Rodrigo Mesquita pushed to branch wip/romes/fix-pm-faststring at Glasgow Haskell Compiler / GHC

Commits:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add test for #26640
  

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

  Fix syntax error in gadt_syntax.rst

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Cmm: remove restriction in MachOp folding
  

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

  Remove explicit Typeable deriviations.
  

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

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

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

  Bump exceptions submodule to 0.10.11
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Doc: document -pgmi "" (#26634)
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Fix the documentation of `hIsClosed`
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Fix changelog formatting

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add regression test for #24867
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  iserv: add comment about -fkeep-cafs
  

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

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

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

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

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

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

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

  Add since annotation for Data.Bifoldable1
  
  Fixes #26432
  

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

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

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

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

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

  Remove `traceId` from ghc-pkg executable
  

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

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

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

  Upgrade mtl submodule to 2.3.2
  
  Fixes #26656
  

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

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

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

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

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

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

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

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

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

  Document when -maxN RTS option was added
  

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

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

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

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

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

  Bump toolchain in CI
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  testsuite: Widen acceptance window for T5205.
  
  Fixes #26782
  

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

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

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

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

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

  Update autoconf scripts
  
  Scripts taken from autoconf a2287c3041a3f2a204eb942e09c015eab00dc7dd
  

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

  CString.hs: Update incorrect comment.
  
  Fixes #26322
  

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

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

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

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

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

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

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

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

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

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

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

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

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

  RTS: Document -K behaviour better
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Remove blanket ignore that covers libraries/
  

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

  doc: update Flavour type in hadrian user-settings
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Export labelThread from Control.Concurrent
  

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

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

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

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

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

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

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

  Fix typo in roles.rst

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Upgrade text submodule to 2.1.4
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  driver: Hide source paths at verbosity level 1 by default
  

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

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

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

  Use Haddock formatting in deprecation message of `initNameCache`

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

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

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

  Bump transformers submodule to 0.6.3.0
  
  Fixes #26790
  

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

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

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

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

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

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

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

  libraries: bump Cabal submodule to 3.16.1.0
  

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

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

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

  libraries: bump directory submodule to 1.3.10.1
  

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

  libraries: bump exceptions submodule to 0.10.12
  

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

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

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

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

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

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

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

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

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

  Linker.MacOS reduce dynflags import
  

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

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

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

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

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

  Replace putstrln with logMsg in handleSeqHValueStatus
  
  Fixes #26549
  

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

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

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

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

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

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

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

  add Ghc.Data.Pair deriving
  

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

  Linker.MacOS reduce options import
  

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

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

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

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

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

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

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

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

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

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

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

  Remove unused Semigroup imports to fix GHC 9.14 bootstrapping
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  docs: Fix grammar in explicit_namespaces.rst
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Document `SemiClosedHandle`
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add regression test for #16122
  

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

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

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

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

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

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

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

  Add regression test for #15907
  
  Closes #15907.
  

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

  Ensure T14272 is run in optasm way
  
  Closes #16539.
  

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

  Add regression test for #24632
  
  Closes #24632.
  

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

  Fix module name of T9675: T6975 -> T9675
  

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

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

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

  Add regression test for #12694
  
  Closes #12694.
  

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

  Add regression test for #16275
  
  Closes #16275.
  

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

  Add regression test for #14908
  
  Closes #14908.
  

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

  Add regression test for #14151
  
  Closes #14151.
  

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

  Add regression test for #12640
  
  Closes #12640.
  

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

  Add regression test for #15588
  
  Closes #15588.
  

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

  Add regression test for #9445
  
  Closes #9445.
  

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

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

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

  Add perf test for #1216
  
  Closes #1216.
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Fix missing profiling header for origin_thunk frame.
  
  Fixes #27007
  

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

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

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

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

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

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

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

  Use explicit syntax rather than pure
  

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

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

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

  Fix typo in recursive_do.rst

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Move some functions related to pointer tagging to a separate module
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  ci: remove obsolete fallback for old debian and ubuntu versions
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add regression test for #13729
  
  Closes #13729.
  

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add regression test for #12002
  
  Closes #12002.
  

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

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

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

  Add regression test for #13180
  
  Closes #13180.
  

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

  Add regression test for #11141
  
  Closes #11141.
  

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

  Add regression test for #11505
  
  Closes #11505.
  

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

  Add regression perf test for #13820
  
  Closes #13820.
  

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

  Add regression test for #10381
  
  Closes #10381.
  

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

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

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

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

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

  release tracking: adopt release tracking ticket from #16816
  

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

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

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

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

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

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

• fdf828ae
  by Cheng Shao at 2026-03-26T03:57:03-04:00

  compiler: use `Binary` instance of `BCOByteArray` for bytecode objects
  
  This commit defines `Binary` (from `compiler`) instance of
  `BCOByteArray` which serializes the underlying buffer directly, and
  uses it directly in bytecode object serialization. Previously we reuse
  the `Binary` (from `binary`) instance, and this change allows us to
  avoid double-copying via an intermediate `ByteString` when using
  `put`/`get` in `binnary`. Also see added comment for explanation.
  

• 3bf62d0a
  by Cheng Shao at 2026-03-26T03:57:03-04:00

  ghci: use SmallArray directly in ResolvedBCO
  
  This patch makes ghci use `SmallArray` directly in `ResolvedBCO` when
  applicable, making the memory representation more compact and reducing
  marshaling overhead. Closes #27058.
  

• 3d6492ce
  by Wen Kokke at 2026-03-26T03:57:53-04:00

  Fix race condition between flushEventLog and start/endEventLogging.
  
  This commit changes `flushEventLog` to acquire/release the `state_change` mutex to prevent interleaving with `startEventLogging` and `endEventLogging`. In the current RTS, `flushEventLog` _does not_ acquire this mutex, which may lead to eventlog corruption on the following interleaving:
  
  - `startEventLogging` writes the new `EventLogWriter` to `event_log_writer`.
  - `flushEventLog` flushes some events to `event_log_writer`.
  - `startEventLogging` writes the eventlog header to `event_log_writer`.
  
  This causes the eventlog to be written out in an unreadable state, with one or more events preceding the eventlog header.
  
  This commit renames the old function to `flushEventLog_` and defines `flushEventLog` simply as:
  
  ```c
  void flushEventLog(Capability **cap USED_IF_THREADS)
  {
    ACQUIRE_LOCK(&state_change_mutex);
    flushEventLog_(cap);
    RELEASE_LOCK(&state_change_mutex);
  }
  ```
  
  The old function is still needed internally within the compilation unit, where it is used in `endEventLogging` in a context where the `state_change` mutex has already been acquired. I've chosen to mark `flushEventLog_` as static and let other uses of `flushEventLog` within the RTS refer to the new version. There is one use in `hs_init_ghc` via `flushTrace`, where the new locking behaviour should be harmless, and one use in `handle_tick`, which I believe was likely vulnerable to the same race condition, so the new locking behaviour is desirable.
  
  I have not added a test. The behaviour is highly non-deterministic and requires a program that concurrently calls `flushEventLog` and `startEventLogging`/`endEventLogging`. I encountered the issue while developing `eventlog-socket` and within that context have verified that my patch likely addresses the issue: a test that used to fail within the first dozen or so runs now has been running on repeat for several hours.
  

• 7b9a75f0
  by Phil Hazelden at 2026-03-26T03:58:37-04:00

  Fix build with werror on glibc 2.43.
  
  We've been defining `_XOPEN_SOURCE` and `_POSIX_C_SOURCE` to the same
  values as defined in glibc prior to 2.43. But in 2.43, glibc changes
  them to new values, which means we get a warning when redefining them.
  By `#undef`ing them first, we no longer get a warning.
  
  Closes #27076.
  

• fe6e76c5
  by Tobias Haslop at 2026-03-26T03:59:30-04:00

  Fix broken Haddock link to Bifunctor class in description of Functor class
  

• 404b71c1
  by Luite Stegeman at 2026-03-27T04:40:49-04:00

  Fix assert in Interpreter.c
  
  If we skip exactly the number of words on the stack we end up on
  the first word in the next chunk.
  

• a85bd503
  by Luite Stegeman at 2026-03-27T04:40:49-04:00

  Support arbitrary size unboxed tuples in bytecode
  
  This stores the size (number of words on the stack) of the next
  expected tuple in the TSO, ctoi_spill_size field, eliminating
  the need of stg_ctoi_tN frames for each size.
  
  Note: On 32 bit platform there is still a bytecode tuple size
  limit of 255 words on the stack.
  
  Fixes #26946
  

• e2209031
  by Luite Stegeman at 2026-03-27T04:40:49-04:00

  Add specialized frames for small tuples
  
  Small tuples are now returned more efficiently to the interpreter.
  They use one less word of stack space and don't need manipulation
  of the TSO anymore.
  

• b26bb2ea
  by VeryMilkyJoe at 2026-03-27T04:41:38-04:00

  Remove backwards compatibility pattern synonym `ModLocation`
  
  Fixes #24932
  

• 66e5e324
  by Vladislav Zavialov at 2026-03-27T04:42:25-04:00

  Extend HsExpr with the StarIsType syntax (#26587, #26967)
  
  This patch allows kinds of the form `k -> *` and `* -> k` to occur in
  expression syntax, i.e. to be used as required type arguments.
  
  For example:
  
  	{-# LANGUAGE RequiredTypeArguments, StarIsType #-}
  	x1 = f (* -> * -> *)
  	x2 = f (forall k. k -> *)
  	x3 = f ((* -> *) -> Constraint)
  
  Summary of the changes:
  
  * Introduce the HsStar constructor of HsExpr and its extension field XStar.
    It is analogous to HsStarTy in HsType.
  
  * Refactor HsStarTy to store the unicode flag as TokStar, defined as
      type TokStar = EpUniToken "*" "★"  -- similar to TokForall, TokRArrow, etc.
    The token is stored in the extension field and replaces the Bool field.
  
  * Extend the `infixexp2` nonterminal to parse `*` as a direct argument of `->`.
    This is more limited than the full StarIsType syntax, but has the nice
    property of not conflicting with the multiplication operator `a * b`.
  
  Test case: T26967 T26967_tyop
  

• f8de456f
  by Sylvain Henry at 2026-03-27T04:43:22-04:00

  STM: don't create a transaction in the rhs of catchRetry# (#26028)
  
  We don't need to create a transaction for the rhs of (catchRetry#)
  because contrary to the lhs we don't need to abort it on retry. Moreover
  it is particularly harmful if we have code such as (#26028):
  
    let cN = readTVar vN >> retry
        tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
    atomically tree
  
  Because it will stack transactions for the rhss and the read-sets of all
  the transactions will be iteratively merged in O(n^2) after the
  execution of the most nested retry.
  
  This is the second attempt at implementing this. The first attempt
  triggered segfaults (#26291) and has been reverted.
  
  Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
  

• fcf092dd
  by Luite Stegeman at 2026-03-27T04:44:17-04:00

  Windows: remove StgAsyncIOResult and fix crash/leaks
  
  In stg_block_async{_void}, a stack slot was reserved for
  an StgAsyncIOResult. This slot would be filled by the IO
  manager upon completion of the async call.
  
  However, if the blocked thread was interrupted by an async
  exception, we would end up in an invalid state:
  
   - If the blocked computation was never re-entered, the
     StgAsyncIOResult would never be freed.
   - If the blocked computation was re-entered, the thread would
     find an unitialized stack slot for the StgAsyncIOResult,
     leading to a crash reading its fields, or freeing the pointer.
  
  We fix this by removing the StgAsyncIOResult altogether and writing
  the result directly to the stack.
  
  Fixes #26341
  

• 05094993
  by Luite Stegeman at 2026-03-27T04:45:12-04:00

  Don't refine DEFAULT alt for unary typeclasses
  
  A non-DEFAULT data alt for a unary typeclass dictionary would
  interfere with Unary Class Magic, leading to segfaults.
  
  fixes #27071
  

• 4ee260cf
  by sheaf at 2026-03-27T04:46:06-04:00

  Fix several oversights in hsExprType
  
  This commit fixes several oversights in GHC.Hs.Syn.Type.hsExprType:
  
    - The 'RecordCon' case was returning the type of the constructor,
      instead of the constructor application. This is fixed by using
      'splitFunTys'.
    - The 'ExplicitTuple' case failed to take into account tuple sections,
      and was also incorrectly handling 1-tuples (e.g. 'Solo') which can
      be constructed using Template Haskell.
    - The 'NegApp' case was returning the type of the negation operator,
      again failing to apply it to the argument. Fixed by using
      'funResultTy'.
    - The 'HsProc' case was computing the result type of the arrow proc
      block, without taking into account the argument type. Fix that by
      adding a new field to 'CmdTopTc' that stores the arrow type, so that
      we can construct the correct result type `arr a b` for
      `proc (pat :: a) -> (cmd :: b)`.
    - The 'ArithSeq' and 'NegApp' cases were failing to take into account
      the result 'HsWrapper', which could e.g. silently drop casts.
      This is fixed by introducing 'syntaxExpr_wrappedFunResTy' which, on
      top of taking the result type, applies the result 'HsWrapper'.
  
  These fixes are validated by the new GHC API test T26910.
  
  Fixes #26910
  

• e97232ce
  by Hai at 2026-03-27T04:47:04-04:00

  Parser.y: avoid looking at token with QualifiedDo
  
  This changes the behavior of 'hintQualifiedDo' so that the supplied
  token is not inspected when the QualifiedDo language extension bit is
  set.
  

• 9831385b
  by Vladislav Zavialov at 2026-03-27T17:22:30-04:00

  Infix holes in types (#11107)
  
  This patch introduces several improvements that follow naturally from
  refactoring HsOpTy to represent the operator as an HsType, aligning it
  with the approach taken by OpApp and HsExpr.
  
  User-facing changes:
  
  1. Infix holes (t1 `_` t2) are now permitted in types, following the
     precedent set by term-level expressions.
  
     Test case: T11107
  
  2. Error messages for illegal promotion ticks are now reported at more
     precise source locations.
  
     Test case: T17865
  
  Internal changes:
  
  * The definition of HsOpTy now mirrors that of OpApp:
  
      | HsOpTy (XOpTy p)  (LHsType p) (LHsType p) (LHsType p)
      | OpApp  (XOpApp p) (LHsExpr p) (LHsExpr p) (LHsExpr p)
  
    This moves us one step closer to unifying HsType and HsExpr.
  
  * Ignoring locations,
      the old pattern match (HsOpTy x prom lhs op rhs)
      is now written as     (HsOpTy x lhs (HsTyVar x' prom op) rhs)
      but we also handle    (HsOpTy x lhs (HsWildCardTy x')    rhs)
  
    Constructors other than HsTyVar and HsWildCardTy never appear
    in the operator position.
  
  * The various definitions across the compiler have been updated to work
    with the new representation, drawing inspiration from the term-level
    pipeline where appropriate.  For example,
  
       ppr_infix_ty       <=> ppr_infix_expr
       get_tyop           <=> get_op
       lookupTypeFixityRn <=> lookupExprFixityRn
             (the latter is factored out from rnExpr)
  
  Test cases: T11107 T17865
  

• 5b6757d7
  by mangoiv at 2026-03-27T17:23:19-04:00

  ci: build i386 non-validate for deb12
  
  This is a small fix that will unlock ghcup metadata to run, i386 debian
  12 was missing as a job.
  

• cf942119
  by Cheng Shao at 2026-03-30T15:24:37-04:00

  ghc-boot: remove unused SizedSeq instances and functions
  
  This commit removes unused `SizedSeq` instances and functions, only
  keeping the bits we need for hpc tick sequence for now.
  

• 22c5b7cc
  by Cheng Shao at 2026-03-30T15:24:38-04:00

  ghci: remove unused GHCi.BinaryArray
  
  This patch removes the unused `GHCi.BinaryArray` module from `ghci`.
  Closes #27108.
  

• 77abb4ab
  by Cheng Shao at 2026-03-30T15:25:21-04:00

  testsuite: mark T17912 as fragile on Windows
  
  T17912 is still fragile on Windows, it sometimes unexpectedly pass in
  CI. This especially strains our already scarce Windows CI runner
  resources. Mark it as fragile on Windows for the time being.
  

• d741a6cc
  by Andreas Klebinger at 2026-03-31T04:39:33-04:00

  Bump minimum shake version for hadrian.
  
  We also add the shake version we want to stack.yaml
  
  Fixes #26884
  

• 5e556f9e
  by Vladislav Zavialov at 2026-03-31T04:40:16-04:00

  Status check for the HsType~HsExpr refactoring (#25121)
  
  Add a test case to track the status of a refactoring project within GHC
  whose goal is to arrive at the following declaration:
  
  	type HsType = HsExpr
  
  The rationale for this is to increase code reuse between the term- and
  type-level code in the compiler front-end (AST, parser, renamer, type checker).
  
  The status report is saved to testsuite/tests/ghc-api/T25121_status.stdout
  and provides useful insights into what needs to happen to make progress on
  the ticket.
  

• acffb1b1
  by fendor at 2026-03-31T04:41:02-04:00

  Extract Binary instances to `GHC.ByteCode.Binary`
  

• e2ea8e25
  by fendor at 2026-03-31T04:41:02-04:00

  Add `seqNonEmpty` for evaluating `NonEmpty a`
  

• 048b00b7
  by fendor at 2026-03-31T04:41:02-04:00

  Record `LinkableUsage` instead of `Linkable` in `LoaderState`
  
  Retaining a ByteCode `Linkable` after it has been loaded retains its
  `UnlinkedBCO`, keeping it alive for the remainder of the program.
  This starts accumulating a lot of `UnlinkedBCO` and memory over time.
  However, the `Linkable` is merely used to later record its usage in
  `mkObjectUsage`, which  is used for recompilation checking.
  
  However, this is incorrect, as the interface file and bytecode objects
  could be in different states, e.g. the interface changes, but the
  bytecode library hasn't changed so we don't need to recompile and vice
  versa.
  
  By computing a `Fingerprint` for the `ModuleByteCode`, and recording it
  in the `LinkableUsage`, we know precisely whether the `ByteCode` object
  on disk is outdated.
  
  Thus, parts of this commit just makes sure that we efficiently compute a
  `Fingerprint` for `ModuleByteCode` and store it in the on-disk
  representation of `ModuleByteCode`.
  
  We change the `LoaderState` to retain `LinkableUsage`, which is smaller
  representation of a `Linkable`. This allows us to free the unneeded
  fields of `Linkable` after linking them.
  
  We declare the following memory invariants that this commit implements:
  
  * No `LinkablePart` should be retained from `LoaderState`.
  * `Linkable`s should be unloaded after they have been loaded.
  
  These invariants are unfortunately tricky to automatically uphold, so we
  are simply documenting our assumptions for now.
  
  We introduce the `linkable-space` test which makes sure that after
  loading, no `DotGBC` or `UnlinkedBCO` is retained.
  
  -------------------------
  Metric Increase:
      MultiLayerModulesTH_OneShot
  -------------------------
  
  We allocate a bit more, but the peak number of bytes doesn't change.
  While a bit unfortunate, accepting the metric increase.
  
  We add multiple new performance measurements where we were able to
  observe the desired memory invariants. Further, we add regression tests
  to validate that the recompilation checker behaves more correct than
  before.
  

• 2d1c1997
  by Simon Jakobi at 2026-03-31T04:41:46-04:00

  Eliminate dictionary-passing in ListMap operations
  
  Mark the ListMap helpers 'INLINABLE' so importing modules can specialise
  the 'TrieMap (ListMap m)' methods and avoid recursive dictionary-passing.
  
  See Note [Making ListMap operations specialisable].
  
  Fixes #27097
  

• ed2c6570
  by Cheng Shao at 2026-03-31T04:42:33-04:00

  testsuite: fix testdir cleanup logic on Windows
  
  testdir cleanup is unreliable on Windows (#13162) and despite existing
  hacks in the driver, new failure mode has occurred. This patch makes
  it print the warning and carry on when failed to clean up a testdir,
  instead of reporting a spurious framework failure. See added comment
  for detailed explanation.
  

• d9388e29
  by Simon Jakobi at 2026-03-31T13:14:59-04:00

  Add regression test for #18177
  
  Closes #18177.
  
  Assisted-by: Codex
  

• 6a10045c
  by mangoiv at 2026-03-31T13:15:43-04:00

  ci: allow metric decrease for two tests on i386
  
  There has been a nightly failure on i386 due to a compiler runtime
  improvement on i386 debian 12. We allow that.
  
  Metric Decrease (test_env='i386-linux-deb12'):
    T12707 T8095
  

• 7fbb4fcb
  by Rodrigo Mesquita at 2026-04-01T12:16:33+00:00

  Bump default language edition to GHC2024
  
  As per the accepted ghc-proposal#632
  
  Fixes #26039
  

• 5ae43275
  by Peng Fan at 2026-04-01T19:01:06-04:00

  NCG/LA64: add cmpxchg and xchg primops
  
  And append some new instructions for LA664 uarch.
  
  Apply fix to cmpxchg-prim by Andreas Klebinger.
  
  Suggestions in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15515
  

• 8f95534a
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  Remove signal-based ticker implementations
  
  Fixes issue #27073
  
  All supported platforms should work with the pthreads + nanosleep based
  ticker implementation. This avoids all the problems with using signals.
  
  In practice, all supported platforms were probably using the non-signal
  tickers already, which is probably why we do not get lots of reports
  about deadlocks and other weirdness: we were definately using functions
  that are not async signal safe in the tick handler (such as fflush to
  flussh the eventlog).
  
  Only Solaris was explicitly using the timer_create ticker impl, and even
  Solaris could probably use the pthreads one (if anyone cared: Solaris is
  no longer a Teir 3 supported platform).
  
  Plausibly the only supported platform that this will change will be AIX,
  which should now use the pthreads impl.
  

• 51b32b0d
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  Tidy up some timer/ticker comments elsewhere
  

• 7562bcd7
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  Remove now-unused install_vtalrm_handler
  
  Support function used by both of the signal-based ticker
  implementations.
  

• 6da127c7
  by Duncan Coutts at 2026-04-01T19:01:52-04:00

  No longer probe for timer_create in rts/configure
  
  It was only used by the TimerCreate.c ticker impl.
  

• 3fd490fa
  by Duncan Coutts at 2026-04-01T19:01:53-04:00

  Note that rtsTimerSignal is deprecated.
  

• 63099b0f
  by Simon Jakobi at 2026-04-01T19:02:39-04:00

  Add perf test for #13960
  
  Closes #13960.
  

• 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.
  

• d0aeabf9
  by Rodrigo Mesquita at 2026-06-17T15:51:48+01:00

  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`.
  

2982 changed files:

• .gitattributes
• .gitignore
• .gitlab-ci.yml
• .gitlab/ci.sh
• .gitlab/darwin/nix/sources.json
• .gitlab/darwin/toolchain.nix
• + .gitlab/generate-ci/cabal.project
• .gitlab/generate-ci/flake.lock
• .gitlab/generate-ci/gen_ci.hs
• .gitlab/issue_templates/default.md
• + .gitlab/issue_templates/get-verified.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
• CODEOWNERS
• boot
• cabal.project-reinstall
• + changelog.d/T15973
• + changelog.d/T17833
• + changelog.d/T19174.md
• + changelog.d/T25636
• + changelog.d/T26978
• + changelog.d/T26979
• + changelog.d/T27022
• + changelog.d/T27046
• + changelog.d/T27047
• + changelog.d/T27121.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/T27317
• + changelog.d/T27359
• + 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-blackhole-handling
• + changelog.d/fix-duplicate-pmc-warnings
• + changelog.d/fix-finalizers-27072
• + changelog.d/fix-ghci-duplicate-warnings-26233
• + changelog.d/fix-plugin-finder-multi-home-unit.md
• + 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/ipe-event-class
• + changelog.d/jobserver-leak-fix
• + 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/remove-bignum-check-backend
• + changelog.d/remove-bignum-ffi-backend
• + 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/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/wasm-fix-serviceworker
• + changelog.d/windows-rethrow-overlapped-exception
• + changelog.d/withTcPlugins.md
• compiler/.hlint.yaml
• compiler/CodeGen.Platform.h
• compiler/GHC.hs
• compiler/GHC/Builtin/Names.hs
• compiler/GHC/Builtin/Names/TH.hs
• compiler/GHC/Builtin/PrimOps.hs
• compiler/GHC/Builtin/PrimOps/Ids.hs
• compiler/GHC/Builtin/Types.hs
• compiler/GHC/Builtin/Types/Literals.hs
• compiler/GHC/Builtin/Utils.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• + compiler/GHC/ByteCode/Binary.hs
• compiler/GHC/ByteCode/Breakpoints.hs
• compiler/GHC/ByteCode/InfoTable.hs
• compiler/GHC/ByteCode/Instr.hs
• compiler/GHC/ByteCode/Linker.hs
• + compiler/GHC/ByteCode/Recomp/Binary.hs
• compiler/GHC/ByteCode/Serialize.hs
• compiler/GHC/ByteCode/Types.hs
• compiler/GHC/Cmm.hs
• compiler/GHC/Cmm/BlockId.hs
• compiler/GHC/Cmm/CLabel.hs
• compiler/GHC/Cmm/CommonBlockElim.hs
• compiler/GHC/Cmm/Config.hs
• compiler/GHC/Cmm/ContFlowOpt.hs
• compiler/GHC/Cmm/Dataflow.hs
• compiler/GHC/Cmm/Dataflow/Block.hs
• compiler/GHC/Cmm/Dataflow/Graph.hs
• compiler/GHC/Cmm/Dataflow/Label.hs
• compiler/GHC/Cmm/DebugBlock.hs
• compiler/GHC/Cmm/Dominators.hs
• compiler/GHC/Cmm/Expr.hs
• compiler/GHC/Cmm/Graph.hs
• compiler/GHC/Cmm/Info.hs
• compiler/GHC/Cmm/Info/Build.hs
• compiler/GHC/Cmm/InitFini.hs
• compiler/GHC/Cmm/LRegSet.hs
• compiler/GHC/Cmm/LayoutStack.hs
• compiler/GHC/Cmm/Lexer.x
• compiler/GHC/Cmm/Lint.hs
• compiler/GHC/Cmm/Liveness.hs
• compiler/GHC/Cmm/MachOp.hs
• compiler/GHC/Cmm/Node.hs
• compiler/GHC/Cmm/Opt.hs
• compiler/GHC/Cmm/Parser.y
• compiler/GHC/Cmm/ProcPoint.hs
• compiler/GHC/Cmm/Reducibility.hs
• compiler/GHC/Cmm/Reg.hs
• compiler/GHC/Cmm/Sink.hs
• compiler/GHC/Cmm/Switch.hs
• compiler/GHC/Cmm/Switch/Implement.hs
• compiler/GHC/Cmm/ThreadSanitizer.hs
• compiler/GHC/Cmm/Type.hs
• compiler/GHC/Cmm/UniqueRenamer.hs
• compiler/GHC/Cmm/Utils.hs
• compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
• compiler/GHC/CmmToAsm/AArch64/Instr.hs
• compiler/GHC/CmmToAsm/AArch64/Ppr.hs
• compiler/GHC/CmmToAsm/AArch64/Regs.hs
• compiler/GHC/CmmToAsm/BlockLayout.hs
• compiler/GHC/CmmToAsm/CFG.hs
• compiler/GHC/CmmToAsm/CPrim.hs
• compiler/GHC/CmmToAsm/Config.hs
• compiler/GHC/CmmToAsm/Dwarf/Types.hs
• compiler/GHC/CmmToAsm/Format.hs
• compiler/GHC/CmmToAsm/LA64/CodeGen.hs
• compiler/GHC/CmmToAsm/LA64/Instr.hs
• compiler/GHC/CmmToAsm/LA64/Ppr.hs
• compiler/GHC/CmmToAsm/LA64/Regs.hs
• compiler/GHC/CmmToAsm/Monad.hs
• compiler/GHC/CmmToAsm/PPC/CodeGen.hs
• compiler/GHC/CmmToAsm/PPC/Ppr.hs
• compiler/GHC/CmmToAsm/PPC/Regs.hs
• compiler/GHC/CmmToAsm/Ppr.hs
• compiler/GHC/CmmToAsm/RV64/CodeGen.hs
• compiler/GHC/CmmToAsm/RV64/Instr.hs
• compiler/GHC/CmmToAsm/RV64/Ppr.hs
• compiler/GHC/CmmToAsm/RV64/Regs.hs
• compiler/GHC/CmmToAsm/Reg/Graph.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Coalesce.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Spill.hs
• compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
• compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
• compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
• compiler/GHC/CmmToAsm/Reg/Linear.hs
• compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
• compiler/GHC/CmmToAsm/Reg/Linear/JoinToTargets.hs
• compiler/GHC/CmmToAsm/Reg/Linear/StackMap.hs
• compiler/GHC/CmmToAsm/Reg/Linear/State.hs
• compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
• compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
• compiler/GHC/CmmToAsm/Reg/Liveness.hs
• + compiler/GHC/CmmToAsm/Reg/Regs.hs
• compiler/GHC/CmmToAsm/Reg/Target.hs
• compiler/GHC/CmmToAsm/Wasm.hs
• compiler/GHC/CmmToAsm/Wasm/Asm.hs
• compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
• compiler/GHC/CmmToAsm/Wasm/Types.hs
• compiler/GHC/CmmToAsm/X86/CodeGen.hs
• compiler/GHC/CmmToAsm/X86/Instr.hs
• compiler/GHC/CmmToAsm/X86/Ppr.hs
• compiler/GHC/CmmToAsm/X86/Regs.hs
• compiler/GHC/CmmToC.hs
• compiler/GHC/CmmToLlvm.hs
• compiler/GHC/CmmToLlvm/Base.hs
• compiler/GHC/CmmToLlvm/CodeGen.hs
• compiler/GHC/CmmToLlvm/Config.hs
• compiler/GHC/CmmToLlvm/Data.hs
• compiler/GHC/CmmToLlvm/Mangler.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Coercion.hs
• compiler/GHC/Core/Coercion.hs-boot
• compiler/GHC/Core/Coercion/Axiom.hs
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/DataCon.hs
• compiler/GHC/Core/FVs.hs
• compiler/GHC/Core/FamInstEnv.hs
• compiler/GHC/Core/InstEnv.hs
• compiler/GHC/Core/LateCC/OverloadedCalls.hs
• compiler/GHC/Core/LateCC/TopLevelBinds.hs
• compiler/GHC/Core/Lint.hs
• compiler/GHC/Core/Lint/Interactive.hs
• + compiler/GHC/Core/Lint/SubstTypeLets.hs
• compiler/GHC/Core/Make.hs
• compiler/GHC/Core/Map/Expr.hs
• compiler/GHC/Core/Map/Type.hs
• compiler/GHC/Core/Multiplicity.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/CSE.hs
• compiler/GHC/Core/Opt/CallerCC.hs
• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/CprAnal.hs
• compiler/GHC/Core/Opt/DmdAnal.hs
• compiler/GHC/Core/Opt/FloatIn.hs
• compiler/GHC/Core/Opt/FloatOut.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/OccurAnal.hs
• compiler/GHC/Core/Opt/Pipeline.hs
• compiler/GHC/Core/Opt/Pipeline/Types.hs
• + compiler/GHC/Core/Opt/Range.hs
• compiler/GHC/Core/Opt/SetLevels.hs
• compiler/GHC/Core/Opt/Simplify.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/WorkWrap.hs
• compiler/GHC/Core/Opt/WorkWrap/Utils.hs
• compiler/GHC/Core/Ppr.hs
• compiler/GHC/Core/Predicate.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/Compare.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/TyCo/Tidy.hs
• compiler/GHC/Core/TyCon.hs
• compiler/GHC/Core/TyCon/Env.hs
• compiler/GHC/Core/TyCon/RecWalk.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Type.hs-boot
• compiler/GHC/Core/Unfold.hs
• compiler/GHC/Core/Unfold/Make.hs
• compiler/GHC/Core/Unify.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToIface.hs
• compiler/GHC/CoreToStg.hs
• compiler/GHC/CoreToStg/AddImplicitBinds.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/Bag.hs
• compiler/GHC/Data/FastString.hs
• compiler/GHC/Data/FastString/Env.hs
• compiler/GHC/Data/Graph/Collapse.hs
• compiler/GHC/Data/Graph/Color.hs
• compiler/GHC/Data/Graph/Directed.hs
• compiler/GHC/Data/List/Infinite.hs
• compiler/GHC/Data/List/NonEmpty.hs
• compiler/GHC/Data/List/SetOps.hs
• compiler/GHC/Data/Maybe.hs
• compiler/GHC/Data/Pair.hs
• compiler/GHC/Data/Stream.hs
• compiler/GHC/Data/Strict.hs
• compiler/GHC/Data/StringBuffer.hs
• compiler/GHC/Data/TrieMap.hs
• compiler/GHC/Data/Word64Map.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/CmdLine.hs
• compiler/GHC/Driver/CodeOutput.hs
• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/CmmToAsm.hs
• compiler/GHC/Driver/Config/CmmToLlvm.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Config/Core/Lint/Interactive.hs
• compiler/GHC/Driver/Config/Core/Opt/Simplify.hs
• compiler/GHC/Driver/Config/Interpreter.hs
• compiler/GHC/Driver/Config/StgToCmm.hs
• compiler/GHC/Driver/Config/Tidy.hs
• compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env.hs
• compiler/GHC/Driver/Env/KnotVars.hs
• compiler/GHC/Driver/Env/Types.hs
• compiler/GHC/Driver/Errors.hs
• compiler/GHC/Driver/Errors/Ppr.hs
• compiler/GHC/Driver/Errors/Types.hs
• compiler/GHC/Driver/Flags.hs
• compiler/GHC/Driver/GenerateCgIPEStub.hs
• compiler/GHC/Driver/Hooks.hs
• compiler/GHC/Driver/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/MakeFile.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/LogQueue.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/Inspect.hs
• compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs.hs
• compiler/GHC/Hs/Basic.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• + compiler/GHC/Hs/Decls/Overlap.hs
• compiler/GHC/Hs/Doc.hs
• compiler/GHC/Hs/Doc.hs-boot
• compiler/GHC/Hs/DocString.hs
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Expr.hs-boot
• compiler/GHC/Hs/Extension.hs
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Instances.hs
• compiler/GHC/Hs/Lit.hs
• compiler/GHC/Hs/Pat.hs
• compiler/GHC/Hs/Pat.hs-boot
• compiler/GHC/Hs/Stats.hs
• compiler/GHC/Hs/Syn/Type.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Arrows.hs
• compiler/GHC/HsToCore/Binds.hs
• compiler/GHC/HsToCore/Breakpoints.hs
• compiler/GHC/HsToCore/Coverage.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Errors/Ppr.hs
• compiler/GHC/HsToCore/Errors/Types.hs
• compiler/GHC/HsToCore/Expr.hs
• compiler/GHC/HsToCore/Foreign/C.hs
• compiler/GHC/HsToCore/Foreign/Call.hs
• compiler/GHC/HsToCore/Foreign/Decl.hs
• compiler/GHC/HsToCore/Foreign/JavaScript.hs
• compiler/GHC/HsToCore/Foreign/Utils.hs
• compiler/GHC/HsToCore/Foreign/Wasm.hs
• compiler/GHC/HsToCore/GuardedRHSs.hs
• compiler/GHC/HsToCore/ListComp.hs
• compiler/GHC/HsToCore/Match.hs
• compiler/GHC/HsToCore/Match/Literal.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc.hs
• compiler/GHC/HsToCore/Pmc/Check.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/Pmc/Types.hs
• compiler/GHC/HsToCore/Pmc/Utils.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/HsToCore/Utils.hs
• compiler/GHC/Iface/Binary.hs
• compiler/GHC/Iface/Decl.hs
• compiler/GHC/Iface/Env.hs
• compiler/GHC/Iface/Errors.hs
• compiler/GHC/Iface/Errors/Ppr.hs
• compiler/GHC/Iface/Errors/Types.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Debug.hs
• compiler/GHC/Iface/Ext/Types.hs
• compiler/GHC/Iface/Ext/Utils.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Make.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/Recomp/Types.hs
• compiler/GHC/Iface/Rename.hs
• compiler/GHC/Iface/Syntax.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Tidy/StaticPtrTable.hs
• compiler/GHC/Iface/Type.hs
• compiler/GHC/Iface/Warnings.hs
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/JS/Ident.hs
• compiler/GHC/JS/JStg/Monad.hs
• compiler/GHC/JS/JStg/Syntax.hs
• compiler/GHC/JS/Make.hs
• compiler/GHC/JS/Optimizer.hs
• compiler/GHC/JS/Ppr.hs
• compiler/GHC/JS/Syntax.hs
• compiler/GHC/JS/Transform.hs
• + compiler/GHC/Linker/ByteCode.hs
• compiler/GHC/Linker/Deps.hs
• compiler/GHC/Linker/Dynamic.hs
• compiler/GHC/Linker/Executable.hs
• compiler/GHC/Linker/Loader.hs
• compiler/GHC/Linker/MacOS.hs
• compiler/GHC/Linker/Types.hs
• compiler/GHC/Linker/Unit.hs
• compiler/GHC/Llvm/MetaData.hs
• compiler/GHC/Llvm/Ppr.hs
• compiler/GHC/Llvm/Types.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/Errors/Basic.hs
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/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/Reg/Class.hs
• compiler/GHC/Platform/Reg/Class/NoVectors.hs
• compiler/GHC/Platform/Reg/Class/Separate.hs
• compiler/GHC/Platform/Reg/Class/Unified.hs
• + compiler/GHC/Platform/Tag.hs
• compiler/GHC/Prelude/Basic.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.hs
• compiler/GHC/Rename/Expr.hs-boot
• compiler/GHC/Rename/Fixity.hs
• compiler/GHC/Rename/HsType.hs
• + compiler/GHC/Rename/Lit.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Pat.hs
• compiler/GHC/Rename/Splice.hs
• compiler/GHC/Rename/Splice.hs-boot
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/Rename/Utils.hs
• compiler/GHC/Runtime/Debugger.hs
• compiler/GHC/Runtime/Debugger/Breakpoints.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Heap/Layout.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Interpreter/C.hs
• compiler/GHC/Runtime/Interpreter/Init.hs
• compiler/GHC/Runtime/Interpreter/JS.hs
• compiler/GHC/Runtime/Interpreter/Process.hs
• compiler/GHC/Runtime/Interpreter/Types.hs
• compiler/GHC/Runtime/Interpreter/Types/SymbolCache.hs
• compiler/GHC/Runtime/Interpreter/Wasm.hs
• compiler/GHC/Runtime/Loader.hs
• compiler/GHC/Settings.hs
• compiler/GHC/Settings/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/FVs.hs
• compiler/GHC/Stg/Lift/Analysis.hs
• compiler/GHC/Stg/Lift/Monad.hs
• compiler/GHC/Stg/Lift/Types.hs
• compiler/GHC/Stg/Lint.hs
• compiler/GHC/Stg/Pipeline.hs
• compiler/GHC/Stg/Syntax.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/Stg/Utils.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm.hs
• compiler/GHC/StgToCmm/ArgRep.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/CgUtils.hs
• compiler/GHC/StgToCmm/Closure.hs
• compiler/GHC/StgToCmm/DataCon.hs
• compiler/GHC/StgToCmm/Env.hs
• compiler/GHC/StgToCmm/Expr.hs
• compiler/GHC/StgToCmm/ExtCode.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/Monad.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/Prof.hs
• compiler/GHC/StgToCmm/Ticky.hs
• compiler/GHC/StgToCmm/Utils.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/Arg.hs
• compiler/GHC/StgToJS/CodeGen.hs
• compiler/GHC/StgToJS/DataCon.hs
• compiler/GHC/StgToJS/Deps.hs
• compiler/GHC/StgToJS/Expr.hs
• compiler/GHC/StgToJS/ExprCtx.hs
• compiler/GHC/StgToJS/FFI.hs
• compiler/GHC/StgToJS/Heap.hs
• compiler/GHC/StgToJS/Ids.hs
• compiler/GHC/StgToJS/Linker/Linker.hs
• compiler/GHC/StgToJS/Linker/Opt.hs
• compiler/GHC/StgToJS/Linker/Types.hs
• compiler/GHC/StgToJS/Linker/Utils.hs
• compiler/GHC/StgToJS/Literal.hs
• compiler/GHC/StgToJS/Monad.hs
• compiler/GHC/StgToJS/Object.hs
• compiler/GHC/StgToJS/Prim.hs
• compiler/GHC/StgToJS/Rts/Rts.hs
• compiler/GHC/StgToJS/Rts/Types.hs
• compiler/GHC/StgToJS/Sinker/Collect.hs
• compiler/GHC/StgToJS/Sinker/Sinker.hs
• compiler/GHC/StgToJS/Sinker/StringsUnfloat.hs
• compiler/GHC/StgToJS/Types.hs
• compiler/GHC/StgToJS/Utils.hs
• compiler/GHC/SysTools.hs
• compiler/GHC/SysTools/Ar.hs
• compiler/GHC/SysTools/BaseDir.hs
• compiler/GHC/SysTools/Cpp.hs
• compiler/GHC/SysTools/Process.hs
• compiler/GHC/SysTools/Tasks.hs
• compiler/GHC/SysTools/Terminal.hs
• compiler/GHC/Tc/Deriv.hs
• compiler/GHC/Tc/Deriv/Functor.hs
• compiler/GHC/Tc/Deriv/Generate.hs
• compiler/GHC/Tc/Deriv/Generics.hs
• compiler/GHC/Tc/Deriv/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/Hole/Plugin.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Errors/Types/PromotionErr.hs
• compiler/GHC/Tc/Gen/Annotation.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Arrow.hs
• compiler/GHC/Tc/Gen/Bind.hs
• compiler/GHC/Tc/Gen/Default.hs
• compiler/GHC/Tc/Gen/Do.hs
• + compiler/GHC/Tc/Gen/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/Instance/Class.hs
• compiler/GHC/Tc/Instance/Family.hs
• compiler/GHC/Tc/Instance/FunDeps.hs
• compiler/GHC/Tc/Instance/Typeable.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Solver.hs
• compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Dict.hs
• compiler/GHC/Tc/Solver/Equality.hs
• compiler/GHC/Tc/Solver/FunDeps.hs
• compiler/GHC/Tc/Solver/InertSet.hs
• compiler/GHC/Tc/Solver/Irred.hs
• compiler/GHC/Tc/Solver/Monad.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/Solver/Solve.hs
• compiler/GHC/Tc/Solver/Types.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/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/Utils/Backpack.hs
• compiler/GHC/Tc/Utils/Env.hs
• compiler/GHC/Tc/Utils/Instantiate.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• − compiler/GHC/Tc/Utils/TcMType.hs-boot
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/TcType.hs-boot
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/Monad.hs
• compiler/GHC/Tc/Zonk/TcType.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Annotations.hs
• + compiler/GHC/Types/Arity.hs
• compiler/GHC/Types/Avail.hs
• compiler/GHC/Types/Basic.hs
• compiler/GHC/Types/CompleteMatch.hs
• compiler/GHC/Types/CostCentre.hs
• compiler/GHC/Types/CostCentre/State.hs
• compiler/GHC/Types/DefaultEnv.hs
• compiler/GHC/Types/Demand.hs
• compiler/GHC/Types/Error.hs
• + compiler/GHC/Types/Error.hs-boot
• 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.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/SaneDouble.hs
• compiler/GHC/Types/SourceText.hs
• compiler/GHC/Types/SrcLoc.hs
• compiler/GHC/Types/Tickish.hs
• compiler/GHC/Types/TyThing.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/Unique/DFM.hs
• compiler/GHC/Types/Unique/DSet.hs
• compiler/GHC/Types/Unique/FM.hs
• compiler/GHC/Types/Unique/Map.hs
• compiler/GHC/Types/Unique/SDFM.hs
• compiler/GHC/Types/Unique/Set.hs
• compiler/GHC/Types/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/Finder.hs
• compiler/GHC/Unit/Home/Graph.hs
• compiler/GHC/Unit/Home/ModInfo.hs
• compiler/GHC/Unit/Home/PackageTable.hs
• compiler/GHC/Unit/Info.hs
• compiler/GHC/Unit/Module.hs
• compiler/GHC/Unit/Module/Deps.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/ModSummary.hs
• compiler/GHC/Unit/Module/Status.hs
• compiler/GHC/Unit/Module/Warnings.hs
• compiler/GHC/Unit/Module/WholeCoreBindings.hs
• compiler/GHC/Unit/State.hs
• + compiler/GHC/Unit/State.hs-boot
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Unit/Types.hs-boot
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/Binary/Typeable.hs
• compiler/GHC/Utils/EndoOS.hs
• compiler/GHC/Utils/Error.hs
• compiler/GHC/Utils/Exception.hs
• − compiler/GHC/Utils/FV.hs
• compiler/GHC/Utils/Json.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Misc.hs
• compiler/GHC/Utils/Monad.hs
• compiler/GHC/Utils/Monad/Codensity.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Panic.hs
• compiler/GHC/Utils/Panic/Plain.hs
• compiler/GHC/Utils/Trace.hs
• compiler/GHC/Wasm/ControlFlow.hs
• compiler/GHC/Wasm/ControlFlow/FromCmm.hs
• compiler/Language/Haskell/Syntax.hs
• compiler/Language/Haskell/Syntax/Basic.hs
• compiler/Language/Haskell/Syntax/Binds.hs
• + compiler/Language/Haskell/Syntax/Binds/InlinePragma.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• + compiler/Language/Haskell/Syntax/Decls/Foreign.hs
• + compiler/Language/Haskell/Syntax/Decls/Overlap.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/Expr.hs-boot
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Lit.hs
• compiler/Language/Haskell/Syntax/Module/Name.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• compiler/Language/Haskell/Syntax/Pat.hs-boot
• compiler/Language/Haskell/Syntax/Type.hs
• compiler/ghc.cabal.in
• config.guess
• config.sub
• configure.ac
• distrib/configure.ac.in
• − docs/Makefile
• − docs/storage-mgt/Makefile
• + docs/users_guide/10.2.1-notes.rst
• − docs/users_guide/9.16.1-notes.rst
• − docs/users_guide/Makefile
• docs/users_guide/bugs.rst
• docs/users_guide/conf.py
• docs/users_guide/debug-info.rst
• docs/users_guide/eventlog-formats.rst
• docs/users_guide/extending_ghc.rst
• docs/users_guide/exts/control.rst
• docs/users_guide/exts/explicit_namespaces.rst
• docs/users_guide/exts/gadt_syntax.rst
• docs/users_guide/exts/linear_types.rst
• + docs/users_guide/exts/modifiers.rst
• docs/users_guide/exts/multiway_if.rst
• docs/users_guide/exts/pragmas.rst
• + docs/users_guide/exts/qualified_strings.rst
• docs/users_guide/exts/recursive_do.rst
• docs/users_guide/exts/required_type_arguments.rst
• docs/users_guide/exts/rewrite_rules.rst
• docs/users_guide/exts/roles.rst
• docs/users_guide/exts/stolen_syntax.rst
• docs/users_guide/exts/syntax.rst
• docs/users_guide/exts/table.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/index.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/rtd-theme/layout.html
• docs/users_guide/runtime_control.rst
• docs/users_guide/using-concurrent.rst
• docs/users_guide/using-optimisation.rst
• docs/users_guide/using-warnings.rst
• docs/users_guide/using.rst
• docs/users_guide/utils.py
• docs/users_guide/wasm.rst
• docs/users_guide/win32-dlls.rst
• − driver/Makefile
• − driver/ghc/Makefile
• − driver/ghci/Makefile
• driver/ghci/ghci.c
• − driver/haddock/Makefile
• driver/utils/cwrapper.c
• driver/utils/isMinTTY.c
• − driver/utils/merge_sections.ld
• − driver/utils/merge_sections_pe.ld
• ghc/GHC/Driver/Session/Lint.hs
• ghc/GHC/Driver/Session/Mode.hs
• ghc/GHCi/Leak.hs
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Exception.hs
• ghc/GHCi/UI/Info.hs
• ghc/GHCi/UI/Monad.hs
• ghc/Main.hs
• − ghc/Makefile
• ghc/ghc-bin.cabal.in
• hadrian/README.md
• hadrian/bindist/Makefile
• hadrian/bindist/cwrappers/cwrapper.c
• hadrian/bootstrap/generate_bootstrap_plans
• hadrian/bootstrap/plan-9_10_1.json
• hadrian/bootstrap/plan-9_10_2.json
• + hadrian/bootstrap/plan-9_10_3.json
• hadrian/bootstrap/plan-9_12_1.json
• hadrian/bootstrap/plan-9_12_2.json
• + hadrian/bootstrap/plan-9_14_1.json
• hadrian/bootstrap/plan-bootstrap-9_10_1.json
• hadrian/bootstrap/plan-bootstrap-9_10_2.json
• + hadrian/bootstrap/plan-bootstrap-9_10_3.json
• hadrian/bootstrap/plan-bootstrap-9_12_1.json
• hadrian/bootstrap/plan-bootstrap-9_12_2.json
• + hadrian/bootstrap/plan-bootstrap-9_14_1.json
• hadrian/build-cabal
• hadrian/build-cabal.bat
• hadrian/cabal.project
• hadrian/cfg/default.host.target.in
• hadrian/cfg/default.target.in
• hadrian/cfg/system.config.in
• hadrian/doc/flavours.md
• hadrian/doc/make.md
• hadrian/doc/testsuite.md
• hadrian/doc/user-settings.md
• hadrian/hadrian.cabal
• hadrian/src/Base.hs
• hadrian/src/Builder.hs
• hadrian/src/CommandLine.hs
• hadrian/src/Context.hs
• hadrian/src/Flavour.hs
• hadrian/src/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/ArgsHash.hs
• hadrian/src/Hadrian/Oracles/Cabal/Type.hs
• hadrian/src/Hadrian/Oracles/DirectoryContents.hs
• hadrian/src/Hadrian/Oracles/Path.hs
• hadrian/src/Hadrian/Oracles/TextFile.hs
• hadrian/src/Hadrian/Utilities.hs
• hadrian/src/Main.hs
• hadrian/src/Oracles/Flag.hs
• hadrian/src/Oracles/Flavour.hs
• hadrian/src/Oracles/ModuleFiles.hs
• hadrian/src/Oracles/Setting.hs
• hadrian/src/Packages.hs
• hadrian/src/Rules.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
• + hadrian/src/Rules/Changelog.hs
• hadrian/src/Rules/Compile.hs
• hadrian/src/Rules/Docspec.hs
• hadrian/src/Rules/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Gmp.hs
• − hadrian/src/Rules/Libffi.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Lint.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Register.hs
• hadrian/src/Rules/Rts.hs
• hadrian/src/Rules/SourceDist.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/Cc.hs
• hadrian/src/Settings/Builders/Configure.hs
• hadrian/src/Settings/Builders/GenPrimopCode.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Builders/Hsc2Hs.hs
• hadrian/src/Settings/Builders/Make.hs
• − hadrian/src/Settings/Builders/MergeObjects.hs
• hadrian/src/Settings/Builders/RunTest.hs
• hadrian/src/Settings/Builders/SplitSections.hs
• hadrian/src/Settings/Default.hs
• − hadrian/src/Settings/Flavours/Benchmark.hs
• hadrian/src/Settings/Flavours/Development.hs
• hadrian/src/Settings/Flavours/GhcInGhci.hs
• hadrian/src/Settings/Flavours/Performance.hs
• hadrian/src/Settings/Flavours/Quick.hs
• hadrian/src/Settings/Flavours/QuickCross.hs
• hadrian/src/Settings/Flavours/Quickest.hs
• hadrian/src/Settings/Flavours/Validate.hs
• hadrian/src/Settings/Packages.hs
• hadrian/src/Settings/Program.hs
• hadrian/stack.yaml
• − libffi-tarballs
• libraries/Cabal
• − libraries/Makefile
• 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/Data/Array/Byte.hs
• libraries/base/src/Data/Bifoldable1.hs
• libraries/base/src/Data/Bool.hs
• libraries/base/src/Data/Char.hs
• libraries/base/src/Data/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/Ix.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/Desugar.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/Fingerprint.hs
• libraries/base/src/GHC/IO/Handle.hs
• − libraries/base/src/GHC/JS/Prim/Internal/Build.hs
• libraries/base/src/GHC/Num.hs
• − libraries/base/src/GHC/Num/BigNat.hs
• − libraries/base/src/GHC/Num/Integer.hs
• − libraries/base/src/GHC/Num/Natural.hs
• libraries/base/src/GHC/RTS/Flags.hs
• libraries/base/src/GHC/ResponseFile.hs
• libraries/base/src/GHC/Stats.hs
• libraries/base/src/GHC/Unicode.hs
• libraries/base/src/GHC/Weak.hs
• libraries/base/src/GHC/Weak/Finalize.hs
• libraries/base/src/Numeric.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/System/CPUTime/Utils.hs
• libraries/base/src/System/Exit.hs
• libraries/base/src/System/IO.hs
• + libraries/base/src/System/IO/OS.hs
• libraries/base/src/System/Info.hs
• libraries/base/src/System/Mem/Weak.hs
• libraries/base/src/System/Timeout.hs
• libraries/base/src/Text/Printf.hs
• libraries/base/src/Text/Read.hs
• libraries/base/tests/IO/T12010/cbits/initWinSock.c
• libraries/base/tests/IO/T17912.hs
• libraries/base/tests/IO/T18832.hs
• libraries/base/tests/IO/all.T
• + libraries/base/tests/IO/osHandles001FileDescriptors.hs
• + libraries/base/tests/IO/osHandles001FileDescriptors.stdout
• + libraries/base/tests/IO/osHandles001WindowsHandles.hs
• + libraries/base/tests/IO/osHandles001WindowsHandles.stdout
• + libraries/base/tests/IO/osHandles002FileDescriptors.hs
• + libraries/base/tests/IO/osHandles002FileDescriptors.stderr
• + libraries/base/tests/IO/osHandles002FileDescriptors.stdin
• + libraries/base/tests/IO/osHandles002FileDescriptors.stdout
• + libraries/base/tests/IO/osHandles002WindowsHandles.hs
• + libraries/base/tests/IO/osHandles002WindowsHandles.stderr
• + libraries/base/tests/IO/osHandles002WindowsHandles.stdin
• + libraries/base/tests/IO/osHandles002WindowsHandles.stdout
• libraries/base/tests/T23454.stderr
• libraries/base/tests/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/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/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-compact/tests/all.T
• 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/Exception/Backtrace/Experimental.hs
• libraries/ghc-experimental/src/GHC/Profiling/Eras.hs
• libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs
• + libraries/ghc-experimental/src/GHC/Stack/Decode/Experimental.hs
• libraries/ghc-experimental/src/GHC/TypeNats/Experimental.hs
• + libraries/ghc-experimental/tests/Makefile
• libraries/base/src/GHC/Weak/Finalizehs → libraries/ghc-experimental/tests/all.T
• libraries/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/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/cbits/consUtils.c
• libraries/ghc-internal/codepages/MakeTable.hs
• libraries/ghc-internal/configure.ac
• libraries/ghc-internal/ghc-internal.buildinfo.in
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/include/CTypes.h
• libraries/ghc-internal/include/HsIntegerGmp.h.in
• libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
• libraries/ghc-internal/src/GHC/Internal/Arr.hs
• libraries/ghc-internal/src/GHC/Internal/Base.hs
• libraries/ghc-internal/src/GHC/Internal/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/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
• − libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs-boot
• libraries/ghc-internal/src/GHC/Internal/CString.hs
• libraries/ghc-internal/src/GHC/Internal/Char.hs
• libraries/ghc-internal/src/GHC/Internal/Classes.hs
• + libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
• libraries/ghc-internal/src/GHC/Internal/Clock.hsc
• libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
• − libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Conc/Windows.hs
• libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
• libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Concurrent/MVar.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fail.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fix.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/IO/Class.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Bits.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Bool.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Dynamic.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Either.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Eq.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Utils.hs
• libraries/ghc-internal/src/GHC/Internal/Data/IORef.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Ix.hs
• libraries/ghc-internal/src/GHC/Internal/Data/List.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
• libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Ord.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
• libraries/ghc-internal/src/GHC/Internal/Data/STRef.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Semigroup/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Data/String.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Coercion.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Equality.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Typeable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Unique.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
• − libraries/ghc-internal/src/GHC/Internal/Data/Version.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs
• libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Encoding/UTF8.hs
• libraries/ghc-internal/src/GHC/Internal/Enum.hs
• libraries/ghc-internal/src/GHC/Internal/Environment.hs
• libraries/ghc-internal/src/GHC/Internal/Err.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Array.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
• libraries/ghc-internal/src/GHC/Internal/Event/EPoll.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/IntVar.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Internal/Types.hs
• libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Manager.hs
• libraries/ghc-internal/src/GHC/Internal/Event/PSQ.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Poll.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Event/TimeOut.hs
• libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Unique.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/Clock.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/ConsoleEvent.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/FFI.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/ManagedThreadPool.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Backtrace.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Exception/Context.hs
• libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
• libraries/ghc-internal/src/GHC/Internal/ExecutionStack.hs
• libraries/ghc-internal/src/GHC/Internal/ExecutionStack/Internal.hsc
• libraries/ghc-internal/src/GHC/Internal/Exts.hs
• libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs
• libraries/ghc-internal/src/GHC/Internal/Fingerprint.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Fingerprint/Type.hs
• libraries/ghc-internal/src/GHC/Internal/Float.hs
• libraries/ghc-internal/src/GHC/Internal/Float/ConversionUtils.hs
• libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/ConstPtr.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/Error.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/String.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/String/Encoding.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/Types.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/ForeignPtr/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Alloc.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Array.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Error.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Pool.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Utils.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Ptr.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Storable.hs
• libraries/ghc-internal/src/GHC/Internal/ForeignPtr.hs
• libraries/ghc-internal/src/GHC/Internal/ForeignSrcLang.hs
• libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs
• libraries/ghc-internal/src/GHC/Internal/GHCi.hs
• libraries/ghc-internal/src/GHC/Internal/GHCi/Helpers.hs
• libraries/ghc-internal/src/GHC/Internal/Generics.hs
• libraries/ghc-internal/src/GHC/Internal/Heap/Closures.hs
• libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc
• libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable/Types.hsc
• libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc
• libraries/ghc-internal/src/GHC/Internal/Heap/ProfInfo/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Buffer.hs
• libraries/ghc-internal/src/GHC/Internal/IO/BufferedIO.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Device.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/API.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/CodePage/Table.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Failure.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Iconv.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Latin1.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF16.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF32.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Encoding/UTF8.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/FD.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Internals.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Flock.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/LinuxOFD.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/NoOp.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs
• − libraries/ghc-internal/src/GHC/Internal/IO/Handle/Text.hs-boot
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Types.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Handle/Windows.hs
• libraries/ghc-internal/src/GHC/Internal/IO/IOMode.hs
• libraries/ghc-internal/src/GHC/Internal/IO/SubSystem.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Unsafe.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Windows/Encoding.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
• libraries/ghc-internal/src/GHC/Internal/IOArray.hs
• libraries/ghc-internal/src/GHC/Internal/IORef.hs
• libraries/ghc-internal/src/GHC/Internal/InfoProv.hs
• libraries/ghc-internal/src/GHC/Internal/InfoProv/Types.hsc
• libraries/ghc-internal/src/GHC/Internal/Int.hs
• libraries/ghc-internal/src/GHC/Internal/IsList.hs
• libraries/ghc-internal/src/GHC/Internal/Ix.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Foreign/Callback.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Prim.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/JS/Prim/Internal/Build.hs
• libraries/ghc-internal/src/GHC/Internal/LanguageExtensions.hs
• libraries/ghc-internal/src/GHC/Internal/Lexeme.hs
• libraries/ghc-internal/src/GHC/Internal/List.hs
• libraries/ghc-internal/src/GHC/Internal/MVar.hs
• libraries/ghc-internal/src/GHC/Internal/Magic.hs
• libraries/ghc-internal/src/GHC/Internal/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/Mem.hs
• libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
• libraries/ghc-internal/src/GHC/Internal/System/Posix/Types.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs
• − libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs
• libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadP.hs
• libraries/ghc-internal/src/GHC/Internal/Text/ParserCombinators/ReadPrec.hs
• − libraries/ghc-internal/src/GHC/Internal/Text/Read.hs
• libraries/ghc-internal/src/GHC/Internal/Text/Read/Lex.hs
• libraries/ghc-internal/src/GHC/Internal/TopHandler.hs
• libraries/ghc-internal/src/GHC/Internal/Tuple.hs
• libraries/ghc-internal/src/GHC/Internal/TypeError.hs
• libraries/ghc-internal/src/GHC/Internal/TypeLits.hs
• libraries/ghc-internal/src/GHC/Internal/TypeLits/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/TypeNats.hs
• libraries/ghc-internal/src/GHC/Internal/TypeNats/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/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/T15395.hs
• + libraries/ghc-internal/tests/backtraces/T15395.stdout
• libraries/ghc-internal/tests/backtraces/all.T
• libraries/ghc-internal/tests/stack-annotation/all.T
• libraries/ghc-internal/tests/stack-annotation/ann_frame001.stdout
• libraries/ghc-internal/tests/stack-annotation/ann_frame002.stdout
• libraries/ghc-internal/tests/stack-annotation/ann_frame003.stdout
• libraries/ghc-internal/tests/stack-annotation/ann_frame004.stdout
• + libraries/ghc-internal/tests/stack-annotation/ann_frame005.hs
• + libraries/ghc-internal/tests/stack-annotation/ann_frame005.stdout
• libraries/ghc-internal/tools/ucd2haskell/exe/UCD2Haskell/ModuleGenerators.hs
• libraries/ghc-platform/src/GHC/Platform/ArchOS.hs
• libraries/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
• libraries/ghci/GHCi/TH.hs
• libraries/ghci/ghci.cabal.in
• libraries/haskeline
• libraries/hpc
• + libraries/libffi-clib
• libraries/mtl
• libraries/os-string
• libraries/parsec
• libraries/process
• libraries/semaphore-compat
• libraries/stm
• libraries/template-haskell-lift
• libraries/template-haskell-quasiquoter
• libraries/template-haskell/Language/Haskell/TH/Quote.hs
• libraries/template-haskell/Language/Haskell/TH/Syntax.hs
• libraries/template-haskell/template-haskell.cabal.in
• libraries/terminfo
• libraries/text
• libraries/transformers
• libraries/unix
• libraries/xhtml
• linters/lint-codes/LintCodes/Static.hs
• − linters/lint-codes/Makefile
• − linters/lint-notes/Makefile
• llvm-passes
• llvm-targets
• − m4/find_ghc_bootstrap_prog.m4
• m4/find_llvm_prog.m4
• − m4/fp_check_timer_create.m4
• m4/fp_cmm_cpp_cmd_with_args.m4
• − m4/fp_copy_shellvar.m4
• + m4/fp_linker_supports_verbatim.m4
• m4/fp_prog_cc_linker_target.m4
• − m4/fp_prog_ld_flag.m4
• − m4/fp_prog_sort.m4
• m4/fp_setup_project_version.m4
• m4/fp_setup_windows_toolchain.m4
• m4/fptools_ghc_version.m4
• m4/fptools_happy.m4
• m4/fptools_set_platform_vars.m4
• m4/ghc_select_file_extensions.m4
• m4/ghc_toolchain.m4
• m4/prep_target_file.m4
• mk/system-cxx-std-lib-1.0.conf.in
• − mk/win32-tarballs.md5sum
• nofib
• packages
• rts/.gitignore
• + rts/.ubsan-suppressions
• rts/AllocArray.c
• rts/AllocArray.h
• rts/Apply.cmm
• rts/Capability.c
• rts/CloneStack.c
• rts/CloneStack.h
• rts/ClosureTable.c
• rts/Compact.cmm
• rts/Continuation.c
• rts/ContinuationOps.cmm
• rts/Disassembler.c
• rts/Exception.cmm
• rts/Heap.c
• rts/HeapStackCheck.cmm
• rts/Hpc.c
• rts/IOManager.c
• rts/IOManager.h
• rts/IPE.c
• rts/Interpreter.c
• rts/Jumps.h
• rts/Linker.c
• rts/LinkerInternals.h
• − rts/Makefile
• rts/Messages.c
• rts/PrimOps.cmm
• rts/Printer.c
• rts/RaiseAsync.c
• rts/RtsFlags.c
• rts/RtsMessages.c
• rts/RtsSymbols.c
• rts/RtsSymbols.h
• rts/STM.c
• rts/STM.h
• rts/Schedule.c
• rts/Stats.c
• rts/StgCRun.c
• rts/StgMiscClosures.cmm
• rts/StgStartup.cmm
• rts/ThreadPaused.c
• rts/Threads.c
• rts/Threads.h
• rts/Timer.c
• rts/Trace.c
• rts/Trace.h
• rts/Updates.h
• rts/Weak.c
• rts/configure.ac
• rts/eventlog/EventLog.c
• rts/eventlog/EventLog.h
• rts/include/Cmm.h
• − rts/include/Makefile
• rts/include/Rts.h
• rts/include/RtsAPI.h
• rts/include/Stg.h
• rts/include/rts/Bytecodes.h
• rts/include/rts/Constants.h
• rts/include/rts/EventLogWriter.h
• rts/include/rts/Flags.h
• rts/include/rts/Messages.h
• rts/include/rts/OSThreads.h
• rts/include/rts/PosixSource.h
• rts/include/rts/Threads.h
• rts/include/rts/Timer.h
• rts/include/rts/ghc_ffi.h
• rts/include/rts/storage/ClosureMacros.h
• rts/include/rts/storage/Closures.h
• rts/include/rts/storage/TSO.h
• rts/include/stg/MiscClosures.h
• rts/include/stg/Prim.h
• rts/include/stg/SMP.h
• rts/include/stg/Ticky.h
• rts/include/stg/Types.h
• rts/js/arith.js
• rts/linker/Elf.c
• rts/linker/InitFini.c
• rts/linker/LoadArchive.c
• rts/linker/MachO.c
• rts/linker/PEi386.c
• + rts/posix/FdWakeup.c
• + rts/posix/FdWakeup.h
• rts/posix/Signals.c
• rts/posix/Signals.h
• rts/posix/Ticker.c
• − rts/posix/ticker/Pthread.c
• − rts/posix/ticker/Setitimer.c
• − rts/posix/ticker/TimerCreate.c
• − rts/posix/ticker/TimerFd.c
• rts/prim/atomic.c
• rts/prim/mulIntMayOflo.c
• rts/prim/vectorQuotRem.c
• rts/rts.buildinfo.in
• rts/rts.cabal
• rts/sm/BlockAlloc.c
• rts/sm/Evac.c
• rts/sm/Evac.h
• rts/sm/Evac_thr.c → rts/sm/Evac_par.c
• rts/sm/MBlock.c
• rts/sm/NonMoving.c
• rts/sm/Sanity.c
• rts/sm/Scav_thr.c → rts/sm/Scav_par.c
• rts/sm/Storage.c
• rts/win32/AsyncMIO.c
• rts/win32/AsyncMIO.h
• − rts/win32/libHSffi.def
• − rts/win32/libHSghc-internal.def
• + rts/win32/libHSghc-internal.def.in
• − rts/win32/libHSghc-prim.def
• testsuite/.gitignore
• testsuite/config/ghc
• + testsuite/driver/_elffile.py
• testsuite/driver/cpu_features.py
• − testsuite/driver/kill_extra_files.py
• testsuite/driver/perf_notes.py
• testsuite/driver/runtests.py
• testsuite/driver/testglobals.py
• testsuite/driver/testlib.py
• testsuite/driver/testutil.py
• testsuite/ghc-config/ghc-config.hs
• testsuite/mk/boilerplate.mk
• testsuite/mk/test.mk
• + testsuite/tests/MiniQuickCheck.hs
• testsuite/tests/ado/ado004.hs
• testsuite/tests/annotations/should_fail/annfail02.hs
• testsuite/tests/annotations/should_fail/annfail02.stderr
• testsuite/tests/annotations/should_run/all.T
• testsuite/tests/arityanal/should_compile/Arity01.stderr
• testsuite/tests/arityanal/should_compile/Arity05.stderr
• testsuite/tests/arityanal/should_compile/Arity08.stderr
• testsuite/tests/arityanal/should_compile/Arity11.stderr
• testsuite/tests/arityanal/should_compile/Arity14.stderr
• testsuite/tests/array/should_run/arr020.hs
• testsuite/tests/arrows/should_compile/T21301.stderr
• testsuite/tests/backpack/cabal/bkpcabal08/bkpcabal08.stdout
• + testsuite/tests/bytecode/T26640.hs
• + testsuite/tests/bytecode/T26640.script
• + testsuite/tests/bytecode/T26640.stdout
• + testsuite/tests/bytecode/T27001.hs
• + testsuite/tests/bytecode/T27001.stdout
• + testsuite/tests/bytecode/TLinkable/BCOTemplate.hs
• + testsuite/tests/bytecode/TLinkable/LinkableUsage01.stderr
• + testsuite/tests/bytecode/TLinkable/LinkableUsage02.stderr
• + testsuite/tests/bytecode/TLinkable/Makefile
• + testsuite/tests/bytecode/TLinkable/all.T
• + testsuite/tests/bytecode/TLinkable/genLinkables.sh
• + testsuite/tests/bytecode/TLinkable/linkable-space.hs
• + testsuite/tests/bytecode/TLinkable/linkable-space.stdout
• testsuite/tests/bytecode/all.T
• + testsuite/tests/bytecode/tuplestress/ByteCode.hs
• + testsuite/tests/bytecode/tuplestress/Common.hs-incl
• + testsuite/tests/bytecode/tuplestress/Obj.hs
• + testsuite/tests/bytecode/tuplestress/TupleStress.hs
• + testsuite/tests/bytecode/tuplestress/TupleStress.stdout
• + testsuite/tests/bytecode/tuplestress/all.T
• + testsuite/tests/cabal/Bytecode.hs
• + testsuite/tests/cabal/BytecodeForeign.c
• + testsuite/tests/cabal/BytecodeForeign.hs
• testsuite/tests/cabal/Makefile
• testsuite/tests/cabal/all.T
• + testsuite/tests/cabal/bytecode.pkg
• + testsuite/tests/cabal/bytecode.script
• + testsuite/tests/cabal/bytecode_foreign.pkg
• + testsuite/tests/cabal/bytecode_foreign.script
• testsuite/tests/cabal/ghcpkg03.stderr
• testsuite/tests/cabal/ghcpkg03.stderr-mingw32
• testsuite/tests/cabal/ghcpkg05.stderr
• testsuite/tests/cabal/ghcpkg05.stderr-mingw32
• + testsuite/tests/cabal/ghcpkg10.stdout
• + testsuite/tests/cabal/pkg_bytecode.stderr
• + testsuite/tests/cabal/pkg_bytecode.stdout
• + testsuite/tests/cabal/pkg_bytecode_foreign.stderr
• + testsuite/tests/cabal/pkg_bytecode_foreign.stdout
• + testsuite/tests/cabal/pkg_bytecode_with_gbc.stderr
• + testsuite/tests/cabal/pkg_bytecode_with_gbc.stdout
• + testsuite/tests/cabal/pkg_bytecode_with_o.stderr
• + testsuite/tests/cabal/pkg_bytecode_with_o.stdout
• + testsuite/tests/cmm/opt/T25664.hs
• + testsuite/tests/cmm/opt/T25664.stdout
• testsuite/tests/cmm/opt/all.T
• testsuite/tests/codeGen/should_compile/Makefile
• testsuite/tests/codeGen/should_compile/T25177.stderr
• + testsuite/tests/codeGen/should_compile/T25650.hs
• + testsuite/tests/codeGen/should_compile/T25650.stdout-ws-32
• + testsuite/tests/codeGen/should_compile/T25650.stdout-ws-64
• testsuite/tests/codeGen/should_compile/all.T
• testsuite/tests/codeGen/should_compile/debug.stdout
• + testsuite/tests/codeGen/should_fail/T26958.hs
• testsuite/tests/codeGen/should_fail/all.T
• + testsuite/tests/codeGen/should_gen_asm/aarch64-shl-subword.asm
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• testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs
• + utils/changelog-d/ChangelogD.hs
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• + utils/changelog-d/changelog-d.cabal
• utils/check-exact/ExactPrint.hs
• utils/check-exact/Main.hs
• utils/check-exact/Parsers.hs
• utils/check-exact/Transform.hs
• utils/check-exact/Utils.hs
• utils/deriveConstants/Main.hs
• utils/genapply/Main.hs
• utils/genprimopcode/Main.hs
• utils/ghc-pkg/Main.hs
• utils/ghc-pkg/ghc-pkg.cabal.in
• utils/ghc-toolchain/exe/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cc.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cpp.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Tools/Link.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Utils.hs
• utils/haddock/CONTRIBUTING.md
• utils/haddock/cabal.project
• utils/haddock/doc/.gitignore
• utils/haddock/doc/Makefile
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• utils/haddock/doc/conf.py
• utils/haddock/doc/markup.rst
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• utils/haddock/haddock-api/haddock-api.cabal
• utils/haddock/haddock-api/src/Haddock.hs
• − utils/haddock/haddock-api/src/Haddock/Backends/HaddockDB.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Renderer.hs
• utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/DocMarkup.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Layout.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Names.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Themes.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Convert.hs
• utils/haddock/haddock-api/src/Haddock/Doc.hs
• 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/LexParseRn.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
• utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
• utils/haddock/haddock-api/src/Haddock/Options.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/haddock-api/src/Haddock/Utils.hs
• utils/haddock/haddock-library/haddock-library.cabal
• utils/haddock/haddock-test/haddock-test.cabal
• utils/haddock/haddock.cabal
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• utils/haddock/html-test/ref/ConstructorPatternExport.html
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• utils/haddock/html-test/ref/Hash.html
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• utils/haddock/html-test/ref/LinearTypes.html
• utils/haddock/html-test/ref/Nesting.html
• utils/haddock/html-test/ref/PatternSyns.html
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• utils/haddock/html-test/ref/QuasiExpr.html
• utils/haddock/html-test/ref/RedactTypeSynonyms.html
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• utils/haddock/html-test/ref/TypeFamilies3.html
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• utils/haddock/html-test/ref/Unicode.html
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• utils/haddock/html-test/src/LinearTypes.hs
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• utils/haddock/latex-test/ref/LinearTypes/LinearTypes.tex
• utils/haddock/latex-test/src/LinearTypes/LinearTypes.hs
• utils/hsc2hs
• − utils/iserv/cbits/iservmain.c
• − utils/iserv/iserv.cabal.in
• − utils/iserv/src/Main.hs
• utils/jsffi/dyld.mjs
• utils/jsffi/post-link.mjs
• utils/jsffi/prelude.mjs

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