsForAllTelescope in compiler/GHC/Hs/Type.hs
    Renamer:
        rnConDecl                 in compiler/GHC/Rename/Module.hs
        bindHsForAllTelescopes    in compiler/GHC/Rename/HsType.hs
        extractHsForAllTelescopes in compiler/GHC/Rename/HsType.hs
    Type checker:
        tcConDecl           in compiler/GHC/Tc/TyCl.hs
        tcGadtConTyVarBndrs in compiler/GHC/Tc/Gen/HsType.hs
  
  Template Haskell
  ----------------
  The TH AST is left unchanged for the moment to avoid breakage. An
  attempt to quote or reify a data constructor declaration with visible
  forall in its type will result an error:
  
    data ThRejectionReason       -- in GHC/HsToCore/Errors/Types.hs
      = ...
      | ThDataConVisibleForall   -- new error constructor
  
  However, as noted in the previous section, GHC now permits multiple
  invisible foralls, and TH was updated accordingly. Updated code:
  
        repC         in compiler/GHC/HsToCore/Quote.hs
        reifyDataCon in compiler/GHC/Tc/Gen/Splice.hs
        ppr @Con     in libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
  
  Pattern matching
  ----------------
  Everything described above concerns data constructor declarations, but
  what about their use sites? Now it is trickier to type check a pattern
  match fn(Con a b c)=... because we can no longer assume that a,b,c are
  all value arguments. Indeed, some or all of them may very well turn out
  to be required type arguments.
  
  To that end, see the changes to:
  
        tcDataConPat   in compiler/GHC/Tc/Gen/Pat.hs
        splitConTyArgs in compiler/GHC/Tc/Gen/Pat.hs
  
  and the new helpers split_con_ty_args, zip_pats_bndrs.
  
  This is also the reason the TcRnTooManyTyArgsInConPattern error
  constructor has been removed. The new code emits TcRnArityMismatch
  or TcRnIllegalInvisibleTypePattern.
  
  Summary
  -------
  DataCon, ConDecl, as well as all related functions have been updated to
  support required type arguments in data constructors.
  
  Test cases:
    HieGadtConSigs   GadtConSigs_th_dump1   GadtConSigs_th_pprint1
    T25127_data      T25127_data_inst       T25127_infix
    T25127_newtype   T25127_fail_th_quote   T25127_fail_arity
    TyAppPat_Tricky
  
  Co-authored-by: mniip <mniip@mniip.com>
  

• ae003a3a
  by Teo Camarasu at 2025-06-23T05:21:48-04:00

  linters: lint-whitespace: bump upper-bound for containers
  
  The version of containers was bumped in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13989
  

• 0fb37893
  by Matthew Pickering at 2025-06-23T13:55:10-04:00

  Move ModuleGraph into UnitEnv
  
  The ModuleGraph is a piece of information associated with the
  ExternalPackageState and HomeUnitGraph. Therefore we should store it
  inside the HomeUnitEnv.
  

• 3bf6720e
  by soulomoon at 2025-06-23T13:55:52-04:00

  Remove hptAllFamInstances usage during upsweep
  
  Fixes #26118
  
  This change eliminates the use of hptAllFamInstances during the upsweep phase,
  as it could access non-below modules from the home package table.
  
  The following updates were made:
  
  * Updated checkFamInstConsistency to accept an explicit ModuleEnv FamInstEnv
    parameter and removed the call to hptAllFamInstances.
  * Adjusted hugInstancesBelow so we can construct ModuleEnv FamInstEnv
    from its result,
  * hptAllFamInstances and allFamInstances functions are removed.
  

• 83ee7b78
  by Ben Gamari at 2025-06-24T05:02:07-04:00

  configure: Don't force value of OTOOL, etc. if not present
  
  Previously if `otool` and `install_name_tool` were not present they
  would be overridden by `fp_settings.m4`. This logic was introduced in
  4ff93292243888545da452ea4d4c1987f2343591 without explanation.
  

• 9329c9e1
  by Ben Gamari at 2025-06-24T05:02:07-04:00

  ghc-toolchain: Add support for otool, install_name_tool
  
  Fixes part of ghc#23675.
  

• 25f5c998
  by Ben Gamari at 2025-06-24T05:02:08-04:00

  ghc-toolchain: Add support for llc, opt, llvm-as
  
  Fixes #23675.
  

• 51d150dd
  by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00

  hadrian: Use settings-use-distro-mingw directly
  
  The type `ToolchainSetting` only made sense when we had more settings to
  fetch from the system config file. Even then "settings-use-distro-mingw"
  is arguably not a toolchain setting.
  
  With the fix for #23675, all toolchain tools were moved to the
  `ghc-toolchain` `Toolchain` format. Therefore, we can inline
  `settings-use-distro-mingw` accesses and delete `ToolchainSetting`.
  

• dcf68a83
  by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00

  configure: Check LlvmTarget exists for LlvmAsFlags
  
  If LlvmTarget was empty, LlvmAsFlags would be just "--target=".
  If it is empty now, simply keep LlvmAsFlags empty.
  
  ghc-toolchain already does this right. This fix makes the two
  configurations match up.
  

• 580a3353
  by Ben Gamari at 2025-06-24T05:02:51-04:00

  rts/linker/LoadArchive: Use bool
  
  Improve type precision by using `bool` instead of `int` and `StgBool`.
  

• 76d1041d
  by Ben Gamari at 2025-06-24T05:02:51-04:00

  rts/linker/LoadArchive: Don't rely on file extensions for identification
  
  Previously archive members would be identified via their file extension,
  as described in #13103. We now instead use a more principled approach,
  relying on the magic number in the member's header.
  
  As well, we refactor treatment of archive format detection to improve
  code clarity and error handling.
  
  Closes #13103.
  

• 4b748a99
  by Teo Camarasu at 2025-06-24T15:31:07-04:00

  template-haskell: improve changelog
  
  
  stable -> more stable, just to clarify that this interface isn't fully stable.
  
  errornously -> mistakenly: I typod this and also let's go for a simpler word

• e358e477
  by Sylvain Henry at 2025-06-24T15:31:58-04:00

  Bump stack resolver to use GHC 9.6.7
  
  Cf #26139
  

• 4bf5eb63
  by fendor at 2025-06-25T17:05:43-04:00

  Teach `:reload` about multiple home units
  
  `:reload` needs to lookup the `ModuleName` and must not assume the given
  `ModuleName` is in the current `HomeUnit`.
  
  We add a new utility function which allows us to find a `HomeUnitModule`
  instead of a `Module`.
  
  Further, we introduce the `GhciCommandError` type which can be used to
  abort the execution of a GHCi command.
  This error is caught and printed in a human readable fashion.
  

• b3d97bb3
  by fendor at 2025-06-25T17:06:25-04:00

  Implement `-fno-load-initial-targets` flag
  
  We add the new flag `-fno-load-initial-targets` which doesn't load all `Target`s
  immediately but only computes the module graph for all `Target`s.
  The user can then decide to load modules from that module graph using
  the syntax:
  
      ghci> :reload <Mod>
  
  This will load everything in the module graph up to `Mod`.
  
  The user can return to the initial state by using the builtin target
  `none` to unload all modules.
  
      ghci> :reload none
  
  Is in principle identical to starting a new session with the
  `-fno-load-initial-targets` flag.
  
  The `-fno-load-initial-targets` flag allows for faster startup time of GHCi when a
  user has lots of `Target`s.
  
  We additionally extend the `:reload` command to accept multiple
  `ModuleName`s. For example:
  
      ghci> :reload <Mod1> <Mod2>
  
  Loads all modules up to the modules `Mod1` and `Mod2`.
  

• 49f44e52
  by Teo Camarasu at 2025-06-26T04:19:51-04:00

  Expose ghc-internal unit id through the settings file
  
  This in combination with the unit id of the compiler library allows
  cabal to know of the two unit ids that should not be reinstalled (in
  specific circumstances) as:
  - when using plugins, we want to link against exactly the compiler unit
  id
  - when using TemplateHaskell we want to link against exactly the package
  that contains the TemplateHaskell interfaces, which is `ghc-internal`
  
  See: <https://github.com/haskell/cabal/issues/10087>
  
  Resolves #25282
  

• 499c4efe
  by Bryan Richter at 2025-06-26T04:20:33-04:00

  CI: Fix and clean up capture of timings
  
  * Fixes the typo that caused 'cat ci-timings' to report "no such file or
    directory"
  * Gave ci_timings.txt a file extension so it may play better with other
    systems
  * Fixed the use of time_it so all times are recorded
  * Fixed time_it to print name along with timing
  

• 86c90c9e
  by Bryan Richter at 2025-06-26T04:20:33-04:00

  CI: Update collapsible section usage
  
  The syntax apparently changed at some point.
  

• 04308ee4
  by Bryan Richter at 2025-06-26T04:20:33-04:00

  CI: Add more collapsible sections
  

• 43b606bb
  by Florian Ragwitz at 2025-06-27T16:31:26-04:00

  Tick uses of wildcard/pun field binds as if using the record selector function
  
  Fixes #17834.
  
  See Note [Record-selector ticks] for additional reasoning behind this as well
  as an overview of the implementation details and future improvements.
  

• d4952549
  by Ben Gamari at 2025-06-27T16:32:08-04:00

  testsuite/caller-cc: Make CallerCc[123] less sensitive
  
  These were previously sensitive to irrelevant changes in program
  structure. To avoid this we filter out all by lines emitted by the
  -fcaller-cc from the profile.
  

• 8d33d048
  by Berk Özkütük at 2025-07-07T20:42:20-04:00

  Consider `PromotedDataCon` in `tyConStupidTheta`
  
  Haddock checks data declarations for the stupid theta so as not to
  pretty-print them as empty contexts. Type data declarations end up as
  `PromotedDataCon`s by the time Haddock performs this check, causing a
  panic. This commit extends `tyConStupidTheta` so that it returns an
  empty list for `PromotedDataCon`s. This decision was guided by the fact
  that type data declarations never have data type contexts (see (R1) in
  Note [Type data declarations]).
  
  Fixes #25739.
  

• a26243fd
  by Ryan Hendrickson at 2025-07-07T20:43:07-04:00

  haddock: Document instances from other packages
  
  When attaching instances to `Interface`s, it isn't enough just to look
  for instances in the list of `Interface`s being processed. We also need
  to look in the modules on which they depend, including those outside of
  this package.
  
  Fixes #25147.
  Fixes #26079.
  

• 0fb24420
  by Rodrigo Mesquita at 2025-07-07T20:43:49-04:00

  hadrian: Fallback logic for internal interpreter
  
  When determining whether to build the internal interpreter, the `make`
  build system had a fallback case for platforms not in the list of
  explicitly-supported operating systems and architectures.
  
  This fallback says we should try to build the internal interpreter if
  building dynamic GHC programs (if the architecture is unknown).
  
  Fixes #24098
  

• fe925bd4
  by Ben Gamari at 2025-07-07T20:44:30-04:00

  users-guide: Reference Wasm FFI section
  

• 5856284b
  by Ben Gamari at 2025-07-07T20:44:30-04:00

  users-guide: Fix too-short heading warning
  

• a48dcdf3
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Reorganise documentation for allocate* functions
  
  Consolodate interface information into the .h file, keeping just
  implementation details in the .c file.
  
  Use Notes stlye in the .h file and refer to notes from the .c file.
  

• de5b528c
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Introduce common utilities for allocating arrays
  
  The intention is to share code among the several places that do this
  already.
  

• b321319d
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in Heap.c
  
  The CMM primop can now report heap overflow.
  

• 1d557ffb
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in ThreadLabels.c
  
  Replacing a local utility.
  

• e59a1430
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in Threads.c
  
  Replacing local open coded version.
  

• 482df1c9
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Add exitHeapOverflow helper utility
  
  This will be useful with the array alloc functions, since unlike
  allocate/allocateMaybeFail, they do not come in two versions. So if it's
  not convenient to propagate failure, then one can use this.
  

• 4d3ec8f9
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in Weak.c
  
  Also add a cpp macro CCS_SYSTEM_OR_NULL which does what it says. The
  benefit of this is that it allows us to referece CCS_SYSTEM even when
  we're not in PROFILING mode. That makes abstracting over profiling vs
  normal mode a lot easier.
  

• 0c4f2fde
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Convert the array alloc primops to use the new array alloc utils
  

• a3354ad9
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  While we're at it, add one missing 'likely' hint
  
  To a cmm primops that raises an exception, like the others now do.
  

• 33b546bd
  by meooow25 at 2025-07-07T20:46:09-04:00

  Keep scanl' strict in the head on rewrite
  
  `scanl'` forces elements to WHNF when the corresponding `(:)`s are
  forced. The rewrite rule for `scanl'` missed forcing the first element,
  which is fixed here with a `seq`.
  

• 8a69196e
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  debugger/rts: Allow toggling step-in per thread
  
  The RTS global flag `rts_stop_next_breakpoint` globally sets the
  interpreter to stop at the immediate next breakpoint.
  
  With this commit, single step mode can additionally be set per thread in
  the TSO flag (TSO_STOP_NEXT_BREAKPOINT).
  
  Being able to toggle "stop at next breakpoint" per thread is an
  important requirement for implementing "stepping out" of a function in a
  multi-threaded context.
  
  And, more generally, having a per-thread flag for single-stepping paves the
  way for multi-threaded debugging.
  
  That said, when we want to enable "single step" mode for the whole
  interpreted program we still want to stop at the immediate next
  breakpoint, whichever thread it belongs to.
  
  That's why we also keep the global `rts_stop_next_breakpoint` flag, with
  `rts_enableStopNextBreakpointAll` and `rts_disableStopNextBreakpointAll` helpers.
  
  Preparation for #26042
  

• 73d3f864
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  docs: Case continuation BCOs
  
  This commit documents a subtle interaction between frames for case BCOs
  and their parents frames. Namely, case continuation BCOs may refer to
  (non-local) variables that are part of the parent's frame.
  
  The note expanding a bit on these details is called [Case continuation BCOs]
  

• d7aeddcf
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  debugger: Implement step-out feature
  
  Implements support for stepping-out of a function (aka breaking right after
  returning from a function) in the interactive debugger.
  
  It also introduces a GHCi command :stepout to step-out of a function
  being debugged in the interpreter. The feature is described as:
  
      Stop at the first breakpoint immediately after returning from the current
      function scope.
  
      Known limitations: because a function tail-call does not push a stack
      frame, if step-out is used inside of a function that was tail-called,
      execution will not be returned to its caller, but rather its caller's
      first non-tail caller. On the other hand, it means the debugger
      follows the more realistic execution of the program.
      In the following example:
  
      .. code-block:: none
  
      f = do
         a
         b <--- (1) set breakpoint then step in here
         c
      b = do
         ...
         d <--- (2) step-into this tail call
      d = do
         ...
         something <--- (3) step-out here
         ...
  
      Stepping-out will stop execution at the `c` invokation in `f`, rather than
      stopping at `b`.
  
  The key idea is simple: When step-out is enabled, traverse the runtime
  stack until a continuation BCO is found -- and enable the breakpoint
  heading that BCO explicitly using its tick-index.
  The details are specified in `Note [Debugger: Step-out]` in `rts/Interpreter.c`.
  
  Since PUSH_ALTS BCOs (representing case continuations) were never headed
  by a breakpoint (unlike the case alternatives they push), we introduced
  the BRK_ALTS instruction to allow the debugger to set a case
  continuation to stop at the breakpoint heading the alternative that is
  taken. This is further described in `Note [Debugger: BRK_ALTS]`.
  
  Fixes #26042
  

• 5d9adf51
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  debugger: Filter step-out stops by SrcSpan
  
  To implement step-out, the RTS looks for the first continuation frame on
  the stack and explicitly enables its entry breakpoint. However, some
  continuations will be contained in the function from which step-out was
  initiated (trivial example is a case expression).
  
  Similarly to steplocal, we will filter the breakpoints at which the RTS
  yields to the debugger based on the SrcSpan. When doing step-out, only
  stop if the breakpoint is /not/ contained in the function from which we
  initiated it.
  
  This is especially relevant in monadic statements such as IO which is
  compiled to a long chain of case expressions.
  
  See Note [Debugger: Filtering step-out stops]
  

• 7677adcc
  by Cheng Shao at 2025-07-08T07:40:29-04:00

  compiler: make ModBreaks serializable
  

• 14f67c6d
  by Rodrigo Mesquita at 2025-07-08T07:40:29-04:00

  refactor: "Inspecting the session" moved from GHC
  
  Moved utilities for inspecting the session from the GHC module to
  GHC.Driver.Session.Inspect
  
  Purely a clean up
  

• 9d3f484a
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Pass the HUG to readModBreaks, not HscEnv
  
  A minor cleanup. The associated history and setupBreakpoint functions
  are changed accordingly.
  

• b595f713
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Move readModBreaks to GHC.Runtime.Interpreter
  
  With some small docs changes
  

• d223227a
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Move interpreterProfiled to Interp.Types
  
  Moves interpreterProfiled and interpreterDynamic to
  GHC.Runtime.Interpreter.Types from GHC.Runtime.Interpreter.
  

• 7fdd0a3d
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Don't import GHC in Debugger.Breakpoints
  
  Remove the top-level
  
      import GHC
  
  from GHC.Runtime.Debugger.Breakpoints
  
  This makes the module dependencies more granular and cleans up the
  qualified imports from the code.
  

• 5e4da31b
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  refactor: Use BreakpointId in Core and Ifaces
  

• 741ac3a8
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  stg2bc: Derive BcM via ReaderT StateT
  
  A small refactor that simplifies GHC.StgToByteCode by deriving-via the
  Monad instances for BcM. This is done along the lines of previous
  similar refactors like 72b54c0760bbf85be1f73c1a364d4701e5720465.
  

• 0414fcc9
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  refact: Split InternalModBreaks out of ModBreaks
  
  There are currently two competing ways of referring to a Breakpoint:
  
      1. Using the Tick module + Tick index
      2. Using the Info module + Info index
  
  1. The Tick index is allocated during desugaring in `mkModBreaks`. It is
  used to refer to a breakpoint associated to a Core Tick. For a given
  Tick module, there are N Ticks indexed by Tick index.
  
  2. The Info index is allocated during code generation (in StgToByteCode)
  and uniquely identifies the breakpoints at runtime (and is indeed used
  to determine which breakpoint was hit at runtime).
  
  Why we need both is described by Note [Breakpoint identifiers].
  
  For every info index we used to keep a `CgBreakInfo`, a datatype containing
  information relevant to ByteCode Generation, in `ModBreaks`.
  
  This commit splits out the `IntMap CgBreakInfo` out of `ModBreaks` into
  a new datatype `InternalModBreaks`.
  
      - The purpose is to separate the `ModBreaks` datatype, which stores
        data associated from tick-level information which is fixed after
        desugaring, from the unrelated `IntMap CgBreakInfo` information
        accumulated during bytecode generation.
  
      - We move `ModBreaks` to GHC.HsToCore.Breakpoints
  
  The new `InternalModBreaks` simply combines the `IntMap CgBreakInfo`
  with `ModBreaks`. After code generation we construct an
  `InternalModBreaks` with the `CgBreakInfo`s we accumulated and the
  existing `ModBreaks` and store that in the compiled BCO in `bc_breaks`.
  
      - Note that we previously only updated the `modBreaks_breakInfo`
        field of `ModBreaks` at this exact location, and then stored the
        updated `ModBreaks` in the same `bc_breaks`.
  
      - We put this new datatype in GHC.ByteCode.Breakpoints
  
  The rest of the pipeline for which CgBreakInfo is relevant is
  accordingly updated to also use `InternalModBreaks`
  

• 2a097955
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Use BreakpointIds in bytecode gen
  
  Small clean up to use BreakpointId and InternalBreakpointId more
  uniformly in bytecode generation rather than using Module + Ix pairs
  

• 0515cc2f
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  ghci: Allocate BreakArrays at link time only
  
  Previously, a BreakArray would be allocated with a slot for every tick
  in a module at `mkModBreaks`, in HsToCore. However, this approach has
  a few downsides:
  
  - It interleaves interpreter behaviour (allocating arrays for
    breakpoints) within the desugarer
  
  - It is inflexible in the sense it is impossible for the bytecode
    generator to add "internal" breakpoints that can be triggered at
    runtime, because those wouldn't have a source tick. (This is relevant
    for our intended implementation plan of step-out in #26042)
  
  - It ties the BreakArray indices to the *tick* indexes, while at runtime
    we would rather just have the *info* indexes (currently we have both
    because BreakArrays are indexed by the *tick* one).
  
  Paving the way for #26042 and #26064, this commit moves the allocation
  of BreakArrays to bytecode-loading time -- akin to what is done for CCS
  arrays.
  
  Since a BreakArray is allocated only when bytecode is linked, if a
  breakpoint is set (e.g. `:break 10`) before the bytecode is linked,
  there will exist no BreakArray to trigger the breakpoint in.
  
  Therefore, the function to allocate break arrays (`allocateBreakArrays`)
  is exposed and also used in GHC.Runtime.Eval to allocate a break array
  when a breakpoint is set, if it doesn't exist yet (in the linker env).
  

• 8016561f
  by Simon Peyton Jones at 2025-07-08T07:41:13-04:00

  Add a test for T26176
  

• 454cd682
  by Simon Peyton Jones at 2025-07-08T07:41:13-04:00

  Add test for #14010
  
  This test started to work in GHC 9.6 and has worked since.
  This MR just adds a regression test
  

• ea2c6673
  by Teo Camarasu at 2025-07-08T13:24:43-04:00

  Implement user-defined allocation limit handlers
  
  Allocation Limits allow killing a thread if they allocate more than a
  user-specified limit.
  We extend this feature to allow more versatile behaviour.
  
  - We allow not killing the thread if the limit is exceeded.
  - We allow setting a custom handler to be called when the limit is exceeded.
  
  User-specified allocation limit handlers run in a fresh thread and are passed
  the ThreadId of the thread that exceeded its limit.
  
  We introduce utility functions for getting and setting the allocation
  limits of other threads, so that users can reset the limit of a thread
  from a handler. Both of these are somewhat coarse-grained as we are
  unaware of the allocations in the current nursery chunk.
  
  We provide several examples of usages in testsuite/tests/rts/T22859.hs
  
  Resolves #22859
  

• 03e047f9
  by Simon Hengel at 2025-07-08T13:25:25-04:00

  Fix typo in using.rst
  

• 67957854
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  compiler: Import AnnotationWrapper from ghc-internal
  
  Since `GHC.Desugar` exported from `base` has been deprecated.
  

• 813d99d6
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  ghc-compact: Eliminate dependency on ghc-prim
  

• 0ec952a1
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  ghc-heap: Eliminate dependency on ghc-prim
  

• 480074c3
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  ghc-heap: Drop redundant import
  

• 03455829
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  ghc-prim: Bump version to 0.13.1
  
  There are no interface changes from 0.13.0 but the implementation now
  lives in `ghc-internal`.
  

• d315345a
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  template-haskell: Bump version number to 2.24.0.0
  
  Bumps exceptions submodule.
  

• 004c800e
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  Bump GHC version number to 9.14
  

• eb1a3816
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  Bump parsec to 3.1.18.0
  
  Bumps parsec submodule.
  

• 86f83296
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  unix: Bump to 2.8.7.0
  
  Bumps unix submodule.
  

• 89e13998
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  binary: Bump to 0.8.9.3
  
  Bumps binary submodule.
  

• 55fff191
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  Win32: Bump to 2.14.2.0
  
  Bumps Win32 submodule.
  

• 7dafa40c
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  base: Bump version to 4.22.0
  
  Bumps various submodules.
  

• ef03d8b8
  by Rodrigo Mesquita at 2025-07-09T09:45:28-04:00

  base: Export displayExceptionWithInfo
  
  This function should be exposed from base following CLC#285
  
  Approved change in CLC#344
  
  Fixes #26058
  

• 01d3154e
  by Wen Kokke at 2025-07-10T17:06:36+01:00

  Fix documentation for HEAP_PROF_SAMPLE_STRING
  

• ac259c48
  by Wen Kokke at 2025-07-10T17:06:38+01:00

  Fix documentation for HEAP_PROF_SAMPLE_COST_CENTRE
  

• 2b4db9ba
  by Pi Delport at 2025-07-11T16:40:52-04:00

  (Applicative docs typo: missing "one")
  

• f707bab4
  by Andreas Klebinger at 2025-07-12T14:56:16+01:00

  Specialise: Improve specialisation by refactoring interestingDict
  
  This MR addresses #26051, which concerns missed type-class specialisation.
  The main payload of the MR is to completely refactor the key function
        `interestingDict` in GHC.Core.Opt.Specialise
  
  The main change is that we now also look at the structure of the
  dictionary we consider specializing on, rather than only the type.
  
  See the big `Note [Interesting dictionary arguments]`
  

• ca7a9d42
  by Simon Peyton Jones at 2025-07-12T14:56:16+01:00

  Treat tuple dictionaries uniformly; don't unbox them
  
  See `Note [Do not unbox class dictionaries]` in DmdAnal.hs,
  sep (DNB1).
  
  This MR reverses the plan in #23398, which suggested a special case to
  unbox tuple dictionaries in worker/wrapper.  But:
  
  - This was the cause of a pile of complexity in the specialiser (#26158)
  
  - Even with that complexity, specialision was still bad, very bad
    See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297
  
  And it's entirely unnecessary!  Specialision works fine without
  unboxing tuple dictionaries.
  

• be7296c9
  by Andreas Klebinger at 2025-07-12T14:56:16+01:00

  Remove complex special case from the type-class specialiser
  
  There was a pretty tricky special case in Specialise which is no
  longer necessary.
     * Historical Note [Floating dictionaries out of cases]
     * #26158
     * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297
  
  This MR removes it.  Hooray.
  

• 4acf3a86
  by Ben Gamari at 2025-07-15T05:46:32-04:00

  configure: bump version to 9.15
  

• 45efaf71
  by Teo Camarasu at 2025-07-15T05:47:13-04:00

  rts/nonmovingGC: remove n_free
  
  We remove the nonmovingHeap.n_free variable.
  
  We wanted this to track the length of nonmovingHeap.free.
  But this isn't possible to do atomically.
  
  When this isn't accurate we can get a segfault by going past the end of
  the list.
  
  Instead, we just count the length of the list when we grab it in
  nonmovingPruneFreeSegment.
  
  Resolves #26186
  

• c635f164
  by Ben Gamari at 2025-07-15T14:05:54-04:00

  configure: Drop probing of ld.gold
  
  As noted in #25716, `gold` has been dropped from binutils-2.44.
  
  Fixes #25716.
  
  Metric Increase:
      size_hello_artifact_gzip
      size_hello_unicode_gzip
      ghc_prim_so
  

• 637bb538
  by Ben Gamari at 2025-07-15T14:05:55-04:00

  testsuite/recomp015: Ignore stderr
  
  This is necessary since ld.bfd complains
  that we don't have a .note.GNU-stack section,
  potentially resulting in an executable stack.

• d3cd4ec8
  by Wen Kokke at 2025-07-15T14:06:39-04:00

  Fix documentation for heap profile ID
  

• 73082769
  by Ben Gamari at 2025-07-15T16:56:38-04:00

  Bump win32-tarballs to v0.9

• 3b63b254
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  rts/LoadArchive: Handle null terminated string tables
  
  As of `llvm-ar` now emits filename tables terminated with null
  characters instead of the usual POSIX `/\n` sequence.
  
  Fixes #26150.
  

• 195f6527
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: rename label so name doesn't conflict with param
  

• 63373b95
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Handle API set symbol versioning conflicts
  

• 48e9aa3e
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Mark API set symbols as HIDDEN and correct symbol type
  

• 959e827a
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Implement WEAK EXTERNAL undef redirection by target symbol name
  

• 65f19293
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  rts/LoadArchive: Handle string table entries terminated with /
  
  llvm-ar appears to terminate string table entries with `/\n` [1]. This
  matters in the case of thin archives, since the filename is used. In the
  past this worked since `llvm-ar` would produce archives with "small"
  filenames when possible. However, now it appears to always use the
  string table.
  
  [1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe2488e6a0a8/llvm/lib/Object/ArchiveWriter.cpp#L314
  

• 9cbb3ef5
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  testsuite: Mark T12497 as fixed
  
  Thanks to the LLVM toolchain update.
  
  Closes #22694.
  

• 2854407e
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows
  
  The archive member number changed due to the fact that llvm-ar now uses a
  string table.
  

• 28439593
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL
  
  This appears to now be used by libc++ as distributed by msys2.
  

• 2b053755
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent
  

• e8acd2e7
  by Wen Kokke at 2025-07-16T08:37:04-04:00

  Remove the `profile_id` parameter from various RTS functions.
  
  Various RTS functions took a `profile_id` parameter, intended to be used to
  distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However,
  this feature was never implemented and the `profile_id` parameter was set to 0
  throughout the RTS. This commit removes the parameter but leaves the hardcoded
  profile ID in the functions that emit the encoded eventlog events as to not
  change the protocol.
  
  The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`,
  `traceHeapProfSampleString`, `postHeapProfSampleString`,
  `traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`.
  

• 76d392a2
  by Wen Kokke at 2025-07-16T08:37:04-04:00

  Make `traceHeapProfBegin` an init event.
  

• bbaa44a7
  by Peng Fan at 2025-07-16T16:50:42-04:00

  NCG/LA64: Support finer-grained DBAR hints
  
  For LA664 and newer uarchs, they have made finer granularity hints
  available:
  
      Bit4: ordering or completion (0: completion, 1: ordering)
      Bit3: barrier for previous read (0: true, 1: false)
      Bit2: barrier for previous write (0: true, 1: false)
      Bit1: barrier for succeeding read (0: true, 1: false)
      Bit0: barrier for succeeding write (0: true, 1: false)
  
  And not affect the existing models because other hints are treated
  as 'dbar 0' there.
  

• 7da86e16
  by Andreas Klebinger at 2025-07-16T16:51:25-04:00

  Disable -fprof-late-overloaded-calls for join points.
  
  Currently GHC considers cost centres as destructive to
  join contexts. Or in other words this is not considered valid:
  
      join f x = ...
      in
                ... -> scc<tick> jmp
  
  This makes the functionality of `-fprof-late-overloaded-calls` not feasible
  for join points in general. We used to try to work around this by putting the
  ticks on the rhs of the join point rather than around the jump. However beyond
  the loss of accuracy this was broken for recursive join points as we ended up
  with something like:
  
      rec-join f x = scc<tick> ... jmp f x
  
  Which similarly is not valid as the tick once again destroys the tail call.
  One might think we could limit ourselves to non-recursive tail calls and do
  something clever like:
  
    join f x = scc<tick> ...
    in ... jmp f x
  
  And sometimes this works! But sometimes the full rhs would look something like:
  
    join g x = ....
    join f x = scc<tick> ... -> jmp g x
  
  Which, would again no longer be valid. I believe in the long run we can make
  cost centre ticks non-destructive to join points. Or we could keep track of
  where we are/are not allowed to insert a cost centre. But in the short term I will
  simply disable the annotation of join calls under this flag.
  

• 7ee22fd5
  by ARATA Mizuki at 2025-07-17T06:05:30-04:00

  x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2#
  
  The new implementation
  
  * make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and
  * do not require -mavx.
  
  Close #26096
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• c6cd2da1
  by Jappie Klooster at 2025-07-17T06:06:20-04:00

  Update interact docs to explain about buffering
  
  We need to tell the user to set to the
  appropriate buffer format.
  Otherwise, this function may get randomly stuck,
  or just behave confusingly.
  
  issue: https://gitlab.haskell.org/ghc/ghc/-/issues/26131
  
  NB, I'm running this with cabal *NOT* ghci. ghci messes with buffering anyway.
  
  ```haskell
  interaction :: String -> String
  interaction "jappie" = "hi"
  interaction "jakob" = "hello"
  interaction x = "unkown input: " <> x
  
  main :: IO ()
  main = interact  interaction
  ```
  so in my input (prefixed by `>`) I get:
  
  ```
  > jappie
  unkown input: jappie
  ```
  
  we confirmed later this was due to lack of \n matching.
  Anyway movnig on to more unexpected stuff:
  
  ```haskell
  main :: IO ()
  main = do
    interact  (concatMap interaction . lines)
  ```
  
  get's stuck forever.
  actually `^D` (ctrl+d) unstucks it and runs all input as expected.
  for example you can get:
  ```
  > sdfkds
  > fakdsf
  unkown input: sdfkdsunkown input: fakdsf
  ```
  
  This program works!
  ```haskell
  interaction :: String -> String
  interaction "jappie" = "hi \n"
  interaction "jakob" = "hello \n"
  interaction x = "unkown input: " <> x <> "\n"
  
  main :: IO ()
  main = do
    interact  (concatMap interaction . lines)
  ```
  the reason is that linebuffering is set for both in and output by default.
  so lines eats the input lines, and all the \n postfixes make sure the buffer
  is put out.
  

• 9fa590a6
  by Zubin Duggal at 2025-07-17T06:07:03-04:00

  fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory
  
  Fixes #24093
  

• cc650b4b
  by Andrew Lelechenko at 2025-07-17T12:30:24-04:00

  Add Data.List.NonEmpty.mapMaybe
  
  As per https://github.com/haskell/core-libraries-committee/issues/337
  

• 360fa82c
  by Duncan Coutts at 2025-07-17T12:31:14-04:00

  base: Deprecate GHC.Weak.Finalize.runFinalizerBatch
  
  https://github.com/haskell/core-libraries-committee/issues/342
  

• f4e8466c
  by Alan Zimmerman at 2025-07-17T12:31:55-04:00

  EPA: Update exact printing based on GHC 9.14 tests
  
  As a result of migrating the GHC ghc-9.14 branch tests to
  ghc-exactprint in
  https://github.com/alanz/ghc-exactprint/tree/ghc-9.14, a couple of
  discrepancies were picked up
  
  - The opening paren for a DefaultDecl was printed in the wrong place
  - The import declaration level specifiers were not printed.
  
  This commit adds those fixes, and some tests for them.
  The tests brought to light that the ImportDecl ppr instance had not
  been updated for level specifiers, so it updates that too.
  

• 8b731e3c
  by Matthew Pickering at 2025-07-21T13:36:43-04:00

  level imports: Fix infinite loop with cyclic module imports
  
  I didn't anticipate that downsweep would run before we checked for
  cyclic imports. Therefore we need to use the reachability function which
  handles cyclic graphs.
  
  Fixes #26087
  

• d751a9f1
  by Pierre Thierry at 2025-07-21T13:37:28-04:00

  Fix documentation about deriving from generics
  

• f8d9d016
  by Andrew Lelechenko at 2025-07-22T21:13:28-04:00

  Fix issues with toRational for types capable to represent infinite and not-a-number values
  
  This commit fixes all of the following pitfalls:
  
  > toRational (read "Infinity" :: Double)
  179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216 % 1
  > toRational (read "NaN" :: Double)
  269653970229347386159395778618353710042696546841345985910145121736599013708251444699062715983611304031680170819807090036488184653221624933739271145959211186566651840137298227914453329401869141179179624428127508653257226023513694322210869665811240855745025766026879447359920868907719574457253034494436336205824 % 1
  
  > realToFrac (read "NaN" :: Double) -- With -O0
  Infinity
  > realToFrac (read "NaN" :: Double) -- With -O1
  NaN
  
  > realToFrac (read "NaN" :: Double) :: CDouble
  Infinity
  > realToFrac (read "NaN" :: CDouble) :: Double
  Infinity
  
  Implements https://github.com/haskell/core-libraries-committee/issues/338
  

• 5dabc718
  by Zubin Duggal at 2025-07-22T21:14:10-04:00

  haddock: Don't warn about missing link destinations for derived names.
  
  Fixes #26114
  

• 9c3a0937
  by Matthew Pickering at 2025-07-22T21:14:52-04:00

  template haskell: use a precise condition when implicitly lifting
  
  Implicit lifting corrects a level error by replacing references to `x`
  with `$(lift x)`, therefore you can use a level `n` binding at level `n
  + 1`, if it can be lifted.
  
  Therefore, we now have a precise check that the use level is 1 more than
  the bind level.
  
  Before this bug was not observable as you only had 0 and 1 contexts but
  it is easily evident when using explicit level imports.
  
  Fixes #26088
  

• 5144b22f
  by Andreas Klebinger at 2025-07-22T21:15:34-04:00

  Add since tag and more docs for do-clever-arg-eta-expansion
  
  Fixes #26113
  

• c865623b
  by Andreas Klebinger at 2025-07-22T21:15:34-04:00

  Add since tag for -fexpose-overloaded-unfoldings
  
  Fixes #26112
  

• 49a44ab7
  by Simon Hengel at 2025-07-23T17:59:55+07:00

  Refactor GHC.Driver.Errors.printMessages
  

• 84711c39
  by Simon Hengel at 2025-07-23T18:27:34+07:00

  Respect `-fdiagnostics-as-json` for error messages from pre-processors
  
  (fixes #25480)
  

• d046b5ab
  by Simon Hengel at 2025-07-24T06:12:05-04:00

  Include the rendered message in -fdiagnostics-as-json output
  
  This implements #26173.
  

• d2b89603
  by Ben Gamari at 2025-07-24T06:12:47-04:00

  rts/Interpreter: Factor out ctoi tuple info tables into data
  
  Instead of a massive case let's put this into data which we can reuse
  elsewhere.
  

• 4bc78496
  by Sebastian Graf at 2025-07-24T16:19:34-04:00

  CprAnal: Detect recursive newtypes (#25944)
  
  While `cprTransformDataConWork` handles recursive data con workers, it
  did not detect the case when a newtype is responsible for the recursion.
  This is now detected in the `Cast` case of `cprAnal`.
  
  The same reproducer made it clear that `isRecDataCon` lacked congruent
  handling for `AppTy` and `CastTy`, now fixed.
  
  Furthermore, the new repro case T25944 triggered this bug via an
  infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`.
  While it should be much less likely to trigger such an infinite loop now
  that `isRecDataCon` has been fixed, I made sure to abort the loop after
  10 iterations and emitting a warning instead.
  
  Fixes #25944.
  

• 0a583689
  by Sylvain Henry at 2025-07-24T16:20:26-04:00

  STM: don't create a transaction in the rhs of catchRetry# (#26028)
  
  We don't need to create a transaction for the rhs of (catchRetry#)
  because contrary to the lhs we don't need to abort it on retry. Moreover
  it is particularly harmful if we have code such as (#26028):
  
    let cN = readTVar vN >> retry
        tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
    atomically tree
  
  Because it will stack transactions for the rhss and the read-sets of all
  the transactions will be iteratively merged in O(n^2) after the
  execution of the most nested retry.
  

• a49eca26
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Renaming around predicate types
  
  .. we were (as it turned out) abstracting over
  type-class selectors in SPECIALISATION rules!
  
  Wibble isEqPred
  

• f80375dd
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Refactor of Specialise.hs
  
  This patch just tidies up `specHeader` a bit, removing one
  of its many results, and adding some comments.
  
  No change in behaviour.
  
  Also add a few more `HasDebugCallStack` contexts.
  

• 1bd12371
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Improve treatment of SPECIALISE pragmas -- again!
  
  This MR does another major refactor of the way that SPECIALISE
  pragmas work, to fix #26115, #26116, #26117.
  
  * We now /always/ solve forall-constraints in an all-or-nothing way.
    See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve
  
    This means we might have unsolved quantified constraints, which need
    to be reported.  See `inert_insts` in `getUnsolvedInerts`.
  
  * I refactored the short-cut solver for type classes to work by
    recursively calling the solver rather than by having a little baby
    solver that kept being not clever enough.
    See Note [Shortcut solving] in GHC.Tc.Solver.Dict
  
  * I totally rewrote the desugaring of SPECIALISE pragmas, again.
    The new story is in Note [Desugaring new-form SPECIALISE pragmas]
    in GHC.HsToCore.Binds
  
    Both old-form and new-form SPECIALISE pragmas now route through the same
    function `dsSpec_help`.   The tricky function `decomposeRuleLhs` is now used only
    for user-written RULES, not for SPECIALISE pragmas.
  
  * I improved `solveOneFromTheOther` to account for rewriter sets. Previously
    it would solve a non-rewritten dict from a rewritten one.  For equalities
    we were already dealing with this, in
  
  Some incidental refactoring
  
  * A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather
    than a set of tyvars.  We just delay taking the free vars.
  
  * GHC.Core.FVs.exprFVs now returns /all/ free vars.
    Use `exprLocalFVs` for Local vars.
    Reason: I wanted another variant for /evidence/ variables.
  
  * Ues `EvId` in preference to `EvVar`.  (Evidence variables are always Ids.)
    Rename `isEvVar` to `isEvId`.
  
  * I moved `inert_safehask` out of `InertCans` and into `InertSet` where it
    more properly belongs.
  
  Compiler-perf changes:
    * There was a palpable bug (#26117) which this MR fixes in
      newWantedEvVar, which bypassed all the subtle overlapping-Given
      and shortcutting logic.  (See the new `newWantedEvVar`.)  Fixing this
      but leads to extra dictionary bindings; they are optimised away quickly
      but they made CoOpt_Read allocate 3.6% more.
  
    * Hpapily T15164 improves.
  
    * The net compiler-allocation change is 0.0%
  
  Metric Decrease:
      T15164
  Metric Increase:
      CoOpt_Read
      T12425
  

• 953fd8f1
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Solve forall-constraints immediately, or not at all
  
  This MR refactors the constraint solver to solve forall-constraints immediately,
  rather than emitting an implication constraint to be solved later.
  
  The most immediate motivation was that when solving quantified constraints
  in SPECIALISE pragmas, we really really don't want to leave behind half-
  solved implications.  Also it's in tune with the approach of the new
  short-cut solver, which recursively invokes the solver.
  
  It /also/ saves quite a bit of plumbing; e.g
  
    - The `wl_implics` field of `WorkList` is gone,
  
    - The types of `solveSimpleWanteds` and friends are simplified.
  
    - An EvFun contains binding, rather than an EvBindsVar ref-cell that
      will in the future contain bindings.  That makes `evVarsOfTerm`
      simpler.  Much nicer.
  
  It also improves error messages a bit.
  
  All described in Note [Solving a Wanted forall-constraint] in
  GHC.Tc.Solver.Solve.
  
  One tiresome point: in the tricky case of `inferConstraintsCoerceBased`
  we make a forall-constraint.  This we /do/ want to partially solve, so
  we can infer a suitable context. (I'd be quite happy to force the user to
  write a context, bt I don't want to change behavior.)  So we want to generate
  an /implication/ constraint in `emitPredSpecConstraints` rather than a
  /forall-constraint/ as we were doing before.  Discussed in (WFA3) of
  the above Note.
  
  Incidental refactoring
  
  * `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for
    the DerivEnv that the caller had just consulted.  Nicer to pass it as an
    argument I think, so I have done that.  No change in behaviour.
  

• 6921ab42
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Remove duplicated code in Ast.hs for evTermFreeVars
  
  This is just a tidy up.
  

• 1165f587
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Small tc-tracing changes only
  

• 0776ffe0
  by Simon Hengel at 2025-07-26T04:54:20-04:00

  Respect `-fdiagnostics-as-json` for core diagnostics (see #24113)
  

• cc1116e0
  by Andrew Lelechenko at 2025-07-26T04:55:01-04:00

  docs: add since pragma to Data.List.NonEmpty.mapMaybe
  

• ee2dc248
  by Simon Hengel at 2025-07-31T06:25:35-04:00

  Update comments on `OptKind` to reflect the code reality
  

• b029633a
  by Wen Kokke at 2025-07-31T06:26:21-04:00

  rts: Disable --eventlog-flush-interval unless compiled with -threaded.
  
  This commit fixes issue #26222:
  Using --eventlog-flush-interval with the non-threaded RTS leads to eventlog corruption.
  https://gitlab.haskell.org/ghc/ghc/-/issues/26222
  
  This commit makes three changes when code is compiled against the non-threaded RTS:
  
  1. It disables the --eventlog-flush-interval flag.
  2. It disables the documentation for the --eventlog-flush-interval flag.
  3. It disables the relevant state from RtsConfig and code from Timer.
  4. It updates the entry for --eventlog-flush-interval in the users guide.
  

• 31159f1d
  by Wen Kokke at 2025-07-31T06:26:21-04:00

  rts: Split T20006 into tests with and without -threaded
  

• 618687ef
  by Simon Hengel at 2025-07-31T06:27:03-04:00

  docs/users_guide/win32-dlls.rst: Remove references to `readline`
  

• 083e40f1
  by Rodrigo Mesquita at 2025-08-01T04:38:23-04:00

  debugger: Uniquely identify breakpoints by internal id
  
  Since b85b11994e0130ff2401dd4bbdf52330e0bcf776 (support inlining
  breakpoints), a breakpoint has been identified at runtime by *two* pairs
  of <module,index>.
  
  - The first, aka a 'BreakpointId', uniquely identifies a breakpoint in
    the source of a module by using the Tick index. A Tick index can index
    into ModBreaks.modBreaks_xxx to fetch source-level information about
    where that tick originated.
  
      - When a user specifies e.g. a line breakpoint using :break, we'll reverse
        engineer what a Tick index for that line
      - We update the `BreakArray` of that module (got from the
        LoaderState) at that tick index to `breakOn`.
      - A BCO we can stop at is headed by a BRK_FUN instruction. This
        instruction stores in an operand the `tick index` it is associated
        to. We look it up in the associated `BreakArray` (also an operand)
        and check wheter it was set to `breakOn`.
  
  - The second, aka the `ibi_info_mod` + `ibi_info_ix` of the
    `InternalBreakpointId`, uniquely index into the `imodBreaks_breakInfo`
    -- the information we gathered during code generation about the
    existing breakpoint *ocurrences*.
  
    - Note that with optimisation there may be many occurrences of the
      same source-tick-breakpoint across different modules. The
      `ibi_info_ix` is unique per occurrence, but the `bi_tick_ix` may be
      shared. See Note [Breakpoint identifiers] about this.
  
    - Note that besides the tick ids, info ids are also stored in
      `BRK_FUN` so the break handler can refer to the associated
      `CgBreakInfo`.
  
  In light of that, the driving changes come from the desire to have the
  info_id uniquely identify the breakpoint at runtime, and the source tick
  id being derived from it:
  
  - An InternalBreakpointId should uniquely identify a breakpoint just
    from the code-generation identifiers of `ibi_info_ix` and `ibi_info_mod`.
    So we drop `ibi_tick_mod` and `ibi_tick_ix`.
  - A BRK_FUN instruction need only record the "internal breakpoint id",
    not the tick-level id.
    So we drop the tick mod and tick index operands.
  - A BreakArray should be indexed by InternalBreakpointId rather than
    BreakpointId
  
  That means we need to do some more work when setting a breakpoint.
  Specifically, we need to figure out the internal ids (occurrences of a
  breakpoint) from the source-level BreakpointId we want to set the
  breakpoint at (recall :break refers to breaks at the source level).
  
  Besides this change being an improvement to the handling of breakpoints
  (it's clearer to have a single unique identifier than two competing
  ones), it unlocks the possibility of generating "internal" breakpoints
  during Cg (needed for #26042).
  It should also be easier to introduce multi-threaded-aware `BreakArrays`
  following this change (needed for #26064).
  
  Se also the new Note [ModBreaks vs InternalModBreaks]
  
  On i386-linux:
  
  -------------------------
  Metric Decrease:
      interpreter_steplocal
  -------------------------
  

• bf03bbaa
  by Simon Hengel at 2025-08-01T04:39:05-04:00

  Don't use MCDiagnostic for `ghcExit`
  
  This changes the error message of `ghcExit` from
  
  ```
  <no location info>: error:
  Compilation had errors
  
  ```
  to
  ```
  
  Compilation had errors
  
  ```
  

• a889ec75
  by Simon Hengel at 2025-08-01T04:39:05-04:00

  Respect `-fdiagnostics-as-json` for driver diagnostics (see #24113)
  

• 81577fe7
  by Ben Gamari at 2025-08-02T04:29:39-04:00

  configure: Allow override of CrossCompiling
  
  As noted in #26236, the current inference logic is a bit simplistic. In
  particular, there are many cases (e.g. building for a new libc) where
  the target and host triples may differ yet we are still able to run the
  produced artifacts as native code.
  
  Closes #26236.
  

• 01136779
  by Andreas Klebinger at 2025-08-02T04:30:20-04:00

  rts: Support COFF BigObj files in archives.
  

• 1f9e4f54
  by Stephen Morgan at 2025-08-03T15:14:08+10:00

  refactor: Modify Data.List.sortOn to use (>) instead of compare. (#26184)
  
  This lets a more efficient (>) operation be used if one exists.
  
  This is technically a breaking change for malformed Ord instances, where
  x > y is not equivalent to compare x y == GT.
  
  Discussed by the CLC in issue #332: https://github.com/haskell/core-libraries-committee/issues/332
  

• 4f6bc9cf
  by fendor at 2025-08-04T17:50:06-04:00

  Revert "base: Expose Backtraces constructor and fields"
  
  This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57.
  

• bcdec657
  by Zubin Duggal at 2025-08-05T10:37:29+05:30

  compiler: Export a version of `newNameCache` that is not prone to footguns.
  `newNameCache` must be initialized with both a non-"reserved" unique tag, as well
  as a list of known key names. Failing to do so results in hard to debug unique conflicts.
  
  It is difficult for API users to tell which unique tags are safe to use. So instead of leaving
  this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed
  non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations
  of the compiler.
  
  The original version of `newNameCache` is now exported as `newNameCache'` for advanced users.
  
  We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in
  functionality by `newNameCache` and `newNameCache'`.
  
  Fixes #26135 and #26055
  

• 57d3b4a8
  by Andrew Lelechenko at 2025-08-05T18:36:31-04:00

  hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2
  
  In line with #25693 we should use GHC 9.10 as a boot compiler,
  while Hadrian stack.yaml was stuck on GHC 9.6.
  

• c2a78cea
  by Peng Fan at 2025-08-05T18:37:27-04:00

  NCG/LA64: implement atomic write with finer-grained DBAR hints
  
  Signed-off-by: Peng Fan <fanpeng@loongson.cn>
  

• 95231c8e
  by Teo Camarasu at 2025-08-06T08:35:58-04:00

  CODEOWNERS: add CLC as codeowner of base
  
  We also remove hvr, since I think he is no longer active

• 77df0ded
  by Andrew Lelechenko at 2025-08-06T08:36:39-04:00

  Bump submodule text to 2.1.3
  

• 8af260d0
  by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00

  docs: fix internal import in getopt examples
  
  This external-facing doc example shouldn't mention GHC internals when
  using 'fromMaybe'.
  

• 69cc16ca
  by Marc Scholten at 2025-08-06T15:51:28-04:00

  README: Add note on ghc.nix
  

• 93a2f450
  by Daniel Díaz at 2025-08-06T15:52:14-04:00

  Link to the "Strict Bindings" docs from the linear types docs
  
  Strict Bidings are relevant for the kinds of multiplicity annotations
  linear lets support.
  

• 246b7853
  by Matthew Pickering at 2025-08-07T06:58:30-04:00

  level imports: Check the level of exported identifiers
  
  The level imports specification states that exported identifiers have to
  be at level 0. This patch adds the requird level checks that all
  explicitly mentioned identifiers occur at level 0.
  
  For implicit export specifications (T(..) and module B), only level 0
  identifiers are selected for re-export.
  
  ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705
  
  Fixes #26090
  

• 358bc4fc
  by fendor at 2025-08-07T06:59:12-04:00

  Bump GHC on darwin CI to 9.10.1
  

• 1903ae35
  by Matthew Pickering at 2025-08-07T12:21:10+01:00

  ipe: Place strings and metadata into specific .ipe section
  
  By placing the .ipe metadata into a specific section it can be stripped
  from the final binary if desired.
  
  ```
  objcopy --remove-section .ipe <binary>
  upx <binary>
  ```
  
  Towards #21766
  

• c80dd91c
  by Matthew Pickering at 2025-08-07T12:22:42+01:00

  ipe: Place magic word at the start of entries in the .ipe section
  
  The magic word "IPE\nIPE\n" is placed at the start of .ipe sections,
  then if the section is stripped, we can check whether the section starts
  with the magic word or not to determine whether there is metadata
  present or not.
  
  Towards #21766
  

• cab42666
  by Matthew Pickering at 2025-08-07T12:22:42+01:00

  ipe: Use stable IDs for IPE entries
  
  IPEs have historically been indexed and reported by their address.
  This makes it impossible to compare profiles between runs, since the
  addresses may change (due to ASLR) and also makes it tricky to separate
  out the IPE map from the binary.
  
  This small patch adds a stable identifier for each IPE entry.
  
  The stable identifier is a single 64 bit word. The high-bits are a
  per-module identifier and the low bits identify which entry in each
  module.
  
  1. When a node is added into the IPE buffer it is assigned a unique
     identifier from an incrementing global counter.
  2. Each entry already has an index by it's position in the
     `IpeBufferListNode`.
  
  The two are combined together by the `IPE_ENTRY_KEY` macro.
  
  Info table profiling uses the stable identifier rather than the address
  of the info table.
  
  The benefits of this change are:
  
  * Profiles from different runs can be easily compared
  * The metadata can be extracted from the binary (via the eventlog for
    example) and then stripped from the executable.
  
  Fixes #21766
  

• 2860a9a5
  by Simon Peyton Jones at 2025-08-07T20:29:18-04:00

  In TcSShortCut, typechecker plugins should get empty Givens
  
  Solving in TcShortCut mode means /ignoring the Givens/. So we
  should not pass them to typechecker plugins!
  
  Fixes #26258.
  
  This is a fixup to the earlier MR:
  
      commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06
      Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
      Date:   Mon Jul 21 10:04:49 2025 +0100
  
          Improve treatment of SPECIALISE pragmas -- again!
  

• 2157db2d
  by sterni at 2025-08-08T15:32:39-04:00

  hadrian: enable terminfo if --with-curses-* flags are given
  
  The GHC make build system used to support WITH_TERMINFO in ghc.mk which
  allowed controlling whether to build GHC with terminfo or not. hadrian
  has replaced this with a system where this is effectively controlled by
  the cross-compiling setting (the default WITH_TERMINFO value was bassed
  on CrossCompiling, iirc).
  
  This behavior is undesireable in some cases and there is not really a
  good way to work around it. Especially for downstream packagers,
  modifying this via UserSettings is not really feasible since such a
  source file has to be kept in sync with Settings/Default.hs manually
  since it can't import Settings.Default or any predefined Flavour
  definitions.
  
  To avoid having to add a new setting to cfg/system.config and/or a new
  configure flag (though I'm happy to implement both if required), I've
  chosen to take --with-curses-* being set explicitly as an indication
  that the user wants to have terminfo enabled. This would work for
  Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which
  goes to some extreme measures [3] [4] to force terminfo in all scenarios).
  
  In general, I'm an advocate for making the GHC build be the same for
  native and cross insofar it is possible since it makes packaging GHC and
  Haskell related things while still supporting cross much less
  compilicated. A more minimal GHC with reduced dependencies should
  probably be a specific flavor, not the default.
  
  Partially addresses #26288 by forcing terminfo to be built if the user
  explicitly passes configure flags related to it. However, it isn't built
  by default when cross-compiling yet nor is there an explicit way to
  control the package being built.
  
  [1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d06443760bb/pkgs/development/compilers/ghc/common-hadrian.nix#L513-L515
  [2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4f74d2cc85700042b/compiler/ghc/default.nix#L185
  [3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4f74d2cc85700042b/compiler/ghc/default.nix#L678-L682
  [4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4f74d2cc85700042b/compiler/ghc/default.nix#L772-L773
  

• b3c31488
  by David Feuer at 2025-08-08T15:33:21-04:00

  Add default QuasiQuoters
  
  Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier
  to write `QuasiQuoters` that give helpful error messages when they're
  used in inappropriate contexts.
  
  Closes #24434.
  

• 03555ed8
  by Sylvain Henry at 2025-08-10T22:20:57-04:00

  Handle non-fractional CmmFloats in Cmm's CBE (#26229)
  
  Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and
  Double converts float's infinity and NaN into Rational's infinity and
  NaN (respectively 1%0 and 0%0).
  
  Cmm CommonBlockEliminator hashing function needs to take these values
  into account as they can appear as literals now. See added testcase.
  

• 6c956af3
  by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00

  Fix extensions list in `DoAndIfThenElse` docs
  

• 6dc420b1
  by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00

  Document status of `RelaxedPolyRec` extension
  
  This adds a brief extension page explaining the status of the
  `RelaxedPolyRec` extension. The behaviour of this mode is already
  explained elsewhere, so this page is mainly for completeness so that
  various lists of extensions have somewhere to point to for this flag.
  
  Fixes #18630
  

• 18036d52
  by Simon Peyton Jones at 2025-08-11T11:31:20-04:00

  Take more care in zonkEqTypes on AppTy/AppTy
  
  This patch fixes #26256.
  
  See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality
  

• c8d76a29
  by Zubin Duggal at 2025-08-11T11:32:02-04:00

  ci: upgrade bootstrap compiler on windows to 9.10.1
  

• 34fc50c1
  by Ben Gamari at 2025-08-11T13:36:25-04:00

  Kill IOPort#
  
  This type is unnecessary, having been superceded by `MVar` and a rework
  of WinIO's blocking logic.
  
  See #20947.
  
  See https://github.com/haskell/core-libraries-committee/issues/213.
  

• 56b32c5a
  by sheaf at 2025-08-12T10:00:19-04:00

  Improve deep subsumption
  
  This commit improves the DeepSubsumption sub-typing implementation
  in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back
  to unification.
  
  For example, we now are properly able to prove the subtyping relationship
  
    ((∀ a. a->a) -> Int) -> Bool  <=  β[tau] Bool
  
  for an unfilled metavariable β. In this case (with an AppTy on the right),
  we used to fall back to unification. No longer: now, given that the LHS
  is a FunTy and that the RHS is a deep rho type (does not need any instantiation),
  we try to make the RHS into a FunTy, viz.
  
    β := (->) γ
  
  We can then continue using covariance & contravariance of the function
  arrow, which allows us to prove the subtyping relationship, instead of
  trying to unify which would cause us to error out with:
  
    Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int)
  
  See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.
  
  The other main improvement in this patch concerns type inference.
  The main subsumption logic happens (before & after this patch) in
  GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the
  DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode.
  
  This patch adds deep instantiation in the 'infer' mode of checkResultTy
  when we are doing deep subsumption, which allows us to accept programs
  such as:
  
    f :: Int -> (forall a. a->a)
    g :: Int -> Bool -> Bool
  
    test1 b =
      case b of
        True  -> f
        False -> g
    test2 b =
      case b of
        True  -> g
        False -> f
  
  See Note [Deeply instantiate in checkResultTy when inferring].
  
  Finally, we add representation-polymorphism checks to ensure that the
  lambda abstractions we introduce when doing subsumption obey the
  representation polymorphism invariants of Note [Representation polymorphism invariants]
  in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep].
  This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`,
  adding the equation:
  
    WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2)
  
  This is useful because mkWpFun does not introduce an eta-expansion when
  both of the argument & result wrappers are casts; so this change allows
  us to avoid introducing lambda abstractions when casts suffice.
  
  Fixes #26225
  

• d175aff8
  by Sylvain Henry at 2025-08-12T10:01:31-04:00

  Add regression test for #18619
  

• a3983a26
  by Sylvain Henry at 2025-08-12T10:02:20-04:00

  RTS: remove some TSAN annotations (#20464)
  
  Use RELAXED_LOAD_ALWAYS macro instead.
  

• 0434af81
  by Ben Gamari at 2025-08-12T10:03:02-04:00

  Bump time submodule to 1.15
  
  Also required bumps of Cabal, directory, and hpc.
  

• 62899117
  by Florian Ragwitz at 2025-08-13T21:01:34-04:00

  Extend record-selector usage ticking to all binds using a record field
  
  This extends the previous handling of ticking for RecordWildCards and
  NamedFieldPuns to all var bindings that involve record selectors.
  
  Note that certain patterns such as `Foo{foo = 42}` will currently not tick the
  `foo` selector, as ticking is triggered by `HsVar`s.
  
  Closes #26191.
  

• b37b3af7
  by Florian Ragwitz at 2025-08-13T21:01:34-04:00

  Add release notes for 9.16.1 and move description of latest HPC changes there.
  

• a5e4b7d9
  by Ben Gamari at 2025-08-13T21:02:18-04:00

  rts: Clarify rationale for undefined atomic wrappers
  
  Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared
  various atomic operation wrappers defined by ghc-internal as undefined.
  While the rationale for this isn't clear from the commit message, I
  believe that this is necessary due to the unregisterised backend.
  Specifically, the code generator will reference these symbols when
  compiling RTS Cmm sources.
  

• 50842f83
  by Andreas Klebinger at 2025-08-13T21:03:01-04:00

  Make unexpected LLVM versions a warning rather than an error.
  
  Typically a newer LLVM version *will* work so erroring out if
  a user uses a newer LLVM version is too aggressive.
  
  Fixes #25915
  

• c91e2650
  by fendor at 2025-08-13T21:03:43-04:00

  Store `StackTrace` and `StackSnapshot` in `Backtraces`
  
  Instead of decoding the stack traces when collecting the `Backtraces`,
  defer this decoding until actually showing the `Backtraces`.
  This allows users to customise how `Backtraces` are displayed by
  using a custom implementation of `displayExceptionWithInfo`, overwriting
  the default implementation for `Backtraces` (`displayBacktraces`).
  

• dee28cdd
  by fendor at 2025-08-13T21:03:43-04:00

  Allow users to customise the collection of exception annotations
  
  Add a global `CollectExceptionAnnotationMechanism` which determines how
  `ExceptionAnnotation`s are collected upon throwing an `Exception`.
  
  This API is exposed via `ghc-experimental`.
  
  By overriding how we collect `Backtraces`, we can control how the
  `Backtraces` are displayed to the user by newtyping `Backtraces` and
  giving a different instance for `ExceptionAnnotation`.
  
  A concrete use-case for this feature is allowing us to experiment with
  alternative stack decoders, without having to modify `base`, which take
  additional information from the stack frames.
  
  This commit does not modify how `Backtraces` are currently
  collected or displayed.
  

• 66024722
  by fendor at 2025-08-13T21:03:43-04:00

  Expose Backtraces internals from ghc-experimental
  
  Additionally, expose the same API `base:Control.Exception.Backtrace`
  to make it easier to use as a drop-in replacement.
  

• a766286f
  by Reed Mullanix at 2025-08-13T21:04:36-04:00

  ghc-internal: Fix naturalAndNot for NB/NS case
  
  When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the
  result:
  
  ```
  >>> naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3)
  0
  ```
  
  In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug.
  Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating.
  
  Fixes #26230
  

• 3506fa7d
  by Simon Hengel at 2025-08-13T21:05:18-04:00

  Report -pgms as a deprecated flag
  
  (instead of reporting an unspecific warning)
  
  Before:
  
      on the commandline: warning:
          Object splitting was removed in GHC 8.8
  
  After:
  
      on the commandline: warning: [GHC-53692] [-Wdeprecated-flags]
          -pgms is deprecated: Object splitting was removed in GHC 8.8
  

• 51c701fe
  by Zubin Duggal at 2025-08-13T21:06:00-04:00

  testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings
  
  The warning text is slightly different with ld.bfd.
  
  Fixes #26249
  

• dfe6f464
  by Simon Hengel at 2025-08-13T21:06:43-04:00

  Refactoring: Don't misuse `MCDiagnostic` for lint messages
  
  `MCDiagnostic` is meant to be used for compiler diagnostics.
  
  Any code that creates `MCDiagnostic` directly, without going through
  `GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json`
  (see e.g. !14475, !14492 !14548).
  
  To avoid this in the future I want to control more narrowly who creates
  `MCDiagnostic` (see #24113).
  
  Some parts of the compiler use `MCDiagnostic` purely for formatting
  purposes, without creating any real compiler diagnostics.  This change
  introduces a helper function, `formatDiagnostic`, that can be used in
  such cases instead of constructing `MCDiagnostic`.
  

• a8b2fbae
  by Teo Camarasu at 2025-08-13T21:07:24-04:00

  rts: ensure MessageBlackHole.link is always a valid closure
  
  We turn a MessageBlackHole into an StgInd in wakeBlockingQueue().
  Therefore it's important that the link field, which becomes the
  indirection field, always points to a valid closure.
  
  It's unclear whether it's currently possible for the previous behaviour
  to lead to a crash, but it's good to be consistent about this invariant nonetheless.
  
  Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>
  

• 4021181e
  by Teo Camarasu at 2025-08-13T21:07:24-04:00

  rts: spin if we see a WHITEHOLE in messageBlackHole
  
  When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK.
  GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK.
  
  This THUNK is not guaranteed to have a valid indirectee field.
  
  If at the same time, a message intended for the previous BLACKHOLE is
  processed and concurrently we BLACKHOLE the THUNK, thus temporarily
  turning it into a WHITEHOLE, we can get a segfault, since we look at the
  undefined indirectee field of the THUNK
  
  The fix is simple: spin if we see a WHITEHOLE, and it will soon be
  replaced with a valid BLACKHOLE.
  
  Resolves #26205
  

• 1107af89
  by Oleg Grenrus at 2025-08-13T21:08:06-04:00

  Allow defining HasField instances for naughty fields
  
  Resolves #26295
  
  ... as HasField solver doesn't solve for fields with "naughty"
  selectors, we could as well allow defining HasField instances for these
  fields.
  

• 020e7587
  by Sylvain Henry at 2025-08-13T21:09:00-04:00

  Fix Data.List unqualified import warning
  

• fd811ded
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Make injecting implicit bindings into its own pass
  
  Previously we were injecting "impliicit bindings" (data constructor
  worker and wrappers etc)
  
    - both at the end of CoreTidy,
    - and at the start of CorePrep
  
  This is unpleasant and confusing.  This patch puts it it its own pass,
  addImplicitBinds, which runs between the two.
  
  The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/
  TyCons, not just the ones for algebraic data types.  That change ripples
  through to
       - corePrepPgm
       - doCodeGen
       - byteCodeGen
  All take [TyCon] which includes all TyCons
  

• 9bd7fcc5
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Implement unary classes
  
  The big change is described exhaustively in
  
     Note [Unary class magic] in GHC.Core.TyCon
  
  Other changes
  
  * We never unbox class dictionaries in worker/wrapper.  This has been true for some
    time now, but the logic is now centralised in functions in
    GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg`
    See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils.
  
  * Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels.
    I can't remember if I actually changed any behaviour here, but if so it's
    only in a corner cases.
  
  * Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning
    True for (##).
  
  * Remove redundant Role argument to `liftCoSubstWithEx`.  It was always
    Representational.
  
  * I refactored evidence generation in the constraint solver:
    * Made GHC.Tc.Types.Evidence contain better abstactions for evidence
      generation.
    * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents
      elsewhere. It wasn't paying its way.
    * Made evidence for implicit parameters go via a proper abstraction.
  
  * Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk]
    This fixes a slowdown in `countdownEffectfulDynLocal`
    in the `effectful` library.
  
  Smaller things
  
  * Rename `isDataTyCon` to `isBoxedDataTyCon`.
  * GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role,
    so I baked that into the function and removed the argument.
  * Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling
    `not isNewTyCon` at the call sites; more explicit.
  * Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its
    behaviour
  * Moved `decomposeIPPred` to GHC.Core.Predicate
  
  Compile time performance changes:
    geo. mean        +0.1%
      minimum        -6.8%
      maximum       +14.4%
  
  The +14% one is in T21839c, where it seems that a bit more inlining
  is taking place.  That seems acceptable; and the average change is small
  
  Metric Decrease:
      LargeRecord
      T12227
      T12707
      T16577
      T21839r
      T5642
  Metric Increase:
      T15164
      T21839c
      T3294
      T5321FD
      T5321Fun
      WWRec
  

• b4075d71
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Slight improvement to pre/postInlineUnconditionally
  
  Avoids an extra simplifier iteration
  

• 9e443596
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Fix a long-standing assertion error in normSplitTyConApp_maybe
  

• 91310ad0
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Add comment to coercion optimiser
  

• 5b841d82
  by Teo Camarasu at 2025-08-14T17:57:56-04:00

  template-haskell: move some identifiers from ghc-internal to template-haskell
  
  These identifiers are not used internally by the compiler. Therefore we
  have no reason for them to be in ghc-internal.
  
  By moving them to template-haskell, we benefit from it being easier to
  change them and we avoid having to build them in stage0.
  
  Resolves #26048
  

• 33e2c7e5
  by Teo Camarasu at 2025-08-14T17:57:56-04:00

  template-haskell: transfer $infix note to public module
  
  This Haddock note should be in the public facing module
  

• 2a411fc4
  by Sylvain Henry at 2025-08-14T17:59:09-04:00

  JS: export HEAP8 symbol (#26290)
  
  Newer Emscripten requires this.
  

• 248f78ca
  by Ben Gamari at 2025-08-14T17:59:51-04:00

  users-guide: Drop the THREAD_RUNNABLE event
  
  As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted.

• 706d33e3
  by Recursion Ninja at 2025-08-15T04:12:12-04:00

  Resolving issues #20645 and #26109
  
  Correctly sign extending and casting smaller bit width types for LLVM operations:
  
    - bitReverse8#
    - bitReverse16#
    - bitReverse32#
    - byteSwap16#
    - byteSwap32#
    - pdep8#
    - pdep16#
    - pext8#
    - pext16#
  

• 1cdc6f46
  by Cheng Shao at 2025-08-15T04:12:56-04:00

  hadrian: enforce have_llvm=False for wasm32/js
  
  This patch fixes hadrian to always pass have_llvm=False to the
  testsuite driver for wasm32/js targets. These targets don't really
  support the LLVM backend, and the optllvm test way doesn't work. We
  used to special-case wasm32/js to avoid auto-adding optllvm way in
  testsuite/config/ghc, but this is still problematic if someone writes
  a new LLVM-related test and uses something like when(have_llvm(),
  extra_ways(["optllvm"])). So better just enforce have_llvm=False for
  these targets here.
  

• ca03226d
  by Ben Gamari at 2025-08-18T13:43:20+00:00

  configure: Allow use of LLVM 20

• 783cd7d6
  by Cheng Shao at 2025-08-18T20:13:14-04:00

  compiler: use `UniqMap` instead of `Map` for `BCEnv` in bytecode compiler
  
  The bytecode compiler maintains a `BCEnv` which was previously `Map Id
  StackDepth`. Given `Id` is `Uniquable`, we might as well use `UniqMap`
  here as a more efficient data structure, hence this patch.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 58e46da9
  by fendor at 2025-08-18T20:13:56-04:00

  rts: Strip lower three bits when hashing Word instead of lower eight bits
  

• 45dbfa23
  by Cheng Shao at 2025-08-18T20:14:37-04:00

  libffi: update to 3.5.2
  
  Bumps libffi submodule.
  

• 54be78ef
  by Ben Gamari at 2025-08-19T16:28:05-04:00

  testsuite: Fix T20006b
  
  This test is supposed to fail for non-threaded ways yet it
  was previously marked as only failing in `normal`.
  Fix this.

• f4bac607
  by Simon Peyton Jones at 2025-08-19T16:28:47-04:00

  Take yet more care with reporting redundant constraints
  
  This small patch fixes #25992, which relates to reporting redundant
  constraints on default-method declarations.
  
  See (TRC5) in Note [Tracking redundant constraints]
  

• ab130fec
  by fendor at 2025-08-19T16:29:29-04:00

  Bump dependencies of hadrian-bootstrap-gen to use GHC 9.6.7
  

• 6d02ac6f
  by fendor at 2025-08-19T16:29:29-04:00

  Bump required GHC version for test-bootstrap jobs to 9.10.1
  
  Include test-bootstrap job for GHC 9.12.2.
  
  Update hadrian bootstrap plans use GHC 9.10 and 9.12
  
  Remove older GHC bootstrap configurations.
  We require at least GHC 9.10.1 to build GHC.
  
  Adds plans for:
  
  * 9.10.1
  * 9.10.2
  * 9.12.1
  * 9.12.2
  

• 9e857171
  by Brandon Chinn at 2025-08-20T11:47:46-04:00

  Don't warn unused-imports with used generated imports
  
  Fixes #21730
  
  * The old notion of "implicit" import has been renamed to "generated". See Note [Generated imports] in GHC.Hs.ImpExp.
  
  * ImportMap now keeps track of generated and user-written imports separately. This avoids the fake SrcSpan we used to give the implicit Prelude import, and the hack that went with it.
  
  * -ddump-minimal-imports now considers generated imports (but still only
    warns on + prints user-written imports)
  
  * bestImport considers generated imports to take priority over user-written imports.
  

• 9fb3bad4
  by Ben Gamari at 2025-08-20T11:48:31-04:00

  mailmap: Use ben@well-typed.com more liberally
  
  Nearly all of this work was done while working for Well-Typed.
  

• 774fec37
  by Ben Gamari at 2025-08-20T11:49:15-04:00

  Add primop to annotate the call stack with arbitrary data
  
  We introduce a new primop `annotateStack#` which allows us to push
  arbitrary data onto the call-stack.
  This allows us to extract the data later when decoding the stack, for
  example when an exception is thrown, showing more information to the
  user without having to annotate the full call-stack with `HasCallStack`
  constraints.
  
  A new stack frame value is introduced `AnnFrame`, which consists of
  nothing but a generic payload.
  
  The primop has a small wrapper API that allows users to annotate their
  call-stack in programs.
  There is a pure API and an IO-based one. The former is a little bit
  dubious, as it affects the evaluation of a program, so use with care.
  The latter is "safe", as it doesn't change the evaluation of the
  program.
  
  The stack annotation mechanism is similarly implemented to the
  `ExceptionAnnotation` and `Exception`, there is a typeclass to indicate
  something can be pushed onto the call-stack and all values are wrapped
  in the existential `SomeStackAnnotation`, which recover the type of the
  annotation payload.
  
  There is currently no builtin way to show the stack annotations when
  `Backtraces` are displayed (i.e., when showing stack traces to the user),
  which we will address in a follow-up MR.
  
  -------------------------
  Metric Increase:
      ghc_experimental_so
  -------------------------
  
  We increase the size of the package, so this is not unreasonable.
  
  Co-Authored-By: fendor <fendor@posteo.de>
  Co-Authored-By: Ben Gamari <bgamari.foss@gmail.com>
  

• fdfa3892
  by Ben Gamari at 2025-08-20T11:49:57-04:00

  testsuite: Add regression test for #24606
  

• 39b2e382
  by Cheng Shao at 2025-08-20T11:50:40-04:00

  compiler: only use `Name` instead of `Id` in `SptEntry`
  
  As a part of #26298, this patch refactors `SptEntry` to only carry a
  `Name` instead of `Id`: we do not care about extra information like
  caffyness or type at all in any static pointer related codegen logic.
  This is necessary to make `SptEntry` serializable, as a part of the
  grand plan of serializable bytecode.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 276f8ea8
  by Vekhir -- at 2025-08-20T11:51:35-04:00

  Bump Cabal dependency

• 0b9c7437
  by Zubin Duggal at 2025-08-20T11:52:18-04:00

  ci: Teach ci.sh to fetch FreeBSD artifacts from ghcup unofficial bindists and bootstrap compiler on FreeBSD to 9.10.1
  
  Also refactor fetch_ghc logic in ci.sh, renaming the GHC_VERSION enviorment configuration variable to FETCH_GHC_VERSION,
  making it clear that it is intended for use on platforms like Windows and FreeBSD where we don't want to use the GHC
  excecutable from the platform environment and instead need to download and install GHC-$FETCH_GHC_VERSION from a release
  bindist.
  
  Fixes #26296
  

• b2914797
  by Cheng Shao at 2025-08-20T11:53:00-04:00

  driver: use UniqSet for hiddenModules in DynFlags/FinderOpts
  
  This patch replaces Set ModuleName with UniqSet ModuleName in
  DynFlags.hiddenModules and FinderOpts.finder_hiddenModules for
  improved efficiency.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 0335d899
  by Cheng Shao at 2025-08-20T11:53:00-04:00

  driver: use UniqMap ModuleName in the finder
  
  This patch replaces Map ModuleName with UniqMap ModuleName in the
  finder for improved efficiency.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 91f4faaa
  by Cheng Shao at 2025-08-20T11:53:43-04:00

  configure: check python3 version and require minimal 3.7
  
  Since !9515, the testsuite driver requires python3 version to be at
  least 3.7, though this has never been checked by configure logic. This
  patch implements the version check. Fixes #23234.
  
  Co-authored-by: Codex <codex@openai.com>
  

• df4ee9b4
  by Cheng Shao at 2025-08-20T11:54:25-04:00

  compiler: use zero cost coerce in GHC.CmmToAsm.CFG.loopInfo
  
  This patch refactors GHC.CmmToAsm.CFG.loopInfo to use zero cost coerce
  and thus addresses the TODO. For coerce to work, constructors of
  Label/LabelMap/LabelSet from GHC.Cmm.Dataflow.Label are exposed,
  though I believe it's a worthy tradeoff to avoid unnecessary runtime
  cost without using unsafeCoerce, since the latter could be a landmine
  for future refactoring.
  
  Co-authored-by: Codex <codex@openai.com>
  

• ccda188d
  by Simon Peyton Jones at 2025-08-20T11:55:07-04:00

  Start with empty inerts in shortcut solving
  
  When short-cut solving we were starting with an inert set that had
  unsolved Wanteds.  This caused an infinite loop (#26314), because a
  typechecker plugin kept being given that unsolved Wanted.
  
  It's better just to start with an empty inert set
  

• c8882ed7
  by Ben Gamari at 2025-08-20T11:55:49-04:00

  configure: Bump minimal bootstrap GHC version to 9.8

• f0a19d74
  by fendor at 2025-08-20T19:55:00-04:00

  Remove deprecated functions from the ghci package
  

• ebeb991b
  by fendor at 2025-08-20T19:55:00-04:00

  base: Remove unstable heap representation details from GHC.Exts
  

• e368e247
  by Rodrigo Mesquita at 2025-08-20T19:55:42-04:00

  bytecode: Use 32bits for breakpoint index
  
  Fixes #26325
  

• 42724462
  by Simon Hengel at 2025-08-21T17:52:11-04:00

  Serialize wired-in names as external names when creating HIE files
  
  Note that the domain of de-serialized names stays the same.
  Specifically, for known-key names, before `lookupKnownKeyName` was used,
  while now this is handled by `lookupOrigNameCache` which captures the
  same range provided that the OrigNameCache has been initialized with
  `knownKeyNames` (which is the case by default).
  
  (fixes #26238)
  

• 6a43f8ec
  by Cheng Shao at 2025-08-21T17:52:52-04:00

  compiler: fix closure C type in SPT init code
  
  This patch fixes the closure C type in SPT init code to StgClosure,
  instead of the previously incorrect StgPtr. Having an incorrect C type
  makes SPT init code not compatible with other foreign stub generation
  logic, which may also emit their own extern declarations for the same
  closure symbols and thus will clash with the incorrect prototypes in
  SPT init code.
  

• 5b5d9d47
  by Ben Gamari at 2025-08-25T14:29:35-04:00

  Revert "STM: don't create a transaction in the rhs of catchRetry# (#26028)"
  
  This reverts commit 0a5836891ca29836a24c306d2a364c2e4b5377fd

• 10f06163
  by Cheng Shao at 2025-08-25T14:30:16-04:00

  wasm: ensure setKeepCAFs() is called in ghci
  
  This patch is a critical bugfix for #26106, see comment and linked
  issue for details.
  

• bedc1004
  by Cheng Shao at 2025-08-26T09:31:18-04:00

  compiler: use zero cost coerce in hoopl setElems/mapToList
  
  This patch is a follow-up of !14680 and changes setElems/mapToList in
  GHC/Cmm/Dataflow/Label to use coerce instead of mapping mkHooplLabel
  over the keys.
  

• 13250d97
  by Ryan Scott at 2025-08-26T09:31:59-04:00

  Reject infix promoted data constructors without DataKinds
  
  In the rename, make sure to apply the same `DataKinds` checks for both
  `HsTyVar` (for prefix promoted data constructors) and `HsOpTy` (for infix
  promoted data constructors) alike.
  
  Fixes #26318.
  

• 37655c46
  by Teo Camarasu at 2025-08-26T15:24:51-04:00

  tests: disable T22859 under LLVM
  
  This test was failing under the LLVM backend since the allocations
  differ from the NCG.
  
  Resolves #26282
  

• 2cbba9d6
  by Teo Camarasu at 2025-08-26T15:25:33-04:00

  base-exports: update version numbers
  
  As the version of the compiler has been bumped, a lot of the embedded
  version numbers will need to be updated if we ever run this test with
  `--test-accept` so let's just update them now, and keep future diffs
  clean.
  

• f9f2ffcf
  by Alexandre Esteves at 2025-08-27T07:19:14-04:00

  Import new name for 'utimbuf' on windows to fix #26337
  
  Fixes an `-Wincompatible-pointer-types` instance that turns into an error on
  recent toolchains and surfaced as such on nixpkgs when doing linux->ucrt cross.
  
  This long-standing warning has been present at least since 9.4:
  
  ```
  C:\GitLabRunner\builds\0\1709189\tmp\ghc16652_0\ghc_4.c:26:115: error:
       warning: incompatible pointer types passing 'struct utimbuf *' to parameter of type 'struct _utimbuf *' [-Wincompatible-pointer-types]
     |
  26 | HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}
  
     |                                                                                                                   ^
  HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}
                                                                                                                    ^~
  
  C:\GitLabRunner\builds\0\1709189\_build\stage0\lib\..\..\mingw\x86_64-w64-mingw32\include\sys\utime.h:109:72: error:
       note: passing argument to parameter '_Utimbuf' here
      |
  109 | __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
      |                                                                        ^
  __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
  ```
  

• ae89f000
  by Hassan Al-Awwadi at 2025-08-27T07:19:56-04:00

  Adds the fucnction addDependentDirectory to Q, resolving issue #26148.
  
  This function adds a new directory to the list of things a module depends upon. That means that when the contents of the directory change, the recompilation checker will notice this and the module will be recompiled. Documentation has also been added for addDependentFunction and addDependentDirectory in the user guide.
  

• 00478944
  by Simon Peyton Jones at 2025-08-27T16:48:30+01:00

  Comments only
  

• a7884589
  by Simon Peyton Jones at 2025-08-28T11:08:23+01:00

  Type-family occurs check in unification
  
  The occurs check in `GHC.Core.Unify.uVarOrFam` was inadequate in dealing
  with type families.
  
  Better now.  See Note [The occurs check in the Core unifier].
  
  As I did this I realised that the whole apartness thing is trickier than I
  thought: see the new Note [Shortcomings of the apartness test]
  

• 8adfc222
  by sheaf at 2025-08-28T19:47:17-04:00

  Fix orientation in HsWrapper composition (<.>)
  
  This commit fixes the order in which WpCast HsWrappers are composed,
  fixing a bug introduced in commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1.
  
  Fixes #26350
  

• eb2ab1e2
  by Oleg Grenrus at 2025-08-29T11:00:53-04:00

  Generalise thNameToGhcName by adding HasHscEnv
  
  There were multiple single monad-specific `getHscEnv` across codebase.
  HasHscEnv is modelled on HasDynFlags.
  
  My first idea was to simply add thNameToGhcNameHsc and
  thNameToGhcNameTc, but those would been exactly the same
  as thNameToGhcName already.
  
  Also add an usage example to thNameToGhcName and mention that it's
  recommended way of looking up names in GHC plugins
  

• 2d575a7f
  by fendor at 2025-08-29T11:01:36-04:00

  configure: Bump minimal bootstrap GHC version to 9.10
  

• 716274a5
  by Simon Peyton Jones at 2025-08-29T17:27:12-04:00

  Fix deep subsumption again
  
  This commit fixed #26255:
  
      commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1
      Author: sheaf <sam.derbyshire@gmail.com>
      Date:   Mon Aug 11 15:50:47 2025 +0200
  
          Improve deep subsumption
  
          This commit improves the DeepSubsumption sub-typing implementation
          in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back
          to unification.
  
  But alas it still wasn't quite right for view patterns: #26331
  
  This MR does a generalisation to fix it.  A bit of a sledgehammer to crack
  a nut, but nice.
  
  * Add a field `ir_inst :: InferInstFlag` to `InferResult`, where
    ```
    data InferInstFlag = IIF_Sigma | IIF_ShallowRho | IIF_DeepRho
    ```
  
  * The flag says exactly how much `fillInferResult` should instantiate
    before filling the hole.
  
  * We can also use this to replace the previous very ad-hoc `tcInferSigma`
    that was used to implement GHCi's `:type` command.
  

• 27206c5e
  by sheaf at 2025-08-29T17:28:14-04:00

  Back-compat for TH SpecialiseP data-con of Pragma
  
  This commit improves the backwards-compatibility story for the
  SpecialiseP constructor of the Template Haskell 'Pragma' datatype.
  
  Instead of keeping the constructor but deprecating it, this commit makes
  it into a bundled pattern synonym of the Pragma datatype. We no longer
  deprecate it; it's useful for handling old-form specialise pragmas.
  

• 26dbcf61
  by fendor at 2025-08-30T05:10:08-04:00

  Move stack decoding logic from ghc-heap to ghc-internal
  
  The stack decoding logic in `ghc-heap` is more sophisticated than the one
  currently employed in `CloneStack`. We want to use the stack decoding
  implementation from `ghc-heap` in `base`.
  We cannot simply depend on `ghc-heap` in `base` due do bootstrapping
  issues.
  Thus, we move the code that is necessary to implement stack decoding to
  `ghc-internal`. This is the right location, as we don't want to add a
  new API to `base`.
  
  Moving the stack decoding logic and re-exposing it in ghc-heap is
  insufficient, though, as we have a dependency cycle between.
  
  * ghc-heap depends on stage1:ghc-internal
  * stage0:ghc depends on stage0:ghc-heap
  
  To fix this, we remove ghc-heap from the set of `stage0` dependencies.
  
  This is not entirely straight-forward, as a couple of boot dependencies,
  such as `ghci` depend on `ghc-heap`.
  Luckily, the boot compiler of GHC is now >=9.10, so we can migrate `ghci`
  to use `ghc-internal` instead of `ghc-heap`, which already exports the
  relevant modules.
  
  However, we cannot 100% remove ghc's dependency on `ghc-heap`, since
  when we compile `stage0:ghc`, `stage1:ghc-internal` is not yet
  available.
  Thus, when we compile with the boot-compiler, we still depend on an
  older version of `ghc-heap`, and only use the modules from `ghc-internal`,
  if the `ghc-internal` version is recent enough.
  
  -------------------------
  Metric Increase:
      T24602_perf_size
      T25046_perf_size_gzip
      T25046_perf_size_unicode
      T25046_perf_size_unicode_gzip
      size_hello_artifact
      size_hello_artifact_gzip
      size_hello_unicode
      size_hello_unicode_gzip
  -------------------------
  
  These metric increases are unfortunate, they are most likely caused by
  the larger (literally in terms of lines of code) stack decoder implementation
  that are now linked into hello-word binaries.
  
  On linux, it is almost a 10% increase, which is considerable.
  

• bd80bb70
  by fendor at 2025-08-30T05:10:08-04:00

  Implement `decode` in terms of `decodeStackWithIpe`
  
  Uses the more efficient stack decoder implementation.
  

• 24441165
  by fendor at 2025-08-30T05:10:08-04:00

  Remove stg_decodeStackzh
  

• fb9cc882
  by Simon Peyton Jones at 2025-08-30T05:10:51-04:00

  Fix a long standing bug in the coercion optimiser
  
  We were mis-optimising ForAllCo, leading to #26345
  
  Part of the poblem was the tricky tower of abstractions leading to
  the dreadful
     GHC.Core.TyCo.Subst.substForAllCoTyVarBndrUsing
  This function was serving two masters: regular substitution, but also
  coercion optimsation.  So tricky was it that it did so wrong.
  
  In this MR I locate all the fancy footwork for coercion optimisation
  in GHC.Core.Coercion.Opt, where it belongs.   That leaves substitution
  free to be much simpler.
  

• 6c78de2d
  by Sylvain Henry at 2025-09-01T08:46:19-04:00

  Driver: substitute virtual Prim module in --make mode too
  
  When we build ghc-internal with --make (e.g. with cabal-install), we
  need to be careful to substitute the virtual interface file for
  GHC.Internal.Prim:
  - after code generation (we generate code for an empty module, so we get
    an empty interface)
  - when we try to reload its .hi file
  

• 26e0db16
  by fendor at 2025-09-01T08:47:01-04:00

  Expose Stack Annotation frames in IPE backtraces by default
  
  When decoding the Haskell-native call stack and displaying the IPE information
  for the stack frames, we print the `StackAnnotation` of the `AnnFrame` by default.
  
  This means, when an exception is thrown, any intermediate stack annotations will
  be displayed in the `IPE Backtrace`.
  
  Example backtrace:
  ```
  Exception: ghc-internal:GHC.Internal.Exception.ErrorCall:
  
  Oh no!
  
  IPE backtrace:
    annotateCallStackIO, called at app/Main.hs:48:10 in backtrace-0.1.0.0-inplace-server:Main
    annotateCallStackIO, called at app/Main.hs:46:13 in backtrace-0.1.0.0-inplace-server:Main
    Main.handler (app/Main.hs:(46,1)-(49,30))
    Main.liftIO (src/Servant/Server/Internal/Handler.hs:30:36-42)
    Servant.Server.Internal.Delayed.runHandler' (src/Servant/Server/Internal/Handler.hs:27:31-41)
    Control.Monad.Trans.Resource.runResourceT (./Control/Monad/Trans/Resource.hs:(192,14)-(197,18))
    Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:195:20-22)
    Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:(195,5)-(203,31))
    Network.Wai.Handler.Warp.HTTP1.http1server.loop (./Network/Wai/Handler/Warp/HTTP1.hs:(141,9)-(157,42))
  HasCallStack backtrace:
    error, called at app/Main.hs:48:32 in backtrace-0.1.0.0-inplace-server:Main
  ```
  
  The first two entries have been added by `annotateCallStackIO`, defined in `annotateCallStackIO`.
  

• a1567efd
  by Sylvain Henry at 2025-09-01T23:01:35-04:00

  RTS: rely less on Hadrian for flag setting (#25843)
  
  Hadrian used to pass -Dfoo command-line flags directly to build the rts.
  We can replace most of these flags with CPP based on cabal flags.
  It makes building boot libraries with cabal-install simpler (cf #25843).
  

• ca5b0283
  by Sergey Vinokurov at 2025-09-01T23:02:23-04:00

  Remove unnecessary irrefutable patterns from Bifunctor instances for tuples
  
  Implementation of https://github.com/haskell/core-libraries-committee/issues/339
  
  Metric Decrease:
      mhu-perf
  

• 2da84b7a
  by sheaf at 2025-09-01T23:03:23-04:00

  Only use active rules when simplifying rule RHSs
  
  When we are simplifying the RHS of a rule, we make sure to only apply
  rewrites from rules that are active throughout the original rule's
  range of active phases.
  
  For example, if a rule is always active, we only fire rules that are
  themselves always active when simplifying the RHS. Ditto for inline
  activations.
  
  This is achieved by setting the simplifier phase to a range of phases,
  using the new SimplPhaseRange constructor. Then:
  
    1. When simplifying the RHS of a rule, or of a stable unfolding,
       we set the simplifier phase to a range of phases, computed from
       the activation of the RULE/unfolding activation, using the
       function 'phaseFromActivation'.
  
       The details are explained in Note [What is active in the RHS of a RULE?]
       in GHC.Core.Opt.Simplify.Utils.
  
    2. The activation check for other rules and inlinings is then:
       does the activation of the other rule/inlining cover the whole
       phase range set in sm_phase? This continues to use the 'isActive'
       function, which now accounts for phase ranges.
  
  On the way, this commit also moves the exact-print SourceText annotation
  from the Activation datatype to the ActivationAnn type. This keeps the
  main Activation datatype free of any extra cruft.
  
  Fixes #26323
  

• 79816cc4
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  cleanup: Move dehydrateCgBreakInfo to Stg2Bc
  
  This no longer has anything to do with Core.
  

• 53da94ff
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  rts/Disassembler: Fix spacing of BRK_FUN
  

• 08c0cf85
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  debugger: Fix bciPtr in Step-out
  
  We need to use `BCO_NEXT` to move bciPtr to ix=1, because ix=0 points to
  the instruction itself!
  
  I do not understand how this didn't crash before.
  

• e7e021fa
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  debugger: Allow BRK_FUNs to head case continuation BCOs
  
  When we start executing a BCO, we may want to yield to the scheduler:
  this may be triggered by a heap/stack check, context switch, or a
  breakpoint. To yield, we need to put the stack in a state such that
  when execution is resumed we are back to where we yielded from.
  
  Previously, a BKR_FUN could only head a function BCO because we only
  knew how to construct a valid stack for yielding from one -- simply add
  `apply_interp_info` + the BCO to resume executing. This is valid because
  the stack at the start of run_BCO is headed by that BCO's arguments.
  
  However, in case continuation BCOs (as per Note [Case continuation BCOs]),
  we couldn't easily reconstruct a valid stack that could be resumed
  because we dropped too soon the stack frames regarding the value
  returned (stg_ret) and received (stg_ctoi) by that continuation.
  This is especially tricky because of the variable type and size return
  frames (e.g. pointer ret_p/ctoi_R1p vs a tuple ret_t/ctoi_t2).
  
  The trick to being able to yield from a BRK_FUN at the start of a case
  cont BCO is to stop removing the ret frame headers eagerly and instead
  keep them until the BCO starts executing. The new layout at the start of
  a case cont. BCO is described by the new Note [Stack layout when entering run_BCO].
  
  Now, we keep the ret_* and ctoi_* frames when entering run_BCO.
  A BRK_FUN is then executed if found, and the stack is yielded as-is with
  the preserved ret and ctoi frames.
  Then, a case cont BCO's instructions always SLIDE off the headers of the
  ret and ctoi frames, in StgToByteCode.doCase, turning a stack like
  
     |     ....      |
     +---------------+
     |     fv2       |
     +---------------+
     |     fv1       |
     +---------------+
     |     BCO       |
     +---------------+
     | stg_ctoi_ret_ |
     +---------------+
     |    retval     |
     +---------------+
     | stg_ret_..... |
     +---------------+
  
  into
  
     |     ....      |
     +---------------+
     |     fv2       |
     +---------------+
     |     fv1       |
     +---------------+
     |    retval     |
     +---------------+
  
  for the remainder of the BCO.
  
  Moreover, this more uniform approach of keeping the ret and ctoi frames
  means we need less ad-hoc logic concerning the variable size of
  ret_tuple vs ret_p/np frames in the code generator and interpreter:
  Always keep the return to cont. stack intact at the start of run_BCO,
  and the statically generated instructions will take care of adjusting
  it.
  
  Unlocks BRK_FUNs at the start of case cont. BCOs which will enable a
  better user-facing step-out (#26042) which is free of the bugs the
  current BRK_ALTS implementation suffers from (namely, using BRK_FUN
  rather than BRK_ALTS in a case cont. means we'll never accidentally end
  up in a breakpoint "deeper" than the continuation, because we stop at
  the case cont itself rather than on the first breakpoint we evaluate
  after it).
  

• ade3c1e6
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  BRK_FUN with InternalBreakLocs for code-generation time breakpoints
  
  At the start of a case continuation BCO, place a BRK_FUN.
  This BRK_FUN uses the new "internal breakpoint location" -- allowing us
  to come up with a valid source location for this breakpoint that is not associated with a source-level tick.
  
  For case continuation BCOs, we use the last tick seen before it as the
  source location. The reasoning is described in Note [Debugger: Stepout internal break locs].
  
  Note how T26042c, which was broken because it displayed the incorrect
  behavior of the previous step out when we'd end up at a deeper level
  than the one from which we initiated step-out, is now fixed.
  
  As of this commit, BRK_ALTS is now dead code and is thus dropped.
  
  Note [Debugger: Stepout internal break locs]
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Step-out tells the interpreter to run until the current function
  returns to where it was called from, and stop there.
  
  This is achieved by enabling the BRK_FUN found on the first RET_BCO
  frame on the stack (See [Note Debugger: Step-out]).
  
  Case continuation BCOs (which select an alternative branch) must
  therefore be headed by a BRK_FUN. An example:
  
      f x = case g x of <--- end up here
          1 -> ...
          2 -> ...
  
      g y = ... <--- step out from here
  
  - `g` will return a value to the case continuation BCO in `f`
  - The case continuation BCO will receive the value returned from g
  - Match on it and push the alternative continuation for that branch
  - And then enter that alternative.
  
  If we step-out of `g`, the first RET_BCO on the stack is the case
  continuation of `f` -- execution should stop at its start, before
  selecting an alternative. (One might ask, "why not enable the breakpoint
  in the alternative instead?", because the alternative continuation is
  only pushed to the stack *after* it is selected by the case cont. BCO)
  
  However, the case cont. BCO is not associated with any source-level
  tick, it is merely the glue code which selects alternatives which do
  have source level ticks. Therefore, we have to come up at code
  generation time with a breakpoint location ('InternalBreakLoc') to
  display to the user when it is stopped there.
  
  Our solution is to use the last tick seen just before reaching the case
  continuation. This is robust because a case continuation will thus
  always have a relevant breakpoint location:
  
      - The source location will be the last source-relevant expression
        executed before the continuation is pushed
  
      - So the source location will point to the thing you've just stepped
        out of
  
      - Doing :step-local from there will put you on the selected
        alternative (which at the source level may also be the e.g. next
        line in a do-block)
  
  Examples, using angle brackets (<<...>>) to denote the breakpoint span:
  
      f x = case <<g x>> {- step in here -} of
          1 -> ...
          2 -> ...>
  
      g y = <<...>> <--- step out from here
  
      ...
  
      f x = <<case g x of <--- end up here, whole case highlighted
          1 -> ...
          2 -> ...>>
  
      doing :step-local ...
  
      f x = case g x of
          1 -> <<...>> <--- stop in the alternative
          2 -> ...
  
  A second example based on T26042d2, where the source is a do-block IO
  action, optimised to a chain of `case expressions`.
  
      main = do
        putStrLn "hello1"
        <<f>> <--- step-in here
        putStrLn "hello3"
        putStrLn "hello4"
  
      f = do
        <<putStrLn "hello2.1">> <--- step-out from here
        putStrLn "hello2.2"
  
      ...
  
      main = do
        putStrLn "hello1"
        <<f>> <--- end up here again, the previously executed expression
        putStrLn "hello3"
        putStrLn "hello4"
  
      doing step/step-local ...
  
      main = do
        putStrLn "hello1"
        f
        <<putStrLn "hello3">> <--- straight to the next line
        putStrLn "hello4"
  
  Finishes #26042
  

• c66910c0
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  debugger: Re-use the last BreakpointId whole in step-out
  
  Previously, to come up with a location to stop at for `:stepout`, we
  would store the location of the last BreakpointId surrounding the
  continuation, as described by Note [Debugger: Stepout internal break locs].
  
  However, re-using just the location from the last source breakpoint
  isn't sufficient to provide the necessary information in the break
  location. Specifically, it wouldn't bind any variables at that location.
  
  Really, there is no reason not to re-use the last breakpoint wholesale,
  and re-use all the information we had there. Step-out should behave just
  as if we had stopped at the call, but s.t. continuing will not
  re-execute the call.
  
  This commit updates the CgBreakInfo to always store a BreakpointId, be
  it the original one or the one we're emulating (for step-out).
  
  It makes variable bindings on :stepout work
  

• e4abed7b
  by sheaf at 2025-09-02T12:20:40-04:00

  Revert accidental changes to hie.yaml

• 003b715b
  by meooow25 at 2025-09-02T23:48:51+02:00

  Adjust the strictness of Data.List.iterate'
  
  * Don't force the next element in advance when generating a (:).
  * Force the first element to WHNF like every other element.
  
  Now every element in the output list is forced to WHNF when the (:)
  containing it is forced.
  
  CLC proposal:
  https://github.com/haskell/core-libraries-committee/issues/335
  

• b2f6aad0
  by Simon Hengel at 2025-09-03T04:36:10-04:00

  Refactoring: More consistently use logOutput, logInfo, fatalErrorMsg
  

• 60a16db7
  by Rodrigo Mesquita at 2025-09-03T10:55:50+01:00

  bytecode: Don't PUSH_L 0; SLIDE 1 1
  
  While looking through bytecode I noticed a quite common unfortunate
  pattern:
  
  ...
  PUSH_L 0
  SLIDE 1 1
  
  We do this often by generically constructing a tail call from a function
  atom that may be somewhere arbitrary on the stack.
  However, for the special case that the function can be found directly on
  top of the stack, as part of the arguments, it's plain redundant to push
  then slide it.
  
  In this commit we add a small optimisation to the generation of
  tailcalls in bytecode. Simply: lookahead for the function in the stack.
  If it is the first thing on the stack and it is part of the arguments
  which would be dropped as we entered the tail call, then don't push then
  slide it.
  
  In a simple example (T26042b), this already produced a drastic
  improvement in generated code (left is old, right is with this patch):
  
  ```diff
  3c3
  < 2025-07-29 10:14:02.081277 UTC
  ---
  > 2025-07-29 10:50:36.560949 UTC
  160,161c160
  <                                            PUSH_L   0
  <                                            SLIDE    1 2
  ---
  >                                            SLIDE    1 1
  164,165d162
  <                                       PUSH_L   0
  <                                       SLIDE    1 1
  175,176c172
  <                             PUSH_L   0
  <                             SLIDE    1 2
  ---
  >                             SLIDE    1 1
  179,180d174
  <                        PUSH_L   0
  <                        SLIDE    1 1
  206,207d199
  <                        PUSH_L   0
  <                        SLIDE    1 1
  210,211d201
  <                   PUSH_L   0
  <                   SLIDE    1 1
  214,215d203
  <              PUSH_L   0
  <              SLIDE    1 1
  218,219d205
  <         PUSH_L   0
  <         SLIDE    1 1
  222,223d207
  <    PUSH_L   0
  <    SLIDE    1 1
  ...
  600,601c566
  <                                                 PUSH_L   0
  <                                                 SLIDE    1 2
  ---
  >                                                 SLIDE    1 1
  604,605d568
  <                                            PUSH_L   0
  <                                            SLIDE    1 1
  632,633d594
  <                                            PUSH_L   0
  <                                            SLIDE    1 1
  636,637d596
  <                                       PUSH_L   0
  <                                       SLIDE    1 1
  640,641d598
  <                                  PUSH_L   0
  <                                  SLIDE    1 1
  644,645d600
  <                             PUSH_L   0
  <                             SLIDE    1 1
  648,649d602
  <                        PUSH_L   0
  <                        SLIDE    1 1
  652,653d604
  <                   PUSH_L   0
  <                   SLIDE    1 1
  656,657d606
  <              PUSH_L   0
  <              SLIDE    1 1
  660,661d608
  <         PUSH_L   0
  <         SLIDE    1 1
  664,665d610
  <    PUSH_L   0
  <    SLIDE    1 1
  ```
  
  I also compiled lib:Cabal to bytecode and counted the number of bytecode
  lines with `find dist-newstyle -name "*.dump-BCOs" -exec wc {} +`:
  
      with unoptimized core:
      1190689 lines (before) - 1172891 lines (now)
      = 17798 less redundant instructions (-1.5% lines)
  
      with optimized core:
      1924818 lines (before) - 1864836 lines (now)
      = 59982 less redundant instructions (-3.1% lines)
  

• 8b2c72c0
  by L0neGamer at 2025-09-04T06:32:03-04:00

  Add Control.Monad.thenM and Control.Applicative.thenA
  

• 39e1b7cb
  by Teo Camarasu at 2025-09-04T06:32:46-04:00

  ghc-internal: invert dependency of GHC.Internal.TH.Syntax on Data.Data
  
  This means that Data.Data no longer blocks building TH.Syntax, which
  allows greater parallelism in our builds.
  
  We move the Data.Data.Data instances to Data.Data. Quasi depends on
  Data.Data for one of its methods, so,
  we split the Quasi/Q, etc definition out of GHC.Internal.TH.Syntax
  into its own module. This has the added benefit of splitting up this
  quite large module.
  
  Previously TH.Syntax was a bottleneck when compiling ghc-internal. Now
  it is less of a bottle-neck and is also slightly quicker to
  compile (since it no longer contains these instances) at the cost of
  making Data.Data slightly more expensive to compile.
  TH.Lift which depends on TH.Syntax can also compile quicker and no
  longer blocks ghc-internal finishing to compile.
  
  Resolves #26217
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_OneShot
      T13253
      T21839c
      T24471
  Metric Increase:
      T12227
  -------------------------
  

• bdf82fd2
  by Teo Camarasu at 2025-09-04T06:32:46-04:00

  compiler: delete unused names in Builtins.Names.TH
  
  returnQ and bindQ are no longer used in the compiler.
  There was also a very old comment that referred to them that I have modernized
  

• 41a448e5
  by Ben Gamari at 2025-09-04T19:21:43-04:00

  hadrian: Pass lib & include directories to ghc `Setup configure`
  

• 46bb9a79
  by Ben Gamari at 2025-09-04T19:21:44-04:00

  rts/IPE: Fix compilation when zstd is enabled
  
  This was broken by the refactoring undertaken in
  c80dd91c0bf6ac034f0c592f16c548b9408a8481.
  
  Closes #26312.
  

• 138a6e34
  by sheaf at 2025-09-04T19:22:46-04:00

  Make mkCast assertion a bit clearer
  
  This commit changes the assertion message that gets printed when one
  calls mkCast with a coercion whose kind does not match the type of the
  inner expression. I always found the assertion message a bit confusing,
  as it didn't clearly state what exactly was the error.
  

• 9d626be1
  by sheaf at 2025-09-04T19:22:46-04:00

  Simplifier/rules: fix mistakes in Notes & comments
  

• 94b62aa7
  by Simon Peyton Jones at 2025-09-08T03:37:14-04:00

  Refactor ForAllCo
  
  This is a pure refactor, addressing #26389.
  
  It arranges that the kind coercion in a ForAllCo is a MCoercion, rather
  than a plain Coercion, thus removing redundancy in the common case.
  See (FC8) in Note [ForAllCo]
  
  It's a nice cleanup.
  

• 624afa4a
  by sheaf at 2025-09-08T03:38:05-04:00

  Use tcMkScaledFunTys in matchExpectedFunTys
  
  We should use tcMkScaledFunTys rather than mkScaledFunTys in
  GHC.Tc.Utils.Unify.matchExpectedFunTys, as the latter crashes
  when the kind of the result type is a bare metavariable.
  We know the result is always Type-like, so we don't need scaledFunTys
  to try to rediscover that from the kind.
  
  Fixes #26277
  

• 0975d2b6
  by sheaf at 2025-09-08T03:38:54-04:00

  Revert "Remove hptAllFamInstances usage during upsweep"
  
  This reverts commit 3bf6720eff5e86e673568e756161e6d6150eb440.
  

• 0cf34176
  by soulomoon at 2025-09-08T03:38:54-04:00

  Family consistency checks: add test for #26154
  
  This commit adds the test T26154, to make sure that GHC doesn't crash
  when performing type family consistency checks. This test case
  was extracted from Agda.
  
  Fixes #26154
  

• ba210d98
  by Simon Peyton Jones at 2025-09-08T16:26:36+01:00

  Report solid equality errors before custom errors
  
  This MR fixes #26255 by
  
  * Reporting solid equality errors like
       Int ~ Bool
    before "custom type errors".  See comments in `report1` in
    `reportWanteds`
  
  * Suppressing errors that arise from superclasses of
    Wanteds.  See (SCE1) in Note [Suppressing confusing errors]
  
  More details in #26255.
  

• b6249140
  by Simon Peyton Jones at 2025-09-10T10:42:38-04:00

  Fix a scoping error in Specialise
  
  This small patch fixes #26329, which triggered a scoping error.
  
  Test is in T21391, with -fpolymorphic-specialisation enabled
  

• 45305ab8
  by sheaf at 2025-09-10T10:43:29-04:00

  Make rationalTo{Float,Double} inline in phase 0
  
  We hold off on inlining these until phase 0 to allow constant-folding
  rules to fire. However, once we get to phase 0, we should inline them,
  e.g. to expose unboxing opportunities.
  
  See CLC proposal #356.
  

• 0959d4bc
  by Andreas Klebinger at 2025-09-10T10:44:12-04:00

  Add regression test for #26056
  

• dc79593d
  by sheaf at 2025-09-10T10:45:01-04:00

  Deep subsumption: unify mults without tcEqMult
  
  As seen in #26332, we may well end up with a non-reflexive multiplicity
  coercion when doing deep subsumption. We should do the same thing that
  we do without deep subsumption: unify the multiplicities normally,
  without requiring that the coercion is reflexive (which is what
  'tcEqMult' was doing).
  
  Fixes #26332
  

• 4bfe2269
  by sheaf at 2025-09-10T10:45:50-04:00

  lint-codes: fixup MSYS drive letter on Windows
  
  This change ensures that System.Directory.listDirectory doesn't trip up
  on an MSYS-style path like '/c/Foo' when trying to list all testsuite
  stdout/stderr files as required for testing coverage of GHC diagnostic
  codes in the testsuite.
  
  Fixes #25178
  

• 56540775
  by Ben Gamari at 2025-09-10T10:46:32-04:00

  gitlab-ci: Disable split sections on FreeBSD
  
  Due to #26303.
  

• 1537784b
  by Moritz Angermann at 2025-09-10T10:47:13-04:00

  Improve mach-o relocation information
  
  This change adds more information about the symbol and addresses
  we try to relocate in the linker.  This significantly helps when
  deubbging relocation issues reported by users.
  

• 4e67855b
  by Moritz Angermann at 2025-09-10T10:47:54-04:00

  test.mk expect GhcLeadingUnderscore, not LeadingUnderscore (in line with the other Ghc prefixed variables.
  

• c1cdd265
  by Moritz Angermann at 2025-09-10T10:48:35-04:00

  testsuite: Fix broken exec_signals_child.c
  
  There is no signal 0. The signal mask is 1-32.
  

• 99ac335c
  by Moritz Angermann at 2025-09-10T10:49:15-04:00

  testsuite: clarify Windows/Darwin locale rationale for skipping T6037 T2507 T8959a
  

• 0e8fa77a
  by Moritz Angermann at 2025-09-10T10:49:56-04:00

  Skip broken tests on macOS (due to leading underscore not handled properly in the expected output.)
  

• 28570c59
  by Zubin Duggal at 2025-09-10T10:50:37-04:00

  docs(sphinx): fix links to reverse flags when using the :ghc-flag:`-fno-<flag>` syntax
  
  This solution is rather hacky and I suspect there is a better way to do this but I don't know
  enough about Sphinx to do better.
  
  Fixes #26352
  

• d17257ed
  by Cheng Shao at 2025-09-10T17:01:27+02:00

  rel-eng: update alpine images to 3.22
  
  This patch is a part of #25876 and updates alpine images to 3.22,
  while still retaining 3.12 for x86_64 fully_static bindists.
  
  -------------------------
  Metric Decrease:
      MultiComponentModulesRecomp
  -------------------------
  

• db3276bb
  by Sylvain Henry at 2025-09-11T11:27:28-04:00

  T16180: indicate that the stack isn't executable
  

• 11eeeba7
  by Sylvain Henry at 2025-09-11T11:27:28-04:00

  Fix some tests (statically linked GHC vs libc)
  
  When GHC is linked statically, the stdout C global variable that GHC uses
  isn't shared with the stdout C global variable used by loaded code.
  
  As a consequence, the latter must be explicitly flushed because GHC
  won't flush it before exiting.
  

• 80a07571
  by Sylvain Henry at 2025-09-11T11:28:18-04:00

  Testsuite: fix debug_rts detection
  
  Running the testsuite without Hadrian should set config.debug_rts
  correctly too.
  

• 62ae97de
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Handle heap allocation failure in I/O primops
  
  The current I/O managers do not use allocateMightFail, but future ones
  will. To support this properly we need to be able to return to the
  primop with a failure. We simply use a bool return value.
  
  Currently however, we will just throw an exception rather than calling
  the GC because that's what all the other primops do too.
  
  For the general issue of primops invoking GC and retrying, see
  https://gitlab.haskell.org/ghc/ghc/-/issues/24105
  

• cb9093f5
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Move (and rename) scheduleStartSignalHandlers into RtsSignals.h
  
  Previously it was a local helper (static) function in Schedule.c.
  
  Rename it to startPendingSignalHandlers and deifine it as an inline
  header function in RtsSignals.h. So it should still be fast.
  
  Each (new style) I/O manager is going to need to do the same, so eliminating
  the duplication now makes sense.
  

• 9736d44a
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Reduce detail in printThreadBlockage I/O blocking cases
  
  The printThreadBlockage is used in debug tracing output.
  For the cases BlockedOn{Read,Write,Delay} the output previously included
  the fd that was being waited on, and the delay target wake time.
  
  Superficially this sounds useful, but it's clearly not that useful
  because it was already wrong for the Win32 non-threaded I/O manager. In
  that situation it will print garbage (the async_result pointer, cast to
  a fd or a time).
  
  So given that it apparently never mattered that the information was
  accurate, then it's hardly a big jump to say it doesn't matter if it is
  present at all.
  
  A good reason to remove it is that otherwise we have to make a new
  API and a per-I/O manager implementation to fetch the information. And
  for some I/O manager implementations, this information is not available.
  It is not available in the win32 non-threaded I/O manager. And for some
  future Linux ones, there is no need for the fd to be stored, so storing
  it would be just extra space used for very little gain.
  
  So the simplest thing is to just remove the detail.
  

• bc0f2d5d
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add TimeoutQueue.{c,h} and corresponding tests
  
  A data structure used to efficiently manage a collection of timeouts.
  
  It is a priority queue based on absolute expiry time. It uses 64bit
  high-precision Time for the keys. The values are normal closures which
  allows for example using MVars for unblocking.
  
  It is common in many applications for timeouts to be created and then
  deleted or altered before they expire. Thus the choice of data structure
  for timeouts should support this efficiently. The implementation choice
  here is a leftist heap with the extra feature that it supports deleting
  arbitrary elements, provided the caller retain a pointer to the element.
  While the deleteMin operation takes O(log n) time, as in all heap
  structures, the delete operation for arbitrary elements /typically/
  takes O(1), and only O(log n) in the worst case. In practice, when
  managing thousands of timeouts it can be a factor of 10 faster to delete
  a random timeout queue element than to remove the minimum element. This
  supports the common use case.
  
  The plan is to use it in some of the RTS-side I/O managers to support
  their timer functionality. In this use case the heap value will be an
  MVar used for each timeout to unblock waiting threads.
  

• d1679c9d
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add ClosureTable.{c,h} and corresponding tests
  
  A table of pointers to closures on the GC heap with stable indexes.
  
  It provides O(1) alloc, free and lookup. The table can be expanded
  using a simple doubling strategy: in which case allocation is typically
  O(1) and occasionally O(n) for overall amortised O(1). No shrinking is
  used.
  
  The table itself is heap allocated, and points to other heap objects.
  As such it's necessary to use markClosureTable to ensure the table is
  used as a GC root to keep the table entries alive, and maintain proper
  pointers to them as the GC moves heap objects about.
  
  It is designed to be allocated and accesses exclusively from a single
  capability, enabling it to work without any locking. It is thus similar
  to the StablePtr table, but per-capability which removes the need for
  locking. It _should_ also provide lower GC pause times with the
  non-moving GC by spending only O(1) time in markClosureTable, vs O(n)
  for markStablePtrTable.
  
  The plan is to use it in some of the I/O managers to keep track of
  in-flight I/O operations (but not timers). This allows the tracking
  info to be kept on the (unpinned) GC heap, and shared with Haskell
  code, and by putting a pointer to the tracking information in a table,
  the index remains stable and can be passed via foreign code (like the
  kernel).
  

• 78cb8dd5
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add the StgAsyncIOOp closure type
  
  This is intended to be used by multiple I/O managers to help with
  tracking in-flight I/O operations.
  
  It is called asynchronous because from the point of view of the RTS we
  have many such operations in progress at once. From the point of view of
  a Haskell thread of course it can look synchronous.
  

• a2839896
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add StgAsyncIOOp and StgTimeoutQueue to tso->block_info
  
  These will be used by new I/O managers, for threads blocked on I/O or
  timeouts.
  

• fdc2451c
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add a new I/O manager based on poll()
  
  This is a proof of concept I/O manager, to show how to add new ones
  neatly, using the ClosureTable and TimeoutQueue infrastructure.
  
  It uses the old unix poll() API, so it is of course limited in
  performance by that, but it should have the benefit of wide
  compatibility. Also we neatly avoid a name clash with the existing
  select() I/O manager.
  
  Compared to the select() I/O manager:
  1. beause it uses poll() it is not limited to 1024 file descriptors
     (but it's still O(n) so don't expect great performance);
  2. it should have much faster threadDelay (when using it in lots of
     threads at once) because it's based on the new TimeoutQueue which is
     O(log n) rather than O(n).
  
  Some of the code related to timers/timouts is put into a shared module
  rts/posix/Timeout.{h,c} since it is intended to be shared with other
  similar I/O managers.
  

• 6c273b76
  by Duncan Coutts at 2025-09-12T13:23:34-04:00

  Document the I/O managers in the user guide
  
  and note the new poll I/O manager in the release notes.
  

• 824fab74
  by Duncan Coutts at 2025-09-12T13:23:34-04:00

  Use the poll() I/O manager by default
  
  That is, for the non-threaded RTS, prefer the poll I/O manager over the
  legacy select() one, if both can be enabled.
  
  This patch is primarily for CI testing, so we should probably remove
  this patch before merging. We can change defaults later after wider
  testing and feedback.
  

• 39392532
  by Luite Stegeman at 2025-09-12T13:24:16-04:00

  Support larger unboxed sums
  
  Change known constructor encoding for sums in interfaces to use
  11 bits for both the arity and the alternative (up from 8 and 6,
  respectively)
  

• 2af12e21
  by Luite Stegeman at 2025-09-12T13:24:16-04:00

  Decompose padding smallest-first in Cmm toplevel data constructors
  
  This makes each individual padding value aligned
  

• 418fa78f
  by Luite Stegeman at 2025-09-12T13:24:16-04:00

  Use slots smaller than word as tag for smaller unboxed sums
  
  This packs unboxed sums more efficiently by allowing
  Word8, Word16 and Word32 for the tag field if the number of
  constructors is small enough
  

• 8d7e912f
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  ghc-toolchain: Use ByteOrder rather than new Endianness
  
  Don't introduce a duplicate datatype when the previous one is equivalent
  and already used elsewhere. This avoids unnecessary translation between
  the two.
  

• 7d378476
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  Read Toolchain.Target files rather than 'settings'
  
  This commit makes GHC read `lib/targets/default.target`, a file with a
  serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`.
  
  Moreover, it removes all the now-redundant entries from `lib/settings`
  that are configured as part of a `Target` but were being written into
  `settings`.
  
  This makes it easier to support multiple targets from the same compiler
  (aka runtime retargetability). `ghc-toolchain` can be re-run many times
  standalone to produce a `Target` description for different targets, and,
  in the future, GHC will be able to pick at runtime amongst different
  `Target` files.
  
  This commit only makes it read the default `Target` configured in-tree
  or configured when installing the bindist.
  
  The remaining bits of `settings` need to be moved to `Target` in follow
  up commits, but ultimately they all should be moved since they are
  per-target relevant.
  
  Fixes #24212
  
  On Windows, the constant overhead of parsing a slightly more complex
  data structure causes some small-allocation tests to wiggle around 1 to
  2 extra MB (1-2% in these cases).
  
  -------------------------
  Metric Increase:
      MultiLayerModulesTH_OneShot
      T10421
      T10547
      T12234
      T12425
      T13035
      T18140
      T18923
      T9198
      TcPlugin_RewritePerf
  -------------------------
  

• e0780a16
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  ghc-toolchain: Move TgtHasLibm to per-Target file
  
  TargetHasLibm is now part of the per-target configuration
  
  Towards #26227
  

• 8235dd8c
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  ghc-toolchain: Move UseLibdw to per-Target file
  
  To support DWARF unwinding, the RTS must be built with the -f+libdw flag
  and with the -DUSE_LIBDW macro definition. These flags are passed on
  build by Hadrian when --enable-dwarf-unwinding is specified at configure
  time.
  
  Whether the RTS was built with support for DWARF is a per-target
  property, and as such, it was moved to the per-target
  GHC.Toolchain.Target.Target file.
  
  Additionally, we keep in the target file the include and library paths
  for finding libdw, since libdw should be checked at configure time (be
  it by configure, or ghc-toolchain, that libdw is properly available).
  
  Preserving the user-given include paths for libdw facilitates in the
  future building the RTS on demand for a given target (if we didn't keep
  that user input, we couldn't)
  
  Towards #26227
  

• d5ecf2e8
  by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00

  ghc-toolchain: Make "Support SMP" a query on a Toolchain.Target
  
  "Support SMP" is merely a function of target, so we can represent it as
  such in `ghc-toolchain`.
  
  Hadrian queries the Target using this predicate to determine how to
  build GHC, and GHC queries the Target similarly to report under --info
  whether it "Support SMP"
  
  Towards #26227
  

• e07b031a
  by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00

  ghc-toolchain: Make "tgt rts linker only supports shared libs" function on Target
  
  Just like with "Support SMP", "target RTS linker only supports shared
  libraries" is a predicate on a `Target` so we can just compute it when
  necessary from the given `Target`.
  
  Towards #26227
  

• 14123ee6
  by Simon Peyton Jones at 2025-09-12T17:58:07-04:00

  Solve forall-constraints via an implication, again
  
  In this earlier commit:
  
    commit 953fd8f1dc080f1c56e3a60b4b7157456949be29
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Jul 21 10:06:43 2025 +0100
  
    Solve forall-constraints immediately, or not at all
  
  I used a all-or-nothing strategy for quantified constraints
  (aka forall-constraints).  But alas that fell foul of #26315,
  and #26376.
  
  So this MR goes back to solving a quantified constraint by
  turning it into an implication; UNLESS we are simplifying
  constraints from a SPECIALISE pragma, in which case the
  all-or-nothing strategy is great.  See:
  
     Note [Solving a Wanted forall-constraint]
  
  Other stuff in this MR:
  
  * TcSMode becomes a record of flags, rather than an enumeration
    type; much nicer.
  
  * Some fancy footwork to avoid error messages worsening again
    (The above MR made them better; we want to retain that.)
    See `GHC.Tc.Errors.Ppr.pprQCOriginExtra`.
  
  -------------------------
  Metric Decrease:
      T24471
  -------------------------
  

• e6c192e2
  by Simon Peyton Jones at 2025-09-12T17:58:07-04:00

  Add a test case for #26396
  
  ...same bug ast #26315
  

• 8f3d80ff
  by Luite Stegeman at 2025-09-13T08:43:09+02:00

  Use mkVirtHeapOffsets for reconstructing terms in RTTI
  
  This makes mkVirtHeapOffsets the single source of truth for
  finding field offsets in closures.
  

• eb389338
  by Luite Stegeman at 2025-09-13T08:43:09+02:00

  Sort non-pointer fields by size for more efficient packing
  
  This sorts non-pointer fields in mkVirtHeapOffsets, always
  storing the largest field first. The relative order of
  equally sized fields remains unchanged.
  
  This reduces wasted padding/alignment space in closures with
  differently sized fields.
  

• 99b233f4
  by Alison at 2025-09-13T16:51:04-04:00

  ghc-heap: Fix race condition with profiling builds
  
  Apply the same fix from Closures.hs (64fd0fac83) to Heap.hs by adding
  empty imports to make way-dependent dependencies visible to `ghc -M`.
  
  Fixes #15197, #26407
  

• 77deaa7a
  by Cheng Shao at 2025-09-14T21:29:45-04:00

  hadrian: build in-tree gmp with -fvisibility=hidden
  
  When hadrian builds in-tree gmp, it should build the shared objects
  with -fvisibility=hidden. The gmp symbols are only used by bignum
  logic in ghc-internal and shouldn't be exported by the ghc-internal
  shared library. We should always strive to keep shared library symbol
  table lean, which benefits platforms with slow dynamic linker or even
  hard limits about how many symbols can be exported (e.g. macos dyld,
  win32 dll and wasm dyld).
  

• 42a18960
  by Cheng Shao at 2025-09-14T21:30:26-04:00

  Revert "wasm: add brotli compression for ghci browser mode"
  
  This reverts commit 731217ce68a1093b5f9e26a07d5bd2cdade2b352.
  Benchmarks show non-negligible overhead when browser runs on the same
  host, which is the majority of actual use cases.
  

• e6755b9f
  by Cheng Shao at 2025-09-14T21:30:26-04:00

  wasm: remove etag logic in ghci browser mode web server
  
  This commit removes the etag logic in dyld script's ghci browser mode
  web server. It was meant to support caching logic of wasm shared
  libraries, but even if the port is manually specified to make caching
  even relevant, for localhost the extra overhead around etag logic is
  simply not worth it according to benchmarks.
  

• ac5859b9
  by sheaf at 2025-09-16T14:58:38-04:00

  Add 'Outputable Natural' instance
  
  This commit adds an Outputable instance for the Natural natural-number type,
  as well as a "natural :: Natural -> SDoc" function that mirrors the existing
  "integer" function.
  

• d48ebc23
  by Cheng Shao at 2025-09-16T14:59:18-04:00

  autoconf: emit warning instead of error for FIND_PYTHON logic
  
  This patch makes FIND_PYTHON logic emit warning instead of error, so
  when the user doesn't expect to run the testsuite driver (especially
  when installing a bindist), python would not be mandatory. Fixes #26347.
  

• 54b5950e
  by Sylvain Henry at 2025-09-17T04:45:18-04:00

  Print fully qualified unit names in name mismatch
  
  It's more user-friendly to directly print the right thing instead of
  requiring the user to retry with the additional `-dppr-debug` flag.
  

• 403cb665
  by Ben Gamari at 2025-09-17T04:46:00-04:00

  configure: Fix consistency between distrib and source CC check
  
  Previously distrib/configure.ac did not
  include `cc`.
  
  Closes #26394.
  

• 2dcd4cb9
  by Oleg Grenrus at 2025-09-17T04:46:41-04:00

  Use isPrint in showUnique
  
  The comment say
  
  ```
  -- Avoid emitting non-printable characters in pretty uniques. See #25989.
  ```
  
  so let the code do exactly that.
  
  There are tags (at least : and 0 .. 9) which weren't in A .. z range.
  

• e5dd754b
  by Oleg Grenrus at 2025-09-17T04:46:42-04:00

  Shorten in-module links in hyperlinked source
  
  Instead of href="This.Module#ident" to just "#ident"
  

• 63189b2c
  by Oleg Grenrus at 2025-09-17T04:46:42-04:00

  Use showUnique in internalAnchorIdent
  
  Showing the key of Unique as a number is generally not a great idea.
  GHC Unique has a tag in high bits, so the raw number is unnecessarily
  big.
  
  So now we have
  
  ```html
  <a href="#l-rvgK"><span class="hs-identifier hs-var hs-var">bar</span></a>
  ```
  
  instead of
  
  ```html
  <a href="#local-6989586621679015689"><span class="hs-identifier hs-var hs-var">bar</span></a>
  ```
  
  Together with previous changes of shorter intra-module links the effect
  on compressed files is not huge, that is expected as we simply remove
  repetitive contents which pack well.
  
  ```
  12_694_206  Agda-2.9.0-docs-orig.tar.gz
  12_566_065  Agda-2.9.0-docs.tar.gz
  ```
  
  However when unpacked, the difference can be significant,
  e.g. Agda's largest module source got 5% reduction:
  
  ```
  14_230_117  Agda.Syntax.Parser.Parser.html
  13_422_109  Agda.Syntax.Parser.Parser.html
  ```
  
  The whole hyperlinked source code directory got similar reduction
  
  ```
  121M	Agda-2.9.0-docs-orig/src
  114M	Agda-2.9.0-docs/src
  ```
  
  For the reference, sources are about 2/3 of the generated haddocks
  
  ```
  178M	Agda-2.9.0-docs-old
  172M	Agda-2.9.0-docs
  ```
  
  so we get around 3.5% size reduction overall. Not bad for a small local
  changes.
  

• 6f63f57b
  by Stefan Schulze Frielinghaus at 2025-09-17T04:47:22-04:00

  rts: Fix alignment for gen_workspace #26334
  
  After a0fa4941903272c48b050d24e93eec819eff51bd bootstrap is broken on
  s390x and errors out with
  
  rts/sm/GCThread.h:207:5: error:
       error: alignment of array elements is greater than element size
        207 |     gen_workspace gens[];
            |     ^~~~~~~~~~~~~
  
  The alignment constraint is applied via the attribute to the type
  gen_workspace and leaves the underlying type struct gen_workspace_
  untouched.  On Aarch64, x86, and s390x the struct has a size of 128
  bytes.  On Aarch64 and x86 the alignments of 128 and 64 are divisors of
  the size, respectively, which is why the type is a viable member type
  for an array.  However, on s390x, the alignment is 256 and therefore is
  not a divisor of the size and hence cannot be used for arrays.
  
  Basically I see two fixes here.  Either decrease the alignment
  requirement on s390x, or by applying the alignment constraint on the
  struct itself.  The former might affect performance as noted in
  a0fa4941903272c48b050d24e93eec819eff51bd.  The latter introduces padding
  bits whenever necessary in order to ensure that
  sizeof(gen_workspace[N])==N*sizeof(gen_workspace) holds which is done by
  this patch.
  

• 06d25623
  by Cheng Shao at 2025-09-17T19:32:27-04:00

  ghci: add :shell command
  
  This patch adds a new :shell command to ghci which works similarly to
  :!, except it guarantees to run the command via sh -c. On POSIX hosts
  the behavior is identical to :!, but on Windows it uses the msys2
  shell instead of system cmd.exe shell. This is convenient when writing
  simple ghci scripts that run simple POSIX commands, and the behavior
  can be expected to be coherent on both Windows and POSIX.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 186054f7
  by Cheng Shao at 2025-09-17T19:32:27-04:00

  testsuite: remove legacy :shell trick
  
  This commit makes use of the built-in :shell functionality in ghci in
  the test cases, and remove the legacy :shell trick.
  

• 0a3a4aa3
  by Cheng Shao at 2025-09-17T19:32:27-04:00

  docs: document :shell in ghci
  
  This commit documents the :shell command in ghci.
  
  Co-authored-by: Codex <codex@openai.com>
  

• a4ff12bb
  by Cheng Shao at 2025-09-17T19:33:09-04:00

  ghc-internal: fix codepages program
  
  codepages was not properly updated during the base -> ghc-internal
  migration, this commit fixes it.
  

• 7e094def
  by Cheng Shao at 2025-09-17T19:33:09-04:00

  ghc-internal: relax ucd2haskell cabal upper bounds
  
  This commit relaxes ucd2haskell cabal upper bounds to make it runnable
  via ghc 9.12/9.14.
  

• 7077c9f7
  by Cheng Shao at 2025-09-17T19:33:09-04:00

  ghc-internal: update to unicode 17.0.0
  
  This commit updates the generated code in ghc-internal to match
  unicode 17.0.0.
  

• cef8938f
  by sheaf at 2025-09-17T19:34:09-04:00

  Bad record update msg: allow out-of-scope datacons
  
  This commit ensures that, when we encounter an invalid record update
  (because no constructor exists which contains all of the record fields
  mentioned in the record update), we graciously handle the situation in
  which the constructors themselves are not in scope. In that case,
  instead of looking up the constructors in the GlobalRdrEnv, directly
  look up their GREInfo using the lookupGREInfo function.
  
  Fixes #26391
  

• a2d9d7c2
  by sheaf at 2025-09-17T19:34:09-04:00

  Improve Notes about disambiguating record updates
  
  This commit updates the notes [Disambiguating record updates] and
  [Type-directed record disambiguation], in particular adding more
  information about the deprecation status of type-directed disambiguation
  of record updates.
  

• de44e69e
  by sheaf at 2025-09-19T05:16:51-04:00

  Enable TcM plugins in initTc
  
  This commit ensures that we run typechecker plugins and defaulting
  plugins whenever we call initTc.
  
  In particular, this ensures that the pattern-match checker, which calls
  'initTcDsForSolver' which calls 'initTc', runs with typechecker plugins
  enabled. This matters for situations like:
  
    merge :: Vec n a -> Vec n a -> Vec (2 * n) a
    merge Nil Nil = Nil
    merge (a <: as) (b <: bs) = a :< (b <: merge as bs)
  
  in which we need the typechecker plugin to run in order to tell us that
  the Givens would be inconsistent in the additional equation
  
    merge (_ <: _) Nil
  
  and thus that the equation is not needed.
  
  Fixes #26395
  

• 2c378ad2
  by Cheng Shao at 2025-09-19T05:17:33-04:00

  rel-eng: update fedora image to 42
  
  This patch is a part of #25876 and updates fedora image to 42.
  

• 0a9d9ffc
  by Sylvain Henry at 2025-09-19T13:12:14-04:00

  Fix output of T14999 (#23685)
  
  Fix output of T14999 to:
  - take into account the +1 offset to DW_AT_low_pc (see Note [Info Offset])
  - always use Intel's syntax to force consistency: it was reported that
    sometimes GDB prints `jmpq` instead of `jmp` with the AT&T syntax
  

• 1480872a
  by Vladislav Zavialov at 2025-09-19T13:12:54-04:00

  Fix PREP_MAYBE_LIBRARY in prep_target_file.m4
  
  This change fixes a configure error introduced in:
  
    commit 8235dd8c4945db9cb03e3be3c388d729d576ed1e
    ghc-toolchain: Move UseLibdw to per-Target file
  
  Now the build no longer fails with:
  
    acghc-toolchain: Failed to read a valid Target value from hadrian/cfg/default.target
  

• d1d9e39e
  by Ben Gamari at 2025-09-19T18:24:52-04:00

  StgToByteCode: Don't assume that data con workers are nullary
  
  Previously StgToByteCode assumed that all data-con workers were of a
  nullary representation. This is not a valid assumption, as seen
  in #23210, where an unsaturated application of a unary data
  constructor's worker resulted in invalid bytecode. Sadly, I have not yet
  been able to reduce a minimal testcase for this.
  
  Fixes #23210.
  

• 3eeecd50
  by Ben Gamari at 2025-09-19T18:24:53-04:00

  testsuite: Mark T23146* as unbroken
  

• 2e73f342
  by sheaf at 2025-09-19T18:24:53-04:00

  Add test for #26216
  

• c2efb912
  by Sven Tennie at 2025-09-19T18:25:36-04:00

  Generate correct test header
  
  This increases convenience when copying & pasting...
  

• d2fb811e
  by Sven Tennie at 2025-09-19T18:25:36-04:00

  foundation test: Fix shift amount (#26248)
  
  Shift primops' results are only defined for shift amounts of 0 to word
  size - 1. The approach is similar to testing div-like operations (which
  have a constraint regarding zero operands.)
  
  This was partly vibe coded (https://github.com/supersven/ghc/pull/1) but
  then heavily refactored.
  

• a62ce115
  by Andreas Klebinger at 2025-09-19T18:26:18-04:00

  Tweak jspace test
  
  I've given it a longer timeout, and tweaked the test file generation
  to speed it up a bit. Hopefully that is enough to make it constentily pass.
  
  Last but not least it now also always uses three threads.
  

• 0f034942
  by Cheng Shao at 2025-09-19T18:26:59-04:00

  rts: remove obsolete CC_SUPPORTS_TLS logic
  
  This patch removes obsolete CC_SUPPORTS_TLS logic throughout the rts,
  given __thread is now uniformly supported by C toolchains of all
  platforms we currently support.
  

• ef705655
  by Cheng Shao at 2025-09-19T18:27:41-04:00

  rts: remove obsolete HAS_VISIBILITY_HIDDEN logic
  
  This patch removes obsolete HAS_VISIBILITY_HIDDEN logic throughout the
  rts, given __attribute__((visibility("hidden"))) is uniformly
  supported by C toolchains of all platforms we currently support.
  

• 9fdc1f7d
  by Cheng Shao at 2025-09-19T18:28:21-04:00

  rts: remove -O3 pragma hack in Hash.c
  
  This patch removes an obsolete gcc pragma to specify -O3 in Hash.c.
  Hadrian already passes the right flag.
  

• b8cfa8f7
  by Cheng Shao at 2025-09-19T18:29:01-04:00

  rts: remove obsolete COMPILING_WINDOWS_DLL logic
  
  This patch removes obsolete COMPILING_WINDOWS_DLL logic throughout the
  rts. They were once used for compiling to win32 DLLs, but we haven't
  been able to compile Haskell units to win32 DLLs for many years now,
  due to PE format's restriction of no more than 65536 exported symbols
  in a single DLL.
  

• bb760611
  by Cheng Shao at 2025-09-19T18:29:42-04:00

  wasm: bump browser_wasi_shim to 0.4.2
  
  This patch bumps the browser_wasi_shim dependency of wasm dyld script
  to 0.4.2.
  

• 8b0940db
  by Cheng Shao at 2025-09-20T06:48:05-04:00

  compiler: move Binary instance of Map to GHC.Utils.Binary
  
  This patch moves `Binary` instance of `Map` from `haddock-api` to
  `GHC.Utils.Binary`. This also allows us to remove a redundant instance
  defined for `NameEntityInfo`, which is a type synonym for `Map`.
  

• 4a8fed75
  by Vladislav Zavialov at 2025-09-20T06:48:47-04:00

  Fix keyword in ExplicitNamespaces error message (#26418)
  
  Consider this module header and the resulting error:
  
    {-# LANGUAGE NoExplicitNamespaces #-}
    module T26418 (data HeadC) where
  
    -- error: [GHC-47007]
    --   Illegal keyword 'type'
  
  Previously, the error message would mention 'type' (as shown above),
  even though the user wrote 'data'. This has now been fixed.
  
  The error location has also been corrected: it is now reported at the
  keyword position rather than at the position of the associated
  import/export item.
  

• 867c2675
  by Cheng Shao at 2025-09-20T06:49:28-04:00

  wasm: fix dyld handling for forward declared GOT.func items
  
  This patch fixes wasm shared linker's handling of forward declared
  GOT.func items, see linked issue for details. Also adds T26430 test to
  witness the fix. Fixes #26430.
  
  Co-authored-by: Codex <codex@openai.com>
  

• e7df6cc0
  by Simon Peyton Jones at 2025-09-23T14:34:39-04:00

  Improve pretty printer for HsExpr
  
  Given a very deeply-nested application, it just kept printing
  deeper and deeper.  This small change makes it cut off.
  
  Test is in #26330, but we also get a dramatic decrease in compile
  time for perf/compiler/InstanceMatching:
     InstanceMatching  4,086,884,584  1,181,767,232 -71.1% GOOD
  Why? Because before we got a GIGANTIC error message that took
  ages to pretty-print; now we get this much more civilised message
  (I have removed some whitespace.)
  
  Match.hs:1007:1: error:
      • No instance for ‘Show (F001 a)’ arising from a use of ‘showsPrec’
      • In the second argument of ‘showString’, namely
          ‘(showsPrec
              11 b1
           (GHC.Internal.Show.showSpace
              (showsPrec
                 11 b2
           (GHC.Internal.Show.showSpace
              (showsPrec
                 11 b3
           (GHC.Internal.Show.showSpace
              (showsPrec
                 11 b4
           (GHC.Internal.Show.showSpace
              (showsPrec
                 11 b5
           (GHC.Internal.Show.showSpace
              (showsPrec
                 11 b6
                 (GHC.Internal.Show.showSpace (showsPrec ...)))))))))))))’
  
  -----------------------
  The main payload is
  
  * At the start of `pprExpr`
  * In the defn of `pprApp`
  
  A little bit of refactoring:
  
  * It turned out that we were setting the default cut-off depth to a
    fixed value in two places, so changing one didn't change the other.
    See defaultSDocDepth and defaultSDocCols
  
  * I refactored `pprDeeperList` a bit so I could understand it better.
  
  Because the depth calculation has changed, there are lots of small
  error message wibbles.
  
  Metric Decrease:
      InstanceMatching
  

• 209f0158
  by Simon Peyton Jones at 2025-09-23T14:34:39-04:00

  Use Outputable.ellipsis rather than text "..."
  

• 64bb0e37
  by Sylvain Henry at 2025-09-23T14:35:56-04:00

  deriveConstants: automatically pass -fcommon CC flag (#26393)
  
  By mistake we tried to use deriveConstants without passing
  `--gcc-flag -fcommon` (which Hadrian does) and it failed.
  
  This patch:
  1. adds parsing support for constants stored in the .bss section (i.e.
     when -fcommon isn't passed)
  2. enables passing `-fcommon` automatically to the C compiler because
     Windows requires this for subtle reasons
  3. Documents the subtle reasons
  
  (1) isn't strictly necessary because we always do (2) but it does no
  harm and it is still useful if the CC flags ever contain -fno-common
  

• afcdf92f
  by Oleg Grenrus at 2025-09-23T14:36:41-04:00

  Don't wrap spaces in <span>s
  
  Doing similar comparison as in 63189b2ceca07edf4e179f4180ca60d470c62cb3
  
  With this change the gzipped documentation is now 2% smaller (previously 1%)
  
  12_694_206 Agda-2.9.0-docs-orig.tar.gz
  12_436_829 Agda-2.9.0-docs.tar.gz
  
  Unzipped docs are 5% smaller (previously 3%)
  
  178M	Agda-2.9.0-docs-orig
  169M	Agda-2.9.0-docs
  
  Individual hyperlinked sources are around 7-10% smaller (previously 5%)
  (`Parser` module is generated by happy and has relatively little whitespace)
  
  14_230_117 Agda.Syntax.Parser.Parser.html
  13_220_758 Agda.Syntax.Parser.Parser.html
  
  Agda's hyperlinked sources are 9% smaller now:
  
  121M	Agda-2.9.0-docs-orig/src
  110M	Agda-2.9.0-docs/src
  

• 67de53a6
  by Cheng Shao at 2025-09-23T14:37:31-04:00

  rts: remove obsolete __GNUC__ related logic
  
  This patch removes obsolete `__GNUC__` related logic, given on any
  currently supported platform and toolchain, `__GNUC__ >= 4` is
  universally true. Also pulls some other weeds and most notably, use
  `__builtin___clear_cache` for clang as well, since clang has supported
  this gcc intrinsic since 2014, see
  https://github.com/llvm/llvm-project/commit/c491a8d4577052bc6b3b4c72a7db6a7cfcbc2ed0.
  

• c4d32493
  by Sven Tennie at 2025-09-23T20:40:57-04:00

  RV64: Fix: Add missing truncation to MO_S_Shr (#26248)
  
  Sub-double word (<W64) registers need to be truncated after the
  operation.
  

• 41dce477
  by Sven Tennie at 2025-09-23T20:40:57-04:00

  RV64: Cleanup shift emitting cases/code
  
  Remove overlapping cases to make the shift logic easier to understand.
  

• 0a601c30
  by Alex Washburn at 2025-09-23T20:41:41-04:00

  Correcting LLVM linking of Intel BMI intrinsics pdep{8,16} and pext{8,16}.
  
  This patch fixes #26065.
  
  The LLVM interface does not expose bindings to:
  
    - llvm.x86.bmi.pdep.8
    - llvm.x86.bmi.pdep.16
    - llvm.x86.bmi.pext.8
    - llvm.x86.bmi.pext.16
  
  So calls are instead made to llvm.x86.bmi.{pdep,pext}.32 in these cases,
  with pre/post-operation truncation to constrain the logical value range.
  

• 89e8ff3d
  by Peng Fan at 2025-09-23T20:42:37-04:00

  NCG/LA64: Implement MO_BSwap and MO_BRev with bit-manipulation Instructions
  

• 50f6be09
  by Sylvain Henry at 2025-09-23T20:43:29-04:00

  Allow Core plugins to access unoptimized Core (#23337)
  
  Make the first simple optimization pass after desugaring a real CoreToDo
  pass. This allows CorePlugins to decide whether they want to be executed
  before or after this pass.
  

• 30ef0aac
  by Simon Hengel at 2025-09-23T20:44:12-04:00

  docs: Fix typo in scoped_type_variables.rst

• f8919262
  by Cheng Shao at 2025-09-23T20:44:54-04:00

  ghci: fix bootstrapping with 9.12.3-rc1 and above
  
  This patch fixes bootstrapping GHC with 9.12.3-rc1 and above. ghci
  defines `Binary` instance for `HalfWord` in `ghc-heap`, which is a
  proper `newtype` in 9.14 and starting from 9.12.3. Given we don't
  build `ghc-heap` in stage0, we need to fix this predicate so that it
  corresponds to the boot ghc versions that contain the right version of
  `ghc-heap`.
  

• a7f15858
  by sheaf at 2025-09-24T09:49:53-04:00

  User's guide: clarify optimisation of INLINABLE unfoldings
  
  This updates the user's guide section on INLINABLE pragmas to explain how
  the unfoldings of inlineable functions are optimised. The user's guide incorrectly
  stated that the RHS was not optimised at all, but this is not true. Instead, GHC
  is careful about phase control to optmise the RHS while retaining the guarantee
  that GHC behaves as if the original RHS had been written.

• 495886d9
  by Rodrigo Mesquita at 2025-09-24T09:50:35-04:00

  cleanup: Delete historical artifact of COMPILING_WINDOWS_DLL
  
  Namely, drop the obsolete
  - DLL_IMPORT_RTS
  - DLL_IMPORT_DATA_VAR
  - DLL_IMPORT_DATA_VARNAME
  - DLL_IMPORT_DATA_REF
  
  These macros were not doing anything and placed inconsistently
  
  Looking at the git logs reveal these macros were used to support
  dynamic libraries on Win32, a feature that was dropped
  in b8cfa8f741729ef123569fb321c4b2ab4a1a941c
  
  This allows us to get rid of the rts/DLL.h file too.
  

• 5ae89054
  by Sylvain Henry at 2025-09-24T17:07:00-04:00

  Allow disabling builtin rules (#20298)
  
  Add a way to disable built-in rules programmatically and with a debug flag.
  
  I also took the opportunity to add a debug flag to disable bignum rules,
  which was only possible programmatically (e.g. in a plugin).
  

• 135242ca
  by Rodrigo Mesquita at 2025-09-24T17:07:44-04:00

  Don't use build CFLAGS and friends as target settings
  
  In the GHC in tree configure, `CFLAGS`, `CXXFLAGS`, and similar tool
  configuration flags apply to the BUILD phase of the compiler, i.e. to
  the tools run to compile GHC itself.
  
  Notably, they should /not/ be carried over to the Target settings, i.e.
  these flags should /not/ apply to the tool which GHC invokes at runtime.
  
  Fixes #25637
  

• b418408b
  by Irene Knapp at 2025-09-25T09:47:54-04:00

  Document etymology of "bind" as the name for `>>=`
  
  It took me twenty years of contemplation to realize why it's called that.
  I therefore feel that it may not be obvious to beginners.
  

• e9c5e46f
  by Brandon Chinn at 2025-09-25T09:48:36-04:00

  Fix tabs in string gaps (#26415)
  
  Tabs in string gaps were broken in bb030d0d because previously, string gaps were manually parsed, but now it's lexed by the usual Alex grammar and post-processed after successful lexing.
  
  It broke because of a discrepancy between GHC's lexer grammar and the Haskell Report. The Haskell Report includes tabs in whitechar:
  
  whitechar  →  newline | vertab | space | tab | uniWhite
  
  $whitechar used to include tabs until 18 years ago, when it was removed in order to exclude tabs from $white_no_nl in order to warn on tabs: 6e202120. In this MR, I'm adding \t back into $whitechar, and explicitly excluding \t from the $white_no_nl+ rule ignoring all whitespace in source code, which more accurately colocates the "ignore all whitespace except tabs, which is handled in the next line" logic.
  
  As a side effect of this MR, tabs are now allowed in pragmas; currently, a pragma written as {-# \t LANGUAGE ... #-} is interpreted as the tab character being the pragma name, and GHC warns "Unrecognized pragma". With this change, tabs are ignored as whitespace, which more closely matches the Report anyway.
  

• 8bf5b309
  by Cheng Shao at 2025-09-25T09:49:18-04:00

  wasm: remove the --no-turbo-fast-api-calls hack from dynamic linker shebang
  
  This patch removes the `--no-turbo-fast-api-calls` hack from the dyld
  script shebang; it was used to workaround v8 fast call coredumps in
  nodejs and no longer needed, and comes with a performance penalty,
  hence the removal.
  

• c1cab0c3
  by Sylvain Henry at 2025-09-26T10:36:30-04:00

  Revert "Add necessary flag for js linking"
  
  This reverts commit 84f68e2231b2eddb2e1dc4e90af394ef0f2e803f.
  
  This commit didn't have the expected effect. See discussion in #26290.
  Instead we export HEAP8 and HEAPU8 from rts/js/mem.js
  

• 0a434a80
  by Sylvain Henry at 2025-09-26T10:36:30-04:00

  JS: export HEAPU8 (#26290)
  
  This is now required by newer Emscripten versions.
  

• b10296a9
  by Andreas Klebinger at 2025-09-26T10:37:11-04:00

  sizeExpr: Improve Tick handling.
  
  When determining if we scrutinize a function argument we
  now properly look through ticks. Fixes #26444.
  

• d9e2a9a7
  by mniip at 2025-09-26T16:00:50-04:00

  rts: Refactor parsing of -h flags
  
  We have a nontrivial amount of heap profiling flags available in the
  non-profiled runtime, so it makes sense to reuse the parsing code
  between the profiled and the non-profiled runtime, only restricting
  which flags are allowed.
  

• 089e45aa
  by mniip at 2025-09-26T16:00:50-04:00

  rts: Fix parsing of -h options with braces
  
  When the "filter by" -h options were introduced in
  bc210f7d267e8351ccb66972f4b3a650eb9338bb, the braces were mandatory.
  Then in 3c22fb21fb18e27ce8d941069a6915fce584a526, the braces were made
  optional. Then in d1ce35d2271ac8b79cb5e37677b1a989749e611c the brace
  syntax stopped working, and no one seems to have noticed.
  

• 423f1472
  by mniip at 2025-09-26T16:00:50-04:00

  rts: add -hT<type> and -hi<table id> heap filtering options (#26361)
  
  They are available in non-profiled builds.
  
  Along the way fixed a bug where combining -he<era> and -hr<retainer>
  would ignore whether the retainer matches or not.
  

• 4cda4785
  by mniip at 2025-09-26T16:00:50-04:00

  docs: Document -hT<type> and -hi<addr>
  

• 982ad30f
  by mniip at 2025-09-26T16:00:50-04:00

  rts: Refactor dumping the heap census
  
  Always do the printing of the total size right next to where the bucket
  label is printed. This prevents accidentally printing a label without
  the corresponding amount.
  
  Fixed a bug where exactly this happened for -hi profile and the 0x0
  (uncategorized) info table.
  
  There is now also much more symmetry between fprintf(hp_file,...) and
  the corresponding traceHeapProfSampleString.
  

• 8cbe006a
  by Cheng Shao at 2025-09-26T16:01:34-04:00

  hadrian: fix GHC.Platform.Host generation for cross stage1
  
  This patch fixes incorrectly GHC.Platform.Host generation logic for
  cross stage1 in hadrian (#26449). Also adds T26449 test case to
  witness the fix.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 0ddd0fdc
  by soulomoon at 2025-09-28T19:24:10-04:00

  Remove hptAllInstances usage during upsweep
  
  Previously, during the upsweep phase when
  checking safe imports, we were loading the module
  interface with runTcInteractive, which in turn calls
  hptAllInstances. This accesses non-below modules
  from the home package table.
  
  Change the implementation of checkSafeImports
  to use initTcWithGbl and loadSysInterface to load the
  module interface, since we already have TcGblEnv at hand.
  This eliminates the unnecessary use of runTcInteractive
  and hptAllInstances during the upsweep phase.
  

• e05c496c
  by Ben Gamari at 2025-09-28T19:24:59-04:00

  base: Update changelog to reflect timing of IOPort# removal
  
  This change will make 9.14 afterall.
  

• bdc9d130
  by Cheng Shao at 2025-09-28T19:25:45-04:00

  rts: fix wasm JSFFI initialization constructor code
  
  This commit fixes wasm JSFFI initialization constructor code so that
  the constructor is self-contained and avoids invoking a fake
  __main_argc_argv function. The previous approach of reusing
  __main_void logic in wasi-libc saves a tiny bit of code, at the
  expense of link-time trouble whenever GHC links a wasm module without
  -no-hs-main, in which case the driver-generated main function would
  clash with the definition here, resulting in a linker error. It's
  simply better to avoid messing with the main function, and it would
  additionally allow linking wasm32-wasi command modules that does make
  use of synchronous JSFFI.
  

• 5d59fc8f
  by Cheng Shao at 2025-09-28T19:26:27-04:00

  rts: provide stub implementations of ExecPage functions for wasm
  
  This patch provides stub implementations of ExecPage functions for
  wasm. They are never actually invoked at runtime for any non-TNTC
  platform, yet they can cause link-time errors of missing symbols when
  the GHCi.InfoTable module gets linked into the final wasm module (e.g.
  a GHC API program).
  

• a4d664c7
  by Cheng Shao at 2025-09-29T17:29:22+02:00

  compiler/ghci: replace the LoadDLL message with LoadDLLs
  
  As a part of #25407, this commit changes the LoadDLL message to
  LoadDLLs, which takes a list of DLL paths to load and returns the list
  of remote pointer handles. The wasm dyld is refactored to take
  advantage of LoadDLLs and harvest background parallelism. On other
  platforms, LoadDLLs is based on a fallback codepath that does
  sequential loading.
  
  The driver is not actually emitting singular LoadDLLs message with
  multiple DLLs yet, this is left in subsequent commits.
  
  Co-authored-by: Codex <codex@openai.com>
  

• c7fc4bae
  by Cheng Shao at 2025-09-29T17:29:22+02:00

  driver: separate downsweep/upsweep phase in loadPackages'
  
  This commit refactors GHC.Linker.Loader.loadPackages' to be separated
  into downsweep/upsweep phases:
  
  - The downsweep phase performs dependency analysis and generates a
    list of topologically sorted packages to load
  - The upsweep phase sequentially loads these packages by calling
    loadPackage
  
  This is a necessary refactoring to make it possible to make loading of
  DLLs concurrent.
  

• ab180104
  by Cheng Shao at 2025-09-29T17:57:19+02:00

  driver: emit single LoadDLLs message to load multiple DLLs
  
  This commit refactors the driver so that it emits a single LoadDLLs
  message to load multiple DLLs in GHC.Linker.Loader.loadPackages'.
  Closes #25407.
  
  -------------------------
  Metric Increase:
      MultiLayerModulesTH_OneShot
      TcPlugin_RewritePerf
  -------------------------
  
  Co-authored-by: Codex <codex@openai.com>
  

• 9c304ec0
  by Sean D. Gillespie at 2025-09-29T19:57:07-04:00

  Fix SIZED_BIN_OP_TY_INT casts in RTS interpreter
  
  Correct `SIZED_BIN_OP_TY_INT` cast to integer. Previously, it cast
  its second operand as its parameter `ty`. This does not currently
  cause any issues, since we are only using it for bit shifts.
  
  Fixes #26287
  

• a1de535f
  by Luite Stegeman at 2025-09-30T18:40:28-04:00

  rts: Fix lost wakeups in threadPaused for threads blocked on black holes
  
  The lazy blackholing code in threadPaused could overwrite closures
  that were already eagerly blackholed, and as such wouldn't have a
  marked update frame. If the black hole was overwritten by its
  original owner, this would lead to an undetected collision, and
  the contents of any existing blocking queue being lost.
  
  This adds a check for eagerly blackholed closures and avoids
  overwriting their contents.
  
  Fixes #26324
  

• b7e21e49
  by Luite Stegeman at 2025-09-30T18:40:28-04:00

  rts: push the correct update frame in stg_AP_STACK
  
  The frame contains an eager black hole (__stg_EAGER_BLACKHOLE_info) so
  we should push an stg_bh_upd_frame_info instead of an stg_upd_frame_info.
  

• 02a7c18a
  by Cheng Shao at 2025-09-30T18:41:27-04:00

  ghci: fix lookupSymbolInDLL behavior on wasm
  
  This patch fixes lookupSymbolInDLL behavior on wasm to return Nothing
  instead of throwing. On wasm, we only have lookupSymbol, and the
  driver would attempt to call lookupSymbolInDLL first before falling
  back to lookupSymbol, so lookupSymbolInDLL needs to return Nothing
  gracefully for the fallback behavior to work.
  

• aa0ca5e3
  by Cheng Shao at 2025-09-30T18:41:27-04:00

  hadrian/compiler: enable internal-interpreter for ghc library in wasm stage1
  
  This commit enables the internal-interpreter flag for ghc library in
  wasm stage1, as well as other minor adjustments to make it actually
  possible to launch a ghc api session that makes use of the internal
  interpreter. Closes #26431 #25400.
  

• 69503668
  by Cheng Shao at 2025-09-30T18:41:27-04:00

  testsuite: add T26431 test case
  
  This commit adds T26431 to testsuite/tests/ghci-wasm which goes
  through the complete bytecode compilation/linking/running pipeline in
  wasm, so to witness that the ghc shared library in wasm have full
  support for internal-interpreter.
  

• e9445c01
  by Matthew Pickering at 2025-09-30T18:42:23-04:00

  driver: Load bytecode static pointer entries during linking
  
  Previously the entries were loaded too eagerly, during upsweep, but we
  should delay loading them until we know that the relevant bytecode
  object is demanded.
  
  Towards #25230
  

• b8307eab
  by Cheng Shao at 2025-09-30T18:43:14-04:00

  autoconf/ghc-toolchain: remove obsolete C99 check
  
  This patch removes obsolete c99 check from autoconf/ghc-toolchain. For
  all toolchain & platform combination we support, gnu11 or above is
  already supported without any -std flag required, and our RTS already
  required C11 quite a few years ago, so the C99 check is completely
  pointless.
  

• 9c293544
  by Simon Peyton Jones at 2025-10-01T09:36:10+01:00

  Fix buglet in GHC.Core.Unify.uVarOrFam
  
  We were failing to match two totally-equal types!
  
  This led to #26457.
  

• 554487a7
  by Rodrigo Mesquita at 2025-10-01T23:04:43-04:00

  cleanup: Drop obsolete comment about HsConDetails
  
  HsConDetails used to have an argument representing the type of the
  tyargs in a list:
  
      data HsConDetails tyarg arg rec
        = PrefixCon [tyarg] [arg]
  
  This datatype was shared across 3 synonyms: HsConPatDetails,
  HsConDeclH98Details, HsPatSynDetails. In the latter two cases, `tyarg`
  was instanced to `Void` meaning the list was always empty for these
  cases.
  
  In 7b84c58867edca57a45945a20a9391724db6d9e4, this was refactored such
  that HsConDetails no longer needs a type of tyargs by construction. The
  first case now represents the type arguments in the args type itself,
  with something like:
  
      ConPat "MkE" [InvisP tp1, InvisP tp2, p1, p2]
  
  So the deleted comment really is just obsolete.
  
  Fixes #26461
  

• 6992ac09
  by Cheng Shao at 2025-10-02T07:27:55-04:00

  testsuite: remove unused expected output files
  
  This patch removes unused expected output files in the testsuites on
  platforms that we no longer support.
  

• 39eaaaba
  by Ben Gamari at 2025-10-02T07:28:45-04:00

  rts: Dynamically initialize built-in closures
  
  To resolve #26166 we need to eliminate references to undefined symbols
  in the runtime system. One such source of these is the runtime's
  static references to `I#` and `C#` due the `stg_INTLIKE` and
  `stg_CHARLIKE` arrays.
  
  To avoid this we make these dynamic, initializing them during RTS
  start-up.
  

• c254c54b
  by Cheng Shao at 2025-10-02T07:29:33-04:00

  compiler: only invoke keepCAFsForGHCi if internal-interpreter is enabled
  
  This patch makes the ghc library only invoke keepCAFsForGHCi if
  internal-interpreter is enabled. For cases when it's not (e.g. the
  host build of a cross ghc), this avoids unnecessarily retaining all
  CAFs in the heap. Also fixes the type signature of c_keepCAFsForGHCi
  to match the C ABI.
  

• c9ec4d43
  by Simon Hengel at 2025-10-02T18:42:20-04:00

  Update copyright in documentation
  

• da9633a9
  by Matthew Pickering at 2025-10-02T18:43:04-04:00

  loader: Unify loadDecls and loadModuleLinkables functions
  
  These two functions nearly did the same thing. I have refactored them so
  that `loadDecls` now calls `loadModuleLinkables`.
  
  Fixes #26459
  

• 5db98d80
  by Simon Hengel at 2025-10-02T18:43:53-04:00

  Fix typo

• 1275d360
  by Matthew Pickering at 2025-10-03T06:05:56-04:00

  testsuite: Use ghci_ways to set ways in PackedDataCon/UnboxedTuples/UnliftedDataTypeInterp tests
  
  These tests reimplemented the logic from `valid_way` in order to
  determine what ways to run. It's easier to use this combination of
  `only_ways` and `extra_ways` to only run in GHCi ways and always run in
  GHCi ways.
  

• c06b534b
  by Matthew Pickering at 2025-10-03T06:06:40-04:00

  Rename interpreterBackend to bytecodeBackend
  
  This is preparation for creating bytecode files.
  
  The "interpreter" is one way in which we can run bytecode objects. It is
  more accurate to describe that the backend produces bytecode, rather
  than the means by which the code will eventually run.
  
  The "interpreterBackend" binding is left as a deprecated alias.
  

• 41bdb16f
  by Andreas Klebinger at 2025-10-06T18:04:34-04:00

  Add a perf test for #26425
  

• 1da0c700
  by Andreas Klebinger at 2025-10-06T18:05:14-04:00

  Testsuite: Silence warnings about Wx-partial in concprog001
  

• 7471eb6a
  by sheaf at 2025-10-07T21:39:43-04:00

  Improve how we detect user type errors in types
  
  This commit cleans up all the code responsible for detecting whether a
  type contains "TypeError msg" applications nested inside it. All the
  logic is now in 'userTypeError_maybe', which is always deep. Whether
  it looks inside type family applications is determined by the passed-in
  boolean flag:
  
    - When deciding whether a constraint is definitely insoluble, don't
      look inside type family applications, as they may still reduce -- in
      which case the TypeError could disappear.
    - When reporting unsolved constraints, look inside type family
      applications: they had the chance to reduce but didn't, and the
      custom type error might contain valuable information.
  
  All the details are explained in Note [Custom type errors in constraints]
  in GHC.Tc.Types.Constraint.
  
  Another benefit of this change is that it allows us to get rid of the
  deeply dodgy 'getUserTypeErrorMsg' function.
  
  This commit also improves the detection of custom type errors, for
  example in equality constraints:
  
    TypeError blah ~# rhs
  
  It used to be the case that we didn't detect the TypeError on the LHS,
  because we never considered that equality constraints could be insoluble
  due to the presence of custom type errors. Addressing this oversight
  improves detection of redundant pattern match warnings, fixing #26400.
  

• 29955267
  by Rodrigo Mesquita at 2025-10-07T21:40:25-04:00

  cleanup: Drop obsolete settings from config.mk.in
  
  These values used to be spliced into the bindist's `config.mk` s.t. when
  `make` was run, the values were read and written into the bindist installation `settings` file.
  
  However, we now carry these values to the bindist directly in the
  default.target toolchain file, and `make` writes almost nothing to
  `settings` now (see #26227)
  
  The entries deleted in this MR were already unused.
  
  Fixes #26478
  

• f7adfed2
  by ARATA Mizuki at 2025-10-08T08:37:24-04:00

  T22033 is only relevant if the word size is 64-bit
  
  Fixes #25497
  

• ff1650c9
  by Ben Gamari at 2025-10-08T08:38:07-04:00

  rts/posix: Enforce iteration limit on heap reservation logic
  
  Previously we could loop indefinitely when attempting to get an address
  space reservation for our heap. Limit the logic to 8 iterations to
  ensure we instead issue a reasonable error message.
  
  Addresses #26151.
  

• 01844557
  by Ben Gamari at 2025-10-08T08:38:07-04:00

  rts/posix: Hold on to low reservations when reserving heap
  
  Previously when the OS gave us an address space reservation in low
  memory we would immediately release it and try again. However, on some
  platforms this meant that we would get the same allocation again in the
  next iteration (since mmap's `hint` argument is just that, a hint).
  
  Instead we now hold on to low reservations until we have found a
  suitable heap reservation.
  
  Fixes #26151.
  

• b2c8d052
  by Sven Tennie at 2025-10-08T08:38:47-04:00

  Build terminfo only in upper stages in cross-builds (#26288)
  
  Currently, there's no way to provide library paths for [n]curses for
  both - build and target - in cross-builds. As stage0 is only used to
  build upper stages, it should be fine to build terminfo only for them.
  
  This re-enables building cross-compilers with terminfo.
  

• c58f9a61
  by Julian Ospald at 2025-10-08T08:39:36-04:00

  ghc-toolchain: Drop `ld.gold` from merge object command
  
  It's deprecated.
  
  Also see #25716
  

• 2b8baada
  by sheaf at 2025-10-08T18:23:37-04:00

  Improvements to 'mayLookIdentical'
  
  This commit makes significant improvements to the machinery that decides
  when we should pretty-print the "invisible bits" of a type, such as:
  
    - kind applications, e.g. '@k' in 'Proxy @k ty'
    - RuntimeReps, e.g. 'TYPE r'
    - multiplicities and linear arrows 'a %1 -> b'
  
  To do this, this commit refactors 'mayLookIdentical' to return **which**
  of the invisible bits don't match up, e.g. in
  
    (a %1 -> b) ~ (a %Many -> b)
  
  we find that the invisible bit that doesn't match up is a multiplicity,
  so we should set 'sdocLinearTypes = True' when pretty-printing, and with
  e.g.
  
    Proxy @k1 ~ Proxy @k2
  
  we find that the invisible bit that doesn't match up is an invisible
  TyCon argument, so we set 'sdocPrintExplicitKinds = True'.
  
  We leverage these changes to remove the ad-hoc treatment of linearity
  of data constructors with 'dataConDisplayType' and 'dataConNonLinearType'.
  This is now handled by the machinery of 'pprWithInvisibleBits'.
  
  Fixes #26335 #26340
  

• 129ce32d
  by sheaf at 2025-10-08T18:23:37-04:00

  Store SDoc context in SourceError
  
  This commits modifies the SourceError datatype which is used for
  throwing and then reporting exceptions by storing all the info we need
  to be able to print the SDoc, including whether we should print with
  explicit kinds, explicit runtime-reps, etc.
  
  This is done using the new datatype:
  
    data SourceErrorContext
      = SEC
          !DiagOpts
          !(DiagnosticOpts GhcMessage)
  
  Now, when we come to report an error (by handling the exception), we
  have access to the full context we need.
  
  Fixes #26387
  

• f9790ca8
  by Ben Gamari at 2025-10-08T18:24:19-04:00

  gitlab-ci: Make RELEASE_JOB an input
  
  Rather than an undocumented variable.
  

• 14281a22
  by Ben Gamari at 2025-10-11T14:06:47-04:00

  rts/nonmoving: Fix comment spelling
  

• bedd38b0
  by Ben Gamari at 2025-10-11T14:06:47-04:00

  rts/nonmoving: Use atomic operations to update bd->flags
  

• 215d6841
  by Ben Gamari at 2025-10-11T14:06:47-04:00

  nonmoving: Use get_itbl instead of explicit loads
  
  This is cleaner and also fixes unnecessary (and unsound) use of
  `volatile`.
  

• 2c94aa3a
  by Ben Gamari at 2025-10-11T14:06:47-04:00

  rts/Scav: Handle WHITEHOLEs in scavenge_one
  
  `scavenge_one`, used to scavenge mutable list entries, may encounter
  `WHITEHOLE`s when the non-moving GC is in use via two paths:
  
    1. when an MVAR is being marked concurrently
    2. when the object belongs to a chain of selectors being short-cutted.
  
  Fixes #26204.
  

• 6bd8155c
  by Matthew Pickering at 2025-10-11T14:07:29-04:00

  Add support for generating bytecode objects
  
  This commit adds the `-fwrite-byte-code` option which makes GHC emit a
  `.gbc` file which contains a serialised representation of bytecode.
  
  The bytecode can be loaded by the compiler to avoid having to
  reinterpret a module when using the bytecode interpreter (for example,
  in GHCi).
  
  There are also the new options:
  
  * -gbcdir=<DIR>: Specify the directory to place the gbc files
  * -gbcsuf=<suffix>: Specify the suffix for gbc files
  
  The option `-fbyte-code-and-object-code` now implies
  `-fwrite-byte-code`.
  
  These performance tests fail due to https://github.com/haskell/directory/issues/204
  
  -------------------------
  Metric Increase:
      MultiComponentModules
      MultiLayerModules
      MultiComponentModulesRecomp
      MultiLayerModulesRecomp
      MultiLayerModulesTH_Make
      MultiLayerModulesTH_OneShot
      T13701
  -------------------------
  
  The bytecode serialisation part was implemented by Cheng Shao
  
  Co-authored-by: Cheng Shao <terrorjack@type.dance>
  

• dc8f9599
  by Matthew Pickering at 2025-10-11T14:07:30-04:00

  Revert "Add a perf test for #26425"
  
  This test has a large memory spike currently, which makes the test
  sensitive, since if you allocate a little more or less, the precise
  location where GC happens shifts and you observe a different part of the
  spike.
  
  Andreas told me to revert the patch for now, and he will add it back
  when he fixes the memory spike.
  
  This reverts commit 41bdb16fd083110a06507248f648c507a2feb4af.
  

• e10dcd65
  by Sven Tennie at 2025-10-12T10:24:56+00:00

  T22859: Increase threadDelay for small machines
  
  The previously used thread delay led to failures on my RISC-V test
  setups.
  

• d59ef6b6
  by Hai / @BestYeen at 2025-10-14T21:51:14-04:00

  Change Alex and Happy m4 scripts to display which version was found in the system, adapt small formatting details in Happy script to be more like the Alex script again.

• c98abb6a
  by Hai / @BestYeen at 2025-10-14T21:52:08-04:00

  Update occurrences of return to pure and add a sample for redefining :m to mean :main

• 70ee825a
  by Cheng Shao at 2025-10-14T21:52:50-04:00

  testsuite: fix T3586 for non-SSE3 platforms
  
  `T3586.hs` contains `-fvia-C -optc-msse3` which I think is a
  best-effort basis to harvest the C compiler's auto vectorization
  optimizations via the C backend back when the test was added. The
  `-fvia-C` part is now a deprecated no-op because GHC can't fall back
  to the C backend on a non-unregisterised build, and `-optc-msse3`
  might actually cause the test to fail on non x86/x64 platforms, e.g.
  recent builds of wasi-sdk would report `wasm32-wasi-clang: error:
  unsupported option '-msse3' for target 'wasm32-unknown-wasi'`.
  
  So this patch cleans up this historical cruft. `-fvia-C` is removed,
  and `-optc-msse3` is only passed when cpuid contains `pni` (which
  indicates support of SSE3).
  

• 4be32153
  by Teo Camarasu at 2025-10-15T08:06:09-04:00

  Add submodules for template-haskell-lift and template-haskell-quasiquoter
  
  These two new boot libraries expose stable subsets of the
  template-haskell interface.
  
  This is an implemenation of the GHC proposal https://github.com/ghc-proposals/ghc-proposals/pull/696
  
  Work towards #25262
  

• 0c00c9c3
  by Ben Gamari at 2025-10-15T08:06:51-04:00

  rts: Eliminate uses of implicit constant arrays
  
  Folding of `const`-sized variable-length arrays to a constant-length
  array is a gnu extension which clang complains about.
  
  Closes #26502.
  

• bf902a1d
  by Fendor at 2025-10-15T16:00:59-04:00

  Refactor distinct constructor tables map construction
  
  Adds `GHC.Types.Unique.FM.alterUFM_L`, `GHC.Types.Unique.DFM.alterUDFM_L`
  `GHC.Data.Word64Map.alterLookup` to support fusion of distinct
  constructor data insertion and lookup during the construction of the `DataCon`
  map in `GHC.Stg.Debug.numberDataCon`.
  
  Co-authored-by: Fendor <fendor@posteo.de>
  Co-authored-by: Finley McIlwaine <finleymcilwaine@gmail.com>
  

• b3585ba1
  by Fendor at 2025-10-15T16:00:59-04:00

  Allow per constructor refinement of distinct-constructor-tables
  
  Introduce `-fno-distinct-constructor-tables`. A distinct constructor table
  configuration is built from the combination of flags given, in order. For
  example, to only generate distinct constructor tables for a few specific
  constructors and no others, just pass
  `-fdistinct-constructor-tables-only=C1,...,CN`.
  This flag can be supplied multiple times to extend the set of
  constructors to generate a distinct info table for.
  
  You can disable generation of distinct constructor tables for all
  configurations by passing `-fno-distinct-constructor-tables`.
  
  The various configurations of these flags is included in the `DynFlags`
  fingerprints, which should result in the expected recompilation logic.
  
  Adds a test that checks for distinct tables for various given or omitted
  constructors.
  
  Updates CountDepsAst and CountDepsParser tests to account for new dependencies.
  
  Fixes #23703
  
  Co-authored-by: Fendor <fendor@posteo.de>
  Co-authored-by: Finley McIlwaine <finleymcilwaine@gmail.com>
  

• e17dc695
  by fendor at 2025-10-15T16:01:41-04:00

  Fix typos in haddock documentation for stack annotation API
  

• f85058d3
  by Zubin Duggal at 2025-10-17T13:50:52+05:30

  compiler: Attempt to systematize Unique tags by introducing an ADT for each different tag
  
  Fixes #26264
  
  Metric Decrease:
      T9233
  

• c85c845d
  by sheaf at 2025-10-17T22:35:32-04:00

  Don't prematurely final-zonk PatSyn declarations
  
  This commit makes GHC hold off on the final zonk for pattern synonym
  declarations, in 'GHC.Tc.TyCl.PatSyn.tc_patsyn_finish'.
  This accommodates the fact that pattern synonym declarations without a
  type signature can contain unfilled metavariables, e.g. if the RHS of
  the pattern synonym involves view-patterns whose type mentions promoted
  (level 0) metavariables. Just like we do for ordinary function bindings,
  we should allow these metavariables to be settled later, instead of
  eagerly performing a final zonk-to-type.
  
  Now, the final zonking-to-type for pattern synonyms is performed in
  GHC.Tc.Module.zonkTcGblEnv.
  
  Fixes #26465
  

• ba3e5bdd
  by Rodrigo Mesquita at 2025-10-18T16:57:18-04:00

  Move code-gen aux symbols from ghc-internal to rts
  
  These symbols were all previously defined in ghc-internal and made the
  dependency structure awkward, where the rts may refer to some of these
  symbols and had to work around that circular dependency the way
  described in #26166.
  
  Moreover, the code generator will produce code that uses these symbols!
  Therefore, they should be available in the rts:
  
  PRINCIPLE: If the code generator may produce code which uses this
  symbol, then it should be defined in the rts rather than, say,
  ghc-internal.
  
  That said, the main motivation is towards fixing #26166.
  
  Towards #26166. Pre-requisite of !14892
  

• f31de2a9
  by Ben Gamari at 2025-10-18T16:57:18-04:00

  rts: Avoid static symbol references to ghc-internal
  
  This resolves #26166, a bug due to new constraints placed by Apple's
  linker on undefined references.
  
  One source of such references in the RTS is the many symbols referenced
  in ghc-internal. To mitigate #26166, we make these references dynamic,
  as described in Note [RTS/ghc-internal interface].
  
  Fixes #26166
  
  Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>
  Co-authored-by: Cheng Shao <terrorjack@type.dance>
  

• 43fdfddc
  by Ben Gamari at 2025-10-18T16:57:18-04:00

  compiler: Rename isMathFun -> isLibcFun
  
  This set includes more than just math functions.
  

• 4ed5138f
  by Ben Gamari at 2025-10-18T16:57:18-04:00

  compiler: Add libc allocator functions to libc_funs
  
  Prototypes for these are now visible from `Prim.h`, resulting in
  multiple-declaration warnings in the unregisterised job.
  

• 9a0a076b
  by Ben Gamari at 2025-10-18T16:57:18-04:00

  rts: Minimize header dependencies of Prim.h
  
  Otherwise we will end up with redundant and incompatible declarations
  resulting in warnings during the unregisterised build.
  

• 26b8a414
  by Diego Antonio Rosario Palomino at 2025-10-18T16:58:10-04:00

  Cmm Parser: Fix incorrect example in comment
  
  The Parser.y file contains a comment with an incorrect example of textual
  Cmm (used in .cmm files). This commit updates the comment to ensure it
  reflects valid textual Cmm syntax.
  
  Fixes #26313
  

• d4a9d6d6
  by ARATA Mizuki at 2025-10-19T18:43:47+09:00

  Handle implications between x86 feature flags
  
  This includes:
  
  * Multiple -msse* options can be specified
  * -mavx implies -msse4.2
  * -mavx2 implies -mavx
  * -mfma implies -mavx
  * -mavx512f implies -mavx2 and -mfma
  * -mavx512{cd,er,pf} imply -mavx512f
  
  Closes #24989
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• c9b8465c
  by Cheng Shao at 2025-10-20T10:16:00-04:00

  wasm: workaround WebKit bug in dyld
  
  This patch works around a WebKit bug and allows dyld to run on WebKit
  based platforms as well. See added note for detailed explanation.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 91b6be10
  by Julian Ospald at 2025-10-20T18:21:03-04:00

  Improve error handling in 'getPackageArchives'
  
  When the library dirs in the package conf files are not set up correctly,
  the JS linker will happily ignore such packages and not link against them,
  although they're part of the link plan.
  
  Fixes #26383
  

• 6c5269da
  by Sven Tennie at 2025-10-20T18:21:44-04:00

  Align coding style
  
  Improve readability by using the same style for all constructor calls in
  this function.
  

• 3d305889
  by Sven Tennie at 2025-10-20T18:21:44-04:00

  Reduce complexity by removing joins with mempty
  
  ldArgs, cArgs and cppArgs are all `mempty`. Thus concatenating them adds
  nothing but some complexity while reading the code.
  

• 38d65187
  by Matthew Pickering at 2025-10-21T13:12:20+01:00

  Fix stack decoding when using profiled runtime
  
  There are three fixes in this commit.
  
  * We need to replicate the `InfoTable` and `InfoTableProf`
  approach for the other stack constants (see the new Stack.ConstantsProf
  file).
  
  * Then we need to appropiately import the profiled or non-profiled
    versions.
  
  * Finally, there was an incorrect addition in `stackFrameSize`. We need
    to cast after performing addition on words.
  
  Fixes #26507
  

• 17231bfb
  by fendor at 2025-10-21T13:12:20+01:00

  Add regression test for #26507
  

• 4f5bf93b
  by Simon Peyton Jones at 2025-10-25T04:05:34-04:00

  Postscript to fix for #26255
  
  This MR has comments only
  

• 6ef22fa0
  by IC Rainbow at 2025-10-26T18:23:01-04:00

  Add SIMD primops for bitwise logical operations
  
  This adds 128-bit wide and/or/xor instructions for X86 NCG,
  with both SSE and AVX encodings.
  
  ```
  andFloatX4# :: FloatX4# -> FloatX4# -> FloatX4#     -- andps / vandps
  andDoubleX2# :: DoubleX2# -> DoubleX2# -> DoubleX2# -- andpd / vandpd
  andInt8X16# :: Int8X16# -> Int8X16# -> Int8X16#     -- pand / vpand
  ```
  
  The new primops are available on ARM when using LLVM backend.
  
  Tests added:
  - simd015 (floats and doubles)
  - simd016 (integers)
  - simd017 (words)
  
  Fixes #26417
  

• fbdc623a
  by sheaf at 2025-10-26T18:23:52-04:00

  Add hints for unsolved HasField constraints
  
  This commit adds hints and explanations for unsolved 'HasField'
  constraints.
  
  GHC will now provide additional explanations for an unsolved constraint
  of the form 'HasField fld_name rec_ty fld_ty'; the details are laid out in
  Note [Error messages for unsolved HasField constraints], but briefly:
  
    1. Provide similar name suggestions (e.g. mis-spelled field name)
       and import suggestions (record field not in scope).
       These result in actionable 'GhcHints', which is helpful to provide
       code actions in HLS.
  
    2. Explain why GHC did not solve the constraint, e.g.:
  
      - 'fld_name' is not a string literal (e.g. a type variable)
      - 'rec_ty' is a TyCon without any fields, e.g. 'Int' or 'Bool'.
      - 'fld_ty' contains existentials variables or foralls.
      - The record field is a pattern synonym field (GHC does not generate
        HasField instances for those).
      - 'HasField' is a custom 'TyCon', not actually the built-in
        'HasField' typeclass from 'GHC.Records'.
  
  On the way, we slightly refactor the mechanisms for import suggestions
  in GHC.Rename.Unbound. This is to account for the fact that, for
  'HasField', we don't care whether the field is imported qualified or
  unqualified. 'importSuggestions' was refactored, we now have
  'sameQualImportSuggestions' and 'anyQualImportSuggestions'.
  
  Fixes #18776 #22382 #26480
  

• 99d5707f
  by sheaf at 2025-10-26T18:23:52-04:00

  Rename PatSyn MatchContext to PatSynCtx to avoid punning
  

• 5dc2e9ea
  by Julian Ospald at 2025-10-27T18:17:23-04:00

  Skip uniques test if sources are not available
  

• 544b9ec9
  by Vladislav Zavialov at 2025-10-27T18:18:06-04:00

  Re-export GHC.Hs.Basic from GHC.Hs
  
  Clean up some import sections in GHC by re-exporting GHC.Hs.Basic
  from GHC.Hs.
  

• 643ce801
  by Julian Ospald at 2025-10-28T18:18:55-04:00

  rts: remove unneccesary cabal flags
  
  We perform those checks via proper autoconf macros
  instead that do the right thing and then add those
  libs to the rts buildinfo.
  

• d69ea8fe
  by Vladislav Zavialov at 2025-10-28T18:19:37-04:00

  Test case for #17705
  
  Starting with GHC 9.12 (the first release to include 5745dbd3),
  all examples in this ticket are handled as expected.
  

• 4038a28b
  by Andreas Klebinger at 2025-10-30T12:38:52-04:00

  Add a perf test for #26425
  

• f997618e
  by Andreas Klebinger at 2025-10-30T12:38:52-04:00

  OccAnal: Be stricter for better compiler perf.
  
  In particular we are now stricter:
  
  * When combining usageDetails.
  * When computing binder info.
  
  In combineUsageDetails when combining the underlying adds we compute a
  new `LocalOcc` for each entry by combining the two existing ones.
  
  Rather than wait for those entries to be forced down the road we now
  force them immediately. Speeding up T26425 by about 10% with little
  effect on the common case.
  
  We also force binders we put into the Core AST everywhere now.
  Failure to do so risks leaking the occ env used to set the binders
  OccInfo.
  
  For T26425 compiler residency went down by a factor of ~10x.
  
  Compile time also improved by a factor of ~1.6.
  
  -------------------------
  Metric Decrease:
      T18698a
      T26425
      T9233
  -------------------------
  

• 5618645b
  by Vladislav Zavialov at 2025-10-30T12:39:33-04:00

  Fix namespace specifiers in subordinate exports (#12488)
  
  This patch fixes an oversight in the `lookupChildrenExport` function that
  caused explicit namespace specifiers of subordinate export items to be
  ignored:
  
    module M (T (type A)) where   -- should be rejected
    data T = A
  
  Based on the `IEWrappedName` data type, there are 5 cases to consider:
  1. Unadorned name:   P(X)
  2. Named default:    P(default X)
  3. Pattern synonym:  P(pattern X)
  4. Type name:        P(type X)
  5. Data name:        P(data X)
  
  Case 1 is already handled correctly; cases 2 and 3 are parse errors; and
  it is cases 4 and 5 that we are concerned with in this patch.
  
  Following the precedent established in `LookupExactName`, we introduce
  a boolean flag in `LookupChildren` to control whether to look up in all
  namespaces or in a specific one. If an export item is accompanied by an
  explicit namespace specifier `type` or `data`, we restrict the lookup in
  `lookupGRE` to a specific namespace.
  
  The newly introduced diagnostic `TcRnExportedSubordinateNotFound`
  provides error messages and suggestions more tailored to this context
  than the previously used `reportUnboundName`.
  

• f75ab223
  by Peter Trommler at 2025-10-31T18:43:13-04:00

  ghc-toolchain: detect PowerPC 64 bit ABI
  
  Check preprocessor macro defined for ABI v2 and assume v1 otherwise.
  Fixes #26521
  

• d086c474
  by Peter Trommler at 2025-10-31T18:43:13-04:00

  ghc-toolchain: refactor, move lastLine to Utils
  

• 995dfe0d
  by Vladislav Zavialov at 2025-10-31T18:43:54-04:00

  Tests for -Wduplicate-exports, -Wdodgy-exports
  
  Add test cases for the previously untested diagnostics:
  
    [GHC-51876] TcRnDupeModuleExport
    [GHC-64649] TcRnNullExportedModule
  
  This also revealed a typo (incorrect capitalization of "module") in the
  warning text for TcRnDupeModuleExport, which is now fixed.
  

• f6961b02
  by Cheng Shao at 2025-11-01T00:08:01+01:00

  wasm: reformat dyld source code
  
  This commit reformats dyld source code with prettier, to avoid
  introducing unnecessary diffs in subsequent patches when they're
  formatted before committing.
  

• 0c9032a0
  by Cheng Shao at 2025-11-01T00:08:01+01:00

  wasm: simplify _initialize logic in dyld
  
  This commit simplifies how we _initialize a wasm shared library in
  dyld and removes special treatment for libc.so, see added comment for
  detailed explanation.
  

• ec1b40bd
  by Cheng Shao at 2025-11-01T00:08:01+01:00

  wasm: support running dyld fully client side in the browser
  
  This commit refactors the wasm dyld script so that it can be used to
  load and run wasm shared libraries fully client-side in the browser
  without needing a wasm32-wasi-ghci backend:
  
  - A new `DyLDBrowserHost` class is exported, which runs in the browser
    and uses the in-memory vfs without any RPC calls. This meant to be
    used to create a `rpc` object for the fully client side use cases.
  - The exported `main` function now can be used to load user-specified
    shared libraries, and the user can use the returned `DyLD` instance
    to run their own exported Haskell functions.
  - The in-browser wasi implementation is switched to
    https://github.com/haskell-wasm/browser_wasi_shim for bugfixes and
    major performance improvements not landed upstream yet.
  - When being run by deno, it now correctly switches to non-nodejs code
    paths, so it's more convenient to test dyld logic with deno.
  
  See added comments for details, as well as the added `playground001`
  test case for an example of using it to build an in-browser Haskell
  playground.
  

• 8f3e481f
  by Cheng Shao at 2025-11-01T00:08:01+01:00

  testsuite: add playground001 to test haskell playground
  
  This commit adds the playground001 test case to test the haskell
  playground in browser, see comments for details.
  

• af40606a
  by Cheng Shao at 2025-11-01T00:08:04+01:00

  Revert "testsuite: add T26431 test case"
  
  This reverts commit 695036686f8c6d78611edf3ed627608d94def6b7. T26431
  is now retired, wasm ghc internal-interpreter logic is tested by
  playground001.
  

• 86c82745
  by Vladislav Zavialov at 2025-11-01T07:24:29-04:00

  Supplant TcRnExportHiddenComponents with TcRnDodgyExports (#26534)
  
  Remove a bogus special case in lookup_ie_kids_all,
  making TcRnExportHiddenComponents obsolete.
  

• fcf6331e
  by Richard Eisenberg at 2025-11-03T08:33:05+00:00

  Refactor fundep solving
  
  This commit is a large-scale refactor of the increasingly-messy code that
  handles functional dependencies.  It has virtually no effect on what compiles
  but improves error messages a bit.  And it does the groundwork for #23162.
  
  The big picture is described in
      Note [Overview of functional dependencies in type inference]
  in GHC.Tc.Solver.FunDeps
  
  * New module GHC.Tc.Solver.FunDeps contains all the fundep-handling
    code for the constraint solver.
  
  * Fundep-equalities are solved in a nested scope; they may generate
    unifications but otherwise have no other effect.
    See GHC.Tc.Solver.FunDeps.solveFunDeps
  
    The nested needs to start from the Givens in the inert set, but
    not the Wanteds; hence a new function `resetInertCans`, used in
    `nestFunDepsTcS`.
  
  * That in turn means that fundep equalities never show up in error
    messages, so the complicated FunDepOrigin tracking can all disappear.
  
  * We need to be careful about tracking unifications, so we kick out
    constraints from the inert set after doing unifications.  Unification
    tracking has been majorly reformed: see Note [WhatUnifications] in
    GHC.Tc.Utils.Unify.
  
    A good consequence is that the hard-to-grok `resetUnificationFlag`
    has been replaced with a simpler use of
    `reportCoarseGrainUnifications`
  
  Smaller things:
  
  * Rename `FunDepEqn` to `FunDepEqns` since it contains multiple
    type equalities.
  
  Some compile time improvement
  
  Metrics: compile_time/bytes allocated
                            Baseline
                    Test       value      New value Change
  ---------------------- --------------------------------------
           T5030(normal) 173,839,232    148,115,248 -14.8% GOOD
  hard_hole_fits(normal) 286,768,048    284,015,416  -1.0%
  
               geo. mean                             -0.2%
               minimum                              -14.8%
               maximum                               +0.3%
  
  Metric Decrease:
      T5030
  

• 231adc30
  by Simon Peyton Jones at 2025-11-03T08:33:05+00:00

  QuickLook's tcInstFun should make instantiation variables directly
  
  tcInstFun must make "instantiation variables", not regular
  unification variables, when instantiating function types. That was
  previously implemented by a hack: set the /ambient/ level to QLInstTyVar.
  
  But the hack finally bit me, when I was refactoring WhatUnifications.
  And it was always wrong: see the now-expunged (TCAPP2) note.
  
  This commit does it right, by making tcInstFun call its own
  instantiation functions.  That entails a small bit of duplication,
  but the result is much, much cleaner.
  

• 39d4a24b
  by Simon Peyton Jones at 2025-11-03T08:33:05+00:00

  Build implication for constraints from (static e)
  
  This commit addresses #26466, by buiding an implication for the
  constraints arising from a (static e) form.  The implication has
  a special ic_info field of StaticFormSkol, which tells the constraint
  solver to use an empty set of Givens.
  
  See (SF3) in Note [Grand plan for static forms]
  in GHC.Iface.Tidy.StaticPtrTable
  
  This commit also reinstates an `assert` in GHC.Tc.Solver.Equality.
  
  The test `StaticPtrTypeFamily` was failing with an assertion failure,
  but it now works.
  

• 2e2aec1e
  by Simon Peyton Jones at 2025-11-03T08:33:05+00:00

  Comments about defaulting representation equalities
  

• 52a4d1da
  by Simon Peyton Jones at 2025-11-03T08:33:05+00:00

  Improve tracking of rewriter-sets
  
  This refactor substantially improves the treatment of so-called
  "rewriter-sets" in the constraint solver.
  
  The story is described in the rewritten
     Note [Wanteds rewrite Wanteds: rewriter-sets]
  in GHC.Tc.Types.Constraint
  
  Some highlights
  
  * Trace the free coercion holes of a filled CoercionHole,
    in CoercionPlusHoles.  See Note [Coercion holes] (COH5)
  
    This avoids taking having to take the free coercion variables
    of a coercion when zonking a rewrriter-set
  
  * Many knock on changes
      * Make fillCoercionHole take CoercionPlusHoles as its argument
        rather than to separate arguments.
  
      * Similarly setEqIfWanted, setWantedE, wrapUnifierAndEmit.
  
      * Be more careful about passing the correct CoHoleSet to
        `rewriteEqEvidence` and friends
  
  * Make kickOurAfterFillingCoercionHole more clever. See
    new Note [Kick out after filling a coercion hole]
  
  Smaller matters
  
  * Rename RewriterSet to CoHoleSet
  * Add special-case helper `rewriteEqEvidenceSwapOnly`
  

• 3e78e1ba
  by Simon Peyton Jones at 2025-11-03T08:33:05+00:00

  Tidy up constraint solving for foralls
  
  * In `can_eq_nc_forall` make sure to track Givens that are used
    in the nested solve step.
  
  * Tiny missing-swap bug-fix in `lookup_eq_in_qcis`
  
  * Fix some leftover mess from
        commit 14123ee646f2b9738a917b7cec30f9d3941c13de
        Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
        Date:   Wed Aug 20 00:35:48 2025 +0100
        Solve forall-constraints via an implication, again
    Specifically, trySolveImplication is now dead.
  

• 973f2c25
  by Simon Peyton Jones at 2025-11-03T08:33:05+00:00

  Do not treat CoercionHoles as free variables in coercions
  
  This fixes a long-standing wart in the free-variable finder;
  now CoercionHoles are no longer treated as a "free variable"
  of a coercion.
  
  I got big and unexpected performance regressions when making
  this change.  Turned out that CallArity didn't discover that
  the free variable finder could be eta-expanded, which gave very
  poor code.
  
  So I re-used Note [The one-shot state monad trick] for Endo,
  resulting in GHC.Utils.EndoOS.  Very simple, big win.
  

• c2b8a0f9
  by Simon Peyton Jones at 2025-11-03T08:33:05+00:00

  Update debug-tracing in CallArity
  
  No effect on behaviour, and commented out anyway
  

• 9aa5ee99
  by Simon Peyton Jones at 2025-11-03T08:33:28+00:00

  Comments only -- remove dangling Note references
  

• 6683f183
  by Simon Peyton Jones at 2025-11-03T08:33:28+00:00

  Accept error message wibbles
  

• 3ba3d9f9
  by Luite Stegeman at 2025-11-04T00:59:41-05:00

  rts: fix eager black holes: record mutated closure and fix assertion
  
  This fixes two problems with handling eager black holes, introduced
  by a1de535f762bc23d4cf23a5b1853591dda12cdc9.
  
  - the closure mutation must be recorded even for eager black holes,
    since the mutator has mutated it before calling threadPaused
  
  - The assertion that an unmarked eager black hole must be owned by
    the TSO calling threadPaused is incorrect, since multiple threads
    can race to claim the black hole.
  
  fixes #26495
  

• c073b1e6
  by Zubin Duggal at 2025-11-05T15:30:18+05:30

  compiler: store z-encoded versions of FastStrings in a seperate table
  
  So we don't need to store an extra word for FastStrings which are never
  z-encoded.
  

• ed929e68
  by Zubin Duggal at 2025-11-05T15:30:19+05:30

  wip
  

• f22e7051
  by Zubin Duggal at 2025-11-05T15:30:19+05:30

  fixes
  

• 162b6d41
  by Zubin Duggal at 2025-11-05T15:30:19+05:30

  wip
  

• 67d52501
  by Zubin Duggal at 2025-11-05T15:30:19+05:30

  wip
  

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• compiler/CodeGen.Platform.h
• compiler/GHC.hs
• compiler/GHC/Builtin/Names.hs
• compiler/GHC/Builtin/Names/TH.hs
• compiler/GHC/Builtin/PrimOps.hs
• compiler/GHC/Builtin/PrimOps/Ids.hs
• compiler/GHC/Builtin/Types.hs
• compiler/GHC/Builtin/Types/Literals.hs
• compiler/GHC/Builtin/Types/Prim.hs
• compiler/GHC/Builtin/Uniques.hs
• compiler/GHC/Builtin/Utils.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• + compiler/GHC/ByteCode/Breakpoints.hs
• compiler/GHC/ByteCode/InfoTable.hs
• compiler/GHC/ByteCode/Instr.hs
• compiler/GHC/ByteCode/Linker.hs
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• compiler/GHC/ByteCode/Types.hs
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• compiler/GHC/Cmm/CLabel.hs
• compiler/GHC/Cmm/CallConv.hs
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• compiler/GHC/Cmm/ThreadSanitizer.hs
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• + compiler/GHC/CmmToAsm/RV64.hs
• + compiler/GHC/CmmToAsm/RV64/CodeGen.hs
• + compiler/GHC/CmmToAsm/RV64/Cond.hs
• + compiler/GHC/CmmToAsm/RV64/Instr.hs
• + compiler/GHC/CmmToAsm/RV64/Ppr.hs
• + compiler/GHC/CmmToAsm/RV64/RegInfo.hs
• + compiler/GHC/CmmToAsm/RV64/Regs.hs
• compiler/GHC/CmmToAsm/Reg/Graph.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Base.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Coalesce.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Spill.hs
• compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
• compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Stats.hs
• compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
• compiler/GHC/CmmToAsm/Reg/Linear.hs
• compiler/GHC/CmmToAsm/Reg/Linear/AArch64.hs
• compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
• compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs
• compiler/GHC/CmmToAsm/Reg/Linear/JoinToTargets.hs
• + compiler/GHC/CmmToAsm/Reg/Linear/LA64.hs
• compiler/GHC/CmmToAsm/Reg/Linear/PPC.hs
• + compiler/GHC/CmmToAsm/Reg/Linear/RV64.hs
• compiler/GHC/CmmToAsm/Reg/Linear/StackMap.hs
• compiler/GHC/CmmToAsm/Reg/Linear/State.hs
• compiler/GHC/CmmToAsm/Reg/Linear/Stats.hs
• compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
• compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
• compiler/GHC/CmmToAsm/Reg/Liveness.hs
• compiler/GHC/CmmToAsm/Reg/Target.hs
• compiler/GHC/CmmToAsm/Wasm.hs
• compiler/GHC/CmmToAsm/Wasm/Asm.hs
• compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
• compiler/GHC/CmmToAsm/Wasm/Types.hs
• compiler/GHC/CmmToAsm/X86/CodeGen.hs
• compiler/GHC/CmmToAsm/X86/Instr.hs
• compiler/GHC/CmmToAsm/X86/Ppr.hs
• compiler/GHC/CmmToAsm/X86/RegInfo.hs
• compiler/GHC/CmmToAsm/X86/Regs.hs
• compiler/GHC/CmmToC.hs
• compiler/GHC/CmmToLlvm.hs
• compiler/GHC/CmmToLlvm/Base.hs
• compiler/GHC/CmmToLlvm/CodeGen.hs
• compiler/GHC/CmmToLlvm/Data.hs
• compiler/GHC/CmmToLlvm/Regs.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Class.hs
• compiler/GHC/Core/Coercion.hs
• compiler/GHC/Core/Coercion.hs-boot
• compiler/GHC/Core/Coercion/Axiom.hs
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/ConLike.hs
• compiler/GHC/Core/DataCon.hs
• compiler/GHC/Core/DataCon.hs-boot
• compiler/GHC/Core/FVs.hs
• compiler/GHC/Core/FamInstEnv.hs
• compiler/GHC/Core/InstEnv.hs
• compiler/GHC/Core/LateCC/OverloadedCalls.hs
• compiler/GHC/Core/LateCC/TopLevelBinds.hs
• compiler/GHC/Core/Lint.hs
• compiler/GHC/Core/Make.hs
• compiler/GHC/Core/Map/Expr.hs
• compiler/GHC/Core/Map/Type.hs
• compiler/GHC/Core/Multiplicity.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/CSE.hs
• compiler/GHC/Core/Opt/CallArity.hs
• compiler/GHC/Core/Opt/CallerCC/Types.hs
• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/CprAnal.hs
• compiler/GHC/Core/Opt/DmdAnal.hs
• compiler/GHC/Core/Opt/FloatIn.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/OccurAnal.hs
• compiler/GHC/Core/Opt/Pipeline.hs
• compiler/GHC/Core/Opt/Pipeline/Types.hs
• compiler/GHC/Core/Opt/SetLevels.hs
• compiler/GHC/Core/Opt/Simplify.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Inline.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Monad.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/StaticArgs.hs
• compiler/GHC/Core/Opt/WorkWrap.hs
• compiler/GHC/Core/Opt/WorkWrap/Utils.hs
• compiler/GHC/Core/PatSyn.hs
• compiler/GHC/Core/Ppr.hs
• compiler/GHC/Core/Predicate.hs
• compiler/GHC/Core/Reduction.hs
• compiler/GHC/Core/Rules.hs
• compiler/GHC/Core/Rules/Config.hs
• compiler/GHC/Core/SimpleOpt.hs
• compiler/GHC/Core/Subst.hs
• compiler/GHC/Core/Tidy.hs
• compiler/GHC/Core/TyCo/Compare.hs
• compiler/GHC/Core/TyCo/FVs.hs
• compiler/GHC/Core/TyCo/Ppr.hs
• compiler/GHC/Core/TyCo/Rep.hs
• compiler/GHC/Core/TyCo/Rep.hs-boot
• compiler/GHC/Core/TyCo/Subst.hs
• compiler/GHC/Core/TyCo/Tidy.hs
• compiler/GHC/Core/TyCon.hs
• compiler/GHC/Core/TyCon.hs-boot
• compiler/GHC/Core/TyCon/Env.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Type.hs-boot
• compiler/GHC/Core/Unfold.hs
• compiler/GHC/Core/Unfold/Make.hs
• compiler/GHC/Core/Unify.hs
• compiler/GHC/Core/UsageEnv.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToIface.hs
• compiler/GHC/CoreToStg.hs
• + compiler/GHC/CoreToStg/AddImplicitBinds.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/Bag.hs
• compiler/GHC/Data/BooleanFormula.hs
• compiler/GHC/Data/FastString.hs
• compiler/GHC/Data/FastString/Env.hs
• compiler/GHC/Data/FlatBag.hs
• compiler/GHC/Data/Graph/Collapse.hs
• compiler/GHC/Data/Graph/Color.hs
• compiler/GHC/Data/Graph/Directed.hs
• + compiler/GHC/Data/Graph/Directed/Internal.hs
• + compiler/GHC/Data/Graph/Directed/Reachability.hs
• compiler/GHC/Data/Graph/Inductive/Graph.hs
• compiler/GHC/Data/IOEnv.hs
• + compiler/GHC/Data/List.hs
• compiler/GHC/Data/List/Infinite.hs
• + compiler/GHC/Data/List/NonEmpty.hs
• compiler/GHC/Data/Maybe.hs
• compiler/GHC/Data/Pair.hs
• compiler/GHC/Data/SmallArray.hs
• compiler/GHC/Data/Stream.hs
• compiler/GHC/Data/Strict.hs
• compiler/GHC/Data/StringBuffer.hs
• compiler/GHC/Data/TrieMap.hs
• compiler/GHC/Data/Unboxed.hs
• compiler/GHC/Data/Word64Map/Internal.hs
• compiler/GHC/Data/Word64Map/Lazy.hs
• compiler/GHC/Data/Word64Map/Strict.hs
• compiler/GHC/Data/Word64Map/Strict/Internal.hs
• compiler/GHC/Data/Word64Set.hs
• compiler/GHC/Data/Word64Set/Internal.hs
• compiler/GHC/Driver/Backend.hs
• compiler/GHC/Driver/Backend/Internal.hs
• compiler/GHC/Driver/Backpack.hs
• + compiler/GHC/Driver/ByteCode.hs
• compiler/GHC/Driver/CmdLine.hs
• compiler/GHC/Driver/CodeOutput.hs
• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/Cmm.hs
• compiler/GHC/Driver/Config/CmmToAsm.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Config/Core/Opt/Simplify.hs
• compiler/GHC/Driver/Config/Core/Rules.hs
• compiler/GHC/Driver/Config/CoreToStg/Prep.hs
• compiler/GHC/Driver/Config/Finder.hs
• compiler/GHC/Driver/Config/Linker.hs
• compiler/GHC/Driver/Config/Parser.hs
• compiler/GHC/Driver/Config/Stg/Debug.hs
• compiler/GHC/Driver/Config/Stg/Pipeline.hs
• compiler/GHC/Driver/Config/StgToCmm.hs
• + compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env.hs
• compiler/GHC/Driver/Env/Types.hs
• compiler/GHC/Driver/Errors.hs
• compiler/GHC/Driver/Errors/Ppr.hs
• compiler/GHC/Driver/Errors/Types.hs
• compiler/GHC/Driver/Flags.hs
• compiler/GHC/Driver/GenerateCgIPEStub.hs
• compiler/GHC/Driver/Hooks.hs
• + compiler/GHC/Driver/IncludeSpecs.hs
• compiler/GHC/Driver/Main.hs
• + compiler/GHC/Driver/Main.hs-boot
• compiler/GHC/Driver/Make.hs
• + compiler/GHC/Driver/MakeAction.hs
• compiler/GHC/Driver/MakeFile.hs
• + compiler/GHC/Driver/Messager.hs
• compiler/GHC/Driver/Monad.hs
• compiler/GHC/Driver/Phases.hs
• compiler/GHC/Driver/Pipeline.hs
• compiler/GHC/Driver/Pipeline.hs-boot
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Plugins.hs
• compiler/GHC/Driver/Ppr.hs
• compiler/GHC/Driver/Session.hs
• + compiler/GHC/Driver/Session/Inspect.hs
• + compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs.hs
• + compiler/GHC/Hs/Basic.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• compiler/GHC/Hs/Doc.hs
• + compiler/GHC/Hs/Doc.hs-boot
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Expr.hs-boot
• compiler/GHC/Hs/Extension.hs
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Instances.hs
• compiler/GHC/Hs/Lit.hs
• compiler/GHC/Hs/Pat.hs
• + compiler/GHC/Hs/Specificity.hs
• compiler/GHC/Hs/Stats.hs
• compiler/GHC/Hs/Syn/Type.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Arrows.hs
• compiler/GHC/HsToCore/Binds.hs
• compiler/GHC/HsToCore/Breakpoints.hs
• compiler/GHC/HsToCore/Coverage.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Errors/Ppr.hs
• compiler/GHC/HsToCore/Errors/Types.hs
• compiler/GHC/HsToCore/Expr.hs
• compiler/GHC/HsToCore/Foreign/C.hs
• compiler/GHC/HsToCore/Foreign/Call.hs
• compiler/GHC/HsToCore/Foreign/JavaScript.hs
• compiler/GHC/HsToCore/Foreign/Wasm.hs
• compiler/GHC/HsToCore/GuardedRHSs.hs
• compiler/GHC/HsToCore/ListComp.hs
• compiler/GHC/HsToCore/Match.hs
• compiler/GHC/HsToCore/Match/Constructor.hs
• compiler/GHC/HsToCore/Match/Literal.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Ppr.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/Pmc/Types.hs
• compiler/GHC/HsToCore/Pmc/Utils.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/HsToCore/Utils.hs
• compiler/GHC/Iface/Binary.hs
• compiler/GHC/Iface/Decl.hs
• compiler/GHC/Iface/Env.hs
• compiler/GHC/Iface/Errors.hs
• compiler/GHC/Iface/Errors/Ppr.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Binary.hs
• compiler/GHC/Iface/Ext/Fields.hs
• compiler/GHC/Iface/Ext/Types.hs
• + compiler/GHC/Iface/Flags.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Make.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/Recomp/Binary.hs
• compiler/GHC/Iface/Recomp/Flags.hs
• + compiler/GHC/Iface/Recomp/Types.hs
• compiler/GHC/Iface/Rename.hs
• compiler/GHC/Iface/Syntax.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Tidy/StaticPtrTable.hs
• compiler/GHC/Iface/Type.hs
• + compiler/GHC/Iface/Warnings.hs
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/IfaceToCore.hs-boot
• compiler/GHC/JS/Ident.hs
• compiler/GHC/JS/JStg/Monad.hs
• compiler/GHC/JS/JStg/Syntax.hs
• compiler/GHC/JS/Make.hs
• compiler/GHC/JS/Opt/Expr.hs
• compiler/GHC/JS/Opt/Simple.hs
• compiler/GHC/JS/Ppr.hs
• compiler/GHC/JS/Syntax.hs
• compiler/GHC/Linker/Config.hs
• compiler/GHC/Linker/Deps.hs
• compiler/GHC/Linker/Dynamic.hs
• compiler/GHC/Linker/ExtraObj.hs
• compiler/GHC/Linker/Loader.hs
• compiler/GHC/Linker/MacOS.hs
• compiler/GHC/Linker/Static.hs
• compiler/GHC/Linker/Types.hs
• compiler/GHC/Linker/Unit.hs
• compiler/GHC/Llvm/Ppr.hs
• compiler/GHC/Llvm/Syntax.hs
• compiler/GHC/Llvm/Types.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/CharClass.hs
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/HaddockLex.x
• compiler/GHC/Parser/Header.hs
• compiler/GHC/Parser/Lexer.x
• + compiler/GHC/Parser/Lexer/Interface.hs
• + compiler/GHC/Parser/Lexer/String.x
• compiler/GHC/Parser/PostProcess.hs
• compiler/GHC/Parser/PostProcess/Haddock.hs
• + compiler/GHC/Parser/String.hs
• compiler/GHC/Parser/Types.hs
• compiler/GHC/Platform.hs
• compiler/GHC/Platform/LoongArch64.hs → compiler/GHC/Platform/LA64.hs
• compiler/GHC/Platform/Reg.hs
• compiler/GHC/Platform/Reg/Class.hs
• + compiler/GHC/Platform/Reg/Class/NoVectors.hs
• + compiler/GHC/Platform/Reg/Class/Separate.hs
• + compiler/GHC/Platform/Reg/Class/Unified.hs
• compiler/GHC/Platform/Regs.hs
• compiler/GHC/Platform/Ways.hs
• compiler/GHC/Plugins.hs
• compiler/GHC/Prelude/Basic.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.hs
• compiler/GHC/Rename/Fixity.hs
• compiler/GHC/Rename/HsType.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Pat.hs
• compiler/GHC/Rename/Splice.hs
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/Rename/Utils.hs
• compiler/GHC/Runtime/Context.hs
• compiler/GHC/Runtime/Debugger.hs
• + compiler/GHC/Runtime/Debugger/Breakpoints.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• + compiler/GHC/Runtime/Eval/Utils.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Interpreter/JS.hs
• compiler/GHC/Runtime/Interpreter/Process.hs
• compiler/GHC/Runtime/Interpreter/Types.hs
• + compiler/GHC/Runtime/Interpreter/Types/SymbolCache.hs
• + compiler/GHC/Runtime/Interpreter/Wasm.hs
• compiler/GHC/Runtime/Loader.hs
• compiler/GHC/Settings.hs
• compiler/GHC/Settings/IO.hs
• compiler/GHC/Stg/BcPrep.hs
• compiler/GHC/Stg/CSE.hs
• compiler/GHC/Stg/Debug.hs
• + compiler/GHC/Stg/Debug/Types.hs
• compiler/GHC/Stg/InferTags.hs → compiler/GHC/Stg/EnforceEpt.hs
• compiler/GHC/Stg/InferTags/Rewrite.hs → compiler/GHC/Stg/EnforceEpt/Rewrite.hs
• compiler/GHC/Stg/InferTags/TagSig.hs → compiler/GHC/Stg/EnforceEpt/TagSig.hs
• compiler/GHC/Stg/InferTags/Types.hs → compiler/GHC/Stg/EnforceEpt/Types.hs
• compiler/GHC/Stg/FVs.hs
• compiler/GHC/Stg/Lift/Analysis.hs
• compiler/GHC/Stg/Lint.hs
• + compiler/GHC/Stg/Make.hs
• compiler/GHC/Stg/Pipeline.hs
• compiler/GHC/Stg/Stats.hs
• compiler/GHC/Stg/Syntax.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/Stg/Utils.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm.hs
• compiler/GHC/StgToCmm/ArgRep.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/CgUtils.hs
• compiler/GHC/StgToCmm/Closure.hs
• compiler/GHC/StgToCmm/Config.hs
• compiler/GHC/StgToCmm/DataCon.hs
• compiler/GHC/StgToCmm/Expr.hs
• compiler/GHC/StgToCmm/ExtCode.hs
• compiler/GHC/StgToCmm/Foreign.hs
• compiler/GHC/StgToCmm/Hpc.hs
• compiler/GHC/StgToCmm/InfoTableProv.hs
• compiler/GHC/StgToCmm/Layout.hs
• compiler/GHC/StgToCmm/Lit.hs
• compiler/GHC/StgToCmm/Monad.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/Prof.hs
• compiler/GHC/StgToCmm/TagCheck.hs
• compiler/GHC/StgToCmm/Types.hs
• compiler/GHC/StgToCmm/Utils.hs
• compiler/GHC/StgToJS.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/Arg.hs
• compiler/GHC/StgToJS/Closure.hs
• compiler/GHC/StgToJS/CodeGen.hs
• compiler/GHC/StgToJS/Expr.hs
• compiler/GHC/StgToJS/ExprCtx.hs
• compiler/GHC/StgToJS/FFI.hs
• compiler/GHC/StgToJS/Heap.hs
• compiler/GHC/StgToJS/Ids.hs
• compiler/GHC/StgToJS/Linker/Linker.hs
• compiler/GHC/StgToJS/Linker/Utils.hs
• compiler/GHC/StgToJS/Literal.hs
• compiler/GHC/StgToJS/Monad.hs
• compiler/GHC/StgToJS/Object.hs
• compiler/GHC/StgToJS/Prim.hs
• compiler/GHC/StgToJS/Profiling.hs
• compiler/GHC/StgToJS/Regs.hs
• compiler/GHC/StgToJS/Rts/Rts.hs
• compiler/GHC/StgToJS/Rts/Types.hs
• + compiler/GHC/StgToJS/Sinker/Collect.hs
• compiler/GHC/StgToJS/Sinker.hs → compiler/GHC/StgToJS/Sinker/Sinker.hs
• + compiler/GHC/StgToJS/Sinker/StringsUnfloat.hs
• compiler/GHC/StgToJS/Stack.hs
• compiler/GHC/StgToJS/StaticPtr.hs
• compiler/GHC/StgToJS/Symbols.hs
• compiler/GHC/StgToJS/Types.hs
• compiler/GHC/StgToJS/Utils.hs
• compiler/GHC/SysTools/Ar.hs
• compiler/GHC/SysTools/BaseDir.hs
• compiler/GHC/SysTools/Cpp.hs
• compiler/GHC/SysTools/Process.hs
• compiler/GHC/SysTools/Tasks.hs
• compiler/GHC/Tc/Deriv.hs
• compiler/GHC/Tc/Deriv/Functor.hs
• compiler/GHC/Tc/Deriv/Generate.hs
• compiler/GHC/Tc/Deriv/Generics.hs
• compiler/GHC/Tc/Deriv/Infer.hs
• compiler/GHC/Tc/Deriv/Utils.hs
• compiler/GHC/Tc/Errors.hs
• compiler/GHC/Tc/Errors/Hole.hs
• compiler/GHC/Tc/Errors/Hole.hs-boot
• compiler/GHC/Tc/Errors/Hole/FitTypes.hs
• compiler/GHC/Tc/Errors/Hole/Plugin.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Errors/Types/PromotionErr.hs
• compiler/GHC/Tc/Gen/Annotation.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Arrow.hs
• compiler/GHC/Tc/Gen/Bind.hs
• compiler/GHC/Tc/Gen/Default.hs
• compiler/GHC/Tc/Gen/Do.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Expr.hs
• compiler/GHC/Tc/Gen/Expr.hs-boot
• compiler/GHC/Tc/Gen/Foreign.hs
• compiler/GHC/Tc/Gen/Head.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Match.hs
• compiler/GHC/Tc/Gen/Pat.hs
• − compiler/GHC/Tc/Gen/Rule.hs
• compiler/GHC/Tc/Gen/Sig.hs
• compiler/GHC/Tc/Gen/Splice.hs
• compiler/GHC/Tc/Gen/Splice.hs-boot
• compiler/GHC/Tc/Instance/Class.hs
• compiler/GHC/Tc/Instance/Family.hs
• compiler/GHC/Tc/Instance/FunDeps.hs
• compiler/GHC/Tc/Instance/Typeable.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Plugin.hs
• compiler/GHC/Tc/Solver.hs
• + compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Dict.hs
• compiler/GHC/Tc/Solver/Equality.hs
• + compiler/GHC/Tc/Solver/FunDeps.hs
• compiler/GHC/Tc/Solver/InertSet.hs
• compiler/GHC/Tc/Solver/Irred.hs
• compiler/GHC/Tc/Solver/Monad.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/Solver/Solve.hs
• + compiler/GHC/Tc/Solver/Solve.hs-boot
• compiler/GHC/Tc/Solver/Types.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/Class.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/BasicTypes.hs
• compiler/GHC/Tc/Types/Constraint.hs
• + compiler/GHC/Tc/Types/CtLoc.hs
• − compiler/GHC/Tc/Types/CtLocEnv.hs
• compiler/GHC/Tc/Types/ErrCtxt.hs
• − compiler/GHC/Tc/Types/EvTerm.hs
• compiler/GHC/Tc/Types/Evidence.hs
• compiler/GHC/Tc/Types/LclEnv.hs
• compiler/GHC/Tc/Types/Origin.hs
• compiler/GHC/Tc/Types/TH.hs
• compiler/GHC/Tc/Types/TcRef.hs
• compiler/GHC/Tc/Utils/Backpack.hs
• compiler/GHC/Tc/Utils/Concrete.hs
• compiler/GHC/Tc/Utils/Env.hs
• compiler/GHC/Tc/Utils/Instantiate.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• compiler/GHC/Tc/Utils/TcMType.hs-boot
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Utils/Unify.hs-boot
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/Env.hs
• compiler/GHC/Tc/Zonk/Monad.hs
• compiler/GHC/Tc/Zonk/TcType.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Annotations.hs
• compiler/GHC/Types/Avail.hs
• compiler/GHC/Types/Basic.hs
• − compiler/GHC/Types/Breakpoint.hs
• compiler/GHC/Types/CompleteMatch.hs
• compiler/GHC/Types/CostCentre.hs
• compiler/GHC/Types/CostCentre/State.hs
• + compiler/GHC/Types/DefaultEnv.hs
• compiler/GHC/Types/Demand.hs
• compiler/GHC/Types/Error.hs
• compiler/GHC/Types/Error/Codes.hs
• compiler/GHC/Types/Fixity.hs
• compiler/GHC/Types/Fixity/Env.hs
• compiler/GHC/Types/ForeignCall.hs
• compiler/GHC/Types/GREInfo.hs
• compiler/GHC/Types/Hint.hs
• compiler/GHC/Types/Hint/Ppr.hs
• compiler/GHC/Types/HpcInfo.hs
• compiler/GHC/Types/IPE.hs
• compiler/GHC/Types/Id.hs
• compiler/GHC/Types/Id/Info.hs
• compiler/GHC/Types/Id/Make.hs
• compiler/GHC/Types/Literal.hs
• compiler/GHC/Types/Meta.hs
• compiler/GHC/Types/Name.hs
• compiler/GHC/Types/Name/Cache.hs
• compiler/GHC/Types/Name/Env.hs
• compiler/GHC/Types/Name/Occurrence.hs
• compiler/GHC/Types/Name/Ppr.hs
• compiler/GHC/Types/Name/Reader.hs
• compiler/GHC/Types/PkgQual.hs
• compiler/GHC/Types/ProfAuto.hs
• compiler/GHC/Types/RepType.hs
• compiler/GHC/Types/SafeHaskell.hs
• compiler/GHC/Types/SourceError.hs
• compiler/GHC/Types/SourceFile.hs
• + compiler/GHC/Types/SptEntry.hs
• compiler/GHC/Types/SrcLoc.hs
• + compiler/GHC/Types/ThLevelIndex.hs
• compiler/GHC/Types/Tickish.hs
• compiler/GHC/Types/TyThing.hs
• compiler/GHC/Types/TyThing/Ppr.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/Unique/DFM.hs
• + compiler/GHC/Types/Unique/DSM.hs
• compiler/GHC/Types/Unique/DSet.hs
• compiler/GHC/Types/Unique/FM.hs
• compiler/GHC/Types/Unique/Set.hs
• compiler/GHC/Types/Unique/Supply.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Types/Var.hs-boot
• compiler/GHC/Types/Var/Env.hs
• compiler/GHC/Unit/Env.hs
• compiler/GHC/Unit/External.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Finder/Types.hs
• + compiler/GHC/Unit/Home/Graph.hs
• compiler/GHC/Unit/Home/ModInfo.hs
• + compiler/GHC/Unit/Home/PackageTable.hs
• compiler/GHC/Unit/Info.hs
• compiler/GHC/Unit/Module/Deps.hs
• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/Imported.hs
• compiler/GHC/Unit/Module/Location.hs
• compiler/GHC/Unit/Module/ModDetails.hs
• compiler/GHC/Unit/Module/ModGuts.hs
• compiler/GHC/Unit/Module/ModIface.hs
• + compiler/GHC/Unit/Module/ModNodeKey.hs
• compiler/GHC/Unit/Module/ModSummary.hs
• + compiler/GHC/Unit/Module/Stage.hs
• compiler/GHC/Unit/Module/Status.hs
• compiler/GHC/Unit/Module/Warnings.hs
• compiler/GHC/Unit/Module/WholeCoreBindings.hs
• compiler/GHC/Unit/State.hs
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Utils/Binary.hs
• + compiler/GHC/Utils/EndoOS.hs
• compiler/GHC/Utils/Error.hs
• compiler/GHC/Utils/GlobalVars.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Misc.hs
• compiler/GHC/Utils/Monad.hs
• compiler/GHC/Utils/Monad/State/Strict.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Panic.hs
• compiler/GHC/Utils/Panic/Plain.hs
• compiler/GHC/Utils/Ppr.hs
• compiler/GHC/Utils/TmpFs.hs
• compiler/GHC/Utils/Touch.hs
• compiler/GHC/Utils/Unique.hs
• compiler/GHC/Wasm/ControlFlow/FromCmm.hs
• compiler/Language/Haskell/Syntax.hs
• compiler/Language/Haskell/Syntax/Basic.hs
• compiler/Language/Haskell/Syntax/Binds.hs
• + compiler/Language/Haskell/Syntax/BooleanFormula.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/Expr.hs-boot
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• − compiler/Language/Haskell/Syntax/ImpExp.hs-boot
• + compiler/Language/Haskell/Syntax/ImpExp/IsBoot.hs
• compiler/Language/Haskell/Syntax/Lit.hs
• compiler/Language/Haskell/Syntax/Module/Name.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• + compiler/Language/Haskell/Syntax/Specificity.hs
• compiler/Language/Haskell/Syntax/Type.hs
• compiler/Language/Haskell/Syntax/Type.hs-boot
• compiler/Setup.hs
• compiler/cbits/genSym.c
• compiler/cbits/keepCAFsForGHCi.c
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• − distrib/cross-port
• − docs/users_guide/9.12.1-notes.rst
• + docs/users_guide/9.16.1-notes.rst
• docs/users_guide/bugs.rst
• docs/users_guide/conf.py
• docs/users_guide/debug-info.rst
• docs/users_guide/debugging.rst
• docs/users_guide/diagnostics-as-json-schema-1_0.json
• + docs/users_guide/diagnostics-as-json-schema-1_1.json
• + docs/users_guide/diagnostics-as-json-schema-1_2.json
• docs/users_guide/eventlog-formats.rst
• docs/users_guide/expected-undocumented-flags.txt
• docs/users_guide/extending_ghc.rst
• docs/users_guide/exts/assert.rst
• docs/users_guide/exts/control.rst
• docs/users_guide/exts/data_kinds.rst
• docs/users_guide/exts/default_signatures.rst
• + docs/users_guide/exts/doandifthenelse.rst
• docs/users_guide/exts/equality_constraints.rst
• docs/users_guide/exts/explicit_namespaces.rst
• docs/users_guide/exts/extended_literals.rst
• docs/users_guide/exts/ffi.rst
• docs/users_guide/exts/gadt.rst
• docs/users_guide/exts/gadt_syntax.rst
• docs/users_guide/exts/hasfield.rst
• docs/users_guide/exts/instances.rst
• docs/users_guide/exts/linear_types.rst
• docs/users_guide/exts/literals.rst
• docs/users_guide/exts/magic_hash.rst
• docs/users_guide/exts/monad_comprehensions.rst
• + docs/users_guide/exts/multiline_strings.rst
• + docs/users_guide/exts/named_defaults.rst
• docs/users_guide/exts/or_patterns.rst
• docs/users_guide/exts/overloaded_record_update.rst
• docs/users_guide/exts/overloaded_strings.rst
• docs/users_guide/exts/parallel_list_comprehensions.rst
• docs/users_guide/exts/pattern_synonyms.rst
• docs/users_guide/exts/poly_kinds.rst
• docs/users_guide/exts/pragmas.rst
• docs/users_guide/exts/primitives.rst
• docs/users_guide/exts/rebindable_syntax.rst
• + docs/users_guide/exts/relaxed_poly_rec.rst
• docs/users_guide/exts/representation_polymorphism.rst
• docs/users_guide/exts/required_type_arguments.rst
• docs/users_guide/exts/rewrite_rules.rst
• docs/users_guide/exts/scoped_type_variables.rst
• docs/users_guide/exts/stolen_syntax.rst
• docs/users_guide/exts/strict.rst
• docs/users_guide/exts/syntax.rst
• docs/users_guide/exts/template_haskell.rst
• docs/users_guide/exts/type_abstractions.rst
• + docs/users_guide/exts/type_defaulting.rst
• docs/users_guide/exts/type_signatures.rst
• docs/users_guide/exts/types.rst
• docs/users_guide/flags.py
• docs/users_guide/ghci.rst
• docs/users_guide/javascript.rst
• docs/users_guide/packages.rst
• docs/users_guide/phases.rst
• docs/users_guide/profiling.rst
• docs/users_guide/release-notes.rst
• docs/users_guide/runtime_control.rst
• docs/users_guide/separate_compilation.rst
• docs/users_guide/using-concurrent.rst
• docs/users_guide/using-optimisation.rst
• docs/users_guide/using-warnings.rst
• docs/users_guide/using.rst
• docs/users_guide/wasm.rst
• docs/users_guide/win32-dlls.rst
• driver/utils/isMinTTY.c
• + ghc/GHC/Driver/Session/Lint.hs
• + ghc/GHC/Driver/Session/Mode.hs
• ghc/GHCi/Leak.hs
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Exception.hs
• ghc/GHCi/UI/Info.hs
• ghc/GHCi/UI/Monad.hs
• + ghc/GHCi/UI/Print.hs
• ghc/Main.hs
• ghc/ghc-bin.cabal.in
• − ghc/ghc.wrapper
• hadrian/README.md
• hadrian/bindist/Makefile
• hadrian/bindist/config.mk.in
• hadrian/bootstrap/bootstrap.py
• hadrian/bootstrap/generate_bootstrap_plans
• hadrian/bootstrap/hadrian-bootstrap-gen.cabal
• hadrian/bootstrap/plan-9_4_2.json → hadrian/bootstrap/plan-9_10_1.json
• hadrian/bootstrap/plan-9_4_4.json → hadrian/bootstrap/plan-9_10_2.json
• hadrian/bootstrap/plan-9_8_1.json → hadrian/bootstrap/plan-9_12_1.json
• hadrian/bootstrap/plan-9_6_2.json → hadrian/bootstrap/plan-9_12_2.json
• − hadrian/bootstrap/plan-9_4_1.json
• − hadrian/bootstrap/plan-9_4_3.json
• − hadrian/bootstrap/plan-9_4_5.json
• − hadrian/bootstrap/plan-9_4_6.json
• − hadrian/bootstrap/plan-9_4_7.json
• − hadrian/bootstrap/plan-9_4_8.json
• − hadrian/bootstrap/plan-9_6_1.json
• − hadrian/bootstrap/plan-9_6_3.json
• − hadrian/bootstrap/plan-9_6_4.json
• hadrian/bootstrap/plan-bootstrap-9_4_6.json → hadrian/bootstrap/plan-bootstrap-9_10_1.json
• hadrian/bootstrap/plan-bootstrap-9_4_1.json → hadrian/bootstrap/plan-bootstrap-9_10_2.json
• hadrian/bootstrap/plan-bootstrap-9_8_1.json → hadrian/bootstrap/plan-bootstrap-9_12_1.json
• hadrian/bootstrap/plan-bootstrap-9_6_2.json → hadrian/bootstrap/plan-bootstrap-9_12_2.json
• − hadrian/bootstrap/plan-bootstrap-9_4_2.json
• − hadrian/bootstrap/plan-bootstrap-9_4_3.json
• − hadrian/bootstrap/plan-bootstrap-9_4_4.json
• − hadrian/bootstrap/plan-bootstrap-9_4_5.json
• − hadrian/bootstrap/plan-bootstrap-9_4_7.json
• − hadrian/bootstrap/plan-bootstrap-9_4_8.json
• − hadrian/bootstrap/plan-bootstrap-9_6_1.json
• − hadrian/bootstrap/plan-bootstrap-9_6_3.json
• − hadrian/bootstrap/plan-bootstrap-9_6_4.json
• hadrian/bootstrap/src/Main.hs
• hadrian/build-cabal
• hadrian/cabal.project
• hadrian/cfg/default.host.target.in
• hadrian/cfg/default.target.in
• hadrian/cfg/system.config.in
• hadrian/doc/flavours.md
• hadrian/doc/user-settings.md
• hadrian/ghci-multi-cabal.in
• hadrian/hadrian.cabal
• hadrian/src/Base.hs
• hadrian/src/Builder.hs
• hadrian/src/CommandLine.hs
• hadrian/src/Context.hs
• hadrian/src/Context/Path.hs
• hadrian/src/Context/Type.hs
• hadrian/src/Flavour.hs
• hadrian/src/Flavour/Type.hs
• hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
• hadrian/src/Hadrian/Haskell/Cabal/Type.hs
• hadrian/src/Hadrian/Haskell/Hash.hs
• hadrian/src/Hadrian/Utilities.hs
• hadrian/src/Main.hs
• hadrian/src/Oracles/Flag.hs
• hadrian/src/Oracles/ModuleFiles.hs
• hadrian/src/Oracles/Setting.hs
• hadrian/src/Oracles/TestSettings.hs
• hadrian/src/Packages.hs
• + hadrian/src/Progress.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
• hadrian/src/Rules/Dependencies.hs
• hadrian/src/Rules/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Gmp.hs
• hadrian/src/Rules/Libffi.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Lint.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Register.hs
• hadrian/src/Rules/Rts.hs
• hadrian/src/Rules/SourceDist.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/Common.hs
• hadrian/src/Settings/Builders/Configure.hs
• hadrian/src/Settings/Builders/DeriveConstants.hs
• hadrian/src/Settings/Builders/GenApply.hs
• hadrian/src/Settings/Builders/GenPrimopCode.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Builders/Hsc2Hs.hs
• hadrian/src/Settings/Builders/RunTest.hs
• hadrian/src/Settings/Default.hs
• hadrian/src/Settings/Flavours/GhcInGhci.hs
• hadrian/src/Settings/Flavours/Performance.hs
• hadrian/src/Settings/Flavours/Release.hs
• hadrian/src/Settings/Packages.hs
• hadrian/src/Settings/Parser.hs
• hadrian/src/Settings/Program.hs
• hadrian/src/Settings/Warnings.hs
• hadrian/src/Way.hs
• hadrian/stack.yaml
• hadrian/stack.yaml.lock
• libffi-tarballs
• − libffi/Makefile
• − libffi/ln
• libraries/Cabal
• libraries/Win32
• libraries/array
• libraries/base/base.cabal → libraries/base/base.cabal.in
• libraries/base/changelog.md
• libraries/base/src/Control/Applicative.hs
• libraries/base/src/Control/Category.hs
• libraries/base/src/Control/Concurrent.hs
• libraries/base/src/Control/Exception.hs
• libraries/base/src/Control/Exception/Backtrace.hs
• libraries/base/src/Control/Monad.hs
• libraries/base/src/Control/Monad/Fix.hs
• libraries/base/src/Control/Monad/Zip.hs
• libraries/base/src/Data/Array/Byte.hs
• libraries/base/src/Data/Bifunctor.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Enum.hs → libraries/base/src/Data/Bounded.hs
• libraries/base/src/Data/Char.hs
• libraries/base/src/Data/Enum.hs
• libraries/base/src/Data/Fixed.hs
• libraries/base/src/Data/Functor/Classes.hs
• libraries/base/src/Data/List.hs
• libraries/base/src/Data/List/NonEmpty.hs
• libraries/base/src/Data/Semigroup.hs
• libraries/base/src/GHC/Base.hs
• libraries/base/src/GHC/Desugar.hs
• libraries/base/src/GHC/Exception.hs
• − libraries/base/src/GHC/ExecutionStack/Internal.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/Generics.hs
• − libraries/base/src/GHC/IOPort.hs
• libraries/base/src/GHC/JS/Prim/Internal/Build.hs
• + libraries/base/src/GHC/Num/BigNat.hs
• + libraries/base/src/GHC/Num/Integer.hs
• + libraries/base/src/GHC/Num/Natural.hs
• − libraries/base/src/GHC/Pack.hs
• libraries/base/src/GHC/RTS/Flags.hs
• libraries/base/src/GHC/Records.hs
• libraries/base/src/GHC/Stack/CloneStack.hs
• libraries/base/src/GHC/Stats.hs
• − libraries/base/src/GHC/TypeLits/Internal.hs
• libraries/base/src/GHC/Weak/Finalize.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/System/CPUTime/Windows.hsc
• libraries/base/src/System/Console/GetOpt.hs
• libraries/base/src/System/Timeout.hs
• libraries/base/tests/IO/Makefile
• libraries/base/tests/IO/T21336/T21336a.stderr
• libraries/base/tests/IO/T21336/T21336b.stderr
• libraries/base/tests/IO/T4808.stderr
• libraries/base/tests/IO/all.T
• libraries/base/tests/IO/mkdirExists.stderr
• libraries/base/tests/IO/openFile002.stderr
• libraries/base/tests/IO/openFile002.stderr-mingw32
• libraries/base/tests/IO/openFile002.stderr-mingw32-2
• libraries/base/tests/IO/withBinaryFile001.stderr
• libraries/base/tests/IO/withBinaryFile002.stderr
• libraries/base/tests/IO/withFile001.stderr
• libraries/base/tests/IO/withFile002.stderr
• libraries/base/tests/IO/withFileBlocking001.stderr
• libraries/base/tests/IO/withFileBlocking002.stderr
• libraries/base/tests/T15349.stderr
• libraries/base/tests/T16111.stderr
• libraries/base/tests/T19288.stderr
• + libraries/base/tests/T24807.hs
• + libraries/base/tests/T24807.stderr
• + libraries/base/tests/T25066.hs
• + libraries/base/tests/T25066.stderr
• libraries/base/tests/T9586.hs
• libraries/base/tests/all.T
• libraries/base/tests/assert.stderr
• libraries/base/tests/dynamic002.hs
• libraries/base/tests/enum01.stdout
• libraries/base/tests/enum01.stdout-alpha-dec-osf3
• libraries/base/tests/enum01.stdout-ws-64
• libraries/base/tests/enum02.stdout
• libraries/base/tests/enum02.stdout-alpha-dec-osf3
• libraries/base/tests/enum02.stdout-mips-sgi-irix
• libraries/base/tests/enum02.stdout-ws-64
• libraries/base/tests/enum02.stdout-x86_64-unknown-openbsd
• libraries/base/tests/enum03.stdout
• libraries/base/tests/enum03.stdout-alpha-dec-osf3
• libraries/base/tests/enum03.stdout-mips-sgi-irix
• libraries/base/tests/enum03.stdout-ws-64
• libraries/base/tests/enum03.stdout-x86_64-unknown-openbsd
• libraries/base/tests/foldableArray.hs
• libraries/base/tests/list001.hs
• libraries/base/tests/perf/encodingAllocations.hs
• libraries/base/tests/readFloat.stderr
• − libraries/base/tests/topHandler04.hs
• − libraries/base/tests/topHandler04.stderr
• libraries/base/tests/unicode002.stdout
• libraries/base/tests/unicode003.hs
• libraries/base/tests/unicode003.stdout
• libraries/binary
• libraries/bytestring
• libraries/containers
• libraries/deepseq
• libraries/directory
• libraries/exceptions
• + libraries/file-io
• libraries/filepath
• − libraries/ghc-bignum/.gitignore
• + libraries/ghc-bignum/Dummy.hs
• − libraries/ghc-bignum/aclocal.m4
• libraries/ghc-bignum/changelog.md
• − libraries/ghc-bignum/config.mk.in
• − libraries/ghc-bignum/configure.ac
• − libraries/ghc-bignum/ghc-bignum.buildinfo.in
• libraries/ghc-bignum/ghc-bignum.cabal
• − libraries/ghc-bignum/install-sh
• libraries/base/src/GHC/TypeNats/Internal.hs → libraries/ghc-boot-th/GHC/Boot/TH/Lib.hs
• libraries/ghc-boot-th/GHC/Internal/TH/Lib/Map.hs → libraries/ghc-boot-th/GHC/Boot/TH/Lib/Map.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Lift.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Monad.hs
• libraries/ghc-boot-th/GHC/Internal/TH/Ppr.hs → libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
• libraries/ghc-boot-th/GHC/Internal/TH/PprLib.hs → libraries/ghc-boot-th/GHC/Boot/TH/PprLib.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Syntax.hs
• libraries/ghc-boot-th/ghc-boot-th.cabal.in
• libraries/ghc-boot/GHC/BaseDir.hs
• libraries/ghc-boot/GHC/Data/ShortText.hs
• libraries/ghc-boot/GHC/Data/SizedSeq.hs
• libraries/ghc-boot/GHC/Serialized.hs
• libraries/ghc-boot/GHC/Settings/Utils.hs
• libraries/ghc-boot/GHC/Utils/Encoding.hs
• libraries/ghc-boot/GHC/Utils/Encoding/UTF8.hs
• libraries/ghc-boot/ghc-boot.cabal.in
• libraries/ghc-compact/GHC/Compact.hs
• libraries/ghc-compact/GHC/Compact/Serialized.hs
• libraries/ghc-compact/ghc-compact.cabal
• + libraries/ghc-compact/tests/T18757.stdout-wasm32-unknown-wasi
• libraries/ghc-compact/tests/all.T
• libraries/ghc-compact/tests/compact_function.stderr
• libraries/ghc-compact/tests/compact_mutable.stderr
• libraries/ghc-compact/tests/compact_pinned.stderr
• libraries/ghc-experimental/CHANGELOG.md
• libraries/ghc-experimental/ghc-experimental.cabal → libraries/ghc-experimental/ghc-experimental.cabal.in
• libraries/ghc-experimental/src/Data/Sum/Experimental.hs
• libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
• + libraries/ghc-experimental/src/GHC/Exception/Backtrace/Experimental.hs
• + libraries/ghc-experimental/src/GHC/PrimOps.hs
• + libraries/ghc-experimental/src/GHC/RTS/Flags/Experimental.hs
• + libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs
• + libraries/ghc-experimental/src/GHC/Stats/Experimental.hs
• + libraries/ghc-experimental/src/GHC/TypeLits/Experimental.hs
• + libraries/ghc-experimental/src/GHC/TypeNats/Experimental.hs
• libraries/ghc-experimental/src/GHC/Wasm/Prim.hs
• libraries/ghc-experimental/src/Prelude/Experimental.hs
• + libraries/ghc-experimental/src/System/Mem/Experimental.hs
• libraries/ghc-heap/GHC/Exts/Heap.hs
• libraries/ghc-heap/GHC/Exts/Heap/ClosureTypes.hs
• libraries/ghc-heap/GHC/Exts/Heap/Closures.hs
• + libraries/ghc-heap/GHC/Exts/Heap/Constants.hs
• libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
• libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
• + libraries/ghc-heap/GHC/Exts/Heap/InfoTable.hs
• + libraries/ghc-heap/GHC/Exts/Heap/InfoTable/Types.hs
• + libraries/ghc-heap/GHC/Exts/Heap/InfoTableProf.hs
• libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/PeekProfInfo_ProfilingEnabled.hsc
• libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/Types.hs
• libraries/ghc-heap/GHC/Exts/Heap/Utils.hsc
• libraries/ghc-heap/GHC/Exts/Stack.hs
• + libraries/ghc-heap/GHC/Exts/Stack/Constants.hs
• libraries/ghc-heap/GHC/Exts/Stack/Decode.hs
• libraries/ghc-heap/ghc-heap.cabal.in
• libraries/ghc-heap/tests/parse_tso_flags.hs
• libraries/ghc-heap/tests/stack_big_ret.hs
• libraries/ghc-heap/tests/stack_misc_closures_c.c
• libraries/ghc-internal/.gitignore
• libraries/ghc-internal/CHANGELOG.md
• libraries/ghc-internal/aclocal.m4
• libraries/ghc-bignum/README.rst → libraries/ghc-internal/bignum-backend.rst
• libraries/ghc-heap/cbits/HeapPrim.cmm → libraries/ghc-internal/cbits/HeapPrim.cmm
• + libraries/ghc-internal/cbits/RtsIface.c
• libraries/ghc-heap/cbits/Stack.cmm → libraries/ghc-internal/cbits/Stack.cmm
• libraries/ghc-internal/cbits/StackCloningDecoding.cmm
• libraries/ghc-heap/cbits/Stack_c.c → libraries/ghc-internal/cbits/Stack_c.c
• libraries/ghc-prim/cbits/debug.c → libraries/ghc-internal/cbits/debug.c
• libraries/ghc-bignum/cbits/gmp_wrappers.c → libraries/ghc-internal/cbits/gmp_wrappers.c
• libraries/ghc-internal/codepages/MakeTable.hs
• libraries/ghc-internal/codepages/Makefile
• libraries/ghc-internal/configure.ac
• libraries/ghc-internal/ghc-internal.buildinfo.in
• libraries/ghc-internal/ghc-internal.cabal → libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-bignum/GMP.rst → libraries/ghc-internal/gmp-backend.rst
• libraries/ghc-bignum/gmp/ghc-gmp.h → libraries/ghc-internal/gmp/ghc-gmp.h
• libraries/ghc-bignum/gmp/gmp-tarballs → libraries/ghc-internal/gmp/gmp-tarballs
• libraries/ghc-bignum/include/HsIntegerGmp.h.in → libraries/ghc-internal/include/HsIntegerGmp.h.in
• + libraries/ghc-internal/include/RtsIfaceSymbols.h
• libraries/ghc-bignum/include/WordSize.h → libraries/ghc-internal/include/WordSize.h
• − libraries/ghc-internal/include/alignment.h
• libraries/ghc-internal/jsbits/base.js
• libraries/ghc-internal/jsbits/errno.js
• libraries/ghc-internal/prologue.txt
• + libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
• libraries/ghc-internal/src/GHC/Internal/ArrayArray.hs
• libraries/ghc-internal/src/GHC/Internal/Base.hs
• libraries/ghc-bignum/src/GHC/Num/Backend.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs
• libraries/ghc-bignum/src/GHC/Num/Backend/Check.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Check.hs
• libraries/ghc-bignum/src/GHC/Num/Backend/FFI.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/FFI.hs
• libraries/ghc-bignum/src/GHC/Num/Backend/GMP.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/GMP.hs
• libraries/ghc-bignum/src/GHC/Num/Backend/Native.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
• libraries/ghc-bignum/src/GHC/Num/Backend/Selected.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Selected.hs
• libraries/ghc-bignum/src/GHC/Num/BigNat.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs
• libraries/ghc-bignum/src/GHC/Num/BigNat.hs-boot → libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs-boot
• libraries/ghc-bignum/src/GHC/Num/Integer.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
• libraries/ghc-bignum/src/GHC/Num/Integer.hs-boot → libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs-boot
• libraries/ghc-bignum/src/GHC/Num/Natural.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
• libraries/ghc-bignum/src/GHC/Num/Natural.hs-boot → libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs-boot
• libraries/ghc-bignum/src/GHC/Num/Primitives.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/Primitives.hs
• libraries/ghc-bignum/src/GHC/Num/WordArray.hs → libraries/ghc-internal/src/GHC/Internal/Bignum/WordArray.hs
• libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs-boot
• libraries/ghc-prim/GHC/CString.hs → libraries/ghc-internal/src/GHC/Internal/CString.hs
• libraries/ghc-internal/src/GHC/Internal/Char.hs
• libraries/ghc-prim/GHC/Classes.hs → libraries/ghc-internal/src/GHC/Internal/Classes.hs
• libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
• libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
• libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Category.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fail.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fix.hs
• + libraries/ghc-internal/src/GHC/Internal/Control/Monad/Zip.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Coerce.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
• + libraries/ghc-internal/src/GHC/Internal/Data/List/NonEmpty.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
• + libraries/ghc-internal/src/GHC/Internal/Data/NonEmpty.hs
• libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Tuple.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Version.hs-boot
• libraries/ghc-prim/GHC/Debug.hs → libraries/ghc-internal/src/GHC/Internal/Debug.hs
• libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs
• libraries/ghc-internal/src/GHC/Internal/Encoding/UTF8.hs
• libraries/ghc-internal/src/GHC/Internal/Enum.hs
• libraries/ghc-internal/src/GHC/Internal/Enum.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Err.hs
• libraries/ghc-internal/src/GHC/Internal/Event.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Arr.hs
• libraries/ghc-internal/src/GHC/Internal/Event/IntTable.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Internal/Types.hs
• libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Manager.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/ConsoleEvent.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/Exception.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Exts.hs
• libraries/ghc-internal/src/GHC/Internal/Float.hs
• libraries/ghc-internal/src/GHC/Internal/Float/ConversionUtils.hs
• libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/String/Encoding.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/Types.hs
• libraries/ghc-internal/src/GHC/Internal/Generics.hs
• + libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
• libraries/ghc-heap/GHC/Exts/Heap/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/Constants.hsc
• libraries/ghc-heap/GHC/Exts/Heap/InfoTable.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc
• libraries/ghc-heap/GHC/Exts/Heap/InfoTable/Types.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable/Types.hsc
• libraries/ghc-heap/GHC/Exts/Heap/InfoTableProf.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc
• + libraries/ghc-internal/src/GHC/Internal/Heap/ProfInfo/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO.hs
• libraries/ghc-internal/src/GHC/Internal/IO.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/Buffer.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/Table.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Iconv.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/FD.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Internals.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Flock.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/LinuxOFD.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/SubSystem.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
• − libraries/ghc-internal/src/GHC/Internal/IOPort.hs
• libraries/ghc-internal/src/GHC/Internal/InfoProv/Types.hsc
• libraries/ghc-internal/src/GHC/Internal/Int.hs
• libraries/ghc-internal/src/GHC/Internal/Integer.hs
• libraries/ghc-internal/src/GHC/Internal/Integer/Logarithms.hs
• libraries/ghc-internal/src/GHC/Internal/IsList.hs
• libraries/ghc-internal/src/GHC/Internal/Ix.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Foreign/Callback.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Prim.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal/Build.hs
• libraries/ghc-internal/src/GHC/Internal/LanguageExtensions.hs
• libraries/ghc-internal/src/GHC/Internal/List.hs
• libraries/ghc-prim/GHC/Magic.hs → libraries/ghc-internal/src/GHC/Internal/Magic.hs
• libraries/ghc-prim/GHC/Magic/Dict.hs → libraries/ghc-internal/src/GHC/Internal/Magic/Dict.hs
• libraries/ghc-internal/src/GHC/Internal/Maybe.hs
• libraries/ghc-internal/src/GHC/Internal/Natural.hs
• libraries/ghc-internal/src/GHC/Internal/Num.hs
• libraries/ghc-internal/src/GHC/Internal/Num.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Numeric.hs
• libraries/ghc-internal/src/GHC/Internal/Numeric/Natural.hs
• libraries/ghc-internal/src/GHC/Internal/Pack.hs
• libraries/ghc-prim/GHC/Prim/Exception.hs → libraries/ghc-internal/src/GHC/Internal/Prim/Exception.hs
• libraries/ghc-prim/GHC/Prim/Ext.hs → libraries/ghc-internal/src/GHC/Internal/Prim/Ext.hs
• libraries/ghc-prim/GHC/Prim/Panic.hs → libraries/ghc-internal/src/GHC/Internal/Prim/Panic.hs
• libraries/ghc-prim/GHC/Prim/PtrEq.hs → libraries/ghc-internal/src/GHC/Internal/Prim/PtrEq.hs
• libraries/ghc-internal/src/GHC/Internal/Profiling.hs
• libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
• + libraries/ghc-internal/src/GHC/Internal/RTS/Flags/Test.hsc
• libraries/ghc-internal/src/GHC/Internal/Read.hs
• libraries/ghc-internal/src/GHC/Internal/Real.hs
• libraries/ghc-internal/src/GHC/Internal/Real.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Records.hs
• libraries/ghc-internal/src/GHC/Internal/ResponseFile.hs
• libraries/ghc-internal/src/GHC/Internal/Show.hs
• libraries/ghc-internal/src/GHC/Internal/Stack.hs
• libraries/ghc-internal/src/GHC/Internal/Stack.hs-boot
• + libraries/ghc-internal/src/GHC/Internal/Stack/Annotation.hs
• − libraries/ghc-internal/src/GHC/Internal/Stack/CCS.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Stack/CloneStack.hs
• libraries/ghc-heap/GHC/Exts/Stack/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Stack/Constants.hsc
• + libraries/ghc-internal/src/GHC/Internal/Stack/ConstantsProf.hsc
• + libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
• libraries/ghc-internal/src/GHC/Internal/Stack/Types.hs
• libraries/ghc-internal/src/GHC/Internal/System/Environment/ExecutablePath.hsc
• libraries/ghc-internal/src/GHC/Internal/System/IO.hs
• libraries/ghc-internal/src/GHC/Internal/System/IO/Error.hs
• libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs
• + libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs
• libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadP.hs
• libraries/ghc-prim/GHC/Tuple.hs → libraries/ghc-internal/src/GHC/Internal/Tuple.hs
• libraries/ghc-internal/src/GHC/Internal/Type/Reflection.hs
• libraries/ghc-internal/src/GHC/Internal/TypeError.hs
• libraries/ghc-internal/src/GHC/Internal/TypeLits.hs
• libraries/ghc-internal/src/GHC/Internal/TypeLits/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/TypeNats.hs
• libraries/ghc-internal/src/GHC/Internal/TypeNats/Internal.hs
• libraries/ghc-prim/GHC/Types.hs → libraries/ghc-internal/src/GHC/Internal/Types.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/DerivedCoreProperties.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/GeneralCategory.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleLowerCaseMapping.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleTitleCaseMapping.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleUpperCaseMapping.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Version.hs
• libraries/ghc-internal/src/GHC/Internal/Unsafe/Coerce.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Exports.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Flag.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Imports.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Types.hs
• libraries/ghc-internal/src/GHC/Internal/Word.hs
• + libraries/ghc-internal/tests/Makefile
• rts/version.c → libraries/ghc-internal/tests/all.T
• + libraries/ghc-internal/tests/backtraces/Makefile
• + libraries/ghc-internal/tests/backtraces/T14532a.hs
• + libraries/ghc-internal/tests/backtraces/T14532a.stdout
• + libraries/ghc-internal/tests/backtraces/T14532b.hs
• + libraries/ghc-internal/tests/backtraces/T14532b.stdout
• + libraries/ghc-internal/tests/backtraces/T26507.hs
• + libraries/ghc-internal/tests/backtraces/T26507.stderr
• + libraries/ghc-internal/tests/backtraces/all.T
• + libraries/ghc-internal/tests/stack-annotation/Makefile
• + libraries/ghc-internal/tests/stack-annotation/TestUtils.hs
• + libraries/ghc-internal/tests/stack-annotation/all.T
• + libraries/ghc-internal/tests/stack-annotation/ann_frame001.hs
• + libraries/ghc-internal/tests/stack-annotation/ann_frame001.stdout
• + libraries/ghc-internal/tests/stack-annotation/ann_frame002.hs
• + libraries/ghc-internal/tests/stack-annotation/ann_frame002.stdout
• + libraries/ghc-internal/tests/stack-annotation/ann_frame003.hs
• + libraries/ghc-internal/tests/stack-annotation/ann_frame003.stdout
• + libraries/ghc-internal/tests/stack-annotation/ann_frame004.hs
• + libraries/ghc-internal/tests/stack-annotation/ann_frame004.stdout
• + libraries/ghc-internal/tools/ucd2haskell/exe/Generator/ByteString.hs
• + libraries/ghc-internal/tools/ucd2haskell/exe/Generator/GeneralCategory.hs
• + libraries/ghc-internal/tools/ucd2haskell/exe/Generator/RangeSwitch.hs
• + libraries/ghc-internal/tools/ucd2haskell/exe/Generator/WordEncoding.hs
• − libraries/ghc-internal/tools/ucd2haskell/exe/Parser/Text.hs
• libraries/ghc-internal/tools/ucd2haskell/exe/UCD2Haskell.hs
• + libraries/ghc-internal/tools/ucd2haskell/exe/UCD2Haskell/ModuleGenerators.hs
• libraries/ghc-internal/tools/ucd2haskell/ucd.sh
• libraries/ghc-internal/tools/ucd2haskell/ucd2haskell.cabal
• libraries/ghc-internal/tools/ucd2haskell/unicode_version
• + libraries/ghc-prim/Dummy.hs
• − libraries/ghc-prim/Setup.hs
• libraries/ghc-prim/changelog.md
• libraries/ghc-prim/ghc-prim.cabal
• libraries/ghci/GHCi/BinaryArray.hs
• libraries/ghci/GHCi/BreakArray.hs
• libraries/ghci/GHCi/CreateBCO.hs
• + libraries/ghci/GHCi/Debugger.hs
• libraries/ghci/GHCi/InfoTable.hsc
• libraries/ghci/GHCi/Message.hs
• libraries/ghci/GHCi/ObjLink.hs
• libraries/ghci/GHCi/ResolvedBCO.hs
• libraries/ghci/GHCi/Run.hs
• libraries/ghci/GHCi/Server.hs
• libraries/ghci/GHCi/Signals.hs
• libraries/ghci/GHCi/TH.hs
• libraries/ghci/GHCi/TH/Binary.hs
• libraries/ghci/ghci.cabal.in
• libraries/haskeline
• libraries/hpc
• libraries/integer-gmp/integer-gmp.cabal
• libraries/integer-gmp/src/GHC/Integer/GMP/Internals.hs
• libraries/os-string
• libraries/parsec
• libraries/process
• libraries/semaphore-compat
• libraries/stm
• + libraries/template-haskell-lift
• + libraries/template-haskell-quasiquoter
• libraries/template-haskell/Language/Haskell/TH/Lib.hs
• − libraries/template-haskell/Language/Haskell/TH/Lib/Internal.hs
• libraries/template-haskell/Language/Haskell/TH/Ppr.hs
• libraries/template-haskell/Language/Haskell/TH/PprLib.hs
• libraries/template-haskell/Language/Haskell/TH/Quote.hs
• libraries/template-haskell/Language/Haskell/TH/Syntax.hs
• libraries/template-haskell/changelog.md
• libraries/template-haskell/template-haskell.cabal.in
• libraries/template-haskell/tests/all.T
• + libraries/template-haskell/tests/dataToCodeQUnit.hs
• + libraries/template-haskell/tests/dataToCodeQUnit.stdout
• libraries/template-haskell/vendored-filepath/System/FilePath.hs
• libraries/terminfo
• libraries/text
• libraries/time
• libraries/transformers
• libraries/unix
• linters/lint-codes/LintCodes/Coverage.hs
• linters/lint-codes/LintCodes/Static.hs
• linters/lint-codes/Main.hs
• linters/lint-notes/Main.hs
• linters/lint-whitespace/lint-whitespace.cabal
• llvm-targets
• m4/find_ld.m4
• m4/find_llvm_prog.m4
• m4/find_merge_objects.m4
• m4/find_python.m4
• m4/fp_cc_supports_target.m4
• m4/fp_check_pthreads.m4
• m4/fp_cmm_cpp_cmd_with_args.m4
• m4/fp_find_cxx_std_lib.m4
• m4/fp_find_libdw.m4
• m4/fp_gcc_supports_no_pie.m4
• − m4/fp_set_cflags_c99.m4
• − m4/fp_settings.m4
• m4/fp_setup_project_version.m4
• m4/fp_setup_windows_toolchain.m4
• − m4/fp_visibility_hidden.m4
• m4/fptools_alex.m4
• m4/fptools_happy.m4
• m4/fptools_set_c_ld_flags.m4
• m4/fptools_set_haskell_platform_vars.m4
• m4/fptools_set_platform_vars.m4
• m4/ghc_adjustors_method.m4
• m4/ghc_llvm_target.m4
• m4/ghc_tables_next_to_code.m4
• m4/ghc_toolchain.m4
• m4/prep_target_file.m4
• + m4/subst_tooldir.m4
• mk/get-win32-tarballs.py
• mk/hsc2hs.in
• nofib
• + rts/AllocArray.c
• + rts/AllocArray.h
• rts/Apply.cmm
• rts/AutoApply.h
• + rts/AutoApplyVecs.h
• rts/BeginPrivate.h
• + rts/BuiltinClosures.c
• + rts/BuiltinClosures.h
• rts/Capability.c
• rts/Capability.h
• rts/CheckUnload.c
• + rts/CheckVectorSupport.c
• + rts/CheckVectorSupport.h
• rts/CloneStack.c
• rts/CloneStack.h
• rts/ClosureFlags.c
• + rts/ClosureTable.c
• + rts/ClosureTable.h
• rts/Compact.cmm
• rts/ContinuationOps.cmm
• rts/Disassembler.c
• rts/EndPrivate.h
• rts/Exception.cmm
• rts/ExecPage.c
• rts/Globals.c
• rts/Hash.c
• rts/Hash.h
• rts/Heap.c
• rts/HeapStackCheck.cmm
• rts/Hpc.c
• rts/IOManager.c
• rts/IOManager.h
• rts/IOManagerInternals.h
• rts/IPE.c
• rts/Inlines.c
• rts/Interpreter.c
• rts/Interpreter.h
• + rts/Jumps.h
• + rts/Jumps_D.cmm
• + rts/Jumps_V16.cmm
• + rts/Jumps_V32.cmm
• + rts/Jumps_V64.cmm
• rts/LdvProfile.c
• rts/Linker.c
• rts/LinkerInternals.h
• rts/Messages.c
• rts/PathUtils.c
• rts/PathUtils.h
• rts/Prelude.h
• rts/PrimOps.cmm
• rts/Printer.c
• rts/ProfHeap.c
• rts/Profiling.c
• rts/RetainerProfile.c
• rts/RetainerSet.c
• rts/RtsAPI.c
• − rts/RtsDllMain.c
• − rts/RtsDllMain.h
• rts/RtsFlags.c
• rts/RtsMain.c
• rts/RtsMessages.c
• rts/RtsSignals.h
• rts/RtsStartup.c
• rts/RtsSymbols.c
• rts/RtsSymbols.h
• + rts/RtsToHsIface.c
• rts/RtsUtils.c
• rts/Schedule.c
• rts/StgCRun.c
• rts/StgCRunAsm.S
• rts/StgMiscClosures.cmm
• rts/StgStdThunks.cmm
• rts/Task.c
• rts/Task.h
• rts/ThreadLabels.c
• rts/ThreadPaused.c
• rts/Threads.c
• rts/Ticky.c
• + rts/TimeoutQueue.c
• + rts/TimeoutQueue.h
• rts/Timer.c
• rts/Trace.c
• rts/Trace.h
• rts/TraverseHeap.c
• rts/Updates.h
• rts/Weak.c
• rts/adjustor/LibffiAdjustor.c
• rts/adjustor/NativeAmd64Asm.S
• rts/adjustor/NativeAmd64MingwAsm.S
• rts/adjustor/Nativei386.c
• rts/adjustor/Nativei386Asm.S
• rts/configure.ac
• rts/eventlog/EventLog.c
• rts/eventlog/EventLog.h
• − rts/external-symbols.list.in
• rts/include/Cmm.h
• rts/include/HsFFI.h
• rts/include/Rts.h
• rts/include/RtsAPI.h
• rts/include/Stg.h
• rts/include/rts/Bytecodes.h
• rts/include/rts/Config.h
• rts/include/rts/Constants.h
• rts/include/rts/Flags.h
• rts/include/rts/Globals.h
• rts/include/rts/IPE.h
• rts/include/rts/NonMoving.h
• rts/include/rts/OSThreads.h
• + rts/include/rts/RtsToHsIface.h
• rts/include/rts/StableName.h
• rts/include/rts/StablePtr.h
• rts/include/rts/Threads.h
• rts/include/rts/Ticky.h
• rts/include/rts/Types.h
• rts/include/rts/prof/CCS.h
• rts/include/rts/storage/Block.h
• rts/include/rts/storage/ClosureTypes.h
• rts/include/rts/storage/Closures.h
• rts/include/rts/storage/GC.h
• rts/include/rts/storage/Heap.h
• rts/include/rts/storage/HeapAlloc.h
• rts/include/rts/storage/InfoTables.h
• rts/include/rts/storage/TSO.h
• − rts/include/stg/DLL.h
• rts/include/stg/MachRegs.h
• rts/include/stg/MachRegs/loongarch64.h
• rts/include/stg/MachRegs/ppc.h
• rts/include/stg/MachRegs/riscv64.h
• rts/include/stg/MachRegs/x86.h
• rts/include/stg/MiscClosures.h
• rts/include/stg/Prim.h
• rts/include/stg/SMP.h
• rts/js/environment.js
• rts/js/globals.js
• rts/js/mem.js
• rts/js/profiling.js
• rts/js/string.js
• rts/js/verify.js
• rts/linker/Elf.c
• rts/linker/ElfTypes.h
• rts/linker/LoadArchive.c
• rts/linker/LoadNativeObjPosix.c
• rts/linker/M32Alloc.c
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• rts/linker/MachO.c
• rts/linker/MachOTypes.h
• rts/linker/PEi386.c
• rts/linker/PEi386.h
• + rts/linker/ProddableBlocks.c
• + rts/linker/ProddableBlocks.h
• rts/linker/SymbolExtras.c
• rts/linker/SymbolExtras.h
• rts/linker/elf_got.c
• rts/linker/elf_plt.c
• rts/linker/elf_plt.h
• + rts/linker/elf_plt_riscv64.c
• + rts/linker/elf_plt_riscv64.h
• rts/linker/elf_reloc.c
• rts/linker/elf_reloc.h
• rts/linker/elf_reloc_aarch64.c
• rts/linker/elf_reloc_aarch64.h
• + rts/linker/elf_reloc_riscv64.c
• + rts/linker/elf_reloc_riscv64.h
• rts/linker/macho/plt.c
• rts/posix/OSMem.c
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• + rts/posix/Poll.c
• + rts/posix/Poll.h
• rts/posix/Signals.c
• + rts/posix/Timeout.c
• + rts/posix/Timeout.h
• rts/posix/ticker/Pthread.c
• rts/posix/ticker/TimerFd.c
• libraries/ghc-prim/cbits/atomic.c → rts/prim/atomic.c
• libraries/ghc-prim/cbits/bitrev.c → rts/prim/bitrev.c
• libraries/ghc-prim/cbits/bswap.c → rts/prim/bswap.c
• libraries/ghc-prim/cbits/clz.c → rts/prim/clz.c
• libraries/ghc-prim/cbits/ctz.c → rts/prim/ctz.c
• + rts/prim/int64x2minmax.c
• libraries/ghc-prim/cbits/longlong.c → rts/prim/longlong.c
• libraries/ghc-prim/cbits/mulIntMayOflo.c → rts/prim/mulIntMayOflo.c
• libraries/ghc-prim/cbits/pdep.c → rts/prim/pdep.c
• libraries/ghc-prim/cbits/pext.c → rts/prim/pext.c
• libraries/ghc-prim/cbits/popcnt.c → rts/prim/popcnt.c
• + rts/prim/vectorQuotRem.c
• libraries/ghc-prim/cbits/word2float.c → rts/prim/word2float.c
• rts/rts.buildinfo.in
• rts/rts.cabal
• rts/sm/BlockAlloc.c
• rts/sm/Compact.c
• rts/sm/Evac.c
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• rts/sm/Sanity.c
• rts/sm/Scav.c
• rts/sm/Storage.c
• rts/sm/Storage.h
• rts/wasm/JSFFI.c
• rts/wasm/OSMem.c
• rts/wasm/StgRun.c
• rts/wasm/Wasm.S
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• rts/wasm/jsval.cmm
• rts/wasm/scheduler.cmm
• rts/win32/AsyncWinIO.c
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• rts/win32/libHSghc-internal.def
• rts/win32/libHSghc-prim.def
• rts/win32/veh_excn.c
• rts/xxhash.h
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• testsuite/config/ghc
• testsuite/driver/cpu_features.py
• + testsuite/driver/cpuinfo.py
• testsuite/driver/junit.py
• testsuite/driver/perf_notes.py
• testsuite/driver/runtests.py
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• testsuite/mk/test.mk
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• + testsuite/tests/bytecode/T24634/T24634a.stdout
• + testsuite/tests/bytecode/T24634/T24634b.stdout
• testsuite/tests/bytecode/T24634/all.T
• testsuite/tests/bytecode/T24634/hello.c → testsuite/tests/bytecode/T24634/hello_c.c
• testsuite/tests/bytecode/T24634/hello.h → testsuite/tests/bytecode/T24634/hello_c.h
• + testsuite/tests/bytecode/T25090/A.hs
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• + testsuite/tests/bytecode/T25090/C.hs
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• + testsuite/tests/concurrent/should_run/T21969.hs
• testsuite/tests/ghc-api/settings-escape/ghc-install-folder/lib/.gitkeep → testsuite/tests/concurrent/should_run/T21969.stdout
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• testsuite/tests/rename/should_compile/T4478.hs
• testsuite/tests/rename/should_compile/T7167.hs
• testsuite/tests/rename/should_compile/T7167.stderr
• testsuite/tests/rename/should_compile/all.T
• testsuite/tests/rename/should_compile/rn025.hs
• testsuite/tests/rename/should_compile/rn027.hs
• testsuite/tests/rename/should_compile/rn031.hs
• testsuite/tests/rename/should_compile/rn039.ghc.stderr
• testsuite/tests/rename/should_compile/rn060.hs
• testsuite/tests/rename/should_fail/Or3.hs
• testsuite/tests/rename/should_fail/Or3.stderr
• testsuite/tests/rename/should_fail/SimilarNamesImport.stderr
• + testsuite/tests/rename/should_fail/T12488a.hs
• + testsuite/tests/rename/should_fail/T12488a.stderr
• + testsuite/tests/rename/should_fail/T12488a_foo.hs
• + testsuite/tests/rename/should_fail/T12488a_foo.stderr
• + testsuite/tests/rename/should_fail/T12488e.hs
• + testsuite/tests/rename/should_fail/T12488e.stderr
• + testsuite/tests/rename/should_fail/T12488g.hs
• + testsuite/tests/rename/should_fail/T12488g.stderr
• testsuite/tests/rename/should_fail/T12686a.stderr
• testsuite/tests/rename/should_fail/T12686c.stderr
• testsuite/tests/rename/should_fail/T15487.stderr
• testsuite/tests/rename/should_fail/T15828.stderr
• testsuite/tests/rename/should_fail/T16114.stderr
• testsuite/tests/rename/should_fail/T16635b.stderr
• testsuite/tests/rename/should_fail/T17594b.hs
• testsuite/tests/rename/should_fail/T17594b.stderr
• + testsuite/tests/rename/should_fail/T17594b_th.hs
• + testsuite/tests/rename/should_fail/T17594b_th.stderr
• testsuite/tests/rename/should_fail/T18240a.stderr
• testsuite/tests/rename/should_fail/T18740a.stderr
• testsuite/tests/rename/should_fail/T19843c.stderr
• testsuite/tests/rename/should_fail/T19843h.stderr
• testsuite/tests/rename/should_fail/T22478b.hs
• testsuite/tests/rename/should_fail/T22478b.stderr
• testsuite/tests/rename/should_fail/T22478e.stderr
• testsuite/tests/rename/should_fail/T22478f.stderr
• + testsuite/tests/rename/should_fail/T22581a.hs
• + testsuite/tests/rename/should_fail/T22581a.stderr
• + testsuite/tests/rename/should_fail/T22581a_helper.hs
• + testsuite/tests/rename/should_fail/T22581b.hs
• + testsuite/tests/rename/should_fail/T22581b.stderr
• + testsuite/tests/rename/should_fail/T22581b_helper.hs
• + testsuite/tests/rename/should_fail/T22688.hs
• + testsuite/tests/rename/should_fail/T22688.stderr
• + testsuite/tests/rename/should_fail/T23501_fail.hs
• + testsuite/tests/rename/should_fail/T23501_fail.stderr
• + testsuite/tests/rename/should_fail/T23501_fail_ext.hs
• + testsuite/tests/rename/should_fail/T23501_fail_ext.stderr
• testsuite/tests/rename/should_fail/T23510a.hs
• testsuite/tests/rename/should_fail/T23510a.stderr
• testsuite/tests/rename/should_fail/T23740i.stderr
• + testsuite/tests/rename/should_fail/T23982.hs
• + testsuite/tests/rename/should_fail/T23982.stderr
• + testsuite/tests/rename/should_fail/T23982_aux.hs
• + testsuite/tests/rename/should_fail/T23982b.hs
• + testsuite/tests/rename/should_fail/T23982b.stderr
• + testsuite/tests/rename/should_fail/T23982b_aux.hs
• + testsuite/tests/rename/should_fail/T25056.hs
• + testsuite/tests/rename/should_fail/T25056.stderr
• + testsuite/tests/rename/should_fail/T25056a.hs
• + testsuite/tests/rename/should_fail/T25056b.hs
• + testsuite/tests/rename/should_fail/T25437.hs
• + testsuite/tests/rename/should_fail/T25437.stderr
• + testsuite/tests/rename/should_fail/T25877.hs
• + testsuite/tests/rename/should_fail/T25877.stderr
• + testsuite/tests/rename/should_fail/T25877_aux.hs
• + testsuite/tests/rename/should_fail/T25899e1.hs
• + testsuite/tests/rename/should_fail/T25899e1.stderr
• + testsuite/tests/rename/should_fail/T25899e2.hs
• + testsuite/tests/rename/should_fail/T25899e2.stderr
• + testsuite/tests/rename/should_fail/T25899e3.hs
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• + testsuite/tests/rename/should_fail/T25899e_helper.hs
• + testsuite/tests/rename/should_fail/T25899f.hs
• + testsuite/tests/rename/should_fail/T25899f.stderr
• + testsuite/tests/rename/should_fail/T25899f_helper.hs
• + testsuite/tests/rename/should_fail/T25984b.hs
• + testsuite/tests/rename/should_fail/T25984b.stderr
• + testsuite/tests/rename/should_fail/T25991b1.hs
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• + testsuite/tests/rename/should_fail/T25991b2.hs
• + testsuite/tests/rename/should_fail/T25991b2.stderr
• + testsuite/tests/rename/should_fail/T25991b_helper.hs
• testsuite/tests/rename/should_fail/T5001b.stderr
• testsuite/tests/rename/should_fail/T5951.stderr
• testsuite/tests/rename/should_fail/T6148d.stderr
• testsuite/tests/rename/should_fail/T9006.stderr
• testsuite/tests/rename/should_fail/all.T
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• testsuite/tests/rename/should_fail/rnfail051.hs
• testsuite/tests/rename/should_fail/rnfail051.stderr
• + testsuite/tests/rep-poly/NoEtaRequired.hs
• testsuite/tests/rep-poly/RepPolyArgument.stderr
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• testsuite/tests/rep-poly/RepPolyLeftSection2.stderr
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• testsuite/tests/rep-poly/RepPolyRightSection.stderr
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• testsuite/tests/rep-poly/T11473.stderr
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• testsuite/tests/rep-poly/T13233.stderr
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• testsuite/tests/rep-poly/T14561b.stderr
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• testsuite/tests/rep-poly/T19615.stderr
• testsuite/tests/rep-poly/T19709b.stderr
• testsuite/tests/rep-poly/T20363_show_co.stderr
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• testsuite/tests/rep-poly/T23153.stderr
• + testsuite/tests/rep-poly/T23153b.hs
• testsuite/tests/rep-poly/T23154.stderr
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• + testsuite/tests/rep-poly/T23883c.hs
• + testsuite/tests/rep-poly/T23883c.stderr
• testsuite/tests/rep-poly/T23903.stderr
• + testsuite/tests/rep-poly/T26107.hs
• testsuite/tests/rep-poly/UnliftedNewtypesCoerceFail.stderr
• testsuite/tests/rep-poly/all.T
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• testsuite/tests/roles/should_compile/T8958.stderr
• testsuite/tests/roles/should_fail/Roles10.stderr
• testsuite/tests/roles/should_fail/RolesIArray.stderr
• + testsuite/tests/rts/ClosureTable.hs
• + testsuite/tests/rts/ClosureTable_c.c
• testsuite/tests/rts/Makefile
• testsuite/tests/rts/T13082/Makefile
• testsuite/tests/rts/T13082/T13082_fail.stderr → testsuite/tests/rts/T13082/T13082_fail.stdout
• testsuite/tests/rts/T13832.stderr
• testsuite/tests/rts/T13894.hs
• + testsuite/tests/rts/T14497-compact.hs
• + testsuite/tests/rts/T14497-compact.stdout
• testsuite/tests/rts/T1791/Makefile
• + testsuite/tests/rts/T20201a.hs
• + testsuite/tests/rts/T20201a.stderr
• + testsuite/tests/rts/T20201b.hs
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• + testsuite/tests/rts/T22859.hs
• + testsuite/tests/rts/T22859.stderr
• testsuite/tests/rts/T23221.hs
• + testsuite/tests/rts/T25198/T25198.hs
• + testsuite/tests/rts/T25198/T25198.stderr
• + testsuite/tests/rts/T25198/all.T
• + testsuite/tests/rts/T25232.hs
• + testsuite/tests/rts/T25280.hs
• + testsuite/tests/rts/T25560.hs
• testsuite/tests/rts/T2783.stderr
• testsuite/tests/rts/T7040_ghci_c.c
• testsuite/tests/rts/T7087.stderr
• testsuite/tests/rts/T7636.stderr
• + testsuite/tests/rts/TestProddableBlockSet.c
• + testsuite/tests/rts/TimeoutQueue.c
• + testsuite/tests/rts/TimeoutQueue.stdout
• testsuite/tests/rts/all.T
• testsuite/tests/rts/cloneStackLib.c
• testsuite/tests/rts/continuations/cont_missing_prompt_err.stderr
• testsuite/tests/rts/exec_signals_child.c
• testsuite/tests/rts/flags/all.T
• testsuite/tests/rts/ipe/IpeStats/Makefile
• testsuite/tests/rts/ipe/T24005/t24005.hs
• + testsuite/tests/rts/ipe/distinct-tables/Main.hs
• + testsuite/tests/rts/ipe/distinct-tables/Makefile
• + testsuite/tests/rts/ipe/distinct-tables/X.hs
• + testsuite/tests/rts/ipe/distinct-tables/all.T
• + testsuite/tests/rts/ipe/distinct-tables/distinct_tables01.stdout
• + testsuite/tests/rts/ipe/distinct-tables/distinct_tables02.stdout
• + testsuite/tests/rts/ipe/distinct-tables/distinct_tables03.stdout
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• + testsuite/tests/rts/ipe/distinct-tables/distinct_tables13.stdout
• testsuite/tests/rts/ipe/ipeMap.c
• testsuite/tests/rts/ipe/ipe_lib.c
• testsuite/tests/rts/linker/Makefile
• testsuite/tests/rts/linker/T11223/Makefile
• testsuite/tests/rts/linker/T11223/T11223_link_order_a_b_2_fail.stderr
• − testsuite/tests/rts/linker/T11223/T11223_link_order_a_b_2_fail.stderr-ws-32-mingw32
• testsuite/tests/rts/linker/T11223/T11223_link_order_a_b_2_fail.stderr-ws-64-mingw32
• testsuite/tests/rts/linker/T11223/T11223_simple_duplicate_lib.stderr
• − testsuite/tests/rts/linker/T11223/T11223_simple_duplicate_lib.stderr-ws-32-mingw32
• testsuite/tests/rts/linker/T11223/T11223_simple_duplicate_lib.stderr-ws-64-mingw32
• testsuite/tests/rts/linker/T11223/all.T
• + testsuite/tests/rts/linker/T25191.hs
• + testsuite/tests/rts/linker/T25191.stdout
• + testsuite/tests/rts/linker/T25191_foo1.c
• + testsuite/tests/rts/linker/T25191_foo2.c
• testsuite/tests/rts/linker/T2615.hs
• testsuite/tests/rts/linker/T7072-obj.c → testsuite/tests/rts/linker/T7072.c
• testsuite/tests/rts/linker/all.T
• testsuite/tests/rts/linker/T7072-main.c → testsuite/tests/rts/linker/load-object.c
• + testsuite/tests/rts/linker/reloc-none.c
• + testsuite/tests/rts/linker/reloc-none.stderr
• − testsuite/tests/rts/outofmem.stderr-i386-apple-darwin
• − testsuite/tests/rts/outofmem.stderr-i386-unknown-mingw32
• − testsuite/tests/rts/outofmem.stderr-powerpc-apple-darwin
• testsuite/tests/rts/pause-resume/list_threads_and_misc_roots_c.c
• testsuite/tests/runghc/T7859.stderr
• testsuite/tests/runghc/T7859.stderr-mingw32
• testsuite/tests/safeHaskell/check/pkg01/all.T
• testsuite/tests/safeHaskell/flags/SafeFlags17.stderr
• testsuite/tests/safeHaskell/ghci/p12.stderr
• testsuite/tests/safeHaskell/ghci/p5.stderr
• testsuite/tests/safeHaskell/safeLanguage/SafeLang09.stderr
• testsuite/tests/safeHaskell/safeLanguage/SafeLang15.stderr
• testsuite/tests/safeHaskell/safeLanguage/SafeLang18.hs
• testsuite/tests/safeHaskell/unsafeLibs/GoodImport03.hs
• testsuite/tests/safeHaskell/unsafeLibs/T21433.stderr
• testsuite/tests/saks/should_fail/T16722.stderr
• testsuite/tests/saks/should_fail/saks_fail003.stderr
• testsuite/tests/showIface/DocsInHiFile1.stdout
• testsuite/tests/showIface/DocsInHiFileTH.stdout
• testsuite/tests/showIface/HaddockIssue849.stdout
• testsuite/tests/showIface/HaddockOpts.stdout
• testsuite/tests/showIface/HaddockSpanIssueT24378.stdout
• testsuite/tests/showIface/LanguageExts.stdout
• testsuite/tests/showIface/MagicHashInHaddocks.stdout
• testsuite/tests/showIface/NoExportList.stdout
• testsuite/tests/showIface/Orphans.stdout
• testsuite/tests/showIface/PragmaDocs.stdout
• testsuite/tests/showIface/ReExports.stdout
• + testsuite/tests/simd/should_run/Simd009b.hs
• + testsuite/tests/simd/should_run/Simd009c.hs
• testsuite/tests/unboxedsums/T22187.hs → testsuite/tests/simd/should_run/T22187.hs
• testsuite/tests/unboxedsums/T22187_run.hs → testsuite/tests/simd/should_run/T22187_run.hs
• testsuite/tests/unboxedsums/T22187_run.stdout → testsuite/tests/simd/should_run/T22187_run.stdout
• + testsuite/tests/simd/should_run/T25062_V16.hs
• + testsuite/tests/simd/should_run/T25062_V16.stdout
• + testsuite/tests/simd/should_run/T25062_V32.hs
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• + testsuite/tests/simd/should_run/T25486.stdout
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• + testsuite/tests/simd/should_run/T25659.stdout
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• + testsuite/tests/simd/should_run/doublex2_arith.stdout
• + testsuite/tests/simd/should_run/doublex2_arith_baseline.hs
• + testsuite/tests/simd/should_run/doublex2_arith_baseline.stdout
• + testsuite/tests/simd/should_run/doublex2_fma.hs
• + testsuite/tests/simd/should_run/doublex2_fma.stdout
• + testsuite/tests/simd/should_run/doublex2_shuffle.hs
• + testsuite/tests/simd/should_run/doublex2_shuffle.stdout
• + testsuite/tests/simd/should_run/doublex2_shuffle_baseline.hs
• + testsuite/tests/simd/should_run/doublex2_shuffle_baseline.stdout
• + testsuite/tests/simd/should_run/floatx4_arith.hs
• + testsuite/tests/simd/should_run/floatx4_arith.stdout
• + testsuite/tests/simd/should_run/floatx4_arith_baseline.hs
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• + testsuite/tests/simd/should_run/floatx4_fma.hs
• + testsuite/tests/simd/should_run/floatx4_fma.stdout
• + testsuite/tests/simd/should_run/floatx4_shuffle.hs
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• + testsuite/tests/simd/should_run/floatx4_shuffle_baseline.hs
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• + testsuite/tests/simd/should_run/int16x8_shuffle_baseline.hs
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• + testsuite/tests/simd/should_run/int32x4_arith_baseline.hs
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• + testsuite/tests/simd/should_run/int64x2_shuffle.hs
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• + testsuite/tests/simd/should_run/int64x2_shuffle_baseline.hs
• + testsuite/tests/simd/should_run/int64x2_shuffle_baseline.stdout
• + testsuite/tests/simd/should_run/int8x16_arith.hs
• + testsuite/tests/simd/should_run/int8x16_arith.stdout
• + testsuite/tests/simd/should_run/int8x16_arith_baseline.hs
• + testsuite/tests/simd/should_run/int8x16_arith_baseline.stdout
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• + testsuite/tests/simd/should_run/int8x16_basic_baseline.hs
• + testsuite/tests/simd/should_run/int8x16_basic_baseline.stdout
• + testsuite/tests/simd/should_run/int8x16_shuffle.hs
• + testsuite/tests/simd/should_run/int8x16_shuffle.stdout
• + testsuite/tests/simd/should_run/int8x16_shuffle_baseline.hs
• + testsuite/tests/simd/should_run/int8x16_shuffle_baseline.stdout
• + testsuite/tests/simd/should_run/simd000.hs
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• utils/haddock/CHANGES.md
• utils/haddock/CONTRIBUTING.md
• utils/haddock/Makefile
• utils/haddock/README.md
• utils/haddock/cabal.project
• utils/haddock/doc/cheatsheet/haddocks.md
• utils/haddock/doc/common-errors.rst
• utils/haddock/doc/conf.py
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• utils/haddock/doc/invoking.rst
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• utils/haddock/haddock-library/src/Documentation/Haddock/Doc.hs
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• utils/haddock/haddock-library/src/Documentation/Haddock/Parser/Monad.hs
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• − utils/runghc/Makefile
• − utils/runghc/runghc.wrapper
• − utils/unlit/Makefile

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