Berk Özkütük pushed to branch wip/ozkutuk/sprint-fun at Glasgow Haskell Compiler / GHC

Commits:

• 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
  

• 2b433a38
  by Berk Özkütük at 2025-06-07T17:35:42+02:00

  Disambiguate closures' printing from thunks (#23507)
  

• 35810d80
  by Berk Özkütük at 2025-06-07T17:36:59+02:00

  Only print function closures
  

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• 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/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.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/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/Type.hs
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/IfaceToCore.hs-boot
• compiler/GHC/JS/Make.hs
• compiler/GHC/JS/Opt/Expr.hs
• compiler/GHC/JS/Opt/Simple.hs
• compiler/GHC/JS/Ppr.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/Static.hs
• compiler/GHC/Llvm/Ppr.hs
• compiler/GHC/Llvm/Types.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.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/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/CSE.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/Lift/Analysis.hs
• compiler/GHC/Stg/Pipeline.hs
• compiler/GHC/Stg/Syntax.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/CgUtils.hs
• compiler/GHC/StgToCmm/Closure.hs
• compiler/GHC/StgToCmm/Config.hs
• compiler/GHC/StgToCmm/Expr.hs
• compiler/GHC/StgToCmm/Foreign.hs
• compiler/GHC/StgToCmm/Hpc.hs
• compiler/GHC/StgToCmm/Layout.hs
• compiler/GHC/StgToCmm/Lit.hs
• compiler/GHC/StgToCmm/Monad.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/TagCheck.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/Arg.hs
• compiler/GHC/StgToJS/CodeGen.hs
• compiler/GHC/StgToJS/Expr.hs
• compiler/GHC/StgToJS/ExprCtx.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/Sinker/Collect.hs
• compiler/GHC/StgToJS/Sinker.hs → compiler/GHC/StgToJS/Sinker/Sinker.hs
• + compiler/GHC/StgToJS/Sinker/StringsUnfloat.hs
• compiler/GHC/StgToJS/Symbols.hs
• compiler/GHC/StgToJS/Types.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/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/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/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/Constraint.hs
• compiler/GHC/Tc/Types/CtLoc.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/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/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/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/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/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/SafeHaskell.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/FM.hs
• compiler/GHC/Types/Var.hs
• 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/Env.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/State.hs
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/GlobalVars.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Misc.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Panic.hs
• compiler/GHC/Utils/Panic/Plain.hs
• compiler/GHC/Utils/Touch.hs
• compiler/GHC/Utils/Unique.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/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• + 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/Type.hs
• compiler/Language/Haskell/Syntax/Type.hs-boot
• compiler/Setup.hs
• compiler/cbits/genSym.c
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• − distrib/cross-port
• docs/users_guide/9.14.1-notes.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/eventlog-formats.rst
• docs/users_guide/expected-undocumented-flags.txt
• docs/users_guide/exts/control.rst
• docs/users_guide/exts/data_kinds.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/ffi.rst
• docs/users_guide/exts/instances.rst
• docs/users_guide/exts/linear_types.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/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/rewrite_rules.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/types.rst
• 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/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
• + 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/plan-9_10_1.json
• hadrian/bootstrap/plan-9_6_1.json
• hadrian/bootstrap/plan-9_6_2.json
• hadrian/bootstrap/plan-9_6_3.json
• hadrian/bootstrap/plan-9_6_4.json
• hadrian/bootstrap/plan-9_6_5.json
• hadrian/bootstrap/plan-9_6_6.json
• hadrian/bootstrap/plan-9_8_1.json
• hadrian/bootstrap/plan-9_8_2.json
• hadrian/bootstrap/plan-bootstrap-9_10_1.json
• hadrian/bootstrap/plan-bootstrap-9_6_1.json
• hadrian/bootstrap/plan-bootstrap-9_6_2.json
• hadrian/bootstrap/plan-bootstrap-9_6_3.json
• hadrian/bootstrap/plan-bootstrap-9_6_4.json
• hadrian/bootstrap/plan-bootstrap-9_6_5.json
• hadrian/bootstrap/plan-bootstrap-9_6_6.json
• hadrian/bootstrap/plan-bootstrap-9_8_1.json
• hadrian/bootstrap/plan-bootstrap-9_8_2.json
• hadrian/cabal.project
• 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/CommandLine.hs
• hadrian/src/Flavour.hs
• hadrian/src/Flavour/Type.hs
• hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
• hadrian/src/Hadrian/Haskell/Hash.hs
• hadrian/src/Hadrian/Utilities.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/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/Library.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/Configure.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Builders/RunTest.hs
• hadrian/src/Settings/Default.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/Warnings.hs
• hadrian/stack.yaml
• libffi-tarballs
• libraries/Cabal
• libraries/Win32
• libraries/array
• libraries/base/base.cabal.in
• libraries/base/changelog.md
• 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/Fix.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/List/NonEmpty.hs
• libraries/base/src/Data/Semigroup.hs
• libraries/base/src/GHC/Base.hs
• libraries/base/src/GHC/Exception.hs
• − libraries/base/src/GHC/ExecutionStack/Internal.hs
• libraries/base/src/GHC/Exts.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/RTS/Flags.hs
• libraries/base/src/GHC/Records.hs
• libraries/base/src/GHC/Stats.hs
• − libraries/base/src/GHC/TypeLits/Internal.hs
• − libraries/base/src/GHC/TypeNats/Internal.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/System/CPUTime/Windows.hsc
• 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/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.stderr
• + libraries/base/tests/T25066.hs
• + libraries/base/tests/T25066.stderr
• libraries/base/tests/all.T
• libraries/base/tests/assert.stderr
• libraries/base/tests/dynamic002.hs
• libraries/base/tests/foldableArray.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/deepseq
• libraries/directory
• libraries/exceptions
• libraries/file-io
• libraries/filepath
• − libraries/ghc-bignum/.gitignore
• + libraries/ghc-bignum/Dummy.hs
• − libraries/ghc-bignum/Setup.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/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/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/Utils/Encoding.hs
• libraries/ghc-boot/GHC/Utils/Encoding/UTF8.hs
• libraries/ghc-boot/ghc-boot.cabal.in
• libraries/ghc-compact/ghc-compact.cabal
• 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/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/RTS/Flags/Experimental.hs
• + libraries/ghc-experimental/src/GHC/Stats/Experimental.hs
• libraries/ghc-experimental/src/GHC/Wasm/Prim.hs
• libraries/ghc-experimental/src/Prelude/Experimental.hs
• libraries/ghc-heap/GHC/Exts/Heap.hs
• libraries/ghc-heap/GHC/Exts/Heap/Closures.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/Types.hsc
• libraries/ghc-heap/GHC/Exts/Heap/ProfInfo/PeekProfInfo_ProfilingEnabled.hsc
• libraries/ghc-heap/ghc-heap.cabal.in
• libraries/ghc-heap/tests/stack_big_ret.hs
• 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-prim/cbits/atomic.c → libraries/ghc-internal/cbits/atomic.c
• libraries/ghc-prim/cbits/bitrev.c → libraries/ghc-internal/cbits/bitrev.c
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• libraries/ghc-prim/cbits/clz.c → libraries/ghc-internal/cbits/clz.c
• libraries/ghc-prim/cbits/ctz.c → libraries/ghc-internal/cbits/ctz.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/cbits/int64x2minmax.c
• libraries/ghc-prim/cbits/longlong.c → libraries/ghc-internal/cbits/longlong.c
• libraries/ghc-prim/cbits/mulIntMayOflo.c → libraries/ghc-internal/cbits/mulIntMayOflo.c
• libraries/ghc-prim/cbits/pdep.c → libraries/ghc-internal/cbits/pdep.c
• libraries/ghc-prim/cbits/pext.c → libraries/ghc-internal/cbits/pext.c
• libraries/ghc-prim/cbits/popcnt.c → libraries/ghc-internal/cbits/popcnt.c
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• libraries/ghc-internal/configure.ac
• libraries/ghc-internal/ghc-internal.buildinfo.in
• 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-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/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
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• 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
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• libraries/ghc-internal/src/GHC/Internal/Char.hs
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• libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
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• libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
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• libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
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• 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
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• libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
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• 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
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• 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/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/ConsoleEvent.hsc
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• libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
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• 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/IO.hs
• libraries/ghc-internal/src/GHC/Internal/IO.hs-boot
• 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/Handle/FD.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/Types.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/SubSystem.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/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/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/CCS.hs-boot
• 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/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/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/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/tools/ucd2haskell/ucd.sh
• 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/BreakArray.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/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/transformers
• libraries/unix
• linters/lint-codes/LintCodes/Static.hs
• linters/lint-codes/Main.hs
• llvm-targets
• m4/find_ld.m4
• m4/fp_cc_supports_target.m4
• m4/fp_settings.m4
• m4/fp_setup_project_version.m4
• m4/fp_setup_windows_toolchain.m4
• m4/fptools_happy.m4
• m4/fptools_set_c_ld_flags.m4
• m4/fptools_set_platform_vars.m4
• m4/ghc_tables_next_to_code.m4
• m4/ghc_toolchain.m4
• nofib
• rts/Capability.c
• rts/Capability.h
• rts/CheckUnload.c
• rts/Disassembler.c
• rts/Exception.cmm
• rts/ExecPage.c
• rts/Hash.c
• rts/Hash.h
• rts/HeapStackCheck.cmm
• rts/IOManager.c
• rts/IPE.c
• rts/Interpreter.c
• rts/Interpreter.h
• rts/Linker.c
• rts/LinkerInternals.h
• rts/PathUtils.c
• rts/PathUtils.h
• rts/Prelude.h
• rts/PrimOps.cmm
• rts/Printer.c
• rts/ProfHeap.c
• rts/RtsAPI.c
• rts/RtsFlags.c
• rts/RtsMain.c
• rts/RtsSymbols.c
• rts/RtsUtils.c
• rts/Schedule.c
• rts/StgCRun.c
• rts/StgCRunAsm.S
• rts/StgMiscClosures.cmm
• rts/StgStdThunks.cmm
• rts/Task.h
• rts/Ticky.c
• rts/Updates.h
• rts/adjustor/NativeAmd64Asm.S
• rts/adjustor/NativeAmd64MingwAsm.S
• rts/adjustor/Nativei386.c
• rts/adjustor/Nativei386Asm.S
• rts/configure.ac
• rts/external-symbols.list.in
• rts/include/HsFFI.h
• rts/include/RtsAPI.h
• rts/include/Stg.h
• rts/include/rts/Bytecodes.h
• rts/include/rts/Config.h
• rts/include/rts/Flags.h
• rts/include/rts/IPE.h
• rts/include/rts/Threads.h
• rts/include/rts/Ticky.h
• rts/include/rts/storage/Closures.h
• rts/include/rts/storage/HeapAlloc.h
• rts/include/rts/storage/InfoTables.h
• rts/include/stg/MachRegs/loongarch64.h
• rts/include/stg/MachRegs/ppc.h
• rts/include/stg/MachRegs/riscv64.h
• rts/include/stg/Prim.h
• rts/js/environment.js
• rts/js/mem.js
• rts/js/string.js
• rts/js/verify.js
• rts/linker/Elf.c
• rts/linker/LoadNativeObjPosix.c
• rts/linker/MMap.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/elf_got.c
• rts/posix/ticker/TimerFd.c
• rts/rts.cabal
• rts/sm/Compact.c
• rts/sm/Evac.c
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• rts/sm/Storage.h
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• rts/wasm/jsval.cmm
• rts/wasm/scheduler.cmm
• rts/win32/libHSghc-prim.def
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• rts/xxhash.h
• testsuite/config/ghc
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• testsuite/driver/junit.py
• testsuite/driver/perf_notes.py
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• testsuite/driver/testlib.py
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• + testsuite/tests/rename/should_fail/T23982.hs
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• testsuite/tests/rename/should_fail/T25056.stderr
• testsuite/tests/rename/should_fail/T25056a.hs
• + testsuite/tests/rename/should_fail/T25437.hs
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• + testsuite/tests/rename/should_fail/T25899e1.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
• testsuite/tests/rename/should_fail/rn_dup.stderr
• testsuite/tests/rep-poly/RepPolyArgument.stderr
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• testsuite/tests/rep-poly/RepPolyBinder.stderr
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• testsuite/tests/rep-poly/RepPolyDoBody1.stderr
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• testsuite/tests/rep-poly/RepPolyInferPatBind.stderr
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• testsuite/tests/rep-poly/RepPolyTupleSection.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/T21906.stderr
• testsuite/tests/rep-poly/T23153.stderr
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• testsuite/tests/rep-poly/T23154.stderr
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• testsuite/tests/rep-poly/T23903.stderr
• testsuite/tests/rep-poly/UnliftedNewtypesCoerceFail.stderr
• testsuite/tests/rep-poly/all.T
• testsuite/tests/roles/should_compile/Roles1.stderr
• testsuite/tests/roles/should_compile/Roles13.stderr
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• testsuite/tests/roles/should_compile/Roles2.stderr
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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/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
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• testsuite/tests/rts/T1791/Makefile
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• + testsuite/tests/rts/T25198/all.T
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• 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/all.T
• testsuite/tests/rts/cloneStackLib.c
• testsuite/tests/rts/continuations/cont_missing_prompt_err.stderr
• testsuite/tests/rts/ipe/IpeStats/Makefile
• testsuite/tests/rts/ipe/T24005/t24005.hs
• 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/all.T
• testsuite/tests/runghc/T7859.stderr
• testsuite/tests/runghc/T7859.stderr-mingw32
• testsuite/tests/safeHaskell/check/pkg01/all.T
• testsuite/tests/safeHaskell/ghci/p12.stderr
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• testsuite/tests/safeHaskell/safeLanguage/SafeLang09.stderr
• testsuite/tests/safeHaskell/safeLanguage/SafeLang15.stderr
• testsuite/tests/safeHaskell/safeLanguage/SafeLang18.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
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• 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/T25062_V64.hs
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• testsuite/tests/simd/should_run/all.T
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• + testsuite/tests/simd/should_run/doublex2_arith.stdout
• + testsuite/tests/simd/should_run/doublex2_arith_baseline.hs
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• + testsuite/tests/simd/should_run/doublex2_fma.hs
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• + 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/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_arith.hs
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• + testsuite/tests/simd/should_run/int64x2_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
• + testsuite/tests/simd/should_run/int8x16_basic.hs
• + testsuite/tests/simd/should_run/int8x16_basic.stdout
• + 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
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• testsuite/tests/simd/should_run/simd006.hs
• + testsuite/tests/simd/should_run/simd_insert.hs
• + testsuite/tests/simd/should_run/simd_insert.stdout
• + testsuite/tests/simd/should_run/simd_insert_array.hs
• + testsuite/tests/simd/should_run/simd_insert_array.stdout
• + testsuite/tests/simd/should_run/simd_insert_array_baseline.hs
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• + testsuite/tests/simd/should_run/simd_insert_baseline.hs
• + testsuite/tests/simd/should_run/simd_insert_baseline.stdout
• + testsuite/tests/simd/should_run/word16x8_arith.hs
• + testsuite/tests/simd/should_run/word16x8_arith.stdout
• + testsuite/tests/simd/should_run/word16x8_arith_baseline.hs
• + testsuite/tests/simd/should_run/word16x8_arith_baseline.stdout
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• + testsuite/tests/simd/should_run/word16x8_basic_baseline.hs
• + testsuite/tests/simd/should_run/word16x8_basic_baseline.stdout
• + testsuite/tests/simd/should_run/word32x4_arith.hs
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• + testsuite/tests/simd/should_run/word32x4_arith_baseline.hs
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• + testsuite/tests/simd/should_run/word32x4_basic.hs
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• + testsuite/tests/simd/should_run/word32x4_basic_baseline.hs
• + testsuite/tests/simd/should_run/word32x4_basic_baseline.stdout
• + testsuite/tests/simd/should_run/word64x2_arith.hs
• + testsuite/tests/simd/should_run/word64x2_arith.stdout
• + testsuite/tests/simd/should_run/word64x2_arith_baseline.hs
• + testsuite/tests/simd/should_run/word64x2_arith_baseline.stdout
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• + testsuite/tests/simd/should_run/word8x16_arith.hs
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• + testsuite/tests/simd/should_run/word8x16_arith_baseline.hs
• + testsuite/tests/simd/should_run/word8x16_arith_baseline.stdout
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• testsuite/tests/simplCore/T9646/Main.hs
• testsuite/tests/simplCore/T9646/StrictPrim.hs
• + testsuite/tests/simplCore/should_compile/DsSpecPragmas.hs
• + testsuite/tests/simplCore/should_compile/DsSpecPragmas.stderr
• testsuite/tests/simplCore/should_compile/Makefile
• testsuite/tests/simplCore/should_compile/OpaqueNoCastWW.stderr
• testsuite/tests/simplCore/should_compile/RewriteHigherOrderPatterns.stderr
• testsuite/tests/simplCore/should_compile/T12603.stdout
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• testsuite/tests/simplCore/should_compile/T15186.hs
• testsuite/tests/simplCore/should_compile/T15186A.hs
• testsuite/tests/simplCore/should_compile/T15445.stderr
• testsuite/tests/simplCore/should_compile/T15631.stdout
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• testsuite/tests/simplCore/should_compile/T21851_2.stderr
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• testsuite/tests/simplCore/should_compile/T24229a.stderr
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• + testsuite/tests/simplCore/should_compile/T25965.hs
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• testsuite/tests/simplCore/should_compile/T3717.stderr
• testsuite/tests/simplCore/should_compile/T3772.stdout
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• testsuite/tests/simplCore/should_compile/all.T
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• testsuite/tests/simplCore/should_fail/T7411.stderr
• testsuite/tests/simplCore/should_fail/all.T
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• testsuite/tests/simplCore/should_run/T16066.stderr
• testsuite/tests/simplCore/should_run/T16893/T16893.stderr
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• testsuite/tests/simplStg/should_compile/all.T
• testsuite/tests/simplStg/should_compile/inferTags002.stderr
• testsuite/tests/simplStg/should_compile/inferTags003.stderr
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• testsuite/tests/simplStg/should_compile/inferTags004.stderr
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• + testsuite/tests/splice-imports/SI25Helper.hs
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• + testsuite/tests/splice-imports/SI36_C3.hs
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• testsuite/tests/typecheck/should_compile/T11462.hs → testsuite/tests/tcplugins/T11462.hs
• testsuite/tests/typecheck/should_compile/T11462_Plugin.hs → testsuite/tests/tcplugins/T11462_Plugin.hs
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• testsuite/tests/typecheck/should_compile/T11525_Plugin.hs → testsuite/tests/tcplugins/T11525_Plugin.hs
• testsuite/tests/tcplugins/all.T
• testsuite/tests/th/ClosedFam1TH.stderr
• + testsuite/tests/th/EmptyGuard.hs
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• + testsuite/tests/th/EmptyParStmt.hs
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• + testsuite/tests/typecheck/should_compile/T16234/ControlMonadClassesEffects.hs
• + testsuite/tests/typecheck/should_compile/T16234/ControlMonadClassesReader.hs
• + testsuite/tests/typecheck/should_compile/T16234/ControlMonadClassesState.hs
• + testsuite/tests/typecheck/should_compile/T16234/ControlMonadPrimitive.hs
• + testsuite/tests/typecheck/should_compile/T16234/DataPeano.hs
• + testsuite/tests/typecheck/should_compile/T16234/Main.hs
• + testsuite/tests/typecheck/should_compile/T16234/Makefile
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• testsuite/tests/typecheck/should_fail/T10495.hs
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• testsuite/tests/typecheck/should_fail/tcfail123.stderr
• testsuite/tests/typecheck/should_fail/tcfail132.stderr
• testsuite/tests/typecheck/should_fail/tcfail136.stderr
• testsuite/tests/typecheck/should_fail/tcfail146.stderr
• testsuite/tests/typecheck/should_fail/tcfail147.stderr
• testsuite/tests/typecheck/should_fail/tcfail148.stderr
• testsuite/tests/typecheck/should_fail/tcfail151.stderr
• testsuite/tests/typecheck/should_fail/tcfail159.stderr
• testsuite/tests/typecheck/should_fail/tcfail162.stderr
• testsuite/tests/typecheck/should_fail/tcfail169.stderr
• testsuite/tests/typecheck/should_fail/tcfail199.stderr
• testsuite/tests/typecheck/should_fail/tcfail200.stderr
• testsuite/tests/typecheck/should_fail/tcfail224.stderr
• testsuite/tests/typecheck/should_run/T10284.stderr
• testsuite/tests/typecheck/should_run/T11049.stderr
• testsuite/tests/typecheck/should_run/T11715.stderr
• testsuite/tests/typecheck/should_run/T13838.stderr
• testsuite/tests/typecheck/should_run/T21973a.stderr
• testsuite/tests/typecheck/should_run/T22510.stdout
• + testsuite/tests/typecheck/should_run/T25529.hs
• + testsuite/tests/typecheck/should_run/T25529.stdout
• + testsuite/tests/typecheck/should_run/T25998.hs
• + testsuite/tests/typecheck/should_run/T25998.stdout
• testsuite/tests/typecheck/should_run/T9497a-run.stderr
• testsuite/tests/typecheck/should_run/T9497b-run.stderr
• testsuite/tests/typecheck/should_run/T9497c-run.stderr
• testsuite/tests/typecheck/should_run/all.T
• testsuite/tests/unboxedsums/T12711.stdout
• testsuite/tests/unboxedsums/T20858.stdout
• testsuite/tests/unboxedsums/T20858b.stdout
• testsuite/tests/unboxedsums/unpack_sums_5.stderr
• testsuite/tests/unlifted-datatypes/should_fail/UnlDataInvalidResKind1.stderr
• testsuite/tests/unlifted-datatypes/should_run/UnlGadt1.stderr
• testsuite/tests/unlifted-datatypes/should_run/all.T
• testsuite/tests/unsatisfiable/T14339_Unsat.stderr
• testsuite/tests/unsatisfiable/T23816.stderr
• testsuite/tests/unsatisfiable/UnsatDefer.stderr
• testsuite/tests/vdq-rta/should_compile/T22326_th_pprint1.stderr
• testsuite/tests/vdq-rta/should_compile/T23739_th_pprint1.stderr
• + testsuite/tests/vdq-rta/should_fail/T23738_fail_pun.hs
• + testsuite/tests/vdq-rta/should_fail/T23738_fail_pun.stderr
• testsuite/tests/vdq-rta/should_fail/all.T
• testsuite/tests/warnings/should_compile/DataToTagWarnings.hs
• testsuite/tests/warnings/should_compile/DerivingTypeable.stderr
• + testsuite/tests/warnings/should_compile/SpecMultipleTys.hs
• + testsuite/tests/warnings/should_compile/SpecMultipleTys.stderr
• testsuite/tests/warnings/should_compile/T14794a.hs
• testsuite/tests/warnings/should_compile/T14794a.stderr
• testsuite/tests/warnings/should_compile/T14794b.hs
• testsuite/tests/warnings/should_compile/T14794b.stderr
• testsuite/tests/warnings/should_compile/T14794c.hs
• testsuite/tests/warnings/should_compile/T14794c.stderr
• testsuite/tests/warnings/should_compile/T14794d.hs
• testsuite/tests/warnings/should_compile/T14794d.stderr
• testsuite/tests/warnings/should_compile/T14794e.hs
• testsuite/tests/warnings/should_compile/T14794e.stderr
• testsuite/tests/warnings/should_compile/T14794f.hs
• testsuite/tests/warnings/should_compile/T14794f.stderr
• testsuite/tests/warnings/should_compile/T15460.stderr-ws-32
• testsuite/tests/warnings/should_compile/T15460.stderr-ws-64
• testsuite/tests/warnings/should_compile/T19296.stderr
• testsuite/tests/warnings/should_compile/T24396.stderr
• testsuite/tests/warnings/should_compile/WarnNoncanonical.stderr
• testsuite/tests/warnings/should_compile/all.T
• + testsuite/tests/warnings/should_fail/SpecEMultipleTys.hs
• + testsuite/tests/warnings/should_fail/SpecEMultipleTys.stderr
• testsuite/tests/warnings/should_fail/all.T
• testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs
• testsuite/tests/wasm/should_run/control-flow/README.md
• testsuite/tests/wasm/should_run/control-flow/WasmControlFlow.hs
• − testsuite/tests/wasm/should_run/control-flow/WasmControlFlow.stdout
• testsuite/tests/wasm/should_run/control-flow/all.T
• testsuite/tests/wcompat-warnings/Template.hs
• testsuite/tests/wcompat-warnings/WCompatWarningsOn.stderr
• utils/check-exact/ExactPrint.hs
• − utils/check-exact/Lookup.hs
• utils/check-exact/Main.hs
• utils/check-exact/Parsers.hs
• utils/check-exact/Transform.hs
• utils/check-exact/Types.hs
• utils/check-exact/Utils.hs
• utils/check-exact/check-exact.cabal
• utils/check-ppr/Main.hs
• utils/count-deps/Main.hs
• − utils/deriveConstants/Makefile
• utils/dump-decls/Main.hs
• utils/genprimopcode/Main.hs
• − utils/genprimopcode/Makefile
• utils/genprimopcode/Syntax.hs
• − utils/ghc-pkg/Makefile
• − utils/ghc-pkg/ghc-pkg.wrapper
• utils/ghc-toolchain/exe/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/ParseTriple.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cc.hs
• utils/haddock/doc/conf.py
• utils/haddock/haddock-api/haddock-api.cabal
• utils/haddock/haddock-api/resources/html/Linuwial.std-theme/linuwial.css
• utils/haddock/haddock-api/src/Haddock.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/DocMarkup.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Layout.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Names.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Convert.hs
• utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
• utils/haddock/haddock-api/src/Haddock/Interface.hs
• utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
• utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/haddock-library/haddock-library.cabal
• utils/haddock/haddock-library/src/Documentation/Haddock/Parser.hs
• utils/haddock/haddock-library/test/Documentation/Haddock/Parser/UtilSpec.hs
• utils/haddock/haddock-library/test/Documentation/Haddock/ParserSpec.hs
• utils/haddock/haddock-test/haddock-test.cabal
• utils/haddock/haddock-test/src/Test/Haddock.hs
• utils/haddock/haddock-test/src/Test/Haddock/Config.hs
• utils/haddock/haddock-test/src/Test/Haddock/Xhtml.hs
• utils/haddock/haddock.cabal
• − utils/haddock/haddock.wrapper
• utils/haddock/html-test/Main.hs
• utils/haddock/html-test/ref/Bug1004.html
• utils/haddock/html-test/ref/Bug548.html
• utils/haddock/html-test/ref/Bug923.html
• utils/haddock/html-test/ref/Bug973.html
• utils/haddock/html-test/ref/BundledPatterns2.html
• utils/haddock/html-test/ref/Hash.html
• utils/haddock/html-test/ref/ImplicitParams.html
• utils/haddock/html-test/ref/Instances.html
• utils/haddock/html-test/ref/LinearTypes.html
• utils/haddock/html-test/ref/PatternSyns.html
• utils/haddock/html-test/ref/TypeOperators.html
• utils/haddock/html-test/src/LinearTypes.hs
• utils/haddock/html-test/src/TypeOperators.hs
• utils/haddock/latex-test/ref/ConstructorArgs/ConstructorArgs.tex
• utils/haddock/latex-test/ref/DefaultSignatures/DefaultSignatures.tex
• utils/haddock/latex-test/ref/GadtConstructorArgs/GadtConstructorArgs.tex
• utils/haddock/latex-test/ref/LinearTypes/LinearTypes.tex
• utils/haddock/latex-test/ref/TypeFamilies3/TypeFamilies3.tex
• utils/haddock/latex-test/src/LinearTypes/LinearTypes.hs
• − utils/hp2ps/Makefile
• utils/hp2ps/Utilities.c
• − utils/hp2ps/hp2ps.wrapper
• utils/hsc2hs
• − utils/iserv/Makefile
• utils/iserv/cbits/iservmain.c
• + utils/jsffi/dyld.mjs
• utils/jsffi/post-link.mjs
• utils/jsffi/prelude.js → utils/jsffi/prelude.mjs
• utils/llvm-targets/gen-data-layout.sh
• − utils/remote-iserv/Makefile
• − utils/runghc/Makefile
• − utils/runghc/runghc.wrapper
• − utils/unlit/Makefile

The diff was not included because it is too large.