Wolfgang Jeltsch pushed to branch wip/jeltsch/control-monad-zip-to-base at Glasgow Haskell Compiler / GHC

Commits:

• 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.
  

• 58009c14
  by Apoorv Ingle at 2026-04-02T09:51:24+01:00

  Streamline expansions using HsExpansion (#25001)
  
  Notes added [Error Context Stack] [Typechecking by expansion: overview]
  Notes updated Note [Expanding HsDo with XXExprGhcRn] [tcApp: typechecking applications]
  
  -------------------------
  Metric Decrease:
      T9020
  -------------------------
  
  There are 2 key changes:
  
  1. `HsExpand` datatype mediates between expansions
  2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`
  
  This has some consequences detailed below:
  
  1. `HsExpand` datatype mediates between expansions
     * Simplifies the implementations of `tcExpr` to work on `XExpr`
     * Removes `VACtxt` (and its associated `VAExpansion` and `VACall`) datatype, it is subsumed by simply a `SrcSpan`.
     * Removes the function `addHeadCtxt` as it is now mearly setting a location
     * The function `tcValArgs` does its own argument number management
     * move `splitHsTypes` out of `tcApp`
     * Removes special case of tcBody from `tcLambdaMatches`
     * Removes special case of `dsExpr` for `ExpandedThingTc`
     * Renames `tcMonoExpr` -> `tcMonoLExpr`, `tcMonoExprNC` -> `tcMonoLExpr`
     * Renames `EValArg`, `EValArgQL` fields: `ea_ctxt` -> `ea_loc_span` and `eaql_ctx` -> `eaql_loc_span`
     * Remove `PopErrCtxt` from `XXExprGhcRn`
     * `fun_orig` in tcInstFun depends on the SrcSpan of the head of the application chain (similar to addArgCtxt)
       - it references the application chain head if it is user located, or
        uses the error context stack  as a fallback if it's a generated
        location
     * Make a new variant `GeneratedSrcSpan` in `SrcSpan` for HIEAst Nodes
      - Expressions wrapped around `GeneratedSrcSpan` are ignored and never added to the error context stack
      - In Explicit list expansion `fromListN` is wrapped with a `GeneratedSrcSpan` with `GeneratedSrcSpanDetails` field to store the original srcspan
  
  2. Replace `ErrCtxtM` to a simpler `HsCtxt` that does not depend on a `TidyEnv`
     * Merge `HsThingRn` to `HsCtxt`
     * Landmark Error messages are now just computed on the fly
     * Make HsExpandedRn and HsExpandedTc payload a located HsExpr GhcRn
     * `HsCtxt` are tidied and zonked at the end right before printing
  
  Co-authored-by: simonpj <simon.peytonjones@gmail.com>
  

• bc4b4487
  by Zubin Duggal at 2026-04-03T14:22:27-04:00

  driver: recognise .dyn_o as a valid object file to link if passed on the command line.
  This allows plugins compiled with this suffix to run.
  
  Fixes #24486
  

• 5ebb9121
  by Simon Jakobi at 2026-04-03T14:23:11-04:00

  Add regression test for #16145
  
  Closes #16145.
  

• c1fc1c44
  by Simon Peyton Jones at 2026-04-03T19:56:07-04:00

  Refactor eta-expansion in Prep
  
  The Prep pass does eta-expansion but I found cases where it was
  doing bad things.  So I refactored and simplified it quite a bit.
  
  In the new design
  * There is no distinction between `rhs` and `body`; in particular,
    lambdas can now appear anywhere, rather than just as the RHS of
    a let-binding.
  
  * This change led to a significant simplification of Prep, and
    a more straightforward explanation of eta-expansion. See the new
       Note [Eta expansion]
  
  * The consequences is that CoreToStg needs to handle naked lambdas.
    This is very easy; but it does need a unique supply, which forces
    some simple refactoring.  Having a unique supply to hand is probably
    a good thing anyway.
  

• 21beda2c
  by Simon Peyton Jones at 2026-04-03T19:56:07-04:00

  Clarify Note [Interesting dictionary arguments]
  
  Ticket #26831 ended up concluding that the code for
  GHC.Core.Opt.Specialise.interestingDict was good, but the
  commments were a bit inadequate.
  
  This commit improves the comments slightly.
  

• 3eaac1f2
  by Simon Peyton Jones at 2026-04-03T19:56:07-04:00

  Make inlining a bit more eager for overloaded functions
  
  If we have
     f d = ... (class-op d x y) ...
  we should be eager to inline `f`, because that may change the
  higher order call (class-op d x y) into a call to a statically
  known function.
  
  See the discussion on #26831.
  
  Even though this does a bit /more/ inlining, compile times
  decrease by an average of 0.4%.
  
  Compile time changes:
  
   DsIncompleteRecSel3(normal)     431,786,104  -2.2%
      ManyAlternatives(normal)     670,883,768  -1.6%
      ManyConstructors(normal)   3,758,493,832  -2.6% GOOD
  MultilineStringsPerf(normal)      29,900,576  -2.8%
              T14052Type(ghci)   1,047,600,848  -1.2%
                T17836(normal)     392,852,328  -5.2%
                T18478(normal)     442,785,768  -1.4%
               T21839c(normal)     341,536,992 -14.1% GOOD
                 T3064(normal)     174,086,152  +5.3%  BAD
                 T5631(normal)     506,867,800  +1.0%
        hard_hole_fits(normal)     209,530,736  -1.3%
   info_table_map_perf(normal)  19,523,093,184  -1.2%
            parsing001(normal)     377,810,528  -1.1%
            pmcOrPats(normal)       60,075,264  -0.5%
  
                                   geo. mean    -0.4%
                                   minimum     -14.1%
                                   maximum      +5.3%
  
  Runtime changes
      haddock.Cabal(normal)   27,351,988,792  -0.7%
       haddock.base(normal)   26,997,212,560  -0.6%
   haddock.compiler(normal)  219,531,332,960  -1.0%
  
  Metric Decrease:
      LinkableUsage01
      ManyConstructors
      T17949
      T21839c
      T13035
      TcPlugin_RewritePerf
      hard_hole_fits
  
  Metric Increase:
      T3064
  

• 5cbc2c82
  by Matthew Pickering at 2026-04-03T19:57:02-04:00

  bytecode: Add magic header/version to bytecode files
  
  In order to avoid confusing errors when using stale interface files (ie
  from an older compiler version), we add a simple header/version check
  like the one for interface files.
  
  Fixes #27068
  

• d95a1936
  by fendor at 2026-04-03T19:57:02-04:00

  Add constants for bytecode in-memory buffer size
  
  Introduce a common constant for the default size of the .gbc and
  .bytecodelib binary buffer.
  
  The buffer is by default set to 1 MB.
  

• b822c30a
  by mangoiv at 2026-04-03T19:57:49-04:00

  testsuite: filter stderr for static001 on darwin
  
  This reactivates the test on x86_64 darwin as this should have been done
  long ago and ignores warnings emitted by ranlib on newer version of the
  darwin toolchain since they are benign. (no symbols for stub libraries)
  
  Fixes #27116
  

• 28ce1f8a
  by Andreas Klebinger at 2026-04-03T19:58:44-04:00

  Give the Data instance for ModuleName a non-bottom toConstr implementation.
  
  I've also taken the liberty to add Note [Data.Data instances for GHC AST Types]
  describing some of the uses of Data.Data I could find.
  
  Fixes #27129
  

• 8ca41ffe
  by mangoiv at 2026-04-03T19:59:30-04:00

  issue template: fix add bug label
  

• 3981db0c
  by Sylvain Henry at 2026-04-03T20:00:33-04:00

  Add more canned GC functions for common register patterns (#27142)
  
  Based on analysis of heap-check sites across the GHC compiler and Cabal,
  the following patterns were not covered by existing canned GC functions
  but occurred frequently enough to warrant specialisation:
  
    stg_gc_ppppp  -- 5 GC pointers
    stg_gc_ip     -- unboxed word + GC pointer
    stg_gc_pi     -- GC pointer + unboxed word
    stg_gc_ii     -- two unboxed words
    stg_gc_bpp    -- byte (I8) + two GC pointers
  
  Adding these reduces the fraction of heap-check sites falling back to
  the generic GC path from ~1.4% to ~0.4% when compiling GHC itself.
  
  Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
  

• d17d1435
  by Matthew Pickering at 2026-04-03T20:01:19-04:00

  Make home unit dependencies stored as sets
  
  Co-authored-by: Wolfgang Jeltsch <wolfgang@well-typed.com>
  

• 92a97015
  by Simon Peyton Jones at 2026-04-05T00:58:57+01:00

  Add Invariant (NoTypeShadowing) to Core
  
  This commit addresses #26868, by adding
  a new invariant (NoTypeShadowing) to Core.
  
  See Note [No type-shadowing in Core] in GHC.Core
  

• 8b5a5020
  by Simon Peyton Jones at 2026-04-05T00:58:57+01:00

  Major refactor of free-variable functions
  
  For some time we have had two free-variable mechanims for types:
  
  * The "FV" mechanism, embodied in GHC.Utils.FV, which worked OK, but
    was fragile where eta-expansion was concerned.
  
  * The TyCoFolder mechanism, using a one-shot EndoOS accumulator
  
  I finally got tired of this and refactored the whole thing, thereby
  addressing #27080.   Now we have
  
  * `GHC.Types.Var.FV`, which has a composable free-variable result type,
    very much in the spirit of the old `FV`, but much more robust.
    (It uses the "one shot trick".)
  
  * GHC.Core.TyCo.FVs now has just one technology for free variables.
  
  All this led to a lot of renaming.
  
  There are couple of error-message changes.  The change in T18451
  makes an already-poor error message even more mysterious.  But
  it really needs a separate look.
  
  We also now traverse the AST in a different order leading to a different
  but still deterministic order for FVs and test output has been adjusted
  accordingly.
  

• 4bf040c6
  by sheaf at 2026-04-05T14:56:29-04:00

  Add utility pprTrace_ function
  
  This function is useful for quick debugging, as it can be added to a
  where clause to pretty-print debugging information:
  
    fooBar x y
      | cond      = body1
      | otherwise = body2
      where
        !_ = pprTrace_ "fooBar" $
             vcat [ text "x:" <+> ppr x
                  , text "y:" <+> ppr y
                  , text "cond:" <+> ppr cond
                  ]
  

• 502e6ffe
  by Andrew Lelechenko at 2026-04-07T04:47:21-04:00

  base: improve error message for Data.Char.chr
  
  As per https://github.com/haskell/core-libraries-committee/issues/384
  

• b21bd52e
  by Simon Peyton Jones at 2026-04-07T04:48:07-04:00

  Refactor FunResCtxt a bit
  
  Fixes #27154
  

• 7fe84ea5
  by Zubin Duggal at 2026-04-07T19:11:52+05:30

  compiler: Warn when -finfo-table-map is used with -fllvm
  
  These are currently not supported together.
  
  Fixes #26435
  

• 4a45a7da
  by Matthew Pickering at 2026-04-08T04:37:29-04:00

  packaging: correctly propagate build/host/target to bindist configure script
  
  At the moment the host and target which we will produce a compiler for
  is fixed at the initial configure time. Therefore we need to persist
  the choice made at this time into the installation bindist as well so we
  look for the right tools, with the right prefixes at install time.
  
  In the future, we want to provide a bit more control about what kind of
  bindist we produce so the logic about what the host/target will have to
  be written by hadrian rather than persisted by the configure script. In
  particular with cross compilers we want to either build a normal stage 2
  cross bindist or a stage 3 bindist, which creates a bindist which has a
  native compiler for the target platform.
  
  Fixes #21970
  
  Co-authored-by: Sven Tennie <sven.tennie@gmail.com>
  

• b0950df6
  by Sven Tennie at 2026-04-08T04:37:29-04:00

  Cross --host and --target no longer required for cross (#21970)
  
  We set sane defaults in the configure script. Thus, these paramenters
  aren't required any longer.
  

• fef35216
  by Sven Tennie at 2026-04-08T04:37:30-04:00

  ci: Define USER_CONF_CC_OPTS_STAGE2 for aarch64/mingw
  
  ghc-toolchain doesn't see $CONF_CC_OPTS_STAGE2 when the bindist gets
  configured. So, the hack to override the compiler gets lost.
  

• 8dd6f453
  by Cheng Shao at 2026-04-08T04:38:11-04:00

  ghci: use ShortByteString for LookupSymbol/LookupSymbolInDLL/LookupClosure messages
  
  This patch refactors ghci to use `ShortByteString` for
  `LookupSymbol`/`LookupSymbolInDLL`/`LookupClosure` messages as the
  first part of #27147.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 371ef200
  by Cheng Shao at 2026-04-08T04:38:11-04:00

  ghci: use ShortByteString for MkCostCentres message
  
  This patch refactors ghci to use `ShortByteString` for `MkCostCentres`
  messages as a first part of #27147. This also considerably lowers the
  memory overhead of breakpoints when cost center profiling is enabled.
  
  -------------------------
  Metric Decrease:
      interpreter_steplocal
  -------------------------
  
  Co-authored-by: Codex <codex@openai.com>
  

• 4a122bb6
  by Phil Hazelden at 2026-04-08T20:49:42-04:00

  Implement modifiers syntax.
  
  The `%m` syntax of linear types is now accepted in more places, to allow
  use by future extensions, though so far linear types is still the only
  consumer.
  
  This may break existing code where it
  
  * Uses -XLinearTypes.
  * Has code of the form `a %m -> b`, where `m` can't be inferred to be
    kind Multiplicity.
  
  The code can be fixed either by adding a kind annotation, or by setting
  `-XLinearTypes -XNoModifiers`.
  
  Proposal:
  https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0370-modifiers.rst
  

• 07267f79
  by Zubin Duggal at 2026-04-08T20:50:25-04:00

  hadrian: Don't include the package hash in the haddock directory
  
  Since GHC 9.8 and hash_unit_ids, haddock urls have looked like`ghc-9.10.3/doc/html/libraries/base-4.20.2.0-39f9/**/*.html`
  
  The inclusion of the hash makes it hard for downstream non-boot packages to properly link to these files, as the hash is not
  part of a standard cabal substitution.
  
  Since we only build one version of each package, we don't need the hash to disambiguate anything, we can just remove it.
  
  Fixes #26635
  

• 0a83b95b
  by ARATA Mizuki at 2026-04-08T20:51:18-04:00

  testsuite: Allow multiple ways to be run by setting multiple command-line options
  
  This patch allows multiple `--test-way`s to take effect, like:
  
  $ hadrian/build test --test-way=normal --test-way=llvm
  
  Previously, only one way was run if the test speed was 'normal' or 'fast'.
  
  Closes #26926
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• e841931c
  by Teo Camarasu at 2026-04-08T20:52:00-04:00

  doc: improve eventlog-flush-interval flag documentation
  
  We mention the performance cost and how this flag can be turned off.
  
  Resolves #27056
  

• e332db25
  by Teo Camarasu at 2026-04-08T20:52:01-04:00

  docs/user_guide: fix typo
  

• 5b82080a
  by Simon Jakobi at 2026-04-08T20:52:44-04:00

  Fix -dsuppress-uniques for free variables in demand signatures
  
  Before:          Str=b{sXyZ->S}
  With this patch: Str=b{S}
  
  T13143.stderr is updated accordingly.
  
  Fixes #27106.
  

• b7a084cc
  by Simon Jakobi at 2026-04-08T20:53:27-04:00

  Documentation fixes for demand signature notation
  
  Fixes #27115.
  

• 59391132
  by Simon Jakobi at 2026-04-08T20:54:08-04:00

  Use upsert for non-deleting map updates
  
  Some compiler functions were using `alter`, despite never removing
  any entries: they only update an existing entry or insert a new one.
  
  These functions are converted to using `upsert`:
  
      alter  :: (Maybe a -> Maybe a) -> Key -> Map a -> Map a
      upsert :: (Maybe a ->       a) -> Key -> Map a -> Map a
  
  `upsert` variants are also added to APIs of the various Word64Map
  wrapper types.
  
  The precedent for this `upsert` operation is in the containers library:
  see https://github.com/haskell/containers/pull/1145
  
      Metrics: compile_time/bytes allocated
      -------------------------------------
  
          geo. mean:    -0.1%
          minimum:      -0.5%
          maximum:      +0.0%
  
  Resolves #27140.
  

• da7e82f4
  by Cheng Shao at 2026-04-08T20:54:49-04:00

  testsuite: fix testsuite run for +ipe again
  
  This patch makes the +ipe flavour transformer pass the entire
  testsuite again by dropping stdout/stderr checks of certain tests that
  are sensitive to stack layout changes with `+ipe`. Related: #26799.
  

• b135a87d
  by Zubin Duggal at 2026-04-09T19:36:50+05:30

  Bump directory submodule to 1.3.11.0 (unreleased)
  

• 3a291d07
  by Zubin Duggal at 2026-04-09T19:36:50+05:30

  Bump file-io submodule to 0.2.0
  

• e0ab606d
  by Zubin Duggal at 2026-04-10T18:40:20+05:30

  Release notes for GHC 10.0
  

• e08b9b34
  by Zubin Duggal at 2026-04-10T18:40:20+05:30

  Bump ghc-prim version to 0.14.0
  

• a92aac6e
  by Zubin Duggal at 2026-04-10T18:40:20+05:30

  Bump template-haskell to 2.25.0.0; update submodule exceptions for TH 2.25
  

• f254d9e8
  by Zubin Duggal at 2026-04-10T18:40:20+05:30

  Bump GHC version to 10.0
  

• 6ce0368a
  by Zubin Duggal at 2026-04-10T18:40:28+05:30

  Bump base to 4.23.0.0; update submodules for base 4.24 upper bound
  

• 702fb8a5
  by Zubin Duggal at 2026-04-10T18:40:28+05:30

  Bump GHC version to 10.1; update submodules template-haskell-lift and template-haskell-quasiquoter for ghc-internal 10.200
  

• 75df1ca4
  by Zubin Duggal at 2026-04-10T18:40:28+05:30

  Use changelog.d for release notes (#26002)
  
  GHC now uses a fragment-based changelog workflow using a custom script adapted from https://codeberg.org/fgaz/changelog-d.
  
  Contributors add a file in changelog.d/ for each user-facing change.
  At release time, these are assembled into release notes for sphinx (in RST) format, using
  the tool.
  
  New hadrian `changelog` target to generate changelogs
  
  CI job to validate changelog entries for MRs unless skipped with ~"no-changelog" label
  
  Teach sphinx about ghc-mr: extlink to link to MRs
  
  Remove `ghc-package-list` from sphinx, and implement it in changelog-d instead (Fixes #26476).
  
  (cherry picked from commit 989c07249978f418dfde1353abfad453f024d61a)
  

• 585d7450
  by Luite Stegeman at 2026-04-11T02:17:13-04:00

  tc: discard warnings in tcUserStmt Plan C
  
  We typecheck let_stmt twice, but we don't want the warnings twice!
  
  see #26233
  

• 2df604e9
  by Sylvain Henry at 2026-04-11T02:19:30-04:00

  Introduce TargetInt to represent target's Int (#15973)
  
  GHC was using host 'Int' in several places to represent values that
  live in the target machine's 'Int' type.  This is silently wrong when
  cross-compiling from a 32-bit host to a 64-bit target: the host Int
  is 32 bits while the target Int is 64 bits.
  
  See Note [TargetInt] in GHC.Platform.
  
  Also used the opportunity to make DynTag = Word8.
  
  Fixes #15973
  
  Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
  

• d419e972
  by Luite Stegeman at 2026-04-13T15:16:04-04:00

  Suppress desugaring warnings in the pattern match checker
  
  Avoid duplicating warnings from the actual desugaring pass.
  
  fixes #25996
  

• c5b80dd0
  by Phil de Joux at 2026-04-13T15:16:51-04:00

  Typo ~/ghc/arch-os-version/environments
  

• 71462fff
  by Luite Stegeman at 2026-04-13T15:17:38-04:00

  add changelog entry for #26233
  

• d1ddfd4b
  by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00

  Add test for #25636
  
  The existing test behaviour of "T23146_liftedeq" changed because the
  simplifier now does a bit more inlining. We can restore the previous bad
  behavior by using an OPAQUE pragma.
  
  This test doubles as a test for #25636 when run in ghci, so we add it as
  such.
  

• b9df40ee
  by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00

  refactor: protoBCOName is always a Name
  
  Simplifies the code by removing the unnecessary type argument to
  ProtoBCO which was always 'Name'
  

• 5c2a179e
  by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00

  Allocate static constructors for bytecode
  
  This commit adds support for static constructors when compiling and
  linking ByteCode objects.
  
  Top-level StgRhsCon get lowered to ProtoStaticCons rather than to
  ProtoBCOs. A ProtoStaticCon gets allocated directly as a data con
  application on the heap (using the new primop newConApp#).
  
  Previously, we would allocate a ProtoBCO which, when evaluated, would
  PACK and return the constructor.
  A few more details are given in Note [Static constructors in Bytecode].
  
  Secondly, this commit also fixes issue #25636 which was caused by
  linking *unlifted* constructors in BCO instructions as
      - (1) a thunk indexing the array of BCOs in a module
      - (2) which evaluated to a BCO which still had to be evaluated to
        return the unlifted constructor proper.
  
  The (2) issue has been resolved by allocating the static constructors
  directly. The (1) issue can be resolved by ensuring that we allocate all
  unlifted top-level constructors eagerly, and leave the knot-tying for
  the lifted BCOs and top-level constructors only.
  
  The top-level unlifted constructors are never mutually recursive, so we
  can allocate them all in one go as long as we do it in topological
  order. Lifted fields of unlifted constructors can still be filled by the
  knot-tied lifted variables since in those fields it is fine to keep
  those thunks. See Note [Tying the knot in createBCOs] for more details.
  
  Fixes #25636
  
  -------------------------
  Metric Decrease:
      LinkableUsage01
  -------------------------
  

• cde47053
  by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00

  Revert "StgToByteCode: Assert that PUSH_G'd values are lifted"
  
  This reverts commit ec26c54d818e0cd328276196930313f66b780905.
  
  Ever since f7a22c0f4e9ae0dc767115d4c53fddbd8372b777, we now do support
  and will link top-level unlifted constructors into evaluated and
  properly tagged values which we can reference with PUSH_G.
  
  This assertion is no longer true and triggered a failure in T25636
  

• c7a7e5b8
  by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00

  refactor: Tag more remote Ptrs as RemotePtr
  
  Pure refactor which improves the API of
  
  - GHC.ByteCode.Linker
  - GHC.Runtime.Interpreter
  - GHC.Runtime.Interpreter.Types.SymbolCache
  
  by using `RemotePtr` for more functions which used to return `Ptr`s that
  could potentially be in a foreign process. E.g. `lookupIE`,
  `lookupStaticPtr`, etc...
  

• fc59494c
  by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00

  Add float# and subword tests for #25636
  
  These tests cover that static constructors in bytecode work correctly
  for Float# and subword values (Word8#, Word16#)
  

• 477f521b
  by Rodrigo Mesquita at 2026-04-14T18:41:12-04:00

  test: Validate topoSort logic in createBCOs
  
  This test validates that the topological sorting and ordering of the
  unlifted constructors and lifted constructors in `createBCOs` is
  correct.
  
  See `Note [Tying the knot in createBCOs]` for why tying the knot for the
  created BCOs is slightly difficult and why the topological sorting is
  necessary.
  
  This test fails when `let topoSortedObjs = topSortObjs objs` is
  substituted by `let topoSortedObjs = zip [0..] objs`, thus witnessing
  the toposort logic is correct and necessary.
  
  The test calls the ghci `createBCOs` directly because it is currently
  impossible to construct in Source Haskell a situation where a top-level
  static unlifted constructor depends on another (we don't have top-level
  unlifted constructors except for nullary constructors like `Leaf ::
  (UTree :: UnliftedType)`).
  
  This is another test for fix for #25636
  

• 2d9c30be
  by Simon Jakobi at 2026-04-14T18:42:00-04:00

  Improve tests for `elem`
  
  ...in order to simplify the work on #27096.
  
  * Improve T17752 by including the Core output in golden files, checking
    both -O1 and -O2.
  * Add tests for fusion and no-fusion cases.
  
  Fixes #27101.
  

• 2dadf3b0
  by sheaf at 2026-04-16T13:28:39-04:00

  Simplify mkTick
  
  This commit simplifies 'GHC.Core.Utils.mkTick', removing the
  accumulating parameter 'rest' which was suspiciously treating a bunch of
  different ticks as a group, and moving the group as a whole around the
  AST, ignoring that the ticks in the group might have different placement
  properties.
  
  The most important change is that we revert the logic (added in 85b0aae2)
  that allowed ticks to be placed around coercions, which caused serious
  issues (e.g. #27121). It was just a mistake, as it doesn't make sense
  to put a tick around a coercion.
  
  Also adds Note [Pushing SCCs inwards] which clarifies the logic for
  pushing SCCs into lambdas, constructor applications, and dropping SCCs
  around non-function variables (in particular the treatment of splittable
  ticks).
  
  A few other changes are also implemented:
  
    - simplify 'can_split' predicate (no functional change)
    - combine profiling ticks into one when possible
  
  Fixes #26878, #26941 and #27121
  
  Co-authored-by: simonpj <simon.peytonjones@gmail.com>
  

• a0d6f1f4
  by Simon Jakobi at 2026-04-16T13:29:28-04:00

  Add regression test for #9074
  
  Closes #9074.
  

• d178ee89
  by Sylvain Henry at 2026-04-16T13:30:25-04:00

  Add changelog for #15973
  

• e8a196c6
  by sheaf at 2026-04-16T13:31:19-04:00

  Deal with 'noSpec' in 'coreExprToPmLit'
  
  This commit makes two separate changes relating to
  'GHC.HsToCore.Pmc.Solver.Types.coreExprAsPmLit':
  
    1. Commit 7124e4ad mistakenly marked deferred errors as non-canonical,
       which led to the introduction of 'nospec' wrappers in the
       generated Core. This reverts that accident by declaring deferred
       errors as being canonical, avoiding spurious 'nospec' wrapping.
    2. Look through magic identity-like Ids such as 'nospec', 'inline' and
       'lazy' in 'coreExprAsPmLit', just like Core Prep does.
       There might genuinely be incoherent evidence, but that shouldn't
       obstruct the pattern match checker. See test T27124a.
  
  Fixes #25926 #27124
  
  -------------------------
  Metric Decrease:
      T3294
  -------------------------
  

• 8cb99552
  by Sylvain Henry at 2026-04-16T19:22:43-04:00

  hadrian: warn when package index is missing (#16484)
  
  Since cabal-install 3.0 we can query the path of remote-repo-cache and
  check if hackage package index is present.
  
  Fixes #16484
  

• d6ce7477
  by Richard Eisenberg at 2026-04-16T19:23:25-04:00

  Teach hadrian to --skip-test.
  
  Fixes #27188.
  
  This adds the --skip-test flag to `hadrian build`, as documented in the
  patch.
  

• 7666f4a9
  by Fendor at 2026-04-17T22:29:51-04:00

  Migrate `ghc-pkg` to use `OsPath` and `file-io`
  
  `ghc-pkg` should use UNC paths as much as possible to avoid MAX_PATH
  issues on windows.
  
  `file-io` uses UNC Paths by default on windows, ensuring we use the
  correct APIs and that we finally are no longer plagued by MAX_PATH
  issues in CI and private machines.
  
  On top of it, the higher correctness of `OsPath` is appreciated in this
  small codebase. Also, we improve memory usage very slightly, due to the
  more efficient memory representation of `OsPath` over `FilePath`
  
  Adds `ghc-pkg` regression test for MAX_PATH on windows
  
  Make sure `ghc-pkg` behaves as expected when long paths (> 255) are
  involved on windows.
  
  Let's generate a testcase where we can actually observe that `ghc-pkg`
  behaves as epxected.
  
  See the documentation for windows on Maximum Path Length Limitation:
  
  * `https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation`
  
  Adds changelog entry for long path support in ghc-pkg.
  

• 78434e8c
  by Simon Peyton Jones at 2026-04-17T22:30:38-04:00

  Kill off the substitution in Lint
  
  Now that we have invariant (NoTypeShadowing) we no longer
  need Lint to carry an ambient substitution.  This makes it
  simpler and faster.  A really worthwhile refactor.
  
  There are some knock-on effects
  
  * Linting join points after worker/wrapper.  See
    Note [Join points and beta redexes]
  
  * Running a type substitution after the desugarer.
    See Note [Substituting type-lets] in
    the new module GHC.Core.SubstTypeLets
  
  Implements #27078
  
  Most perf tests don't use Lint so we won't see a perf incresae.
  But T1969, which uses -O0 and Lint, gets 1.3% worse because it has
  to run the SubstTypeLets pass which is a somewhat expensive no-op
  
  Overall though compile-time allocations are down 0.1%.
  
  Metric Increase:
      T1969
  

• 86ca6c2c
  by mangoiv at 2026-04-17T22:31:22-04:00

  testsuite: inline elemCoreTest
  
  Some weird (probably python scoping) rule caused elemCoreTest, a regex
  being out of scope on ubuntu, presumably because of a newer python version.
  This patch just inlines the regex, which fixes the issue.
  
  Fixes #27193
  

• 72d6dc74
  by aparker at 2026-04-20T20:15:44-04:00

  NCG: Implement constant folding for vector simd ops (Issue #25030)
  

• b9cab907
  by sheaf at 2026-04-20T20:15:44-04:00

  Mark some SIMD tests as broken on i386 optllvm
  
  As seen in #25498, several SIMD tests are broken on i386 in the optllvm
  way. This commit marks them as "expect_broken".
  

• 76528cc3
  by Wolfgang Jeltsch at 2026-04-20T20:16:25-04:00

  Move most of the `System.IO` implementation into `base`
  
  This involves a rewrite of the `combine` helper function to avoid the
  use of `last`, which would now be flagged as an error.
  
  Metric Decrease:
      LinkableUsage01
      T3294
  Metric Increase:
      T12227
      T12707
      T5642
  

• 04d143c0
  by Luite Stegeman at 2026-04-21T14:05:33-04:00

  rts: add a few missing i386 relocations in the rts linker
  

• 014087e7
  by Luite Stegeman at 2026-04-21T14:05:34-04:00

  CodeOutput: Fix finalizers on multiple platforms
  
   - ELF platforms: emit .fini_array section
   - wasm32/Darwin: emit initializer with __cxa_atexit call
   - Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols
   - rts linker: fix crash/assertion failure unloading objects with finalizers
  
  fixes #27072
  

• 915bba6f
  by Simon Jakobi at 2026-04-21T14:06:16-04:00

  Add regression test for #10531
  
  Closes #10531.
  

• 86a646a6
  by Andreas Klebinger at 2026-04-22T13:00:05-04:00

  Revert use of generic instances for compiler time perf reasons.
  
  Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871"
  
  This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9.
  
  Revert "add Ghc.Data.Pair deriving"
  
  This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce.
  

• bc9ee1cf
  by Wen Kokke at 2026-04-22T13:00:51-04:00

  hadrian: Fix docs to remove static flavour
  
  In 638f6548, the static flavour was turned into into the fully_static
  flavour transformer. However, this commit did not update flavours.md.
  

• cc9cc6d5
  by Cheng Shao at 2026-04-23T09:40:46+00:00

  configure: bump LlvmMaxVersion to 23
  
  This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases.
  

• 2ea7ef8e
  by Cheng Shao at 2026-04-23T09:46:26+00:00

  changelog: add llvm 22.x support
  

• 5574ee10
  by Cheng Shao at 2026-04-24T08:24:30-04:00

  compiler: avoid unused temporary `appendFS` operands
  
  This patch fixes unused temporary `appendFS` operands in the codebase
  that are retained in the `FastString` table after concatenation.
  Rewrite rules are added so that if an operand is
  `fsLit`/`mkFastString`, the `appendFS` application is rewritten to
  append the `ShortByteString` operands first. The patch also fixes
  `sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205.
  

• 4ed78760
  by mangoiv at 2026-04-24T08:25:13-04:00

  contributing: adjust MR template to be less verbose
  
  - MR template only shows text that is relevant for submissiong
  - MR template was rewritten so it's readable from a user's and reviewer's
    perspective
  
  Resolves #27165
  
  Co-Authored-By: @sheaf
  

• 87db83e2
  by Cheng Shao at 2026-04-24T14:37:21-04:00

  ci: bump freebsd boot ghc to 9.10.3
  
  This commit bumps freebsd boot ghc to 9.10.3 to align with other
  platforms and prevent outdated boot libs in boot ghc to block the
  freebsd job.
  

• 17e3a0b7
  by Cheng Shao at 2026-04-24T14:37:21-04:00

  compiler: improve Binary instance of Array
  
  This patch improves the `Binary` instance of `Array`:
  
  - We no longer allocate intermediate lists. When serializing an
    `Array`, we iterate over the elements directly; when deserializing
    it, we allocate the result `Array` and fill it in a loop.
  - Now we only serialize the array bounds tuple; the length field is
    not needed.
  
  Closes #27109.
  

• 2d30f7d3
  by sheaf at 2026-04-24T14:38:23-04:00

  Vendor mini-QuickCheck for testsuite
  
  This commit extracts the vendored QuickCheck implementation from the
  foundation testsuite to make it more broadly available in the GHC
  testsuite, and makes use of it in the simd006 test (which also used
  a vendored QuickCheck implementation).
  
  On the way, we update the linear congruential generator to avoid the
  shortcoming of only generating 31 bit large numbers.
  
  Fixes #25990 and #25969.
  

• 1350271b
  by sheaf at 2026-04-27T09:32:53-04:00

  Ensure TcM plugins are only initialised once
  
  This commit ensures we keep TcM plugins (typechecker plugins,
  defaulting plugins and hole fit plugins) running all the way through
  desugaring, instead of stopping them at the end of typechecking.
  
  To do this, the "stop" actions of TcPlugin and DefaultingPlugin are
  split into two: one for the "post-typecheck" action, and one for the
  final shutdown action (after desugaring).
  
  This allows the plugins to be invoked by the pattern match checker
  (during desugaring) without having to be repeatedly re-initialised and
  stopped, fixing #26839.
  
  In the process, this commit modifies 'initTc' and 'initTcInteractive',
  adding an extra argument that describes whether to start/stop the 'TcM'
  plugins.
  
  See Note [Stop TcM plugins after desugaring] for an overview.
  

• 42549222
  by sheaf at 2026-04-27T09:33:50-04:00

  Hadrian: add --keep-response-files
  
  This commit adds a Hadrian flag that allows response files to be
  retained. This is useful for debugging a failing Hadrian command line.
  

• 40564e8d
  by sheaf at 2026-04-27T09:34:46-04:00

  hadrian/build-cabal.bat: fix build on Windows
  
  Commit 8cb99552f6 introduced a warning for a missing package index.
  However, the logic was faulty on Windows: the piping was broken, and
  "remote-repo-cache:" was being interpreted as a (malformed) drive letter,
  leading to the error:
  
    The filename, directory name, or volume label syntax is incorrect.
  
  This commit fixes that by using a temporary file instead of piping.
  

• 14bc71e4
  by Sven Tennie at 2026-04-28T13:22:47-04:00

  ghc: Distinguish between having an interpreter and having an internal one
  
  Actually, these are related but different things:
  
  - ghc can run an interpreter (either internal or external)
  - ghc is compiled with an internal interpreter
  
  Splitting the logic solves compiler warnings and expresses the intent
  better.
  

• df691563
  by Vladislav Zavialov at 2026-04-28T13:23:29-04:00

  Refactor HsWildCardTy to use HoleKind (#27111)
  
  The payload of this patch is that the extension fields of HsWildCardTy
  and HsHole now match:
  
  	type instance XWildCardTy Ghc{Ps,Rn} = HoleKind
  	type instance XHole       Ghc{Ps,Rn} = HoleKind
  
  This is progress towards unification of HsExpr and HsType.
  Test case: T25121_status
  
  In addition to that, exact-printing of infix holes is fixed.
  Test case: PprInfixHole
  

• f3485446
  by fendor at 2026-04-28T13:24:12-04:00

  Expose startupHpc as an rts symbol
  

• 28f07d70
  by fendor at 2026-04-28T13:24:12-04:00

  Make HPC work with bytecode interpreter
  
  Add support to generate .tix files from bytecode objects and the
  bytecode interpreter.
  
  Conceptually, we insert HPC ticks into the bytecode similar to how we insert
  breakpoints.
  HPC and breakpoints do not share the same tick array but we use a separate
  tick-array for hpc/breakpoint ticks during bytecode generation.
  
  We teach the bytecode interpreter to handle hpc ticks.
  The implementation is quite trivial, simply increment the counter in the
  global hpc_ticks array for the respective module.
  
  This hpc_ticks array is generated as part of the `CStub`, so we can rely
  on it existing.
  
  A tricky bit is "registering" a bytecode object for HPC instrumentation.
  In the compiled case, this is achieved via CStub and initializer/finalizers
  `.init` sections which are called when the executable is run.
  After the initializers have been invoked, which is before `hs_init_ghc`,
  we then call `startup_hpc` in `hs_init_ghc` iff any modules were "registered"
  for hpc instrumentation via `hs_hpc_module`.
  
  Since bytecode objects are loaded after starting up GHCi, this workflow
  doesn't work for supporting `hpc` and the `hpc` run-time is never
  started, even if a module is added for instrumentation.
  
  We fix this issue by employing the same technique as is for `SptEntry`s:
  
  * We introduce a new field to `CompiledByteCode`, called `ByteCodeHpcInfo`
    which contains enough information to call `hs_hpc_module`, allowing us to
    register the module for `hpc` instrumentation`.
  * After registering the module, we unconditionally call `startupHpc`, to make
    sure the .tix file is written.
  
  Calling `startupHpc` multiple times is safe.
  Calling `hs_hpc_module` multiple times for the same module is also safe.
  
  If we didn't register the hpc module in this way, evaluating a bytecode object
  instrumented with `-fhpc` without registering it in the `hpc` run-time will
  simply not generate any `.tix` files for this bytecode object.
  
  However, this shouldn't happen if everything is set up correctly.
  
  Closes #27036
  

• 950879f0
  by Vladislav Zavialov at 2026-04-28T13:24:55-04:00

  Move NamespaceSpecifier from x-fields into the AST proper (#26678)
  
  This refactoring moves NamespaceSpecifier out of extension fields and into the
  AST proper, as it is part of the user-written source, and is not pass-specific.
  
  Summary of changes:
  
  * Move NamespaceSpecifier from GHC/Hs/Basic.hs to Language/Haskell/Syntax/ImpExp.hs
    and parameterise it by the compiler pass, creating the necessary extension points
  * Move NamespaceSpecifier out of XFixitySig into FixitySig
  * Move NamespaceSpecifier out of XIEThingAll (IEThingAllExt) into IEThingAll
  * Move NamespaceSpecifier out of XIEWholeNamespace (IEWholeNamespaceExt) into IEWholeNamespace
  
  This is a pure refactoring with no change in behaviour.
  

• 9797052b
  by Simon Peyton Jones at 2026-04-28T13:25:37-04:00

  Fix assertion check in checkResultTy
  
  As #27210 shows, the assertion was a little bit too eager.
  
  I refactored a bit by moving some code from GHC.Tc.Gen.App
  to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp,
  which replaces tcSubTypeDS
  

• 9f85f034
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Make cmm 'import "package" name;' syntax use consistent label types
  
  There is a little-used syntactic form in cmm imports:
  
  import "package" foo;
  
  Which means to import foo from the given package (unit id, specified as
  a string). This syntax is somewhat reminiscent of GHC's package import
  extension.
  
  This syntax form is not used in the rts cmm code, nor any of the boot
  libraries. It may not be used at all. Unclear.
  
  Change the kind of CLabel this syntax generates to be consistent with
  the others. The other cmm imports use ForeignLabel with
  ForeignLabelInExternalPackage. For some reason this form was using
  CmmLabel. Change that to also be ForeignLabel but with
  ForeignLabelInPackage. This specifies a specific package, rather
  than an unnamed external package.
  

• a811f68f
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Change default cmm import statements to be internal
  
  Previously a cmm statement like:
  
  import foo;
  
  meant to expect the symbol from a different shared library than the
  current one.
  
  Now it means to expect the symbol from the same shared library as the
  current one. We'll add explicit syntax to indicate that it's a foreign
  import. Most existing uses are in fact intenal (rts to rts), so few
  imports will need to be annotated foreign. Examples would include cmm
  code in libraries (other than the rts) that need to access RTS APIs.
  
  In practice, this makes no difference whatsoever at the moment on any
  platform other than windows (where building Haskell libs as shared libs
  does not fully work yet), since the 'labelDynamic' treats all such
  labels as foreign, irrespective of the foreign label source.
  

• 17fe5d1d
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add cmm import syntax 'import DATA foo;' as better name for CLOSURE
  
  The existing syntax is:
  
  import CLOSURE foo;
  
  The new syntax is
  
  import DATA foo;
  
  This means to interpret the symbol foo as refering to data (i.e. a
  global constant or variable) rather than to code (a function). The
  historical syntax for this uses CLOSURE, which is rather misleading.
  Presumably this was done to avoid introducing new reserved words.
  
  Be less squemish about new reserved words and add DATA and use that.
  Keep the existing CLOSURE syntax as an alias for compatibility.
  

• 3a530d68
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add cmm 'import extern name;' syntax
  
  Since the default for cmm imports is now for symbols within the same
  shared object, we need a way to indicate we want a symbol from an
  external shared object:
  
  import extern foo;      -- for a function
  import extern DATA foo; -- for data
  
  This adds a new reserved word 'extern'.
  
  We don't expect to have to use this much. Most cmm imports are
  intra-DSO.
  
  This makes no difference currently on ELF and MachO platforms, but does
  make a difference to the linking conventions on PE (Windows).
  
  In future it's plausible we could take make distinctions on ELF or
  MachO, so it's worth trying to get it right. Windows can be the guinea
  pig.
  

• 2b8e44c7
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add cmm syntax 'import "package" DATA foo;' for completeness
  
  We already have:
  
  import DATA foo;      -- for data imports
  import "package" foo; -- for imports from a given unitid
  
  There's no reason not to have both at once:
  
  import "package" DATA foo;
  
  So add that.
  

• ee05e5cc
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Improve the commentary for the cmm import grammar.
  
  AFAIK, this is the only place where GHC-style Cmm syntax is documented.
  

• b35946ad
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add a changelog.d entry for the .cmm import syntax changes
  

• d59b7c71
  by Wolfgang Jeltsch at 2026-04-30T04:53:25-04:00

  Move code that uses `GHC.Internal.Text.Read` into `base`
  
  This contribution serves to remove all dependencies on
  `GHC.Internal.Text.Read` from within `ghc-internal`, so that the
  implementation of `Text.Read` and ultimately more reading-related code
  can be moved to `base` as well.
  
  The following things are moved from `ghc-internal` to `base`:
  
    * I/O-related `Read` instances
    * Most of the `Numeric` implementation
    * The instance `Read ByteOrder`
    * The `parseVersion` operation
    * The `readConstr` operation
  
  Metric Increase:
      LinkableUsage01
      T9198
      T12425
      T13035
      T13820
      T18140
  

• 5bd6a964
  by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00

  New rts Message to {set,unset} TSO flags
  
  This commit introduces stg_MSG_SET_TSO_FLAG_info and
  stg_MSG_UNSET_TSO_FLAG_info, which allows setting flags of a TSO other
  than yourself.
  
  This is especially useful/necessary to set breakpoints and toggle
  breakpoints of different threads, which is needed to safely implement
  features like pausing, toggling step-out, toggling step-in per thread,
  etc.
  
  Fixes #27131
  
  -------------------------
  Metric Decrease:
      T3294
  -------------------------
  

• ce97fd3e
  by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00

  test: Add test setting another TSO's flags
  
  Introduces a test that runs on two capabilities. The main thread running
  on Capability 0 sets the flags on a TSO running on Capability 1.
  The TSO from Capability 1 itself checks whether its flags were set and
  reports that back.
  
  This validates that the RTS messages for setting TSO flags work, even if
  it doesn't test a harsher scenario with race conditions to exercise why
  the message passing is necessary for safely setting another TSO's flags.
  
  Part of #27131
  

• a4ff6315
  by David Eichmann at 2026-04-30T04:54:51-04:00

  Hadrian: withResponseFile outputs response file when verbodity is Verbose
  
  At the Verbose verbosity, shake will display full commandlines. With the
  use of response files, the full command is hidden. That makes it hard to run
  the command manually. This commit outputs the contents of the response
  file so that that full command can be recreated and also hints at the
  use of the --keep-response-files hadrian flag.
  

• cd732ee3
  by Duncan Coutts at 2026-04-30T04:54:51-04:00

  Use response files for hadrian linking with ghc (support long command lines)
  
  In future support for windows dynamic linking, we expect long command
  lines for linking dll files with ghc. Experiments with dynamic linking the
  ghc-internal library yielded a link command well over 32kb. We did not
  encounter this before for static libs, since we already use ar's @file
  feature (if available, which it is for the llvm toolchain).
  
  Co-authored-by: David Eichmann <davide@well-typed.com>
  

• 3d41368f
  by Andreas Klebinger at 2026-04-30T04:55:32-04:00

  Split GHC.Driver.Main.hs up into multiple components.
  
  This commit splits GHC.Driver.Main into four components:
  
  * GHC.Driver.Main.Compile
  * GHC.Driver.Main.Hsc
  * GHC.Driver.Main.Interactive
  * GHC.Driver.Main.Passes
  
  We might improve that separation further in the future but this should
  hopefully make it easier to reason about and work with this part of the
  code.
  

• 2128ba85
  by Cheng Shao at 2026-04-30T04:56:14-04:00

  compiler: avoid unique OccNames for internal Names in bytecode objects
  
  This patch improves bytecode object serialization logic by avoiding
  the construction of unique `OccName`s when serializing/deserializing
  internal `Name`s. Closes #27213.
  
  -------------------------
  Metric Decrease:
      LinkableUsage01
  -------------------------
  

• e16854c3
  by Vladislav Zavialov at 2026-04-30T04:56:57-04:00

  Replace GHC 9.16 references with GHC 10.0
  

• 39141343
  by Alice Rixte at 2026-05-01T14:09:32+02:00

  Add Bounded instances for Double, Float, CDouble and CFloat
  

• 5c4c3bf4
  by Sylvain Henry at 2026-05-02T03:39:28-04:00

  testsuite: fix flaky foundation Divisible / mulIntMayOflo# tests (#27222)
  
  Since the LCG was widened to 64 bits and the seed randomised per CI run
  (commit 2d30f7d3400 "Vendor mini-QuickCheck for testsuite"), two latent
  bugs in the foundation test surface stochastically:
  
  * The Divisible property `(x `div` y) * y + (x `mod` y) == x` raises
    ArithException(Overflow) when (a, b) = (minBound, -1) for fixed-width
    signed Integral types. Split testNumber/testDivisible into Bounded and
    unbounded variants and skip just that one pair, gated by
    `(minBound :: a) < 0` so unsigned types lose no coverage.
  
  * The `mulIntMayOflo#` test compared raw Int# bit-for-bit, but the primop
    is only specified to return 0/non-zero -- the exact non-zero indicator
    legitimately differs between backends and inlining choices. Add a
    dedicated `testPrimopMayOflo` helper that only compares zero / non-zero.
  
  Also fix the long-standing typo "Dividible" -> "Divisible" in identifiers.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• e242ce4f
  by Sylvain Henry at 2026-05-02T03:39:28-04:00

  testsuite: catch and display exceptions in MiniQuickCheck
  
  Exceptions raised while evaluating a property are now caught and reported
  as a normal failure (with arguments and seed), instead of aborting the
  test.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 3b75cccd
  by fendor at 2026-05-02T03:40:14-04:00

  Fix name of Note [Structure of dep_boot_mods]
  

• 9a9ae4df
  by Duncan Coutts at 2026-05-05T14:44:37-04:00

  Use __attribute__((dllimport)) for external RTS symbol declarations
  
  This is needed to be hygenic about DLL symbol imports and exports.
  The attribute is ignored on platforms other than Windows.
  
  Use of the attribute however means that external data symbols do not
  have a compile-time constant address (they are loaded using an
  indirection). This means we have to adjust the rtsSyms initial linker
  table so that it is a local constant in a function, rather than a global
  constant. We now define it within a function that pre-populates the
  symbol table with the RTS symbols.
  

• 2ad3e01e
  by Duncan Coutts at 2026-05-05T14:44:37-04:00

  Fix the rts linker declarations for a few data symbols
  
  and ensure that the (windows only) rts_IOManagerIsWin32Native data
  symbol is marked as externally visible.
  

• 8ff4fdb5
  by David Eichmann at 2026-05-05T14:44:37-04:00

  Hadrian: Disable runtime pseudo relocations for RTS on windows hosts
  

• 96974723
  by Teo Camarasu at 2026-05-05T14:45:20-04:00

  ghci/TH: refactor to use IORef QState
  
  This is a pure refactor and shouldn't modify semantics at all
  

• eff6bfaf
  by Teo Camarasu at 2026-05-05T14:45:20-04:00

  iserv: recover/getQ/putQ should behave same as internal interpreter
  
  The internal and external interpreter should behave the same when
  handling `recover`, the exeception recovery method of Q.
  In practice, they diverge. In case of failure, the internal interpreter
  only restores error message state to before the computation, wheras the
  external interperter restores error message state *and* the state of putQ/getQ.
  
  As far as I can tell this is a simple mistake in the implementation.
  Note [TH recover with -fexternal-interpreter] describes the correct
  behaviour but the implementation doesn't mirror this.
  
  This change restores the correct behaviour by keeping the effects of
  putQ in the erroring computation.
  
  This is a breaking change since it modifies the behaviour of programs
  that rely on recover ignoring putQ from failling computations when used
  with the external interpreter. Although I highly doubt anyone relies on
  this behaviour.
  
  This divergence was first introduced in d00c308633fe7d216d31a1087e00e63532d87d6d.
  As far as I can tell this was unintentional and tha commit was trying to solve a different bug.
  
  Resolves #27022
  

• 1cb1d672
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Add dynamic trace flags API
  
  This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags.
  Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer).
  This extends that functionality to also cover the core event types.
  
  The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags.
  This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation.
  Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes.
  
  The trace flags are not protected by locks of any sort.
  Hence, these functions are not thread-safe.
  However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign.
  
  This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match.
  Prior to the change to uint8_t, they had type int, see 42c47cd6.
  Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h.
  The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only.
  

• 9d54dc94
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X
  

• 418d737b
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Fix nonmoving-GC tracing
  
  The current nonmoving-GC tracing functions were written in a different
  style from the other tracing functions. They were directly implemented
  as, e.g., a traceConcMarkEnd function that called postConcMarkEnd.
  The other tracing functions are implemented as, e.g., traceThreadLabel_,
  a function that posts the thread label event, and traceThreadLabel, a
  macro that checks whether TRACE_scheduler is set. This commit fixes that
  implementation, and ensures that the nonmoving-GC tracing functions only
  emit events if nonmoving-GC tracing is enabled.
  

• 99f4afa4
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Add SymI_HasProto for get/setTraceFlag
  

• 7e9eb8b9
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Add SymI_HasProto for start/endEventLogging
  

• 3a3045fb
  by Wen Kokke at 2026-05-06T09:53:41-04:00

  rts: Add changelog entry
  

• a3b339a4
  by Teo Camarasu at 2026-05-06T09:54:25-04:00

  interface-stability/base: don't distinguish ws-32
  
  The interface of base is identical when the Word size is 32bits.
  Therefore, there is no need to have another file for this case.
  So, we delete it.
  
  Step towards: #26752
  

• eb922183
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Add a rts posix FdWakup utility module
  
  This will be used to implement wakeupIOManager for in-RTS I/O managers.
  
  It provides a notification/wakeup mechanism using FDs, suitable for
  situations when a thread is blocked on a set of fds anyway. It uses the
  classic self-pipe trick, or equivalently eventfd on supported platforms.
  
  This will initially be used to implement prompt interrupt or shutdown of
  the posix ticker thread.
  

• 01b0e233
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Add prompt shutdown to the pthread ticker implementation.
  
  The Linux timerfd ticker monitors a pipe which is used by exitTicker to
  ensure a prompt wakeup and shutdown. The pthread ticker lacked this and
  so would only exit at the next ticker wakeup (10ms by default).
  
  This patch adds the same mechanism to the pthread ticker.
  
  This changes the pthread ticker from waiting by using nanosleep() to
  waiting using either ppoll() or select(), so that it can wait on both
  a time and a file descriptor. On Linux at least, a test program to
  compare the timing jitter of these APIs shows that using nanpsleep,
  ppoll or select makes no statistical difference to the maximum or
  average jitter.
  
  This is a step towards unifying the posix ticker implementations, so
  that we can have just one portable one (albeit with some limited cpp).
  It is also a step towards using the ticker as part of a more general
  implementation of wakeUpRts, since this will require a method to wake
  the rts from a signal handler context (ctl-c handler).
  

• bc41d646
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Update ticker header commentary
  
  It was antique and didn't apply even to the previous implementation, and
  certainly not to the updated one.
  

• 4ed9a386
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Remove the timerfd-based ticker implementation
  
  There does not appear to be any remaining advantage on Linux to using
  the timerfd ticker implementation over the portable one (using ppoll on
  Linux for precise timing).
  
  The eventfd implementation was originally added at a time when Linux was
  still using a signal based implementation. So it made sense at the time.
  See (closed) issue #10840.
  

• 97504fa6
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Consolidate to a single posix ticker implementation
  
  Previously we had four implementations, two using signals and two using
  threads. Having just one should make behaviour more consistent between
  platforms, and should make maintenance easier.
  

• 1e60023b
  by Facundo Domínguez at 2026-05-07T18:01:16-04:00

  Generalize so_inline to specify which bindings should be preserved
  
  This commit generalizes the so_inline option of the simple optimizer
  so we can indicate with a predicate the specific bindings that should
  be kept.
  
  This feature is important for the LiquidHaskell plugin, which relies on the
  simple optimizer to make core programs easier to read, but needs to preserve
  bindings that are relevant for verification.
  
  See https://gitlab.haskell.org/ghc/ghc/-/issues/24386 for the full discussion.
  

• 44cf9cd7
  by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00

  Move the `Text.Read` implementation into `base`
  

• 4ac3f7d6
  by Vladislav Zavialov at 2026-05-12T09:49:03-04:00

  EPA: Use AnnParen for tuples and sums
  
  Summary of changes
  
  * Do not use AnnParen in XListTy, replace it with EpToken "[" and "]"
  * Specialise AnnParen to tuple/sums by dropping the AnnParensSquare
    and keeping only AnnParens and AnnParensHash
  * Use AnnParen in XExplicitTuple
  * Use AnnParen in XExplicitTupleTy
  * Use AnnParen in XTuplePat
  * Use AnnParen in XExplicitSum (via AnnExplicitSum)
  * Use AnnParen in XSumPat (via EpAnnSumPat)
  
  This is a refactoring with no user-facing changes.
  

• 1bdcddec
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add minimal dlltool support to ghc-toolchain
  
  The dlltool is a tool that can create dll import libraries from .def
  files. These .def files list the exported symbols of dlls. Its somewhat
  like gnu linker scripts, but more limited.
  
  We will need dlltool to build the rts and ghc-internal libraries as DLLs
  on Windows. The rts and ghc-internal libraries have a recursive
  dependency on each other. Import libraries can be used to resolve
  recursive dependencies between dlls. We will use an import library for
  the rts when linking the ghc-internal library.
  

• f7fc3770
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add minimal dlltool support into ./configure
  
  Find dlltool, and hopefully support finding it within the bundled llvm
  toolchain on windows.
  

• e4e22bfb
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Update the default host and target files for dlltool support
  

• 5666c8f9
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add dlltool as a hadrian builder
  
  Optional except on windows.
  

• 5e14fe3f
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Update and generate libHSghc-internal.def from .def.in file
  
  The only symbol that the rts imports from the ghc-internal package now
  is init_ghc_hs_iface. So the rts only needs an import lib that defines
  that one symbol.
  
  Also, remove the libHSghc-prim.def because it is redundant. The rts no
  longer imports anything from ghc-prim.
  
  Keep libHSffi.def for now. We may yet need it once it is clear how
  libffi is going to be built/used for ghc.
  

• 3d91e4a6
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add rule to build libHSghc-internal.dll.a and link into the rts
  
  On windows only, with dynamic linking.
  
  This is needed because on windows, all symbols in dlls must be resolved.
  No dangling symbols allowed. References to external symbols must be
  explicit. We resolve this with an import library. We create an import
  library for ghc-internal, a .dll.a file. This is a static archive
  containing .o files that define the symbols we need, and crucially have
  ".idata" sections that specifies the symbols the dll imports and from
  where.
  
  Note that we do not install this libHSghc-internal.dll.a, and it does
  not need to list all the symbols exported by that package. We create a
  special purpose import lib and only use it when linking the rts dll, so
  it only has to list the symbols that the rts uses from ghc-internal
  (which is exactly one symbol: init_ghc_hs_iface).
  

• c8dae539
  by Alice Rixte at 2026-05-12T09:50:52-04:00

  Script for downloading and copying `base-exports` file
  

• 5fab2238
  by Wolfgang Jeltsch at 2026-05-12T21:24:27+03:00

  Introduce a cache of home module name providers
  
  This contribution introduces to the module graph a cache that maps home
  module names to sets of units providing them and changes the finder to
  use that cache. This is a performance optimization, especially for
  multi-home-unit builds.
  
  The particular changes are as follows:
  
    * In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new
      field `mg_home_module_name_providers_map`, exposed as
      `mgHomeModuleNameProvidersMap`. This is a cache that assigns to each
      home module name the set of IDs of home units that define it.
      Operations that construct module graphs are updated such that this
      cache stays synchronized.
  
    * In `GHC.Unit.Finder`, `findImportedModule` is changed to pull
      `mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to
      `findImportedModuleNoHsc`, which now does not search home units in
      arbitrary order but prioritizes those units that the cache mentions
      as potential providers of the requested module.
  
  In addition, this contribution adds variants of the two multi-component
  compiler performance tests that use 100 units instead of 20, because
  with just 20 units the benefits from caching of home module name
  providers are still negligible.
  
  The following table shows the total time needed for running both
  multi-component tests before and after this contribution and with
  different numbers of units:
  
  | # of units | Before | After |
  |-----------:|-------:|------:|
  |         20 |   0:12 |  0:12 |
  |        100 |   0:47 |  0:42 |
  |        200 |   3:05 |  2:08 |
  
  Note that there seems to be a general overhead of 12 seconds that is not
  attributable to the actual tests, so that the real running times should
  be 12 seconds smaller than shown above.
  
  Resolves #27055.
  
  Metric Decrease:
      MultiComponentModules
      MultiComponentModulesRecomp
  
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  Co-authored-by: Fendor <fendor@posteo.de>
  

• 38b76b2f
  by Cheng Shao at 2026-05-13T17:48:48-04:00

  testsuite: mark T22159 as fragile
  
  This patch marks T22159 as fragile on Windows for issue described in #27248.
  Before we get to the bottom of those failures, this unblocks newer
  Windows runners.
  

• 50188615
  by Ian Duncan at 2026-05-14T13:45:07+02:00

  AArch64: use ASR not LSR for MO_U_Shr at W8/W16
  
  The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16)
  with a variable shift amount was emitting ASR (arithmetic/signed shift
  right) after zero-extending with UXTB/UXTH. This should be LSR
  (logical/unsigned shift right). After zero-extension the upper bits
  happen to be 0 so ASR produces the same result, but it is semantically
  wrong and would break if the zero-extension were ever optimized away.
  Includes assembly output test (grep for lsr) and runtime test
  verifying unsigned right shift of Word8 and Word16 values.
  

• 28666fbf
  by Vladislav Zavialov at 2026-05-19T12:44:05-04:00

  Add type families: Tuple, Constraints, Tuple#, Sum# (#27179)
  
  These type families map tuples of types to the corresponding Tuple<N>,
  Tuple<N>#, CTuple<N>, and Sum<N># types. Some examples at N=2:
  
  	Tuple (Int, Bool)          = Tuple2 Int Bool
  	Constraints (Show a, Eq a) = CTuple2 (Show a) (Eq a)
  	Tuple# (Int#, Float#)      = Tuple2# Int# Float#
  	Sum# (Int#, Float#)        = Sum2# Int# Float#
  
  See GHC Proposal #145 "Non-punning list and tuple syntax".
  
  To make the Sum# instance at N=64 possible, this patch also introduces
  the Sum64# constructor declaration and bumps mAX_SUM_SIZE from 63 to 64.
  
  Metric Increase:
      ghc_experimental_dir
  

• 41c2448b
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  rts: Add IPE event class for -l
  
  This commit adds a new IPE event class to the -l RTS flag.
  Previously, IPE events were enabled unconditionally.
  However, the IPE events can easily grow to hundreds or thousands of megabytes.
  With the new event class you can pass, e.g., -l-I to disable IPE events.
  

• 62536551
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  ghc-internal: Add TraceFlags.traceIPE
  

• e45312d1
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  testsuite: Add test for TraceFlags.traceIpe
  

• 4768d9aa
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  ghc-internal: Add DebugFlags.ipe
  

• bc1b5c69
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  testsuite: Add test for DebugFlags.ipe
  

• 0da1543f
  by Duncan Coutts at 2026-05-19T12:45:37-04:00

  Document removal of the signal-based interval timer
  
  Update mentions within the RTS section of the users guide.
  
  Add a changelog entry.
  

• b2911514
  by Duncan Coutts at 2026-05-19T12:45:37-04:00

  Fix section for an recent changelog entry
  

• d6d76a7a
  by David Eichmann at 2026-05-19T12:46:19-04:00

  ghc-toolchain: implement llvm program versioning logic
  

• 2dd36fa3
  by Wolfgang Jeltsch at 2026-05-20T04:49:52-04:00

  Turn `Trustworthy` into `Safe` in `base` where possible
  

• f4399dd1
  by Wolfgang Jeltsch at 2026-05-20T04:50:37-04:00

  Make the current `base` buildable with GHC 10.0
  

• 1a7de232
  by Duncan Coutts at 2026-05-20T12:26:25-04:00

  Hadrian: remove legacy rts .so symlinks
  
  For compatibility with the old makefile based build system, hadrian had
  rules to generate symlinks from unversioned to versioned names for the
  rts .so/.dynlib file, like libHSrts-ghcx.y.so -> libHSrts-1.0.3-ghcx.y.so
  
  We no longer need these symlinks since the makefile build system has
  been retired some time ago. The need for these symlinks is awkward on
  windows where we cannot (in practice) create symlinks. So rather than
  make them conditional (non-windows), just remove them entirely.
  

• 286f1adf
  by fendor at 2026-05-20T12:27:09-04:00

  Fix regression T27202: `:load` and `:add` work in GHCi
  
  To fix the regression there are conceptually two major things that we
  fix:
  
  * We don't remove the `importDirs` from `interactive-session`
  * When `:add`ing a module, we don't try to find them via PackageImports
      * The PackageImport is wrong as we can't know the package-name at
        this stage in ghc/UI.hs
  
  What does it mean to not remove the `importDirs` from
  `interactive-session`?
  It means that, given some initial `DynFlags`, we will use those
  `importDirs` in `interactive-session`.
  
  The initial `DynFlags`, however, depend on how you initialise the GHC
  session.
  For a simple session, initialised by
  
      ghc -isrc -this-unit-id main
  
  It is simple, just use the `DynFlags` given on the cli.
  Thus, `main` and `interactive-session` will have the same `DynFlags`,
  except for the `homeUnitId` and `interactive-session` depends on `main`
  by construction of the GHCi session.
  
  What about a multiple home unit session, though?
  
      ghc -unit @unit1 -unit @unit2
  
  What are the `DynFlags` in this cli invocation? It shouldn't be either
  `@unti1` nor `@unit2`, as the order shouldn't matter or any other
  implicit condition.
  
  For consistency, we decide that the initial `DynFlags` are the top
  `DynFlags` on the cli, ignoring `-unit` flags.
  Thus, in this example, there are no `importsDirs` regardless of what we
  might find in `@unit1` and `@unit2`.
  
  But in this invocation:
  
      ghc -isrc -unit @unit1 -unit @unit2
  
  The `interactive-session` will have the `importsDirs` `src`.
  Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to
  explicitly use `-i` to clear the `importsDirs`, in order to avoid
  accidentally adding `src` as an import directory to all other home
  units.
  
  This fix has been made possible by the improvements introduced in
  !15888, which avoids ambiguity when a home unit shares the `importsDirs`
  with the `interactive-session`, on top of being much faster for multiple
  home units.
  
  Adds regression tests for T27202 for `:load`ing and `:add`ing modules
  that are located in import directories.
  

• 728662de
  by fendor at 2026-05-20T12:27:09-04:00

  Use home unit package db stacks in GHCi prompt and session unit
  
  In order to import modules from home unit dependencies (e.g., `Data.Map`),
  the ghci prompt unit needs to populate its `UnitState`.
  This is tricky to handle correctly, which `PackageDBFlag`s should we use
  to populate the `UnitState`?
  We decide, the most intuitive solution for users is to depend on all
  `PackageDBFlag`s, so that any dependency can be imported in GHCi.
  This assumes consistency in the `PackageDBFlag`s, so no two home units
  specify `PackageDBFlag`s that are inconsistent with each other.
  
  We could simply concat all the `PackageDBFlag`s of the existing home
  units, but later `PackageDBFlag`s shadow earlier ones, leading to the
  last processed home units' `PackageDBFlag`s to shadow the earlier ones.
  This is hard to fix, we need to give users the capability to provide ghc
  options for the ghci prompt home unit.
  However, as this is considerably more work, we decided on an
  approximation that should work out most of the time.
  
  Package Db stacks in cabal and stack follow a certain structure:
  
      -no-user-package-db > -package-db $cabal-store > -package-db $local-db
  
  The first two arguments are always the same, namely the
  `-no-user-package-db` and `-package-db`.
  We compute the longest common prefix over all home units, and use that
  as the start of the package db stack. Then, over the rest of the
  `PackageDBFlag`s, we simply take the union and append them to our
  initial stack.
  We assume, that the rest of package dbs only defines very few, "local"
  units that are usually not shadowing each other.
  
  This allows us to get a relatively consistent package database stack for
  the ghci prompt home unit.
  
  Similar reasoning applies to the session unit in order to add modules to
  the session and have dependencies available in the module.
  
  We do something similar for `-package` flags, to make sure only the
  correct units are actually visible in the ghci session.
  This time, we simply take the union of all `PackageFlag`s, allowing us
  to import modules from the home unit dependencies.
  
  In the future, it would be beneficial to allow the user to provide the
  exact ghc options to control the visibilities. For now, this will have
  to do.
  

• 740d89a0
  by Simon Peyton Jones at 2026-05-20T17:20:44-04:00

  Do not use mkCast during typechecking
  
  This commit fixes #27219.  The problem was that the typechecker was using
  `mkCast`, whose assertion checks legitimately fail when applied to types
  that contain unification variables.
  

• a50fdb06
  by Simon Peyton Jones at 2026-05-20T17:20:45-04:00

  Major refactor of the Simplifier
  
  The main payload of this patch is to refactor the Simplifer to avoid
  repeated simplification when using Plan (AFTER) for rule rewrites.
  The need for this was shown up by #26989.
  
  See Note [Avoid repeated simplification] in GHC.Core.Opt.Simplify.Iteration.
  
  Related refactoring:
  
  * Refactor the two fields `sc_dup` and `sc_env` in `ApplyToVal` into one, `sc_env`.
    Reason: the envt is irrelevant in the "simplified" case, so the data type describes
    the possiblitiies much more accurately now.
  
  * Some refactoring in `knownCon` to split off `wrapDataConFloats`.
  
  * Refactor `lookupRule` and its auxiliary functions to return `RuleMatch`,
    a new data type. See Note [data RuleMatch] in GHC.Core. Ditto for BuiltinRule.
  
    This RuleMatch returns fragments of the target in rm_args and rm_floats,
    leaving `rm_rhs` to be the stuff from the RULE itself.
  
    Doing this has routine consequences in GHC.Core.Opt.ConstantFold. Many changes
    there but all routine.
  
  * When doing occurrence analysis on RULEs, make the occ-info on the rule
    binders relate just to the RHS, not the LHS.  See (OUR1) in
    Note Note [OccInfo in unfoldings and rules]
  
    This means that Lint must not complain about the fact that the patterns
    in the RULE mentions binders that are marked dead.
    See Note [Dead occurrences] in GHC.Core.Lint.
  
    I changed the Core pretty-printer so that it didn't suppress dead binders,
    else I can't see those binders in RULEs.  That led to quite a lot of testsuite wibbles.
  
  * Refactor FloatBinds, so that it is used both by
    `exprIsConApp_mabye` and by `lookupRule`
    * Move the definition of FloatBinds out of GHc.Core.Make, into GHC.Core.
    * Add FloatTick as an extra constructor.
    * Refactor `lookupRule` to use `FloatBinds` instead of `BindWrapper`.
    This refactor just shares more code.
  
    (Rename GHC.Core.Opt.FloatOut.FloatBinds to FloatLets, to avoid gratuitious
    name clash with GHC.Core.FloatBinds.)
  
  Corecion optimisation
  
  * In simpleOpt, when composing coercions, call new function `optTransCo`.
    This is much lighter weight than full blown coercion optimisation.
  
  * Make `GHC.Core.Opt.Arity.pushCoValArg` and `pushCoTyArg` return the
    coercionLKind of the coercion. This saves recomputing that coercionLKind
    at the key call sites in GHC.Core.Opt.Simplify.Iteration.pushCast.
  
  * Rename `addCoerce` in GHC.Core.Simplify.Iteration to become `pushCast`.
  
  * In the `ApplyToVal` case of `pushCast` we had a very unsavoury call to `simplArg`.
    I eliminated it by adding a field `sc_cast` to `ApplyToVal` that records any
    pending casts.  Much nicer now.  See Note [The sc_cast field of ApplyToVal].
  
  * Don't optimise coercions if the type-substitution is empty.
    See Note [Optimising coercions] in GHC.Core.Opt.Simplify.Iteration.
  
  The fix for #26838 is dramatic.  For the test in perf/compiler/T26839 we have
  
     Compiler allocs:  Before: 7,363M
                       After:    688M
  
  Compile time goes down generally.  Here are compiler-alloc changes
  over 0.5%:
             CoOpt_Read(normal)    729,184,920   -0.7%
       CoOpt_Singletons(normal)    666,916,960   -4.6% GOOD
            LargeRecord(normal)  1,227,056,876   +1.1%
                 T12227(normal)    256,827,604   -4.6% GOOD
                 T12425(optasm)     76,879,410   -0.8%
                 T12545(normal)    787,826,918  -10.8% GOOD
                 T12707(normal)    775,186,464   -0.9%
                 T13253(normal)    318,599,596   -0.8%
                 T14766(normal)    685,857,320   -1.0%
                 T15304(normal)  1,123,333,422   -2.2%
                 T15630(normal)    123,142,330   -2.6%
                T15630a(normal)    123,092,100   -2.6%
                 T15703(normal)    299,751,682   -2.9% GOOD
                 T17516(normal)    964,072,280   +1.0%
                 T18223(normal)    367,016,820   -6.2% GOOD
                 T18730(optasm)    130,643,770   -3.3% GOOD
                 T20261(normal)    535,608,584   -0.7%
                T21839c(normal)    340,340,436   -0.9%
                 T24984(normal)     85,568,392   -1.9%
                  T3064(normal)    174,631,992   -1.2%
                  T3294(normal)  1,215,886,432   -0.7%
                  T5030(normal)    141,449,704  -17.2% GOOD
               T5321Fun(normal)    258,484,744   -1.9%
                  T8095(normal)    770,532,232   -2.7%
                  T9630(normal)    858,423,408  -14.5% GOOD
                 T9872c(normal)  1,591,709,448   +0.7%
    info_table_map_perf(normal) 19,700,614,458   -1.3%
  
                      geo. mean                  -0.7%
                      minimum                   -17.2%
                      maximum                    +1.1%
  
  However, strangely there seems to be a 5.0% increase in CoOpt_Read in
  the x86_64-linux-fedora43-validate+debug_info+ubsan job, although
  there generally a /decrease/ in this test in other builds.  The baseline
  value looks strange.  Anyway I'll just accept it.
  
  Metric Decrease:
      CoOpt_Singletons
      T12227
      T12545
      T12707
      T15703
      T18223
      T18730
      T21839c
      T5030
      T9630
  
  Metric Increase:
      CoOpt_Read
  

• 834623d4
  by Mrjtjmn at 2026-05-20T17:21:41-04:00

  users-guide: Fix weird notation in "Summary of stolen syntax"
  

• 6f9d7c71
  by Markus Läll at 2026-05-21T15:25:34-04:00

  Use "grimily" instead of "grimly"
  
  Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/27221
  

• 50e999ca
  by fendor at 2026-05-21T15:26:18-04:00

  Speed up 'closure' computation in `ghc-pkg`
  
  Cache the set of already seen `UnitId`s and use `Set` operations to
  speed up 'closure' computation.
  
  Further simplify the implementation of 'closure' to account for the
  actual usage.
  As a consequence, we rename 'closure' to 'brokenPackages' to reflect its
  purpose better after the simplification.
  

• 7ecc6184
  by sheaf at 2026-05-21T15:27:10-04:00

  TcMPluginHandling: be more lenient when no plugins
  
  This change ensures that, if a function such as 'typecheckModule' was
  invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM
  plugins having already been stopped, as there were none to start with.
  

• 72c8de5c
  by Simon Jakobi at 2026-05-23T18:41:42-04:00

  Implement List.elem via foldr
  
  ...in order to allow specialization to Eq instances.
  
  The implementation of notElem is updated for consistency.`
  
  Corresponding CLC proposal:
  https://github.com/haskell/core-libraries-committee/issues/412
  
  Addresses #27096.
  

• 3268c610
  by Alan Zimmerman at 2026-05-23T18:42:30-04:00

  EPA: Fix span for qualified multiline string
  
  Fix the span for a qualified multiline string like
  
    Text."""
      I'm a multiline
      Text value
      !
    """
  
  to extend to the end of the entire string, not just the first line.
  
  Closes #27274
  

• 1f096790
  by Alan Zimmerman at 2026-05-23T18:43:20-04:00

  EPA: Fix exact printing namespace-specified wildcards
  
  Ensures correct printing of imports of the form
  
     import Data.Bool (data True(data ..))
     import Data.Bool (data True(type ..))
  
  Closes #27291
  

• 56ada7c0
  by Mrjtjmn at 2026-05-23T18:44:19-04:00

  Fix ambiguous syntax of BangPatterns in users guide
  
  Update documentation for the BangPatterns extension to specify
  how surrounding whitespace affects interpretation of `!`.
  
  * Only when there is whitespace before `!` and no whitespace after,
    it is recognized as a BangPattern.
  * Other cases `⟨varid⟩!⟨varid⟩`, `⟨varid⟩ ! ⟨varid⟩`, `⟨varid⟩! ⟨varid⟩`
    are treated as infix operators.
  

• 579aa0b7
  by Simon Jakobi at 2026-05-25T16:31:26-04:00

  Ensure that SetOps.{minusList,unionListsOrd} can be specialized
  
  ...by marking them INLINABLE. Haddock allocates 0.1–0.3% less as a
  result.
  
  This also removes some redundant constraints on unionListsOrd.
  

• cccf45da
  by Cheng Shao at 2026-05-25T16:32:13-04:00

  wasm: ensure post-linker output is synchronous ESM
  
  This patch fixes wasm backend's post-linker output script to ensure
  it's synchronous ESM and doesn't use top-level await, which doesn't
  work in ServiceWorkers. Fixes #27257.
  

• 8db331a3
  by Zubin Duggal at 2026-05-26T04:54:03-04:00

  Update to semaphore-compat 2.0.0 using v2 of the protocol
  
  On Linux and other POSIX platforms, GHC's -jsem jobserver client now
  speaks v2 of the semaphore-compat protocol, which uses Unix domain
  sockets in place of POSIX named semaphores. This avoids the libc-ABI
  issues that affected the old implementation. Windows is unaffected
  and continues to use the v1 protocol (Win32 named semaphores); its
  reported protocol version remains v1.
  
  When GHC receives a -jsem name whose protocol version it does not
  support, it emits a -Wsemaphore-version-mismatch warning and falls
  back to -j<N> rather than crashing. ghc --info exposes the supported
  version in a new "Semaphore version" entry so cabal-install can detect
  a mismatch before invoking GHC.
  
  Users on a cabal-install that predates the v2 update will continue to
  build successfully on Linux/POSIX, but will lose the cross-process
  -jsem coordination and fall back to -j<N> per GHC invocation. Users
  must upgrade to a cabal-install that supports protocol v2 to recover
  full parallelism.
  
  Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot
  heldTokens and release them before killing the loop, while the loop's
  in-flight acquire/release children could still be mutating it.
  Cleanup now runs inside the loop's own exit handler, after draining
  the active child via a new activeChild TVar, so the snapshot has no
  concurrent mutator.
  
  See also:
    - GHC proposal amendment:  https://github.com/ghc-proposals/ghc-proposals/pull/673
    - cabal-install patch:     https://github.com/haskell/cabal/pull/11628
    - semaphore-compat MR:     https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8
  
  Bump semaphore-compat submodule to 2.0.0
  
  Fixes #25087 and #27253
  

• 17be4f1f
  by Alan Zimmerman at 2026-05-26T04:54:52-04:00

  EPA: Record semicolons in HsModifier
  
  Ensure the semi colons are captured in the ParsedSource for code like
  
    %True;; %False;
    instance C D
  
  It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi
  colons can be recorded as [TrailingAnn]
  
  Also rename pprHsModifiers to pprLHsModifiers to match.
  
  Closes #27294
  

• 8f991755
  by fendor at 2026-05-26T11:02:52-04:00

  Revert prog003 acceptance
  
  We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the
  test, but due to changes to ghci, modules loaded during the GHCi
  session, the test was actually no longer testing what it set out to do,
  "fixing" the broken test.
  
  As modules are added to the `interactive-session` home unit, the object code needs
  to be compiled with `-this-unit-id interactive-session`, otherwise the
  object code won't be used.
  Once this has been fixed in the test, the test fails as expected again.
  

• 277a3687
  by mangoiv at 2026-05-26T11:03:40-04:00

  libraries/process: bump submodule to v1.6.29.0
  
  This submodule bump resolves a segfault on macos 15.
  Fixes #27144
  

• 6779bb0c
  by mangoiv at 2026-05-26T11:03:40-04:00

  libraries/unix: in submodule, don't pick branch 2.7
  
  The 2.7 branch is outdated and the module has been advanced far beyond
  it anyway, so remove that line.
  

• 4a645683
  by Simon Peyton Jones at 2026-05-27T21:41:59-04:00

  Trim the continuation in mkDupableContWithDmds
  
  When there are no remaining argument demands, it means the application
  is bottoming. In this case, we can trim the continuation to avoid the
  panic that was observed in #27261.
  
  See Note [Trimming the continuation for bottoming functions] in
  GHC.Core.Opt.Simplify.Iteration.
  

• 8ab506ff
  by Cheng Shao at 2026-05-27T21:42:47-04:00

  ghci: fix module name string lifetime in hs_hpc_module invocation
  
  This patch makes hpcAddModule pass a properly malloced module name
  string to hs_hpc_module, instead of using useAsCString which causes
  use-after-free of module name string. Fixes #27297.
  
  Co-authored-by: Codex <codex@openai.com>
  

• b0233814
  by sheaf at 2026-05-27T21:43:31-04:00

  Relax acceptance threshold for T10421
  
  As seen in #27289, the 1% acceptance threshold for this text was
  overly narrow, resulting in spurious test failures. This commit widens
  the acceptance threshold to 2%. Fixes #27289.

• 63ce5770
  by Luite Stegeman at 2026-05-28T12:23:35-04:00

  Fixes for black holes
  
   - suspend duplicate work for eager black holes
   - detect eager black holes in checkBlockingQueues
   - don't overwrite existing black holes even if they're not
       in an eager blackhole frame
   - don't deadlock on self when thunk is already blackholed
  
  Fixes #26936
  

• 037a80dc
  by Tom McLaughlin at 2026-05-28T12:24:36-04:00

  Event/Windows.hsc: rethrow exceptions in overlapped IO
  
  This prevents the WinIO manager from swallowing exceptions in overlapped IO. It
  was added to make WinIO support possible in the `network` library. See
  https://gitlab.haskell.org/ghc/ghc/-/issues/27283.
  
  We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP.
  

• 2d53bcdb
  by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00

  Allow `downsweep` to use nodes of an existing module graph
  
  To this end, `downsweep` has not been able to use the nodes of a module
  graph obtained from a previous downsweeping round. In some GHC API
  applications, downsweeping is performed somewhat incrementally and
  therefore could profit from reusing such existing results. This
  contribution makes this possible.
  
  Resolves #27054.
  
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  

• f4fbb583
  by Simon Jakobi at 2026-05-28T12:26:04-04:00

  Add regression test for T11226
  
  Closes #11226.
  

• ed29a5e6
  by Sven Tennie at 2026-05-28T17:30:36-04:00

  Add optional config setting for LibDir (#19174)
  
  Previously, the `libDir` was derived from `topDir`. This won't work for
  inplace stage2 cross-compilers where binaries and libraries are in
  different stage dirs (`_build/stage1/` for executables and
  `_build/stage2` for libraries).
  
  `LibDir` is set in the inplace `settings` files. For bindists, we
  generate a new `settings` file with no `LibDir` entry. GHC then defaults
  to use `topDir` as `libDir` again. This keeps the bindist relocatable.
  
  If `LibDir` is a relative path, it is interpreted relatively to
  `topDir`.
  
  The global package db is part of the `lib/` folder. If we want to point
  for inplace cross-compilers to the succeeding stage's folder, this is
  done by setting `LibDir`. Thus, the global package db must be found
  relative to `libDir`` (which may default to `topDir` or be set by
  `LibDir`).
  
  The complexity of settings becomes scary. So, add a test to ensure
  `LibDir` works as expected.
  

• 8339cf8f
  by Sven Tennie at 2026-05-28T17:30:36-04:00

  Add Haddock to FileSettings
  
  Helping to understand the fields' meanings without deeper analyses.
  

• 4ce251e4
  by Sylvain Henry at 2026-05-28T17:31:39-04:00

  foundation test: skip signed minBound `quot` (-1) (#27222)
  
  `minBound `quot` (-1)` for fixed-width signed integers is platform
  dependent: the mathematical result -minBound is not representable in
  the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in
  this case; on AArch64/RISC-V, SDIV wraps to minBound.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• b8ba7e61
  by Simon Jakobi at 2026-05-28T17:32:23-04:00

  Prevent dictionary-passing in checkTyEqRhs
  
  ...by pre-specializing it to TcM.
  
  Previously, wherever checkTyEqRhs was used in other modules, the
  Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE
  pragma prevents this.
  

• d603477f
  by David Eichmann at 2026-05-29T13:17:12-04:00

  Hadrian: create a ghc-internal .def file per ghc-internal dll
  
  The .def file generated from rts/win32/libHSghc-internal.def.in contains
  the name of the ghc-internal dll. The correct dll name differs based
  on if the dll is inplace/final and if using the Dynamic way. Previously,
  this was not accounted for and inconsistent dlls names where used. That
  led to failure when loading dlls at runtime in experiments with windows
  dynamic linking.
  

• 1fc21753
  by Sylvain Henry at 2026-05-29T13:18:14-04:00

  ghc-bignum: copy backend interface haddocks to Native backend (#27305)
  
  The haddock comments documenting the BigNat backend interface (function
  contracts, expected MutableWordArray# sizes, return-value semantics, etc.)
  were attached to the FFI backend module. Copy them to the Native backend
  so they remain in tree once the FFI backend is removed.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 717059df
  by Sylvain Henry at 2026-05-29T13:18:14-04:00

  ghc-bignum: remove FFI backend (#27305)
  
  The FFI backend of ghc-bignum (now part of ghc-internal) had no known
  users and is easy to recreate by relinking ghc-internal with a custom
  backend. Remove the backend module, the bignum-ffi cabal flag, and the
  ffi option from Hadrian's --bignum selector. The backend interface
  documentation now lives in the Native backend module.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 4bb3b1d8
  by Sylvain Henry at 2026-05-29T13:18:14-04:00

  ghc-bignum: remove Check backend (#27305)
  
  The Check backend of ghc-bignum (now part of ghc-internal) compared the
  selected backend's output against the Native backend for validation.
  It had no known users. Remove the backend module, the bignum-check
  cabal flag, the bignumCheck Hadrian flavour field, and the check-
  prefix in Hadrian's --bignum selector.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 6b3044a0
  by David Eichmann at 2026-05-30T11:58:48-04:00

  Add code comments to allocator code
  

• f4e04210
  by Matthew Pickering at 2026-05-30T11:59:34-04:00

  hadrian: Refactor system-cxx-std-lib rules
  
  I noticed a few things wrong with the hadrian rules for
  `system-cxx-std-lib` rules.
  
  * For `text` there is an ad-hoc check to depend on `system-cxx-std-lib`
  outside of `configurePackage`.
  * The `system-cxx-std-lib` dependency is not read from cabal files.
  * Recache is not called on the packge database after the `.conf` file is
  generated, a more natural place for this rule is `registerRules`.
  
  Treating this uniformly like other packages is complicated by it not
  having any source code or a cabal file. However we can do a bit better
  by reporting the dependency firstly in `PackageData` and then needing
  the `.conf` file in the same place as every other package in
  `configurePackage`.
  
  This commit increases the `shakeVersion`, to provide backwards
  compatibility to previous builds with different PackageData.
  
  Fixes #25303
  
  Co-authored-by: Sven Tennie <sven.tennie@gmail.com>
  

• 576987d0
  by Simon Jakobi at 2026-06-02T04:53:36-04:00

  compiler: use nubOrd from containers
  
  Address #27103 by replacing GHC.Utils.Misc.ordNub[On] with
  Data.Containers.ListUtils.nubOrd[On].
  
  Note that nubOrd suffers from a small inefficiency, a fix for which
  will be included in the next containers release:
  
    https://github.com/haskell/containers/issues/1202
  

• deea53c3
  by David Eichmann at 2026-06-02T04:54:22-04:00

  Hadrian: disable response files for GHC/Haddock builders on non-Windows
  
  This makes debugging build errors easier on non-windows hosts.
  See issue #27230
  

• f2f5c6ba
  by Nikita Efremov at 2026-06-02T16:04:54+00:00

  fix typo : compete with performance, not complete

• 5524ea0e
  by Wolfgang Jeltsch at 2026-06-03T08:01:26-04:00

  Make the current `base` buildable with GHC 9.14
  
  This comprises the following changes:
  
    * Disable some imports into `GHC.Base` for GHC 9.14
    * Disable some imports into `Prelude` for GHC 9.14
    * Disable separate `ArrowLoop` import for GHC 9.14
    * Disable `GHC.Internal.STM` import for GHC 9.14
    * Disable `GHC.Internal.Unicode.Version` import for GHC 9.14
    * Disable `GHC.Internal.TH.Monad` import for GHC 9.14
    * Add alternative `fixIO` import for GHC 9.14
    * Add alternative `unsafeCodeCoerce` import for GHC 9.14
    * Disable hiding of imported SIMD operations for GHC 9.14
    * Disable use of GHC 9.14’s `printToHandleFinalizerExceptionHandler`
    * Enable use of `getFileHash` from `ghc-internal` for GHC 9.14
    * Make `thenA` available for GHC 9.14
    * Make `thenM` available for GHC 9.14
    * Disable translation of `IoManagerFlagPoll` for GHC 9.14
    * Add `hGetNewlineMode` for GHC 9.14
  

• d3438055
  by Enrico Maria De Angelis at 2026-06-03T08:02:17-04:00

  Fix #27067 - Clarify haddocks on `minusNaturalMaybe`
  

• f9bcfac2
  by sheaf at 2026-06-03T14:47:19-04:00

  Avoid mkTick in Core Prep breaking ANF
  
  As discovered in #27182, mkTick can break ANF. This patch introduces a
  variant of mkTick that skips the single optimisation that could break
  ANF. This is preferrable over switching to the raw Tick constructor,
  as the latter may introduce spurious cost centres in profiling reports.
  
  This is a temporary measure until we more thoroughly refactor how
  mkTick works (see #27141).
  
  See Note [mkTick breaks ANF] in GHC.CoreToStg.Prep.
  
  Fixes #27182
  

• cf1fd661
  by Artem Pelenitsyn at 2026-06-03T14:48:09-04:00

  clarify comment for getSizeofMutableByteArray#: we get the size in bytes, not "elements"

• a3b431f3
  by David Eichmann at 2026-06-04T10:10:19+00:00

  Hadrian: convert env variable ACLOCAL_PATH to unix paths.
  
  Convert ACLOCAL_PATH to a unix style path when invoking autoreconf.
  Autoreconf doesn't handle windows paths.
  See Note [Autoreconf unix paths from ACLOCAL_PATH].
  
  Fixes #27311
  

• 18f6138a
  by Simon Jakobi at 2026-06-04T20:20:31-04:00

  testsuite: Deduplicate --only test names
  
  config.only is assumed to be a set, but supplying --only overwrote it
  with the (list) argparse result, which can contain duplicates. When a
  test ran, config.only.remove(name) dropped only the first occurrence,
  so a duplicated name lingered and was later misreported as a
  "test not found" framework failure. Store it as a set instead.
  
  Fixes #27322
  
  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
  

• 2f3cc9ff
  by Simon Jakobi at 2026-06-08T07:55:49-04:00

  testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum
  
  The ghc-bignum package was merged into ghc-internal, so the BIGNUM_GMP
  probe in test.mk ran `ghc-pkg field ghc-bignum exposed-modules`, which
  fails with "cannot find package ghc-bignum". That error went to stderr
  and leaked into the captured stderr of every makefile_test, causing
  spurious [bad stderr] failures across the suite. The probe also silently
  returned empty, so config.have_fast_bignum was wrongly False even on GMP
  builds.
  
  Probe ghc-internal's extra-libraries for the gmp library instead: the
  GMP backend module is an other-module (not exposed), but GMP_LIBS adds
  gmp to extra-libraries only on a GMP build, so this distinguishes the
  backends. Redirect stderr to keep any future missing-package error off
  the harness's stderr.
  
  This also removes a stale comment as per suggestion from hsyl20.
  
  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
  

• eb3bf6e7
  by Alan Zimmerman at 2026-06-08T07:56:32-04:00

  EPA: Rename Transform.anchorEof to addModuleCommentOrigDeltas
  
  This now matches what it actually does.
  

• 498bb21a
  by David Eichmann at 2026-06-09T18:02:39-04:00

  Hadrian: avoid response files when command line is short enough
  
  This replaces the logic of always using response files on Windows.
  With the new condition based on command line lenght, reponse files
  can be avoided in many more cases (on windows).
  
  Now that response files are only used in a small number of cases,
  response files are always kept and the -r / --keep-response-files
  command line options have been removed
  
  The response file paths are nolonger randomized. They are placed in the
  `_build/rsp` directory. This ensures they are ignored by git and we
  that Hadrian reuses response file paths when rebuilding rather than
  leaving stale response files around.
  
  Update user guide putting response files in its own section
  

• 87f510a5
  by Simon Hengel at 2026-06-09T18:03:25-04:00

  Don't use non-breaking spaces
  

• 41a19379
  by David Eichmann at 2026-06-09T18:04:11-04:00

  Hadrian: remove unused wrapper scripts from windows bindist
  
  These wrapper scripts are only installed on non-relocatable builds
  which are not generally supported on windows.
  

• ce01ccb6
  by sheaf at 2026-06-10T05:08:48-04:00

  Don't drop ticks around variables of type `IO ()`
  
  GHC.Core.Utils.mkTick is responsible for placing a tick on a Core
  expression. It contains logic for dropping SCCs (non-counting profiling
  ticks) around non-function variables, as such variables cannot
  meaningfully contribute to profiles. However, the logic for what counts
  as a function was incorrect: it used `isFunTy` which returns 'False' for
  types such as 'IO ()' where the function arrow is hidden under a
  newtype.
  
  We now use 'mightBeFunTy' instead of 'isFunTy'. This ensures we don't
  drop ticks in cases we aren't sure.
  
  On the way, we improve the documentation of 'isFunTy', 'isPiTy' and
  'mightBeFunTy', and update the latter's implementation to consistently
  handle unary classes.
  
  Fixes #27225
  
  -------------------------
  Metric Decrease:
      T5642
  -------------------------
  

• d311c4f1
  by Simon Jakobi at 2026-06-10T05:09:32-04:00

  testsuite: Add regression test for #4081
  
  Check that a strict constructor field is unboxed once outside an
  enclosing loop, not re-inspected each iteration (the float-out
  case-floating from 9cb20b488). Uses simonpj's `data T a = T !a` example
  from the ticket; T4081.stderr captures the expected Core.
  
  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
  

• 333df444
  by sheaf at 2026-06-10T05:10:25-04:00

  Check for cabal-install >= 3.12 upfront
  
  Starting with commit 8cb99552f607f6bc4000e45ab32532d50c8bb996, Hadrian
  requires cabal-install >= 3.12 in order to use the 'cabal path' command
  that was introduced in version 3.12, as per
    https://github.com/haskell/cabal/blob/a51c4ee1556d816ad86e90db7e6330dd51b0b6e7/release-notes/cabal-install-3.12.1.0.md?plain=1#L45
  
  This was not reflected in the Hadrian build script, causing a delayed
  build failure instead of enforcing the version requirement upfront,
  which this patch does.
  
  Fixes #27317
  

• 98c20394
  by sheaf at 2026-06-10T05:11:09-04:00

  Fix crash in Data.Data instance for HsCtxt
  
  The Data.Data instance for HsCtxt contained an error for the 'toConstr'
  method, which could trigger for example when looking at -ddump-tc-ast
  traces. Replace it with the 'abstractConstr' pattern used in the rest of
  the codebase.
  

• 5ac9ce7d
  by Zubin Duggal at 2026-06-10T21:26:32+05:30

  hadrian: Remove old package.conf files when generating new ones
  
  Old package.conf files might exists with different hashes, causing issues like #26661
  
  Fixes #26661
  

• c9015f09
  by sheaf at 2026-06-11T12:40:28-04:00

  Fix AArch64 clobbering bug for MUL2
  
  On AArch64, the code generator could clobber one of the input operands
  when computing the lower bits of a MUL2 operation. This rendered invalid
  the subsequent computation of the high bits.
  This commit fixes that by using a temporary register. The register
  allocator can remove the redundant move in the common case when the
  registers do not conflict.
  
  Fixes #27046
  

• 7ab90288
  by Rodrigo Mesquita at 2026-06-11T12:41:11-04:00

  fix: make T27131 less flaky
  
  It seems that T27131 fails flakily in a race where we check the flag
  before the capability had the chance to process the mailbox which sets
  the flag. This seemingly should only happen if the capability ends up
  being the same for setting and checking the flag.
  

• 8965cb76
  by Marc Scholten at 2026-06-12T04:53:22-04:00

  haddock: render modules concurrently
  

• 8cc0b64a
  by Duncan Coutts at 2026-06-12T04:54:06-04:00

  Promote HAVE_PREEMPTION from Timer.c to OSThreads.h
  
  We will want to know about HAVE_PREEMPTION in more places.
  
  HAVE_PREEMPTION tells us that we do have OS threads available,
  irrespective of whether THREADED is defined. In particular,
  HAVE_PREEMPTION is defined on all proper OSs, but not on WASM (and
  hyopthetically may not be true on some other platforms like
  micro-controllers, RTOSs, VM hypervisors etc).
  

• cce574ed
  by Duncan Coutts at 2026-06-12T04:54:06-04:00

  Define ACQUIRE_LOCK_ALWAYS and friends
  
  Fix issue #27335
  
  Like the atomic _ALWAYS variants, these lock actions are always defined,
  rather than being dependent on whether we are in the THREADED case. All
  the "normal" LOCK macros are defined to be no-ops when !THREADED.
  
  The use case for the _ALWAYS variants is where we are using OS threads
  even in the non-threaded RTS. This includes everything to do with the
  timer/ticker thread, which is used in the non-threaded RTS too.
  
  In particular, we will want to use this for eventlog things, because the
  timer thread performs eventlogging concurrently with the main
  capability, even in the non-threaded RTS.
  

• 1f28d1f6
  by Duncan Coutts at 2026-06-12T04:54:06-04:00

  Use ACQUIRE/RELEASE_LOCK_ALWAYS with eventBufMutex
  
  Even in the non-threaded RTS the eventBufMutex is needed by both the
  main capability and the timer/ticker thread, so always use the mutex.
  
  This should fix #25165 which is about the main capability and the timer
  thread posting events to the eventlog buffer concurrently and thereby
  corrupting the buffer data.
  

• 0ff29782
  by Duncan Coutts at 2026-06-12T04:54:06-04:00

  Expose eventBufMutex in the EventLog interface/header
  
  We will need it in forkProcess to ensure we don't write to the global
  eventlog buffer concurrently with trying to flush eventlog buffers and
  do the fork().
  

• 7a688395
  by Duncan Coutts at 2026-06-12T04:54:07-04:00

  Split flushAllCapsEventsBufs into safe and unlocked version
  
  Following the convention that unlocked versions have a trailing _
  underscore in their name. This one requires the caller to hold the
  eventlog global buffer mutex. We will need this in forkProcess.
  

• 341ed474
  by Duncan Coutts at 2026-06-12T04:54:07-04:00

  Remove redundant use of stopTimer in setNumCapabilities
  
  Historically, the comment here was:
  
    We must stop the interval timer while we are changing the
    capabilities array lest handle_tick may try to context switch
    an old capability. See #17289.
  
  and
  
    We must disable the timer while we do this since the tick handler may
    call contextSwitchAllCapabilities, which may see the capabilities array
    as we free it.
  
  What this refers to is that historically, when changing the number of
  capabilities, the array of capabilities was reallocated to a new size,
  allocating new ones and freeing the old ones, thus invalidating all
  existing capbility pointers.
  
  Strangely, for good measure the code used to call stopTimer twice (hence
  the two similar comments above).
  
  However, since commit a3eccf06292dd666b24606251a52da2b466a9612, the
  capabilities array is no longer reallocated. Instead the array is
  allcoated once on RTS startup to the maximum size it could ever be
  allowed to be, and then capabilities get enabled/disabled at runtime. So
  the capability pointers never become invalid anymore. At worst, they may
  point to capabilities that are disabled.
  
  Thus we no longer need to stop the timer (twice) while we change the
  number of enabled capabilities. This also partially solves issue #27105,
  which notes that stopTimer is being used as if it were synchronous, when
  it is not. At least for this case, the solution is that stopTimer is not
  needed at all!
  

• 674858e3
  by Duncan Coutts at 2026-06-12T04:54:07-04:00

  Remove redundant use of stopTimer in forkProcess
  
  but replace it with taking the eventlog buffer lock during the fork.
  
  Fixes issue #27105
  
  The original reason to block the timer during a fork was that
  historically the timer was implemented using a periodic timer signal,
  and the signal itself would interrupt the fork system call (returning
  EINTR). For large processes (where fork() takes a while) this could
  permanently livelock: the timer always would go off before the fork
  could complete, which got retried in a loop forever.
  
  The timer is no longer implemented as a unix signal, but uses threads.
  Thus the original problem no longer exists. The only remaining reason to
  block the timer tick is to prevent actions taken by the tick from
  interfering with the delicate process involved in fork (taking a load of
  locks and pausing everything).
  
  The only thing we need to do is to prevent the eventlog from being
  written to or flushed while the fork is taking place. To achieve this
  all we need to do is hold the mutex for the global eventlog buffer.
  
  This removes the last use of stopTimer that expects stopTimer to work
  synchronously (which it was not) and thus solves issue #27105. To be
  clear, we solve issue #27105 not by making stopTimer synchronous, but by
  eliminating the use sites that expected it to be synchronous.
  

• 40764930
  by sheaf at 2026-06-12T14:54:43-04:00

  Add type family performance test for #26426
  
  Some GHC versions produced large numbers of coercions after typechecking
  and desugaring when compiling the program in #26426:
  
  Version | Typechecker time | Typechecker allocations | Coercions
  -------:|-----------------:|------------------------:|---------:
  9.6     |   47 ms          |  48 MB                  |    110k
  9.8     | 1000 ms          | 486 MB                  | 10,437k
  9.10    |  922 ms          | 489 MB                  | 10,436k
  9.12    |  906 ms          | 482 MB                  | 10,437k
  9.14    |   63 ms          |  55 MB                  |    333k
  10.0    |   47 ms          |  64 MB                  |     35k
  
  The improvement 9.12 -> 9.14 was due to commit 22d11fa818fae2c95c494fc0fac1f8cb4c6e7cb6,
  while the improvement 9.14 -> 10.0 was due to commit 0b7df6db9e46df40e86fbff1a66dc10440b99db5.
  
  As the behaviour of GHC seems better than it's ever been on this program,
  we declare victory, adding this performance test to ensure we don't
  regress on this program.
  
  On the way, we update Note [Combining equalities] in GHC.Tc.SolveR.Equality
  with the explanation of the 9.12 -> 9.14 improvement (getting rid of an
  exponential blowup in coercion sizes), and we update
  Note [Exploiting closed type families] in GHC.Tc.Solver.FunDeps with
  the explanation of the 9.14 -> 10.0 improvement (bringing down coercion
  size growth from cubic to quadratic).
  

• 0f3d0a71
  by Zubin Duggal at 2026-06-12T14:55:30-04:00

  compiler: mark tool messages as errors/warnings depending on the exit code
  
  Fixes #27370
  

• d9ea2d76
  by mangoiv at 2026-06-13T04:41:51-04:00

  libraries/process: bump submodule to v1.6.30.0
  
  - bump the submodule to the appropriate tag
  - suppress benign warning resulting from the change
  

• 6ebaaba3
  by David Eichmann at 2026-06-13T04:42:37-04:00

  ghc-toolchain: don't throw when candidate executables are not found
  
  Fixes #27369
  

• 6c65e1e1
  by David Eichmann at 2026-06-13T04:43:23-04:00

  CI: lint-changelog checks for no-changelog label in script instead of rules
  

• bab37cc6
  by konsumlamm at 2026-06-13T19:10:21+02:00

  Implement CLC proposal #378
  
  Add `Data.Double` and `Data.Float` modules
  Document that GHC uses IEEE 754
  

• fb5246ad
  by fendor at 2026-06-15T18:07:23-04:00

  Drop `preloadClosure` from `UnitState`
  
  It is always hard-coded to the same value.
  
  Backpack Unit instantiation isn't using it any more.
  Allows us to simplify the API and get rid of `improveUnit`.
  

• 291ce3aa
  by ARATA Mizuki at 2026-06-15T18:08:26-04:00

  RISC-V NCG: Zero-extend the result of castFloatToWord32
  
  According to the ISA manual, FMV.X.W sign-extends the result.
  We need to truncate the result to avoid creating an exotic Word32 value.
  
  Fixes #27300
  

• 011be91f
  by ARATA Mizuki at 2026-06-15T18:08:26-04:00

  RISC-V NCG: Treat d28-d31 (ft8-ft11) as caller-saved
  
  According to the calling convention, the registers d28-d31 (ft8-ft11) are caller-saved.
  
  Fixes #27306
  

• e8a54713
  by ARATA Mizuki at 2026-06-15T18:08:26-04:00

  RISC-V NCG: Set rounding mode when emitting `truncate`
  
  If we omit the rounding mode for `fcvt`, `dyn` will be used.
  We do not want that for `truncate`, so we set `rtz`.
  In other places, we set `rne` because we do not use the dynamic rounding mode.
  
  Fixes #27303
  

• 9438bec7
  by Zubin Duggal at 2026-06-15T18:09:11-04:00

  rts: fix validate build with gcc 16. `__attribute__((regparm(1)))` is ignored on x86_64 and now
  gcc warns that it is ignored:
  
  rts/sm/Evac.h:35:1: error:
       error: ‘regparm’ attribute ignored [-Werror=attributes]
  
  See https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ccead81bbc39668376eb5cf47066acb446cc43f3
  
  Fixes #27366
  

• 893e6133
  by Andrew Lelechenko at 2026-06-15T23:55:36+01:00

  base: more NonEmpty zips
  
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/409
  

• 1314f2fd
  by David Eichmann at 2026-06-16T05:46:52-04:00

  Hadrian: fix ghc-internal .def file name
  

• 7f72bcb3
  by mangoiv at 2026-06-16T05:47:39-04:00

  compiler: ignore camelCase and Eta reduce hlint hints
  
  These do not cohere with the style used in GHC. After disabling them,
  hlint lints are much less noisy again.
  

• 842bef9f
  by Alan Zimmerman at 2026-06-16T05:48:25-04:00

  EPA: Use standard type family declaration for Anno
  

• f6d30767
  by Wolfgang Jeltsch at 2026-06-16T15:32:34-04:00

  Fix two issues in the documentation of pipeline interruption
  
  One issue is a typo (“interreuptible”), the other one the lack of an end
  of a sentence, which has been reconstructed from the message of
  633bbc1fd4762a2bb73ba1c5b9e0c279f1dd3c40, the commit that introduced
  said documentation.
  

• a3fa10e0
  by Christian Georgii at 2026-06-16T15:33:26-04:00

  Find plugins in sibling home units in multiple-home-unit sessions
  
  In a multiple-home-unit session (e.g. `cabal repl --enable-multi-repl` or HLS), enabling a plugin with -fplugin that is defined in (or reexported by) another home unit failed with a "hidden package" error. The plugin module finder only searched the current home unit and the registered external packages, never the sibling home units.
  
  findPluginModuleNoHsc now searches the home units that the current home unit depends on, following module reexports and respecting hidden modules, exactly as ordinary import resolution does in findImportedModuleNoHsc. To avoid two divergent copies of this logic, the shared home-unit search (the current home unit first, then its dependencies in priority order, with the accompanying ordering invariant) is extracted into findHomeModuleAmongDeps, which both findImportedModuleNoHsc and findPluginModuleNoHsc now call.
  
  Add testsuite/tests/driver/multipleHomeUnits/plugin01, which loads a plugin as byte-code from a sibling home unit, and plugin02, in which the consumer enables a plugin reexported by a sibling home unit without depending on the plugin's own home unit directly.
  
  Fixes #27349
  

• d216412b
  by Ian-Woo Kim at 2026-06-16T20:25:57-04:00

  Make the order of usages deterministic
  
  It has been observed that the ordering of usages can be non-determinstic
  in parallel builds. Therefore, this contribution introduces sorting of
  usages based on a platform- and race-independent sorting criterion.
  
  Resolves #26877.
  
  Co-authored-by: Wolfgang Jeltsch <wolfgang@well-typed.com>
  

• 8e1cc105
  by Wolfgang Jeltsch at 2026-06-16T20:25:57-04:00

  Change the descriptions of two existing changelog entries
  
  The descriptions now describe the changes in a user-friendly manner, as
  opposed to describing the contributions that led to these changes in a
  developer-friendly manner.
  

• 636c1c7a
  by Ian Duncan at 2026-06-16T20:26:50-04:00

  AArch64: use SXTH, not SXTW, for W32 signExtendReg
  
  signExtendReg was using SXTH (sign-extend halfword, 16-bit) for
  W32-to-W64 sign extension. This should be SXTW (sign-extend word,
  32-bit). SXTH only sign-extends the lower 16 bits, producing wrong
  results for 32-bit values whose bit 15 differs from bit 31.
  
  Other fixes:
  
    - At sub-W64, code gen for MO_S_Mul2 should use W32 registers for
      SMULL source operands as per the ARM spec (SMULL Xd, Wn, Wm),
      and not W64.
  
    - Ensure signExtendReg uses the source width for the source operand
      in SXTW/SXTH/SXTB instructions. GNU as requires sxtw Xd,Wn (not
      sxtw Xd,Xn), while LLVM's integrated assembler on macOS is lenient.
  
    - Fix overflow flag computation for `MO_S_Mul2`. The overflow bit
      was exactly inverted for sub-W64 operands.
  
  Fixes #26978 and #27047
  

• b734c75d
  by Igor Ranieri at 2026-06-16T20:27:32-04:00

  haddock: Update CONTRIBUTING with missing step, add missing test
  dependency
  

• 7fe4f2ec
  by Luite Stegeman at 2026-06-17T05:35:09-04:00

  tag inference: don't confuse functions with their return values
  
  inferTagRhs was mixing up taggedness for closures and return values
  for function closures. We really shouldn't assign TagTuple to a
  properly tagged function returning a tuple.
  
  We fix this by keeping track of functions (TagFun) separately from
  values (TagVal) and keeping track of their return value. TagFun is
  also used for join points.
  
  fixes #27005
  

• 4671c126
  by Sebastian Graf at 2026-06-17T05:35:55-04:00

  Seed the simplifier's in-scope set for open expressions
  
  simplifyExpr simplifies expressions typed at the GHCi prompt and the
  results of Template Haskell splices. Such an expression may be open: at a
  GHCi debugger breakpoint its free variables include RuntimeUnk skolems
  standing for as-yet-unknown types.
  
  The simplifier began with an in-scope set holding only the wildcard
  binder, so when it instantiated the unsafeCoerce# wrapper that GHCi
  builds around a result, it formed a substitution whose range mentioned a
  free skolem that was not in scope. That breaks the substitution invariant
  and, in a compiler built with assertions, trips substTy's sanity check.
  
  Seed the initial in-scope set with the free variables of the expression.
  For a closed expression this adds nothing.
  
  See Note [Seed the in-scope set for open expressions].
  
  Fixes #17833 and its duplicate #21118.
  

• 67d41299
  by Sebastian Graf at 2026-06-18T05:18:24-04:00

  Desugar a `case` scrutinee only once (#27383, #20251)
  
  In `dsExpr` for `HsCase` we desugared the scrutinee /twice/: once to
  build the Core `case` itself, and again inside `matchWrapper`, which
  re-desugared the source scrutinee (via `addHsScrutTmCs`) purely to
  record long-distance information for the pattern-match checker.
  
  For a single `case` that is merely wasteful.  But for nested cases it
  is catastrophic.  Consider
  
      case (case (case e of ... ) of ... ) of ...
  
  Desugaring the outer scrutinee desugars the middle `case` twice, each
  of which desugars the inner `case` twice, and so on.  The work doubles
  at every level, so desugaring takes O(2^n) time in the nesting depth.
  That is the blowup reported in #27383; it is also what makes the
  machine-generated program in #20251 take an age to compile.
  
  The fix is simple.  `matchWrapper` is handed the scrutinee anyway, so
  we give it the Core expression we have /already/ desugared, and record
  the long-distance term constraint with `addCoreScrutTmCs` instead of
  re-desugaring from source.  This is just what `matchSinglePatVar`
  already does for single-pattern matches.
  
  So:
  
  * `matchWrapper` now takes `Maybe [CoreExpr]` rather than
    `Maybe [LHsExpr GhcTc]`.
  
  * The `HsCase` equation of `dsExpr` passes the already-desugared
    `core_discrim`; the arrow desugarer passes its match variables.
  
  * `addHsScrutTmCs` had no other use, so it is gone.
  
  Desugaring is now linear in the nesting depth.  (The coverage checker
  still runs `simpleOptExpr` over each scrutinee, which leaves the total
  at O(n^2); that is ample.)  The long-distance information itself is
  unchanged: the checker sees precisely the Core that backs the
  generated code.
  
  Test: deSugar/should_compile/T27383
  

• fa5defde
  by Rodrigo Mesquita at 2026-06-18T05:19:11-04:00

  fix: Save FastStrings in the PMC
  
  There is no point in adding the unique to the occurrence FastString we
  create, since it is part of the Id anyway.
  
  Adding it to the FastString, meant each FastString was unique
  unnecessarily!
  
  In a separate branch, running the compiler on test `InstanceMatching`
  observed 30000 `FastString`s created by this code path.
  
  Plus, `fsLit "pm"` follows the existing pattern in `mkPmId`.
  

• 4efb4a66
  by Alan Zimmerman at 2026-06-18T14:41:14-04:00

  TTG: Add extension points to HsConDetails
  
  Extend HsConDetails as
  
      data HsConDetails p arg rec
        = PrefixCon !(XPrefixCon p) [arg]    -- C @t1 @t2 p1 p2 p3
        | RecCon    !(XRecCon p)    rec      -- C { x = p1, y = p2 }
        | InfixCon  !(XInfixCon p)  arg arg  -- p1 `C` p2
        | XHsConDetails !(XXHsConDetails p)
  
      type family XPrefixCon      p
      type family XRecCon         p
      type family XInfixCon       p
      type family XXHsConDetails  p
  

• c8d27dd4
  by Simon Jakobi at 2026-06-18T14:41:59-04:00

  CI: quiet submodule clean output in after_script and setup
  
  The clean and cleanup_submodules functions ran 'git submodule foreach
  git clean -xdf', flooding the job log with 'Entering ...' and
  'Removing ...' lines. Pass --quiet to 'git submodule' and -q to 'git
  clean' to drop the success output; errors are still reported.
  
  Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
  

• 09326ca6
  by Matthew Pickering at 2026-06-20T23:41:12+02:00

  Add missing req_interp modifier to T18441fail3 and T18441fail19
  
  These tests require the interpreter but they were failing in a different
  way with the javascript backend because the interpreter was disabled and
  stderr is ignored by the test.
  

• 521e55bf
  by Matthew Pickering at 2026-06-20T23:41:13+02:00

  hadrian: Fill in more of the default.host toolchain file
  
  When you are building a cross compiler this file will be used to build
  stage1 and it's libraries, so we need enough information here to work
  accurately. There is still more work to be done (see for example, word
  size is still fixed).
  

• 23c9b6c3
  by Matthew Pickering at 2026-06-20T23:42:52+02:00

  hadrian: Build stage 2 cross compilers
  
  * Most of hadrian is abstracted over the stage in order to remove the
    assumption that the target of all stages is the same platform. This
    allows the RTS to be built for two different targets for example.
  * Abstracts the bindist creation logic to allow building either normal
    or cross bindists. Normal bindists use stage 1 libraries and a stage 2
    compiler. Cross bindists use stage 2 libararies and a stage 2
    compiler.
  * hadrian: Make binary-dist-dir the default build target. This allows us
    to have the logic in one place about which libraries/stages to build
    with cross compilers. Fixes #24192
  
  New hadrian target:
  
  * `binary-dist-dir-cross`: Build a cross compiler bindist (compiler =
    stage 1, libraries = stage 2)
  
  This commit also contains various changes to make stage2 compilers
  feasible.
  
  -------------------------
  Metric Decrease:
      LinkableUsage02
      ManyAlternatives
      ManyConstructors
      MultiComponentModulesRecomp
      MultiLayerModulesRecomp
      RecordUpdPerf
      T10421
      T12150
      T12227
      T12425
      T12707
      T13035
      T13379
      T13820
      T15703
      T16577
      T18140
      T18282
      T18698a
      T18698b
      T18923
      T1969
      T20049
      T21839c
      T3294
      T4801
      T5030
      T5321FD
      T5321Fun
      T5631
      T5642
      T6048
      T783
      T9020
      T9198
      T9233
      T9630
      T9872d
      T9961
      parsing001
      T3064
  
  Metric Increase:
      T26989
      hard_hole_fits
  -------------------------
  
  Co-authored-by: Sven Tennie <sven.tennie@gmail.com>
  

• 26fed8ab
  by Matthew Pickering at 2026-06-20T23:42:52+02:00

  ci: Test cross bindists
  
  We remove the special logic for testing in-tree cross
  compilers and instead test cross compiler bindists, like we do for all
  other platforms.
  

• 80c8910e
  by Matthew Pickering at 2026-06-20T23:42:52+02:00

  ci: Introduce CROSS_STAGE variable
  
  In preparation for building and testing stage3 bindists we introduce the
  CROSS_STAGE variable which is used by a CI job to determine what kind of
  bindist the CI job should produce.
  
  At the moment we are only using CROSS_STAGE=2 but in the future we will
  have some jobs which set CROSS_STAGE=3 to produce native bindists for a
  target, but produced by a cross compiler, which can be tested on by
  another CI job on the native platform.
  
  CROSS_STAGE=2: Build a normal cross compiler bindist
  CROSS_STAGE=3: Build a stage 3 bindist, one which is a native compiler and library for the target
  

• 8215573d
  by Sven Tennie at 2026-06-20T23:42:52+02:00

  ci: Increase timeout for emulators
  
  Test runs with emulators naturally take longer than on native machines.
  
  Generate jobs.yml
  

• 5acb7dbc
  by Matthew Pickering at 2026-06-20T23:42:52+02:00

  ci: Javascript don't set CROSS_EMULATOR
  
  There is no CROSS_EMULATOR needed to run javascript binaries, so we
  don't set the CROSS_EMULATOR to some dummy value.
  

• 48345343
  by Sven Tennie at 2026-06-20T23:42:52+02:00

  Javascript skip T23697
  
  See #22355 about how HSC2HS and the Javascript target don't play well
  together.
  

• 5e44fd05
  by Sven Tennie at 2026-06-20T23:42:52+02:00

  Mark T24602 as fragile
  
  It was skipped before (due to CROSS_EMULATOR being set, which changed
  for JS), so we don't make things worse by marking it as fragile.
  

• ab349ec2
  by Sven Tennie at 2026-06-20T23:42:52+02:00

  Fix T22744 for GHCJS
  
  In fact, this test needs Template Haskell, not necessarily an
  interpreter.
  

• c73352d8
  by Sven Tennie at 2026-06-20T23:42:52+02:00

  haddock-test: fix GHCJS haddock test failures
  
  Add --ghc-pkg-path flag support so haddock test runner can find
  cross-prefixed ghc-pkg (e.g. javascript-unknown-ghcjs-ghc-pkg) which
  is not on $PATH in cross install directories.
  
  Skip haddockHtmlTest on GHCJS: Threaded.hs uses forkOS in a TH splice,
  which GHCJS RTS doesn't support. Mark with js_skip in all.T.
  

• 5e814e76
  by Andreas Klebinger at 2026-06-22T23:00:24-04:00

  compiler: Deduplicate hscTidy
  
  This function was accidentally duplicated during a refactor.
  
  Fixes #27351
  

• 473b97eb
  by sheaf at 2026-06-22T23:01:22-04:00

  Avoid mkTick in Core Prep breaking ANF (part II)
  
  Hotfix for 2f9579765f55b3920ceb2e04995ff41a9d0e2d4e fixing a small
  oversight in the call to tickTickedExpr from mkTick, in which we
  improperly recursively called mkTick without passing on the preserve_anf
  flag.
  
  Fixes #27386
  

• 9284a1f7
  by Simon Hengel at 2026-06-23T05:55:33-04:00

  Don't use global variables to address concurrency bugs! (fixes #27234)
  
  This was originally introduce with
  88f38b03025386f0f1e8f5861eed67d80495168a to address #17922.
  
  In this specific case a better fix would have been to synchronize on
  stderr:
  
      withHandle_ "stderrSupportsAnsiColors" stderr $ \ _ -> do
        ...
  
  But apparently the dependency on `terminfo` was removed in
  32ab07bf3d6ce45e8ea5b55e8095174a6b42a7f0, preventing #17922 in the first
  place.
  

• 44309cd3
  by Alan Zimmerman at 2026-06-23T05:56:20-04:00

  EPA: remove LocatedL / SrcSpanAnnL and  LocatedLI / SrcSpanAnnLI
  
  This is part of a refactor towards only having LocatedA / SrcSpanAnnA
  
  It removes the stated items, but has to add back one for BooleanFormula,
  LocatedBF / SrcSpanAnnBF
  
  This commit also use the HsConDetails RecCon extension point to
  capture the braces in a record constructor
  

• 2f6a5534
  by Simon Jakobi at 2026-06-23T15:46:20+02:00

  Add -dstable-core-dump-order for stable Core dump ordering (#27296)
  
  The order of top-level bindings in Core dumps (-ddump-simpl etc.) is the
  compiler's Unique-sensitive internal processing order, so an unrelated
  upstream change can reorder them and defeat a textual diff of two dumps.
  
  This adds an opt-in flag -dstable-core-dump-order that reorders the
  top-level bindings of dumps routed through dumpPassResult into a stable,
  Unique-independent order, so two dumps line up across rebuilds. See
  Note [Stable Core dump order] in GHC.Core.Ppr for the sort key and its
  rationale.
  
  Adds tests T27296 (binders GHC emits in non-source order by default,
  asserted to come out stably ordered under the flag) and T27296b (an
  untidied -ddump-float-out dump pinning the ordering of the anonymous lvl
  floats by literal value).
  
  Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
  

• 141986e3
  by mangoiv at 2026-06-24T15:51:14-04:00

  compiler: refactor error reporting code for ExplicitLevelImports
  
  Refactors error reporting code for ExplicitLevelImports to pass in a
  RdrName and a GlobalReaderElt to be able to report errors that are
  faithful to the source and to more precisely distinguish between names
  that are in scope from different qualifications.
  
  Fixes #27385 and #26616
  

• aa7df6b6
  by Simon Hengel at 2026-06-24T15:52:18-04:00

  Set GHC_VERSION when calling custom pre-processors (see #25952)
  
  (so that pre-processors can emit backwards compatible code)
  

• a9e494f2
  by Simon Hengel at 2026-06-24T15:54:08-04:00

  Add a flag to control GHCi specific error hints (close #27409)
  

• a805b2a2
  by Simon Hengel at 2026-06-24T15:55:20-04:00

  Reference correct package in error messages for reexported modules
  
  (fixes #27417)
  

• f235d183
  by Simon Jakobi at 2026-06-25T05:51:18-04:00

  Add explicit setBit/clearBit/complementBit for instance Bits Integer (#21176)
  
  The default setBit, clearBit, and complementBit methods allocate
  intermediate Integers per call. Define them explicitly via the new
  integerSetBit[#], integerClearBit[#] and integerComplementBit[#], built
  on the BigNat# primitives, which avoid those allocations. Allocation is not
  eliminated entirely -- the negative (IN) cases would need in-place mutation,
  which is left as future work.
  
  The default methods constant-folded on literal arguments via the
  integerOr/integerAnd/integerXor rules, which fold literal Integers of any
  size. The explicit functions have no such rule, so they (their Word-argument
  wrappers, and the Bits Integer methods) are marked INLINE to expose the
  underlying primops to the simplifier; see Note [INLINE for constant folding
  of bit operations]. This restores folding only on the small-int (IS) path --
  large literal Integers (IP/IN) are no longer constant-folded, a minor
  regression for that case. T8832 covers the IS-path folding.
  
  The new golden-output test T21176 checks all three operations against the
  default implementations across the sign/size boundaries, recording each
  result plus its integerCheck validity. The base and ghc-bignum interface-
  stability export goldens gain the new functions.
  
  The main changelog entry lives in changelog.d under a new ghc-internal
  section (renamed from ghc-prim).
  
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/423
  
  Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
  

• 202ed264
  by Marc Scholten at 2026-06-25T05:52:21-04:00

  haddock: use Text in documentation pipeline
  
  This patch moves Haddock's documentation pipeline from String to Text
  where the data is already textual. It avoids repeated conversions while
  keeping the existing decoding behavior for invalid UTF-8 docstring
  chunks.
  
  The main changes are:
  
  * Render and carry docstrings as Text in Haddock-facing paths.
  * Use the Binary Text instance from GHC.Utils.Binary for Haddock
    interface files, and bump the Haddock binary interface version.
  * Add a FastString HTML instance so XHTML rendering avoids
    intermediate String allocation.
  * Keep HsDocStringChunk decoding lenient, matching the previous
    unpackHDSC behavior on invalid UTF-8 input.
  * Update the xhtml submodule to 3000.4.1.0, which contains the
    apostrophe escaping fix used by the Haddock test output.
  
  Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
  Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
  Assisted-by: Codex <codex@openai.com>
  

• a72ff58f
  by mangoiv at 2026-06-25T05:53:07-04:00

  compiler: rename ZonkAny to UnusedType and add pretty printing logic
  
  ZonkAny is a hard to understand name for users who do not know how the
  compiler works internally. Additionally, it is confusing that ZonkAny,
  while being a concrete type *represents* a meta variable, espeically in
  the compiler output.
  This patch changes the name of ZonkAny to UnusedType which is closer to
  its intended semantics and adds special pretty printing logic to display
  this type in the same fashion the compiler displays meta variables in
  other places, whenever they leak from the implementation to the user.
  It also exports the type from ghc-internal:GHC.Internal.Types in order
  to expose documentation.
  
  Fixes #27390
  
  Co-Authored-By: Sam Derbyshire <sam.derbyshire@gmail.com>
  

• 6813f002
  by Simon Jakobi at 2026-06-26T04:51:47-04:00

  Reg.Linear: drop Platform argument from most FR (FreeRegs) methods
  
  The FR class has one instance per CPU architecture, so any
  architecture-constant information its methods derived from the Platform
  argument can instead be baked into the instance. This removes the now
  needless Platform argument from frAllocateReg, frGetFreeRegs and
  frReleaseReg.
  
  frInitFreeRegs keeps its Platform argument: the initial allocatable set is
  genuinely platform-dependent, see Note [Aarch64 Register x18 at Darwin and
  Windows].
  
  Fixes #26665
  
  Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
  

• 3b2a9409
  by Zubin Duggal at 2026-06-26T04:52:39-04:00

  testsuite: Report fragile failures as skipped in JUnit output
  

• 27463426
  by Rodrigo Mesquita at 2026-06-26T20:54:58-04:00

  perf: Share Module in Iface Symbol Table
  
  This commit modifies the structure of the serialized `SymbolTable Name`
  to then re-use and share the `Module` (both on disk and in memory) across
  all `Name`s from the same module.
  
  The new structure looks like:
  
    <total name count>
    $modules.size
    for (mod, names) in $modules:
      $mod
      $names.size
      for table_ix, occ in $names
        $table_ix
        $occ
  
  i.e. we put the module just once, followed by all names in that module.
  When deserializing, we deserialize the module just once, and all the
  following `Name`s are constructed with a pointer to that same decoded
  `Module`.
  
  In `hoogle-test`, we must use `DNameEnv` rather than `Map Name`,
  otherwise the output fixities order was susceptible to changes in the
  uniques assigned to each Names, which is not stable.
  
  Fixes #27401
  
  -------------------------
  Metric Decrease:
      InstanceMatching
      LinkableUsage01
      LinkableUsage02
      hard_hole_fits
  -------------------------
  

• 412f1675
  by Simon Hengel at 2026-06-26T20:55:41-04:00

  Rename `MCDiagnostic` to `InternalMCDiagnostic`
  
  `MCDiagnostic` is meant to be used for compiler diagnostics.
  
  Any code that creates `MCDiagnostic` directly, without going through
  `GHC.Driver.Errors.printMessage`, sidesteps `-fdiagnostics-as-json` (see
  e.g. !14616, !14475, !14492 !14548).
  
  To avoid this in the future, this change more narrowly controls who
  creates `MCDiagnostic` (see #24113).
  

• 6f212121
  by Facundo Domínguez at 2026-06-26T20:56:27-04:00

  Encapsulate options of occurAnalysePgm in a record
  

• adfbb179
  by Facundo Domínguez at 2026-06-26T20:56:27-04:00

  Allow to configure the occurrence analyser to retain some dead bindings
  
  This is needed by plugins that are the only consumers of a binding which
  is otherwise unused in the program.
  
  See Note [Controlling elimination of dead bindings in occurrence analysis]
  added in this commit, or
  https://gitlab.haskell.org/ghc/ghc/-/issues/27240 for more discussion.
  

• c745b11f
  by Copilot at 2026-06-26T20:56:27-04:00

  Address documentation feedback
  

• 2c2a4a2a
  by Copilot at 2026-06-26T20:56:27-04:00

  Keep the imp_rules parameter of occurPgmAnalysePgm and add occ_opts to OccEnv
  

• e2262b0e
  by Copilot at 2026-06-26T20:56:27-04:00

  Strengthen T27240.hs with a binding that should be removed
  

• 5f9d9268
  by Copilot at 2026-06-26T20:56:27-04:00

  Move the reference #27240 to a related paragraph
  

• d86d2644
  by Simon Hengel at 2026-06-26T20:57:10-04:00

  Remove deprecated flag `-ddump-json` (see #24113)
  
  This was first deprecated in 9.10.1.
  

• 3b15ff03
  by Simon Jakobi at 2026-06-27T18:48:34+02:00

  Tweak mk_mod_usage_info
  
  * Use O(log n) `elemModuleEnv` instead of O(n) `elem` to filter the
    direct imports.
  * Use `nonDetModuleEnvKeys` to avoid sorting the ent_map keys twice.
  * Prepend the presumably shorter list when creating all_mods with
    `(++)`. Actually this eliminates the `(++)` entirely, as it seems to
    fuse with the `filter` expression.
  
  As a result there is a tiny speed-up when generating the .hi-files for
  modules with many imports.
  
  None of the changes affect compilation determinism as the module list
  is explicitly sorted to ensure a canonical order.
  

• 2d0fd154
  by Alan Zimmerman at 2026-06-29T11:44:00-04:00

  EPA: Remove LocatedC / SrcSpanAnnC
  
  This is part of a cleanup of the zoo of
  SrcSpanAnnXXX types for exact print annotations.
  
  This one removes SrcSpanAnnC used for storing exact print annotations
  for contexts. It replaces it with an explicit `HsContext` data type
  that carries the annotations and the context.
  
  So, replace
  
    type HsContext pass = [LHsType pass]
  
  with
  
    type HsContext pass = HsContextDetails pass (LHsType pass)
  
    data HsContextDetails pass arg
      = HsContext
        { hsc_ext  :: !(XHsContext pass)
        , hsc_ctxt :: [arg]
        }
      | XHsContextDetails !(XXHsContextDetails pass)
  
  We need the parameterised HsContextDetails because it is used both for
  HsQual carrying 'LHsExpr p' and "normal" contexts carrying 'LHsType p'.
  

• cca0d589
  by Luite Stegeman at 2026-06-30T13:33:40-04:00

  rts: handle large AP closures in compacting GC
  
  The function update_fwd_large in the compacting GC could run into
  an unexpected object with the following error:
  
    internal error: update_fwd_large: unknown/strange object  24
  
  Closure type 24 is the AP closure, which was not handled in
  upd_fwd_large. This patch adds handling them.
  
  fixes #27434
  

• 42935858
  by Luite Stegeman at 2026-06-30T13:33:40-04:00

  testsuite: use compacting_gc way instead of hardcoding +RTS -c
  

• bf7b5ce6
  by Alan Zimmerman at 2026-06-30T13:34:23-04:00

  EPA: Remove LocatedLW from LStmtLR
  
  HsDo already had its XDo extension point for an
  AnnList, which also appeared in LocatedLW.
  So we remove the redundant one and use the one inside HsDo
  as originally intended.
  
  Also delete LocatedLC/LocatedLS as they were unused
  

• d7cfea49
  by Recursion Ninja at 2026-06-30T21:37:12-04:00

  Decoupling 'L.H.S' from 'GHC.Types.SourceText'
  
    * Migrated 'IntegralLit'   to 'L.H.S.Lit'.
    * Migrated 'FractionalLit' to 'L.H.S.Lit'.
    * Migrated 'StringLiteral' to 'L.H.S.Lit'.
    * Added TTG extension points to the types above.
    * Added nice export list to 'GHC.Hs.Lit'.
    * Added 'rnOverLitVal' and 'tcOverLitVal' functions to 'GHC.Hs.Lit'.
    * Added instance 'Anno (StringLiteral (GhcPass p)) = SrcSpanAnnN'
    * Moved [Notes] about 'SourceText' from 'L.H.S.*' to 'GHC.*'.
    * Removed all references to 'SourceText' from 'L.H.S'.
    * Removed the trailing comma record field from  'StringLiteral'
    * Renamed exported functions for nomenclature consistency.
    * Deprecated the renamed functions
  
  Fixes #26953
  

• a1f2558b
  by Recursion Ninja at 2026-06-30T21:37:12-04:00

  Monomorphising GHC pass parameters where appropriate
  

• 7bf9e3c5
  by Teo Camarasu at 2026-06-30T21:38:03-04:00

  Make Q abstract
  
  This patch aims to clearly demarcate the internal and external interfaces
  of Q.
  In the past the `Quasi` typeclass was both part of the external,
  public-facing interface, and was used to give the implementation of `Q`.
  
  Now we separate out these two distinct roles. `Quasi` continues to exist
  in the public interface, but we introduce a new `MetaHandlers` type,
  which is equivalent to `Dict Quasi`.
  
  `Q a` is now defined to be `MetaHandlers -> IO a`, and, crucially,
  the constructor and the new `MetaHandlers` type are not exposed from the
  public interface.
  
  This gives us the ability to vary the interface on the GHC side without
  forcing a breaking change on the `template-haskell` side.
  Similarly `template-haskell` has more freedom to change the `Quasi`
  typeclass without needing any changes in `lib:ghc`.
  
  Implements https://github.com/ghc-proposals/ghc-proposals/pull/700
  
  Resolves #27341
  

• 4262af36
  by L0neGamer at 2026-06-30T21:38:56-04:00

  generically defines mconcat in terms of internal type's Semigroup instance
  
  add changelog entry
  
  use simpler definition for mconcat
  
  `nonEmpty` isn't available yet; inline branches in case
  
  add test case
  
  fixup generically defines mconcat in terms of internal type's Semigroup instance
  
  add comment on Generically and deriving mishaps
  
  swap mconcat to foldr version
  
  add some strictness testing for mconcat
  
  add to `base` changelog entry
  

• e22ad997
  by Cheng Shao at 2026-06-30T21:39:43-04:00

  hadrian/rts: fix unregisterised build for gcc 15+
  
  This patch fixes unregisterised build for gcc 15+:
  
  - Pass -optc-Wno-error in hadrian when +werror enables -optc-Werror,
    see added comment for details.
  - For RTS functions that the codegen would emit calls, ensure their
    real prototype is hidden when the header is included in .hc fies
    (IN_STG_CODE), and the dummy prototype is provided to match the EFF_
    convention.
  
  In the future we should get rid of EFF_ (#14647) and remove these
  hacks, but for now this patch makes unregisterised work again on newer
  toolchains. Fixes #27404.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 3f00f234
  by Cheng Shao at 2026-06-30T21:40:32-04:00

  compiler: fix missing handling of CmmUnsafeForeignCall node in LayoutStack
  
  This patch fixes missing handling of `CmmUnsafeForeignCall` middle
  node in the `LayoutStack` pass.
  
  Before proc-points splitting, this pass computes liveliness of local
  registers, and spills those alive across a Cmm native call onto the
  stack. It need to traverse all middle nodes in each block and check
  whether a local register is an assignee, if so then the previous
  mapping in `sm_regs` is invalidated and needs to be dropped. However,
  it didn't handle `CmmUnsafeForeignCall` node which may also assign to
  a local register. When proc-points splitting is enabled, this can
  produce an invalid basic block that doesn't properly backup the
  updated local register to the stack before doing a Cmm call, resulting
  in completely invalid runtime behavior.
  
  The patch also adds a `T27447` regression test. With no-TNTC or with
  LLVM backend, without the fix the test case would output a stale
  0x1111111111111111 value, instead of the expected 0x2222222222222222
  output.
  
  Fixes #27447.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 701088db
  by Ben Gamari at 2026-07-01T10:34:03-04:00

  gitlab-ci: Drop vestigial references to make build system
  

• 62d54a53
  by Ben Gamari at 2026-07-01T10:34:03-04:00

  gitlab-ci: Add support for running specifying a job's testsuite ways
  

• 7f97ac2c
  by Ben Gamari at 2026-07-01T10:34:03-04:00

  gitlab-ci: Run llvm testsuite ways in llvm jobs
  
  Addresses #25762.
  

• 7ea75116
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Add normalise_ddump_deriv setup function
  
  Some tests check the result of -ddump-deriv, which may contain INLINE pragmas depending on optimization flags.
  With normalise_ddump_deriv setup function, INLINE pragmas are stripped off.
  

• c7a8199f
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Use -dsuppress-idinfo to make tests more robust
  
  Previously, T18052a and T21755 were failing on 'optasm' and 'optllvm' ways because of visibility of unfoldings.
  

• a12122e5
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Use a trick to keep large objects alive
  
  Previously, T17574 and T19381 were failing on 'optasm' and 'optllvm' ways because of compiler optimizations.
  Change them to use NOINLINE to prevent unwanted optimizations.
  

• 1a95b327
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Only run T24224 in 'normal' way
  
  This test is a frontend-only one and breaks if optimizations are enabled.
  

• 8abea737
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Ignore T18118's stderr
  
  When optimizations are enabled, the compiler emits a warning (You cannot SPECIALISE ...).
  The message is not important, so ignore it.
  

• 9453a722
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Mark T816 and tc216 broken with optimizations
  
  These tests are about type checking, so we should not care too much if they are broken with optimizations.
  
  See #26952
  

• 0aef9ec0
  by Ben Gamari at 2026-07-01T10:34:03-04:00

  testsuite: ds014 is not longer broken
  
  It now appears to pass in the ways it was marked as broken in.
  
  Closes #14901.
  

• 4692d1e4
  by Ben Gamari at 2026-07-01T10:34:03-04:00

  testsuite: Only run stack cloning tests in the normal way
  
  These are too dependent upon code generation specifics to pass in most
  other ways.
  

• c154df26
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Update options_ghc_fbyte-code
  
  The `-fbyte-code` option used to be overriden by `-fllvm` but it is no longer true since !14872 was merged.
  
  I updated the test to accept the new behavior.
  
  Closes #27049
  

• 5d8bb7b5
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Only run T22744 in 'normal' way
  
  This test takes a long time on optimized ways.
  

• d1e74c8e
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Disable tests that use -finfo-table-map on llvm ways
  
  Currently, -finfo-table-map does not work with -fllvm. See #26435
  

• 3bf38c84
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Don't run T24726 on optimized ways
  
  If optimizations are enabled, the rewrite rule just fires and -drule-check will report nothing.
  

• e4eef116
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Use -fno-unoptimized-core-for-interpreter when running LinkableUsage01/02
  
  Optimizations for the bytecode interpreter are considered experimental, and need a flag to be enabled.
  

• 234a9872
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Suppress unwanted optimizations on T25284
  

• 99a2af2f
  by ARATA Mizuki at 2026-07-01T10:34:03-04:00

  testsuite: Don't run stack_big_ret with optimizations
  
  Stack layout may change with optimizations enabled.
  

• 04c836df
  by ARATA Mizuki at 2026-07-01T10:34:04-04:00

  testsuite: Mark memo001 broken on optimized ways
  
  See #27396
  

• 1a8a24f4
  by ARATA Mizuki at 2026-07-01T10:34:04-04:00

  testsuite: Mark syn-perf broken on optimized ways
  
  See #27398
  

• 40412093
  by Duncan Coutts at 2026-07-01T10:34:50-04:00

  Add a test for thread scheduler fairness
  
  It also tests that the interval timer and context switching works.
  We also test that fairness is lost when the context switching interval
  is too coarse for the duration of the test.
  
  We add this test before doing surgery on the interval timer, so we have
  decent coverage.
  

• 3f34d557
  by Duncan Coutts at 2026-07-01T10:34:50-04:00

  Make exported stop/startTimer no-ops, and rename internal functions
  
  Specifically, internally rename:
  stop/startTimer to pause/unpauseTimer
  stop/startTicker to pause/unpauseTicker
  
  and keep stop/startTimer as exported functions, but now as no-ops.
  
  In the past the stop/startTicker actions were used incorrectly as if
  they were synchronous, which they are not. See issue #27105. We now
  document pause/unpackTicker as being async and not to be used for the
  purpose of concurrency safety.
  
  The existing stop/startTimer (note Timer not Ticker, the Timer calls the
  Ticker!) are also exported from the RTS as a public API. This was
  historically because the ticker used signals and it was important to
  suspend the timer signel over a process fork. So these functions were
  exported to be used by the process and unix libraries.
  
  We cannot just remove the RTS exports, but we now make them no-ops, and
  they can be removed from the process and unix library later. This
  was already documented in a changelog.d entry no-more-timer-signal but
  due to changes during the MR process the change to make stop/startTicker
  into no-ops didn't make it into the earlier MR.
  

• 02e84e5f
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  Make exitTicker/exitTimer unconditionally synchronous
  
  We never use them asynchronously, and we should never need to do so.
  
  And update some related comments.
  

• 13db6a72
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  posix ticker: update and improve comments on (un)pause and exit
  
  Clarify what is async vs sync.
  

• 43d9a07d
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  posix ticker: split out ppoll/select helper functions
  
  Move the #ifdefs out of the main code body by introducing local helper
  functions and types, which themselves have two implementations (with a
  common API) based on ppoll or select.
  
  This helps improve clarity/readability.
  

• a5491baa
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  posix ticker: improve the implementation
  
  The existing implementation supported pausing and exiting, with the
  implementation of pausing reling on a mutex and condition variable.
  It needed to check the pause and stop shared variables on every
  iteration. It relies on ppoll or select, to wait on the timeout and also
  wait on an interrupt fd. The interrupt fd was only used for prompt
  exit/shutdown, and not for pausing or other notification. The pause only
  needed a lock and a memory operation, but the pause was not prompt. The
  resume used a lock, and signaling a cond var.
  
  The new implementation uses a somewhat more regular design: every
  notification is done by setting a shared variable and
  interrupting/notifying the ticker via the fd. The ticker thread does not
  need to check any shared variables on normal timer expiry, only when it
  recevies notification. This may be a micro-optimisation, but the tick
  occurs 100 times a second by default so any improvements in the hot path
  are amplified. When the ticker thread does receive notification it can
  check the various shared variables and update its local state. The
  blocking relies on using ppoll/select but without a timeout. This avoids
  the condition var and also allows further notifications when paused
  (also used for unpausing).
  
  This design can be extended with further notification types if needed by
  using and checking further shared vars (or making existing shared vars
  an enum or counter). This may be used in future for additional
  notifications to the ticker thread. This will likely be used to proxy
  wakeUpRts from a single handler context for example. And this approach,
  avoiding mutexes, is compatible with use from signal handlers.
  
  So overall, it's:
   * slightly simpler / more regular;
   * easier to extend with additional notifications;
   * probably slightly more efficient (but a micro-optimisation);
   * and supports calling notification from signal handlers
  

• 5b20821e
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  posix ticker: further minor local renaming for code clarity
  
  Improve the clarity with better choice of names for several local vars
  and function.
  

• 1f3ec5e0
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  win32 ticker: split out local helper functions
  

• 596e7307
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  win32 ticker: provide guarantee about concurrency and idempotency
  
  Use a lock to ensure pause/unpause can be used concurrently. Use a
  paused variable, protected by the lock, to ensure that pause and unpause
  are both idempotent. This is what the portable API expects.
  

• 1870edd7
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  win32 ticker: make the initial tick be after one wait interval
  
  There is no need to tick immediately. This is consistent with the
  posix implementation.
  

• 7c15ab5b
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  ticker: remove now-unnecessary layer of enable/disable
  
  There was an atomic variable used to block *part* of the actions of the
  tick handler. This still did not make stopTimer synchronous, even for
  the part of the the handle_tick actions it covered. It also added a more
  expensive (sequentuially consistent) atomic operation in the hot path
  for the handle_tick action, whereas our new design requires no atomic
  ops at all.
  
  Now that we have eliminate the need for synchronous stop/startTicker,
  we don't need this not-quite-working-anyway atomic protocol. The new
  pause/unpauseTicker is explicitly asynchronous and idempotent.
  

• 8585f8cb
  by Duncan Coutts at 2026-07-01T10:34:51-04:00

  ticker: add TODOs about issue #27250: too much being done from handle_tick
  
  The handle_tick should not perform I/O, block, perform long-running
  operations or call arbitrary user code. Unfortunately, everything to
  do with the eventlog (at the moment) falls into all those categories.
  

• 6e381626
  by Duncan Coutts at 2026-07-01T22:29:55+01:00

  Adjust releaseCapability_ precondition to allow cap->running_task == NULL
  
  There are two use cases for releaseCapability_:
  
  1. The current Task (cap->running_task) releases the Capability.
     The Capability is marked free, and if there is any work to do,
     an appropriate Task is woken up.
  
  2. There is no current task (cap->task == NULL), and thus the
     Capability is idle, and we want to wake up an idle Task to animate
     the Capability. This case uses always_wakeup.
  
  Currently, the precondition for releaseCapability_ is
    cap->running_task != NULL
  and so the 2nd use cases have to set cap->running_task (which is then
  immediately overwritten) just to satisfy the precondition. See the
  use cases in sendMessage and prodCapability.
  
  So we can relax the precondition to be:
    cap->running_task != NULL || always_wakeup
  so that in the always_wakeup case, we say it is ok for the
  cap->running_task to be NULL.
  
  This lets us simplify sendMessage and prodCapability. In particular it
  will allow prodCapability to not need a Task parameter.
  
  The ulterior motive for all this is that I want to be able to call
  prodCapability from an OS thread that is not itself a Task, in persuit
  of issue #27086: disentangle I/O managers from wakeUpRts. The most
  straightforward way to wake the RTS is using prodCapability, but the
  context in which we will need to do that are threads that are not Tasks.
  

• 89404ebc
  by Duncan Coutts at 2026-07-01T22:29:55+01:00

  prodCapability no longer needs to take a Task param
  
  Now that releaseCapability_ can accept cap->running_task == NULL then it
  is no longer necessary for prodCapability to require a Task.
  

• 4e60c5f6
  by Duncan Coutts at 2026-07-01T22:29:56+01:00

  Define prodOneCapability
  
  There was an existing declaration for this in the header file, but no
  definition.
  
  Similarly, there is a declaration for prodAllCapabilities but no
  definition, and we don't need it, so remove the declaration.
  

• 2527026f
  by Duncan Coutts at 2026-07-01T22:29:56+01:00

  Add a wakeUpRtsViaTicker feature to the posix ticker
  
  It proxies a call to wakeUpRts, but crucially, this can be called from
  a signal handler context. It will be used for ctl-c handling.
  

• aa5a03a5
  by Duncan Coutts at 2026-07-01T22:29:56+01:00

  Change how wakeUpRts works
  
  Previously it would call wakeupIOManager to get a capability to wake up
  and run. This works but it entangles the I/O managers with unrelated
  features: ctl-c handling and idle gc (the two features that use wakeUpRts).
  
  The reason it used wakeupIOManager is that this action is safe to use
  from a posix signal handler, since it just posts bytes to a pipe.
  Otherwise the more direct approach (used e.g. by sendMessage when the
  target capability is idle) is to use releaseCapability. But that uses
  condition variables and mutexes, which are not safe to use from within a
  signal handler.
  
  So instead of entangling the (multiple) I/O managers with this, we make
  wakeUpRts use the direct approach (using prodOneCapability). On win32
  the ctl-c console handler can call wakeUpRts directly, since it is
  called in a proper thread. On posix, to deal with the signal handler
  problem, we make the signal handler ask the ticker thread to proxy the
  call to wakeUpRts, since the ticker thread is also a proper thread.
  
  This will allow the I/O managers to no longer be concerned with this.
  This is good because there are many I/O managers (and they're
  complicated), but there is (on posix) only one ticker implementation. So
  this is an overall reduction in coupling and complexity.
  
  Fixes issue #27086
  

• c6d53c16
  by sheaf at 2026-07-02T21:35:44-04:00

  Test driver: normalise line numbers into libraries
  
  When comparing the stdout of tests that print out callstacks, we can't
  rely on the stability of exact line:column spans pointing into libraries
  (e.g. ghc-internal), as any change (such as adding a comment) can change
  them.
  
  This commit addresses this by normalising away line:column in callstacks,
  but only when those point into internal libraries. We don't do this in
  general, as the exact span might be important to the test (e.g. for a
  span within the test module itself).
  
  Fixes #27387
  

• 81ee62e0
  by Alan Zimmerman at 2026-07-02T21:36:33-04:00

  EPA: Remove LocatedLW from MatchGroup
  
  This is the last usage of LocatedLW / SrcSpanAnnLW
  

• 925959db
  by Recursion Ninja at 2026-07-04T04:14:12-04:00

  Decoupling 'L.H.S' from 'GHC.Hs.Doc'
  
    * Migrated 'GHC.Hs.Doc' and 'GHC.Hs.DocString' AST defintions from 'GHC.*' namespace,
      to new 'Language.Haskell.Syntax.Doc' module in the 'L.H.S' "namespace."
    * Updated 'HsDocString to be TTG-parameterised as 'HsDocString pass'.
    * Added 'GHC.Hs.Extension.Pass': splits 'GhcPass'/'Pass' and all 'HsDocString'
      TTG instances out of 'GHC.Hs.Extension', which re-exports it unchanged
      (this is backwards compatible and prevents the introduction of a boot file).
    * Deleted 'GHC.Hs.Doc.hs-boot'; removed all 'L.H.S.*' imports of 'GHC.Hs.Doc'.
    * Updated 'GHC.Hs.DocString' to be TTG pass-parameterised throughout; moved
      'mkHsDocStringChunk'/'unpackHDSC' here (require 'GHC.Utils.Encoding').
    * Split 'GHC.Rename.Doc.rnHsDoc' from 'rnHsDocIdentifiersOnly'.
    * Updated parser, renamer, typechecker, HIE, and exact-print for new types.
    * Added 'HsDocString' TTG instances for 'DocNameI' to 'Haddock.Types'.
    * Killed the last module loop between GHC.* and LHS.*.
          - Only edges from LHS.* to GHC.Data.FastString now!
  
  Resolves #26971
  

• b7e24044
  by mangoiv at 2026-07-04T04:14:56-04:00

  ci: retry fetching test metrics
  
  Retry fetching test metrics to make the CI not fail if the services is
  temporarily unavailable
  

• 4180af3f
  by Zubin Duggal at 2026-07-04T04:15:38-04:00

  Bump semaphore-compat submodule to 2.0.1
  
  This versions includes some cruicial fixes for darwin
  

• 242d4317
  by sheaf at 2026-07-04T04:16:19-04:00

  Remove outdated comment in GHC.Data.ShortText
  
  There was a long comment in GHC.Data.ShortText about a workaround that
  was necessary when bootstrapping with GHC 9.2 and below. The actual
  logic has since been dropped, but the comment remained. This commit
  removes the vestigial comment.
  

• 9b714c4c
  by Zubin Duggal at 2026-07-05T09:40:36+05:30

  CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent
  
  In #25924, we segfault because speculation forces a projection out of a RUBBISH dictionary
  (which we generated because it absent).
  
  Solution: Don't speculate on bindings we already know are absent.
  
  Fixes 25924
  

• 4a59b3ee
  by Zubin Duggal at 2026-07-05T09:40:36+05:30

  Don't make absent fillers for terminating types
  
  In #25924 we discovered that we could speculatively evaluate an absent filler
  for a dictionary, and project a field (a superclass selector) out of it,
  resulting in segfaults.
  
  Solution: Never make an absent filler or rubbish literal for a terminating type
  like a dictionary. mkAbsentFiller returns Nothing for isTerminatingType, so
  worker/wrapper and the specialiser keep the real argument instead.
  
  Some small metric decreases because we do a little less work in the
  simplifier now.
  
  Metric Decrease:
      T9872a
      T9872b
      T9872c
      TcPlugin_RewritePerf
  

• 383ddcd4
  by Alan Zimmerman at 2026-07-06T07:08:16-04:00

  EPA: Move the 'where' annotation for PatSynBind
  
  This allows us to move it out of the MatchGroup exact print annotation
  too
  

• 66d1a5d5
  by fendor at 2026-07-07T16:57:56-04:00

  Add 'backendInfoTableMapValidity' backend predicate
  
  Check whether the backend supports the `-finfo-table-map` flag and
  ignore it otherwise.
  
  Improve by-design documentation of `backendCodeOutput`.
  
  `Backend` is **abstract by design**. Make this clearer in
  `backendCodeOutput` which is incorrectly being used as a proxy for
  `Backend`.
  
  Instead, define the desired property predicates in GHC.Driver.Backend
  In the process, make `backendCodeOutput` total.
  

• 74f1071d
  by fendor at 2026-07-07T16:57:56-04:00

  Add failing test for `-finfo-table-map` and bytecode backend
  
  If you compile a module using the bytecode backend, with
  -finfo-table-map, then the info table map doesn't get populated for the
  module.
  
  This is because the -finfo-table-map code path is implemented mostly in
  the StgToCmm phase which isn't run when creating bytecode.
  
  Ticket #27039
  

• 28d63bca
  by mangoiv at 2026-07-07T16:59:16-04:00

  ci: don't fail nightly if there have been no changes that night
  
  Fixes #27127
  

• 4ebfc478
  by Rodrigo Mesquita at 2026-07-08T04:47:53-04:00

  ttg: Using ShortText over FastString in the AST
  
  To make the AST independent of GHC, this commit replaces usages of
  `FastString` with `HText` in the AST, killing the last edge from
  Language.Haskell.* to GHC.* modules.
  
  Even though we /do/ want to use FastStrings in general -- critically in
  Names or Ids -- there is no particular reason for the FastStrings that
  occur in the AST proper to be FastStrings. Strings in the AST are
  typically unique and don't benefit particularly from being interned
  FastStrings with Uniques for fast comparison.
  
  `HText` is a type synonym for `ShortText` which uses GHC's Modified
  UTF-8 encoding exclusively.
  
  Modified UTF-8 must be used to represent the Haskell AST because the
  Haskell Report allows surrogate code points. `Data.Text.Text` functions
  use Standard UTF-8 which replace surrogates with a placeholder value,
  thus `Data.Text.Text` is unsuitable for AST strings. See the
  `Language.Haskell.Syntax.Text` module header for more details.
  
  Final progress towards #21592
  
  Closes #21628
  

• d910b353
  by Simon Peyton Jones at 2026-07-08T04:48:36-04:00

  Update equality-type documenation in GHC.Builtin.Types.Prim
  
  Fix #27466
  

• b2530542
  by Simon Peyton Jones at 2026-07-08T04:48:36-04:00

  Honour -dsuppress-coercions in GHC.Core.TyCo.pprCo
  
  Fixes #27467
  

• 9a73179a
  by Facundo Domínguez at 2026-07-08T04:49:26-04:00

  Add item to MR checklist asking to squash fixup commits after approval
  
  The checklist has an item that reads
  
      All commits are either individually buildable or squashed.
  
  This item could be checked immediately after sending the merge request
  though. If reviewers ask for amends later on, and the author amends
  the merge request, there was no item that would remind the contributors
  to squash the fixup commits before landing.
  
  This commit adds a new item
  
      After all approvals and before landing: all fixup commits are squashed with their originating commits.
  
  which should be harder to mark as done before approvals have been given.
  

• ed09895d
  by Andreas Klebinger at 2026-07-08T16:53:27-04:00

  Fix a profiling race condition resulting in segfaults.
  
  StgToCmm: Don't assume tagged FUN closures in closureCodeBody.
  When entering a closure the self/node pointer might not be tagged in
  some situations when a thunk is evaluated by multiple threads.
  So we most AND away the tag bits rather than subtracting an expected tag.
  
  Apply.cmm: Fix a race condition occuring when a thunk is mutated during GC.
  
  In stg_ap_0_fast when might need to run GC before entering a thunk. If this happens
  another thread or the GC itself might mutate the closure making entering it no longer
  valid. We now check for this.
  
  Add test and changelog for #27123 fixes.
  

• 67c03eb2
  by Cheng Shao at 2026-07-08T16:54:09-04:00

  ghc-heap: fix invalid srtlen returned by peekItbl when no-TNTC
  
  This patch fixes the no-TNTC code path of `peekItbl` so that it looks
  at the right memory address when reading the `srt` field from the
  `StgInfoTable_` struct. Also adds a `T27465` regression test that
  reproduces the bug on no-TNTC builds before the fix. Fixes #27465.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 2ecabb4f
  by Zubin Duggal at 2026-07-09T09:23:25-04:00

  hadrian: binary-dist-dir should not be the default target
  
  Revert behaviour to pre 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
  
  In 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2, we applied the following behaviour change:
  
  ```
  hadrian: Build stage 2 cross compilers
  ...
  * hadrian: Make binary-dist-dir the default build target. This allows us
    to have the logic in one place about which libraries/stages to build
    with cross compilers. Fixes #24192
  ```
  
  This is a major regression to development experience, a plain hadrian/build
  --freeze1 now takes ages because we rebuild all docs (which need to go in the
  binary dist dir).
  
  `binary-dist-dir` is the wrong default target for regular GHC development work
  
  Fixes #27445
  

• e16388e3
  by Zubin Duggal at 2026-07-09T09:23:25-04:00

  .gitignore: Add the hadrian system.config introduced by commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
  
  Since
  
  commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
  Author: Matthew Pickering <matthewtpickering@gmail.com>
  Date:   Thu Dec 21 16:17:41 2023 +0000
  
      hadrian: Build stage 2 cross compilers
  
  ./configure produces /hadrian/cfg/system.config.{host,target}
  
  Add these to .gitignore
  

• 7e8abf41
  by Alan Zimmerman at 2026-07-09T09:24:12-04:00

  EPA: Replace AnnListItem with simply [TrailingAnn]
  
  Remove the unnecessary wrapper around a single field.
  

• 29032f17
  by Zubin Duggal at 2026-07-09T09:24:58-04:00

  testsuite: Keep real reason for fragile test failures
  

• c34e03a7
  by Zubin Duggal at 2026-07-09T09:24:58-04:00

  testsuite: Fall back to the failure reason for empty JUnit bodies
  

• 409d40f0
  by Zubin Duggal at 2026-07-09T09:24:58-04:00

  testsuite: Show output diffs in JUnit output
  
  Also refactor compare_outputs to return essentially a `Maybe Diff`
  (`CompareOutput`) instead of a bool, but more pythonic. This
  allows us to pass the diff through nice.
  

• 06fee1ab
  by Zubin Duggal at 2026-07-09T09:24:58-04:00

  perf notes: include stat deviation and acceptance window in notes so they show up in gitlab
  

• 57c0f32c
  by mangoiv at 2026-07-10T11:08:38-04:00

  driver: enable -finter-module-far-jumps by default
  
  this fixes a compatibility bug with certain binutils/gcc versions where
  we were seeing jump offset overflow errors.
  This commit can probably reverted if we stop supporting the problematic
  binutils/gcc verions (2.44 and 14.2, respectively)
  
  Reolves #26994
  

• 4396a6f2
  by Andrea Vezzosi at 2026-07-10T11:09:25-04:00

  [Fix #27287] preserve ModBreaks in ModIface
  

• ed261a7e
  by Cheng Shao at 2026-07-14T17:59:38-04:00

  hadrian: fix HLS support
  
  This patch fixes hadrian's HLS support so one can rely on HLS when
  working on the hadrian codebase. Fixes #27480.
  
  Not building/linking shared libraries for hadrian is a severely
  premature optimization; this top-level setting in `cabal.project` only
  affects home packages while the dependencies in the cabal store are
  built with vanilla/dynamic anyway, and even adding dynamic builds to
  home packages would not be costly due to cabal's usage of
  `-dynamic-too`.
  

• eee8ec5b
  by Cheng Shao at 2026-07-14T18:00:20-04:00

  compiler: fix miscompiled %load_relaxed, add missing %store_relaxed
  
  This patch fixes the %load_relaxed cmm primop compilation logic to
  correctly use relaxed memory ordering, and adds the missing
  %store_relaxed primop. Parsing logic of %load/%store with explicit
  ordering is covered in the AtomicFetch test case. Fixes #27483.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 1718230f
  by Alan Zimmerman at 2026-07-14T18:01:06-04:00

  EPA: Keep binds and sigs together in HsValBindsLR
  
  We combine them into a single list for GhcPs, wrapped in the
  ValBind data type, which is the bind equivalent of ValD, having
  constructors for binds and sigs.
  
  This simplifies exact print processing, especially when using it to
  update the contents of local binds, as we no longer need AnnSortKey
  BindTag
  

• 6bd1ad2a
  by Andreas Klebinger at 2026-07-14T18:01:49-04:00

  Bump nofib submodule to account for MonoLocalBinds.
  
  New versions of GHC enable MonoLocalBinds by default.
  This breaks some of the benchmarks. I've fixed this and
  this bump pulls in that fix.
  

• 7eb0f1c9
  by Cheng Shao at 2026-07-14T18:02:31-04:00

  testsuite: fix bytecodeIPE test under +ipe flavours
  
  This patch fixes the bytecodeIPE test under +ipe flavours. It used to
  fail under +ipe because the RTS is built with IPE info, then
  stg_AP_info in RTS carries IPE info, so whereFrom wouldn't return
  Nothing. Now the test checks IPE info of a datacon in the ghci-loaded
  module which is not affected by whether the RTS is built with IPE info
  or not. Fixes #27498.
  
  Co-authored-by: Codex <codex@openai.com>
  

• ef038aae
  by cydparser at 2026-07-15T04:35:41-04:00

  Reduce bytes allocated for `capabilities` in RTS (fixes #27487)
  
  In rts/Capability.c, `capabilities` is an array of pointers, but it was allocated as if it were an
  array of Capability's.
  

• d377e83e
  by Cheng Shao at 2026-07-15T04:36:27-04:00

  rts: fix missing UNTAG in stg_readTVarIOzh
  
  This patch fixes missing UNTAG on the current value closure read from
  StgTVar. UNTAG is a no-op when it's stg_TREC_HEADER_info which is word
  aligned; it may be a tagged closure, and reading info table from the
  tagged address is an unaligned load which may cause issues on
  platforms with strict alignment requirements.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 8ed03842
  by Cheng Shao at 2026-07-15T04:36:27-04:00

  rts: fix missing UNTAG in stg_control0zh_ll
  
  This patch fixes missing UNTAG on the cont closure returned by
  captureContinuationAndAbort. In case it's not NULL,
  captureContinuationAndAbort returns a tagged StgContinuation closure,
  in which case it must be untagged before accessing the
  apply_mask_frame field.
  
  In the past it worked out of luck: when apply_mask_frame was NULL then
  mask_frame_offset is also 0 so the control flow didn't diverge to a
  wrong path. Still, this is horribly wrong and will crash once
  StgContinuation struct is refactored and fields are shuffled around.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 5aa7000a
  by Cheng Shao at 2026-07-15T04:37:08-04:00

  compiler: fix redundant AP thunk codegen when not using -ticky-ap-thunk
  
  This patch fixes a double negation confusion in !7525 that results in
  some redundant AP thunk code generation when not using
  -ticky-ap-thunk. Now, we use `stgToCmmUseStdApThunk` to indicate
  whether precomputed AP thunks in the RTS should be used, which
  defaults to `True`, unless `-ticky-ap-thunk` is passed.
  `-finfo-table-map` now also implies `-ticky-ap-thunk`, since when
  doing IPE profiling we want the generated AP thunks to be unique.
  Fixes #27502.
  
  -------------------------
  Metric Decrease:
      T3064
  -------------------------
  
  Co-authored-by: Codex <codex@openai.com>
  

• d43a7b7a
  by Brian McKenna at 2026-07-15T20:10:04+02:00

  Strip ticks when desugaring bool guards
  
  The special `considerAccessible` pattern was broken when compiling
  with debug info. Compiling with debug info wraps expressions with
  `SourceNote` ticks, which broke the internals of the
  `desugarBoolGuard` function. Ticks are now ignored within this
  function.
  
  Fixes #27360
  

• ede4b17b
  by Ben Gamari at 2026-07-15T22:59:53-04:00

  base: Display ExceptionContext in WhileHandling's textual description
  
  As originally-implemented the implementation for
  `WhileHandling(displayExceptionAnnotation)` would display the
  `ExceptionContext` of the exception which it carries (as this was the
  behavior of `displayException`, in terms of which
  `displayExceptionAnnotation` was implemented).
  
  However, in 284ffab3 the definition of `SomeException(displayException)`
  was changed to exclude the `ExceptionContext`. This means that
  `WhileHandling(displayExceptionAnnotation)` fails to describe the
  provenance of the exception which it captures, greatly limiting its
  utility.
  
  Return the implementation to its originally-specified behavior by
  implementing `WhileHandling(displayExceptionAnnotation)` in terms of
  `displayExceptionWithInfo`.
  
  Fixes #27456.
  

• 0f64f348
  by Cheng Shao at 2026-07-16T15:41:08+00:00

  ci: add missing docker permission workaround in abi-test job
  

• 660cb239
  by Cheng Shao at 2026-07-16T19:37:48+00:00

  bindist: Fix make install -j race condition on macos/freebsd
  
  This patch fixes make install -j race condition on macos/freebsd. BSD
  install fails with EEXIST when multiple install processes concurrently
  create the same prefix directory. So we add an `install_dirs`
  prerequisite job that sequentially creates the directories for
  subsequent jobs to work with. Fixes #27499.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 08130257
  by Cheng Shao at 2026-07-16T19:37:48+00:00

  ci: run bindist make install with -j
  
  This patch makes the ci scripts run `make install` with `-j` to reduce
  wall clock time when installing the bindist, see related issue for
  benchmark numbers. This only affects ghc ci logic, the user-facing
  default is up to distributors and is still `-j1`. Closes #27029.
  

• d5ae6906
  by Adam Gundry at 2026-07-17T04:57:43-04:00

  Mark various language extension flags as deprecated (see #27329)
  
  The following language extensions are now deprecated:
  
   - AlternativeLayoutRule
   - AlternativeLayoutRuleTransitional
   - ParallelArrays
   - PolymorphicComponents
   - Rank2Types
  
  In addition, the warning `-Walternative-layout-rule-transitional`
  has been marked as deprecated, as it is emitted only under the
  deprecated extension `XAlternativeLayoutRuleTransitional`.
  

• fe3b059c
  by Andrew Lelechenko at 2026-07-17T04:58:26-04:00

  base: re-export GHC.Environment.getFullArgs from System.Environment
  
  CLC proposal https://github.com/haskell/core-libraries-committee/issues/431
  

• 722236dd
  by sheaf at 2026-07-18T08:48:31-04:00

  Coercion optimisation: avoid double-Sym for InstCo
  
  Ticket #27374 pointed out an issue with GHC.Core.Coercion.Opt.optCoercion's
  handling of InstCo: it contravened (LC2) in Note [The LiftingContext in optCoercion]
  because it applied the ambient 'sym' to a coercion that was then added
  to the lifting context substitution.
  
  Fixes #27374
  
  Co-authored-by: Simon Jakobi <simon.jakobi@gmail.com>
  

• ff70fc75
  by sheaf at 2026-07-18T08:48:31-04:00

  Coercion optimisation: avoid exponential behaviour
  
  The change to coercion optimisation of 'InstCo' in the previous commit
  introduces exponential behaviour to the coercion optimiser. To avoid
  this, this commit provides a way to push in 'Sym' of an already-optimised
  coercion: GHC.Core.Coercion.Opt.mkDeepSymCo.
  
  See Note [Pushing Sym without re-optimising] in GHC.Core.Coercion.Opt.
  

• dfef27f0
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Move THREADED_RTS-conditional struct members to end of Capability
  
  Accessing members of the Capability struct from CMM code rely on
  accessor macros. (The macros are generated by deriveConstants).
  
  These macros have a single definition. This means that the offsets of
  all struct members must *not* vary based on THREADED_RTS vs
  !THREADED_RTS. This requires that any struct members that are
  conditional on THREADED_RTS must occur after the unconditional struct
  members. Hence we move all the ones that are conditional on
  THREADED_RTS to the end.
  
  Add a deriveConstants entry for the iomgr member of the Capability
  struct, which was the motivation for this change.
  
  Add warning messages to help our future selves. Debugging this took me
  a couple hours in gdb!
  

• c254e022
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Make the IOManager API use CapIOManager rather than Capability
  
  This makes the API somewhat more self-contained and more consistent.
  Now the IOManager API and each of the backends takes just the I/O
  manager structure. Previously we had a bit of a mixture, depending on
  whether the function needed access to the Capability or just the
  CapIOManager.
  
  We still need access to the cap, so we introduce a back reference to
  reach the capability, via iomgr->cap.
  
  Convert all uses in select and poll backends, but not win32 ones.
  Convert callers in the scheduler and elsewhere.
  
  Also convert the three CMM primops that call IOManager APIs. They just
  need to use Capability_iomgr(MyCapability()).
  

• 4f3d8f31
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Split posix/MIO.c out of posix/Signals.c
  
  The MIO I/O manager was secretly living inside the Signals file.
  
  Now it gets its own file, like any other self-respecting I/O manager.
  

• 52ce04a9
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Rationalise some scheduler run queue utilities
  
  Move them all to the same place in the file.
  
  Make some static that were used only internally.
  
  Also remove a redundant assignment after calling truncateRunQueue that
  is already done within truncateRunQueue.
  

• 75bbdebc
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Rename initIOManager{AfterFork} to {re}startIOManager
  
  These are more accurate names, since these actions happen after
  initialisation and are really about starting (or restarting) background
  threads.
  

• 724c0517
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Free per-cap I/O managers during shutdown and forkProcess
  
  Historically this was not strictly necessary. The select and win32
  legacy I/O managers did not maintain any dynamically allocated
  resources. The new poll one does (an auxillary table), and so this
  should be freed.
  
  After forkProcess, all threads get deleted. This includes threads
  waiting on I/O or timers. So as of this patch, resetting the I/O
  manager is just about tidying things up. For example, for the poll
  I/O manager this will reset the size of the AIOP table (which
  otherwise grows but never shrinks).
  
  In future however the re-initialising will become neeecessary for
  functionality, since some I/O managers will need to re-initialise
  wakeup fds that are set CLOEXEC.
  

• c007d122
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Add a TODO to the MIO I/O manager
  
  The direction of travel is to make I/O managers per-capability and have
  all their state live in the struct CapIOManager. The MIO I/O manager
  however still has a number of global variables.
  
  It's not obvious how handle these globals however.
  

• b65ab7b3
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Add a FIXME note in the Poll I/O manager
  

• daf2bd6f
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Add missing updateRemembSetPushClosure in poll I/O manager
  
  For the non-moving GC.
  

• e33ca830
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Minor doc improvement to struct StgAsyncIOOp member outcome
  
  Mention the enumeration names, as well as their numeric values. The rest
  of the code uses the enum names.
  

• 4edd2579
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Minor doc improvements for StgTSOBlockInfo
  
  Clarify that certain union members are used only by certain legacy
  I/O managers. Hopefully we will be able to remove these at some point.
  

• 536bedbb
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Avoid exporting various win32-specific rts symbols
  
  The BeginPrivate.h / EndPrivate.h scheme works perfectly well on
  Windows, but all of the rts/win32/*.h files were not using it.
  

• 8139b5ac
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Remove wakeupIOManager, ioManagerWakeup and setIOManagerWakeupFd
  
  We no longer need wakeupIOManager for the threaded RTS case, so we can
  remove it and the bits only needed to support it. This includes the
  pipe/eventfd fd shared between the RTS and the in-library I/O manager
  used for waking up the I/O manager thread. The pipe/eventfd still
  exists, but it no longer has to be communicated to the RTS, since the
  RTS no longer needs to use it.
  
  So we remove the RTS API export setIOManagerWakeupFd, and remove uses of
  it within the I/O managers in ghc-internal.
  

• 74fe7c66
  by Duncan Coutts at 2026-07-18T08:49:12-04:00

  Add a new interruptIOManager API for the I/O managers
  
  It will be used to interrupt awaitCompletedTimeoutsOrIO. Also update the
  return type and docs for awaitCompletedTimeoutsOrIO to have it return
  false when it gets interrupted, and have no useful post condition in
  that case.
  

• 38792843
  by Duncan Coutts at 2026-07-18T08:49:13-04:00

  Add interruptIOManager support for select I/O manager
  
  Uses the FdWakup mechanism.
  

• 2f3b00aa
  by Duncan Coutts at 2026-07-18T08:49:13-04:00

  Add interruptIOManager support for poll I/O manager
  
  Uses the FdWakup mechanism.
  
  A quirk we have to cope with is that we now need to poll one more fd --
  the wakeup_fd_r -- but this fd has no corresponding entry in the
  aiop_table. This is awkward since we have set up our aiop_poll_table to
  be an auxilliary table with matching indicies.
  
  The solution this patch uses (and described in the comments) is to have
  two tables: struct pollfd *aiop_poll_table, *full_poll_table;
  and to have the aiop_poll_table alias the tail of the full_poll_table.
  The head entry in the full_poll_table is the extra fd. So we poll the
  full_poll_table, while the aiop_poll_table still has matching indicies
  with the aiop_table.
  
  Hurrah for C aliasing rules.
  

• cee50131
  by Duncan Coutts at 2026-07-18T08:49:13-04:00

  Add interruptIOManager support for win32 legacy I/O manager
  
  And remove unused related helper resetAbandonRequestWait. It is not
  called because the event is created in auto-reset mode, so never needs
  to be reset manually.
  

• cf453143
  by Duncan Coutts at 2026-07-18T08:49:13-04:00

  Note lack of interruptIOManager support for WinIO I/O manager
  
  Though there's a plausible design, we can't sanely test it at the moment
  due to related WinIO bugs. Filed as issue #27403.
  

• 1b74a0ad
  by Duncan Coutts at 2026-07-18T08:49:13-04:00

  Be more explicit about enum IOReadOrWrite values, and type within cmm
  
  Belt and braces.
  

• b388d093
  by Brian McKenna at 2026-07-18T17:51:50-04:00

  Ignore ticks in the pattern-match term oracle
  
  The term-oracle in the pattern-match checker is keyed by a canonical
  form of the scrutinee, computed by `makeDictsCoherent`. That canonical
  form was tick-sensitive: two occurrences of an otherwise identical
  expression that happened to carry different ticks were treated as
  distinct values, breaking long-distance information.
  
  This shows up in practice under `-finfo-table-map`, because the
  desugarer wraps every record-selector use site in a `SourceNote`
  carrying that site's span. For example:
  
       data Box = Box { unBox :: Maybe Int }
       f b = case unBox b of
         Nothing -> 0
         Just _  -> let Just x = unBox b in x
  
  The two `unBox b` expressionss carry different SourceNote spans, the
  pattern-match checker sees them as different, the long-distance
  information from the outer `Just _` branch never reaches the
  let-pattern, and `Just x = unBox b` is wrongly reported as
  non-exhaustive.
  
  We now strip all ticks in `makeDictsCoherent`.  This is documented as
  Wrinkle (UD1) of Note [Unique dictionaries in the TmOracle CoreMap].
  
  Fixes #27314
  

• c23e1acb
  by Mrjtjmn at 2026-07-18T17:52:45-04:00

  Add explanations for unsolved Typeable constraints
  
  This commit adds explanations for unsolved 'Typeable' constraints.
  
  GHC will now provide additional explanations for an unsolved constraint
  of the form 'Typeable ty', explain why GHC did not solve Typeable constraint.
  e.g.:
   - 'ty' is a polymorphic type (e.g. forall a. a -> a)
   - 'ty' is a qualified type (e.g. Eq Int => Int)
   - 'ty' is an unboxed sum type
   - 'ty' is an unreduced type family application
   - 'ty' whose kind is not typeable
  
  Fixes #26532
  

• cbef021e
  by Artem Pelenitsyn at 2026-07-19T07:49:55-04:00

  ghc-internal: Lock.hs: fix typo and indentation

• 42918646
  by Duncan Coutts at 2026-07-19T07:50:36-04:00

  Fix failing test GcStaticPointers for non-moving GC
  
  Minor mistake in asserting something before checking for that same
  thing.
  
  Specifically, Bdescr asserts HEAP_ALLOCED_GC, but Bdescr was being used
  prior to a guard that checks HEAP_ALLOCED_GC. The solution is just to
  move the use of Bdescr after the guard.
  
  Thanks to Simon Jakobi for identifying the problem.
  

• c2f6dcd4
  by Sasha Bogicevic at 2026-07-20T10:31:56+02:00

  Improve error messages for invalid record wildcards
  
  Record wildcard hints are now shown in more contexts and include
  constructor arity; matching with `..` on a fieldless constructor
  now produces a dedicated error message.
  
  Fixes #21101
  

• 4c02e76b
  by Duncan Coutts at 2026-07-21T10:37:21-04:00

  Mark test T27105 as fragile, citing issue #27522
  
  Scheduler fairness is fine, except when it isn't. And it isn't on CI
  machines surprisingly often! See the issue for details.
  

• 43dd2b15
  by Recursion Ninja at 2026-07-21T17:09:53-04:00

  Resolving many TTG related orphan type-class instances
  
  This is part a technical debt removal effort made possible now
  that separating out the AST via TTG has come to a close.
  
  As the AST in 'L.H.S' has been incrementally separated from the GHC internals,
  there are many accumulated orphan instance of 'Binary', 'NFData', 'Outputable',
  and 'Uniquable'. The orphan instance of data-types from within 'L.H.S' have had
  their orphan instances moved to either:
    1. The module which defines the data-type
    2. The module which defines the type-class;
       i.e. moving an orphan 'Binary' instance to 'GHC.Utils.Binary'
  
  Orphan instances resolved (37):
  
    | Data-type            | Resolved instance(s)       | Former orphan module(s)   |
    | -------------------- | -------------------------- | ------------------------- |
    | Role                 | Binary, NFData, Outputable | GHC.Core.Coercion.Axiom   |
    | SrcStrictness        | Binary, NFData, Outputable | GHC.Core.DataCon          |
    | SrcUnpackedness      | Binary, NFData, Outputable | GHC.Core.DataCon          |
    | Fixity               | Binary, Outputable         | GHC.Hs.Basic              |
    | FixityDirection      | Binary, Outputable         | GHC.Hs.Basic              |
    | LexicalFixity        | Outputable                 | GHC.Hs.Basic              |
    | CCallTarget          | NFData                     | GHC.Hs.Decls.Foreign      |
    | CType                | NFData                     | GHC.Hs.Decls.Foreign      |
    | Header               | NFData                     | GHC.Hs.Decls.Foreign      |
    | OverlapMode          | Binary, NFData             | GHC.Hs.Decls.Overlap      |
    | WithHsDocIdentifiers | NFData, Outputable         | GHC.Hs.Doc                |
    | HsDocString          | NFData                     | GHC.Hs.DocString          |
    | HsDocStringChunk     | Binary, Outputable         | GHC.Hs.DocString          |
    | HsDocStringDecorator | Binary, Outputable         | GHC.Hs.DocString          |
    | NamespaceSpecifier   | Outputable                 | GHC.Hs.ImpExp             |
    | ForAllTyFlag         | Binary, NFData, Outputable | GHC.Hs.Specificity        |
    | Specificity          | Binary, NFData             | GHC.Hs.Specificity        |
    | PromotionFlag        | Binary, Outputable         | GHC.Types.Basic           |
    | FieldLabelString     | Outputable, Uniquable      | GHC.Types.FieldLabel      |
    | InlinePragma         | Binary                     | GHC.Types.InlinePragma    |
  
  -------------------------
  Metric Decrease:
      hard_hole_fits
  -------------------------
  
  Closes #21262, #27469
  

• ab9ab895
  by Cheng Shao at 2026-07-21T17:10:53-04:00

  rts: always use StgInt to represent cost center id
  
  Currently cost center id is modeled as `Int` and it should be `StgInt`
  uniformly in the RTS, hence this patch. Fixes #27524.
  

• 94d8f83b
  by Cheng Shao at 2026-07-22T11:30:40-04:00

  hadrian: clean up stale cabal package flags in the tree
  
  This patch cleans up stale cabal package flags in the tree and related
  hadrian/autoconf logic. Closes #27474.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 0bf1d8c9
  by Sasha Bogicevic at 2026-07-22T11:31:21-04:00

  parser: don't suggest ImportQualifiedPost when it is already enabled
  
  -Wprepositive-qualified-module unconditionally attached a hint to
  enable ImportQualifiedPost, even when the extension was already on
  (as it is by default under GHC2021). Record the extension's state in
  the PsWarnImportPreQualified diagnostic and drop the hint when it is
  already enabled.
  
  Fixes #27380
  

• 700a1dd1
  by Simon Jakobi at 2026-07-23T11:21:20-04:00

  ci: Reduce lint job setup costs
  
  Avoid fetching unnecessary history and submodules for lightweight lint
  jobs. Run changelog validation without Hadrian.
  
  Because the lint-author job is now based on the .lint template directly,
  we enhance it to allow Git to read from the runner-owned checkouts,
  In the previously used .lint-params template, this permissions issue was
  addressed via `chown`.
  
  Closes #27521.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• 26a44fb0
  by ARATA Mizuki at 2026-07-23T11:22:10-04:00

  testsuite: Fix memory issues of doublex2_* and simd010
  
  doublex2_* had reads from uninitialized memory.
  
  simd010 had out-of-bounds array access.
  
  Fixes #27544
  

• 4d798b17
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Eliminate STM_AWOKEN
  
  It was used as nullary closure for the block_info.closure in the case of
  a thread being awoken after an STM transaction.
  
  However, while it was written, it was never read, so contributed nothing
  to the behaviour. Furthermore, in the only place it was set (in
  tryWakeupThread) the why_blocked was immediately overwritten by the
  NotBlocked status, and the block_info was updated accordingly (by
  appendToRunQueue).
  
  So it didn't even serve a purpose of clarifying an intermediate state,
  there really was no such intermediate state.
  
  Cleaning this up will allow the BlockedOnSTM case to follow the same
  pattern as the other why_blocked cases that do not use the block_info,
  and in turn this reduces the number of different categories.
  

• e1cece79
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Document that eventlog thread stop code ThreadBlocked is no longer used
  
  It has not been used since GHC 7.0.x (2011). In 7.2 all the BlockedOn*
  codes were added, and these were and are used instead of ThreadBlocked.
  

• 795db115
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Add a proper mapping to eventlog external thread stop status
  
  That is the mapping from rts-internal codes, to the coes used in the
  status field in the eventlog EVENT_STOP_THREAD event.
  
  See issue #9003 for what goes wrong when we mess this up. In that
  ticket, people note that we should really not require the internal
  tso->why_blocked codes to leak into the external eventlog thread stop
  codes. The same principle applies to the StgThreadReturnCode.
  
  This change properly separates them, and explicitly maps between them
  using a pair of (compact, constant) tables. These tables are pretty
  small (with no alignment constraints) and will soon shrink so it seems
  a sensible tradeoff.
  
  We also introduce and use proper EVENT_STOP_THREAD constants in the
  event log format header. Previously there was not specification in the
  code for these (only in the docs): the values were encoded into the
  conversion code.
  
  This will allow us to renumber the internal why_blockd codes without
  breaking the eventlog output.
  

• 6f1c8efa
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Remove unused tso->block_info.wakeup member
  
  Presumably it was used once, but not now.
  

• 740b88a9
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Document StgTSOBlockInfo to say what cases use what members
  
  In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union,
  so we should be able to say for each union member the why_blocked cases
  that use that member.
  

• 5b92eae2
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Add a tso->block_info.mvar member and use it
  
  in preference to the generic block_info.closure union member, with
  casts.
  
  The plan is that when we know what case we're in (via tso->why_blocked)
  then we can always access the correct union member, and so we will only
  need to access block_info.closure for generic cases where we don't know
  or don't care.
  

• d931715f
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Add a tso->block_info.unused member and use it
  
  in preference to the generic block_info.closure union member, with
  casts.
  
  The plan is that when we know what case we're in (via tso->why_blocked)
  then we can always access the correct union member, and so we will only
  need to access block_info.closure for generic cases where we don't know
  or don't care.
  

• 47e28ebb
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Avoid storing to tso->block_info.closure
  
  In one case we can use a specific union member (.prev) instead. In
  several cases the stores were in fact redundant because of subsequent
  overwrites.
  
  In scavengeTSO we replace setting tso->block_info.closure to a valid
  closure, with an assertion that the block_info.unused is already set to
  END_TSO_QUEUE which is a valid (static) closure.
  

• 96e4749d
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Renumber the tso->why_blocked constants
  
  We can do this now because we have separated the internal values from
  the external ones used in the eventlog.
  
  This lets us put them back into a deliberate order and consolodate some
  gaps.
  
  More importantly, it is a prepation for a slightly more sophisticated
  encoding.
  

• 8f62661c
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Define constants for the existing stg_threadStatuszh return codes
  
  The stg_threadStatuszh reuses the internal tso->why_blocked codes but
  also extends them with a couple previously magic values. This is awkward
  since we need to know what those magic values are so we don't
  accidentally use those values to mean something else. By pulling a
  definition up to where the why_blocked codes are defined we will be able
  to avoid mistakenly assining those codes some meaning (or just changing
  the BlockedThreadComplete, BlockedThreadKilled code if necessary).
  

• 42c69ae2
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Extend the tso->why_blocked encoding to indicate block_info closures
  
  We use some bit tricks to cheaply and generically test if a
  tso->why_blocked tag implies that the corresponding tso->block_info will
  contain a non-trivial valid closure (i.e. not just block_info.unused set
  to END_TSO_QUEUE).
  
  In particular we arrange for most why_blocked values to naturally have a
  distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they
  can come in either non-closure or closure forms. We allow an additional
  bit to distinguish these cases. The non-closure forms are only from
  legacy I/O managers: select and win32-legacy. So this extra bit
  mechanism will be able to be retired once the legacy I/O managers are
  themselves retired.
  
  This means in a few places we need to untag the why_blocked value before
  inspecting it, but in most places we do not.
  

• 7c64632b
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Use BlockInfoForceNonClosure in the select I/O manager
  

• 8fd7104a
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Use BlockInfoForceNonClosure in the win32-legacy I/O manager
  
  for the BlockedOn{Read,Write} since these use the non-heap allocated
  StgAsyncIOResult.
  

• e0da603b
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Enforce the why_blocked and block_info rules in checkTSO
  
  We now check the cases wher IsBlockInfoClosure should hold, the cases
  that are supposed to use block_info.unused == END_TSO_QUEUE, and which
  cases are allowed to use BlockInfoForceNonClosure.
  
  This partially enforces the use of why_blocked as a tag for the
  block_info union. We could be stricter and check for the correct
  expected info table for the closure cases.
  

• 1dd0f381
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Use IsBlockInfoClosure to simplify several tests
  
  In GC and generic traversal we need to know if we should look at the
  block_info.closure or not. Now we can do just that using a cheap bit
  test on the why_blocked tag.
  
  This fixes issue 26717, where the problem was that some GC modes did not
  know when to look at block_info.closure, because the poll I/O manager
  uses a closure for BlockedOn{Read,Write} while the select I/O manager
  uses a non-closure. Now this information is in the why_blocked tag
  itself.
  

• 7a00ffbc
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Remove the now-unused scavengeTSOIOManager
  
  The GC no longer has to delegate to the I/O manager, since it can use
  IsBlockInfoClosure to decide things itself.
  

• 522a481f
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Remove duplicate assertion
  

• 0874d965
  by Duncan Coutts at 2026-07-23T17:26:18-04:00

  Follow atomic access rules more consistently for tso->why_blocked
  
  The rule is this:
  
  store block_info *before* why_blocked
  store why_blocked using store release
  
  load why_blocked using load acquire
  load block_info *after* why_blocked
  
  This is a an atomic store release / load acquire pair and (if the reads
  are in a separate thread to the writes, and the read receives the value
  stored) then this guarantees a full "happens before" relationship of
  these stores and loads.
  
  In some cases, we do not need a full load acquire, because we don't read
  the block_info at all and so do not need any ordering. In this case we
  just need an atomic relaxed load.
  
  This was being followed in most places, but not all. If there's good
  reason in any case that we don't need atomic access, then we should
  document that in a comment. In the absence of that I think it's easier
  to follow the rule everywhere.
  

• 8f0bdbe1
  by Duncan Coutts at 2026-07-23T17:26:19-04:00

  Add a changelog entry
  

• 4fdfe757
  by Alan Zimmerman at 2026-07-23T17:27:06-04:00

  EPA: Keep decls together in ClassDecl
  
  Similar to 1718230f4d3d19d8c49c0e5d496cb0fb6f399528 for HsValBindsLR,
  this commit updates ClassDecl so that it no longer splits out the
  assorted `LHsDecl GhcPs` until the renamer.
  
  It does this by inserting a type family (separate from the classic TTG one) for this.
  
  So
  
  data TyClDecl
    ...
    | ClassDecl {
      ...
         tcdDecls   :: XClassDecls pass
  
  with
  
  type instance XClassDecls GhcPs = [LHsDecl GhcPs]
  type instance XClassDecls GhcRn = ClassDeclX GhcRn
  type instance XClassDecls GhcTc = ClassDeclX GhcTc
  
  data ClassDeclX pass
    = ClassDeclX { tcdSigs    :: [LSig pass],              -- ^ Methods' signatures
                   tcdMeths   :: LHsBinds pass,            -- ^ Default methods
                   tcdATs     :: [LFamilyDecl pass],       -- ^ Associated types;
                   tcdATDefs  :: [LTyFamDefltDecl pass],   -- ^ Associated type defaults
                   tcdDocs    :: [LDocDecl pass]           -- ^ Haddock docs
      }
  

• f586c885
  by Simon Jakobi at 2026-07-24T18:05:00-04:00

  ci: Use shallow submodule clones by default
  
  Limit submodule clones to depth one to reduce CI checkout costs. Keep
  fetching full submodule history for the submodule lint jobs, which
  inspect commits across a range.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• 306120d2
  by Duncan Coutts at 2026-07-24T18:05:43-04:00

  Fix flaky test T3994 on FreeBSD
  
  On current FreeBSD versions, calling getpgid on a zombie process fails.
  In T3994, if we're really unlucky with delays and scheduling then we can
  end up in exactly that situation.
  
  Just catch that specific exception and ignore it. It's rare, and not our
  fault.
  

• 7b116a0b
  by Cheng Shao at 2026-07-24T18:06:24-04:00

  ci: add missing workaround for docker permissions in lint jobs
  
  Some lint jobs use ci-images with default user `ghc`, and the gitlab
  ci docker executor requires the `sudo chown` workaround to fix
  workspace directory permission issue. This patch adds the missing
  workarounds for the lint jobs. Fixes #27554.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 815149f3
  by Andrzej Rybczak at 2026-07-25T15:06:43+00:00

  Add -Wdefaulted-callstack
  
  Adds a new warning, -Wdefaulted-callstack, which warns when an implicit
  CallStack parameter is defaulted to the empty stack. In particular, this
  includes call sites where a function with a HasCallStack constraint is called
  from a definition that does *not* provide one. At such call sites the call stack
  is cut off and does not include the enclosing definition's callers, which can be
  a source of surprise if the user wants complete call stacks.
  
  Closes #27077.
  

• f6f2343f
  by Zubin Duggal at 2026-07-25T17:40:51-04:00

  UniqueDFM: alter should preserve insertion order
  
  Before it always inserting new elements at the end.
  This is problematic because instances get inserted into the map with
  `alterF`, which can change ordering of how instances are printed
  with `:info` depending on the order in which we consult interfaces
  
  I expect `alter id k = id` and `alter (fmap f) k = adjust f k`. Moving keys to
  the end breaks that (`adjust` already preserves position).
  
  Fixes #27532
  

• 5d0ab71a
  by fendor at 2026-07-27T17:31:05-04:00

  Introduce global unit database cache
  
  As a first step for better sharing of `UnitInfo` across `UnitEnv`,
  we introduce a new datatype called `ExternalUnitDatabases`.
  
  It primarily serves as an in-memory representation of *all*
  `UnitDatabase`s across `UnitEnv`. This means, if multiple `HomeUnitEnv`s
  depend on the same database, one way or another, we make sure that we
  don't parse from disk every time.
  Instead, we store the in-memory representation in `ExternalUnitDatabases`.
  
  `ExternalUnitDatabaseCache` is the equivalent of `ExternalUnitState` in
  the `UnitEnv`. It is a mutable variable wrapping `ExternalUnitDatabases`.
  
  The mutable `ExternalUnitDatabaseCache` is used in `initUnits` to make
  sure we don't parse the same unit database multiple times.
  
  Almost by accident, we change the semantics of `initUnits` to honour
  modifications to `packageDBFlags`.
  The inability to change `packageDBFlags` while also reusing the already
  parsed `UnitDatabase`s was reported in #26423 as a bug.
  Hence, we think this behaviour change is warranted and acceptable,
  especially since it comes with a breaking change to the `initUnits` API.
  
  Add regression test for #26423
  Closes #26423
  

• 6cce494a
  by fendor at 2026-07-27T17:31:05-04:00

  Introduce UnitIndex for global external unit caching
  
  `UnitInfo`s have been observed to cause a lot of memory usage in #27500.
  Especially with multiple home units, as the same (external) units are
  processed from scratch, even though most of the time we end up with
  exactly the same `UnitInfo`.
  
  We introduce a `UnitEnv` global cache that allows us to store external
  unit information that is used across all `HomeUnitEnv`s.
  
  The most important change in this commit is the introduction of the `UnitIndex`.
  It stores a global mapping of `UnitId` -> `UnitInfo`, and `initUnits`
  always uses the cached `UnitInfo` entry to populate each
  `HomeUnitEnv`'s `UnitState`.
  This allows us to ensure the following property:
  
  > Each `UnitInfo` should be alive exactly once in GHC.
  
  All `UnitState`s should reference 'UnitInfo's stored in the 'UnitIndex'.
  This ensured by calling 'initUnits' with the 'UnitIndex'.
  
  In addition, the `ExternalUnitDatabases` may also hold a reference
  to each on-disk representation of `UnitInfo`.
  
  This means, we impose an hard upper bound on the number of `UnitInfo`s
  alive in the GHC session:
  
  > The number of alive `UnitInfo`s closure objects must be the
  > sum of all loaded unit database times two.
  
  We add performance regression tests that make sure the number of live
  `UnitInfo` cannot exceed this threshold.
  
  Closes #27500
  
  -------------------------
  Metric Decrease:
      MultiComponentModules
      MultiComponentModulesRecomp
      MultiComponentModulesRecomp100
      mhu-perf
      LinkableUsage02
  -------------------------
  
  These metrics increases are especially notable, as we are not even
  sharing anything big but merely the global package database with 50
  entries.
  It shows how careful sharing of `UnitInfo` can improve memory usage.
  We expect this to be much more notable when the whole cabal package
  database is shared across multiple home units.
  
  `LinkableUsage02` metric decreases on unreg and i386 platform, only.
  
  ---
  
  Technical details
  
  To share the `UnitInfo`s correctly, it is important that we extract
  the `WireMap` into the `UnitIndex`. At the moment of writing, `WireMap`
  must be globally the same for all `HomeUnitEnv`s.
  This is important, as we could otherwise not cache the "fully-resolved"
  `UnitInfo`, as we don't change the `UnitId` or `unitAbiHash` when
  resolving wired-in units. Thus, there could be ambiguities, when the
  `WireMap` is not the same for all `UnitState`s across the `UnitEnv`.
  
  We consider a `UnitInfo` fully-resolved, if wired-in units have been
  updated, the `UnitInfo` has been validated and variables in the unit
  config, such as `${pkgroot}` have been resolved.
  
  Updating the wired-in units requires the `WireMap` to be globally the
  same.
  

• f8e3bee9
  by Zubin Duggal at 2026-07-27T17:31:49-04:00

  testsuite: skip runtime stats tests on debugged compilers
  
  Debugged flavours build the boot libraries without optimisation, so the
  runtime numbers do not match the baselines.
  

• 1e326770
  by Zubin Duggal at 2026-07-27T17:31:50-04:00

  testsuite: mark #20706 tests fragile rather than broken
  
  Whether the static linux linker issues manifest depends on the host
  toolchain.
  

• c0b13cbe
  by Zubin Duggal at 2026-07-27T17:31:50-04:00

  testsuite: exclude libnuma from mostly-static
  
  It needs static system libraries (libnuma.a) that many platforms do not
  ship.
  
  Fixes #26914
  

• bee1913d
  by Alan Zimmerman at 2026-07-28T16:42:29-04:00

  EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs
  
  Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit
  changes the as-parsed representation of class instance declarations to
  [LHsDecl GhcPs], and only separates them by type from the renamer onward.
  
  This also allows us to remove all the AnnSortKey machinery for exact
  printing, as it is now no longer needed.
  

• 72c55eee
  by Cheng Shao at 2026-07-28T16:43:11-04:00

  hadrian: implement and use writeFileAtomic to fix race condition
  
  This patch implements `writeFileAtomic` in hadrian and change all
  invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`,
  to avoid multiple hadrian concurrent invocations overwriting the same
  in-tree generated file not in the build root directory. Fixes #27536.
  Additional notes:
  
  - `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since
    it involves reading the file's older version, so their uses are left
    alone. It doesn't affect #27536 given their outputs are contained in
    the build root directory.
  - It's possible to shrink this patch by only making writes outside the
    build root directory atomic. But I think it's not worth the effort
    for fine grained distinction here, and atomic writes within the
    build root directory should also improve robustness of a hadrian
    build.
  - In the longer term we do want to make a ghc build only generate
    files within the build root directory, though that's a lot of work
    and outside the scope of this particular bugfix.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 46d4f963
  by Sylvain Henry at 2026-07-29T06:38:40-04:00

  RTS: correctly mark slop bytes when shrinking large arrays (#19048)
  
  Correctly mark slop bytes even when profiling is off so that heap census
  doesn't traverse garbage-collected closures.
  

• 4762a8bf
  by Simon Jakobi at 2026-07-29T06:39:23-04:00

  Add -XLazyFieldAnnotations (GHC proposal 752)
  
  Unbundle the prefix `~` lazy field annotation syntax from StrictData. The
  new LazyFieldAnnotations extension controls whether `~` is accepted on
  constructor fields. StrictData (and Strict, transitively) imply the new
  extension.
  
  See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-lazy-field-annotations.rst.
  
  Closes #24455.
  
  Assisted-by: Claude Opus 4.8
  

• 0b6dcc84
  by Simon Jakobi at 2026-07-29T06:40:04-04:00

  testsuite: Relax T24471 residency tolerance
  
  T24471 peak residency fluctuates enough on i386 to cause spurious
  failures. Use the standard residency tolerance while retaining the
  existing allocation threshold.
  
  See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• 90e95b34
  by Cheng Shao at 2026-07-29T06:40:45-04:00

  compiler: fix missing top-level procedure labels in cmm dumps
  
  This patch fixes missing top-level procedure labels in some
  intermediate Cmm pass dumps. Fixes #27553.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 360a5946
  by sheaf at 2026-07-29T06:41:35-04:00

  Add some type-family-heavy performance tests
  
  FamAppCachePerf stress-tests the performance of lookups in the
  type family application cache.
  
  T27336 is a minimisation extracted from the reported reproducer.
  
  SimplCastPerf is a measure of coercion growth due to the simplifier
  calling mkTransCo without re-optimising the result.
  

• 3ec9e2b9
  by Mike Pilgrem at 2026-07-31T08:21:33-04:00

  GHC Guide: Improve docs on response files
  

• e5b2a1f7
  by sheaf at 2026-07-31T08:22:23-04:00

  Disable Core Lint for TcPlugin_RewritePerf
  
  This is a compiler performance test, but the test source hard-coded
  -dcore-lint, defeating the measurement.
  
  -------------------------
  Metric Decrease:
      TcPlugin_RewritePerf
  -------------------------
  

• 85b10c00
  by Alan Zimmerman at 2026-07-31T22:09:47+01:00

  EPA: Remove LocatedP from OverlapMode
  
  We have
  
    type LocatedP = GenLocated SrcSpanAnnP
    type SrcSpanAnnP = EpAnn AnnPragma
  
  As the first step in removing this in favour of LocatedA which only
  captures location, comments and trailing annotations, we remove it
  from OverlapMode
  
  We do this by moving the AnnPragma into the TTG extension point
  instead.
  

• c9a34a00
  by Viktor Dukhovni at 2026-08-02T04:34:17-04:00

  Fix note typo
  

• 4f2a21f7
  by Andreas Klebinger at 2026-08-02T22:46:46-04:00

  Apply oneShot Monad trick to STG LintM
  

• 21e4b89d
  by Andreas Klebinger at 2026-08-02T22:46:46-04:00

  stgLint: Use a single reader env for read only arguments.
  

• d415f38a
  by Alan Zimmerman at 2026-08-02T22:47:27-04:00

  EPA: Remove LocatedP from CType
  
  The next step of removing use of LocatedP by moving
  the AnnPragma for CType into its TTG extension point
  instead.
  

• 8fc6f882
  by Simon Jakobi at 2026-08-05T14:53:41-04:00

  testsuite: Don't crash on non-UTF-8 test output
  
  read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded
  strictly (the first three with UTF-8, read_diff with the locale
  encoding), so a test emitting invalid UTF-8 (binary output, or a crash
  truncating a multi-byte character) raised UnicodeDecodeError and was
  reported as a framework failure instead of its actual result.
  
  Decode with errors='replace', like read_no_crs and safe_print.
  
  Assisted-by: Claude Fable 5
  

• 56534866
  by Simon Jakobi at 2026-08-05T14:53:41-04:00

  testsuite: Colorize the test summary, also in CI
  
  The summary headings were plain, and SUMMARY was colored unconditionally,
  so the escapes also ended up in the file written by --summary-file.
  Color is now decided per output sink via term_color.colored_if; see the
  comments in term_color.
  
  CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so
  add --force-colors and pass it in .gitlab/ci.sh.
  
  Assisted-by: Claude Opus 5
  

• bceb541a
  by Simon Jakobi at 2026-08-05T14:53:42-04:00

  testsuite: Repeat unexpected failure output in the summary
  
  Finding out why a test failed meant scrolling back through a possibly
  very long log to the point where the test ran. The summary now repeats
  the captured output of unexpected failures, before the statistics, so
  the most interesting part is at the end of the log (#16720).
  
  Output mismatches report their diff instead of the mismatching stream
  (see Note [Redundant output in test results]). The repeated output is
  bounded per stream, and skipped altogether beyond
  MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in
  several ways share one block.
  
  Test results now report a source-relative directory, stable regardless
  of where the run was started from.
  
  Assisted-by: Claude Fable 5
  

• 2ab02c57
  by Ben Gamari at 2026-08-05T14:54:24-04:00

  base: Don't drop exception context in SomeException(toException)
  
  For reasons that are lost to time, the implementation of [CLC #200]
  that was merged inappropriately dropped `ExceptionContext` in the
  `toException` implementation given to `SomeException`.
  
  Fix this infelicity.
  
  [CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200
  

• 126ce574
  by Vladislav Zavialov at 2026-08-05T14:55:05-04:00

  Test case for #20902
  
  Starting with GHC 9.14.1 (the first major release to include 51e3ec83),
  and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68
  and b30f25591e), all examples in this ticket are handled as expected.
  

• b14d8d59
  by Alan Zimmerman at 2026-08-05T14:55:46-04:00

  EPA: Remove LocatedP, last use in WarningTxt
  
  The last step of removing LocatedP, by moving the AnnPragma for
  WarningTxt into its TTG extension point instead.
  
  This also allows us to remove LocatedP and SrcSpanAnnP
  

• 70b58c8f
  by Vladislav Zavialov at 2026-08-05T14:56:27-04:00

  Test cases for #18725
  
  Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in
  this ticket no longer panics. A standalone kind signature breaks the recursive
  loop, so the type constructor can be used in a kind within its own group.
  
  T18725a checks that this is accepted with the signature present, while T18725b
  confirms it is still rejected without it.
  

• b18c8dd5
  by Zubin Duggal at 2026-08-06T15:51:01-04:00

  hie files: Dump the type table when dumping with -ddump-hie
  

• f839d0fb
  by Zubin Duggal at 2026-08-06T15:51:01-04:00

  hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast
  
  Fixes #25709
  

• 5753ebaa
  by Simon Jakobi at 2026-08-06T15:51:43-04:00

  testsuite: fix stale paths for the ghc-config build artifacts
  
  ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in
  6c7a49139c, but the .gitignore entry and the clean rule still referred to
  the old location. As a result the compiled ghc-config binary, which
  boilerplate.mk rebuilds on every make-driven test run, showed up as an
  untracked file and was never cleaned.
  
  Assisted-by: Claude Opus 5
  

• 246d4d72
  by Simon Peyton Jones at 2026-08-06T15:52:25-04:00

  Documentation only
  
  ...driven by my investigation of #27591
  

• be69e9df
  by Alan Zimmerman at 2026-08-06T15:53:05-04:00

  EPA: Replace AnnPragma with individual types
  
  We introduced AnnPragma as a common type for all pragma usages wrapped
  in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma
  moved into the TTG points for the given items, we can ensure that each
  carries only the annotations it needs.
  
  So we remove AnnPragma, and in its place bring in
    AnnCType
    AnnWarningTxt
    AnnOverlap
    AnnAnnDecl
    AnnPragSCC
  

• 0779e12c
  by Simon Jakobi at 2026-08-07T12:36:11-04:00

  Cmm: print unreachable blocks under -dppr-debug (#27368)
  
  Unreachable blocks linger in a CmmGraph's block map for most of the Cmm
  pipeline, but pprCmmGraph only ever printed the blocks reachable from the
  entry, so dumps looked consistent while the graph was not. Issues like
   #27368 were hard to debug due to this.
  
  pprCmmGraph now appends the stored-but-unreachable blocks under a
  "// unreachable blocks:" heading when -dppr-debug is on.
  See Note [unreachable blocks] in GHC.Cmm.Pipeline.
  
  Assisted-by: Claude Opus 5
  

• 3a0f9a51
  by Simon Peyton Jones at 2026-08-07T12:36:54-04:00

  Fix three bugs related to required type args and INLINE pragmas
  
  * `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front,
    leading to a Lint error (#27557)
  
  * The arity in an InlineSaturation is the VisArity not the Arity; the
    two can differ when we have "required" type arguments.  This made the
    INLINE pragma argument counting go wrong in `makeCorePair` (#27590).
  
  * When a simple binding has a type signature, we take special path in `tcPolyCheck`,
    leading to an outer `AbsBinds` that has no dictionaries, even when the binding
    is in fact overloaded.  That confused the inline-arity computation in
    `makeCorePair` (#27589).
  
  The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`.
  That actually simplifies the API of `makeCorePair`, which is nice.
  
  The first bug is fixed by swapping the visiblity flags in
  `GHC.Core.Opt.Arity.mkEtaForAllMCo`
  
  Getting the INLINE behaviour right led to some perf changes:
    * Runtime /halved/ on T7954 due to better specialisation
    * Compile time increased by 6% in T21839c because a bit more inlining
      happened, as it always should have done.
    * For some reason compile-time max-bytes-used dropped by 30% on
      T27336, but only on one build configuration; and it increased
      on LinkableUsage02 by 6% on another configuration
  
  Geometric mean effect on our compile time benchmarks is +0.1%.
  
  Metric Decrease:
      T27336
      T7954
  Metric Increase:
      LinkableUsage02
      T21839c
  

• 4f985108
  by Vladislav Zavialov at 2026-08-07T17:49:50-04:00

  Discard type arguments in tcPatToExpr (#27440, #27583)
  
  The builder expression of an implicitly bidirectional pattern synonym must not
  mention types written in the RHS:
  
    * Invisible type arguments led to a panic (#27440)
    * Required type arguments failed with out-of-scope variables (#27583)
  
  Both are now discarded, following the precedent established by pattern
  signatures (#9867).
  
  Discarding type arguments takes some care: a type pattern cannot be told from a
  value pattern by syntax alone, as the `type` keyword may be omitted. Consider:
  
      data T a b c where
        MkT :: forall a. forall b c -> a -> T a b c
  
      pattern P :: x -> T x y z
      pattern P x = MkT @a (type b) c x
  
  In P's right-hand side, `@a` and `type b` are clearly type arguments, but what
  about `c` and `x`? We can only tell by matching the patterns against MkT's
  type. So tcPatToExpr now runs in TcM and matches the arguments against the
  constructor's TyVarBinders using zipPatsBndrs, which is made public for this
  purpose. The resulting builder is $bP x = MkT _ _ x.
  
  See Note [Discarding types in the builder expression].
  
  Test cases: T27440a T27440b T27440c T27440d T27440e
              T27583a T27583b T27583c T27583d T27583e T27583f T27583g
  
  Metric Increase: LinkableUsage02
  Metric Decrease: T27336
  
  Assisted-by: Claude Opus 5
  

• eb1dcd4d
  by sheaf at 2026-08-07T17:50:40-04:00

  mkWpFun_FRR: fix ordering of coercion composition
  
  When the subsumption machinery generates an eta-expansion, we must
  perform a representation polymorphism check to ensure the lambda binder
  it introduces has a fixed runtime representation.
  This is done in GHC.Tc.Utils.mkWpFun_FRR.
  
  This check involves composing quite a few coercions, arising from
  representation-polymorphism checks on both the actual and expected
  argument types. These coercions are then chained using HsWrapper
  composition, <.>. The ordering of composition was incorrect, leading to
  the Core Lint failure reported in #27639. This commit fixes that.
  
  Fixes #27639
  

• 3a552476
  by Simon Jakobi at 2026-08-09T15:20:06-04:00

  Word64Map: add compareSize
  
  compareSize m c compares the size of a map to an Int, but unlike
  compare (size m) c it stops traversing the map once the outcome is
  determined.
  
  Based on https://github.com/haskell/containers/pull/1139
  
  Assisted-by: Claude Opus 5
  

• 6e2c99d8
  by Simon Jakobi at 2026-08-09T15:20:06-04:00

  Use a pigeonhole sort for deterministic UniqDFM iteration
  
  Deterministic UniqDFM iteration used a list mergesort, allocating O(n
  log n) cons cells and contributing significantly to compiler allocations
  (#27459).
  
  Use a pigeonhole sort where appropriate, while retaining the mergesort
  fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic
  iteration].
  
  The peak_megabytes_allocated increase for LinkableUsage02 is probably
  due to GC timing noise. See #27613.
  
  -------------------------
  Metric Decrease:
      InstanceMatching
      InstanceMatching1
      ManyAlternatives
      T12707
      T13379
      T13719
      T24471
      T27336
      T5321FD
      T5321Fun
      T783
  Metric Increase 'peak_megabytes_allocated':
      LinkableUsage02
  -------------------------
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• a938ab12
  by sheaf at 2026-08-09T15:20:48-04:00

  Testsuite: don't measure max residency for T27336
  
  We really care more about total allocations for this test, so this commit
  removes the maximum residency measurement.

• 7d94bb78
  by Alan Zimmerman at 2026-08-09T15:21:29-04:00

  EPA: Remove LocatedE, replace with LocatedA
  
  This gets rid of one more LocatedXXX occurrence
  

• 61200c2f
  by Wolfgang Jeltsch at 2026-08-10T16:24:42+03:00

  Move the implementation of `Control.Monad.Zip` to `base`
  

2811 changed files:

• .gitignore
• .gitlab-ci.yml
• .gitlab/ci.sh
• .gitlab/generate-ci/flake.lock
• .gitlab/generate-ci/gen_ci.hs
• .gitlab/issue_templates/default.md
• + .gitlab/issue_templates/release_tracking.md
• .gitlab/jobs.yaml
• .gitlab/merge_request_templates/Default.md
• .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
• .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
• .gitlab/test-metrics.sh
• .gitmodules
• boot
• + changelog.d/21101
• + changelog.d/26616
• + changelog.d/27380
• + changelog.d/27532
• + changelog.d/AbstractQ
• + changelog.d/T15973
• + changelog.d/T17833
• + changelog.d/T19174.md
• + changelog.d/T21176
• + changelog.d/T21628
• + changelog.d/T25636
• + changelog.d/T26423
• + changelog.d/T26532
• + changelog.d/T26716
• + changelog.d/T26978
• + changelog.d/T26979
• + changelog.d/T27022
• + changelog.d/T27046
• + changelog.d/T27047
• + changelog.d/T27121.md
• + changelog.d/T27123.md
• + changelog.d/T27124.md
• + changelog.d/T27131
• + changelog.d/T27182.md
• + changelog.d/T27202
• + changelog.d/T27225
• + changelog.d/T27261
• + changelog.d/T27308
• + changelog.d/T27314.md
• + changelog.d/T27317
• + changelog.d/T27329
• + changelog.d/T27359
• + changelog.d/T27360
• + changelog.d/T27368-ppr-unreachable-cmm-blocks.md
• + changelog.d/T27374
• + changelog.d/T27386
• + changelog.d/T27440
• + changelog.d/T27455
• + changelog.d/T27456
• + changelog.d/T27557
• + changelog.d/T27583
• + changelog.d/T27589
• + changelog.d/T27639
• + changelog.d/add_can_drop_to_occurence_analyser
• + changelog.d/binary-array-no-list
• + changelog.d/bump-process
• + changelog.d/bytecode-interpreter-hpc-support
• + changelog.d/changelog-entries
• + changelog.d/cmm-import-syntax-changes
• + changelog.d/config
• + changelog.d/deterministic-usage-order
• + changelog.d/dynamic-trace-flags
• + changelog.d/elem-via-foldr-27096
• + changelog.d/fix-absent-dict-projection
• + changelog.d/fix-blackhole-handling
• + changelog.d/fix-cmm-atomic-load-store
• + changelog.d/fix-cmm-dump-labels
• + changelog.d/fix-compacting-gc-ap-27434
• + changelog.d/fix-duplicate-pmc-warnings
• + changelog.d/fix-exponential-case-desugar-27383
• + changelog.d/fix-finalizers-27072
• + changelog.d/fix-ghci-duplicate-warnings-26233
• + changelog.d/fix-heap-census-large-arrays-19048
• + changelog.d/fix-layout-stack-fcall
• + changelog.d/fix-make-install-j
• + changelog.d/fix-peekitbl-no-tntc
• + changelog.d/fix-plugin-finder-multi-home-unit.md
• + changelog.d/fix-unreg
• + changelog.d/fix-use-std-ap-thunk
• + changelog.d/generically-mconcat
• + changelog.d/ghc-api-epa-parens
• + changelog.d/ghc-api-holes-ast-27111
• + changelog.d/ghc-api-namespace-specifier-26678
• + changelog.d/ghc-pkg-faster-closure
• + changelog.d/ghc-pkg-long-path-support
• + changelog.d/hadrian-response-files.md
• + changelog.d/hadrian-stale-package-confs-26661
• + changelog.d/hadrian-system-cxx-std-lib-25303
• + changelog.d/hadrian-warn-missing-package-index-16484
• + changelog.d/inter-module-far-jumps-aarch64-default
• + changelog.d/interactive-error-hints
• + changelog.d/ipe-event-class
• + changelog.d/jobserver-leak-fix
• + changelog.d/lazy-field-annotations
• + changelog.d/lib-add-tuple-tyfam-27179
• + changelog.d/libdir-setting
• + changelog.d/llvm-22
• + changelog.d/module-graph-reuse-in-downsweep
• + changelog.d/more-efficient-home-unit-imports-finding
• + changelog.d/no-more-timer-signal
• + changelog.d/pp-set-ghc-version
• + changelog.d/reexported-module-errors
• + changelog.d/remove-bignum-check-backend
• + changelog.d/remove-bignum-ffi-backend
• + changelog.d/remove-ddump-json-flag
• + changelog.d/rts_symlinks.md
• + changelog.d/semaphore-v2
• + changelog.d/simd_constant_folding
• + changelog.d/skip-test
• + changelog.d/so_inline_is_a_predicate
• + changelog.d/stable-core-dump-order-27296
• + changelog.d/stage2-cross-compilers
• + changelog.d/tag-inference-27005
• + changelog.d/tcplugin_init.md
• + changelog.d/tcplugins-pmc.md
• + changelog.d/tool-messages-27370
• + changelog.d/typecheckModule-API.md
• + changelog.d/unit-index
• + changelog.d/unused-type
• + changelog.d/warn-defaulted-callstack
• + changelog.d/wasm-fix-serviceworker
• + changelog.d/windows-rethrow-overlapped-exception
• + changelog.d/withTcPlugins.md
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• compiler/GHC/Core/Opt/WorkWrap.hs
• compiler/GHC/Core/Opt/WorkWrap/Utils.hs
• compiler/GHC/Core/Ppr.hs
• compiler/GHC/Core/RoughMap.hs
• compiler/GHC/Core/Rules.hs
• compiler/GHC/Core/SimpleOpt.hs
• compiler/GHC/Core/Subst.hs
• compiler/GHC/Core/Tidy.hs
• compiler/GHC/Core/TyCo/FVs.hs
• compiler/GHC/Core/TyCo/Ppr.hs
• compiler/GHC/Core/TyCo/Rep.hs
• compiler/GHC/Core/TyCo/Subst.hs
• compiler/GHC/Core/TyCon.hs
• compiler/GHC/Core/TyCon/Env.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Unfold.hs
• compiler/GHC/Core/Unify.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToStg.hs
• compiler/GHC/CoreToStg/AddImplicitBinds.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/BooleanFormula.hs
• compiler/GHC/Data/FastString.hs
• compiler/GHC/Data/FastString/Env.hs
• compiler/GHC/Data/IOEnv.hs
• compiler/GHC/Data/List/NonEmpty.hs
• compiler/GHC/Data/List/SetOps.hs
• compiler/GHC/Data/Pair.hs
• compiler/GHC/Data/StringBuffer.hs
• compiler/GHC/Data/TrieMap.hs
• compiler/GHC/Data/Word64Map/Internal.hs
• compiler/GHC/Data/Word64Map/Lazy.hs
• compiler/GHC/Data/Word64Map/Strict.hs
• compiler/GHC/Data/Word64Map/Strict/Internal.hs
• compiler/GHC/Driver/Backend.hs
• compiler/GHC/Driver/Backpack.hs
• compiler/GHC/Driver/CodeOutput.hs
• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/CmmToLlvm.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Config/Interpreter.hs
• compiler/GHC/Driver/Config/StgToCmm.hs
• compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env.hs
• compiler/GHC/Driver/Env/Types.hs
• compiler/GHC/Driver/Errors.hs
• compiler/GHC/Driver/Errors/Ppr.hs
• compiler/GHC/Driver/Errors/Types.hs
• compiler/GHC/Driver/Flags.hs
• compiler/GHC/Driver/Hooks.hs
• compiler/GHC/Driver/Main.hs
• + compiler/GHC/Driver/Main/Compile.hs
• compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot
• + compiler/GHC/Driver/Main/Hsc.hs
• + compiler/GHC/Driver/Main/Interactive.hs
• + compiler/GHC/Driver/Main/Passes.hs
• + compiler/GHC/Driver/Main/Passes.hs-boot
• compiler/GHC/Driver/Make.hs
• compiler/GHC/Driver/MakeAction.hs
• compiler/GHC/Driver/MakeSem.hs
• compiler/GHC/Driver/Phases.hs
• compiler/GHC/Driver/Pipeline.hs
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Pipeline/Monad.hs
• compiler/GHC/Driver/Pipeline/Phases.hs
• compiler/GHC/Driver/Plugins.hs
• compiler/GHC/Driver/Session.hs
• compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs.hs
• compiler/GHC/Hs/Basic.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• compiler/GHC/Hs/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/Extension/Pass.hs
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Instances.hs
• compiler/GHC/Hs/Lit.hs
• compiler/GHC/Hs/Pat.hs
• − compiler/GHC/Hs/Specificity.hs
• compiler/GHC/Hs/Stats.hs
• compiler/GHC/Hs/Syn/Type.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Arrows.hs
• compiler/GHC/HsToCore/Binds.hs
• compiler/GHC/HsToCore/Breakpoints.hs
• + compiler/GHC/HsToCore/Breakpoints/Types.hs
• compiler/GHC/HsToCore/Coverage.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Errors/Ppr.hs
• compiler/GHC/HsToCore/Errors/Types.hs
• compiler/GHC/HsToCore/Expr.hs
• compiler/GHC/HsToCore/Foreign/C.hs
• compiler/GHC/HsToCore/Foreign/JavaScript.hs
• compiler/GHC/HsToCore/Foreign/Wasm.hs
• compiler/GHC/HsToCore/Match.hs
• compiler/GHC/HsToCore/Match.hs-boot
• compiler/GHC/HsToCore/Match/Constructor.hs
• compiler/GHC/HsToCore/Match/Literal.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/Iface/Binary.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/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/Syntax.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Type.hs
• compiler/GHC/Iface/Warnings.hs
• compiler/GHC/IfaceToCore.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/Types.hs
• compiler/GHC/Linker/Unit.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/HaddockLex.x
• compiler/GHC/Parser/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/Tag.hs
• compiler/GHC/Platform/Ways.hs
• compiler/GHC/Prelude/Basic.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Doc.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/Breakpoints.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Interpreter/Init.hs
• compiler/GHC/Runtime/Interpreter/JS.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/Constants.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/Lint.hs
• compiler/GHC/Stg/Pipeline.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/Closure.hs
• compiler/GHC/StgToCmm/Config.hs
• compiler/GHC/StgToCmm/DataCon.hs
• compiler/GHC/StgToCmm/Env.hs
• compiler/GHC/StgToCmm/Expr.hs
• compiler/GHC/StgToCmm/Foreign.hs
• compiler/GHC/StgToCmm/Heap.hs
• compiler/GHC/StgToCmm/InfoTableProv.hs
• compiler/GHC/StgToCmm/Layout.hs
• compiler/GHC/StgToCmm/Lit.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/Prof.hs
• compiler/GHC/StgToCmm/Ticky.hs
• compiler/GHC/StgToCmm/Utils.hs
• compiler/GHC/StgToJS/FFI.hs
• compiler/GHC/StgToJS/Ids.hs
• compiler/GHC/StgToJS/Literal.hs
• compiler/GHC/StgToJS/Object.hs
• compiler/GHC/StgToJS/Prim.hs
• compiler/GHC/SysTools/Cpp.hs
• compiler/GHC/SysTools/Process.hs
• compiler/GHC/SysTools/Tasks.hs
• compiler/GHC/SysTools/Terminal.hs
• compiler/GHC/Tc/Deriv.hs
• compiler/GHC/Tc/Deriv/Generate.hs
• compiler/GHC/Tc/Deriv/Generics.hs
• compiler/GHC/Tc/Deriv/Infer.hs
• compiler/GHC/Tc/Deriv/Utils.hs
• compiler/GHC/Tc/Errors.hs
• compiler/GHC/Tc/Errors/Hole.hs
• compiler/GHC/Tc/Errors/Hole/FitTypes.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.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/Expand.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Expr.hs
• compiler/GHC/Tc/Gen/Expr.hs-boot
• compiler/GHC/Tc/Gen/Foreign.hs
• compiler/GHC/Tc/Gen/Head.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Match.hs
• compiler/GHC/Tc/Gen/Match.hs-boot
• compiler/GHC/Tc/Gen/Pat.hs
• compiler/GHC/Tc/Gen/Sig.hs
• compiler/GHC/Tc/Gen/Splice.hs
• compiler/GHC/Tc/Gen/Splice.hs-boot
• compiler/GHC/Tc/Instance/Class.hs
• compiler/GHC/Tc/Instance/Family.hs
• compiler/GHC/Tc/Instance/FunDeps.hs
• compiler/GHC/Tc/Instance/Typeable.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/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/Rewrite.hs
• compiler/GHC/Tc/Solver/Solve.hs
• compiler/GHC/Tc/Solver/Types.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/Class.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/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/LclEnv.hs
• compiler/GHC/Tc/Types/Origin.hs
• compiler/GHC/Tc/Types/Origin.hs-boot
• compiler/GHC/Tc/Types/Rank.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/TcType.hs
• compiler/GHC/Tc/Utils/TcType.hs-boot
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/TcType.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Arity.hs
• compiler/GHC/Types/Basic.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/HpcInfo.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/Cache.hs
• compiler/GHC/Types/Name/Env.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/SourceError.hs
• compiler/GHC/Types/SourceText.hs
• compiler/GHC/Types/SrcLoc.hs
• compiler/GHC/Types/Tickish.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/Unique/DFM.hs
• compiler/GHC/Types/Unique/DSet.hs
• compiler/GHC/Types/Unique/FM.hs
• compiler/GHC/Types/Unique/Supply.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Types/Var/Env.hs
• + compiler/GHC/Types/Var/FV.hs
• compiler/GHC/Types/Var/Set.hs
• compiler/GHC/Unit.hs
• compiler/GHC/Unit/Env.hs
• + compiler/GHC/Unit/External/Database.hs
• + compiler/GHC/Unit/External/Index.hs
• + compiler/GHC/Unit/External/ModuleOrigin.hs
• + compiler/GHC/Unit/External/Providers.hs
• + compiler/GHC/Unit/External/Query.hs
• + compiler/GHC/Unit/External/Substitution.hs
• + compiler/GHC/Unit/External/Validate.hs
• + compiler/GHC/Unit/External/Visibility.hs
• + compiler/GHC/Unit/External/Wired.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Finder/Types.hs
• compiler/GHC/Unit/Home/Graph.hs
• compiler/GHC/Unit/Home/ModInfo.hs
• compiler/GHC/Unit/Info.hs
• compiler/GHC/Unit/Module/Deps.hs
• compiler/GHC/Unit/Module/Env.hs
• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/Location.hs
• compiler/GHC/Unit/Module/ModGuts.hs
• compiler/GHC/Unit/Module/ModIface.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/State.hs-boot
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/EndoOS.hs
• compiler/GHC/Utils/Error.hs
• − compiler/GHC/Utils/FV.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Misc.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Ppr/Colour.hs
• compiler/GHC/Utils/Trace.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/Doc.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/Module/Name.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• compiler/Language/Haskell/Syntax/Specificity.hs
• + compiler/Language/Haskell/Syntax/Text.hs
• compiler/Language/Haskell/Syntax/Type.hs
• − compiler/Language/Haskell/Syntax/Type.hs-boot
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• + docs/users_guide/10.2.1-notes.rst
• − docs/users_guide/9.16.1-notes.rst
• docs/users_guide/bugs.rst
• docs/users_guide/conf.py
• docs/users_guide/debug-info.rst
• docs/users_guide/debugging.rst
• docs/users_guide/eventlog-formats.rst
• docs/users_guide/expected-undocumented-flags.txt
• docs/users_guide/extending_ghc.rst
• docs/users_guide/exts/control.rst
• docs/users_guide/exts/explicit_namespaces.rst
• docs/users_guide/exts/linear_types.rst
• + docs/users_guide/exts/modifiers.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/static_pointers.rst
• docs/users_guide/exts/stolen_syntax.rst
• docs/users_guide/exts/strict.rst
• docs/users_guide/exts/syntax.rst
• docs/users_guide/exts/template_haskell.rst
• docs/users_guide/ghc_config.py.in
• − docs/users_guide/ghc_packages.py
• docs/users_guide/ghci.rst
• docs/users_guide/javascript.rst
• docs/users_guide/packages.rst
• docs/users_guide/phases.rst
• docs/users_guide/profiling.rst
• docs/users_guide/release-notes.rst
• docs/users_guide/runtime_control.rst
• docs/users_guide/using-optimisation.rst
• docs/users_guide/using-warnings.rst
• docs/users_guide/using.rst
• docs/users_guide/utils.py
• docs/users_guide/wasm.rst
• 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/Main.hs
• ghc/ghc-bin.cabal.in
• hadrian/README.md
• hadrian/bindist/Makefile
• hadrian/bindist/config.mk.in
• 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/build-cabal
• hadrian/build-cabal.bat
• hadrian/cabal.project
• hadrian/cfg/default.host.target.in
• hadrian/cfg/default.target.in
• + hadrian/cfg/system.config.host.in
• hadrian/cfg/system.config.in
• + hadrian/cfg/system.config.target.in
• hadrian/doc/flavours.md
• hadrian/doc/make.md
• hadrian/doc/testsuite.md
• hadrian/doc/user-settings.md
• hadrian/hadrian.cabal
• hadrian/src/Base.hs
• + hadrian/src/BindistConfig.hs
• hadrian/src/Builder.hs
• hadrian/src/CommandLine.hs
• hadrian/src/Context.hs
• hadrian/src/Expression.hs
• hadrian/src/Flavour.hs
• hadrian/src/Flavour/Type.hs
• hadrian/src/Hadrian/Builder.hs
• hadrian/src/Hadrian/Builder/Ar.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/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/Setting.hs
• hadrian/src/Oracles/TestSettings.hs
• hadrian/src/Packages.hs
• hadrian/src/Rules.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
• + hadrian/src/Rules/Changelog.hs
• hadrian/src/Rules/Compile.hs
• hadrian/src/Rules/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Gmp.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Nofib.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Register.hs
• hadrian/src/Rules/Rts.hs
• hadrian/src/Rules/SourceDist.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/Common.hs
• hadrian/src/Settings/Builders/Configure.hs
• hadrian/src/Settings/Builders/DeriveConstants.hs
• hadrian/src/Settings/Builders/GenPrimopCode.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Builders/Hsc2Hs.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
• libraries/array
• 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/Control/Exception.hs
• libraries/base/src/Control/Monad.hs
• libraries/base/src/Control/Monad/IO/Class.hs
• libraries/base/src/Control/Monad/Zip.hs
• libraries/base/src/Data/Array/Byte.hs
• libraries/base/src/Data/Bool.hs
• libraries/base/src/Data/Char.hs
• libraries/base/src/Data/Data.hs
• + libraries/base/src/Data/Double.hs
• libraries/base/src/Data/Eq.hs
• libraries/base/src/Data/Fixed.hs
• + libraries/base/src/Data/Float.hs
• libraries/base/src/Data/Functor/Classes.hs
• libraries/base/src/Data/Functor/Compose.hs
• libraries/base/src/Data/List.hs
• libraries/base/src/Data/List/NonEmpty.hs
• libraries/base/src/Data/List/NubOrdSet.hs
• libraries/base/src/Data/Semigroup.hs
• libraries/base/src/Data/Version.hs
• libraries/base/src/GHC/Base.hs
• libraries/base/src/GHC/ByteOrder.hs
• libraries/base/src/GHC/Conc.hs
• libraries/base/src/GHC/Conc/Sync.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/Fingerprint.hs
• libraries/base/src/GHC/IO/Handle.hs
• libraries/base/src/GHC/RTS/Flags.hs
• libraries/base/src/GHC/ResponseFile.hs
• libraries/base/src/GHC/Stack.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/Numeric.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/System/Environment.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/src/Text/Printf.hs
• libraries/base/src/Text/Read.hs
• libraries/base/tests/IO/T17912.hs
• libraries/base/tests/IO/T18832.hs
• libraries/base/tests/IO/all.T
• libraries/base/tests/T15349.stderr
• libraries/base/tests/all.T
• libraries/base/tests/enum01.stdout
• libraries/base/tests/enum01.stdout-alpha-dec-osf3
• libraries/base/tests/enum01.stdout-ws-64
• + libraries/base/tests/perf/ElemFusionUnknownList.hs
• + libraries/base/tests/perf/ElemFusionUnknownList_O1.stderr
• + libraries/base/tests/perf/ElemFusionUnknownList_O2.stderr
• + libraries/base/tests/perf/ElemNoFusion.hs
• + libraries/base/tests/perf/ElemNoFusion_O1.stderr
• + libraries/base/tests/perf/ElemNoFusion_O2.stderr
• libraries/base/tests/perf/T17752.hs
• − libraries/base/tests/perf/T17752.stdout
• + libraries/base/tests/perf/T17752_O1.stderr
• + libraries/base/tests/perf/T17752_O2.stderr
• libraries/base/tests/perf/all.T
• libraries/deepseq
• libraries/directory
• libraries/exceptions
• libraries/file-io
• libraries/filepath
• libraries/ghc-bignum/changelog.md
• libraries/ghc-bignum/ghc-bignum.cabal
• libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
• libraries/ghc-boot-th/ghc-boot-th.cabal.in
• + libraries/ghc-boot/GHC/Data/ShortByteString.hs
• libraries/ghc-boot/GHC/Data/ShortText.hs
• libraries/ghc-boot/GHC/Data/SizedSeq.hs
• compiler/GHC/Data/SmallArray.hs → libraries/ghc-boot/GHC/Data/SmallArray.hs
• libraries/ghc-boot/GHC/Settings/Utils.hs
• libraries/ghc-boot/GHC/Unit/Database.hs
• libraries/ghc-boot/ghc-boot.cabal.in
• libraries/ghc-compact/ghc-compact.cabal
• libraries/ghc-experimental/CHANGELOG.md
• libraries/ghc-experimental/ghc-experimental.cabal.in
• libraries/ghc-experimental/src/Data/Sum/Experimental.hs
• libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
• libraries/ghc-experimental/src/GHC/PrimOps.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/tests/Makefile
• libraries/base/src/GHC/Weak/Finalizehs → libraries/ghc-experimental/tests/all.T
• libraries/base/tests/perf/Makefile → 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-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
• libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
• + libraries/ghc-heap/tests/T27465.hs
• + libraries/ghc-heap/tests/T27465.stdout
• libraries/ghc-heap/tests/all.T
• libraries/ghc-heap/tests/tso_and_stack_closures.hs
• libraries/ghc-internal/CHANGELOG.md
• libraries/ghc-internal/bignum-backend.rst
• libraries/ghc-internal/cbits/Stack.cmm
• libraries/ghc-internal/codepages/MakeTable.hs
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/include/CTypes.h
• 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/Bignum/Backend.hs
• − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Check.hs
• − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/FFI.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
• − libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Selected.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.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/Char.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/Control/Monad/Zip.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/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/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/Natural.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/IO/OS.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/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/Types.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/T14532b.stdout
• + 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.stdout
• libraries/ghc-internal/tools/ucd2haskell/exe/UCD2Haskell/ModuleGenerators.hs
• libraries/ghc-prim/changelog.md
• libraries/ghc-prim/ghc-prim.cabal
• − libraries/ghci/GHCi/BinaryArray.hs
• + libraries/ghci/GHCi/Coverage.hs
• libraries/ghci/GHCi/CreateBCO.hs
• libraries/ghci/GHCi/Message.hs
• libraries/ghci/GHCi/ObjLink.hs
• libraries/ghci/GHCi/ResolvedBCO.hs
• libraries/ghci/GHCi/Run.hs
• libraries/ghci/GHCi/Server.hs
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• libraries/template-haskell-lift
• libraries/template-haskell-quasiquoter
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• libraries/unix
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• m4/fptools_set_platform_vars.m4
• m4/ghc_toolchain.m4
• m4/prep_target_file.m4
• nofib
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• rts/Capability.c
• rts/Capability.h
• rts/CloneStack.c
• rts/CloneStack.h
• rts/Continuation.c
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• rts/IPE.c
• rts/Interpreter.c
• rts/Linker.c
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• rts/ZeroSlop.c → rts/MarkSlop.c
• rts/Messages.c
• rts/PrimOps.cmm
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• rts/ProfHeap.c
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• rts/RaiseAsync.c
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• rts/linker/MachO.c
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• utils/check-exact/Main.hs
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• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
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• utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
• utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Json.hs
• utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
• utils/haddock/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
• utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
• utils/haddock/haddock-api/src/Haddock/Options.hs
• utils/haddock/haddock-api/src/Haddock/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/haddock-api/src/Haddock/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json/Types.hs
• utils/haddock/haddock-library/haddock-library.cabal
• utils/haddock/haddock-library/src/Documentation/Haddock/Doc.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Markup.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Parser.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Parser/Util.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Types.hs
• utils/haddock/haddock-library/test/Documentation/Haddock/ParserSpec.hs
• utils/haddock/haddock-test/haddock-test.cabal
• utils/haddock/haddock-test/src/Test/Haddock/Config.hs
• utils/haddock/haddock.cabal
• utils/haddock/html-test/ref/A.html
• utils/haddock/html-test/ref/Bug1004.html
• utils/haddock/html-test/ref/Bug1033.html
• utils/haddock/html-test/ref/Bug1103.html
• utils/haddock/html-test/ref/Bug548.html
• utils/haddock/html-test/ref/Bug923.html
• utils/haddock/html-test/ref/Bug973.html
• utils/haddock/html-test/ref/ConstructorPatternExport.html
• utils/haddock/html-test/ref/DefaultSignatures.html
• utils/haddock/html-test/ref/FunArgs.html
• utils/haddock/html-test/ref/Hash.html
• utils/haddock/html-test/ref/Instances.html
• utils/haddock/html-test/ref/LinearTypes.html
• utils/haddock/html-test/ref/PatternSyns.html
• utils/haddock/html-test/ref/PatternSyns2.html
• utils/haddock/html-test/ref/QuasiExpr.html
• utils/haddock/html-test/ref/RedactTypeSynonyms.html
• utils/haddock/html-test/ref/T23616.html
• utils/haddock/html-test/ref/Test.html
• utils/haddock/html-test/ref/TypeFamilies3.html
• utils/haddock/html-test/src/LinearTypes.hs
• utils/haddock/latex-test/src/LinearTypes/LinearTypes.hs
• utils/hsc2hs
• utils/jsffi/dyld.mjs
• utils/jsffi/prelude.mjs

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