Hannes Siebenhandl pushed to branch wip/fendor/full-eventlog-live at Glasgow Haskell Compiler / GHC

Commits:

• 48a3ed57
  by Simon Peyton Jones at 2025-11-25T15:33:54+00:00

  Add a fast-path for args=[] to occAnalApp
  
  In the common case of having not arguments, occAnalApp
  was doing redundant work.
  

• 951e5ed9
  by Simon Peyton Jones at 2025-11-25T15:33:54+00:00

  Fix a performance hole in the occurrence analyser
  
  As #26425 showed, the clever stuff in
  
     Note [Occurrence analysis for join points]
  
  does a lot of duplication of usage details.  This patch
  improved matters with a little fancy footwork.  It is
  described in the new (W4) of the same Note.
  
  Compile-time allocations go down slightly. Here are the changes
  of +/- 0.5% or more:
  
      T13253(normal)    329,369,244    326,395,544  -0.9%
  T13253-spj(normal)     66,410,496     66,095,864  -0.5%
      T15630(normal)    129,797,200    128,663,136  -0.9%
     T15630a(normal)    129,212,408    128,027,560  -0.9%
      T16577(normal)  6,756,706,896  6,723,028,512  -0.5%
      T18282(normal)    128,462,070    125,808,584  -2.1% GOOD
     T18698a(normal)    208,418,305    202,037,336  -3.1% GOOD
      T18730(optasm)    136,981,756    136,208,136  -0.6%
      T18923(normal)     58,103,088     57,745,840  -0.6%
      T19695(normal)  1,386,306,272  1,365,609,416  -1.5%
      T26425(normal)  3,344,402,957  2,457,811,664 -26.5% GOOD
       T6048(optasm)     79,763,816     79,212,760  -0.7%
       T9020(optasm)    225,278,408    223,682,440  -0.7%
       T9961(normal)    303,810,717    300,729,168  -1.0% GOOD
  
           geo. mean                                -0.5%
           minimum                                 -26.5%
           maximum                                  +0.4%
  
  Metric Decrease:
      T18282
      T18698a
      T26425
      T9961
  

• f1959dfc
  by Simon Peyton Jones at 2025-11-26T11:58:07+00:00

  Remove a quadratic-cost assertion check in mkCoreApp
  
  See the new Note [Assertion checking in mkCoreApp]
  

• 98fa0d36
  by Simon Hengel at 2025-11-27T17:54:57-05:00

  Fix typo in docs/users_guide/exts/type_families.rst
  

• 5b97e5ce
  by Simon Hengel at 2025-11-27T17:55:37-05:00

  Fix broken RankNTypes example in user's guide
  

• fa2aaa00
  by Simon Peyton Jones at 2025-11-27T17:56:18-05:00

  Switch off specialisation in ExactPrint
  
  In !15057 (where we re-introduced -fpolymoprhic-specialisation) we found
  that ExactPrint's compile time blew up by a factor of 5.  It turned out
  to be caused by bazillions of specialisations of `markAnnotated`.
  
  Since ExactPrint isn't perf-critical, it does not seem worth taking
  the performance hit, so this patch switches off specialisation in
  this one module.
  

• 1fd25987
  by Simon Peyton Jones at 2025-11-27T17:56:18-05:00

  Switch -fpolymorphic-specialisation on by default
  
  This patch addresses #23559.
  
  Now that !10479 has landed and #26329 is fixed, we can switch on
  polymorphic specialisation by default, addressing a bunch of other
  tickets listed in #23559.
  
  Metric changes:
    * CoOpt_Singleton: +4% compiler allocations: we just get more
      specialisations
  
    * info_table_map_perf: -20% decrease in compiler allocations.
      This is caused by using -fno-specialise in ExactPrint.hs
      Without that change we get a 4x blow-up in compile time;
      see !15058 for details
  
  Metric Decrease:
      info_table_map_perf
  Metric Increase:
      CoOpt_Singletons
  

• b7fe7445
  by Matthew Pickering at 2025-11-27T17:56:59-05:00

  rts: Fix a deadlock with eventlog flush interval and RTS shutdown
  
  The ghc_ticker thread attempts to flush at the eventlog tick interval, this requires
  waiting to take all capabilities.
  
  At the same time, the main thread is shutting down, the schedule is
  stopped and then we wait for the ticker thread to finish.
  
  Therefore we are deadlocked.
  
  The solution is to use `newBoundTask/exitMyTask`, so that flushing can
  cooperate with the scheduler shutdown.
  
  Fixes #26573
  

• 1d4a1229
  by sheaf at 2025-11-27T17:58:02-05:00

  SimpleOpt: don't subst in pushCoercionIntoLambda
  
  It was noticed in #26589 that the change in 15b311be was incorrect:
  the simple optimiser carries two different substitution-like pieces of
  information: 'soe_subst' (from InVar to OutExpr) and 'soe_inl'
  (from InId to InExpr). It is thus incorrect to have 'pushCoercionIntoLambda'
  apply the substitution from 'soe_subst' while discarding 'soe_inl'
  entirely, which is what was done in 15b311be.
  
  Instead, we change back pushCoercionIntoLambda to take an InScopeSet,
  and optimise the lambda before calling 'pushCoercionIntoLambda' to avoid
  mixing InExpr with OutExpr, or mixing two InExpr with different
  environments. We can then call 'soeZapSubst' without problems.
  
  Fixes #26588 #26589
  

• 84a087d5
  by Sylvain Henry at 2025-11-28T17:35:28-05:00

  Fix PIC jump tables on Windows (#24016)
  
  Avoid overflows in jump tables by using a base label closer to the jump
  targets. See added Note [Jump tables]
  

• 82db7042
  by Zubin Duggal at 2025-11-28T17:36:10-05:00

  rts/linker/PEi386: Copy strings before they are inserted into LoadedDllCache. The original strings are temporary and might be freed at an arbitrary point.
  
  Fixes #26613
  

• ff3f0d09
  by Ben Gamari at 2025-11-29T18:34:28-05:00

  gitlab-ci: Run ghcup-metadata jobs on OpenCape runners
  
  This significantly reduces our egress traffic
  and makes the jobs significantly faster.

• ef0dc33b
  by Matthew Pickering at 2025-11-29T18:35:10-05:00

  Use 'OsPath' in getModificationTimeIfExists
  
  This part of the compiler is quite hot during recompilation checking in
  particular since the filepaths will be translated to a string. It is
  better to use the 'OsPath' native function, which turns out to be easy
  to do.
  

• fa3bd0a6
  by Georgios Karachalias at 2025-11-29T18:36:05-05:00

  Use OsPath in PkgDbRef and UnitDatabase, not FilePath
  

• 0d7c05ec
  by Ben Gamari at 2025-12-01T03:13:46-05:00

  hadrian: Place user options after package arguments
  
  This makes it easier for the user to override the default package
  arguments with `UserSettings.hs`.
  
  Fixes #25821.
  
  -------------------------
  Metric Decrease:
      T14697
  -------------------------
  

• 3b2c4598
  by Vladislav Zavialov at 2025-12-01T03:14:29-05:00

  Namespace-specified wildcards in import/export lists (#25901)
  
  This change adds support for top-level namespace-specified wildcards
  `type ..` and `data ..` to import and export lists.
  
  Examples:
    import M (type ..) -- imports all type and class constructors from M
    import M (data ..) -- imports all data constructors and terms from M
    module M (type .., f) where
      -- exports all type and class constructors defined in M,
      -- plus the function 'f'
  
  The primary intended usage of this feature is in combination with module
  aliases, allowing namespace disambiguation:
    import Data.Proxy as T (type ..)  -- T.Proxy is unambiguously the type constructor
    import Data.Proxy as D (data ..)  -- D.Proxy is unambiguously the data constructor
  
  The patch accounts for the interactions of wildcards with:
  * Imports with `hiding` clauses
  * Import warnings -Wunused-imports, -Wdodgy-imports
  * Export warnings -Wduplicate-exports, -Wdodgy-exports
  
  Summary of the changes:
  
  1. Move the NamespaceSpecifier type from GHC.Hs.Binds to GHC.Hs.Basic,
     making it possible to use it in more places in the AST.
  
  2. Extend the AST (type: IE) with a representation of `..`, `type ..`,
     and `data ..` (constructor: IEWholeNamespace). Per the proposal, the
     plain `..` is always rejected with a dedicated error message.
  
  3. Extend the grammar in Parser.y with productions for `..`, `type ..`,
     and `data ..` in both import and export lists.
  
  4. Implement wildcard imports by updating the `filterImports` function
     in GHC.Rename.Names; the logic for IEWholeNamespace is roughly
     modeled after the Nothing (no explicit import list) case.
  
  5. Implement wildcard exports by updating the `exports_from_avail`
     function in GHC.Tc.Gen.Export; the logic for IEWholeNamespace is
     closely modeled after the IEModuleContents case.
  
  6. Refactor and extend diagnostics to report the new warnings and
     errors. See PsErrPlainWildcardImport, DodgyImportsWildcard,
                 PsErrPlainWildcardExport, DodgyExportsWildcard,
                 TcRnDupeWildcardExport.
  
  Note that this patch is specifically about top-level import/export
  items. Subordinate import/export items are left unchanged.
  

• c71faa76
  by Luite Stegeman at 2025-12-01T03:16:05-05:00

  rts: Handle overflow of ELF section header string table
  
  If the section header string table is stored in a section greater
  than or equal to SHN_LORESERVE (0xff00), the 16-bit field e_shstrndx
  in the ELF header does not contain the section number, but rather
  an overflow value SHN_XINDEX (0xffff) indicating that we need to look
  elsewhere.
  
  This fixes the linker by not using e_shstrndx directly but calling
  elf_shstrndx, which correctly handles the SHN_XINDEX value.
  
  Fixes #26603
  

• ab20eb54
  by Mike Pilgrem at 2025-12-01T22:46:55+00:00

  Re CLC issue 292 Warn GHC.Internal.List.{init,last} are partial
  
  Also corrects the warning for `tail` to refer to `Data.List.uncons` (like the existing warning for `head`).
  
  In module `Settings.Warnings`, applies `-Wno-x-partial` to the `filepath`, and `parsec` packages (outside GHC's repository).
  
  Also bumps submodules.
  

• fc1d7f79
  by Jade Lovelace at 2025-12-02T11:04:09-05:00

  docs: fix StandaloneKindSignatures in DataKinds docs
  
  These should be `type` as otherwise GHC reports a duplicate definition
  error.
  

• beae879b
  by Rodrigo Mesquita at 2025-12-03T15:42:37+01:00

  task: Substitute some datatypes for newtypes
  
  * Substitutes some data type declarations for newtype declarations
  * Adds comment to `LlvmConfigCache`, which must decidedly not be a
    newtype.
  
  Fixes #23555
  

• 3bd7dd44
  by mangoiv at 2025-12-04T04:36:45-05:00

  Renamer: reinstate the template haskell level check in notFound
  
  Out-of-scope names might be caused by a staging error, as is explained by
  Note [Out of scope might be a staging error] in GHC.Tc.Utils.Env.hs.
  This logic was assumed to be dead code after 217caad1 and has thus been
  removed. This commit reintroduces it and thus fixes issue #26099.
  

• 0318010b
  by Zubin Duggal at 2025-12-04T04:37:27-05:00

  testlib: Optionally include the way name in the expected output file
  
  This allows us to have different outputs for different ways.
  

• 6d945fdd
  by Zubin Duggal at 2025-12-04T04:37:27-05:00

  testsuite: Accept output of tests failing in ext-interp way due to differing compilation requirements
  
  Fixes #26552
  

• 0ffc5243
  by Cheng Shao at 2025-12-04T04:38:09-05:00

  devx: minor fixes for compile_flags.txt
  
  This patch includes minor fixes for compile_flags.txt to improve
  developer experience when using clangd as language server to hack on
  RTS C sources:
  
  - Ensure `-fPIC` is passed and `__PIC__` is defined, to be coherent
    with `-DDYNAMIC` and ensure the `__PIC__` guarded code paths are
    indexed
  - Add the missing `-DRtsWay` definition, otherwise a few source files
    like `RtsUtils.c` and `Trace.c` would produce clangd errors
  

• e36a5fcb
  by Matthew Pickering at 2025-12-05T16:25:57-05:00

  Add support for building bytecode libraries
  
  A bytecode library is a collection of bytecode files (.gbc) and a
  library which combines together additional object files.
  
  A bytecode library is created by invoking GHC with the `-bytecodelib`
  flag.
  
  A library can be created from in-memory `ModuleByteCode` linkables or
  by passing `.gbc` files as arguments on the command line.
  
  Fixes #26298
  

• 8f9ae339
  by Matthew Pickering at 2025-12-05T16:25:57-05:00

  Load bytecode libraries to satisfy package dependencies
  
  This commit allows you to use a bytecode library to satisfy a package
  dependency when using the interpreter.
  
  If a user enables `-fprefer-byte-code`, then if a package provides a
  bytecode library, that will be loaded and used to satisfy the
  dependency.
  
  The main change is to separate the relevant parts of the `LoaderState`
  into external and home package byte code. Bytecode is loaded into either
  the home package or external part (similar to HPT/EPS split), HPT
  bytecode can be unloaded. External bytecode is never unloaded.
  
  The unload function has also only been called with an empty list of
  "stable linkables" for a long time. It has been modified to directly
  implement a complete unloading of the home package bytecode linkables.
  
  At the moment, the bytecode libraries are found in the "library-dirs"
  field from the package description. In the future when `Cabal`
  implements support for "bytecode-library-dirs" field, we can read the
  bytecode libraries from there. No changes to the Cabal submodule are
  necessary at the moment.
  
  Four new tests are added in testsuite/tests/cabal, which generate fake
  package descriptions and test loading the libraries into GHCi.
  
  Fixes #26298
  

• 54458ce4
  by mangoiv at 2025-12-05T16:26:50-05:00

  ExplicitLevelImports: improve documentation of the code
  
  - more explicit names for variable names like `flg` or `topLevel`
  - don't pass the same value twice to functions
  - some explanations of interesting but undocumented code paths
  - adjust comment to not mention non-existent error message
  

• c7061392
  by mangoiv at 2025-12-05T16:27:42-05:00

  driver: don't expect nodes to exist when checking paths between them
  
  In `mgQueryZero`, previously node lookups were expected to never fail,
  i.e. it was expected that when calculating the path between two nodes in
  a zero level import graph, both nodes would always exist. This is not
  the case, e.g. in some situations involving exact names (see the
  test-case). The fix is to first check whether the node is present in the
  graph at all, instead of panicking, just to report that there is no
  path.
  
  Closes #26568
  

• d6cf8463
  by Peng Fan at 2025-12-06T11:06:28-05:00

  NCG/LA64: Simplify genCCall into two parts
  
  genCCall is too long, so it's been simplified into two parts:
  genPrim and genLibCCall.
  
  Suggested by Andreas Klebinger
  

• 9d371d23
  by Matthew Pickering at 2025-12-06T11:07:09-05:00

  hadrian: Use a response file to invoke GHC for dep gathering.
  
  In some cases we construct an argument list too long for GHC to
  handle directly on windows. This happens when we generate
  the dependency file because the command line will contain
  references to a large number of .hs files.
  
  To avoid this we now invoke GHC using a response file when
  generating dependencies to sidestep length limitations.
  
  Note that we only pass the actual file names in the dependency
  file. Why? Because this side-steps #26560
  

• 0043bfb0
  by Marc Scholten at 2025-12-06T11:08:03-05:00

  update xhtml to 3000.4.0.0
  
  haddock-api: bump xhtml bounds
  
  haddock-api: use lazy text instead of string to support xhtml 3000.4.0.0
  
  Bumping submodule xhtml to 3000.4.0.0
  
  add xhtml to stage0Packages
  
  remove unused import of writeUtf8File
  
  Remove redundant import
  
  Update haddock golden files for xhtml 3000.4.0.0
  
  Metric Decrease:
      haddock.Cabal
      haddock.base
  

• fc958fc9
  by Julian Ospald at 2025-12-06T11:08:53-05:00

  rts: Fix object file format detection in loadArchive
  
  Commit 76d1041dfa4b96108cfdd22b07f2b3feb424dcbe seems to
  have introduced this bug, ultimately leading to failure of
  test T11788. I can only theorize that this test isn't run
  in upstream's CI, because they don't build a static GHC.
  
  The culprit is that we go through the thin archive, trying
  to follow the members on the filesystem, but don't
  re-identify the new object format of the member. This pins
  `object_fmt` to `NotObject` from the thin archive.
  
  Thanks to @angerman for spotting this.
  

• 0f297f6e
  by mangoiv at 2025-12-06T11:09:44-05:00

  users' guide: don't use f strings in the python script to ensure compatibility with python 3.5
  

• 3bfe7aa2
  by Matthew Pickering at 2025-12-07T12:18:57-05:00

  ci: Try using multi repl in ghc-in-ghci test
  
  This should be quite a bit faster than the ./hadrian/ghci command as it
  doesn't properly build all the dependencies.
  

• 2ef1601a
  by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00

  Stack.Decode: Don't error on bitmap size 0
  
  A RET_BCO may have a bitmap with no payload.
  In that case, the bitmap = 0.
  
  One can observe this by using -ddump-bcos and interpreting
  
  ```
  main = pure ()
  ```
  
  Observe, for instance, that the BCO for this main function has size 0:
  
  ```
  ProtoBCO Main.main#0:
     \u []
         break<main:Main,0>() GHC.Internal.Base.pure
                                  GHC.Internal.Base.$fApplicativeIO GHC.Internal.Tuple.()
     bitmap:  0 []
     BRK_FUN <breakarray> main:Main 0 <cc>
     PACK     () 0
     PUSH_G   GHC.Internal.Base.$fApplicativeIO
     PUSH_APPLY_PP
     PUSH_G   GHC.Internal.Base.pure
     ENTER
  ```
  
  Perhaps we never tried to decode a stack in which a BCO like this was
  present. However, for the debugger, we want to decode stacks of threads
  stopped at breakpoints, and these kind of BCOs do get on a stack under
  e.g. `stg_apply_interp_info` frames.
  
  See the accompanying test in the next commit for an example to trigger
  the bug this commit fixes.
  
  Fixes #26640
  

• 747153d2
  by Rodrigo Mesquita at 2025-12-07T12:19:38-05:00

  Add test for #26640
  

• d4b1e353
  by Simon Hengel at 2025-12-10T00:00:02-05:00

  Fix syntax error in gadt_syntax.rst

• 91cc8be6
  by Cheng Shao at 2025-12-10T00:00:43-05:00

  ci: fix "ci.sh clean" to address frequent out of space error on windows runners
  
  This patch fixes the `ci.sh clean` logic to address frequent out of
  space error on windows runners; previously it didn't clean up the
  inplace mingw blobs, which is the largest source of space leak on
  windows runners. See added comment for detailed explanation.
  

• fe2b79f4
  by Recursion Ninja at 2025-12-10T08:34:18-05:00

  Narrow before optimising MUL/DIV/REM into shifts
  
  The MUL/DIV/REM operations can be optimised into shifts when one of the
  operands is a constant power of 2. However, as literals in Cmm are
  stored as 'Integer', for this to be correct we first need to narrow the
  literal to the appropriate width before checking whether the literal is
  a power of 2.
  
  Fixes #25664
  

• 06c2349c
  by Recursion Ninja at 2025-12-10T08:34:58-05:00

  Decouple 'Language.Haskell.Syntax.Type' from 'GHC.Utils.Panic'
  
    - Remove the *original* defintion of 'hsQTvExplicit' defined within 'Language.Haskell.Syntax.Type'
  
    - Redefine 'hsQTvExplicit' as 'hsq_explicit' specialized to 'GhcPass' exported by 'GHC.Utils.Panic'
  
    - Define 'hsQTvExplicitBinders' as 'hsq_explicit' specialized to 'DocNameI' exported by 'Haddock.GhcUtils'.
  
    - Replace all call sites of the original 'hsQTvExplicit' definition with either:
      1. 'hsQTvExplicit' updated definition
      2. 'hsQTvExplicitBinders'
  
  All call sites never entered the 'XLHsQTyVars' constructor branch, but a call to 'panic' existed on this code path because the type system was not strong enought to guarantee that the 'XLHsQTyVars' construction was impossible.
  These two specialized functions provide the type system with enough information to make that guarantee, and hence the dependancy on 'panic' can be removed.
  

• ac0815d5
  by sheaf at 2025-12-10T23:39:57-05:00

  Quantify arg before mult in function arrows
  
  As noted in #23764, we expect quantification order to be left-to-right,
  so that in a type such as
  
    a %m -> b
  
  the inferred quantification order should be [a, m, b] and not [m, a, b].
  
  This was addressed in commit d31fbf6c, but that commit failed to update
  some other functions such as GHC.Core.TyCo.FVs.tyCoFVsOfType.
  
  This affects Haddock, as whether we print an explicit forall or not
  depends on whether the inferred quantification order matches the actual
  quantification order.
  

• 2caf796e
  by sheaf at 2025-12-10T23:39:57-05:00

  Haddock: improvements to ty-var quantification
  
  This commit makes several improvements to how Haddock deals with the
  quantification of type variables:
  
    1. In pattern synonyms, Haddock used to jumble up universal and
       existential quantification. That is now fixed, fixing #26252.
  
       Tested in the 'PatternSyns2' haddock-html test.
  
    2. The logic for computing whether to use an explicit kind annotation
       for a type variable quantified in a forall was not even wrong.
       This commit improves the heuristic, but it will always remain an
       imperfect heuristic (lest we actually run kind inference again).
       In the future (#26271), we hope to avoid reliance on this heuristic.
  

• b14bdd59
  by Teo Camarasu at 2025-12-10T23:40:38-05:00

  Add explicit export list to GHC.Num
  
  Let's make clear what this module exports to allow us to easily deprecate and remove some of these in the future. Resolves https://gitlab.haskell.org/ghc/ghc/-/issues/26625
  

• d99f8326
  by Cheng Shao at 2025-12-11T19:14:18-05:00

  compiler: remove unused CPP code in foreign stub
  
  This patch removes unused CPP code in the generated foreign stub:
  
  - `#define IN_STG_CODE 0` is not needed, since `Rts.h` already
    includes this definition
  - The `if defined(__cplusplus)` code paths are not needed in the `.c`
    file, since we don't generate C++ stubs and don't include C++
    headers in our stubs. But it still needs to be present in the `.h`
    header since it might be later included into C++ source files.
  

• 46c9746f
  by Cheng Shao at 2025-12-11T19:14:57-05:00

  configure: bump LlvmMaxVersion to 22
  
  This commit bumps LlvmMaxVersion to 22; 21.x releases have been
  available since Aug 26th, 2025 and there's no regressions with 21.x so
  far. This bump is also required for updating fedora image to 43.
  

• 96fce8d0
  by Cheng Shao at 2025-12-12T01:17:51+01:00

  hadrian: add support for building with UndefinedBehaviorSanitizer
  
  This patch adds a +ubsan flavour transformer to hadrian to build all
  stage1+ C/C++ code with UndefinedBehaviorSanitizer. This is
  particularly useful to catch potential undefined behavior in the RTS
  codebase.
  

• f7a06d8c
  by Cheng Shao at 2025-12-12T01:17:51+01:00

  ci: update alpine/fedora & add ubsan job
  
  This patch updates alpine image to 3.23, fedora image to 43, and adds
  a `x86_64-linux-fedora43-validate+debug_info+ubsan` job that's run in
  validate/nightly pipelines to catch undefined behavior in the RTS
  codebase.
  

• 2ccd11ca
  by Cheng Shao at 2025-12-12T01:17:51+01:00

  rts: fix zero-length VLA undefined behavior in interpretBCO
  
  This commit fixes a zero-length VLA undefined behavior in interpretBCO, caught by UBSan:
  
  ```
  +rts/Interpreter.c:3133:19: runtime variable length array bound evaluates to non-positive value 0
  ```
  

• 4156ed19
  by Cheng Shao at 2025-12-12T01:17:51+01:00

  rts: fix unaligned ReadSpB in interpretBCO
  
  This commit fixes unaligned ReadSpB in interpretBCO, caught by UBSan:
  
  ```
  +rts/Interpreter.c:2174:64: runtime load of misaligned address 0x004202059dd1 for type 'StgWord', which requires 8 byte alignment
  ```
  
  To perform proper unaligned read, we define StgUnalignedWord as a type
  alias of StgWord with aligned(1) attribute, and load StgUnalignedWord
  instead of StgWord in ReadSpB, so the C compiler is aware that we're
  not loading with natural alignment.
  

• fef89fb9
  by Cheng Shao at 2025-12-12T01:17:51+01:00

  rts: fix signed integer overflow in subword arithmetic in interpretBCO
  
  This commit fixes signed integer overflow in subword arithmetic in
  interpretBCO, see added note for detailed explanation.
  

• 3c001377
  by Cheng Shao at 2025-12-13T05:03:15-05:00

  ci: use treeless fetch for perf notes
  
  This patch improves the ci logic for fetching perf notes by using
  treeless fetch
  (https://github.blog/open-source/git/get-up-to-speed-with-partial-clone-and-shallow-clone),
  to avoid downloading all blobs of the perf notes repo at once, and
  only fetch the actually required blobs on-demand when needed. This
  makes the initial `test-metrics.sh pull` operation much faster, and
  also more robust, since we are seeing an increasing rate of 504 errors
  in CI when fetching all perf notes at once, which is a major source of
  CI flakiness at this point.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 123a8d77
  by Peter Trommler at 2025-12-13T05:03:57-05:00

  Cmm: remove restriction in MachOp folding
  

• 0b54b5fd
  by Andreas Klebinger at 2025-12-13T05:04:38-05:00

  Remove explicit Typeable deriviations.
  

• 08b13f7b
  by Cheng Shao at 2025-12-13T05:05:18-05:00

  ci: set gc.auto=0 during setup stage
  
  This patch sets `gc.auto=0` during `setup` stage of CI, see added
  comment for detailed explanation.
  

• 3b5aecb5
  by Ben Gamari at 2025-12-13T23:43:10+01:00

  Bump exceptions submodule to 0.10.11
  

• c32de3b0
  by Johan Förberg at 2025-12-15T02:36:03-05:00

  base: Define Semigroup and Monoid instances for lazy ST
  
  CLC proposal:
  https://github.com/haskell/core-libraries-committee/issues/374
  
  Fixes #26581
  

• 4f8b660c
  by mangoiv at 2025-12-15T02:37:05-05:00

  ci: do not require nightly cabal-reinstall job to succeed
  

• 2c2a3ef3
  by Cheng Shao at 2025-12-15T11:51:53-05:00

  docs: drop obsolete warning about -fexternal-interpreter on windows
  
  This patch drops an obsolete warning about -fexternal-interpreter not
  supported on windows; it is supported since a long time ago, including
  the profiled way.
  

• 68573aa5
  by Marc Scholten at 2025-12-15T11:53:00-05:00

  haddock: Drop Haddock.Backends.HaddockDB as it's unused
  

• b230d549
  by mangoiv at 2025-12-16T15:17:45-05:00

  base: generalize delete{Firsts,}By
  
  When we delete{Firsts,}By we should not require the
  lists to be  the same type. This is an especially useful
  generalisation in the case of deleteFirstsBy because we
  can skip an invocation of the map function.
  
  This change was discussed on the core-libraries-committee's bug
  tracker at https://github.com/haskell/core-libraries-committee/issues/372.
  

• 6a2b43e3
  by Cheng Shao at 2025-12-16T15:18:30-05:00

  compiler: clean up redundant LANGUAGE pragmas
  
  This patch bumps `default-language` of `ghc`/`ghc-bin` from `GHC2021`
  to `GHC2024` (which is supported in ghc 9.10, current boot ghc lower
  version bound), and also cleans up redundant `LANGUAGE` pragmas (as
  well as `default-extensions`/`other-extensions`) that are already
  implied by `GHC2024`.
  
  Co-authored-by: Codex <codex@openai.com>
  

• fca9cd7c
  by sheaf at 2025-12-18T13:18:18-05:00

  X86 CodeGen: fix assign_eax_sse_regs
  
  We must set %al to the number of SSE2 registers that contain arguments
  (in case we are dealing with a varargs function). The logic for counting
  how many arguments reside in SSE2 registers was incorrect, as it used
  'isFloatFormat', which incorrectly ignores vector registers.
  
  We now instead do case analysis on the register class:
  
    is_sse_reg r =
      case targetClassOfReg platform r of
        RcFloatOrVector -> True
        RcInteger       -> False
  
  This change is necessary to prevent segfaults in T20030_test1j, because
  subsequent commits change the format calculations, resulting in vector
  formats more often.
  

• 53150617
  by sheaf at 2025-12-18T13:18:19-05:00

  X86 regUsageOfInstr: fix format for IMUL
  
  When used with 8-bit operands, the IMUL instruction returns the result
  in the lower 16 bits of %rax (also known as %ax). This is different
  than for the other sizes, where an input at 16, 32 or 64 bits will
  result in 16, 32 or 64 bits of output in both %rax and %rdx.
  
  This doesn't affect the behaviour of the compiler, because we don't
  allow partial writes at sub-word sizes. The rationale is explained
  in Wrinkle [Don't allow scalar partial writes] in Note [Register formats in liveness analysis],
  in GHC.CmmToAsm.Reg.Liveness.
  

• c7a56dd1
  by sheaf at 2025-12-18T13:18:19-05:00

  Liveness analysis: consider register formats
  
  This commit updates the register allocator to be a bit more careful in
  situations in which a single register is used at multiple different
  formats, e.g. when xmm1 is used both to store a Double# and a DoubleX2#.
  
  This is done by introducing the 'Regs' newtype around 'UniqSet RegWithFormat',
  for which the combining operations take the larger of the two formats
  instead of overriding the format.
  
  Operations on 'Regs' are defined in 'GHC.CmmToAsm.Reg.Regs'. There is
  a modest compile-time cost for the additional overhead for tracking
  register formats, which causes the metric increases of this commit.
  
  The subtle aspects of the implementation are outlined in
  Note [Register formats in liveness analysis] in GHC.CmmToAsm.Reg.Liveness.
  
  Fixes #26411 #26611
  
  -------------------------
  Metric Increase:
      T12707
      T26425
      T3294
  -------------------------
  

• c2e83339
  by sheaf at 2025-12-18T13:18:19-05:00

  Register allocator: reload at same format as spill
  
  This commit ensures that if we spill a register onto the stack at a
  given format, we then always reload the register at this same format.
  
  This ensures we don't end up in a situation where we spill F64x2 but end
  up only reloading the lower F64. This first reload would make us believe
  the whole data is in a register, thus silently losing the upper 64 bits
  of the spilled register's contents.
  
  Fixes #26526
  

• 55ab583b
  by sheaf at 2025-12-18T13:18:19-05:00

  Register allocation: writes redefine format
  
  As explained in Note [Allocated register formats] in GHC.CmmToAsm.Reg.Linear,
  we consider all writes to redefine the format of the register.
  
  This ensures that in a situation such as
  
    movsd .Ln6m(%rip),%v1
    shufpd $0,%v1,%v1
  
  we properly consider the broadcast operation to change the format of %v1
  from F64 to F64x2.
  
  This completes the fix to #26411 (test in T26411b).
  

• 951402ed
  by Vladislav Zavialov at 2025-12-18T13:19:05-05:00

  Parser: improve mkModuleImpExp, remove checkImportSpec
  
  1. The `mkModuleImpExp` helper now knows whether it is processing an import or
     export list item, and uses this information to produce a more accurate error
     message for `import M (T(..,x))` with PatternSynonyms disabled.
     The old message incorrectly referred to this case as an export form.
  
  2. The `checkImportSpec` helper is removed in favor of more comprehensive error
     checking in `mkModuleImpExp`.
  
  3. Additionaly, the invariants of `ImpExpList` and `ImpExpAllWith` have been
     made more explicit in the comments and assertions (calls to 'panic').
  
  Test case: import-syntax-no-ext
  

• 47d83d96
  by Vladislav Zavialov at 2025-12-18T13:19:06-05:00

  Subordinate namespace-specified wildcards (#25901)
  
  Add support for subordinate namespace-specified wildcards
  `X(type ..)` and `X(data ..)` to import and export lists.
  
  Examples:
    import M (Cls(type ..))  -- imports Cls and all its associated types
    import M (Cls(data ..))  -- imports Cls and all its methods
    module M (R(data ..), C(type ..)) where
      -- exports R and all its data constructors and record fields;
      -- exports C and all its associated types, but not its methods
  
  The scope of this change is limited to the case where the wildcard is the only
  subordinate import/export item, whereas the more complex forms `X(type .., f)`
  or `X(type .., data ..)` are unsupported and raise the newly introduced
  PsErrUnsupportedExplicitNamespace error. This restriction may be lifted later.
  
  Summary of the changes:
  
  1. Refactor IEThingAll to store its extension field XIEThingAll as a record
     IEThingAllExt instead of a tuple.
  
  2. Extend the AST by adding a NamespaceSpecifier field to IEThingAllExt,
     representing an optional namespace specifier `type` or `data` in front
     of a subordinate wildcard `X(..)`.
  
  3. Extend the grammar in Parser.y with productions for `type ..` and `data ..`
     in subordinate import/export items.
  
  4. Introduce `filterByNamespaceGREs` to filter [GlobalRdrElt] by a
     NamespaceSpecifier; use it in `filterImports` and `exports_from_avail`
     to account for the namespace specifier in IEThingAll.
  
  5. Improve diagnostics by storing more information in DodgyImportsEmptyParent
     and DodgyExportsEmptyParent.
  
  Test cases:
    T25901_sub_e   T25901_sub_f   T25901_sub_g   T25901_sub_a
    T25901_sub_b   T25901_sub_c   T25901_sub_d   T25901_sub_w
    DodgyImports02 DodgyImports03 DodgyImports04
  

• eac418bb
  by Recursion Ninja at 2025-12-18T13:19:48-05:00

  Removing the 'Data' instance for 'InstEnv'.
  
  The 'Data' instance is blocking work on Trees that Grow, and the
  'Data' instance seem to have been added without a clear purpose.
  

• e920e038
  by Recursion Ninja at 2025-12-18T13:19:48-05:00

  'Decouple Language.Haskell.Syntax.Decls' from 'GHC.Unit.Module.Warnings'
  

• bd38b76c
  by Cheng Shao at 2025-12-18T13:20:31-05:00

  testsuite: improve coverage of foundation test
  
  This patch refactors the `foundation` test a bit to improve coverage:
  
  - Instead of using a hard-coded seed, a random seed is now taken from
    the command line, and printed upon test failure. This improves test
    coverage over many future CI runs, and shall a failure occur, the
    seed is available in the CI log for local reproduction.
  - The iterations count is bumped to 1000 instead of 100, similar to
    the bump in `test-primops`. Runtime timeout is bumped 2x just to be
    safe.
  - Improve `newLCGGen` by using non-atomic loads/stores on a
    `MutableByteArray#` for storing mutable `Word64`, this test doesn't
    use parallelism in the first place
  - Fixed a few compiler warnings and removed redundant pragmas and
    imports
  
  Co-authored-by: Codex <codex@openai.com>
  

• 3995187c
  by Sylvain Henry at 2025-12-18T13:21:45-05:00

  Doc: document -pgmi "" (#26634)
  

• 5729418c
  by Cheng Shao at 2025-12-18T13:22:29-05:00

  rts: use __builtin_mul_overflow for hs_mulIntMayOflo
  
  This patch uses `__builtin_mul_overflow` to implement
  `hs_mulIntMayOflo`. This is a GNU C checked arithmetic builtin
  function supported by gcc/clang, is type-generic so works for both
  32-bit/64-bit, and makes the code both more efficient and easier to
  read/maintain than the previous hand rolled logic.
  

• 1ca4b49a
  by Cheng Shao at 2025-12-18T13:23:11-05:00

  compiler/rts: fix ABI mismatch in barf() invocations
  
  This patch fixes a long-standing issue of ABI mismatch in `barf()`
  invocations, both in compiler-emitted code and in hand written Cmm
  code:
  
  - In RTS, we have `barf()` which reports a fatal internal error
    message and exits the program.
  - `barf()` is a variadic C function! When used as a callee of a
    foreign call with `ccall` calling convention instead of `capi`,
    there is an ABI mismatch between the caller and the callee!
  - Unfortunately, both the compiler and the Cmm sources contain many
    places where we call `barf()` via `ccall` convention!! Like, when
    you write `foreign "C" barf("foo object (%p) entered!", R1)`, it
    totally doesn't do what you think it'll do at all!! The second
    argument `R1` is not properly passed in `va_list`, and the behavior
    is completely undefined!!
  - Even more unfortunately, this issue has been sitting around long
    enough because the ABI mismatch is subtle enough on normie platforms
    like x64 and arm64.
  - But there are platforms like wasm32 that are stricter about ABI, and
    the broken `barf()` invocations already causes trouble for wasm
    backend: we had to use ugly hacks like `barf(errmsg, NULL)` to make
    `wasm-ld` happy, and even with this band-aid, compiler-generated
    `barf()` invocations are still broken, resulting in regressions in
    certain debug-related functionality, e.g. `-dtag-inference-checks`
    is broken on wasm32 (#22882).
  
  This patch properly fixes the issue:
  
  - We add non-variadic `barf` wrappers in the RTS that can be used as
    `ccall` callees
  - Both the compiler `emitBarf` logic and the hand-written Cmm are
    changed to call these wrappers
  - `emitBarf` now also properly annotates the foreign call as
    `CmmNeverReturns` to indicate it's a noreturn call to enable more
    efficient code generation
  
  `-dtag-inference-checks` now works on wasm. Closes #22882.
  
  Co-authored-by: Codex <codex@openai.com>
  

• b3dd23b9
  by Vilim Lendvaj at 2025-12-18T13:23:57-05:00

  Remove outdated comment
  
  The Traversable instance for ZipList is no longer in
  GHC.Internal.Data.Traversable. In fact, it is right below this very comment.
  

• 9a9c2f03
  by Cheng Shao at 2025-12-18T13:24:39-05:00

  compiler: remove unused OtherSection logic
  
  This patch removes the OtherSection logic in Cmm, given it's never
  actually used by any of our backends.
  

• 91edd292
  by Wolfgang Jeltsch at 2025-12-19T03:18:19-05:00

  Remove unused known-key and name variables for generics
  
  This removes the known-key and corresponding name variables for `K1`,
  `M1`, `R`, `D`, `C`, `S`, and `URec` from `GHC.Generics`, as they are
  apparently nowhere used in GHC’s source code.
  

• 73ee7e38
  by Wolfgang Jeltsch at 2025-12-19T03:19:02-05:00

  Remove unused known keys and names for generics classes
  
  This removes the known-key and corresponding name variables for
  `Datatype`, `Constructor`, and `Selector` from `GHC.Generics`, as they
  are apparently nowhere used in GHC’s source code.
  

• f69c5f14
  by Cheng Shao at 2025-12-19T03:19:45-05:00

  wasm: fix handling of ByteArray#/MutableByteArray# arguments in JSFFI imports
  
  This patch fixes the handling of ByteArray#/MutableByteArray#
  arguments in JSFFI imports, see the amended note and manual for
  explanation. Also adds a test to witness the fix.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 224446a2
  by Cheng Shao at 2025-12-20T07:49:54-05:00

  rts: workaround -Werror=maybe-uninitialized false positives
  
  In some cases gcc might report -Werror=maybe-uninitialized that we
  know are false positives, but need to workaround it to make validate
  builds with -Werror pass.
  

• 251ec087
  by Cheng Shao at 2025-12-20T07:49:54-05:00

  hadrian: use -Og as C/C++ optimization level when debugging
  
  This commit enables -Og as optimization level when compiling the debug
  ways of rts. According to gcc documentation
  (https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-Og),
  -Og is a better choice than -O0 for producing debuggable code. It's
  also supported by clang as well, so it makes sense to use it as a
  default for debugging. Also add missing -g3 flag to C++ compilation
  flags in +debug_info flavour transformer.
  

• fb586c67
  by Cheng Shao at 2025-12-20T07:50:36-05:00

  compiler: replace DList with OrdList
  
  This patch removes `DList` logic from the compiler and replaces it
  with `OrdList` which also supports O(1) concatenation and should be
  more memory efficient than the church-encoded `DList`.
  

• 8149c987
  by Cheng Shao at 2025-12-20T17:06:51-05:00

  hadrian: add with_profiled_libs flavour transformer
  
  This patch adds a `with_profiled_libs` flavour transformer to hadrian
  which is the exact opposite of `no_profiled_libs`. It adds profiling
  ways to stage1+ rts/library ways, and doesn't alter other flavour
  settings. It is useful when needing to test profiling logic locally
  with a quick flavour.
  

• 746b18cd
  by Cheng Shao at 2025-12-20T17:06:51-05:00

  hadrian: fix missing profiled dynamic libraries in profiled_ghc
  
  This commit fixes the profiled_ghc flavour transformer to include
  profiled dynamic libraries as well, since they're supported by GHC
  since !12595.
  

• 4dd7e3b9
  by Cheng Shao at 2025-12-20T17:07:33-05:00

  ci: set http.postBuffer to mitigate perf notes timeout on some runners
  
  This patch sets http.postBuffer to mitigate the timeout when fetching
  perf notes on some runners with slow internet connection. Fixes #26684.
  

• bc36268a
  by Wolfgang Jeltsch at 2025-12-21T16:23:24-05:00

  Remove unused known keys and names for type representations
  
  This removes the known-key and corresponding name variables for
  `TrName`, `TrNameD`, `TypeRep`, `KindRepTypeLitD`, `TypeLitSort`, and
  `mkTrType`, as they are apparently nowhere used in GHC’s source code.
  

• ff5050e9
  by Wolfgang Jeltsch at 2025-12-21T16:24:04-05:00

  Remove unused known keys and names for natural operations
  
  This removes the known-key and corresponding name variables for
  `naturalAndNot`, `naturalLog2`, `naturalLogBaseWord`, `naturalLogBase`,
  `naturalPowMod`, `naturalSizeInBase`, `naturalToFloat`, and
  `naturalToDouble`, as they are apparently nowhere used in GHC’s source
  code.
  

• 424388c2
  by Wolfgang Jeltsch at 2025-12-21T16:24:45-05:00

  Remove the unused known key and name for `Fingerprint`
  
  This removes the variables for the known key and the name of the
  `Fingerprint` data constructor, as they are apparently nowhere used in
  GHC’s source code.
  

• a1ed86fe
  by Wolfgang Jeltsch at 2025-12-21T16:25:26-05:00

  Remove the unused known key and name for `failIO`
  
  This removes the variables for the known key and the name of the
  `failIO` operation, as they are apparently nowhere used in GHC’s source
  code.
  

• b8220daf
  by Wolfgang Jeltsch at 2025-12-21T16:26:07-05:00

  Remove the unused known key and name for `liftM`
  
  This removes the variables for the known key and the name of the `liftM`
  operation, as they are apparently nowhere used in GHC’s source code.
  

• eb0628b1
  by Wolfgang Jeltsch at 2025-12-21T16:26:47-05:00

  Fix the documentation of `hIsClosed`
  

• db1ce858
  by sheaf at 2025-12-22T17:11:17-05:00

  Do deep subsumption when computing valid hole fits
  
  This commit makes a couple of improvements to the code that
  computes "valid hole fits":
  
    1. It uses deep subsumption for data constructors.
       This matches up the multiplicities, as per
       Note [Typechecking data constructors].
       This fixes #26338 (test: LinearHoleFits).
  
    2. It now suggests (non-unidirectional) pattern synonyms as valid
       hole fits. This fixes #26339 (test: PatSynHoleFit).
  
    3. It uses 'stableNameCmp', to make the hole fit output deterministic.
  
  -------------------------
  Metric Increase:
      hard_hole_fits
  -------------------------
  

• 72ee9100
  by sheaf at 2025-12-22T17:11:17-05:00

  Speed up hole fits with a quick pre-test
  
  This speeds up the machinery for valid hole fits by doing a small
  check to rule out obviously wrong hole fits, such as:
  
    1. A hole fit identifier whose type has a different TyCon at the head,
       after looking through foralls and (=>) arrows, e.g.:
          hole_ty = Int
          cand_ty = Maybe a
       or
          hole_ty = forall a b. a -> b
          cand_ty = forall x y. Either x y
    2. A hole fit identifier that is not polymorphic when the hole type
       is polymorphic, e.g.
         hole_ty = forall a. a -> a
         cand_ty = Int -> Int
  
  -------------------------
  Metric Decrease:
      hard_hole_fits
  -------------------------
  

• 30e513ba
  by Cheng Shao at 2025-12-22T17:12:00-05:00

  configure: remove unused win32-tarballs.md5sum
  
  This patch removes the unused `win32-tarballs.md5sum` file from the
  tree. The current mingw tarball download logic in
  `mk/get-win32-tarballs.py` fetches and checks against `SHA256SUM` from
  the same location where the tarballs are fetched, and this file has
  been unused for a few years.
  

• a2d52b3b
  by Wolfgang Jeltsch at 2025-12-23T04:47:33-05:00

  Add an operation `System.IO.hGetNewlineMode`
  
  This commit also contains some small code and documentation changes for
  related operations, for the sake of consistency.
  

• b26d134a
  by Cheng Shao at 2025-12-23T04:48:15-05:00

  rts: opportunistically reclaim slop space in shrinkMutableByteArray#
  
  Previously, `shrinkMutableByteArray#` shrinks a `MutableByteArray#`
  in-place by assigning the new size to it, and zeroing the extra slop
  space. That slop space is not reclaimed and wasted. But it's often the
  case that we allocate a `MutableByteArray#` upfront, then shrink it
  shortly after, so the `MutableByteArray#` closure sits right at the
  end of a nursery block; this patch identifies such chances, and also
  shrink `bd->free` if possible, reducing heap space fragmentation.
  
  Co-authored-by: Codex <codex@openai.com>
  
  -------------------------
  Metric Decrease:
      T10678
  -------------------------
  

• c72ddabf
  by Cheng Shao at 2025-12-23T16:13:23-05:00

  hadrian: fix bootstrapping with ghc-9.14
  
  This patch fixes bootstrapping GHC with ghc-9.14, tested locally with
  ghc-9.14.1 release as bootstrapping GHC.
  

• 0fd6d8e4
  by Cheng Shao at 2025-12-23T16:14:05-05:00

  hadrian: pass -keep-tmp-files to test ghc when --keep-test-files is enabled
  
  This patch makes hadrian pass `-keep-tmp-files` to test ghc when
  `--keep-test-files` is enabled, so you can check the ghc intermediate
  files when debugging certain test failures. Closes #26688.
  

• 81d10134
  by Cheng Shao at 2025-12-24T06:11:52-05:00

  configure: remove dead code in configure scripts
  
  This patch removes dead code in our configure scripts, including:
  
  - Variables and auto-detected programs that are not used
  - autoconf functions that are not used, or export a variable that's
    not used
  - `AC_CHECK_HEADERS` invocations that don't have actual corresponding
    `HAVE_XXX_H` usage
  - Other dead code (e.g. stray `AC_DEFUN()`)
  
  Co-authored-by: Codex <codex@openai.com>
  

• fb1381c3
  by Wolfgang Jeltsch at 2025-12-24T06:12:34-05:00

  Remove unused known keys and names for list operations
  
  This removes the known-key and corresponding name variables for
  `concat`, `filter`, `zip`, and `(++)`, as they are apparently nowhere
  used in GHC’s source code.
  

• 7b9c20f4
  by Recursion Ninja at 2025-12-24T10:35:36-05:00

  Decoupling Language.Haskell.Syntax.Binds from GHC.Types.Basic
  by transferring InlinePragma types between the modules.
  
    * Moved InlinePragma data-types to Language.Haskell.Syntax.Binds.InlinePragma
  
    * Partitioned of Arity type synonyms to GHC.Types.Arity
  
    * InlinePragma is now extensible via Trees That Grow
  
    * Activation is now extensible via Trees That Grow
  
    * Maybe Arity change to more descriptive InlineSaturation data-type
  
    * InlineSaturation information removed from InlinePragma during GHS parsing pass
  
    * Cleaned up the exposed module interfaces of the new modules
  

• a3afae0c
  by Simon Peyton Jones at 2025-12-25T15:26:36-05:00

  Check for rubbish literals in Lint
  
  Addresses #26607.
  
  See new Note [Checking for rubbish literals] in GHC.Core.Lint
  

• 8a317b6f
  by Aaron Allen at 2026-01-01T03:05:15-05:00

  [#26183] Associated Type Iface Fix
  
  When determining "extras" for class decl interface entries, axioms for
  the associated types need to included so that dependent modules will be
  recompiled if those axioms change.
  
  resolves #26183
  

• ae1aeaab
  by Cheng Shao at 2026-01-01T03:06:32-05:00

  testsuite: run numeric tests with optasm when available
  
  This patch adds the `optasm` extra way to nueric tests when NCG is
  available. Some numeric bugs only surface with optimization, omitting
  this can hide these bugs and even make them slip into release! (e.g. #26711)
  

• 6213bb57
  by maralorn at 2026-01-02T16:30:32+01:00

  GHC.Internal.Exception.Context: Fix comment
  
  on addExceptionAnnotation

• b820ff50
  by Janis Voigtlaender at 2026-01-05T02:43:18-05:00

  GHC.Internal.Control.Monad.replicateM: Fix comment
  

• a8a94aad
  by Cheng Shao at 2026-01-05T16:24:04-05:00

  hadrian: drops unused PE linker script for windows
  
  This patch drops unused PE linker script for windows in the
  `MergeObjects` builder of hadrian. The linker script is used for
  merging object files into a single `HS*.o` object file and undoing the
  effect of split sections, when building the "ghci library" object
  file. However, we don't build the ghci library on windows, and this
  code path is actually unreachable.
  

• 53038ea9
  by Cheng Shao at 2026-01-05T16:24:04-05:00

  hadrian: drop unused logic for building ghci libraries
  
  This patch drops the unused logic for building ghci libraries in
  hadrian:
  
  - The term "ghci library" refers to an optional object file per
    library `HS*.o`, which is merged from multiple object files in that
    library using the `MergeObjects` builder in hadrian.
  - The original rationale of having a ghci library object, in addition
    to normal archives, was to speedup ghci loading, since the combined
    object is linked with a linker script to undo the effects of
    `-fsplit-sections` to reduce section count and make it easier for
    the RTS linker to handle.
  - However, most GHC builds enable `dynamicGhcPrograms` by default, in
    such cases the ghci library would already not be built.
  - `dynamicGhcPrograms` is disabled on Windows, but still we don't
    build the ghci library due to lack of functioning merge objects
    command.
  - The only case that we actually build ghci library objects, are
    alpine fully static bindists. However, for other reasons, split
    sections is already disabled for fully static builds anyway!
  - There will not be any regression if the ghci library objects are
    absent from a GHC global libdir when `dynamicGhcPrograms` is
    disabled. The RTS linker can already load the archives without any
    issue.
  
  Hence the removal. We now forcibly disable ghci libraries for all
  Cabal components, and rip out all logic related to `MergeObjects` and
  ghci libraries in hadrian. This also nicely cleans up some old todos
  and fixmes that are no longer relevant.
  
  Note that MergeObjects in hadrian is not the same thing as merge
  objects in the GHC driver. The latter is not affected by this patch.
  
  -------------------------
  Metric Decrease:
      libdir
  -------------------------
  
  Co-authored-by: Codex <codex@openai.com>
  

• 8f209336
  by Simon Jakobi at 2026-01-05T16:24:48-05:00

  User's guide: Fix link to language extensions
  
  Instead of linking to haddocks, it seemed more useful to link
  to the extension overview in the user's guide.
  
  Closes #26614.
  

• 0b7df6db
  by Simon Peyton Jones at 2026-01-06T09:32:23-05:00

  Improved fundeps for closed type families
  
  The big payload of this commit is to execute the plan suggested
  in #23162, by improving the way that we generate functional
  dependencies for closed type families.
  
  It is all described in Note [Exploiting closed type families]
  
  Most of the changes are in GHC.Tc.Solver.FunDeps
  
  Other small changes
  
  * GHC.Tc.Solver.bumpReductionDepth.  This function brings together the code that
     * Bumps the depth
     * Checks for overflow
    Previously the two were separated, sometimes quite widely.
  
  * GHC.Core.Unify.niFixSubst: minor improvement, removing an unnecessary
    itraetion in the base case.
  
  * GHC.Core.Unify: no need to pass an InScopeSet to
    tcUnifyTysForInjectivity. It can calculate one for itself; and it is
    never inspected anyway so it's free to do so.
  
  * GHC.Tc.Errors.Ppr: slight impovement to the error message for
    reduction-stack overflow, when a constraint (rather than a type) is
    involved.
  
  * GHC.Tc.Solver.Monad.wrapUnifier: small change to the API
  

• fde8bd88
  by Simon Peyton Jones at 2026-01-06T09:32:23-05:00

  Add missing (KK4) to kick-out criteria
  
  There was a missing case in kick-out that meant we could fail
  to solve an eminently-solvable constraint.
  
  See the new notes about (KK4)
  

• 00082844
  by Simon Peyton Jones at 2026-01-06T09:32:23-05:00

  Some small refactorings of error reporting in the typechecker
  
  This is just a tidy-up commit.
  
  * Add ei_insoluble to ErrorItem, to cache insolubility.
    Small tidy-up.
  
  * Remove `is_ip` and `mkIPErr` from GHC.Tc.Errors; instead enhance mkDictErr
    to handle implicit parameters.  Small refactor.
  

• fe4cb252
  by Simon Peyton Jones at 2026-01-06T09:32:24-05:00

  Improve recording of insolubility for fundeps
  
  This commit addresses #22652, by recording when the fundeps for
  a constraint are definitely insoluble.  That in turn improves the
  perspicacity of the pattern-match overlap checker.
  
  See Note [Insoluble fundeps]
  

• df0ffaa5
  by Simon Peyton Jones at 2026-01-06T09:32:24-05:00

  Fix a buglet in niFixSubst
  
  The MR of which this is part failed an assertion check extendTvSubst
  because we extended the TvSubst with a CoVar.  Boo.
  
  This tiny patch fixes it, and adds the regression test from #13882
  that showed it up.
  

• 3d6aba77
  by konsumlamm at 2026-01-06T09:33:16-05:00

  Fix changelog formatting

• 69e0ab59
  by Cheng Shao at 2026-01-06T19:37:56-05:00

  compiler: add targetHasRTSWays function
  
  This commit adds a `targetHasRTSWays` util function in
  `GHC.Driver.Session` to query if the target RTS has a given Ways (e.g.
  WayThreaded).
  

• 25a0ab94
  by Cheng Shao at 2026-01-06T19:37:56-05:00

  compiler: link on-demand external interpreter with threaded RTS
  
  This commit makes the compiler link the on-demand external interpreter
  program with threaded RTS if it is available in the target RTS ways.
  This is a better default than the previous single-threaded RTS, and it
  enables the external interpreter to benefit from parallelism when
  deserializing CreateBCOs messages.
  

• 92404a2b
  by Cheng Shao at 2026-01-06T19:37:56-05:00

  hadrian: link iserv with threaded RTS
  
  This commit makes hadrian link iserv with threaded RTS if it's
  available in the RTS ways. Also cleans up the iserv main C program
  which can be replaced by the `-fkeep-cafs` link-time option.
  

• a20542d2
  by Cheng Shao at 2026-01-06T19:38:38-05:00

  ghc-internal: remove unused GMP macros
  
  This patch removes unused GMP related macros from `ghc-internal`. The
  in-tree GMP version was hard coded and outdated, but it was not used
  anywhere anyway.
  

• 4079dcd6
  by Cheng Shao at 2026-01-06T19:38:38-05:00

  hadrian: fix in-tree gmp configure error on newer c compilers
  
  Building in-tree gmp on newer c compilers that default to c23 fails at
  configure stage, this patch fixes it, see added comment for
  explanation.
  

• 414d1fe1
  by Cheng Shao at 2026-01-06T19:39:20-05:00

  compiler: fix LLVM backend pdep/pext handling for i386 target
  
  This patch fixes LLVM backend's pdep/pext handling for i386 target,
  and also removes non-existent 128/256/512 bit hs_pdep/hs_pext callees.
  See amended note for more explanation. Fixes #26450.
  
  Co-authored-by: Codex <codex@openai.com>
  

• c7f6fba3
  by Cheng Shao at 2026-01-06T19:39:20-05:00

  ci: remove allow_failure flag for i386 alpine job
  
  The LLVM codegen issue for i386 has been fixed, and the i386 alpine
  job should pass now. This commit removes the allow_failure flag so
  that other i386 regressions in the future are signaled more timely.
  

• 52d00c05
  by Simon Peyton Jones at 2026-01-07T10:24:21-05:00

  Add missing InVar->OutVar lookup in SetLevels
  
  As #26681 showed, the SetLevels pass was failing to map an InVar to
  an OutVar.  Very silly!  I'm amazed it hasn't broken before now.
  
  I have improved the type singatures (to mention InVar and OutVar)
  so it's more obvious what needs to happen.
  

• ab0a5594
  by Cheng Shao at 2026-01-07T10:25:04-05:00

  hadrian: drop deprecated pkgHashSplitObjs code path
  
  This patch drops deprecated `pkgHashSplitObjs` code path from hadrian,
  since GHC itself has removed split objs support many versions ago and
  this code path is unused.
  

• bb3a2ba1
  by Cheng Shao at 2026-01-07T10:25:44-05:00

  hadrian: remove linting/assertion in quick-validate flavour
  
  The `quick-validate` flavour is meant for testing ghc and passing the
  testsuite locally with similar settings to `validate` but faster. This
  patch removes the linting/assertion overhead in `quick-validate` to
  improve developer experience. I also took the chance to simplify
  redundant logic of rts/library way definition in `validate` flavour.
  

• 7971f5dd
  by Cheng Shao at 2026-01-07T10:26:26-05:00

  deriveConstants: clean up unused constants
  
  This patch cleans up unused constants from `deriveConstants`, they are
  not used by C/Cmm code in the RTS, nor compiler-generated code.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 4df96993
  by Cheng Shao at 2026-01-07T10:27:08-05:00

  hadrian: pass -fno-omit-frame-pointer with +debug_info
  
  This patch adds `-fno-omit-frame-pointer` as C/C++ compilation flag
  when compiling with `+debug_info` flavour transformer. It's a sane
  default when you care about debugging and reliable backtraces, and
  makes debugging/profiling with bpf easier.
  

• 8a3900a3
  by Aaron Allen at 2026-01-07T10:27:57-05:00

  [26705] Include TyCl instances in data fam iface entry
  
  Ensures dependent modules are recompiled when the class instances for a
  data family instance change.
  
  resolves #26705
  

• a0b980af
  by Cheng Shao at 2026-01-07T10:28:38-05:00

  hadrian: remove unused Hp2Ps/Hpc builders
  
  This patch removes the Hp2Ps/Hpc builders from hadrian, they are
  unused in the build system. Note that the hp2ps/hpc programs are still
  built and not affected.
  

• 50a58757
  by Cheng Shao at 2026-01-07T10:29:20-05:00

  hadrian: only install js files to libdir for wasm/js targets
  
  There are certain js files required for wasm/js targets to work, and
  previously hadrian would install those js files to libdir
  unconditionally on other targets as well. This could be a minor
  annoyance for packagers especially when the unused js files contain
  shebangs that interfere with the packaging process. This patch makes
  hadrian only selectively install the right js files for the right
  targets.
  
  Co-authored-by: Codex <codex@openai.com>
  

• da40e553
  by Simon Peyton Jones at 2026-01-07T10:30:00-05:00

  Add flavour transformer assertions_stage1
  
  This allows us to enable -DDEBUG assertions in the stage1 compiler
  

• ec3cf767
  by Cheng Shao at 2026-01-08T06:24:31-05:00

  make: remove unused Makefiles from legacy make build system
  
  This patch removes unused Makefiles from legacy make build system; now
  they are never used by hadrian in any way, and they already include
  common boilerplate mk files that are long gone in the make build
  system removal, hence the housecleaning.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 04ea3f83
  by Cheng Shao at 2026-01-08T06:25:13-05:00

  compiler: use -O3 as LLVM optimization level for ghc -O2
  
  The GHC driver clamps LLVM optimization level to `-O2` due to LLVM
  crashes, but those were historical issues many years ago that are no
  longer relevant for LLVM versions we support today. This patch changes
  the driver to use `-O3` as LLVM optimization level when compiling with
  `-O2`, which is a better default when we're willing to trade
  compilation time for faster generated code.
  

• 472df471
  by Peter Trommler at 2026-01-08T13:28:54-05:00

  Use half-word literals in info tables
  
  With this commit info tables are mapped to the same assembler code
  on big-endian and little-endian platforms.
  
  Fixes #26579.
  

• 393f9c51
  by Simon Peyton Jones at 2026-01-08T13:29:35-05:00

  Refactor srutOkForBinderSwap
  
  This MR does a small refactor:
  
  * Moves `scrutOkForBinderSwap` and `BinderSwapDecision`
    to GHC.Core.Utils
  
  * Inverts the sense of the coercion it returns, which makes
    more sense
  
  No effect on behaviour
  

• ad76fb0f
  by Simon Peyton Jones at 2026-01-08T13:29:36-05:00

  Improve case merging
  
  This small MR makes case merging happen a bit more often than
  it otherwise could, by getting join points out of the way.
  
  See #26709 and GHC.Core.Utils
    Note [Floating join points out of DEFAULT alternatives]
  

• 4c9395f5
  by Cheng Shao at 2026-01-08T13:30:16-05:00

  hadrian: remove broken hsc2hs flag when cross compiling to windows
  
  This patch removes the `--via-asm` hsc2hs flag when cross compiling to
  windows. With recent llvm-mingw toolchain, it would fail with:
  
  ```
  x86_64-w64-mingw32-hsc2hs: Cannot combine instructions: [Quad 8,Long 4,Long 241,Ref ".Ltmp1-.Ltmp0"]
  ```
  
  The hsc2hs default `--cross-compile` logic is slower but works.
  

• 71fdef55
  by Simon Peyton Jones at 2026-01-08T13:30:57-05:00

  Try harder to keep the substitution empty
  
  Avoid unnecessary cloning of variables in the Simplifier.
  
  Addresses #26724,
  
  See Note [Keeping the substitution empty]
  
  We get some big wins in compile time
  
  Metrics: compile_time/bytes allocated
  -------------------------------------
                                           Baseline
                      Test    Metric          value      New value Change
  ----------------------------------------------------------------------------
  CoOpt_Singletons(normal) ghc/alloc    721,544,088    692,174,216  -4.1% GOOD
       LargeRecord(normal) ghc/alloc  1,268,031,157  1,265,168,448  -0.2%
            T14766(normal) ghc/alloc    918,218,533    688,432,296 -25.0% GOOD
            T15703(normal) ghc/alloc    318,103,629    306,638,016  -3.6% GOOD
            T17836(normal) ghc/alloc    419,174,584    418,400,824  -0.2%
            T18478(normal) ghc/alloc    471,042,976    470,261,376  -0.2%
            T20261(normal) ghc/alloc    573,387,162    563,663,336  -1.7%
            T24984(normal) ghc/alloc     87,832,666     87,636,168  -0.2%
            T25196(optasm) ghc/alloc  1,103,284,040  1,101,376,992  -0.2%
    hard_hole_fits(normal) ghc/alloc    224,981,413    224,608,208  -0.2%
  
                 geo. mean                                          -0.3%
                 minimum                                           -25.0%
                 maximum                                            +0.1%
  
  Metric Decrease:
      CoOpt_Singletons
      T14766
      T15703
  

• 30341168
  by Simon Peyton Jones at 2026-01-08T13:31:38-05:00

  Add regression test for #24867
  

• 1ac1a541
  by Julian Ospald at 2026-01-09T02:48:53-05:00

  Support statically linking executables properly
  
  Fixes #26434
  
  In detail, this does a number of things:
  * Makes GHC aware of 'extra-libraries-static' (this changes the package
    database format).
  * Adds a switch '-static-external' that will honour 'extra-libraries-static'
    to link external system dependencies statically.
  * Adds a new field to settings/targets: "ld supports verbatim namespace".
    This field is used by '-static-external' to conditionally use '-l:foo.a'
    syntax during linking, which is more robust than trying to find the
    absolute path to an archive on our own.
  * Adds a switch '-fully-static' that is meant as a high-level interface
    for e.g. cabal. This also honours 'extra-libraries-static'.
  
  This also attempts to clean up the confusion around library search directories.
  At the moment, we have 3 types of directories in the package database
  format:
  * library-dirs
  * library-dirs-static
  * dynamic-library-dirs
  
  However, we only have two types of linking: dynamic or static. Given the
  existing logic in 'mungeDynLibFields', this patch assumes that
  'library-dirs' is really just nothing but a fallback and always
  prefers the more specific variants if they exist and are non-empty.
  
  Conceptually, we should be ok with even just one search dirs variant.
  Haskell libraries are named differently depending on whether they're
  static or dynamic, so GHC can conveniently pick the right one depending
  on the linking needs. That means we don't really need to play tricks
  with search paths to convince the compiler to do linking as we want it.
  For system C libraries, the convention has been anyway to place static and
  dynamic libs next to each other, so we need to deal with that issue
  anyway and it is outside of our control. But this is out of the scope
  of this patch.
  
  This patch is backwards compatible with cabal. Cabal should however
  be patched to use the new '-fully-static' switch.
  

• ad3c808d
  by Julian Ospald at 2026-01-09T02:48:53-05:00

  Warn when "-dynamic" is mixed with "-staticlib"
  

• 322dd672
  by Matthew Pickering at 2026-01-09T02:49:35-05:00

  rts: Use INFO_TABLE_CONSTR for stg_dummy_ret_closure
  
  Since the closure type is CONSTR_NOCAF, we need to use INFO_TABLE_CONSTR
  to populate the constructor description field (this crashes ghc-debug
  when decoding AP_STACK frames sometimes)
  
  Fixes #26745
  

• 039bac4c
  by Ben Gamari at 2026-01-09T20:22:16-05:00

  ghc-internal: Move STM utilities out of GHC.Internal.Conc.Sync
  
  This is necessary to avoid an import cycle on Windows when importing
  `GHC.Internal.Exception.Context` in `GHC.Internal.Conc.Sync`.
  
  On the road to address #25365.
  

• 8c389e8c
  by Ben Gamari at 2026-01-09T20:22:16-05:00

  base: Capture backtrace from throwSTM
  
  Implements core-libraries-committee#297.
  
  Fixes #25365.
  

• e1ce1fc3
  by Ben Gamari at 2026-01-09T20:22:16-05:00

  base: Annotate rethrown exceptions in catchSTM with WhileHandling
  
  Implements core-libraries-committee#298
  

• c4ebdbdf
  by Cheng Shao at 2026-01-09T20:23:06-05:00

  compiler: make getPrim eagerly evaluate its result
  
  This commit makes `GHC.Utils.Binary.getPrim` eagerly evaluate its
  result, to avoid accidental laziness when future patches build other
  binary parsers using `getPrim`.
  

• 66a0c4f7
  by Cheng Shao at 2026-01-09T20:23:06-05:00

  compiler: implement fast get/put for Word16/Word32/Word64
  
  Previously, `GHC.Utils.Binary` contains `get`/`put` functions for
  `Word16`/`Word32`/`Word64` which always loads and stores them as
  big-endian words at a potentially unaligned address. The previous
  implementation is based on loads/stores of individual bytes and
  concatenating bytes with bitwise operations, which currently cannot be
  fused to a single load/store operation by GHC.
  
  This patch implements fast `get`/`put` functions for
  `Word16`/`Word32`/`Word64` based on a single memory load/store, with
  an additional `byteSwap` operation on little-endian hosts. It is based
  on unaligned load/store primops added since GHC 9.10, and we already
  require booting with at least 9.10, so it's about time to switch to
  this faster path.
  

• 641ec3f0
  by Simon Peyton Jones at 2026-01-09T20:23:55-05:00

  Fix scoping errors in specialisation
  
  Using -fspecialise-aggressively in #26682 showed up a couple of
  subtle errors in the type-class specialiser.
  
  * dumpBindUDs failed to call `deleteCallsMentioning`, resulting in a
    call that mentioned a dictionary that was not in scope.  This call
    has been missing since 2009!
      commit c43c981705ec33da92a9ce91eb90f2ecf00be9fe
      Author: Simon Peyton Jones <simonpj@microsoft.com>
      Date:   Fri Oct 23 16:15:51 2009 +0000
  
    Fixed by re-combining `dumpBindUDs` and `dumpUDs`.
  
  * I think there was another bug involving the quantified type
    variables in polymorphic specialisation. In any case I refactored
    `specHeader` and `spec_call` so that the former looks for the
    extra quantified type variables rather than the latter.  This
    is quite a worthwhile simplification: less code, easier to grok.
  
  Test case in simplCore/should_compile/T26682,
  brilliantly minimised by @sheaf.
  

• 2433e91d
  by Cheng Shao at 2026-01-09T20:24:43-05:00

  compiler: change sectionProtection to take SectionType argument
  
  This commit changes `sectionProtection` to only take `SectionType`
  argument instead of whole `Section`, since it doesn't need the Cmm
  section content anyway, and it can then be called in parts of NCG
  where we only have a `SectionType` in scope.
  

• e5926fbe
  by Cheng Shao at 2026-01-09T20:24:43-05:00

  compiler: change isInitOrFiniSection to take SectionType argument
  
  This commit changes `isInitOrFiniSection` to only take `SectionType`
  argument instead of whole `Section`, since it doesn't need the Cmm
  section content anyway, and it can then be called in parts of NCG
  where we only have a `SectionType` in scope. Also marks it as
  exported.
  

• 244d57d7
  by Cheng Shao at 2026-01-09T20:24:43-05:00

  compiler: fix split sections on windows
  
  This patch fixes split sections on windows by emitting the right
  COMDAT section header in NCG, see added comment for more explanation.
  Fix #26696 #26494.
  
  -------------------------
  Metric Decrease:
      LargeRecord
      T9675
      size_hello_artifact
      size_hello_artifact_gzip
      size_hello_unicode
      size_hello_unicode_gzip
  Metric Increase:
      T13035
  -------------------------
  
  Co-authored-by: Codex <codex@openai.com>
  

• 182f3d0f
  by Cheng Shao at 2026-01-09T20:25:28-05:00

  iserv: add comment about -fkeep-cafs
  

• 49675b69
  by Matthew Craven at 2026-01-09T20:26:14-05:00

  Account for "stupid theta" in demand sig for DataCon wrappers
  
  Fixes #26748.
  

• f3c18890
  by Samuel Thibault at 2026-01-10T15:48:22+01:00

  hurd: Fix getExecutablePath build
  
  3939a8bf93e27 ("GNU/Hurd: Add getExecutablePath support") added using
  /proc/self/exe for GNU/Hurd but missed adding the required imports for
  the corresponding code.
  

• 7f15bd15
  by Samuel Thibault at 2026-01-12T07:16:25-05:00

  Fix the OS string encoding for GNU/Hurd
  
  Following https://github.com/haskell/cabal/pull/9434/files , and as seen
  in the various gnu_HOST_OS usages in the source code, it is expected that
  GNU/Hurd is advertised as "gnu", like the autotools do.
  

• 1db2f240
  by Andrew Lelechenko at 2026-01-12T07:17:06-05:00

  Add since annotation for Data.Bifoldable1
  
  Fixes #26432
  

• e038a383
  by Sven Tennie at 2026-01-12T07:17:49-05:00

  Ignore Windows CI tool directories in Git
  
  Otherwise, we see thousands of changes in `git status` which is very
  confusing to work with.
  

• 023c301c
  by sheaf at 2026-01-13T04:57:30-05:00

  Don't re-use stack slots for growing registers
  
  This commit avoids re-using a stack slot for a register that has grown
  but already had a stack slot.
  
  For example, suppose we have stack slot assigments
  
    %v1 :: FF64 |-> StackSlot 0
    %v2 :: FF64 |-> StackSlot 1
  
  Later, we start using %v1 at a larger format (e.g. F64x2) and we need
  to spill it again. Then we **must not** use StackSlot 0, as a spill
  at format F64x2 would clobber the data in StackSlot 1.
  
  This can cause some fragmentation of the `StackMap`, but that's probably
  OK.
  
  Fixes #26668
  

• d0966e64
  by fendor at 2026-01-13T04:58:11-05:00

  Remove `traceId` from ghc-pkg executable
  

• 20d7efec
  by Simon Peyton Jones at 2026-01-13T12:41:22-05:00

  Make SpecContr rules fire a bit later
  
  See #26615 and Note [SpecConstr rule activation]
  

• 8bc4eb8c
  by Andrew Lelechenko at 2026-01-13T12:42:03-05:00

  Upgrade mtl submodule to 2.3.2
  
  Fixes #26656
  

• c94aaacd
  by Cheng Shao at 2026-01-13T12:42:44-05:00

  compiler: remove iserv and only use on-demand external interpreter
  
  This patch removes `iserv` from the tree completely. Hadrian would no
  longer build or distribute `iserv`, and the GHC driver would use the
  on-demand external interpreter by default when invoked with
  `-fexternal-interpreter`, without needing to specify `-pgmi ""`. This
  has multiple benefits:
  
  - It allows cleanup of a lot of legacy hacks in the hadrian codebase.
  - It paves the way for running cross ghc's iserv via cross emulator
    (#25523), fixing TH/ghci support for cross targets other than
    wasm/js.
  

• c1fe0097
  by Peter Trommler at 2026-01-14T03:54:49-05:00

  PPC NCG: Fix shift right MO code
  
  The shift amount in shift right [arithmetic] MOs is machine word
  width. Therefore remove unnecessary zero- or sign-extending of
  shift amount.
  
  It looks harmless to extend the shift amount argument because the
  shift right instruction uses only the seven lowest bits (i. e. mod 128).
  But now we have a conversion operation from a smaller type to word width
  around a memory load at word width. The types are not matching up but
  there is no check done in CodeGen. The necessary conversion from word
  width down to the smaller width would be translated into a no-op on
  PowerPC anyway. So all seems harmless if it was not for a small
  optimisation in getRegister'.
  
  In getRegister' a load instruction with the smaller width of the
  conversion operation was generated. This loaded the most significant
  bits of the word in memory on a big-endian platform. These bits were
  zero and hence shift right was used with shift amount zero and not one
  as required in test Sized.
  
  Fixes #26519
  

• 2dafc65a
  by Cheng Shao at 2026-01-14T03:55:31-05:00

  Tree-wide cleanup of cygwin logic
  
  GHC has not supported cygwin for quite a few years already, and will
  not resume support in the forseeable future. The only supported
  windows toolchain is clang64/clangarm64 of the msys2 project. This
  patch cleans up the unused cygwin logic in the tree.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 66b96e2a
  by Teo Camarasu at 2026-01-14T03:56:13-05:00

  Set default eventlog-flush-interval to 5s
  
  Resolves #26707
  

• d0254579
  by Andrew Lelechenko at 2026-01-14T03:56:53-05:00

  Document when -maxN RTS option was added
  

• f25e2b12
  by Cheng Shao at 2026-01-14T11:10:39-05:00

  testsuite: remove obsolete --ci option from the testsuite driver
  
  This patch removes the obsolete `--ci` option from the testsuite
  driver: neither the CI scripts nor hadrian ever invokes the testsuite
  driver with `--ci`, and the perf notes are always fetched to the
  `refs/notes/perf` local reference anyway.
  

• 7964763b
  by Julian Ospald at 2026-01-14T11:11:31-05:00

  Fix fetch_cabal
  
  * download cabal if the existing one is of an older version
  * fix FreeBSD download url
  * fix unpacking on FreeBSD
  

• 6b0129c1
  by Julian Ospald at 2026-01-14T11:11:31-05:00

  Bump toolchain in CI
  

• 0f53ccc6
  by Julian Ospald at 2026-01-14T11:11:31-05:00

  Use libffi-clib
  
  Previously, we would build libffi via hadrian
  and bundle it manually with the GHC bindist.
  
  This now moves all that logic out of hadrian
  and allows us to have a clean Haskell package
  to build and link against and ship it without
  extra logic.
  
  This patch still retains the ability to link
  against a system libffi.
  
  The main reason of bundling libffi was that on
  some platforms (e.g. FreeBSD and Mac), system libffi
  is not visible to the C toolchain by default,
  so users would require settings in e.g. cabal
  to be able to compile anything.
  
  This adds the submodule libffi-clib to the repository.
  

• 5e1cd595
  by Peng Fan at 2026-01-14T11:12:26-05:00

  NCG/LA64: add support for la664 micro architecture
  
  Add '-mla664' flag to LA664, which has some new features:
  atomic instructions, dbar hints, etc.
  
  'LA464' is the default so that unrecognized instructions are not
  generated.
  

• c56567ec
  by Simon Peyton Jones at 2026-01-15T23:19:04+00:00

  Add evals for strict data-con args in worker-functions
  
  This fixes #26722, by adding an eval in a worker for
  arguments of strict data constructors, even if the
  function body uses them strictly.
  
  See (WIS1) in Note [Which Ids should be strictified]
  
  I took the opportunity to make substantial improvements in the
  documentation for call-by-value functions.  See especially
     Note [CBV Function Ids: overview] in GHC.Types.Id.Info
     Note [Which Ids should be CBV candidates?] ditto
     Note [EPT enforcement] in GHC.Stg.EnforceEpt
  among others.
  

• 9719ce5d
  by Simon Peyton Jones at 2026-01-15T23:19:04+00:00

  Improve `interestingArg`
  
  This function analyses a function's argument to see if it is
  interesting enough to deserve an inlining discount. Improvements
  for
    * LitRubbish arguments
    * exprIsExpandable arguments
  
  See Note [Interesting arguments] which is substantially rewritten.
  

• 7b616b9f
  by Cheng Shao at 2026-01-16T06:45:00-05:00

  compiler: fix regression when compiling foreign stubs in the rts unit
  
  This patch fixes a regression when compiling foreign stubs in the rts
  unit introduced in 05e25647f72bc102061af3f20478aa72bff6ff6e. A simple
  revert would fix it, but it's better to implement a proper fix with
  comment for better understanding of the underlying problem, see the
  added comment for explanation.
  
  Co-authored-by: Codex <codex@openai.com>
  

• c343ef64
  by Sylvain Henry at 2026-01-16T06:45:51-05:00

  base: remove GHC.JS.Prim.Internal.Build (#23432)
  
  See accepted CLC proposal https://github.com/haskell/core-libraries-committee/issues/329
  

• 29c0aceb
  by Simon Peyton Jones at 2026-01-16T17:18:11-05:00

  Improve newtype unwrapping
  
  Ticket #26746 describes several relatively-minor shortcomings of newtype
  unwrapping.  This MR addresses them, while also (arguably) simplifying
  the code a bit.
  
  See new Note [Solving newtype equalities: overview]
  and     Note [Decomposing newtype equalities]
  and     Note [Eager newtype decomposition]
  and     Note [Even more eager newtype decomposition]
  
  For some reason, on Windows only, runtime allocations decrease for test
  T5205 (from 52k to 48k).  I have not idea why. No change at all on Linux.
  I'm just going to accept the change.  (I saw this same effect in another
  MR so I think it's a fault in the baseline.)
  
  Metric Decrease:
      T5205
  

• 8b59e62c
  by Andreas Klebinger at 2026-01-16T17:18:52-05:00

  testsuite: Widen acceptance window for T5205.
  
  Fixes #26782
  

• 9e5e0234
  by mangoiv at 2026-01-17T06:03:03-05:00

  add a new issue template for getting verified
  
  To reduce spam created by new users, we will in future not grant
  any rights but reporting issues to new users. That is why we will
  have to be able to verify them. The added issue template serves that
  purpose.
  

• b18b2c42
  by Cheng Shao at 2026-01-17T06:03:44-05:00

  llvm: fix split sections for llvm backend
  
  This patch fixes split sections for llvm backend:
  
  - Pass missing `--data-sections`/`--function-sections` flags to
    llc/opt.
  - Use `@llvm.compiler.used` instead of `@llvm.used` to avoid sections
    being unnecessarily retained at link-time.
  
  Fixes #26770.
  
  -------------------------
  Metric Decrease:
      libdir
      size_hello_artifact
      size_hello_unicode
  -------------------------
  
  Co-authored-by: Codex <codex@openai.com>
  

• ebf66f67
  by Cheng Shao at 2026-01-17T13:16:50-05:00

  Update autoconf scripts
  
  Scripts taken from autoconf a2287c3041a3f2a204eb942e09c015eab00dc7dd
  

• 598624b9
  by Andreas Klebinger at 2026-01-17T13:17:32-05:00

  CString.hs: Update incorrect comment.
  
  Fixes #26322
  

• eea2036b
  by Cheng Shao at 2026-01-18T10:00:49-05:00

  libraries: bump haskeline submodule to 0.8.4.1
  
  This patch bumps the haskeline submodule to 0.8.4.1 which includes an
  important fix for an ANSI handling bug on Windows
  (https://github.com/haskell/haskeline/pull/126).
  

• 87d8f6c2
  by Cheng Shao at 2026-01-18T10:01:30-05:00

  hadrian: replace default -H32m/-H64m with -O64M to improve mutator productivity
  
  Most hadrian build flavours pass `-H32m`/`-H64m` to GHC as
  conventional wisdom to improve mutator productivity and reduce GC
  overhead. They were inherited from the legacy Make build system, and
  there used to be make flags to instrument a build process with
  `-Rghc-timing` option to collect GC stats of each GHC run from stderr.
  
  It's time to revisit whether there are better defaults for
  `-H32m`/`-H64m`, and this patch changes it to `-O64M` which indeed
  improves mutator productivity based on real statistics. `-O64M` is
  more aggressive than `-H64m`; it allows the old generation to grow to
  at least 64M before triggering major GC and reduces major GC runs.
  
  The stats of a clean build with `validate` flavour and `-H64m`:
  
  ```
  h64m.log
    matched RTS stat lines: 5499
    sum MUT cpu     : 2400.808 s
    sum GC cpu      : 1378.292 s
    sum MUT elapsed : 2788.253 s
    sum GC elapsed  : 1389.233 s
    GC/MUT cpu ratio     : 0.574 (GC is 57.4% of MUT)
    GC/MUT elapsed ratio : 0.498 (GC is 49.8% of MUT)
    GC fraction of (MUT+GC) cpu     : 36.5%
    GC fraction of (MUT+GC) elapsed : 33.3%
    per-line GC/MUT cpu ratio: median 0.691, p90 1.777
    per-line GC/MUT elapsed ratio: median 0.519, p90 1.081
  ```
  
  The stats of a clean build with `validate` flavour and `-O64M`:
  
  ```
  o64m.log
    matched RTS stat lines: 5499
    sum MUT cpu     : 2377.383 s
    sum GC cpu      : 1127.146 s
    sum MUT elapsed : 2758.857 s
    sum GC elapsed  : 1135.587 s
    GC/MUT cpu ratio     : 0.474 (GC is 47.4% of MUT)
    GC/MUT elapsed ratio : 0.412 (GC is 41.2% of MUT)
    GC fraction of (MUT+GC) cpu     : 32.2%
    GC fraction of (MUT+GC) elapsed : 29.2%
    per-line GC/MUT cpu ratio: median 0.489, p90 1.099
    per-line GC/MUT elapsed ratio: median 0.367, p90 0.806
  ```
  
  Mutator time is roughly in the same ballpark, but GC CPU time has
  reduced by 18.22%, and mutator productivity has increased from 63.5%
  to 67.8%.
  

• 8372e13d
  by Cheng Shao at 2026-01-18T10:02:12-05:00

  rts: remove unused .def files from rts/win32
  
  This patch removes unused .def files from `rts/win32`, given we don't
  build .dll files for rts/ghc-internal/ghc-prim at all. Even when we
  resurrect win32 dll support at some point in the future, these .def
  files still contain incorrect symbols anyway and won't be of any use.
  

• f6af485d
  by Cheng Shao at 2026-01-18T10:03:19-05:00

  .gitmodules: use gitlab mirror for the libffi-clib submodule
  
  This patch fixes .gitmodules to use the gitlab mirror for the
  libffi-clib submodule, to make it coherent with other submodules that
  allow ghc developers to experiment with wip branches in submodules for
  ghc patches. Fixes #26783.
  

• 41432d25
  by Cheng Shao at 2026-01-18T10:05:13-05:00

  hadrian: remove the horrible i386 speedHack
  
  When hadrian builds certain rts objects for i386, there's a horrible
  speedHack that forces -fno-PIC even for dynamic ways of those objects.
  This is not compatible with newer versions of gcc/binutils as well as
  clang/lld, and this patch removes it. Fixes #26792.
  

• 323eb8f0
  by Cheng Shao at 2026-01-18T21:48:19-05:00

  hadrian: enable split sections for cross stage0
  
  This patch fixes a minor issue with `splitSectionsArgs` in hadrian:
  previously, it's unconditionally disabled for stage0 libraries because
  it's not going to be shipped in the final bindists. But it's only true
  when not cross compiling. So for now we also need to enable it for
  cross stage0 as well.
  

• 3fadfefe
  by Andreas Klebinger at 2026-01-18T21:49:01-05:00

  RTS: Document -K behaviour better
  

• 30f442a9
  by Teo Camarasu at 2026-01-20T13:57:26-05:00

  base: don't expose GHC.Num.{BigNat, Integer, Natural}
  
  We no longer expose GHC.Num.{BigNat, Integer, Natural} from base instead users should get these modules from ghc-bignum.
  We make this change to insulate end users from changes to GHC's implementation of big numbers.
  Implements CLC proposal 359: https://github.com/haskell/core-libraries-committee/issues/359
  

• 75a9053d
  by Teo Camarasu at 2026-01-20T13:58:07-05:00

  base: deprecate GHC internals in GHC.Num
  
  Implements CLC proposal: https://github.com/haskell/core-libraries-committee/issues/360
  

• 9534b032
  by Andreas Klebinger at 2026-01-20T13:58:50-05:00

  ghc-experimental: Update Changelog
  
  I tried to reconstruct a high level overview of the changes and when
  they were made since we introduced it.
  
  Fixes #26506
  
  Co-authored-by: Teo Camarasu <teofilcamarasu@gmail.com>
  

• 346f2f5a
  by Cheng Shao at 2026-01-20T13:59:30-05:00

  hadrian: remove RTS options in ghc-in-ghci flavour
  
  This patch removes the RTS options passed to ghc in ghc-in-ghci
  flavour, to workaround command line argument handling issue in
  hls/hie-boot that results in `-O64M` instead of `+RTS -O64M -RTS`
  being passed to ghc. It's not a hadrian bug per se, since ghc's own
  ghc-in-ghci multi repl works fine, but we should still make sure HLS
  works. Closes #26801.
  

• 759fd15a
  by Andreas Klebinger at 2026-01-21T16:05:28-05:00

  Don't build GHC with -Wcompat
  
  Without bumping the boot compiler the warnings it produces are often not
  actionable leading to pointless noise.
  
  Fixes #26800
  

• 3172db94
  by Torsten Schmits at 2026-01-21T16:06:11-05:00

  Use the correct field of ModOrigin when formatting error message listing hidden reexports
  

• 485c12b2
  by Cheng Shao at 2026-01-21T16:06:54-05:00

  Revert "hadrian: handle findExecutable "" gracefully"
  
  This reverts commit 1e5752f64a522c4025365856d92f78073a7b3bba. The
  underlying issue has been fixed in
  https://github.com/haskell/directory/commit/75828696e7145adc09179111a0d631b9a09963a4
  and present since 1.3.9.0, and hadrian directory lower bound is
  1.3.9.0, so we can revert our own in house hack now.
  

• 5efb58dc
  by Cheng Shao at 2026-01-21T16:07:36-05:00

  rts: fix typo in TICK_ALLOC_RTS
  
  This patch fixes a typo in the `TICK_ALLOC_RTS` macro, the original
  `bytes` argument was silently dropped. The Cmm code has its own
  version of `TICK_ALLOC_RTS` not affected by this typo, it affected the
  C RTS, and went unnoticed because the variable `n` happened to also be
  available at its call site. But the number was incorrect. Also fixes
  its call site since `WDS()` is not available in C.
  

• c406ea69
  by Cheng Shao at 2026-01-21T16:07:36-05:00

  rts: remove broken & unused ALLOC_P_TICKY
  
  This patch removes the `ALLOC_P_TICKY` macro from the rts, it's
  unused, and its expanded code is already broken.
  

• 34a27e20
  by Simon Peyton Jones at 2026-01-21T16:08:17-05:00

  Make the implicit-parameter class have representational role
  
  This MR addresses #26737, by making the built-in class IP
  have a representational role for its second parameter.
  
  See Note [IP: implicit parameter class] in
    ghc-internal:GHC.Internal.Classes.IP
  
  In fact, IP is (unfortunately, currently) exposed by
  base:GHC.Base, so we ran a quick CLC proposal to
  agree the change:
    https://github.com/haskell/core-libraries-committee/issues/385
  
  Some (small) compilations get faster because they only need to
  load (small) interface file GHC.Internal.Classes.IP.hi,
  rather than (large) GHC.Internal.Classes.hi.
  
  Metric Decrease:
      T10421
      T12150
      T12425
      T24582
      T5837
      T5030
  

• ca79475f
  by Cheng Shao at 2026-01-21T16:09:00-05:00

  testsuite: avoid re.sub in favor of simple string replacements
  
  This patch refactors the testsuite driver and avoids the usage of
  re.sub in favor of simple string replacements when possible. The
  changes are not comprehensive, and there are still a lot of re.sub
  usages lingering around the tree, but this already addresses a major
  performance bottleneck in the testsuite driver that might has to do
  with quadratic or worse slowdown in cpython's regular expression
  engine when handling certain regex patterns with large strings.
  Especially on i386, and i386 jobs are the bottlenecks of all full-ci
  validate pipelines!
  
  Here are the elapsed times of testing x86_64/i386 with -j48 before
  this patch:
  
  x86_64: `Build completed in 6m06s`
  i386: `Build completed in 1h36m`
  
  And with this patch:
  
  x86_64: `Build completed in 4m55s`
  i386: `Build completed in 4m23s`
  
  Fixes #26786.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 88c93796
  by Zubin Duggal at 2026-01-21T16:09:42-05:00

  ghc-toolchain: Also configure windres on non-windows platforms.
  It may be needed for cross compilation.
  
  Fixes #24588
  

• 9788c0ec
  by Cheng Shao at 2026-01-21T16:10:24-05:00

  ghci: print external interpreter trace messages to stderr instead of stdout
  
  This patch makes ghci print external interpreter trace messages to
  stderr instead of stdout, which is a much saner choice for diagnostic
  information. Closes #26807.
  

• 0491f08a
  by Sylvain Henry at 2026-01-22T03:44:26-05:00

  GC: don't use CAS without PARALLEL_GC on
  
  If we're not using the parallel GC, there is no reason to do a costly
  CAS. This was flagged as taking time in a perf profile.
  

• 211a8f56
  by Sylvain Henry at 2026-01-22T03:44:26-05:00

  GC: suffix parallel GC with "par" instead of "thr"
  
  Avoid some potential confusion (see discussion in !15351).
  

• 77a23cbd
  by fendor at 2026-01-22T03:45:08-05:00

  Remove blanket ignore that covers libraries/
  

• 18bf7f5c
  by Léana Jiang at 2026-01-22T08:58:45-05:00

  doc: update Flavour type in hadrian user-settings
  

• 3d5a1365
  by Cheng Shao at 2026-01-22T08:59:28-05:00

  hadrian: add missing notCross predicate for stage0 -O0
  
  There are a few hard-coded hadrian args that pass -O0 when compiling
  some heavy modules in stage0, which only makes sense when not
  cross-compiling and when cross-compiling we need properly optimized
  stage0 packages. So this patch adds the missing `notCross` predicate
  in those places.
  

• ee937134
  by Matthew Pickering at 2026-01-22T09:00:10-05:00

  Fix ghc-experimental GHC.Exception.Backtrace.Experimental module
  
  This module wasn't added to the cabal file so it was never compiled or
  included in the library.
  

• 1b490f5a
  by Zubin Duggal at 2026-01-22T09:00:53-05:00

  hadrian: Add ghc-{experimental,internal}.cabal to the list of dependencies of the doc target
  We need these files to detect the version of these libraries
  
  Fixes #26738
  

• cdb74049
  by Cheng Shao at 2026-01-22T14:52:36-05:00

  rts: avoid Cmm loop to initialize Array#/SmallArray#
  
  Previously, `newArray#`/`newSmallArray#` called an RTS C function to
  allocate the `Array#`/`SmallArray#`, then used a Cmm loop to
  initialize the elements. Cmm doesn't have native for-loop so the code
  is a bit awkward, and it's less efficient than a C loop, since the C
  compiler can effectively vectorize the loop with optimizations.
  
  So this patch moves the loop that initializes the elements to the C
  side. `allocateMutArrPtrs`/`allocateSmallMutArrPtrs` now takes a new
  `init` argument and initializes the elements if `init` is non-NULL.
  

• 4c784f00
  by Cheng Shao at 2026-01-22T14:53:19-05:00

  Fix testsuite run for +ipe flavour transformer
  
  This patch makes the +ipe flavour transformer pass the entire
  testsuite:
  
  - An RTS debug option `-DI` is added, the IPE trace information is now
    only printed with `-DI`. The test cases that do require IPE trace
    are now run with `-DI`.
  - The testsuite config option `ghc_with_ipe` is added, enabled when
    running the testsuite with `+ipe`, which skips a few tests that are
    sensitive to eventlog output, allocation patterns etc that can fail
    under `+ipe`.
  
  This is the first step towards #26799.
  
  Co-authored-by: Codex <codex@openai.com>
  

• be8e5236
  by Ben Gamari at 2026-01-23T03:28:45-05:00

  hadrian: Bump QuickCheck upper bound
  
  This patch bumps QuickCheck upper bound to 2.18. selftest rule
  manually tested to work with current latest QuickCheck-2.17.1.0.
  

• 5aa328fb
  by Zubin Duggal at 2026-01-23T03:29:30-05:00

  Add genindex to index.rst. This adds a link to the index in the navigation bar.
  
  Fixes #26437
  

• 917ab8ff
  by Oleg Grenrus at 2026-01-23T10:52:55-05:00

  Export labelThread from Control.Concurrent
  

• 3f5e8d80
  by Cheng Shao at 2026-01-23T10:53:37-05:00

  ci: only push perf notes on master/release branches
  
  This patch fixes push_perf_notes logic in ci.sh to only push perf
  notes on master/release branches. We used to unconditionally push perf
  notes even in MRs, but the perf numbers in the wip branches wouldn't
  be used as baseline anyway, plus this is causing a space leak in the
  ghc-performance-notes repo. See #25317 for the perf notes repo size
  problem.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 414b9593
  by Cheng Shao at 2026-01-24T07:11:51-05:00

  ci: remove duplicate keys in .gitlab-ci.yml
  
  This patch removes accidentally duplicate keys in `.gitlab-ci.yml`.
  The YAML spec doesn't allow duplicate keys in the first place, and
  according to GitLab docs
  (https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors), the
  latest key overrides the earlier entries.
  

• e5cb5491
  by Cheng Shao at 2026-01-24T07:12:34-05:00

  hadrian: drop obsolete configure/make builder logic for libffi
  
  This patch drops obsolete hadrian logic around `Configure
  libffiPath`/`Make libffiPath` builders, they are no longer needed
  after libffi-clib has landed. Closes #26815.
  

• 2d160222
  by Simon Hengel at 2026-01-24T07:13:17-05:00

  Fix typo in roles.rst

• 56db94f7
  by Peter Trommler at 2026-01-26T11:26:18+01:00

  PPC NCG: Generate clear right insn at arch width
  
  The clear right immediate (clrrxi) is only available in word and
  doubleword width. Generate clrrxi instructions at architecture
  width for all MachOp widths.
  
  Fixes #24145
  

• 5957a8ad
  by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00

  Add operations for obtaining operating-system handles
  
  This contribution implements CLC proposal #369. It adds operations for
  obtaining POSIX file descriptors and Windows handles that underlie
  Haskell handles. Those operating system handles can also be obtained
  without such additional operations, but this is more involved and, more
  importantly, requires using internals.
  

• 86a0510c
  by Greg Steuck at 2026-01-27T06:12:34-05:00

  Move flags to precede patterns for grep and read files directly
  
  This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
  There's no reason to use cat and pipe where direct file argument works.
  

• 50761451
  by Cheng Shao at 2026-01-27T21:51:23-05:00

  ci: update darwin boot ghc to 9.10.3
  
  This patch updates darwin boot ghc to 9.10.3, along with other related
  updates, and pays off some technical debt here:
  
  - Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel.
  - Update the `niv` template.
  - Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21
    layout changes for arm64/x86_64 darwin targets.
  - Use `stdenvNoCC` to prevent nix packaged apple sdk from being used
    by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce
    the usage of system-wide command line sdk for macos.
  - When building nix derivation for boot ghc, run `configure` via the
    `arch` command so that `configure` and its subprocesses pick up the
    manually specified architecture.
  - Remove the previous horrible hack that obliterates `configure` to
    make autoconf test result in true. `configure` now properly does its
    job.
  - Remove the now obsolete configure args and post install settings
    file patching logic.
  - Use `scheme-small` for texlive to avoid build failures in certain
    unused texlive packages, especially on x86_64-darwin.
  

• 94dcd15e
  by Matthew Pickering at 2026-01-27T21:52:05-05:00

  Evaluate backtraces for "error" exceptions at the moment they are thrown
  
  See Note [Capturing the backtrace in throw] and
  Note [Hiding precise exception signature in throw] which explain the
  implementation.
  
  This commit makes `error` and `throw` behave the same with regard to
  backtraces. Previously, exceptions raised by `error` would not contain
  useful IPE backtraces.
  
  I did try and implement `error` in terms of `throw` but it started to
  involve putting diverging functions into hs-boot files, which seemed to
  risky if the compiler wouldn't be able to see if applying a function
  would diverge.
  
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383
  
  Fixes #26751
  

• ef35e3ea
  by Teo Camarasu at 2026-01-27T21:52:46-05:00

  ghc-internal: move all Data instances to Data.Data
  
  Most instances of Data are defined in GHC.Internal.Data.Data.
  Let's move all remaining instance there.
  
  This moves other modules down in the dependency hierarchy allowing for
  more parallelism, and it decreases the likelihood that we would need to
  load this heavy .hi file if we don't actually need it.
  
  Resolves #26830
  
  Metric Decrease:
      T12227
      T16875
  

• 5e0ec555
  by sheaf at 2026-01-28T06:56:38-05:00

  Add test case for #25679
  
  This commit adds the T25679 test case. The test now passes, thanks to
  commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd.
  
  Fixes #25679
  

• f1cd1611
  by sheaf at 2026-01-28T06:56:38-05:00

  Improve defaulting of representational equalities
  
  This commit makes the defaulting of representational equalities, introduced
  in 1e53277a, a little bit more robust. Now, instead of calling the eager
  unifier, it calls the full-blown constraint solver, which means that it can
  handle some subtle situations, e.g. involving functional dependencies and
  type-family injectivity annotations, such as:
  
    type family F a = r | r -> a
    type instance F Int = Bool
  
    [W] F beta ~R Bool
  

• 25edf516
  by sheaf at 2026-01-28T06:56:38-05:00

  Improve errors for unsolved representational equalities
  
  This commit adds a new field of CtLoc, CtExplanations, which allows the
  typechecker to leave some information about what it has done. For the moment,
  it is only used to improve error messages for unsolved representational
  equalities. The typechecker will now accumulate, when unifying at
  representational role:
  
    - out-of-scope newtype constructors,
    - type constructors that have nominal role in a certain argument,
    - over-saturated type constructors,
    - AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has
      nominal role in its parameters,
    - data family applications that do not reduce, potentially preventing
      newtype unwrapping.
  
  Now, instead of having to re-construct the possible errors after the fact,
  we simply consult the CtExplanations field.
  
  Additionally, this commit modifies the typechecker error messages that
  concern out-of-scope newtype constructors. The error message now depends
  on whether we have an import suggestion to provide to the user:
  
    - If we have an import suggestion for the newtype constructor,
      the message will be of the form:
  
        The data constructor MkN of the newtype N is out of scope
        Suggested fix: add 'MkN' to the import list in the import of 'M'
  
    - If we don't have any import suggestions, the message will be
      of the form:
  
        NB: The type 'N' is an opaque newtype, whose constructor is hidden
  
  Fixes #15850, #20289, #20468, #23731, #25949, #26137
  

• 4d0e6da1
  by Simon Peyton Jones at 2026-01-28T06:57:19-05:00

  Fix two bugs in short-cut constraint solving
  
  There are two main changes here:
  
  * Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver`
    The residual constraint may have some fully-solved, but
    still-there implications, and we don't want them to abort short
    cut solving!  That bug caused #26805.
  
  * In the short-cut solver, we abandon the fully-solved residual
    constraint; but we may thereby lose track of Givens that are
    needed, and either report them as redundant or prune evidence
    bindings that are in fact needed.
  
    This bug stopped the `constraints` package from compiling;
    see the trail in !15389.
  
  The second bug led me to (another) significant refactoring
  of the mechanism for tracking needed EvIds.   See the new
     Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve
  It's simpler and much less head-scratchy now.
  
  Some particulars:
  
  * An EvBindsVar now tracks NeededEvIds
  
  * We deal with NeededEvIds for an implication only when it is
    fully solved.  Much simpler!
  
  * `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than
    `TcM Bool`, so that is can plumb the needed EvIds correctly.
  
  * Remove `ic_need` and `ic_need_implic` from Implication (hooray),
    and add `ics_dm` and `ics_non_dm` to `IC_Solved`.
  
  Pure refactor
  * Shorten data constructor `CoercionHole` to `CH`, following
    general practice in GHC.
  * Rename `EvBindMap` to `EvBindsMap` for consistency
  

• 662480b7
  by Cheng Shao at 2026-01-28T06:58:00-05:00

  ci: use debian validate bindists instead of fedora release bindists in testing stage
  
  This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in
  the full-ci pipeline testing stage to use debian validate bindists
  instead of fedora release bindists, to increase pipeline level
  parallelism and allow full-ci pipelines to complete earlier. Closes #26818.
  

• 39581ec6
  by Cheng Shao at 2026-01-28T06:58:40-05:00

  ci: run perf test with -j$cores
  
  This patch makes the perf ci job compile Cabal with -j$cores to speed
  up the job.
  

• 607b287b
  by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00

  Remove `GHC.Desugar` from `base`
  
  `GHC.Desugar` was deprecated and should have been removed in GHC 9.14.
  However, the removal was forgotten, although there was a code block that
  was intended to trigger a compilation error when the GHC version in use
  was 9.14 or later. This code sadly didn’t work, because the
  `__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`.
  

• e8f5a45d
  by sterni at 2026-01-29T04:19:18-05:00

  users_guide: fix runtime error during build with Sphinx 9.1.0
  
  Appears that pathto is stricter about what it accepts now.
  Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch.
  
  Resolves #26810.
  
  Co-authored-by: Martin Weinelt <hexa@darmstadt.ccc.de>
  

• ce2d62fb
  by Jessica Clarke at 2026-01-29T19:48:51-05:00

  PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC
  
  There is no native instruction for this, and even if there were a
  register pair version we could use, the implementation here is assuming
  the values fit in a single register, and we end up only using / defining
  the low halves of the registers.
  
  Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes")
  Fixes: #23969
  

• 43d97761
  by Michael Karcher at 2026-01-29T19:49:43-05:00

  NCG for PPC: add pattern for CmmRegOff to iselExpr64
  
  Closes #26828

• aeeb4a20
  by Matthew Pickering at 2026-01-30T11:42:47-05:00

  determinism: Use deterministic map for Strings in TyLitMap
  
  When generating typeable evidence the types we need evidence for all
  cached in a TypeMap, the order terms are retrieved from a type map
  determines the order the bindings appear in the program.
  
  A TypeMap is quite diligent to use deterministic maps, apart from in the
  TyLitMap, which uses a UniqFM for storing strings, whose ordering
  depends on the Unique of the FastString.
  
  This can cause non-deterministic .hi and .o files.
  
  An unexpected side-effect is the error message but RecordDotSyntaxFail8
  changing. I looked into this with Sam and this change caused the
  constraints to be solved in a different order which results in a
  slightly different error message. I have accepted the new test, since
  the output before was non-deterministic and the new output is consistent
  with the other messages in that file.
  
  Fixes #26846
  

• 9e4d70c2
  by Andrew Lelechenko at 2026-01-30T11:43:29-05:00

  Upgrade text submodule to 2.1.4
  

• 631fa5ae
  by Recursion Ninja at 2026-01-31T22:30:11+00:00

  Decouple `L.S.H.Decls` from importing `GHC.Types.Basic`
  
  Data-types within `GHC.Types.Basic` which describe components of
  the AST are migrated to `Language.Haskell.Syntax.Basic`. Related
  function definitions are also moved.
  
  Types moved to L.H.S. because they are part of the AST:
    * TopLevelFlag
    * RuleName
  
  Types moved from L.H.S. to GHC.Hs. because they are not needed in the AST:
    * TyConFlavour
    * TypeOrData
    * NewOrData
  
  Migrated instances:
    * `Outputable` instances moved to in `GHC.Utils.Outputable`
    * `Binary` instance of `Boxity` moved to to `GHC.Utils.Binary`
    * Other `Binary` instances are orphans to be migrated later.
  
  The `OverlapMode` data-type is given a TTG extension point.
  The `OverlapFlag` data-type, which depends on `OverlapMode`,
  is updated to support `OverlapMode` with a GHC "pass" type paramerter.
  In order to avoid module import cycles, `OverlapMode` and `OverlapFlag`
  are migrated to new modules (no way around this).
  
    * Migrated `OverlapMode` to new module `Language.Haskell.Syntax.Overlap`
    * Migrated `OverlapFlag` to new module `GHC.Hs.Decls.Overlap`
  

• 9769cc03
  by Simon Hengel at 2026-02-01T04:21:03-05:00

  Update the documentation for MultiWayIf (fixes #25376)
  
  (so that it matches the implementation)
  

• 5fc9442a
  by Peter Trommler at 2026-02-01T04:21:44-05:00

  hadrian: Fix dependency generation for assembler
  
  Assembler files allow # for comments unless in column 1. A modern
  cpp for C treats those a preprocessor directives. We tell gcc that
  a .S file is assembler with cpp and not C.
  
  Fixes #26819
  

• 269c4087
  by Simon Peyton Jones at 2026-02-01T19:38:10-05:00

  Include current phase in the range for rule/unfoldings
  
  This MR fixes a bad loop in the compiler: #26826.
  
  The fix is to add (WAR2) to
     Note [What is active in the RHS of a RULE or unfolding?]
  in GHC.Core.Opt.Simplify.Utils
  

• ddf1434f
  by Vladislav Zavialov at 2026-02-01T19:38:52-05:00

  Refactor: merge HsMultilineString into HsString (#26860)
  
  Before this patch, HsLit defined two separate constructors to represent
  single-line and multi-line strings:
  
  	data HsLit x
  	  ...
  	  | HsString (XHsString x) FastString
  	  | HsMultilineString (XHsMultilineString x) FastString
  
  I found this to be an unnecessary complication and an obstacle to unifying
  HsLit with HsTyLit. Now we use HsString for both kinds of literals.
  
  One user-facing change here is `ppr (HsString st s)` behaving differently for
  single-line strings containing newlines:
  
  	x = "first line \
  	    \asdf\n\
  	    \second line"
  
  Previously, the literal was fed to `ftext` with its newlines, producing an
  ill-formed SDoc. This issue is now addressed by using `split` for both
  single-line and multi-line strings:
  
  	vcat $ map text $ split '\n' (unpackFS src)
  
  See the parser/should_fail/T26860ppr test.
  
  In addition (and unrelatedly to the main payload of this patch),
  drop the unused pmPprHsLit helper.
  

• 2b4f463c
  by Simon Peyton Jones at 2026-02-02T17:32:32+00:00

  Remove exprIsCheap from doFloatFromRhs
  
  See #26854 and Note [Float when expandable]
  
  This patch simplifies the code, by removing an extra unnecessary test.
  

• 9db7f21f
  by Brandon Chinn at 2026-02-03T09:15:10-05:00

  Refactor: make function patterns exhaustive
  
  Also added missing (==) logic for:
    * HsMultilineString
    * HsInt{8,16,32}
    * HsWord{8,16,32}
  

• aa9c5e2c
  by Hécate Kleidukos at 2026-02-03T15:58:35-05:00

  driver: Hide source paths at verbosity level 1 by default
  

• c64cca1e
  by mangoiv at 2026-02-03T15:59:29-05:00

  ExplicitLevelImports: check staging for types just like for values
  
  Previously, imported types were entirely exempted from staging checks as
  the implicit stage persistance assumed to be all imported types to be
  well staged. ExplicitLevelImports' change specification, however, does
  not do such an exemption. Thus we want to introduce such a check, just
  like we have for values.
  ExplicitLevelImports does not, however, talk about local names - from
  its perspective, we could theoretically keep treating locally introduced
  types specially - e.g. an ill-staged used in a quote would only emit a
  warning, not an error. To allow for a potential future migration away
  from such wrinkles as the staging check in notFound
  (see  Note [Out of scope might be a staging error]) we consistently do
  the strict staging check that we also do for value if ExplicitLevelImports
  is on.
  
  Closes #26098
  

• 5f0dbeb6
  by Simon Hengel at 2026-02-03T16:00:12-05:00

  Use Haddock formatting in deprecation message of `initNameCache`

• 01ecb612
  by Andreas Klebinger at 2026-02-04T09:56:25-05:00

  testsuite: Explicitly use utf-8 encoding in rts-includes linter.
  
  Not doing so caused failures on windows, as python failed to pick a
  reasonable encoding even with locale set.
  
  Fixes #26850
  

• ea0d1317
  by Zubin Duggal at 2026-02-04T09:57:06-05:00

  Bump transformers submodule to 0.6.3.0
  
  Fixes #26790
  

• cbe4300e
  by Simon Peyton Jones at 2026-02-05T04:31:04-05:00

  Fix subtle bug in GHC.Core.Utils.mkTick
  
  This patch fixes a decade-old bug in `mkTick`, which
  could generate type-incorrect code!  See the diagnosis
  in #26772.
  
  The new code is simpler and easier to understand.
  (As #26772 says, I think it could be improved further.)
  

• a193a8da
  by Simon Peyton Jones at 2026-02-05T04:31:04-05:00

  Modify a debug-trace in the Simplifier
  
  ...just to show a bit more information.
  

• b579dfdc
  by Simon Peyton Jones at 2026-02-05T04:31:04-05:00

  Fix long-standing interaction between ticks and casts
  
  The code for Note [Eliminate Identity Cases] was simply wrong when
  ticks and casts interacted.  This patch fixes the interaction.
  
  It was shown up when validating #26772, although it's not the exactly
  the bug that's reported by #26772.  Nor is it easy to reproduce, hence
  no regression test.
  

• fac0de1e
  by Cheng Shao at 2026-02-05T04:31:49-05:00

  libraries: bump Cabal submodule to 3.16.1.0
  

• 00589122
  by Cheng Shao at 2026-02-05T04:31:49-05:00

  libraries: bump deepseq submodule to 1.5.2.0
  
  Also:
  
  - Get rid of usage of deprecated `NFData` function instance in the
    compiler
  - `T21391` still relies on `NFData` function instance, add
    `-Wno-deprecations` for the time being.
  

• 84474c71
  by Cheng Shao at 2026-02-05T04:31:50-05:00

  libraries: bump directory submodule to 1.3.10.1
  

• 1a9f4662
  by Cheng Shao at 2026-02-05T04:31:50-05:00

  libraries: bump exceptions submodule to 0.10.12
  

• 2e39a340
  by Peng Fan at 2026-02-07T03:42:01-05:00

  NCG/LA64: adjust register usage to avoid src-register being clobbered
  

• 9faf1b35
  by Teo Camarasu at 2026-02-07T03:42:43-05:00

  ghc-internal: Delete unnecessary GHC.Internal.Data.Ix
  
  This module merely re-exports GHC.Internal.Ix. It was copied from
  `base` when `ghc-internal` was split, but there is no reason to have
  this now. So, let's delete it.
  
  Resolves #26848
  

• d112b440
  by Sven Tennie at 2026-02-07T10:47:56-05:00

  Add cabal.project file to generate-ci
  
  This fixes the HLS setup for our CI code generation script
  (generate-ci).
  
  The project file simply makes `generate-ci` of the cabal file
  discoverable.
  

• 5339f6f0
  by Andreas Klebinger at 2026-02-07T10:48:40-05:00

  CI: Don't collapse test results.
  
  This puts test output back into the primary test log instead of a
  subsection removing the need to expand a section to see test results.
  
  While the intention was good in practice the old behaviour mostly wastes time
  by requiring expansion of the section.
  
  Fixes #26882
  

• 0e1cd2e0
  by Evan Piro at 2026-02-08T10:35:16-08:00

  Linker.MacOS reduce dynflags import
  

• 1c79a4cd
  by Michael Alan Dorman at 2026-02-09T08:11:51-05:00

  Remove `extra_src_files` variable from `testsuite/driver/testlib.py`
  
  While reading through the test harness code, I noticed this variable
  with a TODO attached that referenced #12223.  Although that bug is
  closed, it strongly implied that this special-case variable that only
  affected a single test was expected to be removed at some point.
  
  I also looked at 3415bcaa0b1903b5e12dfaadb5b774718e406eab---where it
  was added---whose commit message suggested that it would have been
  desirable to remove it, but that there were special circumstances that
  meant it had to remain (though it doesn't elucidate what those special
  circumstances are).
  
  However, the special circumstances were mentioned as if the test was
  in a different location than is currently is, so I decided to try
  changing the test to use the standard `extra_files` mechanism, which
  works in local testing.
  
  This also seems like a reasonable time to remove the script that was
  originally used in the transition, since it doesn't really serve a
  purpose anymore.
  

• 0020e38a
  by Matthew Pickering at 2026-02-09T17:29:14-05:00

  determinism: Use a stable sort in WithHsDocIdentifiers binary instance
  
  `WithHsDocIdentifiers` is defined as
  
  ```
   71 data WithHsDocIdentifiers a pass = WithHsDocIdentifiers
   72   { hsDocString      :: !a
   73   , hsDocIdentifiers :: ![Located (IdP pass)]
   74   }
  ```
  
  This list of names is populated from `rnHsDocIdentifiers`, which calls
  `lookupGRE`, which calls `lookupOccEnv_AllNameSpaces`, which calls
  `nonDetEltsUFM` and returns the results in an order depending on
  uniques.
  
  Sorting the list with a stable sort before returning the interface makes
  the output deterministic and follows the approach taken by other fields
  in `Docs`.
  
  Fixes #26858
  

• 89898ce6
  by echoumcp1 at 2026-02-09T17:30:01-05:00

  Replace putstrln with logMsg in handleSeqHValueStatus
  
  Fixes #26549
  

• 7c52c4f9
  by John Paul Adrian Glaubitz at 2026-02-10T13:52:43-05:00

  rts: Switch prim to use modern atomic compiler builtins
  
  The __sync_*() atomic compiler builtins have been deprecated in GCC
  for a while now and also don't provide variants for 64-bit values
  such as __sync_fetch_and_add_8().
  
  Thus, replace them with the modern __atomic_*() compiler builtins and
  while we're at it, also drop the helper macro CAS_NAND() which is now
  no longer needed since we stopped using the __sync_*() compiler builtins
  altogether.
  
  Co-authored-by: Ilias Tsitsimpis <iliastsi@debian.org>
  
  Fixes #26729
  

• cf60850a
  by Recursion Ninja at 2026-02-10T13:53:27-05:00

  Decoupling L.H.S.Decls from GHC.Types.ForeignCall
  
    - Adding TTG extension point for 'CCallTarget'
    - Adding TTG extension point for 'CType'
    - Adding TTG extension point for 'Header'
    - Moving ForeignCall types that do not need extension
      to new L.H.S.Decls.Foreign module
    - Replacing 'Bool' parameters with descriptive data-types
      to increase clairty and prevent "Boolean Blindness"
  

• 11a04cbb
  by Eric Lee at 2026-02-11T09:20:46-05:00

  Derive Semigroup/Monoid for instances believed could be derived in #25871
  

• 15d9ce44
  by Eric Lee at 2026-02-11T09:20:46-05:00

  add Ghc.Data.Pair deriving
  

• c85dc170
  by Evan Piro at 2026-02-11T09:21:45-05:00

  Linker.MacOS reduce options import
  

• a541dd83
  by Chris Wendt at 2026-02-11T16:06:41-05:00

  Initialize plugins for `:set +c` in GHCi
  
  Fixes #23110.
  

• 0f5a73bc
  by Cheng Shao at 2026-02-11T16:07:27-05:00

  compiler: add Binary Text instance
  
  This patch adds `Binary` instance for strict `Text`, in preparation of
  making `Text` usable in certain GHC API use cases (e.g. haddock). This
  also introduces `text` as a direct dependency of the `ghc` package.
  

• 9e58b8a1
  by Cheng Shao at 2026-02-11T16:08:10-05:00

  ghc-toolchain: add C11 check
  
  This patch partially reverts commit
  b8307eab80c5809df5405d76c822bf86877f5960 that removed C99 check in
  autoconf/ghc-toolchain. Now we:
  
  - No longer re-implement `FP_SET_CFLAGS_C11` similar to
    `FP_SET_CFLAGS_C99` in the past, since autoconf doesn't provide a
    convenient `AC_PROG_CC_C11` function. ghc-toolchain will handle it
    anyway.
  - The Cmm CPP C99 check is relanded and repurposed for C11.
  - The C99 logic in ghc-toolchain is relanded and repurposed for C11.
  - The C99 check in Stg.h is corrected to check for C11. The obsolete
    _ISOC99_SOURCE trick is dropped.
  - Usages of `-std=gnu99` in the testsuite are corrected to use
    `-std=gnu11`.
  
  Closes #26908.
  

• 4df0adf6
  by Simon Peyton Jones at 2026-02-11T21:50:13-05:00

  Simplify the treatment of static forms
  
  This MR implements GHC proposal 732: simplify static forms,
     https://github.com/ghc-proposals/ghc-proposals/pull/732
  thereby addressing #26556.
  
  See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable
  
  The main changes are:
  
  * There is a new, simple rule for (static e), namely that the free
    term variables of `e` must be bound at top level.  The check is
    done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr`
  
  * That in turn substantially simplifies the info that the typechecker
    carries around in its type environment.  Hooray.
  
  * The desugarer emits static bindings to top level directly; see the
    `HsStatic` case of `dsExpr`.
  
  * There is no longer any special static-related magic in the FloatOut
    pass.  And the main Simplifier pipeline no longer needs a special case
    to run FloatOut even with -O0.  Hooray.
  
  All this forced an unexpected change to the pattern match checker. It
  recursively invokes the main Hs desugarer when it wants to take a look
  at a term to spot some special cases (notably constructor applications).
  We don't want to emit any nested (static e) bindings to top level a
  second time!  Yikes.
  
  That forced a modest refactor in GHC.HsToCore.Pmc:
  
  * The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says
    "I'm desugaring just for pattern-match checking purposes".
  
  * When that flag is set we don't emit static binds.
  
  That in turn forces a cascade of refactoring, but the net effect is an
  improvement; less risk of duplicated (even exponential?) work.
  
  See Note [Desugaring HsExpr during pattern-match checking].
  
  10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304.
  
  Metric Decrease:
      T15304
  

• 7922f728
  by Teo Camarasu at 2026-02-11T21:50:58-05:00

  ghc-internal: avoid depending on GHC.Internal.Exts
  
  This module is mostly just re-exports. It made sense as a user-facing
  module, but there's no good reason ghc-internal modules should depend on
  it and doing so linearises the module graph
  
  - move considerAccessible to GHC.Internal.Magic
  
  Previously it lived in GHC.Internal.Exts, but it really deserves to live
  along with the other magic function, which are already re-exported from .Exts
  
  - move maxTupleSize to GHC.Internal.Tuple
  
  This previously lived in GHC.Internal.Exts but a comment already said it
  should be moved to .Tuple
  
  Resolves #26832
  

• b6a4a29b
  by Eric Lee at 2026-02-11T21:51:55-05:00

  Remove unused Semigroup imports to fix GHC 9.14 bootstrapping
  

• 99d8c146
  by Simon Peyton Jones at 2026-02-12T17:36:59+00:00

  Fix subtle bug in cast worker/wrapper
  
  See (CWw4) in Note [Cast worker/wrapper].
  
  The true payload is in the change to the definition of
     GHC.Types.Id.Info.hasInlineUnfolding
  Everthing else is just documentation.
  
  There is a 2% compile time decrease for T13056;
  I'll take the win!
  
  Metric Decrease:
      T13056
  

• 530e8e58
  by Simon Peyton Jones at 2026-02-12T20:17:23-05:00

  Add regression tests for four StaticPtr bugs
  
  Tickets #26545, #24464, #24773, #16981 are all solved by the
  recently-landed MR
  
      commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c
      Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
      Date:   Mon Oct 20 23:07:20 2025 +0100
  
      Simplify the treatment of static forms
  
  This MR just adds regression tests for them.
  

• 4157160f
  by Cheng Shao at 2026-02-13T06:27:04-05:00

  ci: remove unused hlint-ghc-and-base job definition
  
  This patch removes the unused `hlint-ghc-and-base` job definition,
  it's never run since !9806. Note that hadrian lint rules still work
  locally, so anyone that wishes to run hlint on the codebase can
  continue to do so in their local worktree.
  

• 039f1977
  by Cheng Shao at 2026-02-13T06:27:47-05:00

  wasm: use import.meta.main for proper distinction of nodejs main modules
  
  This patch uses `import.meta.main` for proper distinction of nodejs
  main modules, especially when the main module might be installed as a
  symlink. Fixes #26916.
  

• 14f485ee
  by ARATA Mizuki at 2026-02-17T09:09:24+09:00

  Support more x86 extensions: AVX-512 {BW,DQ,VL} and GFNI
  
  Also, mark AVX-512 ER and PF as deprecated.
  
  AVX-512 instructions can be used for certain 64-bit integer vector operations.
  
  GFNI can be used to implement bitReverse (currently not used by NCG, but LLVM may use it).
  
  Closes #26406
  Addresses #26509
  

• 016f79d5
  by fendor at 2026-02-17T09:16:16-05:00

  Hide implementation details from base exception stack traces
  
  Ensure we hide the implementation details of the exception throwing mechanisms:
  
  * `undefined`
  * `throwSTM`
  * `throw`
  * `throwIO`
  * `error`
  
  The `HasCallStackBacktrace` should always have a length of exactly 1,
  not showing internal implementation details in the stack trace, as these
  are vastly distracting to end users.
  
  CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387)
  

• 4f2840f2
  by Brian J. Cardiff at 2026-02-17T17:04:08-05:00

  configure: Accept happy-2.2
  
  In Jan 2026 happy-2.2 was released. The most sensible change is https://github.com/haskell/happy/issues/335 which didn't trigger in a fresh build
  

• 10b4d364
  by Duncan Coutts at 2026-02-17T17:04:52-05:00

  Fix errors in the documentation of the eventlog STOP_THREAD status codes
  
  Fix the code for BlockedOnMsgThrowTo.
  
  Document all the known historical warts.
  
  Fixes issue #26867
  

• c5e15b8b
  by Phil de Joux at 2026-02-18T05:07:36-05:00

  haddock: use snippets for all list examples
  
  - generate snippet output for docs
  - reduce font size to better fit snippets
  - Use only directive to guard html snippets
  - Add latex snippets for lists
  

• d388bac1
  by Phil de Joux at 2026-02-18T05:07:36-05:00

  haddock: Place the snippet input and output together
  
  - Put the output seemingly inside the example box
  

• 016fa306
  by Samuel Thibault at 2026-02-18T05:08:35-05:00

  Fix linking against libm by moving the -lm option
  
  For those systems that need -lm for getting math functions, this is
  currently added on the link line very early, before the object files being
  linked together. Newer toolchains enable --as-needed by default, which means
  -lm is ignored at that point because no object requires a math function
  yet. With such toolchains, we thus have to add -lm after the objects, so the
  linker actually includes libm in the link.
  

• 68bd0805
  by Teo Camarasu at 2026-02-18T05:09:19-05:00

  ghc-internal:  Move GHC.Internal.Data.Bool to base
  
  This is a tiny module that only defines bool :: Bool -> a -> a -> a. We can just move this to base and delete it from ghc-internal. If we want this functionality there we can just use a case statement or if-then expression.
  
  Resolves 26865
  

• 4c40df3d
  by fendor at 2026-02-20T10:24:48-05:00

  Add optional `SrcLoc` to `StackAnnotation` class
  
  `StackAnnotation`s give access to an optional `SrcLoc` field that
  user-added stack annotations can use to provide better backtraces in both error
  messages and when decoding the callstack.
  
  We update builtin stack annotations such as `StringAnnotation` and
  `ShowAnnotation` to also capture the `SrcLoc` of the current `CallStack`
  to improve backtraces by default (if stack annotations are used).
  
  This change is backwards compatible with GHC 9.14.1.
  

• fd9aaa28
  by Simon Hengel at 2026-02-20T10:25:33-05:00

  docs: Fix grammar in explicit_namespaces.rst
  

• 44354255
  by Vo Minh Thu at 2026-02-20T18:53:06-05:00

  GHCi: add a :version command.
  
  This looks like:
  
      ghci> :version
      GHCi, version 9.11.20240322
  
  This closes #24576.
  
  Co-Author: Markus Läll <markus.l2ll@gmail.com>
  

• eab3dbba
  by Andreas Klebinger at 2026-02-20T18:53:51-05:00

  hadrian/build-cabal: Better respect and utilize -j
  
  * We now respect -j<n> for the cabal invocation to build hadrian rather
    than hardcoding -j
  * We use the --semaphore flag to ensure cabal/ghc build the hadrian
    executable in parallel using the -jsem mechanism.
  
  Saves 10-15s on fresh builds for me.
  
  Fixes #26876
  

• 17839248
  by Teo Camarasu at 2026-02-24T08:36:03-05:00

  ghc-internal: avoid depending on GHC.Internal.Control.Monad.Fix
  
  This module contains the definition of MonadFix, since we want an
  instance for IO, that instance requires a lot of machinery and we want
  to avoid an orphan instance, this will naturally be quite high up in the
  dependency graph.
  
  So we want to avoid other modules depending on it as far as possible.
  
  On Windows, the IO manager depends on the RTSFlags type, which
  transtively depends on MonadFix. We refactor things to avoid this
  dependency, which would have caused a regression.
  
  Resolves #26875
  
  Metric Decrease:
      T12227
  

• fa88d09a
  by Wolfgang Jeltsch at 2026-02-24T08:36:47-05:00

  Refine the imports of `System.IO.OS`
  
  Commit 68bd08055594b8cbf6148a72d108786deb6c12a1 replaced the
  `GHC.Internal.Data.Bool` import by a `GHC.Internal.Base` import.
  However, while the `GHC.Internal.Data.Bool` import was conditional and
  partial, the `GHC.Internal.Base` import is unconditional and total. As a
  result, the import list is not tuned to import only the necessary bits
  anymore, and furthermore GHC emits a lot of warnings about redundant
  imports.
  
  This commit makes the `GHC.Internal.Base` import conditional and partial
  in the same way that the `GHC.Internal.Data.Bool` import was.
  

• c951fef1
  by Cheng Shao at 2026-02-25T20:58:28+00:00

  wasm: add /assets endpoint to serve user-specified assets
  
  This patch adds an `/assets` endpoint to the wasm dyld http server, so
  that users can also fetch assets from the same host with sensible
  default MIME types, without needing a separate http server for assets
  that also introduces CORS headaches:
  
  - A `-fghci-browser-assets-dir` driver flag is added to specify the
    assets root directory (defaults to `$PWD`)
  - The dyld http server fetches `mime-db` on demand and uses it as
    source of truth for mime types.
  
  Closes #26951.
  

• dde22f97
  by Sylvain Henry at 2026-02-26T13:14:03-05:00

  Fix -fcheck-prim-bounds for non constant args (#26958)
  
  Previously we were only checking bounds for constant (literal)
  arguments!
  
  I've refactored the code to simplify the generation of out-of-line Cmm
  code for the primop composed of some inline code + some call to an
  external Cmm function.
  

• bd3eba86
  by Vladislav Zavialov at 2026-02-27T05:48:01-05:00

  Check for negative type literals in the type checker (#26861)
  
  GHC disallows negative type literals (e.g., -1), as tested by T8306 and
  T8412. This check is currently performed in the renamer:
  
    rnHsTyLit tyLit@(HsNumTy x i) = do
      when (i < 0) $
        addErr $ TcRnNegativeNumTypeLiteral tyLit
  
  However, this check can be bypassed using RequiredTypeArguments
  (see the new test case T26861). Prior to this patch, such programs
  caused the compiler to hang instead of reporting a proper error.
  This patch addresses the issue by adding an equivalent check in
  the type checker, namely in tcHsType.
  
  The diff is deliberately minimal to facilitate backporting. A more
  comprehensive rework of HsTyLit is planned for a separate commit.
  

• faf14e0c
  by Vladislav Zavialov at 2026-02-27T05:48:45-05:00

  Consistent pretty-printing of HsString, HsIsString, HsStrTy
  
  Factor out a helper to pretty-print string literals, thus fixing newline
  handling for overloaded string literals and type literals.
  
  Test cases: T26860ppr T26860ppr_overloaded T26860ppr_tylit
  
  Follow up to ddf1434ff9bb08cfef3c93f23de6b83ec698aa27
  

• f108a972
  by Arnaud Spiwack at 2026-02-27T12:53:01-05:00

  Make list comprehension completely non-linear
  
  Fixes #25081
  
  From the note:
  
  The usefulness of list comprehension in conjunction with linear types is dubious.
  After all, statements are made to be run many times, for instance in
  
  ```haskell
  [u | y <- [0,1], stmts]
  ```
  
  both `u` and `stmts` are going to be run several times.
  
  In principle, though, there are some position in a monad comprehension
  expression which could be considered linear. We could try and make it so that
  these positions are considered linear by the typechecker, but in practice the
  desugarer doesn't take enough care to ensure that these are indeed desugared to
  linear sites. We tried in the past, and it turned out that we'd miss a
  desugaring corner case (#25772).
  
  Until there's a demand for this very specific improvement, let's instead be
  conservative, and consider list comprehension to be completely non-linear.
  

• ae799cab
  by Simon Jakobi at 2026-02-27T12:53:54-05:00

  PmAltConSet: Use Data.Set instead of Data.Map
  
  ...to store `PmLit`s.
  
  The Map was only used to map keys to themselves.
  Changing the Map to a Set saves a Word of memory per entry.
  
  Resolves #26756.
  

• dcd7819c
  by Vladislav Zavialov at 2026-02-27T18:46:03-05:00

  Drop HsTyLit in favor of HsLit (#26862, #25121)
  
  This patch is a small step towards unification of HsExpr and HsType,
  taking care of literals (HsLit) and type literals (HsTyLit).
  
  Additionally, it improves error messages for unsupported type literals,
  such as unboxed or fractional literals (test cases: T26862, T26862_th).
  
  Changes to the AST:
  
  * Use HsLit           where HsTyLit   was previously used
  * Use HsChar          where HsCharTy  was previously used
  * Use HsString        where HsStrTy   was previously used
  * Use HsNatural (NEW) where HsNumTy   was previously used
  * Use HsDouble  (NEW) to represent unsupported fractional type literals
  
  Changes to logic:
  
  * Parse unboxed and fractional type literals (to be rejected later)
  
  * Drop the check for negative literals in the renamer (rnHsTyLit)
    in favor of checking in the type checker (tc_hs_lit_ty)
  
  * Check for invalid type literals in TH (repTyLit) and report
    unrepresentable literals with ThUnsupportedTyLit
  
  * Allow negative type literals in TH (numTyLit). This is fine as
    these will be taken care of at splice time (test case: T8306_th)
  

• c927954f
  by Vladislav Zavialov at 2026-02-27T18:46:50-05:00

  Increase test coverage of diagnostics
  
  Add test cases for the previously untested diagnostics:
    [GHC-01239] PsErrIfInFunAppExpr
    [GHC-04807] PsErrProcInFunAppExpr
    [GHC-08195] PsErrInvalidRecordCon
    [GHC-16863] PsErrUnsupportedBoxedSumPat
    [GHC-18910] PsErrSemiColonsInCondCmd
    [GHC-24737] PsErrInvalidWhereBindInPatSynDecl
    [GHC-25037] PsErrCaseInFunAppExpr
    [GHC-25078] PsErrPrecedenceOutOfRange
    [GHC-28021] PsErrRecordSyntaxInPatSynDecl
    [GHC-35827] TcRnNonOverloadedSpecialisePragma
    [GHC-40845] PsErrUnpackDataCon
    [GHC-45106] PsErrInvalidInfixHole
    [GHC-50396] PsErrInvalidRuleActivationMarker
    [GHC-63930] MultiWayIfWithoutAlts
    [GHC-65536] PsErrNoSingleWhereBindInPatSynDecl
    [GHC-67630] PsErrMDoInFunAppExpr
    [GHC-70526] PsErrLetCmdInFunAppCmd
    [GHC-77808] PsErrDoCmdInFunAppCmd
    [GHC-86934] ClassPE
    [GHC-90355] PsErrLetInFunAppExpr
    [GHC-91745] CasesExprWithoutAlts
    [GHC-92971] PsErrCaseCmdInFunAppCmd
    [GHC-95644] PsErrBangPatWithoutSpace
    [GHC-97005] PsErrIfCmdInFunAppCmd
  
  Remove unused error constructors:
    [GHC-44524] PsErrExpectedHyphen
    [GHC-91382] TcRnIllegalKindSignature
  

• 3a9470fd
  by Torsten Schmits at 2026-02-27T18:47:34-05:00

  Avoid expensive computation for debug logging in `mergeDatabases` when log level is low
  
  This computed and traversed a set intersection for every single
  dependency unconditionally.
  

• ea4c2cbd
  by Brandon Chinn at 2026-02-27T16:22:38-08:00

  Implement QualifiedStrings (#26503)
  
  See Note [Implementation of QualifiedStrings]
  

• 08bc245b
  by sheaf at 2026-03-01T11:11:54-05:00

  Clean up join points, casts & ticks
  
  This commit shores up the logic dealing with casts and ticks occurring
  in between a join point binding and a jump.
  
  Fixes #26642 #26929 #26693
  Makes progress on #14610 #26157 #26422
  
  Changes:
  
    - Remove 'GHC.Types.Tickish.TickishScoping' in favour of simpler
      predicates 'tickishHasNoScope'/'tickishHasSoftScope', as things were
      before commit 993975d3. This makes the code easier to read and
      document (fewer indirections).
  
    - Introduce 'canCollectArgsThroughTick' for consistent handling of
      ticks around PrimOps and other 'Id's that cannot be eta-reduced.
      See overhauled Note [Ticks and mandatory eta expansion].
  
    - New Note [JoinId vs TailCallInfo] in GHC.Core.SimpleOpt that explains
      robustness of JoinId vs fragility of TailCallInfo.
  
    - Allow casts/non-soft-scoped ticks to occur in between a join point
      binder and a jump, but only in Core Prep.
      See Note [Join points, casts, and ticks] and
      Note [Join points, casts, and ticks... in Core Prep]
      in GHC.Core.Opt.Simplify.Iteration.
  
      Also update Core Lint to account for this.
      See Note [Linting join points with casts or ticks] in GHC.Core.Lint.
  
    - Update 'GHC.Core.Utils.mergeCaseAlts' to avoid pushing a cast in
      between a join point binding and its jumps. This fixes #26642.
      See the new (MC5) and (MC6) in Note [Merge Nested Cases].
  
    - Update float out to properly handle source note ticks. They are now
      properly floated out instead of being discarded.
      This increases the number of ticks in certain tests with -g.
  
  Test cases: T26642 and TrickyJoins.
  
  Metric increase due to more source note ticks with -g:
  
  -------------------------
  Metric Increase:
      libdir
      size_hello_artifact
      size_hello_unicode
  -------------------------
  

• 476c4cdf
  by Sean D. Gillespie at 2026-03-02T10:14:37-05:00

  Add SIMD absolute value on x86 and LLVM
  
  On x86, absolute value of 32 bits or less is implemented with
  PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback
  for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL,
  with fallbacks for SSE4.2 and SSE2.
  
  There is no dedicated instruction for floating point absolute value on
  x86, so it is simulated using bitwise AND.
  
  Absolute value for signed integers and floats are implemented by the
  "llvm.abs/llvm.fabs" standard library intrinsics. This implementation
  uses MachOps constructors, unlike non-vector floating point absolute
  value, which uses CallishMachOps.
  

• 709448c0
  by Sean D. Gillespie at 2026-03-02T10:14:46-05:00

  Add SIMD floating point square root
  
  On x86, this is implemented with the SQRTPS and SQRTPD instructions. On
  LLVM, it uses the sqrt library intrinstic.
  

• 0deadf66
  by Sean D. Gillespie at 2026-03-02T10:14:47-05:00

  Improve error message for SIMD on aarch64
  
  When encountering vector literals on aarch64, previously it would
  throw:
  
      <no location info>: error:
          panic! (the 'impossible' happened)
        GHC version 9.15.20251219:
              getRegister' (CmmLit:CmmVec):
  
  Now it is more consistent with the other vector operations:
  
      <no location info>: error:
          sorry! (unimplemented feature or known bug)
        GHC version 9.15.20251219:
              SIMD operations on AArch64 currently require the LLVM backend
  

• 7d64031b
  by Vladislav Zavialov at 2026-03-03T11:09:28-05:00

  Replace maybeAddSpace with spaceIfSingleQuote
  
  Simplify pretty-printing of HsTypes by using spaceIfSingleQuote.
  This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote
  helper function.
  
  Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da
  

• 598db847
  by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00

  Correct `hIsReadable` and `hIsWritable` for duplex handles
  
  This contribution implements CLC proposal #371. It changes `hIsReadable`
  and `hIsWritable` such that they always throw a respective exception
  when encountering a closed or semi-closed handle, not just in the case
  of a file handle.
  

• b90201e5
  by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00

  Document `SemiClosedHandle`
  

• c9df72b5
  by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00

  Tell users what “semi-closed” means for duplex handles
  

• a8aa1868
  by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00

  Fix determinism of linker arguments
  
  The switch from Data.Map to UniqMap in 3b5be05ac29 introduced
  non-determinism in the order of packages passed to the linker.
  
  This resulted in non-reproducible builds where the DT_NEEDED entries in
  dynamic libraries were ordered differently across builds.
  
  Fix the regression by explicitly sorting the package list derived from
  UniqMap.
  
  Fixes #26838
  

• 9b64ad3a
  by Matthew Pickering at 2026-03-06T06:27:16-05:00

  determinism: Use a deterministic renaming when writing bytecode files
  
  Now when writing the bytecode file, a counter and substitution are used
  to provide deterministic keys to local variables (rather than relying on
  uniques). This change ensures that `.gbc` are produced
  deterministically.
  
  Fixes #26499
  

• d29800e0
  by Teo Camarasu at 2026-03-06T06:28:46-05:00

  ghc-internal: delete Version hs-boot loop
  
  Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module.
  
  Resolves #26940
  

• ad25af90
  by Sylvain Henry at 2026-03-06T06:30:33-05:00

  Linker: implement support for COMMON symbols (#6107)
  
  Add some support for COMMON symbols. We don't support common symbols
  having different sizes where the larger one is allocated after the
  smaller one. The linker will fail with an appropriate error message if
  it happens.
  

• 3b59f158
  by Cheng Shao at 2026-03-06T06:31:16-05:00

  compiler: fix redundant import of GHC.Hs.Lit
  
  This patch removes a redundant import of `GHC.Hs.Lit` which causes a
  ghc build failure with validate flavours when bootstrapping from 9.14.
  Fixes #26972.
  

• 148d36f3
  by Cheng Shao at 2026-03-06T06:32:01-05:00

  compiler: avoid unneeded traversals in GHC.Unit.State
  
  Following !15591, this patch avoids unneeded traversals in
  `reportCycles`/`reportUnusable` when log verbosity is below given
  threshold. Also applies `logVerbAtLeast` when appropriate.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 7e31367c
  by Cheng Shao at 2026-03-06T06:32:46-05:00

  ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool
  
  This patch fixes redundant import in
  `GHC.Internal.Event.Windows.ManagedThreadPool` that causes a
  compilation error when building windows target with validate flavours
  and bootstrapping from 9.14. Fixes #26976.
  

• fc8b8e27
  by sheaf at 2026-03-06T06:33:28-05:00

  System.Info.fullCompilerVersion: add 'since' annot
  
  Fixes #26973

• c8238375
  by Sylvain Henry at 2026-03-06T06:34:23-05:00

  Hadrian: deprecate --bignum and automatically enable +native_bignum for JS
  
  Deprecate --bignum=... to select the bignum backend. It's only used to
  select the native backend, and this can be done with the +native_bignum
  flavour transformer.
  
  Additionally, we automatically enable +native_bignum for the JS target
  because the GMP backend isn't supported.
  

• a3ac7074
  by Sylvain Henry at 2026-03-06T06:35:17-05:00

  JS: fix putEnum/fromEnum (#24593)
  
  Don't go through Word16 when serializing Enums.
  

• 0b36e96c
  by Andreas Klebinger at 2026-03-06T06:35:58-05:00

  Docs: Document -fworker-wrapper-cbv default setting.
  
  Fixes #26841
  

• eca445e7
  by mangoiv at 2026-03-07T05:02:36-05:00

  drop deb9/10 from CI, add deb13
  
  debian 9 and 10 are end of life, hence we drop them
  from our CI, but we do add debian 13. Jobs that were
  previously run on 9 and 10 run on 13, too, jobs that
  were run on 10, are run on 11 now. Jobs that were
  previously run on debian 12 are run on debian 13 now.
  This MR also updates hadrian's bootstrap plans for that
  reason.
  
  Metric Decrease:
      T9872d
  

• 12f8b829
  by Luite Stegeman at 2026-03-07T05:03:33-05:00

  Fix GHC.Internal.Prim haddock
  
  Haddock used to parse Haskell source to generate documentation,
  but switched to using interface files instead. This broke documentation
  of the GHC.Internal.Prim module, since it's a wired-in interface that
  didn't provide a document structure.
  
  This patch adds the missing document structure and updates genprimopcode
  to make the section headers and descriptions available.
  
  fixes #26954
  

• f87e5e57
  by Luite Stegeman at 2026-03-07T05:03:33-05:00

  Remove obsolete --make-haskell-source from genprimopcode
  
  Now that haddock uses the wired-in interface for GHC.Internal.Prim,
  the generated Haskell source file is no longer needed. Remove the
  --make-haskell-source code generator from genprimopcode and replace
  the generated GHC/Internal/Prim.hs with a minimal static source file.
  

• 4a7ddc7b
  by Sylvain Henry at 2026-03-07T05:04:59-05:00

  JS: fix linking of exposed but non-preload units (#24886)
  
  Units exposed in the unit database but not explicitly passed on the
  command-line were not considered by the JS linker. This isn't an issue
  for cabal which passes every unit explicitly but it is an issue when
  using GHC directly (cf T24886 test).
  

• 689aafcd
  by mangoiv at 2026-03-07T05:05:52-05:00

  testsuite: double foundation timeout multiplier
  
  The runtime timeout in the foundation test was regularly hit by code
  generated by the wasm backend - we increase the timout since the high
  runtime is expected on the wasm backend for this rather complex test.
  
  Resolves #26938
  

• a46a1bb1
  by Cheng Shao at 2026-03-09T04:50:30-04:00

  compiler: add myCapabilityExpr to GHC.Cmm.Utils
  
  This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is
  computed from `BaseReg`. It's convenient for codegen logic where one
  needs to pass the current Capability's pointer.
  

• 4afc65b1
  by Cheng Shao at 2026-03-09T04:50:30-04:00

  compiler: lower tryPutMVar# into a ccall directly
  
  This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it
  completely and making the compiler lower `tryPutMVar#` into a ccall to
  `performTryPutMVar` directly, without landing into an intermediate C
  or Cmm function. `performTryPutMVar` is promoted to a public RTS
  function with default visibility, and the compiler lowering logic
  takes into account the C ABI of `performTryPutMVar` and converts from
  C Bool to primop's `Int#` result properly.
  

• 9e3d6a58
  by Simon Hengel at 2026-03-09T04:51:15-04:00

  Don't use #line in haddocks
  
  This confuses the parser.  Haddock output is unaffected by this change.
  (read: this still produces the same documentation)
  

• f4e8fec2
  by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00

  Remove in-package dependencies on `GHC.Internal.System.IO`
  
  This contribution eliminates all dependencies on
  `GHC.Internal.System.IO` from within `ghc-internal`. It comprises the
  following changes:
  
    * Make `GHC.Internal.Fingerprint` independent of I/O support
    * Tighten the dependencies of `GHC.Internal.Data.Version`
    * Tighten the dependencies of `GHC.Internal.TH.Monad`
    * Tighten the dependencies of `GHCi.Helpers`
    * Move some code that needs `System.IO` to `template-haskell`
    * Move the `GHC.ResponseFile` implementation into `base`
    * Move the `System.Exit` implementation into `base`
    * Move the `System.IO.OS` implementation into `base`
  
  Metric Decrease:
      size_hello_artifact
      size_hello_artifact_gzip
      size_hello_unicode
      size_hello_unicode_gzip
  

• 91df4c82
  by Sylvain Henry at 2026-03-09T04:53:20-04:00

  T18832: fix Windows CI failure by dropping removeDirectoryRecursive
  
  On Windows, open file handles prevent deletion. After killThread, the
  closer thread may not have called hClose yet, causing removeDirectoryRecursive
  to fail with "permission denied". The test harness cleans up the run
  directory anyway, so the call is redundant.
  

• d7fe9671
  by Cheng Shao at 2026-03-09T04:54:04-04:00

  compiler: fix redundant import in GHC.StgToJS.Object
  
  This patch fixes a redundant import in GHC.StgToJS.Object that causes
  a build failure when compiling head from 9.14 with validate flavours.
  Fixes #26991.
  

• 0bfd29c3
  by Cheng Shao at 2026-03-09T04:54:46-04:00

  wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports
  
  This patch fixes a wasm ghci error when loading modules with JSFFI
  exports; the `backendValidityOfCExport` check in `tcCheckFEType`
  should only makes sense and should be performed when not checking the
  JavaScript calling convention; otherwise, when the calling convention
  is JavaScript, the codegen logic should be trusted to backends that
  actually make use of it. Fixes #26998.
  

• e659610c
  by Duncan Coutts at 2026-03-09T12:08:35-04:00

  Apply NOINLINE pragmas to generated Typeable bindings
  
  For context, see the existing Note [Grand plan for Typeable]
  and the Note [NOINLINE on generated Typeable bindings] added in the
  subsequent commit.
  
  This is about reducing the number of exported top level names and
  unfoldings, which reduces interface file sizes and reduces the number of
  global/dynamic linker symbols.
  
  Also accept the changed test output and metric decreases.
  
  Tests that record the phase output for type checking or for simplifier
  end up with different output: the generated bindings now have an
  Inline [~] annotation, and many top level names are now local rather
  than module-prefixed for export.
  
  Also accept the numerous metric decreases in compile_time/bytes
  allocated, and a few in compile_time/max_bytes_used.
  
  There's also one instance of a decrease in runtime/max_bytes_used but
  it's a ghci-way test and so presumably the reason is that it loads
  smaller .hi files and/or links fewer symbols.
  
  -------------------------
  Metric Decrease:
      CoOpt_Singletons
      MultiLayerModulesTH_OneShot
      MultilineStringsPerf
      T10421
      T10547
      T12150
      T12227
      T12234
      T12425
      T13035
      T13056
      T13253
      T13253-spj
      T15304
      T15703
      T16875
      T17836b
      T17977b
      T18140
      T18223
      T18282
      T18304
      T18698a
      T18698b
      T18730
      T18923
      T20049
      T21839c
      T24471
      T24582
      T24984
      T3064
      T4029
      T5030
      T5642
      T5837
      T6048
      T9020
      T9198
      T9961
      TcPlugin_RewritePerf
      WWRec
      hard_hole_fits
      mhu-perf
  -------------------------
  

• 67df5161
  by Duncan Coutts at 2026-03-09T12:08:35-04:00

  Add documentation Note [NOINLINE on generated Typeable bindings]
  
  and refer to it from the code and existing documentation.
  

• c4ad6167
  by Duncan Coutts at 2026-03-09T12:08:35-04:00

  Switch existing note to "named wrinkle" style, (GPT1)..(GPT7)
  
  GPT = Grand plan for Typeable
  

• dc84f8e2
  by Cheng Shao at 2026-03-09T12:09:21-04:00

  ci: only build deb13 for validate pipeline aarch64-linux jobs
  
  This patch drops the redundant aarch64-linux deb12 job from validate pipelines
  and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004.
  

• 23a50772
  by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00

  chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad
  
  Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
  GHC.Internal.TH.Monad and delete the Quote module.
  
  Update submodule template-haskell-quasiquoter to use the merged
  upstream version that imports from the correct module.
  
  Co-authored-by: Cursor <cursoragent@cursor.com>
  

• a2bb6fc3
  by Simon Jakobi at 2026-03-10T14:12:23-04:00

  Add regression test for #16122
  

• 604e1180
  by Cheng Shao at 2026-03-11T15:00:42-04:00

  hadrian: remove the broken bench flavour
  
  This patch removes the bench flavour from hadrian which has been
  broken for years and not used for actual benchmarking (for which
  `perf`/`release` is used instead). Closes #26825.
  

• c3e64915
  by Simon Jakobi at 2026-03-11T15:01:31-04:00

  Add regression test for #18186
  
  The original TypeInType language extension is replaced with
  DataKinds+PolyKinds for compatibility.
  
  Closes #18186.
  

• 664996c7
  by Andreas Klebinger at 2026-03-11T15:02:16-04:00

  Bump nofib submodule.
  
  We accrued a number of nofib fixes we want to have here.
  

• 517cf64e
  by Simon Jakobi at 2026-03-11T15:03:03-04:00

  Add regression test for #15907
  
  Closes #15907.
  

• fff362cf
  by Simon Jakobi at 2026-03-11T15:03:49-04:00

  Ensure T14272 is run in optasm way
  
  Closes #16539.
  

• ec81ec2c
  by Simon Jakobi at 2026-03-11T15:03:49-04:00

  Add regression test for #24632
  
  Closes #24632.
  

• cefec47b
  by Simon Jakobi at 2026-03-11T15:03:50-04:00

  Fix module name of T9675: T6975 -> T9675
  

• d3690ae8
  by Andreas Klebinger at 2026-03-11T15:04:31-04:00

  User guide: Clarify phase control on INLINEABLE[foo] pragmas.
  
  Fixes #26851
  

• e7054934
  by Simon Jakobi at 2026-03-11T15:05:16-04:00

  Add regression test for #12694
  
  Closes #12694.
  

• 4756d9f6
  by Simon Jakobi at 2026-03-11T15:05:16-04:00

  Add regression test for #16275
  
  Closes #16275.
  

• 34b7e2c1
  by Simon Jakobi at 2026-03-11T15:05:16-04:00

  Add regression test for #14908
  
  Closes #14908.
  

• 4243db3d
  by Simon Jakobi at 2026-03-11T15:05:16-04:00

  Add regression test for #14151
  
  Closes #14151.
  

• 0e9f1453
  by Simon Jakobi at 2026-03-11T15:05:16-04:00

  Add regression test for #12640
  
  Closes #12640.
  

• ae606c7f
  by Simon Jakobi at 2026-03-11T15:05:16-04:00

  Add regression test for #15588
  
  Closes #15588.
  

• 5a38ce4e
  by Simon Jakobi at 2026-03-11T15:05:16-04:00

  Add regression test for #9445
  
  Closes #9445.
  

• d054b467
  by Cheng Shao at 2026-03-11T15:05:59-04:00

  compiler: implement string interning logic for BCONPtrFS
  
  This patch adds a `FastStringEnv`-based cache of `MallocStrings`
  requests to `Interp`, so that when we load bytecode with many
  breakpoints that share the same module names & unit ids, we reuse the
  allocated remote pointers instead of issuing duplicte `MallocStrings`
  requests and bloating the C heap. Closes #26995.
  

• b85a0293
  by Simon Jakobi at 2026-03-11T15:06:41-04:00

  Add perf test for #1216
  
  Closes #1216.
  

• cd7f7420
  by Sylvain Henry at 2026-03-11T15:07:58-04:00

  JS: check that tuple constructors are linked (#23709)
  
  Test js-mk_tup was failing before because tuple constructors weren't
  linked in. It's no longer an issue after the linker fixes.
  

• d57f01a4
  by Matthew Pickering at 2026-03-11T15:08:40-04:00

  testsuite: Add test for foreign import prim with unboxed tuple return
  
  This commit just adds a test that foreign import prim works with unboxed
  sums.
  

• 23d111ce
  by Matthew Pickering at 2026-03-11T15:08:41-04:00

  Return a valid pointer in advanceStackFrameLocationzh
  
  When there is no next stack chunk, `advanceStackFrameLocationzh` used to
  return NULL in the pointer-typed StackSnapshot# result slot.
  
  Even though the caller treats that case as "no next frame", the result is
  still materialized in a GC-visible pointer slot. If a GC observes the raw
  NULL there, stack decoding can crash.
  
  Fix this by ensuring the dead pointer slot contains a valid closure
  pointer. Also make the optional result explicit by returning an unboxed
  sum instead of a tuple with a separate tag.
  
  Fixes #27009
  

• 4c58a3ae
  by Cheng Shao at 2026-03-11T15:09:22-04:00

  hadrian: build profiled dynamic objects with -dynamic-too
  
  This patch enables hadrian to build profiled dynamic objects with
  `-dynamic-too`, addressing a build parallelism bottleneck in release
  pipelines. Closes #27010.
  

• 870243e4
  by Zubin Duggal at 2026-03-12T17:33:28+05:30

  DmdAnal: Take stable unfoldings into account when determining argument demands
  
  Previously, demand analysis only looked at the RHS to compute argument demands.
  If the optimised RHS discarded uses of an argument that the stable unfolding
  still needed, it would be incorrectly marked absent. Worker/wrapper would then
  replace it with LitRubbish, and inlining the stable unfolding would use the
  rubbish value, causing a segfault.
  
  To fix, we introduce addUnfoldingDemands which analyses the stable unfolding
  with dmdAnal and combines its DmdType with the RHS's via the new `maxDmdType`
  which combines the demands of the stable unfolding with the rhs, so we can avoid
  any situation where we give an absent demand to something which is still used
  by the stable unfolding.
  
  Fixes #26416.
  

• 669d09f9
  by Cheng Shao at 2026-03-13T15:06:07-04:00

  hadrian: remove redundant library/rts ways definitions from stock flavours
  
  This patch removes redundant library/rts ways definitions from stock
  flavours in hadrian; they can be replaced by applying appropriate
  filters on `defaultFlavour`.
  

• a27dc081
  by Teo Camarasu at 2026-03-13T15:06:51-04:00

  ghc-internal: move bits Weak of finalizer interface to base
  
  We move parts of the Weak finalizer interface to `base` only the parts
  that the RTS needs to know about are kept in `ghc-internal`.
  
  This lets us then prune our imports somewhat and get rid of some SOURCE imports.
  
  Resolves #26985
  

• 6eef855b
  by Sylvain Henry at 2026-03-13T15:08:18-04:00

  Stg/Unarise: constant-folding during unarisation (#25650)
  
  When building an unboxed sum from a literal argument, mkUbxSum
  previously emitted a runtime cast via `case primop [lit] of var -> ...`.
  This wrapper prevented GHC from recognising the result as a static
  StgRhsCon, causing top-level closures to be allocated as thunks instead
  of being statically allocated.
  
  Fix: try to perform the numeric literal cast at compile time using
  mkLitNumberWrap (wrapping semantics). If successful, return the cast
  literal directly with an identity wrapper (no case expression). The
  runtime cast path is kept as fallback for non-literal arguments.
  
  Test: codeGen/should_compile/T25650
  

• 905f8723
  by Simon Jakobi at 2026-03-13T15:09:09-04:00

  Add regression test for #2057
  
  Test that GHC stops after an interface-file error instead of
  continuing into the linker.
  
  The test constructs a stale package dependency on purpose. `pkgB` is compiled
  against one version of package `A`, then the same unit id is replaced by an
  incompatible build of `A`. When `Main` imports `B`, GHC has to read `B.hi`,
  finds an unfolding that still mentions the old `A`, and should fail while
  loading interfaces.
  
  Closes #2057.
  
  Assisted-by: Codex
  

• a13245a9
  by Sylvain Henry at 2026-03-13T15:10:06-04:00

  JS: fix recompilation avoidance (#23013)
  
  - we were checking the mtime of the *.jsexe directory, not of a file
  - we were not computing the PkgsLoaded at all
  

• 07442653
  by Cheng Shao at 2026-03-13T15:10:51-04:00

  hadrian: bump index state & bootstrap plans
  
  This patch bumps hadrian index state & bootstrap plans:
  
  - The updated index state allows bootstrapping from 9.14 without cabal
    allow-newer hacks
  - The updated bootstrap plans all contain shake-0.19.9 containing
    important bugfix, allowing a subsequent patch to bump shake bound to
    ensure the bugfix is included
  - ghc 9.14.1 bootstrap plan is added
  

• fdc1dbad
  by Cheng Shao at 2026-03-13T15:10:51-04:00

  ci: add ghc 9.14.1 to bootstrap matrix
  
  This patch adds ghc 9.14.1 to bootstrap matrix, so that we test
  bootstrapping from ghc 9.14.1.
  

• 91916079
  by Sylvain Henry at 2026-03-13T15:11:43-04:00

  T17912: wait for opener thread to block before killing it (#24739)
  
  Instead of a fixed 1000ms delay, poll threadStatus until the opener
  thread is in BlockedOnForeignCall, ensuring killThread only fires once
  the thread is provably inside the blocking open() syscall. This prevents
  the test from accidentally passing on Windows due to scheduling races.
  

• baa4ebb4
  by Cheng Shao at 2026-03-13T15:12:26-04:00

  template-haskell: fix redundant import in Language.Haskell.TH.Quote
  
  This patch fixes a redundant import in `Language.Haskell.TH.Quote`
  that causes a ghc build failure when bootstrapping from 9.14 with
  validate flavours. Fixes #27014.
  

• 02e68a86
  by Brandon Simmons at 2026-03-13T15:13:19-04:00

  Add a cumulative gc_sync_elapsed_ns counter to GHC.Internal.Stats
  
  This makes it possible to get an accurate view of time spent in sync
  phase when using prometheus-style sampling. Previously this was only
  available for the most recent GC.
  
  This intentionally leaves GHC.Stats API unchanged since it is marked as
  deprecated, and API changes there require CLC approval.
  
  Fixes #26944
  

• a18fa3c1
  by Cheng Shao at 2026-03-14T05:12:14-04:00

  configure: make $LLVMAS default to $CC when $CcLlvmBackend is YES
  
  This patch changes the $LLVMAS detection logic in configure so that
  when it's not manually specified by the user, it defaults to $CC if
  $CcLlvmBackend is YES. It's a more sensible default than auto-detected
  clang from the environment, especially when cross-compiling, $CC as
  the cross target's LLVM assembler is more compatible with the use case
  than the system-wide clang. Fixes #26769.
  

• 3774086e
  by Matthew Pickering at 2026-03-14T05:13:00-04:00

  exceptions: annotate onException continuation with WhileHandling
  
  Before this patch, an exception thrown in the `onException` handler
  would loose track of where the original exception was thrown.
  
  ```
  import Control.Exception
  
  main :: IO ()
  main = failingAction `onException` failingCleanup
    where
      failingAction = throwIO (ErrorCall "outer failure")
      failingCleanup = throwIO (ErrorCall "cleanup failure")
  ```
  
  would report
  
  ```
  T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
  
  cleanup failure
  
  HasCallStack backtrace:
    throwIO, called at T28399.hs:<line>:<column> in <package-id>:Main
  ```
  
  notice that the "outer failure" exception is not present in the error
  message.
  
  With this patch, any exception thrown is in the handler is annotated
  with WhileHandling. The resulting message looks like
  
  ```
  T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:
  
  cleanup failure
  
  While handling outer failure
  
  HasCallStack backtrace:
    throwIO, called at T28399.hs:7:22 in main:Main
  ```
  
  CLC Proposal: https://github.com/haskell/core-libraries-committee/issues/397
  
  Fixes #26759
  

• 63ae8eb3
  by Andreas Klebinger at 2026-03-14T05:13:43-04:00

  Fix missing profiling header for origin_thunk frame.
  
  Fixes #27007
  

• 213d2c0e
  by Cheng Shao at 2026-03-14T05:14:28-04:00

  ci: fix ci-images revision
  
  The current ci-images revision was a commit on the WIP branch of
  https://gitlab.haskell.org/ghc/ci-images/-/merge_requests/183, and
  it's not on the current ci-images master branch. This patch fixes the
  image revision to use the current tip of ci-images master.
  

• fc2b083f
  by Andreas Klebinger at 2026-03-14T05:15:14-04:00

  Revert "hadrian/build-cabal: Better respect and utilize -j"
  
  This reverts commit eab3dbba79650e6046efca79133b4c0a5257613d.
  
  While it's neat this currently isn't well supported on all platforms.
  
  It's time will come, but for now I'm reverting this to avoid issues for
  users on slightly unconvential platforms.
  
  This will be tracked at #26977.
  

• 12a706cf
  by Cheng Shao at 2026-03-14T16:37:54-04:00

  base: fix redundant imports in GHC.Internal.Weak.Finalize
  
  This patch fixes redundant imports in GHC.Internal.Weak.Finalize that
  causes a regression in bootstrapping head from 9.14 with validate
  flavours. Fixes #27026.
  

• b5d39cad
  by Matthew Pickering at 2026-03-14T16:38:37-04:00

  Use explicit syntax rather than pure
  

• 43638643
  by Andreas Klebinger at 2026-03-15T18:15:48-04:00

  Configure: Fix check for --target support in stage0 CC
  
  The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for
  --target support. However this fails for the stage0 config where the C
  compiler used is not $CC but $CC_STAGE0.
  
  Since we already pass the compiler under test into the macro I simply
  changed it to use that instead.
  
  Fixes #26999
  

• 18fd0df6
  by Simon Hengel at 2026-03-15T18:16:33-04:00

  Fix typo in recursive_do.rst

• 86bd9bfc
  by fendor at 2026-03-17T23:46:09-04:00

  Introduce `-fimport-loaded-targets` GHCi flag
  
  This new flag automatically adds all loaded targets to the GHCi session
  by adding an `InteractiveImport` for the loaded targets.
  
  By default, this flag is disabled, as it potentially increases memory-usage.
  
  This interacts with the flag `-fno-load-initial-targets` as follows:
  
  * If no module is loaded, no module is added as an interactive import.
  * If a reload loads up to a module, all loaded modules are added as
    interactive imports.
  * Unloading modules removes them from the interactive context.
  
  Fixes #26866 by rendering the use of a `-ghci-script` to achieve the
  same thing redundant.
  

• e3d4c1bb
  by mniip at 2026-03-17T23:47:03-04:00

  ghc-internal: Remove GHC.Internal.Data.Eq
  
  It served no purpose other than being a re-export.
  

• 6f4f6cf0
  by mniip at 2026-03-17T23:47:03-04:00

  ghc-internal: Refine GHC.Internal.Base imports
  
  Removed re-exports from GHC.Internal.Base. This reveals some modules
  that don't actually use anything *defined* in GHC.Internal.Base, and
  that can be pushed down a little in the import graph.
  
  Replaced most imports of GHC.Internal.Base with non-wildcard imports
  from modules where the identifiers are actually defined.
  
  Part of #26834
  
  Metric Decrease:
      T5321FD
  

• 7fb51f54
  by mangoiv at 2026-03-17T23:48:00-04:00

  ci: clone, don't copy when creating the cabal cache
  
  Also removed WINDOWS_HOST variable detected via uname - we now just
  check whether the CI job has windows in its name. This works because we
  only ever care about it if the respective job is not a cross job. We
  also statically detect darwin cross jobs in the same way. We only ever have
  darwin -> darwin cross jobs so this is enough to detect the host
  reliably.
  

• f8817879
  by mangoiv at 2026-03-17T23:48:44-04:00

  ci: mark size_hello_artifact fragile on darwin x86
  
  The size of the x86_64 hello artifact is not stable which results in flaky testruns.
  
  Resolves #26814
  

• e34cb6da
  by Adam Gundry at 2026-03-20T12:20:00-04:00

  ghci: Mention active language edition in startup banner
  
  Per GHC proposal 632, this makes the GHCi startup banner include
  the active language edition, plus an indication of whether this
  was the default (as opposed to being explicitly selected via an
  option such as `-XGHC2024`). For example:
  
  ```
  $ ghci
  GHCi, version 9.14.1: https://www.haskell.org/ghc/  :? for help
  Using default language edition: GHC2024
  ghci>
  ```
  
  Fixes #26037.
  

• 52c3e6ba
  by sheaf at 2026-03-20T12:21:09-04:00

  Improve incomplete record selector warnings
  
  This commit stops GHC from emitting spurious incomplete record selector
  warnings for bare selectors/projections such as .fld
  
  There are two places we currently emit incomplete record selector
  warnings:
  
    1. In the desugarer, when we see a record selector or an occurrence
       of 'getField'. Here, we can use pattern matching information to
       ensure we don't give false positives.
    2. In the typechecker, which might sometimes give false positives but
       can emit warnings in cases that the pattern match checker would
       otherwise miss.
  
  This is explained in Note [Detecting incomplete record selectors]
  in GHC.HsToCore.Pmc.
  
  Now, we obviously don't want to emit the same error twice, and generally
  we prefer (1), as those messages contain fewer false positives. So we
  suppress (2) when we are sure we are going to emit (1); the logic for
  doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel,
  and works by looking at the CtOrigin.
  
  Now, the issue was that this logic handled explicit record selectors as
  well as overloaded record field selectors such as "x.r" (which turns
  into a simple GetFieldOrigin CtOrigin), but it didn't properly handle
  record projectors like ".fld" or ".fld1.fld2" (which result in other
  CtOrigins such as 'RecordFieldProjectionOrigin').
  
  To solve this problem, we re-use the 'isHasFieldOrigin' introduced in
  fbdc623a (slightly adjusted).
  
  On the way, we also had to update the desugarer with special handling
  for the 'ExpandedThingTc' case in 'ds_app', to make sure that
  'ds_app_var' sees all the type arguments to 'getField' in order for it
  to indeed emit warnings like in (1).
  
  Fixes #26686
  

• 309d7e87
  by Cheng Shao at 2026-03-20T12:21:53-04:00

  rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray#
  
  Following !15234, this patch improves `resizeMutableByteArray#` memory
  efficiency by growing the `MutableByteArray#` in-place if possible,
  addressing an old todo comment here. Also adds a new test case
  `resizeMutableByteArrayInPlace` that stresses this behavior.
  

• 7d4ef162
  by Matthew Craven at 2026-03-20T12:22:47-04:00

  Change representation of floating point literals
  
  This commit changes the representation of floating point literals
  throughough the compiler, in particular in Core and Cmm.
  The Rational type is deficient for this purpose, dealing poorly
  with NaN, +/-Infinity, and negative zero. Instead, the new module
  GHC.Types.Literal.Floating uses the host Float/Double type to represent
  NaNs, infinities and negative zero. It also contains a Rational
  constructor, for the benefit of -fexcess-precision.
  
  Other changes:
  
    - Remove Note [negative zero] and related code
      This also removes the restrictions on constant-folding of division
      by zero, and should make any problems with NaN/Infinity more obvious.
  
    - Use -0.0 as the additive identity for Core constant folding rules
      for floating-point addition, fixing #21227.
  
    - Manual worker-wrapper for GHC.Float.rationalToDouble. This is
      intended to prevent the compiler's WW on this function from
      interfering with constant-folding. This change means that we now
      avoid allocating a box for the result of a 'realToFrac' call in
      T10359.
  
    - Combine floatDecodeOp and doubleDecodeOp.
      This change also fixes a bug in doubleDecodeOp wherein it
      would incorrectly produce an Int# instead of an Int64#
      literal for the mantissa component with 64-bit targets.
  
    - Use Float/Double for assembly immediates, and update the X86 and
      PowerPC backends to properly handle special values such as NaN and
      infinity.
  
    - Allow 'rational_to' to handle zero denominators, fixing a
      TODO in GHC.Core.Opt.ConstantFold.
  
  Fixes #8364 #9811 #18897 #21227
  Progress towards #26919
  
  Metric Decrease:
      T10359
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  
  -------------------------
  Metric Decrease:
      T1969
      T5321FD
  -------------------------
  

• 80e2dd4f
  by Zubin Duggal at 2026-03-20T12:23:33-04:00

  compiler/ffi: Collapse void pointer chains in capi wrappers
  
  New gcc/clang treat -Wincompatible-pointer-types as an error by
  default. Since C only allows implicit conversion from void*, not void**,
  capi wrappers for functions taking e.g. abstract** would fail to compile
  when the Haskell type Ptr (Ptr Abstract) was naively translated to void**.
  
  Collapse nested void pointers to a single void* when the pointee type
  has no known C representation.
  
  Fixes #26852
  

• 1c50bd7b
  by Luite Stegeman at 2026-03-20T12:24:37-04:00

  Move some functions related to pointer tagging to a separate module
  

• bfd7aafd
  by Luite Stegeman at 2026-03-20T12:24:37-04:00

  Branchless unpacking for enumeration types
  
  Change unpacking for enumeration types to go to Word8#/Word16#/Word#
  directly instead of going through an intermediate unboxed sum. This
  allows us to do a branchless conversion using DataToTag and TagToEnum.
  
  Fixes #26970
  

• 72b20fc0
  by Luite Stegeman at 2026-03-20T12:25:30-04:00

  bytecode: Carefully SLIDE off the end of a stack chunk
  
  The SLIDE bytecode instruction was not checking for stack chunk
  boundaries and could corrupt the stack underflow frame, leading
  to crashes.
  
  We add a check to use safe writes if we cross the chunk boundary
  and also handle stack underflow if Sp is advanced past the underflow
  frame.
  
  fix #27001
  

• 2e22b43c
  by Cheng Shao at 2026-03-20T12:26:14-04:00

  ghci: serialize BCOByteArray buffer directly when possible
  
  This patch changes the `Binary` instances of `BCOByteArray` to
  directly serialize the underlying buffer when possible, while also
  taking into account the issue of host-dependent `Word` width. See
  added comments and amended `Note [BCOByteArray serialization]` for
  detailed explanation. Closes #27020.
  

• 89d9ba37
  by Sylvain Henry at 2026-03-20T12:27:34-04:00

  JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597)
  
  Replace BigInt-based implementations of quotWord32, remWord32,
  quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and
  remInt64 with pure Number (double/integer) arithmetic to avoid the
  overhead of BigInt promotion.
  

• ae4ddd60
  by Sylvain Henry at 2026-03-20T12:28:28-04:00

  Core: add constant-folding rules for Addr# eq/ne (#18032)
  

• 3e767f98
  by Matthew Pickering at 2026-03-20T12:29:11-04:00

  Use OsPath rather than FilePath in Downsweep cache
  
  This gets us one step closure to uniformly using `OsPath` in the
  compiler.
  

• 2c57de29
  by Cheng Shao at 2026-03-20T12:29:55-04:00

  hadrian: fix ghc-in-ghci flavour stage0 shared libraries
  
  This patch fixes missing stage0 shared libraries in hadrian
  ghc-in-ghci flavour, which was accidentally dropped in
  669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression
  in HLS support on linux/macos. Fixes #27057.
  

• 5b1be555
  by Sylvain Henry at 2026-03-20T12:30:48-04:00

  JS: install rts/Types.h header file (#27033)
  
  It was an omission, making HsFFI.h not usable with GHC using the JS
  backend.
  

• b883f08f
  by Cheng Shao at 2026-03-20T12:31:33-04:00

  hadrian: don't compile RTS with -Winline
  
  This patch removes `-Winline` from cflags when compiling the RTS,
  given that:
  
  1. It generates a huge pile of spam and hurts developer experience
  2. Whether inlining happens is highly dependent on toolchains,
     flavours, etc, and it's not really an issue to fix if inlining
     doesn't happen; it's a hint to the C compiler anyway.
  
  Fixes #27060.
  

• 333387d6
  by Cheng Shao at 2026-03-20T12:31:33-04:00

  hadrian: compile libffi-clib with -Wno-deprecated-declarations
  
  This patch adds `-Wno-deprecated-declarations` to cflags of
  `libffi-clib`, given that it produces noise at compile-time that
  aren't really our issue to fix anyway, it's from vendored libffi
  source code.
  

• 67c47771
  by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00

  Expose decodeStackWithIpe from ghc-experimental
  
  This decoding is useful to the debugger and it wasn't originally
  exported as an oversight.
  

• 18513365
  by Matthew Pickering at 2026-03-21T04:43:26-04:00

  Add support for custom external interpreter commands
  
  It can be useful for GHC API clients to implement their own external
  interpreter commands.
  
  For example, the debugger may want an efficient way to inspect the
  stacks of the running threads in the external interpreter.
  

• 4636d906
  by mangoiv at 2026-03-21T04:44:10-04:00

  ci: remove obsolete fallback for old debian and ubuntu versions
  

• 2e3a2805
  by mangoiv at 2026-03-21T04:44:10-04:00

  ci: drop ubuntu 18 and 20
  
  Ubuntu 18 EOL: May 2023
  Ubuntu 20 EOL: May 2025
  
  We should probably not make another major release supporting these platforms.
  
  Also updates the generator script.
  
  Resolves #25876
  

• de54e264
  by Cheng Shao at 2026-03-21T17:52:08+01:00

  rts: fix -Wcompare-distinct-pointer-types errors
  
  This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS
  which should have been caught by the `validate` flavour but was
  warnings in CI due to the recent `+werror` regression.
  

• b9bd73de
  by Cheng Shao at 2026-03-21T17:52:08+01:00

  ghc-internal: fix unused imports
  
  This commit fixes unused imports in `ghc-internal` which should have
  been caught by the `validate` flavour but was warnings in CI due to
  the recent `+werror` regression. Fixes #26987 #27059.
  

• da946a16
  by Cheng Shao at 2026-03-21T17:03:51+00:00

  ghci: fix unused imports
  
  This commit fixes unused imports in `ghci` which should have been
  caught by the `validate` flavour but was warnings in CI due to the
  recent `+werror` regression. Fixes #26987 #27059.
  

• 955b1cf8
  by Cheng Shao at 2026-03-21T17:03:51+00:00

  compiler: fix unused imports in GHC.Tc.Types.Origin
  
  This commit fixes unused imports in `GHC.Tc.Types.Origin` which should
  have been caught by the `validate` flavour but was warnings in CI due
  to the recent `+werror` regression. Fixes #27059.
  

• 3b1aeb50
  by Cheng Shao at 2026-03-21T17:03:51+00:00

  hadrian: fix missing +werror in validate flavour
  
  This patch fixes missing `+werror` in validate flavour, which was an
  oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066.
  

• 44f118f0
  by Cheng Shao at 2026-03-22T04:54:01-04:00

  ci: bump CACHE_REV and add the missing reminder
  
  This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI
  errors due to stale cabal cache on some runners, and also adds a
  reminder to remind future maintainers. Fixes #27075.
  

• 2a218737
  by ARATA Mizuki at 2026-03-23T11:11:39-04:00

  Add 128-bit SIMD support to AArch64 NCG
  
  Changes:
  
  - Add `Format` field to vector-capable instructions.
    These instructions will emit `vN.4s` (for example) as a operand.
  - Additional constructors for `Operand`:
    `OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example).
    `OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example).
  - Integer quot/rem are implemented in C, like x86.
  
  Closes #26536
  
  Metric Increase:
      T3294
  

• 5d6e2be9
  by ARATA Mizuki at 2026-03-23T11:11:39-04:00

  AArch64 NCG: Improve code generation for floating-point and vector constants
  
  Some floating-point constants can be directly encoded using the FMOV instruction.
  Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI.
  

• c6d262aa
  by Simon Jakobi at 2026-03-23T11:12:22-04:00

  Add regression test for #13729
  
  Closes #13729.
  

• aa5dfe67
  by Sylvain Henry at 2026-03-26T03:48:56-04:00

  Check that shift values are valid
  
  In GHC's codebase in non-DEBUG builds we silently substitute shiftL/R
  with unsafeShiftL/R for performance reasons. However we were not
  checking that the shift value was valid for unsafeShiftL/R, leading to
  wrong computations, but only in non-DEBUG builds.
  
  This patch adds the necessary checks and reports an error when a wrong
  shift value is passed.
  

• c8a7b588
  by Sylvain Henry at 2026-03-26T03:48:56-04:00

  Implement basic value range analysis (#25718)
  
  Perform basic value range analysis to try to determine at compile time
  the result of the application of some comparison primops (ltWord#, etc.).
  
  This subsumes the built-in rewrite rules used previously to check if one
  of the comparison argument was a bound (e.g. (x :: Word8) <= 255 is
  always True). Our analysis is more powerful and handles type
  conversions: e.g. word8ToWord x <= 255 is now detected as always True too.
  
  We also use value range analysis to filter unreachable alternatives in
  case-expressions. To support this, we had to allow case-expressions for
  primitive types to not have a DEFAULT alternative (as was assumed before
  and checked in Core lint).
  

• a5ec467e
  by ARATA Mizuki at 2026-03-26T03:49:49-04:00

  rts: Align stack to 64-byte boundary in StgRun on x86
  
  When LLVM spills AVX/AVX-512 vector registers to the stack, it requires
  32-byte (__m256) or 64-byte (__m512) alignment. If the stack is not
  sufficiently aligned, LLVM inserts a realignment prologue that reserves
  %rbp as a frame pointer, conflicting with GHC's use of %rbp as an STG
  callee-saved register and breaking the tail-call-based calling convention.
  
  Previously, GHC worked around this by lying to LLVM about the stack
  alignment and rewriting aligned vector loads/stores (VMOVDQA, VMOVAPS)
  to unaligned ones (VMOVDQU, VMOVUPS) in the LLVM Mangler. This had two
  problems:
  
  - It did not extend to AVX-512, which requires 64-byte alignment. (#26595)
  - When Haskell calls a C function that takes __m256/__m512 arguments on
    the stack, the callee requires genuine alignment, which could cause a
    segfault. (#26822)
  
  This patch genuinely aligns the stack to 64 bytes in StgRun by saving
  the original stack pointer before alignment and restoring it in
  StgReturn. We now unconditionally advertise 64-byte stack alignment to
  LLVM for all x86 targets, making rewriteAVX in the LLVM Mangler
  unnecessary. STG_RUN_STACK_FRAME_SIZE is increased from 48 to 56 bytes
  on non-Windows x86-64 to store the saved stack pointer.
  
  Closes #26595 and #26822
  
  Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
  

• 661da815
  by Teo Camarasu at 2026-03-26T03:50:33-04:00

  ghc-internal: Float Generics to near top of module graph
  
  We remove GHC.Internal.Generics from the critical path of the
  `ghc-internal` module graph. GHC.Internal.Generics used to be in the
  middle of the module graph, but now it is nearer the top (built later).
  This change thins out the module graph and allows us to get rid of the
  ByteOrder hs-boot file.
  
  We implement this by moving Generics instances from the module where the
  datatype is defined to the GHC.Internal.Generics module. This trades off
  increasing the compiled size of GHC.Internal.Generics with reducing the
  dependency footprint of datatype modules.
  
  Not all instances are moved to GHC.Internal.Generics. For instance,
  `GHC.Internal.Control.Monad.Fix` keeps its instance as it is one of the
  very last modules compiled in `ghc-internal` and so inverting the
  relationship here would risk adding GHC.Internal.Generics back onto the
  critical path.
  We also don't change modules that are re-exported from the `template-haskell` or `ghc-heap`.
  This is done to make it easy to eventually move `Generics` to `base`
  once something like #26657 is implemented.
  
  Resolves #26930
  
  Metric Decrease:
      T21839c
  

• 45428f88
  by sheaf at 2026-03-26T03:51:31-04:00

  Avoid infinite loop in deep subsumption
  
  This commit ensures we only unify after we recur in the deep subsumption
  code in the FunTy vs non-FunTy case of GHC.Tc.Utils.Unify.tc_sub_type_deep,
  to avoid falling into an infinite loop.
  
  See the new Wrinkle [Avoiding a loop in tc_sub_type_deep] in
  Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.
  
  Fixes #26823
  
  Co-authored-by: simonpj <simon.peytonjones@gmail.com>
  

• 2823b039
  by Ian Duncan at 2026-03-26T03:52:21-04:00

  AArch64: fix MOVK regUsageOfInstr to mark dst as both read and written
  
  MOVK (move with keep) modifies only a 16-bit slice of the destination
  register, so the destination is both read and written. The register
  allocator must know this to avoid clobbering live values. Update
  regUsageOfInstr to list the destination in both src and dst sets.
  
  No regression test: triggering the misallocation requires specific
  register pressure around a MOVK sequence, which is difficult to
  reliably provoke from Haskell source.
  

• 57b7878d
  by Simon Jakobi at 2026-03-26T03:53:07-04:00

  Add regression test for #12002
  
  Closes #12002.
  

• c8f9df2d
  by Simon Jakobi at 2026-03-26T03:53:07-04:00

  Add regression test for #12046
  
  Closes #12046.
  
  Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>
  

• 615d72ac
  by Simon Jakobi at 2026-03-26T03:53:07-04:00

  Add regression test for #13180
  
  Closes #13180.
  

• 423eebcf
  by Simon Jakobi at 2026-03-26T03:53:07-04:00

  Add regression test for #11141
  
  Closes #11141.
  

• 286849a4
  by Simon Jakobi at 2026-03-26T03:53:07-04:00

  Add regression test for #11505
  
  Closes #11505.
  

• 7db149d9
  by Simon Jakobi at 2026-03-26T03:53:07-04:00

  Add regression perf test for #13820
  
  Closes #13820.
  

• e73c4adb
  by Simon Jakobi at 2026-03-26T03:53:07-04:00

  Add regression test for #10381
  
  Closes #10381.
  

• 5ebcfb57
  by Benjamin Maurer at 2026-03-26T03:54:02-04:00

  Generate assembly on x86 for word2float (#22252)
  
  We used to emit C function call for MO_UF_Conv primitive.
  Now emits direct assembly instead.
  
  Co-Authored-By: Sylvain Henry <sylvain@haskus.fr>
  Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
  

• 5b550754
  by Matthew Pickering at 2026-03-26T03:54:51-04:00

  rts: forward clone-stack messages after TSO migration
  
  MSG_CLONE_STACK assumed that the target TSO was still owned by the
  capability that received the message. This is not always true: the TSO
  can migrate before the inbox entry is handled.
  
  When that happened, handleCloneStackMessage could clone a live stack from
  the wrong capability and use the wrong capability for allocation and
  performTryPutMVar, leading to stack sanity failures such as
  checkStackFrame: weird activation record found on stack.
  
  Fix this by passing the current capability into
  handleCloneStackMessage, rechecking msg->tso->cap at handling time, and
  forwarding the message if the TSO has migrated. Once ownership matches,
  use the executing capability consistently for cloneStack, rts_apply, and
  performTryPutMVar.
  
  Fixes #27008
  

• ef0a1bd2
  by mangoiv at 2026-03-26T03:55:34-04:00

  release tracking: adopt release tracking ticket from #16816
  

• a7f40fd9
  by mangoiv at 2026-03-26T03:55:34-04:00

  release tracking: add a release tracking ticket
  
  Brings the information in the release tracking ticket up to date with
  https://gitlab.haskell.org/ghc/ghc-hq/-/blob/main/release-management.mkd
  
  Resolves #26691
  

• 161d3285
  by Teo Camarasu at 2026-03-26T03:56:18-04:00

  Revert "Set default eventlog-flush-interval to 5s"
  
  Flushing the eventlog forces a synchronisation of all the capabilities
  and there was a worry that this might lead to a performance cost for
  some highly parallel workloads.
  
  This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2.
  

• 36eed985
  by Cheng Shao at 2026-03-26T03:57:03-04:00

  ghc-boot: move GHC.Data.SmallArray to ghc-boot
  
  This commit moves `GHC.Data.SmallArray` from the `ghc` library to
  `ghc-boot`, so that it can be used by `ghci` as well:
  
  - The `Binary` (from `ghc`) instance of `SmallArray` is moved to
    `GHC.Utils.Binary`
  - Util functions `replicateSmallArrayIO`, `mapSmallArrayIO`,
    `mapSmallArrayM_`, `imapSmallArrayM_` , `smallArrayFromList` and
    `smallArrayToList` are added
  - The `Show` instance is added
  - The `Binary` (from `binary`) instance is added
  

• fdf828ae
  by Cheng Shao at 2026-03-26T03:57:03-04:00

  compiler: use `Binary` instance of `BCOByteArray` for bytecode objects
  
  This commit defines `Binary` (from `compiler`) instance of
  `BCOByteArray` which serializes the underlying buffer directly, and
  uses it directly in bytecode object serialization. Previously we reuse
  the `Binary` (from `binary`) instance, and this change allows us to
  avoid double-copying via an intermediate `ByteString` when using
  `put`/`get` in `binnary`. Also see added comment for explanation.
  

• 3bf62d0a
  by Cheng Shao at 2026-03-26T03:57:03-04:00

  ghci: use SmallArray directly in ResolvedBCO
  
  This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when
  applicable, making the memory representation more compact and reducing
  marshaling overhead. Closes #27058.
  

• 3d6492ce
  by Wen Kokke at 2026-03-26T03:57:53-04:00

  Fix race condition between flushEventLog and start/endEventLogging.
  
  This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving:
  
  - `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`.
  - `flushEventLog` flushes some events to `event_log_writer`.
  - `startEventLogging` writes the eventlog header to `event_log_writer`.
  
  This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header.
  
  This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as:
  
  ```c
  void flushEventLog(Capability **cap USED_IF_THREADS)
  {
    ACQUIRE_LOCK(&state_change_mutex);
    flushEventLog_(cap);
    RELEASE_LOCK(&state_change_mutex);
  }
  ```
  
  The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable.
  
  I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours.
  

• 7b9a75f0
  by Phil Hazelden at 2026-03-26T03:58:37-04:00

  Fix build with werror on glibc 2.43.
  
  We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same
  values as defined in glibc prior to 2.43. But in 2.43, glibc changes
  them to new values, which means we get a warning when redefining them.
  By `#undef`ing them first, we no longer get a warning.
  
  Closes #27076.
  

• fe6e76c5
  by Tobias Haslop at 2026-03-26T03:59:30-04:00

  Fix broken Haddock link to Bifunctor class in description of Functor class
  

• 404b71c1
  by Luite Stegeman at 2026-03-27T04:40:49-04:00

  Fix assert in Interpreter.c
  
  If we skip exactly the number of words on the stack we end up on
  the first word in the next chunk.
  

• a85bd503
  by Luite Stegeman at 2026-03-27T04:40:49-04:00

  Support arbitrary size unboxed tuples in bytecode
  
  This stores the size (number of words on the stack) of the next
  expected tuple in the TSO, ctoi_spill_size field, eliminating
  the need of stg_ctoi_tN frames for each size.
  
  Note: On 32 bit platform there is still a bytecode tuple size
  limit of 255 words on the stack.
  
  Fixes #26946
  

• e2209031
  by Luite Stegeman at 2026-03-27T04:40:49-04:00

  Add specialized frames for small tuples
  
  Small tuples are now returned more efficiently to the interpreter.
  They use one less word of stack space and don't need manipulation
  of the TSO anymore.
  

• b26bb2ea
  by VeryMilkyJoe at 2026-03-27T04:41:38-04:00

  Remove backwards compatibility pattern synonym `ModLocation`
  
  Fixes #24932
  

• 66e5e324
  by Vladislav Zavialov at 2026-03-27T04:42:25-04:00

  Extend HsExpr with the StarIsType syntax (#26587, #26967)
  
  This patch allows kinds of the form `k -> *` and `* -> k` to occur in
  expression syntax, i.e. to be used as required type arguments.
  
  For example:
  
  	{-# LANGUAGE RequiredTypeArguments, StarIsType #-}
  	x1 = f (* -> * -> *)
  	x2 = f (forall k. k -> *)
  	x3 = f ((* -> *) -> Constraint)
  
  Summary of the changes:
  
  * Introduce the HsStar constructor of HsExpr and its extension field XStar.
    It is analogous to HsStarTy in HsType.
  
  * Refactor HsStarTy to store the unicode flag as TokStar, defined as
      type TokStar = EpUniToken "*" "★"  -- similar to TokForall, TokRArrow, etc.
    The token is stored in the extension field and replaces the Bool field.
  
  * Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`.
    This is more limited than the full StarIsType syntax, but has the nice
    property of not conflicting with the multiplication operator `a * b`.
  
  Test case: T26967 T26967_tyop
  

• f8de456f
  by Sylvain Henry at 2026-03-27T04:43:22-04:00

  STM: don't create a transaction in the rhs of catchRetry# (#26028)
  
  We don't need to create a transaction for the rhs of (catchRetry#)
  because contrary to the lhs we don't need to abort it on retry. Moreover
  it is particularly harmful if we have code such as (#26028):
  
    let cN = readTVar vN >> retry
        tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
    atomically tree
  
  Because it will stack transactions for the rhss and the read-sets of all
  the transactions will be iteratively merged in O(n^2) after the
  execution of the most nested retry.
  
  This is the second attempt at implementing this. The first attempt
  triggered segfaults (#26291) and has been reverted.
  
  Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
  

• fcf092dd
  by Luite Stegeman at 2026-03-27T04:44:17-04:00

  Windows: remove StgAsyncIOResult and fix crash/leaks
  
  In stg_block_async{_void}, a stack slot was reserved for
  an StgAsyncIOResult. This slot would be filled by the IO
  manager upon completion of the async call.
  
  However, if the blocked thread was interrupted by an async
  exception, we would end up in an invalid state:
  
   - If the blocked computation was never re-entered, the
     StgAsyncIOResult would never be freed.
   - If the blocked computation was re-entered, the thread would
     find an unitialized stack slot for the StgAsyncIOResult,
     leading to a crash reading its fields, or freeing the pointer.
  
  We fix this by removing the StgAsyncIOResult altogether and writing
  the result directly to the stack.
  
  Fixes #26341
  

• 05094993
  by Luite Stegeman at 2026-03-27T04:45:12-04:00

  Don't refine DEFAULT alt for unary typeclasses
  
  A non-DEFAULT data alt for a unary typeclass dictionary would
  interfere with Unary Class Magic, leading to segfaults.
  
  fixes #27071
  

• 4ee260cf
  by sheaf at 2026-03-27T04:46:06-04:00

  Fix several oversights in hsExprType
  
  This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType:
  
    - The 'RecordCon' case was returning the type of the constructor,
      instead of the constructor application. This is fixed by using
      'splitFunTys'.
    - The 'ExplicitTuple' case failed to take into account tuple sections,
      and was also incorrectly handling 1-tuples (e.g. 'Solo') which can
      be constructed using Template Haskell.
    - The 'NegApp' case was returning the type of the negation operator,
      again failing to apply it to the argument. Fixed by using
      'funResultTy'.
    - The 'HsProc' case was computing the result type of the arrow proc
      block, without taking into account the argument type. Fix that by
      adding a new field to 'CmdTopTc' that stores the arrow type, so that
      we can construct the correct result type `arr a b` for
      `proc (pat :: a) -> (cmd :: b)`.
    - The 'ArithSeq' and 'NegApp' cases were failing to take into account
      the result 'HsWrapper', which could e.g. silently drop casts.
      This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on
      top of taking the result type, applies the result 'HsWrapper'.
  
  These fixes are validated by the new GHC API test T26910.
  
  Fixes #26910
  

• e97232ce
  by Hai at 2026-03-27T04:47:04-04:00

  Parser.y: avoid looking at token with QualifiedDo
  
  This changes the behavior of 'hintQualifiedDo' so that the supplied
  token is not inspected when the QualifiedDo language extension bit is
  set.
  

• 9831385b
  by Vladislav Zavialov at 2026-03-27T17:22:30-04:00

  Infix holes in types (#11107)
  
  This patch introduces several improvements that follow naturally from
  refactoring HsOpTy to represent the operator as an HsType, aligning it
  with the approach taken by OpApp and HsExpr.
  
  User-facing changes:
  
  1. Infix holes (t1 `_` t2) are now permitted in types, following the
     precedent set by term-level expressions.
  
     Test case: T11107
  
  2. Error messages for illegal promotion ticks are now reported at more
     precise source locations.
  
     Test case: T17865
  
  Internal changes:
  
  * The definition of HsOpTy now mirrors that of OpApp:
  
      | HsOpTy (XOpTy p)  (LHsType p) (LHsType p) (LHsType p)
      | OpApp  (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p)
  
    This moves us one step closer to unifying HsType and HsExpr.
  
  * Ignoring locations,
      the old pattern match (HsOpTy x prom lhs op rhs)
      is now written as     (HsOpTy x lhs (HsTyVar x' prom op) rhs)
      but we also handle    (HsOpTy x lhs (HsWildCardTy x')    rhs)
  
    Constructors other than HsTyVar and HsWildCardTy never appear
    in the operator position.
  
  * The various definitions across the compiler have been updated to work
    with the new representation, drawing inspiration from the term-level
    pipeline where appropriate.  For example,
  
       ppr_infix_ty       <=> ppr_infix_expr
       get_tyop           <=> get_op
       lookupTypeFixityRn <=> lookupExprFixityRn
             (the latter is factored out from rnExpr)
  
  Test cases: T11107 T17865
  

• 5b6757d7
  by mangoiv at 2026-03-27T17:23:19-04:00

  ci: build i386 non-validate for deb12
  
  This is a small fix that will unlock ghcup metadata to run, i386 debian
  12 was missing as a job.
  

• cf942119
  by Cheng Shao at 2026-03-30T15:24:37-04:00

  ghc-boot: remove unused SizedSeq instances and functions
  
  This commit removes unused `SizedSeq` instances and functions, only
  keeping the bits we need for hpc tick sequence for now.
  

• 22c5b7cc
  by Cheng Shao at 2026-03-30T15:24:38-04:00

  ghci: remove unused GHCi.BinaryArray
  
  This patch removes the unused `GHCi.BinaryArray` module from `ghci`.
  Closes #27108.
  

• 77abb4ab
  by Cheng Shao at 2026-03-30T15:25:21-04:00

  testsuite: mark T17912 as fragile on Windows
  
  T17912 is still fragile on Windows, it sometimes unexpectedly pass in
  CI. This especially strains our already scarce Windows CI runner
  resources. Mark it as fragile on Windows for the time being.
  

• d741a6cc
  by Andreas Klebinger at 2026-03-31T04:39:33-04:00

  Bump minimum shake version for hadrian.
  
  We also add the shake version we want to stack.yaml
  
  Fixes #26884
  

• 5e556f9e
  by Vladislav Zavialov at 2026-03-31T04:40:16-04:00

  Status check for the HsType~HsExpr refactoring (#25121)
  
  Add a test case to track the status of a refactoring project within GHC
  whose goal is to arrive at the following declaration:
  
  	type HsType = HsExpr
  
  The rationale for this is to increase code reuse between the term- and
  type-level code in the compiler front-end (AST, parser, renamer, type checker).
  
  The status report is saved to testsuite/tests/ghc-api/T25121_status.stdout
  and provides useful insights into what needs to happen to make progress on
  the ticket.
  

• acffb1b1
  by fendor at 2026-03-31T04:41:02-04:00

  Extract Binary instances to `GHC.ByteCode.Binary`
  

• e2ea8e25
  by fendor at 2026-03-31T04:41:02-04:00

  Add `seqNonEmpty` for evaluating `NonEmpty a`
  

• 048b00b7
  by fendor at 2026-03-31T04:41:02-04:00

  Record `LinkableUsage` instead of `Linkable` in `LoaderState`
  
  Retaining a ByteCode `Linkable` after it has been loaded retains its
  `UnlinkedBCO`, keeping it alive for the remainder of the program.
  This starts accumulating a lot of `UnlinkedBCO` and memory over time.
  However, the `Linkable` is merely used to later record its usage in
  `mkObjectUsage`, which  is used for recompilation checking.
  
  However, this is incorrect, as the interface file and bytecode objects
  could be in different states, e.g. the interface changes, but the
  bytecode library hasn't changed so we don't need to recompile and vice
  versa.
  
  By computing a `Fingerprint` for the `ModuleByteCode`, and recording it
  in the `LinkableUsage`, we know precisely whether the `ByteCode` object
  on disk is outdated.
  
  Thus, parts of this commit just makes sure that we efficiently compute a
  `Fingerprint` for `ModuleByteCode` and store it in the on-disk
  representation of `ModuleByteCode`.
  
  We change the `LoaderState` to retain `LinkableUsage`, which is smaller
  representation of a `Linkable`. This allows us to free the unneeded
  fields of `Linkable` after linking them.
  
  We declare the following memory invariants that this commit implements:
  
  * No `LinkablePart` should be retained from `LoaderState`.
  * `Linkable`s should be unloaded after they have been loaded.
  
  These invariants are unfortunately tricky to automatically uphold, so we
  are simply documenting our assumptions for now.
  
  We introduce the `linkable-space` test which makes sure that after
  loading, no `DotGBC` or `UnlinkedBCO` is retained.
  
  -------------------------
  Metric Increase:
      MultiLayerModulesTH_OneShot
  -------------------------
  
  We allocate a bit more, but the peak number of bytes doesn't change.
  While a bit unfortunate, accepting the metric increase.
  
  We add multiple new performance measurements where we were able to
  observe the desired memory invariants. Further, we add regression tests
  to validate that the recompilation checker behaves more correct than
  before.
  

• 2d1c1997
  by Simon Jakobi at 2026-03-31T04:41:46-04:00

  Eliminate dictionary-passing in ListMap operations
  
  Mark the ListMap helpers 'INLINABLE' so importing modules can specialise
  the 'TrieMap (ListMap m)' methods and avoid recursive dictionary-passing.
  
  See Note [Making ListMap operations specialisable].
  
  Fixes #27097
  

• ed2c6570
  by Cheng Shao at 2026-03-31T04:42:33-04:00

  testsuite: fix testdir cleanup logic on Windows
  
  testdir cleanup is unreliable on Windows (#13162) and despite existing
  hacks in the driver, new failure mode has occurred. This patch makes
  it print the warning and carry on when failed to clean up a testdir,
  instead of reporting a spurious framework failure. See added comment
  for detailed explanation.
  

• d9388e29
  by Simon Jakobi at 2026-03-31T13:14:59-04:00

  Add regression test for #18177
  
  Closes #18177.
  
  Assisted-by: Codex
  

• 6a10045c
  by mangoiv at 2026-03-31T13:15:43-04:00

  ci: allow metric decrease for two tests on i386
  
  There has been a nightly failure on i386 due to a compiler runtime
  improvement on i386 debian 12. We allow that.
  
  Metric Decrease (test_env='i386-linux-deb12'):
    T12707 T8095
  

• 7fbb4fcb
  by Rodrigo Mesquita at 2026-04-01T12:16:33+00:00

  Bump default language edition to GHC2024
  
  As per the accepted ghc-proposal#632
  
  Fixes #26039
  

• 5ae43275
  by Peng Fan at 2026-04-01T19:01:06-04:00

  NCG/LA64: add cmpxchg and xchg primops
  
  And append some new instructions for LA664 uarch.
  
  Apply fix to cmpxchg-prim by Andreas Klebinger.
  
  Suggestions in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15515
  

• 8f95534a
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  Remove signal-based ticker implementations
  
  Fixes issue #27073
  
  All supported platforms should work with the pthreads + nanosleep based
  ticker implementation. This avoids all the problems with using signals.
  
  In practice, all supported platforms were probably using the non-signal
  tickers already, which is probably why we do not get lots of reports
  about deadlocks and other weirdness: we were definately using functions
  that are not async signal safe in the tick handler (such as fflush to
  flussh the eventlog).
  
  Only Solaris was explicitly using the timer_create ticker impl, and even
  Solaris could probably use the pthreads one (if anyone cared: Solaris is
  no longer a Teir 3 supported platform).
  
  Plausibly the only supported platform that this will change will be AIX,
  which should now use the pthreads impl.
  

• 51b32b0d
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  Tidy up some timer/ticker comments elsewhere
  

• 7562bcd7
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  Remove now-unused install_vtalrm_handler
  
  Support function used by both of the signal-based ticker
  implementations.
  

• 6da127c7
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  No longer probe for timer_create in rts/configure
  
  It was only used by the TimerCreate.c ticker impl.
  

• 3fd490fa
  by Duncan Coutts at 2026-04-01T19:01:53-04:00

  Note that rtsTimerSignal is deprecated.
  

• 63099b0f
  by Simon Jakobi at 2026-04-01T19:02:39-04:00

  Add perf test for #13960
  
  Closes #13960.
  

• df2b91fd
  by Matthew Pickering at 2026-04-03T16:52:12+02:00

  Add support for instrumenting with eventlog-socket
  

• f2be313f
  by fendor at 2026-04-03T16:52:13+02:00

  Support for `ghc-stack-profiler`
  
  Instrument GHC to run with `ghc-stack-profiler`
  

• 553f4f9b
  by fendor at 2026-04-03T16:52:13+02:00

  WIP: eventlog-socket support in GHC
  

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• .gitattributes
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• compiler/GHC/Builtin/Names/TH.hs
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• compiler/GHC/Builtin/Types.hs
• compiler/GHC/Builtin/Types/Literals.hs
• compiler/GHC/Builtin/Utils.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• + compiler/GHC/ByteCode/Binary.hs
• compiler/GHC/ByteCode/Breakpoints.hs
• compiler/GHC/ByteCode/InfoTable.hs
• compiler/GHC/ByteCode/Instr.hs
• compiler/GHC/ByteCode/Linker.hs
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• compiler/GHC/ByteCode/Serialize.hs
• compiler/GHC/ByteCode/Types.hs
• compiler/GHC/Cmm.hs
• compiler/GHC/Cmm/BlockId.hs
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• compiler/GHC/Hs/Basic.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• + compiler/GHC/Hs/Decls/Overlap.hs
• compiler/GHC/Hs/Doc.hs
• compiler/GHC/Hs/Doc.hs-boot
• compiler/GHC/Hs/DocString.hs
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Expr.hs-boot
• compiler/GHC/Hs/Extension.hs
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Instances.hs
• compiler/GHC/Hs/Lit.hs
• compiler/GHC/Hs/Pat.hs
• compiler/GHC/Hs/Pat.hs-boot
• 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/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/Decl.hs
• compiler/GHC/HsToCore/Foreign/JavaScript.hs
• compiler/GHC/HsToCore/Foreign/Utils.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/Literal.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc.hs
• compiler/GHC/HsToCore/Pmc/Check.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/Pmc/Types.hs
• compiler/GHC/HsToCore/Pmc/Utils.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/HsToCore/Utils.hs
• compiler/GHC/Iface/Binary.hs
• compiler/GHC/Iface/Decl.hs
• compiler/GHC/Iface/Env.hs
• compiler/GHC/Iface/Errors.hs
• compiler/GHC/Iface/Errors/Ppr.hs
• compiler/GHC/Iface/Errors/Types.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Debug.hs
• compiler/GHC/Iface/Ext/Types.hs
• compiler/GHC/Iface/Ext/Utils.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Make.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/Recomp/Types.hs
• compiler/GHC/Iface/Rename.hs
• compiler/GHC/Iface/Syntax.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Tidy/StaticPtrTable.hs
• compiler/GHC/Iface/Type.hs
• compiler/GHC/Iface/Warnings.hs
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/JS/Ident.hs
• compiler/GHC/JS/JStg/Monad.hs
• compiler/GHC/JS/JStg/Syntax.hs
• compiler/GHC/JS/Make.hs
• compiler/GHC/JS/Optimizer.hs
• compiler/GHC/JS/Ppr.hs
• compiler/GHC/JS/Syntax.hs
• compiler/GHC/JS/Transform.hs
• + compiler/GHC/Linker/ByteCode.hs
• compiler/GHC/Linker/Deps.hs
• compiler/GHC/Linker/Dynamic.hs
• compiler/GHC/Linker/Executable.hs
• compiler/GHC/Linker/Loader.hs
• compiler/GHC/Linker/MacOS.hs
• compiler/GHC/Linker/Types.hs
• compiler/GHC/Linker/Unit.hs
• compiler/GHC/Llvm/MetaData.hs
• compiler/GHC/Llvm/Ppr.hs
• compiler/GHC/Llvm/Types.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/Errors/Basic.hs
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/Lexer.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/Reg/Class.hs
• compiler/GHC/Platform/Reg/Class/NoVectors.hs
• compiler/GHC/Platform/Reg/Class/Separate.hs
• compiler/GHC/Platform/Reg/Class/Unified.hs
• + compiler/GHC/Platform/Tag.hs
• compiler/GHC/Prelude/Basic.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.hs
• compiler/GHC/Rename/Expr.hs-boot
• compiler/GHC/Rename/Fixity.hs
• compiler/GHC/Rename/HsType.hs
• + compiler/GHC/Rename/Lit.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Pat.hs
• compiler/GHC/Rename/Splice.hs
• compiler/GHC/Rename/Splice.hs-boot
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/Rename/Utils.hs
• compiler/GHC/Runtime/Debugger.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Heap/Layout.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Interpreter/C.hs
• compiler/GHC/Runtime/Interpreter/Init.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/Debug.hs
• compiler/GHC/Stg/EnforceEpt.hs
• compiler/GHC/Stg/EnforceEpt/Rewrite.hs
• compiler/GHC/Stg/EnforceEpt/TagSig.hs
• compiler/GHC/Stg/EnforceEpt/Types.hs
• compiler/GHC/Stg/FVs.hs
• compiler/GHC/Stg/Lift/Analysis.hs
• compiler/GHC/Stg/Lift/Monad.hs
• compiler/GHC/Stg/Lift/Types.hs
• compiler/GHC/Stg/Lint.hs
• compiler/GHC/Stg/Pipeline.hs
• compiler/GHC/Stg/Syntax.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/Stg/Utils.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm.hs
• compiler/GHC/StgToCmm/ArgRep.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/CgUtils.hs
• compiler/GHC/StgToCmm/Closure.hs
• compiler/GHC/StgToCmm/Expr.hs
• compiler/GHC/StgToCmm/ExtCode.hs
• compiler/GHC/StgToCmm/Foreign.hs
• compiler/GHC/StgToCmm/InfoTableProv.hs
• compiler/GHC/StgToCmm/Lit.hs
• compiler/GHC/StgToCmm/Monad.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/Utils.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/Arg.hs
• compiler/GHC/StgToJS/CodeGen.hs
• compiler/GHC/StgToJS/DataCon.hs
• compiler/GHC/StgToJS/Deps.hs
• compiler/GHC/StgToJS/Expr.hs
• compiler/GHC/StgToJS/ExprCtx.hs
• compiler/GHC/StgToJS/FFI.hs
• compiler/GHC/StgToJS/Heap.hs
• compiler/GHC/StgToJS/Linker/Linker.hs
• compiler/GHC/StgToJS/Linker/Opt.hs
• compiler/GHC/StgToJS/Linker/Types.hs
• compiler/GHC/StgToJS/Linker/Utils.hs
• compiler/GHC/StgToJS/Literal.hs
• compiler/GHC/StgToJS/Monad.hs
• compiler/GHC/StgToJS/Object.hs
• compiler/GHC/StgToJS/Prim.hs
• compiler/GHC/StgToJS/Rts/Rts.hs
• compiler/GHC/StgToJS/Rts/Types.hs
• compiler/GHC/StgToJS/Sinker/Collect.hs
• compiler/GHC/StgToJS/Sinker/Sinker.hs
• compiler/GHC/StgToJS/Sinker/StringsUnfloat.hs
• compiler/GHC/StgToJS/Types.hs
• compiler/GHC/StgToJS/Utils.hs
• compiler/GHC/SysTools.hs
• compiler/GHC/SysTools/Ar.hs
• compiler/GHC/SysTools/BaseDir.hs
• compiler/GHC/SysTools/Cpp.hs
• compiler/GHC/SysTools/Tasks.hs
• compiler/GHC/SysTools/Terminal.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/Utils.hs
• compiler/GHC/Tc/Errors.hs
• compiler/GHC/Tc/Errors/Hole.hs
• 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/Sig.hs
• compiler/GHC/Tc/Gen/Splice.hs
• 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/Solver.hs
• compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Dict.hs
• compiler/GHC/Tc/Solver/Equality.hs
• compiler/GHC/Tc/Solver/FunDeps.hs
• compiler/GHC/Tc/Solver/InertSet.hs
• compiler/GHC/Tc/Solver/Irred.hs
• compiler/GHC/Tc/Solver/Monad.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/Solver/Solve.hs
• compiler/GHC/Tc/Solver/Types.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/BasicTypes.hs
• compiler/GHC/Tc/Types/Constraint.hs
• compiler/GHC/Tc/Types/CtLoc.hs
• compiler/GHC/Tc/Types/ErrCtxt.hs
• compiler/GHC/Tc/Types/Evidence.hs
• compiler/GHC/Tc/Types/Origin.hs
• compiler/GHC/Tc/Utils/Backpack.hs
• compiler/GHC/Tc/Utils/Env.hs
• compiler/GHC/Tc/Utils/Instantiate.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• − compiler/GHC/Tc/Utils/TcMType.hs-boot
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/Monad.hs
• compiler/GHC/Tc/Zonk/TcType.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Annotations.hs
• + compiler/GHC/Types/Arity.hs
• compiler/GHC/Types/Avail.hs
• compiler/GHC/Types/Basic.hs
• compiler/GHC/Types/CompleteMatch.hs
• compiler/GHC/Types/CostCentre.hs
• compiler/GHC/Types/CostCentre/State.hs
• compiler/GHC/Types/DefaultEnv.hs
• compiler/GHC/Types/Demand.hs
• compiler/GHC/Types/Error.hs
• compiler/GHC/Types/Error/Codes.hs
• compiler/GHC/Types/FieldLabel.hs
• compiler/GHC/Types/Fixity.hs
• compiler/GHC/Types/ForeignCall.hs
• compiler/GHC/Types/ForeignStubs.hs
• compiler/GHC/Types/GREInfo.hs
• compiler/GHC/Types/Hint.hs
• compiler/GHC/Types/Hint/Ppr.hs
• compiler/GHC/Types/Id.hs
• compiler/GHC/Types/Id/Info.hs
• compiler/GHC/Types/Id/Make.hs
• + compiler/GHC/Types/InlinePragma.hs
• compiler/GHC/Types/Literal.hs
• + compiler/GHC/Types/Literal/Floating.hs
• compiler/GHC/Types/Name.hs
• compiler/GHC/Types/Name/Cache.hs
• compiler/GHC/Types/Name/Occurrence.hs
• compiler/GHC/Types/Name/Reader.hs
• compiler/GHC/Types/Name/Set.hs
• compiler/GHC/Types/PkgQual.hs
• compiler/GHC/Types/RepType.hs
• compiler/GHC/Types/SaneDouble.hs
• compiler/GHC/Types/SourceText.hs
• compiler/GHC/Types/SrcLoc.hs
• compiler/GHC/Types/Tickish.hs
• compiler/GHC/Types/TyThing.hs
• compiler/GHC/Types/Unique/DFM.hs
• compiler/GHC/Types/Unique/DSet.hs
• compiler/GHC/Types/Unique/FM.hs
• compiler/GHC/Types/Unique/Map.hs
• compiler/GHC/Types/Unique/SDFM.hs
• compiler/GHC/Types/Unique/Set.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Types/Var/Env.hs
• compiler/GHC/Unit.hs
• compiler/GHC/Unit/Env.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Home/ModInfo.hs
• compiler/GHC/Unit/Home/PackageTable.hs
• compiler/GHC/Unit/Info.hs
• compiler/GHC/Unit/Module.hs
• compiler/GHC/Unit/Module/Deps.hs
• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/Location.hs
• compiler/GHC/Unit/Module/ModIface.hs
• compiler/GHC/Unit/Module/ModSummary.hs
• compiler/GHC/Unit/Module/Status.hs
• compiler/GHC/Unit/Module/Warnings.hs
• compiler/GHC/Unit/Module/WholeCoreBindings.hs
• compiler/GHC/Unit/State.hs
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Unit/Types.hs-boot
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/Binary/Typeable.hs
• compiler/GHC/Utils/Error.hs
• compiler/GHC/Utils/Exception.hs
• compiler/GHC/Utils/Json.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Misc.hs
• compiler/GHC/Utils/Monad.hs
• compiler/GHC/Utils/Monad/Codensity.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Panic.hs
• compiler/GHC/Utils/Panic/Plain.hs
• compiler/GHC/Utils/Ppr/Colour.hs
• compiler/GHC/Utils/Trace.hs
• compiler/GHC/Wasm/ControlFlow.hs
• compiler/GHC/Wasm/ControlFlow/FromCmm.hs
• compiler/Language/Haskell/Syntax.hs
• compiler/Language/Haskell/Syntax/Basic.hs
• compiler/Language/Haskell/Syntax/Binds.hs
• + compiler/Language/Haskell/Syntax/Binds/InlinePragma.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• + compiler/Language/Haskell/Syntax/Decls/Foreign.hs
• + compiler/Language/Haskell/Syntax/Decls/Overlap.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/Expr.hs-boot
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Lit.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• compiler/Language/Haskell/Syntax/Pat.hs-boot
• compiler/Language/Haskell/Syntax/Type.hs
• compiler/ghc.cabal.in
• config.guess
• config.sub
• configure.ac
• distrib/configure.ac.in
• − docs/Makefile
• − docs/storage-mgt/Makefile
• + docs/users_guide/10.0.1-notes.rst
• docs/users_guide/9.16.1-notes.rst
• − docs/users_guide/Makefile
• docs/users_guide/conf.py
• docs/users_guide/eventlog-formats.rst
• docs/users_guide/exts/control.rst
• docs/users_guide/exts/data_kinds.rst
• docs/users_guide/exts/explicit_namespaces.rst
• docs/users_guide/exts/gadt_syntax.rst
• docs/users_guide/exts/multiway_if.rst
• docs/users_guide/exts/pragmas.rst
• + docs/users_guide/exts/qualified_strings.rst
• docs/users_guide/exts/rank_polymorphism.rst
• docs/users_guide/exts/recursive_do.rst
• docs/users_guide/exts/required_type_arguments.rst
• docs/users_guide/exts/rewrite_rules.rst
• docs/users_guide/exts/roles.rst
• docs/users_guide/exts/table.rst
• docs/users_guide/exts/type_families.rst
• docs/users_guide/ghci.rst
• docs/users_guide/index.rst
• docs/users_guide/packages.rst
• docs/users_guide/phases.rst
• docs/users_guide/rtd-theme/layout.html
• docs/users_guide/runtime_control.rst
• docs/users_guide/using-concurrent.rst
• docs/users_guide/using-optimisation.rst
• docs/users_guide/using.rst
• docs/users_guide/utils.py
• docs/users_guide/wasm.rst
• docs/users_guide/win32-dlls.rst
• − driver/Makefile
• − driver/ghc/Makefile
• − driver/ghci/Makefile
• driver/ghci/ghci.c
• − driver/haddock/Makefile
• driver/utils/cwrapper.c
• driver/utils/isMinTTY.c
• − driver/utils/merge_sections.ld
• − driver/utils/merge_sections_pe.ld
• + eventlog-socket
• + ghc-stack-profiler
• 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/Main.hs
• − ghc/Makefile
• ghc/ghc-bin.cabal.in
• hadrian/README.md
• hadrian/bindist/cwrappers/cwrapper.c
• hadrian/bootstrap/generate_bootstrap_plans
• hadrian/bootstrap/plan-9_10_1.json
• hadrian/bootstrap/plan-9_10_2.json
• + hadrian/bootstrap/plan-9_10_3.json
• hadrian/bootstrap/plan-9_12_1.json
• hadrian/bootstrap/plan-9_12_2.json
• + hadrian/bootstrap/plan-9_14_1.json
• hadrian/bootstrap/plan-bootstrap-9_10_1.json
• hadrian/bootstrap/plan-bootstrap-9_10_2.json
• + hadrian/bootstrap/plan-bootstrap-9_10_3.json
• hadrian/bootstrap/plan-bootstrap-9_12_1.json
• hadrian/bootstrap/plan-bootstrap-9_12_2.json
• + hadrian/bootstrap/plan-bootstrap-9_14_1.json
• hadrian/cabal.project
• hadrian/cfg/default.host.target.in
• hadrian/cfg/default.target.in
• hadrian/doc/flavours.md
• hadrian/doc/user-settings.md
• hadrian/hadrian.cabal
• hadrian/src/Base.hs
• hadrian/src/Builder.hs
• hadrian/src/CommandLine.hs
• hadrian/src/Context.hs
• hadrian/src/Flavour.hs
• hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
• hadrian/src/Hadrian/Haskell/Cabal/Type.hs
• hadrian/src/Hadrian/Haskell/Hash.hs
• hadrian/src/Hadrian/Oracles/ArgsHash.hs
• hadrian/src/Hadrian/Oracles/Cabal/Type.hs
• hadrian/src/Hadrian/Oracles/DirectoryContents.hs
• hadrian/src/Hadrian/Oracles/Path.hs
• hadrian/src/Hadrian/Oracles/TextFile.hs
• hadrian/src/Hadrian/Utilities.hs
• hadrian/src/Main.hs
• hadrian/src/Oracles/Flag.hs
• hadrian/src/Oracles/Flavour.hs
• hadrian/src/Oracles/ModuleFiles.hs
• hadrian/src/Oracles/Setting.hs
• hadrian/src/Packages.hs
• hadrian/src/Rules.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
• hadrian/src/Rules/Compile.hs
• hadrian/src/Rules/Docspec.hs
• hadrian/src/Rules/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Gmp.hs
• − hadrian/src/Rules/Libffi.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Lint.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Register.hs
• hadrian/src/Rules/Rts.hs
• hadrian/src/Rules/SourceDist.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/Cc.hs
• hadrian/src/Settings/Builders/Configure.hs
• hadrian/src/Settings/Builders/GenPrimopCode.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Builders/Hsc2Hs.hs
• hadrian/src/Settings/Builders/Make.hs
• − hadrian/src/Settings/Builders/MergeObjects.hs
• hadrian/src/Settings/Builders/RunTest.hs
• hadrian/src/Settings/Builders/SplitSections.hs
• hadrian/src/Settings/Default.hs
• − hadrian/src/Settings/Flavours/Benchmark.hs
• hadrian/src/Settings/Flavours/Development.hs
• hadrian/src/Settings/Flavours/GhcInGhci.hs
• hadrian/src/Settings/Flavours/Performance.hs
• hadrian/src/Settings/Flavours/Quick.hs
• hadrian/src/Settings/Flavours/QuickCross.hs
• hadrian/src/Settings/Flavours/Quickest.hs
• hadrian/src/Settings/Flavours/Validate.hs
• hadrian/src/Settings/Packages.hs
• hadrian/src/Settings/Program.hs
• hadrian/src/Settings/Warnings.hs
• hadrian/stack.yaml
• − libffi-tarballs
• libraries/Cabal
• − libraries/Makefile
• + libraries/async
• libraries/base/base.cabal.in
• libraries/base/changelog.md
• libraries/base/src/Control/Applicative.hs
• libraries/base/src/Control/Arrow.hs
• libraries/base/src/Control/Concurrent.hs
• libraries/base/src/Data/Array/Byte.hs
• libraries/base/src/Data/Bifoldable1.hs
• libraries/base/src/Data/Bool.hs
• libraries/base/src/Data/Char.hs
• libraries/base/src/Data/Eq.hs
• libraries/base/src/Data/Ix.hs
• libraries/base/src/Data/List.hs
• libraries/base/src/Data/List/NubOrdSet.hs
• libraries/base/src/Data/Semigroup.hs
• libraries/base/src/GHC/Base.hs
• libraries/base/src/GHC/Conc.hs
• libraries/base/src/GHC/Conc/Sync.hs
• − libraries/base/src/GHC/Desugar.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/Fingerprint.hs
• − libraries/base/src/GHC/JS/Prim/Internal/Build.hs
• libraries/base/src/GHC/Num.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/ResponseFile.hs
• libraries/base/src/GHC/Stats.hs
• libraries/base/src/GHC/Unicode.hs
• libraries/base/src/GHC/Weak.hs
• libraries/base/src/GHC/Weak/Finalize.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/System/CPUTime/Utils.hs
• libraries/base/src/System/Exit.hs
• libraries/base/src/System/IO.hs
• + libraries/base/src/System/IO/OS.hs
• libraries/base/src/System/Info.hs
• libraries/base/src/System/Mem/Weak.hs
• libraries/base/src/System/Timeout.hs
• libraries/base/tests/IO/T12010/cbits/initWinSock.c
• libraries/base/tests/IO/T17912.hs
• libraries/base/tests/IO/T18832.hs
• libraries/base/tests/IO/all.T
• + libraries/base/tests/IO/osHandles001FileDescriptors.hs
• + libraries/base/tests/IO/osHandles001FileDescriptors.stdout
• + libraries/base/tests/IO/osHandles001WindowsHandles.hs
• + libraries/base/tests/IO/osHandles001WindowsHandles.stdout
• + libraries/base/tests/IO/osHandles002FileDescriptors.hs
• + libraries/base/tests/IO/osHandles002FileDescriptors.stderr
• + libraries/base/tests/IO/osHandles002FileDescriptors.stdin
• + libraries/base/tests/IO/osHandles002FileDescriptors.stdout
• + libraries/base/tests/IO/osHandles002WindowsHandles.hs
• + libraries/base/tests/IO/osHandles002WindowsHandles.stderr
• + libraries/base/tests/IO/osHandles002WindowsHandles.stdin
• + libraries/base/tests/IO/osHandles002WindowsHandles.stdout
• libraries/base/tests/T23454.stderr
• libraries/base/tests/perf/Makefile
• libraries/deepseq
• libraries/directory
• libraries/exceptions
• libraries/ghc-bignum/ghc-bignum.cabal
• libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
• libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
• libraries/ghc-boot/GHC/Data/SizedSeq.hs
• compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs
• libraries/ghc-boot/GHC/Unit/Database.hs
• libraries/ghc-boot/ghc-boot.cabal.in
• libraries/ghc-compact/tests/all.T
• libraries/ghc-experimental/CHANGELOG.md
• libraries/ghc-experimental/ghc-experimental.cabal.in
• libraries/ghc-experimental/src/GHC/Exception/Backtrace/Experimental.hs
• libraries/ghc-experimental/src/GHC/Profiling/Eras.hs
• libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs
• + libraries/ghc-experimental/src/GHC/Stack/Decode/Experimental.hs
• libraries/ghc-experimental/src/GHC/TypeNats/Experimental.hs
• + libraries/ghc-experimental/tests/Makefile
• libraries/base/src/GHC/Weak/Finalizehs → libraries/ghc-experimental/tests/all.T
• + libraries/ghc-experimental/tests/backtraces/Makefile
• + libraries/ghc-experimental/tests/backtraces/T26806a.hs
• + libraries/ghc-experimental/tests/backtraces/T26806a.stderr
• + libraries/ghc-experimental/tests/backtraces/T26806b.hs
• + libraries/ghc-experimental/tests/backtraces/T26806b.stderr
• + libraries/ghc-experimental/tests/backtraces/T26806c.hs
• + libraries/ghc-experimental/tests/backtraces/T26806c.stderr
• + libraries/ghc-experimental/tests/backtraces/all.T
• libraries/ghc-heap/GHC/Exts/Heap/Closures.hs
• libraries/ghc-internal/CHANGELOG.md
• libraries/ghc-internal/cbits/Stack.cmm
• libraries/ghc-internal/cbits/consUtils.c
• libraries/ghc-internal/codepages/MakeTable.hs
• libraries/ghc-internal/configure.ac
• libraries/ghc-internal/ghc-internal.buildinfo.in
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/include/HsIntegerGmp.h.in
• libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
• libraries/ghc-internal/src/GHC/Internal/Arr.hs
• libraries/ghc-internal/src/GHC/Internal/Base.hs
• libraries/ghc-internal/src/GHC/Internal/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
• − libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs-boot
• libraries/ghc-internal/src/GHC/Internal/CString.hs
• libraries/ghc-internal/src/GHC/Internal/Char.hs
• libraries/ghc-internal/src/GHC/Internal/Classes.hs
• + libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
• libraries/ghc-internal/src/GHC/Internal/Clock.hsc
• libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
• − libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Conc/Windows.hs
• libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
• libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Concurrent/MVar.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fail.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fix.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/IO/Class.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Bits.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Bool.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Dynamic.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Either.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Eq.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Utils.hs
• libraries/ghc-internal/src/GHC/Internal/Data/IORef.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Ix.hs
• libraries/ghc-internal/src/GHC/Internal/Data/List.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
• libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Ord.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
• libraries/ghc-internal/src/GHC/Internal/Data/STRef.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Semigroup/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Data/String.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Coercion.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Equality.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Typeable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Unique.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Version.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs
• libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Encoding/UTF8.hs
• libraries/ghc-internal/src/GHC/Internal/Enum.hs
• libraries/ghc-internal/src/GHC/Internal/Environment.hs
• libraries/ghc-internal/src/GHC/Internal/Err.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Array.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
• libraries/ghc-internal/src/GHC/Internal/Event/EPoll.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/IntVar.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Internal/Types.hs
• libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Manager.hs
• libraries/ghc-internal/src/GHC/Internal/Event/PSQ.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Poll.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Event/TimeOut.hs
• libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Unique.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/Clock.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/ConsoleEvent.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/FFI.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/ManagedThreadPool.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
• libraries/ghc-internal/src/GHC/Internal/ExecutionStack.hs
• libraries/ghc-internal/src/GHC/Internal/ExecutionStack/Internal.hsc
• libraries/ghc-internal/src/GHC/Internal/Exts.hs
• libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs
• libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Fingerprint/Type.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/ConstPtr.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/String.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/Foreign/ForeignPtr/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Alloc.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Array.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Error.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Pool.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Utils.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Ptr.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Storable.hs
• libraries/ghc-internal/src/GHC/Internal/ForeignPtr.hs
• libraries/ghc-internal/src/GHC/Internal/ForeignSrcLang.hs
• libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs
• libraries/ghc-internal/src/GHC/Internal/GHCi.hs
• libraries/ghc-internal/src/GHC/Internal/GHCi/Helpers.hs
• libraries/ghc-internal/src/GHC/Internal/Generics.hs
• libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
• libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc
• libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable/Types.hsc
• libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc
• libraries/ghc-internal/src/GHC/Internal/Heap/ProfInfo/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Buffer.hs
• libraries/ghc-internal/src/GHC/Internal/IO/BufferedIO.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Device.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/API.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/Table.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Failure.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Iconv.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Latin1.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF16.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF32.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF8.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/FD.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Internals.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Flock.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/LinuxOFD.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/NoOp.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
• − libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Windows.hs
• libraries/ghc-internal/src/GHC/Internal/IO/IOMode.hs
• libraries/ghc-internal/src/GHC/Internal/IO/SubSystem.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Unsafe.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Windows/Encoding.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
• libraries/ghc-internal/src/GHC/Internal/IOArray.hs
• libraries/ghc-internal/src/GHC/Internal/IORef.hs
• libraries/ghc-internal/src/GHC/Internal/InfoProv.hs
• libraries/ghc-internal/src/GHC/Internal/InfoProv/Types.hsc
• libraries/ghc-internal/src/GHC/Internal/Int.hs
• libraries/ghc-internal/src/GHC/Internal/IsList.hs
• libraries/ghc-internal/src/GHC/Internal/Ix.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Foreign/Callback.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Prim.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal.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/Lexeme.hs
• libraries/ghc-internal/src/GHC/Internal/List.hs
• libraries/ghc-internal/src/GHC/Internal/MVar.hs
• libraries/ghc-internal/src/GHC/Internal/Magic.hs
• libraries/ghc-internal/src/GHC/Internal/Num.hs
• libraries/ghc-internal/src/GHC/Internal/Numeric.hs
• libraries/ghc-internal/src/GHC/Internal/OverloadedLabels.hs
• libraries/ghc-internal/src/GHC/Internal/Pack.hs
• + libraries/ghc-internal/src/GHC/Internal/Prim.hs
• libraries/ghc-internal/src/GHC/Internal/Profiling.hs
• libraries/ghc-internal/src/GHC/Internal/Ptr.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/ResponseFile.hs
• libraries/ghc-internal/src/GHC/Internal/ST.hs
• + libraries/ghc-internal/src/GHC/Internal/STM.hs
• libraries/ghc-internal/src/GHC/Internal/STRef.hs
• libraries/ghc-internal/src/GHC/Internal/Show.hs
• libraries/ghc-internal/src/GHC/Internal/Stable.hs
• libraries/ghc-internal/src/GHC/Internal/StableName.hs
• libraries/ghc-internal/src/GHC/Internal/Stack.hs
• libraries/ghc-internal/src/GHC/Internal/Stack.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Stack/Annotation.hs
• libraries/ghc-internal/src/GHC/Internal/Stack/CCS.hsc
• libraries/ghc-internal/src/GHC/Internal/Stack/CloneStack.hs
• libraries/ghc-internal/src/GHC/Internal/Stack/Constants.hsc
• libraries/ghc-internal/src/GHC/Internal/Stack/ConstantsProf.hsc
• libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
• libraries/ghc-internal/src/GHC/Internal/StaticPtr.hs
• libraries/ghc-internal/src/GHC/Internal/StaticPtr/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Stats.hsc
• libraries/ghc-internal/src/GHC/Internal/Storable.hs
• libraries/ghc-internal/src/GHC/Internal/System/Environment.hs
• libraries/ghc-internal/src/GHC/Internal/System/Environment/Blank.hsc
• libraries/ghc-internal/src/GHC/Internal/System/Environment/ExecutablePath.hsc
• − libraries/ghc-internal/src/GHC/Internal/System/Exit.hs
• libraries/ghc-internal/src/GHC/Internal/System/IO.hs
• libraries/ghc-internal/src/GHC/Internal/System/IO/Error.hs
• libraries/ghc-internal/src/GHC/Internal/System/Mem.hs
• libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
• libraries/ghc-internal/src/GHC/Internal/System/Posix/Types.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
• − libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs
• libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadP.hs
• libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadPrec.hs
• libraries/ghc-internal/src/GHC/Internal/Text/Read.hs
• libraries/ghc-internal/src/GHC/Internal/Text/Read/Lex.hs
• libraries/ghc-internal/src/GHC/Internal/TopHandler.hs
• libraries/ghc-internal/src/GHC/Internal/Tuple.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-internal/src/GHC/Internal/Unicode.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/DerivedCoreProperties.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/GeneralCategory.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleLowerCaseMapping.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleTitleCaseMapping.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleUpperCaseMapping.hs
• libraries/ghc-internal/src/GHC/Internal/Unicode/Version.hs
• libraries/ghc-internal/src/GHC/Internal/Unsafe/Coerce.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Conc.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Conc/Internal.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/Weak.hs
• libraries/ghc-internal/src/GHC/Internal/Weak/Finalize.hs
• libraries/ghc-internal/src/GHC/Internal/Windows.hs
• libraries/ghc-internal/src/GHC/Internal/Word.hs
• + libraries/ghc-internal/tests/backtraces/T15395.hs
• + libraries/ghc-internal/tests/backtraces/T15395.stdout
• libraries/ghc-internal/tests/backtraces/all.T
• libraries/ghc-internal/tests/stack-annotation/all.T
• libraries/ghc-internal/tests/stack-annotation/ann_frame001.stdout
• libraries/ghc-internal/tests/stack-annotation/ann_frame002.stdout
• libraries/ghc-internal/tests/stack-annotation/ann_frame003.stdout
• libraries/ghc-internal/tests/stack-annotation/ann_frame004.stdout
• + libraries/ghc-internal/tests/stack-annotation/ann_frame005.hs
• + libraries/ghc-internal/tests/stack-annotation/ann_frame005.stdout
• libraries/ghc-internal/tools/ucd2haskell/exe/UCD2Haskell/ModuleGenerators.hs
• libraries/ghc-platform/src/GHC/Platform/ArchOS.hs
• − libraries/ghci/GHCi/BinaryArray.hs
• libraries/ghci/GHCi/CreateBCO.hs
• libraries/ghci/GHCi/Message.hs
• libraries/ghci/GHCi/ResolvedBCO.hs
• libraries/ghci/GHCi/Run.hs
• libraries/ghci/GHCi/Server.hs
• libraries/ghci/ghci.cabal.in
• + libraries/hashable
• libraries/haskeline
• + libraries/libffi-clib
• libraries/mtl
• libraries/template-haskell-quasiquoter
• libraries/template-haskell/Language/Haskell/TH/Quote.hs
• libraries/template-haskell/Language/Haskell/TH/Syntax.hs
• libraries/template-haskell/vendored-filepath/System/FilePath/Posix.hs
• libraries/template-haskell/vendored-filepath/System/FilePath/Windows.hs
• libraries/text
• libraries/transformers
• + libraries/unordered-containers
• libraries/xhtml
• linters/lint-codes/LintCodes/Static.hs
• − linters/lint-codes/Makefile
• − linters/lint-notes/Makefile
• llvm-passes
• llvm-targets
• − m4/find_ghc_bootstrap_prog.m4
• − m4/fp_check_timer_create.m4
• m4/fp_cmm_cpp_cmd_with_args.m4
• − m4/fp_copy_shellvar.m4
• + m4/fp_linker_supports_verbatim.m4
• m4/fp_prog_cc_linker_target.m4
• − m4/fp_prog_ld_flag.m4
• − m4/fp_prog_sort.m4
• m4/fptools_happy.m4
• m4/ghc_select_file_extensions.m4
• m4/prep_target_file.m4
• mk/system-cxx-std-lib-1.0.conf.in
• − mk/win32-tarballs.md5sum
• nofib
• packages
• + rts/.ubsan-suppressions
• rts/AllocArray.c
• rts/AllocArray.h
• rts/Apply.cmm
• rts/CloneStack.c
• rts/CloneStack.h
• rts/ClosureTable.c
• rts/Compact.cmm
• rts/Continuation.c
• rts/ContinuationOps.cmm
• rts/Exception.cmm
• rts/Heap.c
• rts/HeapStackCheck.cmm
• rts/IOManager.c
• rts/Interpreter.c
• rts/Jumps.h
• rts/Linker.c
• rts/LinkerInternals.h
• − rts/Makefile
• rts/Messages.c
• rts/PrimOps.cmm
• rts/Printer.c
• rts/RaiseAsync.c
• rts/RtsFlags.c
• rts/RtsMessages.c
• rts/RtsSymbols.c
• rts/STM.c
• rts/STM.h
• rts/Schedule.c
• rts/Stats.c
• rts/StgCRun.c
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• testsuite/tests/javascript/all.T
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• testsuite/tests/module/all.T
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