Simon Jakobi pushed to branch wip/sjakobi/T25450-march-native at Glasgow Haskell Compiler / GHC

Commits:

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

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

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

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

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

  fix typo : compete with performance, not complete

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

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

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

  Fix #27067 - Clarify haddocks on `minusNaturalMaybe`
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Don't use non-breaking spaces
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  haddock: render modules concurrently
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Hadrian: fix ghc-internal .def file name
  

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

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

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

  EPA: Use standard type family declaration for Anno
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  testsuite: Report fragile failures as skipped in JUnit output
  

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

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

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

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

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

  Encapsulate options of occurAnalysePgm in a record
  

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

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

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

  Address documentation feedback
  

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

  Keep the imp_rules parameter of occurPgmAnalysePgm and add occ_opts to OccEnv
  

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

  Strengthen T27240.hs with a binding that should be removed
  

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

  Move the reference #27240 to a related paragraph
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Monomorphising GHC pass parameters where appropriate
  

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

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

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

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

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

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

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

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

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

  gitlab-ci: Drop vestigial references to make build system
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  testsuite: Suppress unwanted optimizations on T25284
  

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

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

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

  testsuite: Mark memo001 broken on optimized ways
  
  See #27396
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  win32 ticker: split out local helper functions
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  testsuite: Keep real reason for fragile test failures
  

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

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

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

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

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

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

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

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

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

  [Fix #27287] preserve ModBreaks in ModIface
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add a FIXME note in the Poll I/O manager
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Use BlockInfoForceNonClosure in the select I/O manager
  

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

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

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

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

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

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

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

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

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

  Remove duplicate assertion
  

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

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

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

  Add a changelog entry
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  testsuite: exclude libnuma from mostly-static
  
  It needs static system libraries (libnuma.a) that many platforms do not
  ship.
  
  Fixes #26914
  

• bee1913d
  by Alan Zimmerman at 2026-07-28T16:42:29-04:00

  EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs
  
  Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit
  changes the as-parsed representation of class instance declarations to
  [LHsDecl GhcPs], and only separates them by type from the renamer onward.
  
  This also allows us to remove all the AnnSortKey machinery for exact
  printing, as it is now no longer needed.
  

• 72c55eee
  by Cheng Shao at 2026-07-28T16:43:11-04:00

  hadrian: implement and use writeFileAtomic to fix race condition
  
  This patch implements `writeFileAtomic` in hadrian and change all
  invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`,
  to avoid multiple hadrian concurrent invocations overwriting the same
  in-tree generated file not in the build root directory. Fixes #27536.
  Additional notes:
  
  - `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since
    it involves reading the file's older version, so their uses are left
    alone. It doesn't affect #27536 given their outputs are contained in
    the build root directory.
  - It's possible to shrink this patch by only making writes outside the
    build root directory atomic. But I think it's not worth the effort
    for fine grained distinction here, and atomic writes within the
    build root directory should also improve robustness of a hadrian
    build.
  - In the longer term we do want to make a ghc build only generate
    files within the build root directory, though that's a lot of work
    and outside the scope of this particular bugfix.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 46d4f963
  by Sylvain Henry at 2026-07-29T06:38:40-04:00

  RTS: correctly mark slop bytes when shrinking large arrays (#19048)
  
  Correctly mark slop bytes even when profiling is off so that heap census
  doesn't traverse garbage-collected closures.
  

• 4762a8bf
  by Simon Jakobi at 2026-07-29T06:39:23-04:00

  Add -XLazyFieldAnnotations (GHC proposal 752)
  
  Unbundle the prefix `~` lazy field annotation syntax from StrictData. The
  new LazyFieldAnnotations extension controls whether `~` is accepted on
  constructor fields. StrictData (and Strict, transitively) imply the new
  extension.
  
  See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-lazy-field-annotations.rst.
  
  Closes #24455.
  
  Assisted-by: Claude Opus 4.8
  

• 0b6dcc84
  by Simon Jakobi at 2026-07-29T06:40:04-04:00

  testsuite: Relax T24471 residency tolerance
  
  T24471 peak residency fluctuates enough on i386 to cause spurious
  failures. Use the standard residency tolerance while retaining the
  existing allocation threshold.
  
  See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• 90e95b34
  by Cheng Shao at 2026-07-29T06:40:45-04:00

  compiler: fix missing top-level procedure labels in cmm dumps
  
  This patch fixes missing top-level procedure labels in some
  intermediate Cmm pass dumps. Fixes #27553.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 360a5946
  by sheaf at 2026-07-29T06:41:35-04:00

  Add some type-family-heavy performance tests
  
  FamAppCachePerf stress-tests the performance of lookups in the
  type family application cache.
  
  T27336 is a minimisation extracted from the reported reproducer.
  
  SimplCastPerf is a measure of coercion growth due to the simplifier
  calling mkTransCo without re-optimising the result.
  

• 3ec9e2b9
  by Mike Pilgrem at 2026-07-31T08:21:33-04:00

  GHC Guide: Improve docs on response files
  

• e5b2a1f7
  by sheaf at 2026-07-31T08:22:23-04:00

  Disable Core Lint for TcPlugin_RewritePerf
  
  This is a compiler performance test, but the test source hard-coded
  -dcore-lint, defeating the measurement.
  
  -------------------------
  Metric Decrease:
      TcPlugin_RewritePerf
  -------------------------
  

• 85b10c00
  by Alan Zimmerman at 2026-07-31T22:09:47+01:00

  EPA: Remove LocatedP from OverlapMode
  
  We have
  
    type LocatedP = GenLocated SrcSpanAnnP
    type SrcSpanAnnP = EpAnn AnnPragma
  
  As the first step in removing this in favour of LocatedA which only
  captures location, comments and trailing annotations, we remove it
  from OverlapMode
  
  We do this by moving the AnnPragma into the TTG extension point
  instead.
  

• c9a34a00
  by Viktor Dukhovni at 2026-08-02T04:34:17-04:00

  Fix note typo
  

• 4f2a21f7
  by Andreas Klebinger at 2026-08-02T22:46:46-04:00

  Apply oneShot Monad trick to STG LintM
  

• 21e4b89d
  by Andreas Klebinger at 2026-08-02T22:46:46-04:00

  stgLint: Use a single reader env for read only arguments.
  

• d415f38a
  by Alan Zimmerman at 2026-08-02T22:47:27-04:00

  EPA: Remove LocatedP from CType
  
  The next step of removing use of LocatedP by moving
  the AnnPragma for CType into its TTG extension point
  instead.
  

• 8fc6f882
  by Simon Jakobi at 2026-08-05T14:53:41-04:00

  testsuite: Don't crash on non-UTF-8 test output
  
  read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded
  strictly (the first three with UTF-8, read_diff with the locale
  encoding), so a test emitting invalid UTF-8 (binary output, or a crash
  truncating a multi-byte character) raised UnicodeDecodeError and was
  reported as a framework failure instead of its actual result.
  
  Decode with errors='replace', like read_no_crs and safe_print.
  
  Assisted-by: Claude Fable 5
  

• 56534866
  by Simon Jakobi at 2026-08-05T14:53:41-04:00

  testsuite: Colorize the test summary, also in CI
  
  The summary headings were plain, and SUMMARY was colored unconditionally,
  so the escapes also ended up in the file written by --summary-file.
  Color is now decided per output sink via term_color.colored_if; see the
  comments in term_color.
  
  CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so
  add --force-colors and pass it in .gitlab/ci.sh.
  
  Assisted-by: Claude Opus 5
  

• bceb541a
  by Simon Jakobi at 2026-08-05T14:53:42-04:00

  testsuite: Repeat unexpected failure output in the summary
  
  Finding out why a test failed meant scrolling back through a possibly
  very long log to the point where the test ran. The summary now repeats
  the captured output of unexpected failures, before the statistics, so
  the most interesting part is at the end of the log (#16720).
  
  Output mismatches report their diff instead of the mismatching stream
  (see Note [Redundant output in test results]). The repeated output is
  bounded per stream, and skipped altogether beyond
  MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in
  several ways share one block.
  
  Test results now report a source-relative directory, stable regardless
  of where the run was started from.
  
  Assisted-by: Claude Fable 5
  

• 2ab02c57
  by Ben Gamari at 2026-08-05T14:54:24-04:00

  base: Don't drop exception context in SomeException(toException)
  
  For reasons that are lost to time, the implementation of [CLC #200]
  that was merged inappropriately dropped `ExceptionContext` in the
  `toException` implementation given to `SomeException`.
  
  Fix this infelicity.
  
  [CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200
  

• 126ce574
  by Vladislav Zavialov at 2026-08-05T14:55:05-04:00

  Test case for #20902
  
  Starting with GHC 9.14.1 (the first major release to include 51e3ec83),
  and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68
  and b30f25591e), all examples in this ticket are handled as expected.
  

• b14d8d59
  by Alan Zimmerman at 2026-08-05T14:55:46-04:00

  EPA: Remove LocatedP, last use in WarningTxt
  
  The last step of removing LocatedP, by moving the AnnPragma for
  WarningTxt into its TTG extension point instead.
  
  This also allows us to remove LocatedP and SrcSpanAnnP
  

• 70b58c8f
  by Vladislav Zavialov at 2026-08-05T14:56:27-04:00

  Test cases for #18725
  
  Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in
  this ticket no longer panics. A standalone kind signature breaks the recursive
  loop, so the type constructor can be used in a kind within its own group.
  
  T18725a checks that this is accepted with the signature present, while T18725b
  confirms it is still rejected without it.
  

• b18c8dd5
  by Zubin Duggal at 2026-08-06T15:51:01-04:00

  hie files: Dump the type table when dumping with -ddump-hie
  

• f839d0fb
  by Zubin Duggal at 2026-08-06T15:51:01-04:00

  hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast
  
  Fixes #25709
  

• 5753ebaa
  by Simon Jakobi at 2026-08-06T15:51:43-04:00

  testsuite: fix stale paths for the ghc-config build artifacts
  
  ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in
  6c7a49139c, but the .gitignore entry and the clean rule still referred to
  the old location. As a result the compiled ghc-config binary, which
  boilerplate.mk rebuilds on every make-driven test run, showed up as an
  untracked file and was never cleaned.
  
  Assisted-by: Claude Opus 5
  

• 246d4d72
  by Simon Peyton Jones at 2026-08-06T15:52:25-04:00

  Documentation only
  
  ...driven by my investigation of #27591
  

• be69e9df
  by Alan Zimmerman at 2026-08-06T15:53:05-04:00

  EPA: Replace AnnPragma with individual types
  
  We introduced AnnPragma as a common type for all pragma usages wrapped
  in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma
  moved into the TTG points for the given items, we can ensure that each
  carries only the annotations it needs.
  
  So we remove AnnPragma, and in its place bring in
    AnnCType
    AnnWarningTxt
    AnnOverlap
    AnnAnnDecl
    AnnPragSCC
  

• 0779e12c
  by Simon Jakobi at 2026-08-07T12:36:11-04:00

  Cmm: print unreachable blocks under -dppr-debug (#27368)
  
  Unreachable blocks linger in a CmmGraph's block map for most of the Cmm
  pipeline, but pprCmmGraph only ever printed the blocks reachable from the
  entry, so dumps looked consistent while the graph was not. Issues like
   #27368 were hard to debug due to this.
  
  pprCmmGraph now appends the stored-but-unreachable blocks under a
  "// unreachable blocks:" heading when -dppr-debug is on.
  See Note [unreachable blocks] in GHC.Cmm.Pipeline.
  
  Assisted-by: Claude Opus 5
  

• 3a0f9a51
  by Simon Peyton Jones at 2026-08-07T12:36:54-04:00

  Fix three bugs related to required type args and INLINE pragmas
  
  * `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front,
    leading to a Lint error (#27557)
  
  * The arity in an InlineSaturation is the VisArity not the Arity; the
    two can differ when we have "required" type arguments.  This made the
    INLINE pragma argument counting go wrong in `makeCorePair` (#27590).
  
  * When a simple binding has a type signature, we take special path in `tcPolyCheck`,
    leading to an outer `AbsBinds` that has no dictionaries, even when the binding
    is in fact overloaded.  That confused the inline-arity computation in
    `makeCorePair` (#27589).
  
  The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`.
  That actually simplifies the API of `makeCorePair`, which is nice.
  
  The first bug is fixed by swapping the visiblity flags in
  `GHC.Core.Opt.Arity.mkEtaForAllMCo`
  
  Getting the INLINE behaviour right led to some perf changes:
    * Runtime /halved/ on T7954 due to better specialisation
    * Compile time increased by 6% in T21839c because a bit more inlining
      happened, as it always should have done.
    * For some reason compile-time max-bytes-used dropped by 30% on
      T27336, but only on one build configuration; and it increased
      on LinkableUsage02 by 6% on another configuration
  
  Geometric mean effect on our compile time benchmarks is +0.1%.
  
  Metric Decrease:
      T27336
      T7954
  Metric Increase:
      LinkableUsage02
      T21839c
  

• 4f985108
  by Vladislav Zavialov at 2026-08-07T17:49:50-04:00

  Discard type arguments in tcPatToExpr (#27440, #27583)
  
  The builder expression of an implicitly bidirectional pattern synonym must not
  mention types written in the RHS:
  
    * Invisible type arguments led to a panic (#27440)
    * Required type arguments failed with out-of-scope variables (#27583)
  
  Both are now discarded, following the precedent established by pattern
  signatures (#9867).
  
  Discarding type arguments takes some care: a type pattern cannot be told from a
  value pattern by syntax alone, as the `type` keyword may be omitted. Consider:
  
      data T a b c where
        MkT :: forall a. forall b c -> a -> T a b c
  
      pattern P :: x -> T x y z
      pattern P x = MkT @a (type b) c x
  
  In P's right-hand side, `@a` and `type b` are clearly type arguments, but what
  about `c` and `x`? We can only tell by matching the patterns against MkT's
  type. So tcPatToExpr now runs in TcM and matches the arguments against the
  constructor's TyVarBinders using zipPatsBndrs, which is made public for this
  purpose. The resulting builder is $bP x = MkT _ _ x.
  
  See Note [Discarding types in the builder expression].
  
  Test cases: T27440a T27440b T27440c T27440d T27440e
              T27583a T27583b T27583c T27583d T27583e T27583f T27583g
  
  Metric Increase: LinkableUsage02
  Metric Decrease: T27336
  
  Assisted-by: Claude Opus 5
  

• eb1dcd4d
  by sheaf at 2026-08-07T17:50:40-04:00

  mkWpFun_FRR: fix ordering of coercion composition
  
  When the subsumption machinery generates an eta-expansion, we must
  perform a representation polymorphism check to ensure the lambda binder
  it introduces has a fixed runtime representation.
  This is done in GHC.Tc.Utils.mkWpFun_FRR.
  
  This check involves composing quite a few coercions, arising from
  representation-polymorphism checks on both the actual and expected
  argument types. These coercions are then chained using HsWrapper
  composition, <.>. The ordering of composition was incorrect, leading to
  the Core Lint failure reported in #27639. This commit fixes that.
  
  Fixes #27639
  

• 3a552476
  by Simon Jakobi at 2026-08-09T15:20:06-04:00

  Word64Map: add compareSize
  
  compareSize m c compares the size of a map to an Int, but unlike
  compare (size m) c it stops traversing the map once the outcome is
  determined.
  
  Based on https://github.com/haskell/containers/pull/1139
  
  Assisted-by: Claude Opus 5
  

• 6e2c99d8
  by Simon Jakobi at 2026-08-09T15:20:06-04:00

  Use a pigeonhole sort for deterministic UniqDFM iteration
  
  Deterministic UniqDFM iteration used a list mergesort, allocating O(n
  log n) cons cells and contributing significantly to compiler allocations
  (#27459).
  
  Use a pigeonhole sort where appropriate, while retaining the mergesort
  fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic
  iteration].
  
  The peak_megabytes_allocated increase for LinkableUsage02 is probably
  due to GC timing noise. See #27613.
  
  -------------------------
  Metric Decrease:
      InstanceMatching
      InstanceMatching1
      ManyAlternatives
      T12707
      T13379
      T13719
      T24471
      T27336
      T5321FD
      T5321Fun
      T783
  Metric Increase 'peak_megabytes_allocated':
      LinkableUsage02
  -------------------------
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• a938ab12
  by sheaf at 2026-08-09T15:20:48-04:00

  Testsuite: don't measure max residency for T27336
  
  We really care more about total allocations for this test, so this commit
  removes the maximum residency measurement.

• 7d94bb78
  by Alan Zimmerman at 2026-08-09T15:21:29-04:00

  EPA: Remove LocatedE, replace with LocatedA
  
  This gets rid of one more LocatedXXX occurrence
  

• 9df24b7e
  by sheaf at 2026-08-10T14:28:30-04:00

  hie.yaml: use a polyglot shell/batch script
  
  This commit merges hie-bios and hie-bios.bat into a single polyglot
  script. This avoids Windows users having to manually update hie.yaml
  in order to be able to use HLS.
  

• 7f75c588
  by Alan Zimmerman at 2026-08-10T14:29:11-04:00

  EPA: Remove type parameter from AnnList
  
  This is a step towards cutting AnnList down to its core for formatting
  lists only
  

• e8d1a0d6
  by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00

  driver: Link object files in a deterministic order
  
  The object files handed to the linker come from the HomePackageTable,
  which is ordered by the order in which modules finished compiling.  With
  -j1 that is the build plan order, with -jN it is whatever the scheduler
  produced, so the same sources can link to different (but equivalent)
  binaries.
  
  The order reaches the output: .text and .rodata contributions are
  concatenated in link order, so e.g. building the hdav executable of the
  DAV package twice, once with -j1 and once with -j4, yields two binaries
  that differ in ~100kB of section contents.
  
  Sort the home modules by module before collecting their linkables,
  guarded under `Opt_ObjectDeterminism` .
  
  Fixes #27612
  
  Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de>
  

• 556db2f3
  by sheaf at 2026-08-10T21:32:06-04:00

  Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite
  
  As remarked in #27628, this module currently sits on a knife's edge: if
  the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then
  SpecConstr suddenly kicks in and causes disastrous reboxing of the
  LiftingContext argument.
  
  To make this less likely to happen, this commit lowers the SpecConstr
  threshold.
  

• c77d88fc
  by sheaf at 2026-08-13T10:15:22-04:00

  Allow rewriting in RuntimeReps for newtype ConPats
  
  This commit implements PHASE 2 of the FixedRuntimeRep plan described in
  Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype
  constructor patterns.
  
  In short, GHC now accepts programs of the form
  
    f (MkN x) = ...
  
  in which the argument 'x' of the newtype constructor pattern 'MkN x'
  has a representation that is not syntactically concrete, e.g. it can be
  'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples.
  
  There are two main parts to the implementation:
  
    1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat.
       See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat.
  
    2. Desugaring. We restructure the code for desugaring pattern matches
       by allowing the scrutinised match variable to be casted. This allows
       us to accumulate coercions and avoids creating binders at intermediate
       types tha don't have a fixed RuntimeRep.
       See the revamped Note [Match Ids] in GHC.HsToCore.Monad.
  
  Fixes #20363
  
  -------------------------
  Metric Increase:
      InstanceMatching
  -------------------------
  

• 6ba9dd41
  by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00

  Improve the documentation of `--show-iface`
  
  This change in particular gets rid of the claim that `--show-iface`
  writes *the* contents of the interface file in question. It doesn’t do
  that; it only writes those parts that are likely of interest to a human
  reader.
  

• 4bd193fa
  by Sylvain Henry at 2026-08-13T10:17:00-04:00

  RTS: fix LDV profiler's slop skipping (#27585)
  
  processHeapForDead was the one heap scanner not updated for the slop
  marker encoding introduced in #19048. It still assumed slop is zeroed:
  
      while (p < bd->free && !*p) p++;   // skip slop
  
  so it stopped at the (StgWord)(-1) sentinel and passed it to
  processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage
  size was read out of LDVW and the scan ran off the block, tripping
  ASSERT(p == bd->free) on a debug RTS and silently corrupting the census
  otherwise.
  
  The loop was hand-copied in four places, so factor it out into skipSlop
  in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and
  LdvProfile.c.
  
  Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
  

• 1446bb03
  by Zubin Duggal at 2026-08-13T10:17:48-04:00

  hadrian: Fix links to remaining doc sites to not use the package hash for haddock links
  
  In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock
  directory. This patch takes care of a  few remaining links that were missed in that patch
  
  Fixes #27671
  

• 257c3ed7
  by Simon Jakobi at 2026-08-13T10:18:29-04:00

  Testsuite: widen InstanceMatching acceptance window to 5% (#27673)
  
  ...in order to unblock CI.
  
  Assisted-by: Claude Fable 5
  

• e4cfaaa0
  by Simon Peyton Jones at 2026-08-14T01:09:32+02:00

  Major patch to re-engineer known-key names
  
  This big patch implements the New Plan for known-key names,
  described in #27013.
  
  Read the big Note [Overview of known-key names] in GHC.Types.Name
  
  Some things had to be reworked slightly to accomodate the new known-keys
  design. A significant one was the generation of auxiliary KindRep
  bindings, which was greatly simplified. Note [Grand plan for Typeable]
  was updated accordingly. Another example: GHC.Internal.CString was
  merged into GHC.Internal.Types.
  
  Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>
  
  The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed
  
  Metrics: compile_time/bytes allocated
  -------------------------------------
                                                         Baseline
                                    Test    Metric          value      New value Change
  ------------------------------------------------------------------------------------------
        MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432  +2.8%  BAD
     MultiComponentModulesRecomp(normal) ghc/alloc    601,924,960    621,884,888  +3.3%  BAD
  MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704  +5.4%  BAD
               MultiLayerModules(normal) ghc/alloc  3,861,537,072  3,706,919,512  -4.0% GOOD
                          T13701(normal) ghc/alloc  3,517,246,392  3,237,179,616  -8.0% GOOD
                          T13820(normal) ghc/alloc     28,961,056     29,663,208  +2.4%  BAD
                          T14697(normal) ghc/alloc    472,044,184    443,550,048  -6.0% GOOD
                          T18140(normal) ghc/alloc     47,905,664     49,115,808  +2.5%  BAD
                           T4801(normal) ghc/alloc    269,339,096    263,432,040  -2.2% GOOD
                            T783(normal) ghc/alloc    341,112,672    333,339,952  -2.3% GOOD
                  hard_hole_fits(normal) ghc/alloc    222,164,728    213,433,808  -3.9% GOOD
                        mhu-perf(normal) ghc/alloc     49,011,440     46,706,280  -4.7% GOOD
  
                               geo. mean                                          +0.1%
                               minimum                                            -8.0%
                               maximum                                            +5.4%
  
  All performance regressions were investigated in depth. The surviving
  ones:
  
  - MultiComponentModules100, MultiComponentModulesRecomp100,
    MultiComponentModulesRecomp regresses because existing bugs that make
    an additional implicit edge do too much redundant work: #27053 and #27461
  - T13820, T18140, T10547, T13035 regress because we load an additional
    interface and associated Names for GHC.Essentials.
  
  -------------------------
  Metric Decrease:
      MultiLayerModules
      T13379
      T13701
      T14697
      T26989
      T4801
      T783
      T9961
      hard_hole_fits
      mhu-perf
      size_hello_artifact
      size_hello_obj
      size_hello_unicode
  Metric Increase:
      LinkableUsage01
      LinkableUsage02
      MultiComponentModules100
      MultiComponentModulesRecomp
      MultiComponentModulesRecomp100
      T10547
      T13035
      T13820
      T18140
      T18698a
      T18698b
      T20049
  -------------------------
  
  Bumps submodule binary
  
  Closes #27013
  

• 61665e79
  by sheaf at 2026-08-14T01:09:33+02:00

  Allow GHC.Essentials to be hidden
  
  This commit overhauls several aspects of the known entity handling,
  in order to allow GHC.Essentials to be hidden without a proliferation
  of special cases in the compiler.
  
  The main contribution is to introduce the 'UnresolvedImport' datatype
  which cleans up a lot of ad-hoc handling relating to 'ModSummary',
  fixing #27603. This allows us to reduce duplication, e.g. by having
  Backpack reuse 'mkUnresolvedImports' instead of replicating the
  "add implicit imports" logic. It also makes it easier to avoid
  undesirable edge cases (such as making sure that the Template Haskell
  'reifyModule' function does not leak the implicit GHC.Essentials import).
  In particular, the infamous 'findImportedModuleWithIsBoot' is now simply
  'resolveImport', taking a single 'UnresolvedImport' and resolving it
  to a 'FindResult' (usually a 'Module').
  
  Other changes:
  
    - Cache the result of looking up GHC.Essentials (in TcM and DsM
      environments) to avoid redundant work.
      This reduces allocations on LinkableUsage01 and hard_hole_fits.
    - Properly look up known entities for StaticPointers like we do for
      other known entities everywhere else. This allows e.g. modules in
      ghc-internal to use -XStaticPointers.
    - When using multiple home units, we are now careful to handle the
      situation in which we may have multiple GHC.Essentials modules
      around. See the new tests under 'driver/multipleHomeUnits'.
  

• b19fcc1c
  by Vladislav Zavialov at 2026-08-14T06:26:11-04:00

  Increase test coverage of diagnostics, batch 2
  
  Add test cases for the previously untested diagnostics:
    [GHC-26133] TcRnForeignImportPrimSafeAnn
    [GHC-68444] SumAltArityExceeded
    [GHC-63966] IllegalSumAlt
    [GHC-23882] IllegalDeclaration
    [GHC-60220] InvalidCCallImpent
    [GHC-18816] RecGadtNoCons
    [GHC-38140] GadtNoCons
    [GHC-37056] InvalidTypeInstanceHeader
    [GHC-78486] InvalidTyFamInstLHS
    [GHC-39639] DefaultDataInstDecl
    [GHC-78822] AssocDefaultNotAssoc
    [GHC-43510] NotSimpleUnliftedType
    [GHC-41843] IOResultExpected
    [GHC-07641] AtLeastOneArgExpected
    [GHC-52886] InvalidTopDecl
  
  Remove unused error constructors:
    [GHC-92057] ImportLookupAmbiguous
  

• 7b27f25a
  by Simon Jakobi at 2026-08-14T06:26:54-04:00

  testsuite: Drop peak_megabytes_allocated from LinkableUsage tests
  
  LinkableUsage01/02 collected all metrics with a 2% tolerance. For
  peak_megabytes_allocated, whose granularity is 1 MB, that window is
  under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the
  test (#27613, #27489). Drop that metric: max_bytes_used guards the
  Linkable-retention property with byte granularity, at a tolerance
  that still comfortably exceeds the noise observed in CI.
  
  Assisted-by: Claude Fable 5
  

• e5de423b
  by Simon Jakobi at 2026-08-14T06:26:54-04:00

  testsuite: Don't truncate fractional baselines when computing bounds
  
  RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with
  int() before applying the tolerance. Baselines can be fractional (they
  are averaged over several measurements), so this skewed the acceptance
  window downwards: in #27613, a baseline of 33.67 at 2% tolerance
  yielded bounds (32, 34) instead of (32, 35), rejecting a measurement
  that was within tolerance.
  
  Assisted-by: Claude Fable 5
  

• db959f83
  by Simon Jakobi at 2026-08-14T15:16:44-04:00

  testsuite: Expect length001 failure in nonmoving_thr_sanity
  
  length001 relies on an optimization rule to avoid excessive stack use.
  The nonmoving_thr_sanity way does not enable optimization, so classify
  its stack overflow as an expected failure, as is already done for the
  other unoptimized nonmoving ways.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• 4f2b7d90
  by Simon Jakobi at 2026-08-14T15:16:44-04:00

  testsuite: Omit T22859 in nonmoving threaded ways
  
  T22859 checks allocation-limit handlers with output that depends on
  precise allocation behaviour. The nonmoving threaded ways change where
  these limits are reached, just as the already-omitted LLVM ways do.
  
  Omit these ways instead of treating their incidental output differences
  as test failures.
  
  Assisted-by: gpt-5.6-sol via Codex CLI
  

• c4abddcb
  by Simon Jakobi at 2026-08-14T15:16:44-04:00

  rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761)
  
  Since d1f3c63701, Eq ThreadId is implemented via the RTS function
  eq_thread, but the JS RTS never provided it, so comparing ThreadIds
  for equality on the JS backend crashed with
  
      ReferenceError: h$eq_thread is not defined
  
  Like the C implementation, h$eq_thread uses pointer equality: The JS
  RTS has exactly one thread object per thread.
  
  Since previously no test exercised eq_thread directly, this commit
  adds a test covering equality, its stability across GC, and agreement
  with Ord.
  
  Assisted-by: Claude Fable 5
  

• 4a7defa1
  by Simon Jakobi at 2026-08-14T15:16:44-04:00

  testsuite: Make listThreads1 insensitive to the RTS's own threads
  
  listThreads1 expected `listThreads` to return exactly [ThreadId 1]. That
  holds only under a non-threaded RTS. Under a threaded RTS however there
  are more threads present, so we change the test to simply check that
  `myThreadId` is present in the list.
  
  Assisted-by: Claude Opus 5
  

• b757727a
  by Vladislav Zavialov at 2026-08-14T15:17:27-04:00

  Fix tcLookupId panic with RequiredTypeArguments and PatternSynonyms (#27586)
  
  The arguments declared on the left-hand side of a pattern synonym are looked up
  as term variables bound by its right-hand side. Prior to this patch, that lookup
  panicked with RequiredTypeArguments:
  
      data T a where
        MkT :: forall a -> T a
  
      pattern P :: Int -> T Int
      pattern P x = MkT x
  
  On the RHS, `x` looks like a term argument, so the renamer binds it in the term
  namespace. Only during type checking does it turn out to be a type variable, so
  the lookup on the LHS finds an ATyVar rather than an ATcId. As the lookup was
  done with tcLookupId, it resulted in a panic.
  
  Now the arguments are looked up with tcLookupPatSynArg, which reports an illegal
  term-level use of `x`, just as an ordinary function definition `f (MkT x) = x`
  does.
  
  Test cases: T27586a T27586b T27586c
  
  Assisted-by: Claude Opus 5
  

• c130188d
  by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00

  loopImports: Don't dup ms_uid in summary imports
  
  We were writing the ms_unitid of the mod summary with every single
  import of that module
  
  That complicated the code (as though the UnitId in that list could ever
  be something else) and also allocates unnecessarily per every mod
  import. Very slight allocation decrease measured locally in a few tests:
  (MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%)
  
  Purely a clean up.
  

• c71166a8
  by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00

  downsweep: make control flow simpler and cache correct
  
  This refactor extracts the control flow of downsweep into a single
  function `dfsBuild`, which takes care of iteratively expanding and
  traversing all nodes of the in-construction module graph necessary to
  build a full `ModuleGraph`.
  
  There are three levels of caching going on, all of which are necessary
  to make sure we don't do repeated work (notably, NEVER summarise the
  same module twice).
  
  1. `dfsBuild` accumulates the final module graph and never revisits the
     same node of the module graph. Cache is keyed by the final
     `ModuleGraph`s `NodeKey`s.
  
  2. For Module A in home-unit u1, each import in the list of imports
     needs to be *found* (call to `findImportedModuleWithIsBoot`): at this
     point, we only have the `ModuleName` of the import, not the `Module`.
     This *finding* is somewhat expensive, so we cache it as well
     (`ImportsCache`). The cache key is the home-unit to which the module
     belongs~[1], the import package qualifier, and the ModuleName.
  
     [1] Different home-units will have different package flags, which means
     potentially different `Module` resolution for the same `ModuleName`.
  
  3. The most expensive operation we want to avoid is summarising a
     `Module` into a `ModSummary`, which notably involves parsing the
     module header from scratch.
     The third cache, in essence, maps a `Module` to its `ModSummary`
     (named `ModSummaryCache`). This cache upholds the invariant: we NEVER
     summarise the same module twice. In practice, the cache key is the
     Module's UnitId and the Source path; the reason is we need to
     distinguish between `.hs` and `.hs-boot` files, as their summaries
     will differ.
  
     Note that (2) can't guarantee this alone: Two ModuleName imports in
     separate units can (and likely do) map to the same `Module`.
  
  Note that the previous implementation failed to achieve the
  no-duplicate-work summarisation invariant, and we ended up doing a
  quadratic amount of processing in scenarios like test
  `MultiComponentModules100`.
  
  See also Note [Downsweep Control Flow and Caching]
  
  Fixes #27461
  
  Perf changes:
           MultiComponentModules(normal) ghc/alloc  2,097,389,264  1,992,186,736  -5.0% GOOD
        MultiComponentModules100(normal) ghc/alloc 24,310,173,770 21,293,867,360 -12.4% GOOD
     MultiComponentModulesRecomp(normal) ghc/alloc    602,761,394    498,543,984 -17.3% GOOD
  MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,968,240  8,895,404,864 -25.2% GOOD
  
  -------------------------
  Metric Decrease:
      MultiComponentModules
      MultiComponentModules100
      MultiComponentModulesRecomp
      MultiComponentModulesRecomp100
  -------------------------
  

• ebc4047b
  by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00

  implicitRequirementsShallow can never reach HoleUnit
  
  findImportedModule will never return `HoleUnit` for a `ModuleName`
  (a `HoleUnit` can only be found as a signature instantiation, never as a
  directly *imported* thing)
  
  Therefore, we can drop `[ModuleName]` returned by
  `implicitRequirementsShallow`, which makes many things dead code.
  Namely, the call to `implicitRequirementsShallow` from
  GHC.Driver.Downsweep which was a performance bottleneck (for doing lots
  of duplicate work in findImportedModule) is now entirely gone.
  
  Fixes #27053
  
  In an MR with this patch and the downsweep refactor (previous commit), CI says:
  
           MultiComponentModules(normal) ghc/alloc  2,097,396,728  1,943,662,304  -7.3% GOOD
        MultiComponentModules100(normal) ghc/alloc 24,310,182,136 17,227,574,440 -29.1% GOOD
     MultiComponentModulesRecomp(normal) ghc/alloc    602,769,518    449,973,656 -25.3% GOOD
  MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,976,408  4,828,894,160 -59.4% GOOD
  
  -------------------------
  Metric Decrease:
      MultiComponentModules
      MultiComponentModules100
      MultiComponentModulesRecomp
      MultiComponentModulesRecomp100
  -------------------------
  

• 85a6ab01
  by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00

  downsweep: Cache negative results
  
  When traversing a module graph structure, a uniquely identified node
  should always expand to the same thing.
  
  I don't see how visiting the same node which failed to be expanded a
  first time would ever successfully expand the second time we try to
  expand it (eg. when coming from a different edge to it -- it is still
  the same node!). The node expansion is local, based just based on the
  node itself, not on the path to get there.
  
  Therefore, this patch removes the weird behavior and commentary of
  `dfsBuild` wrt to `Nothing` not being cached and being potentially
  expanded a second time around to something different, which was
  misleading and, ultimately, incorrect.
  
  Now, we have a `MGRes`, which is more explicit about a node being
  Skipped just being a node that is ignored whenever it is found (and that
  skip is cached) -- and we may want to do this due to failures or due to
  just trying nodes which might not work on purpose, like hs-boots.
  
  We uniformly cache positive and negative results and remove the
  assumption that there might be an ordering in which the same node
  visited at a later time might be expanded differently.
  
  This makes it possible to traverse the module nodes in parallel without
  a change in behavior, since there's no longer a hidden ordering
  requirement.
  

• 56747c3f
  by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00

  Organize and clean-up GHC.Driver.Downsweep
  
  Simply some cosmetic changes, moving definitions around to structure the
  module better into its relevant sections
  
  (In go (ns ++ ss), it's not a problem to use ++ because it's a good
  producer and we won't have to append fully before processing the next
  item in go)
  

• 12f64118
  by Wolfgang Jeltsch at 2026-08-15T06:31:12-04:00

  Add support for textual output of bytecode file content
  

• a737df91
  by Brandon Chinn at 2026-08-15T12:40:25-04:00

  Add law in qualified strings doc
  

• e3188581
  by Zubin Duggal at 2026-08-15T12:41:06-04:00

  DmdAnal: Fix maxDmdType
  
  We need to eta expand the smaller DmdType using defaultArgDmd, like in lubDmdType.
  
  Introduce zipDmdType as a common combinator to implement both maxDmdType and lubDmdType
  uniformly.
  
  fixes #27626
  

• ca9b0b22
  by mangoiv at 2026-08-15T12:41:47-04:00

  hadrian: set the executable bit for hie-bios.bat
  

• 1aac7095
  by sheaf at 2026-08-16T04:37:16-04:00

  Avoid wasteful allocations in mkTyConAppCo
  
  The idiom "traverse isReflCo_maybe" followed by "map fst" used in
  'GHC.Core.Coercion.mkTyConAppCo' was allocating a lot of waste.
  This commit uses 'GHC.Data.Unboxed.traverseMaybeUB' to avoid all these
  unnecessary intermediate allocations.
  
  In a quick microbenchmark for 'mkTyConAppCo', this change resulted in:
    - refl case (all argument coercions are reflexive):
      - -60% runtime
      - -80% allocations
    - non-refl case:
      - from 0% to -12% runtime (depending on which argument is non-refl)
      - from 0% to -70% allocations ( -- '' -- )
  
  Fixes #27648
  
  -------------------------
  Metric Decrease:
      FamAppCachePerf
      SimplCastPerf
      T12425
      T15703
      T26426
      T3064
      T9872a
      T9872b
      T9872b_defer
      T9872c
      T9872d
      T5321Fun
      T9020
      T9630
      TcPlugin_RewritePerf
  Metric Increase:
      LinkableUsage02
  -------------------------
  

• 3915e982
  by Alan Zimmerman at 2026-08-16T04:37:58-04:00

  EPA: Remove al_trailing from AnnList
  
  It was not being used
  

• fed942ac
  by Andreas Klebinger at 2026-08-17T12:11:57-04:00

  testsuite: Use sigkill in process009.
  
  SIGHUB might have been blocked by a (grand)*parent of the test.
  In such cases the test would fail as the python process would simply
  exist gracefully instead of committing to a premature end.
  
  By using SIGKILL we can rely on the signal not being blocked, fixing #27578
  in the process.
  

• 574c875f
  by Andreas Klebinger at 2026-08-17T12:12:39-04:00

  Simplify comparison in DFM.hs
  
  Fixes #27669
  

• d8f1a2a3
  by Alan Zimmerman at 2026-08-17T12:13:18-04:00

  TTG: Add extension points to BooleanFormula
  
  They are currently unused, but will be used for exact print
  annotations next, allowing us to get rid of LocatedBF / SrcSpanAnnBF
  

• 93a2b20f
  by Andreas Klebinger at 2026-08-18T04:31:04-04:00

  Fix a number of incorrect module references:
  
  Fix module reference in Note [DataCon wrappers are conlike].
  Fix module reference in Note [Detailed InertCans Invariants].
  Fix module reference in Note [GHC's data format representations].
  Fix module reference in Note [Grand plan for static forms].
  Fix module reference in Note [How tuples work].
  Fix module reference in Note [Solved dictionaries].
  Fix module reference in Note [Stacktraces from Info Table Provenance Entries (IPE based stack unwinding)].
  Fix module reference in Note [The VarBndr type and its uses].
  
  Found the incorrect references with a llm.
  

• eb0dfb01
  by Simon Jakobi at 2026-08-18T04:31:44-04:00

  ci: Run stack-hadrian-build only in full-ci pipelines
  
  The job exists to catch changes that break hadrian/build-stack (#18726),
  but nothing in the pipeline depends on it, and it can only break when
  hadrian's dependencies change. Restricting it to full-ci (like
  hadrian-multi) still covers marge-bot merge batches, so such breakage
  cannot reach master unnoticed, while ordinary validate pipelines skip
  the job.
  
  Assisted-by: Claude Fable 5
  

• b9160962
  by Simon Jakobi at 2026-08-20T14:57:52-04:00

  testsuite: Show baseline sample count and range in perf failures
  
  A perf baseline is the mean of all samples recorded for a commit, and
  it prints as a single number, hiding how far the samples spread. When
  the spread is wide, this can indicate an unstable metric that isn't
  actually useful as a signal for the perf tests.
  For example, in #27602, T27336's peak_megabytes_allocated baseline
  showed as 757 when the underlying samples were 605 and 909.
  
  When the baseline is averaged from more than one sample, say so in the
  failure output: the one-line stat-failure reason shows the sample
  range, and the detail block lists the raw samples. Single-sample
  baselines print exactly as before.
  
  Context: #27602
  
  Assisted-by: Claude Fable 5
  

• a4979877
  by Simon Jakobi at 2026-08-20T14:57:52-04:00

  testsuite: Fold Baseline into CommitMetric
  
  A Baseline was just a CommitMetric plus the commit it came from, built
  by copying fields across. Since get_commit_metric already knows that
  commit, record it on CommitMetric itself and drop Baseline. This also
  collapses both branches of find_baseline into plain returns.
  
  Assisted-by: Claude Fable 5
  

• 99fb8d68
  by Simon Jakobi at 2026-08-20T14:57:52-04:00

  ci: Clarify comment on pushing perf notes after failures
  
  Context: #27602
  
  Assisted-by: Claude Fable 5
  

• 2ca87972
  by Alan Zimmerman at 2026-08-20T14:58:36-04:00

  EPA: Remove LocatedBC / SrcSpanBF
  
  The custom annotations are now in the BooleanFormula TTG extension
  points, so LBooleanFormula can now use the standard LocatedA.
  

• d2bc32aa
  by Simon Peyton Jones at 2026-08-21T12:59:26-04:00

  Better handling of serialisation of wired-in names
  
  Fixes #27501
  

• d2795ffc
  by Alan Zimmerman at 2026-08-21T13:00:05-04:00

  EPA: Remove NoEpTok/NoEpUniTok, using an unhelpful SrcSpan instead
  
  Also introduce helper functions noEpTok and noEpUniTok to serve
  as simple replacements in code inserting an token annotation without
  location information.
  

• b5d29ab8
  by Brandon Chinn at 2026-08-25T18:42:08-04:00

  Add Data.RealFloat and Infinity/NegInfinity/NaN pattern synonyms (#26961)
  

• e60eb3bc
  by Andreas Klebinger at 2026-08-25T18:42:59-04:00

  rts linker: Fix pointer arithmetic issue in flushInstructionCacheRISCV64
  
  We accidentally operated over `uint64_t*` when we should use `uint8_t`.
  
  Fixes #27569
  

• e9bbe8f9
  by Andreas Klebinger at 2026-08-26T15:09:23-04:00

  cmm dumps: Add machop width info with -dppr-debug for infix ops.
  

• 86e3a9d8
  by Andreas Klebinger at 2026-08-26T15:09:24-04:00

  CmmLint: Check for unsupported MachOp widths
  
  machOpArgReps now maps MachOp + Width to a list of supported
  argument widths or Nothing if the given operation is not supported
  at the given width.
  
  This allows us to check for nonsensical combinations like FloatToInt
  at Word16.
  
  Similarly we now check that every address is actually wordwidth.
  

• 13781cca
  by Andreas Klebinger at 2026-08-26T15:09:24-04:00

  arm64 ncg: The big subword truncation fix.
  
  A set of slightly related fixes to arm subword handling:
  
  Bitmask immediates:
  
  Don't produce overflowing assembly literals.
  There is still another bug here that causes us to miss some valid
  literals but we will fix that later.
  
  Improve subword truncation handling:
  
  We now use a small set of helpers to truncate `Register` values rather
  than truncating immediate `Reg` values which greatly simplifies the code
  structure. This fixes a great many bugs to do with sign/zero extending subwords
  or the lack thereof.
  
  We now establish the invariant that subword values are zero-extended at
  every site at which they come into "scope" of the ncg, and rely on the
  invariant throughout rather than pessimistically inserting redundant
  extensions in a hodgepodge manner at the use sites of these values.
  
  This fixes at least the bugs described in issues #27533, #27430
   #27537, #27538, #27539, and #27550. But likely more bugs yet not
  found.
  
  Subword ffi results:
  Apply truncations when calling functions returning
  subword values.
  
  genCondJump:
  Don't sign extend signed values in the input register as
  it might map to a local variable, corrupting the value stored within.
  
  Fix subword store/load instructions.:
  
  We used to read those at 32bit width even for smaller values possibly
  resulting in invalid memory access. Now we construct the suffix for
  subword variants based on the instruction format for these.
  

• d8fa5d7c
  by Andreas Klebinger at 2026-08-26T15:09:24-04:00

  arm64 ncg: Fix MO_V_Broadcast for non-literals.
  
  We now use OpReg instead of OpScalarAsVec as required since we broadcast a gp register.
  
  Also adds a test. Fixes #27565.
  

• 94822c95
  by Andreas Klebinger at 2026-08-26T15:09:24-04:00

  Add some test cases covering bugs in the arm ncg.
  
  * Test for #27430 (subword ffi results)
  * #27537 - subword conversions
  * #27538 - subwords used in conditional
  * #27533 - single byte read
  

• dd1ba88a
  by Andreas Klebinger at 2026-08-26T15:09:24-04:00

  cmmLint: Lint against MO_FS_Truncate subword use.
  

• fd22f71e
  by Zubin Duggal at 2026-08-26T15:10:20-04:00

  ghc-internal: annotateSTM should use catchSTM# rather than catch#
  
  A catch# frame inside a transaction breaks retry and async exception
  delivery.
  
  Fixes #27657
  

• bb324171
  by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00

  rts: refactor to reduce THREADED_RTS in MSG_UPD_TSO_FLAGS
  
  - No behavior change in this commit (well, a small optimization here
    makes us do less work if the target TSO owned by the curr. capability)
  - Move all THREADED_RTS CPP needed into `updThreadFlag`
  - Merge MSG_SET_TSO_FLAGS and MSG_UNSET_TSO_FLAGS into MSG_UPD_TSO_FLAGS
    plus a `set` bool field in the MessageUpdTSOFlag struct
  
  Towards #27729
  

• ed99b7b7
  by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00

  rts: Fix race condition in MSG_UPD_TSO_FLAGS execution
  
  The code for processing the MSG_UPD_TSO_FLAGS message was not taking
  into consideration that the TSO's owner might have moved in between that
  capability receiving the message (since it was its previous owner) and
  starting to process its inbox (a point at which it was no longer the
  owner)
  
  Added Note [TSO owner may change in between Msg being sent and received]
  to explain this race and the pattern used to fix this, where we just
  forward the message to the new owner.
  
  Fixes #27729
  

• cd653714
  by Alan Zimmerman at 2026-08-26T15:11:49-04:00

  EPA: Uses Parsers.parseModule for exactprint tests
  
  Parsers.parseModule is the advertised way to parse for use for exact
  printing in the ghc-exactprint library. This commit updates the GHC
  exact print testing to use it.
  
  This requires moving the comment balancing that was occurring
  only in the test path into the advertising parser path, so it moves
  from Transforms.hs to Utils.hs.
  
  Also update the comment adding to honour trailing annotations
  

• 1dd3de78
  by Simon Jakobi at 2026-08-28T09:16:56+02:00

  Add --print-enabled-cpu-features flag
  
  GHC now supports a new mode flag --print-enabled-cpu-features, which
  prints a JSON object describing the CPU features currently enabled for
  code generation, together with a set of -m... flags that reproduce the
  effective feature set for the current target. Dynamic options such as
  -mavx2 and -mbmi2 are respected.
  
    $ ghc -mavx2 --print-enabled-cpu-features
    {"tag":"enabled-cpu-features","version":1,"target":"x86_64-linux-gnu",
     "features":["SSE","SSE2","SSE3","SSSE3","SSE4.1","SSE4.2","AVX","AVX2"],
     "as_m_flags":["-mavx2"]}
  
  The primary purpose of this flag is for testing the -march=native option
  (#25450).
  
  Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
  

• dbd97dc4
  by Simon Jakobi at 2026-08-28T09:16:56+02:00

  Implement -march=native for x86/x86_64
  
  Add a -march=native flag that probes the host CPU and enables the
  matching CPU-feature DynFlags, so the effect applies to both the NCG
  and LLVM backends.
  
  The flag handler only records a marker, since flag parsing is pure; the
  probe and feature application run in parseDynamicFlagsFull, guarded
  against non-x86 targets and cross-compilation. Detected SSE/AVX and BMI
  levels are collapsed to their maximum and folded additively into the
  existing feature flags, so explicit -m... options are never disabled.
  The probe is memoized for the lifetime of the process.
  
  The probe itself is a small C shim over GCC/Clang's
  __builtin_cpu_supports. The compiler's runtime (libgcc resp.
  compiler-rt) carries the actual detection logic, so GHC doesn't need to
  get CPUID leaves, XSAVE gating, and OS quirks right itself. In
  particular, both runtimes gate "avx"/"fma"/"avx512*" on OS support for
  the corresponding register state, including the lazily enabled AVX-512
  XSAVE state on x86_64 macOS. GFNI is queried only under GCC >= 11 or
  Clang >= 12, whose feature lists are known to include it, and older
  bootstrap compilers merely lose GFNI detection. Compilers without the
  builtin (MSVC) report no features, so -march=native enables nothing
  beyond baseline there.
  
  The flag is registered in expected-undocumented-flags.txt due to #27321.
  
  Thanks to @aratamizuki for pointing out the AVX-512 XSAVE quirk on
  x86_64 macOS and for testing!
  
  Closes #25450
  
  Assisted-by: Claude Opus 4.8
  Assisted-by: Claude Fable 5
  

1829 changed files:

• .gitignore
• .gitlab-ci.yml
• .gitlab/ci.sh
• .gitlab/generate-ci/gen_ci.hs
• .gitlab/jobs.yaml
• .gitlab/merge_request_templates/Default.md
• .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
• .gitlab/test-metrics.sh
• boot
• + changelog.d/21101
• + changelog.d/26616
• + changelog.d/27380
• + changelog.d/27532
• + changelog.d/27626
• + changelog.d/AbstractQ
• + changelog.d/T17833
• + changelog.d/T20363
• + changelog.d/T21176
• + changelog.d/T21628
• + changelog.d/T26423
• + changelog.d/T26532
• + changelog.d/T26716
• + changelog.d/T26978
• + changelog.d/T27046
• + changelog.d/T27047
• + changelog.d/T27123.md
• + changelog.d/T27182.md
• + changelog.d/T27225
• + changelog.d/T27308
• + changelog.d/T27314.md
• + changelog.d/T27317
• + changelog.d/T27329
• + changelog.d/T27359
• + changelog.d/T27360
• + changelog.d/T27368-ppr-unreachable-cmm-blocks.md
• + changelog.d/T27374
• + changelog.d/T27386
• + changelog.d/T27440
• + changelog.d/T27455
• + changelog.d/T27456
• + changelog.d/T27557
• + changelog.d/T27583
• + changelog.d/T27586
• + changelog.d/T27589
• + changelog.d/T27639
• + changelog.d/T27657
• + changelog.d/add_can_drop_to_occurence_analyser
• + changelog.d/arm_ncg_fixes_T27430
• changelog.d/config
• + changelog.d/deterministic-usage-order
• + changelog.d/downsweep-refactor
• + changelog.d/fix-absent-dict-projection
• + changelog.d/fix-cmm-atomic-load-store
• + changelog.d/fix-cmm-dump-labels
• + changelog.d/fix-compacting-gc-ap-27434
• + changelog.d/fix-exponential-case-desugar-27383
• + changelog.d/fix-heap-census-large-arrays-19048
• + changelog.d/fix-layout-stack-fcall
• + changelog.d/fix-make-install-j
• + changelog.d/fix-peekitbl-no-tntc
• + changelog.d/fix-plugin-finder-multi-home-unit.md
• + changelog.d/fix-unreg
• + changelog.d/fix-use-std-ap-thunk
• + changelog.d/generically-mconcat
• changelog.d/hadrian-response-files.md
• + changelog.d/hadrian-stale-package-confs-26661
• + changelog.d/inter-module-far-jumps-aarch64-default
• + changelog.d/interactive-error-hints
• + changelog.d/lazy-field-annotations
• + changelog.d/link-deterministic-order
• + changelog.d/march-native
• changelog.d/module-graph-reuse-in-downsweep
• changelog.d/more-efficient-home-unit-imports-finding
• + changelog.d/pp-set-ghc-version
• + changelog.d/print-enabled-cpu-features
• + changelog.d/reexported-module-errors
• + changelog.d/refactor-known-names
• + changelog.d/remove-ddump-json-flag
• changelog.d/semaphore-v2
• + changelog.d/show-byte-code
• + changelog.d/stable-core-dump-order-27296
• + changelog.d/stage2-cross-compilers
• + changelog.d/tag-inference-27005
• + changelog.d/tool-messages-27370
• + changelog.d/unit-index
• + changelog.d/unused-type
• + changelog.d/warn-defaulted-callstack
• compiler/.hlint.yaml
• compiler/GHC.hs
• + compiler/GHC/Builtin.hs
• + compiler/GHC/Builtin/KnownKeys.hs
• + compiler/GHC/Builtin/KnownOccs.hs
• + compiler/GHC/Builtin/Modules.hs
• − compiler/GHC/Builtin/Names.hs
• − compiler/GHC/Builtin/Names/TH.hs
• compiler/GHC/Builtin/PrimOps.hs
• compiler/GHC/Builtin/PrimOps/Casts.hs
• compiler/GHC/Builtin/PrimOps/Ids.hs
• + compiler/GHC/Builtin/TH.hs
• compiler/GHC/Builtin/Uniques.hs
• compiler/GHC/Builtin/Uniques.hs-boot
• − compiler/GHC/Builtin/Utils.hs
• + compiler/GHC/Builtin/WiredIn/Ids.hs
• compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs
• compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs
• compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs
• compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Breakpoints.hs
• compiler/GHC/ByteCode/Serialize.hs
• + compiler/GHC/ByteCode/Show.hs
• compiler/GHC/ByteCode/Types.hs
• compiler/GHC/Cmm.hs
• compiler/GHC/Cmm/CLabel.hs
• compiler/GHC/Cmm/Expr.hs
• compiler/GHC/Cmm/LayoutStack.hs
• compiler/GHC/Cmm/Lint.hs
• compiler/GHC/Cmm/MachOp.hs
• compiler/GHC/Cmm/Parser.y
• compiler/GHC/Cmm/Pipeline.hs
• compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
• compiler/GHC/CmmToAsm/AArch64/Instr.hs
• compiler/GHC/CmmToAsm/AArch64/Ppr.hs
• compiler/GHC/CmmToAsm/BlockLayout.hs
• compiler/GHC/CmmToAsm/Format.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/Linear.hs
• compiler/GHC/CmmToAsm/Reg/Linear/FreeRegs.hs
• compiler/GHC/CmmToAsm/Reg/Linear/JoinToTargets.hs
• compiler/GHC/CmmToAsm/Reg/Linear/X86.hs
• compiler/GHC/CmmToAsm/Reg/Linear/X86_64.hs
• compiler/GHC/CmmToAsm/X86/RegInfo.hs
• compiler/GHC/CmmToAsm/X86/Regs.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Class.hs
• compiler/GHC/Core/Coercion.hs
• 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/Lint.hs
• compiler/GHC/Core/Make.hs
• compiler/GHC/Core/Multiplicity.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/CprAnal.hs
• compiler/GHC/Core/Opt/DmdAnal.hs
• compiler/GHC/Core/Opt/LiberateCase.hs
• compiler/GHC/Core/Opt/OccurAnal.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/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/Rules.hs
• compiler/GHC/Core/SimpleOpt.hs
• compiler/GHC/Core/Subst.hs
• compiler/GHC/Core/TyCo/FVs.hs
• compiler/GHC/Core/TyCo/Ppr.hs
• compiler/GHC/Core/TyCo/Rep.hs
• compiler/GHC/Core/TyCon.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Unfold.hs
• compiler/GHC/Core/Unify.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToIface.hs
• compiler/GHC/CoreToStg.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/BooleanFormula.hs
• compiler/GHC/Data/FastString.hs
• compiler/GHC/Data/IOEnv.hs
• compiler/GHC/Data/List/NonEmpty.hs
• compiler/GHC/Data/StringBuffer.hs
• compiler/GHC/Data/Unboxed.hs
• compiler/GHC/Data/Word64Map/Internal.hs
• compiler/GHC/Data/Word64Map/Lazy.hs
• compiler/GHC/Data/Word64Map/Strict.hs
• compiler/GHC/Data/Word64Map/Strict/Internal.hs
• compiler/GHC/Driver/Backend.hs
• compiler/GHC/Driver/Backpack.hs
• compiler/GHC/Driver/CodeOutput.hs
• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/StgToCmm.hs
• compiler/GHC/Driver/Config/Tidy.hs
• + compiler/GHC/Driver/CpuFeatures.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/Flags.hs
• compiler/GHC/Driver/GenerateCgIPEStub.hs
• compiler/GHC/Driver/Main/Compile.hs
• 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/MakeFile.hs
• compiler/GHC/Driver/Pipeline.hs
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Plugins.hs
• compiler/GHC/Driver/Session.hs
• compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs.hs
• compiler/GHC/Hs/Basic.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• compiler/GHC/Hs/Decls/Overlap.hs
• compiler/GHC/Hs/Doc.hs
• − compiler/GHC/Hs/Doc.hs-boot
• compiler/GHC/Hs/DocString.hs
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Extension.hs
• + compiler/GHC/Hs/Extension/Pass.hs
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Instances.hs
• compiler/GHC/Hs/Lit.hs
• compiler/GHC/Hs/Pat.hs
• − compiler/GHC/Hs/Specificity.hs
• compiler/GHC/Hs/Stats.hs
• compiler/GHC/Hs/Syn/Type.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Arrows.hs
• compiler/GHC/HsToCore/Binds.hs
• compiler/GHC/HsToCore/Breakpoints.hs
• + compiler/GHC/HsToCore/Breakpoints/Types.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Errors/Types.hs
• compiler/GHC/HsToCore/Expr.hs
• compiler/GHC/HsToCore/Foreign/C.hs
• compiler/GHC/HsToCore/Foreign/Call.hs
• compiler/GHC/HsToCore/Foreign/JavaScript.hs
• compiler/GHC/HsToCore/Foreign/Utils.hs
• compiler/GHC/HsToCore/Foreign/Wasm.hs
• compiler/GHC/HsToCore/ListComp.hs
• compiler/GHC/HsToCore/Match.hs
• compiler/GHC/HsToCore/Match.hs-boot
• compiler/GHC/HsToCore/Match/Constructor.hs
• compiler/GHC/HsToCore/Match/Literal.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc.hs
• compiler/GHC/HsToCore/Pmc/Check.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Ppr.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/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/Env.hs
• − compiler/GHC/Iface/Env.hs-boot
• compiler/GHC/Iface/Errors.hs
• compiler/GHC/Iface/Errors/Ppr.hs
• compiler/GHC/Iface/Errors/Types.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Types.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Make.hs
• compiler/GHC/Iface/Recomp.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/Linker/Unit.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/HaddockLex.x
• compiler/GHC/Parser/Header.hs
• compiler/GHC/Parser/Lexer.x
• compiler/GHC/Parser/PostProcess.hs
• compiler/GHC/Parser/PostProcess/Haddock.hs
• compiler/GHC/Parser/Types.hs
• compiler/GHC/Platform/Ways.hs
• compiler/GHC/Plugins.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Doc.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.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/Context.hs
• compiler/GHC/Runtime/Debugger.hs
• compiler/GHC/Runtime/Debugger/Breakpoints.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Loader.hs
• compiler/GHC/Stg/BcPrep.hs
• compiler/GHC/Stg/EnforceEpt.hs
• compiler/GHC/Stg/EnforceEpt/Rewrite.hs
• compiler/GHC/Stg/EnforceEpt/TagSig.hs
• compiler/GHC/Stg/EnforceEpt/Types.hs
• compiler/GHC/Stg/Lint.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/Config.hs
• compiler/GHC/StgToCmm/DataCon.hs
• compiler/GHC/StgToCmm/Env.hs
• compiler/GHC/StgToCmm/Foreign.hs
• compiler/GHC/StgToCmm/Lit.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/Ticky.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/Arg.hs
• compiler/GHC/StgToJS/Expr.hs
• compiler/GHC/StgToJS/FFI.hs
• compiler/GHC/StgToJS/Linker/Utils.hs
• compiler/GHC/StgToJS/Utils.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/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Arrow.hs
• compiler/GHC/Tc/Gen/Bind.hs
• compiler/GHC/Tc/Gen/Default.hs
• compiler/GHC/Tc/Gen/Do.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Expr.hs
• compiler/GHC/Tc/Gen/Foreign.hs
• compiler/GHC/Tc/Gen/Head.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Match.hs
• compiler/GHC/Tc/Gen/Pat.hs
• compiler/GHC/Tc/Gen/Sig.hs
• compiler/GHC/Tc/Gen/Splice.hs
• compiler/GHC/Tc/Gen/Splice.hs-boot
• compiler/GHC/Tc/Instance/Class.hs
• compiler/GHC/Tc/Instance/FunDeps.hs
• compiler/GHC/Tc/Instance/Typeable.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Plugin.hs
• compiler/GHC/Tc/Solver.hs
• compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Dict.hs
• compiler/GHC/Tc/Solver/Equality.hs
• compiler/GHC/Tc/Solver/FunDeps.hs
• compiler/GHC/Tc/Solver/InertSet.hs
• compiler/GHC/Tc/Solver/Monad.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/Class.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/Constraint.hs
• compiler/GHC/Tc/Types/Evidence.hs
• compiler/GHC/Tc/Types/LclEnv.hs
• compiler/GHC/Tc/Types/Origin.hs
• compiler/GHC/Tc/Types/Rank.hs
• compiler/GHC/Tc/Utils/Backpack.hs
• compiler/GHC/Tc/Utils/Concrete.hs
• compiler/GHC/Tc/Utils/Env.hs
• compiler/GHC/Tc/Utils/Instantiate.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Arity.hs
• compiler/GHC/Types/Basic.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/GREInfo.hs
• compiler/GHC/Types/Hint.hs
• compiler/GHC/Types/Hint/Ppr.hs
• compiler/GHC/Types/Id/Make.hs
• compiler/GHC/Types/InlinePragma.hs
• compiler/GHC/Types/Literal.hs
• compiler/GHC/Types/Name.hs
• compiler/GHC/Types/Name/Cache.hs
• compiler/GHC/Types/Name/Ppr.hs
• compiler/GHC/Types/Name/Reader.hs
• compiler/GHC/Types/PkgQual.hs
• compiler/GHC/Types/RepType.hs
• compiler/GHC/Types/SourceError.hs
• compiler/GHC/Types/SourceText.hs
• compiler/GHC/Types/TyThing.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/Unique/DFM.hs
• compiler/GHC/Types/Unique/FM.hs
• + compiler/GHC/Types/UnresolvedImport.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Unit.hs
• compiler/GHC/Unit/Env.hs
• compiler/GHC/Unit/External.hs
• + compiler/GHC/Unit/External/Database.hs
• + compiler/GHC/Unit/External/Index.hs
• + compiler/GHC/Unit/External/ModuleOrigin.hs
• + compiler/GHC/Unit/External/Providers.hs
• + compiler/GHC/Unit/External/Query.hs
• + compiler/GHC/Unit/External/Substitution.hs
• + compiler/GHC/Unit/External/Validate.hs
• + compiler/GHC/Unit/External/Visibility.hs
• + compiler/GHC/Unit/External/Wired.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Finder/Types.hs
• compiler/GHC/Unit/Home/Graph.hs
• compiler/GHC/Unit/Info.hs
• compiler/GHC/Unit/Module/Deps.hs
• compiler/GHC/Unit/Module/Env.hs
• compiler/GHC/Unit/Module/ModGuts.hs
• compiler/GHC/Unit/Module/ModIface.hs
• compiler/GHC/Unit/Module/ModSummary.hs
• compiler/GHC/Unit/Module/Warnings.hs
• compiler/GHC/Unit/Module/WholeCoreBindings.hs
• compiler/GHC/Unit/State.hs
• compiler/GHC/Unit/State.hs-boot
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Utils/Binary.hs
• − compiler/GHC/Utils/Binary/Typeable.hs
• compiler/GHC/Utils/Error.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Misc.hs
• compiler/GHC/Utils/Outputable.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/BooleanFormula.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• compiler/Language/Haskell/Syntax/Decls/Foreign.hs
• + compiler/Language/Haskell/Syntax/Doc.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/Expr.hs-boot
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Lit.hs
• compiler/Language/Haskell/Syntax/Module/Name.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• compiler/Language/Haskell/Syntax/Specificity.hs
• + compiler/Language/Haskell/Syntax/Text.hs
• compiler/Language/Haskell/Syntax/Type.hs
• − compiler/Language/Haskell/Syntax/Type.hs-boot
• + compiler/cbits/cpu_features_x86.c
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• docs/index.html.in
• docs/users_guide/bugs.rst
• docs/users_guide/debugging.rst
• docs/users_guide/eventlog-formats.rst
• docs/users_guide/expected-undocumented-flags.txt
• docs/users_guide/exts/qualified_strings.rst
• docs/users_guide/exts/rank_polymorphism.rst
• docs/users_guide/exts/static_pointers.rst
• docs/users_guide/exts/strict.rst
• docs/users_guide/ghc_config.py.in
• docs/users_guide/ghci.rst
• docs/users_guide/javascript.rst
• docs/users_guide/phases.rst
• docs/users_guide/separate_compilation.rst
• docs/users_guide/using-optimisation.rst
• docs/users_guide/using-warnings.rst
• docs/users_guide/using.rst
• ghc/GHC/Driver/Session/Lint.hs
• ghc/GHC/Driver/Session/Mode.hs
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Exception.hs
• ghc/GHCi/UI/Monad.hs
• ghc/Main.hs
• hadrian/README.md
• hadrian/bindist/Makefile
• hadrian/bindist/config.mk.in
• hadrian/build-cabal
• hadrian/cabal.project
• hadrian/cfg/default.host.target.in
• + hadrian/cfg/system.config.host.in
• hadrian/cfg/system.config.in
• + hadrian/cfg/system.config.target.in
• hadrian/hadrian.cabal
• − hadrian/hie-bios
• hadrian/hie-bios.bat
• hadrian/src/Base.hs
• + hadrian/src/BindistConfig.hs
• hadrian/src/Builder.hs
• hadrian/src/CommandLine.hs
• hadrian/src/Context.hs
• hadrian/src/Expression.hs
• hadrian/src/Flavour.hs
• hadrian/src/Flavour/Type.hs
• hadrian/src/Hadrian/Builder.hs
• hadrian/src/Hadrian/Builder/Ar.hs
• hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
• hadrian/src/Hadrian/Haskell/Hash.hs
• hadrian/src/Hadrian/Oracles/Path.hs
• hadrian/src/Hadrian/Oracles/TextFile.hs
• hadrian/src/Hadrian/Utilities.hs
• hadrian/src/Main.hs
• hadrian/src/Oracles/Flag.hs
• hadrian/src/Oracles/Flavour.hs
• hadrian/src/Oracles/Setting.hs
• hadrian/src/Oracles/TestSettings.hs
• hadrian/src/Packages.hs
• hadrian/src/Rules.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
• hadrian/src/Rules/Changelog.hs
• hadrian/src/Rules/Compile.hs
• hadrian/src/Rules/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Gmp.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Nofib.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Register.hs
• hadrian/src/Rules/Rts.hs
• hadrian/src/Rules/SourceDist.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/Common.hs
• hadrian/src/Settings/Builders/Configure.hs
• hadrian/src/Settings/Builders/DeriveConstants.hs
• hadrian/src/Settings/Builders/Ghc.hs
• hadrian/src/Settings/Builders/Hsc2Hs.hs
• hadrian/src/Settings/Builders/RunTest.hs
• hadrian/src/Settings/Builders/SplitSections.hs
• hadrian/src/Settings/Default.hs
• hadrian/src/Settings/Flavours/GhcInGhci.hs
• hadrian/src/Settings/Flavours/Performance.hs
• hadrian/src/Settings/Flavours/QuickCross.hs
• hadrian/src/Settings/Packages.hs
• hadrian/src/Settings/Program.hs
• hadrian/src/Settings/Warnings.hs
• hie.yaml
• 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/Concurrent/Chan.hs
• libraries/base/src/Control/Concurrent/QSem.hs
• libraries/base/src/Control/Concurrent/QSemN.hs
• libraries/base/src/Control/Monad.hs
• libraries/base/src/Data/Array/Byte.hs
• libraries/base/src/Data/Bifoldable.hs
• libraries/base/src/Data/Bifoldable1.hs
• libraries/base/src/Data/Bifunctor.hs
• libraries/base/src/Data/Bitraversable.hs
• libraries/base/src/Data/Bool.hs
• libraries/base/src/Data/Complex.hs
• libraries/base/src/Data/Data.hs
• + libraries/base/src/Data/Double.hs
• libraries/base/src/Data/Enum.hs
• libraries/base/src/Data/Fixed.hs
• + libraries/base/src/Data/Float.hs
• libraries/base/src/Data/Foldable1.hs
• libraries/base/src/Data/Functor/Classes.hs
• libraries/base/src/Data/Functor/Compose.hs
• libraries/base/src/Data/Functor/Contravariant.hs
• libraries/base/src/Data/Functor/Product.hs
• libraries/base/src/Data/Functor/Sum.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/RealFloat.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/Essentials.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/Fingerprint.hs
• libraries/base/src/GHC/IO/Handle.hs
• libraries/base/src/GHC/RTS/Flags.hs
• libraries/base/src/GHC/ResponseFile.hs
• libraries/base/src/GHC/Stack.hs
• libraries/base/src/GHC/Stats.hs
• libraries/base/src/GHC/Unicode.hs
• libraries/base/src/GHC/Weak.hs
• libraries/base/src/GHC/Weak/Finalize.hs
• libraries/base/src/Numeric.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/System/CPUTime/Posix/ClockGetTime.hsc
• libraries/base/src/System/CPUTime/Posix/RUsage.hsc
• libraries/base/src/System/CPUTime/Posix/Times.hsc
• libraries/base/src/System/CPUTime/Unsupported.hs
• libraries/base/src/System/Console/GetOpt.hs
• libraries/base/src/System/Environment.hs
• libraries/base/src/System/Exit.hs
• libraries/base/src/System/IO.hs
• libraries/base/src/System/IO/OS.hs
• libraries/base/src/System/IO/Unsafe.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/src/Text/Show/Functions.hs
• libraries/base/tests/T15349.stderr
• libraries/base/tests/all.T
• libraries/base/tests/listThreads1.hs
• libraries/base/tests/listThreads1.stdout
• libraries/base/tests/perf/ElemFusionUnknownList_O1.stderr
• libraries/base/tests/perf/ElemFusionUnknownList_O2.stderr
• libraries/binary
• libraries/ghc-bignum/changelog.md
• libraries/ghc-boot/GHC/Data/ShortText.hs
• libraries/ghc-experimental/src/Data/Sum/Experimental.hs
• libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
• libraries/ghc-experimental/src/GHC/PrimOps.hs
• libraries/ghc-experimental/src/GHC/Profiling/Eras.hs
• libraries/ghc-experimental/src/Prelude/Experimental.hs
• libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
• libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
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• libraries/ghc-heap/tests/all.T
• libraries/ghc-internal/codepages/MakeTable.hs
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/include/RtsIfaceSymbols.h
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• libraries/ghc-internal/src/GHC/Internal/Arr.hs
• libraries/ghc-internal/src/GHC/Internal/ArrayArray.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/GMP.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
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• libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs-boot
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• libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Bignum/Primitives.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/WordArray.hs
• libraries/ghc-internal/src/GHC/Internal/Bits.hs
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• 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
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• 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/POSIX/Const.hsc
• libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
• libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
• libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Category.hs
• libraries/ghc-internal/src/GHC/Internal/Control/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.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Monad/Zip.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Coerce.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Dynamic.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
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• libraries/ghc-internal/src/GHC/Internal/ExecutionStack/Internal.hsc
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• 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
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• libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
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• libraries/ghc-internal/src/GHC/Internal/Lexeme.hs
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• libraries/ghc-internal/src/GHC/Internal/Windows.hs
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• libraries/ghc-internal/tests/backtraces/T14532b.stdout
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• libraries/process
• libraries/semaphore-compat
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• rts/Messages.c
• rts/PrimOps.cmm
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• rts/ProfHeap.c
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• rts/RaiseAsync.c
• rts/RaiseAsync.h
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• rts/win32/Ticker.c
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• testsuite/tests/profiling/should_compile/all.T
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• testsuite/tests/profiling/should_run/caller-cc/CallerCc1.prof.sample
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• testsuite/tests/profiling/should_run/scc001.prof.sample
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• testsuite/tests/rename/should_compile/T3103/GHC/Base.lhs
• testsuite/tests/rename/should_compile/T3103/GHC/Word.hs
• testsuite/tests/rename/should_compile/T3103/test.T
• testsuite/tests/rename/should_compile/T4239.stdout
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• testsuite/tests/simd/should_run/doublex2_fma.hs
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• testsuite/tests/simplCore/should_compile/DataToTagFamilyScrut.stderr
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• testsuite/tests/simplStg/should_compile/all.T
• testsuite/tests/simplStg/should_compile/inferTags004.hs
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• testsuite/tests/splice-imports/all.T
• testsuite/tests/tcplugins/ArgsPlugin.hs
• testsuite/tests/tcplugins/EmitWantedPlugin.hs
• testsuite/tests/tcplugins/RewritePlugin.hs
• testsuite/tests/tcplugins/T26395_Plugin.hs
• testsuite/tests/tcplugins/TcPlugin_RewritePerf.hs
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• testsuite/tests/tcplugins/TyFamPlugin.hs
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• + testsuite/tests/th/TH_pragmaSpecOld.hs
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• testsuite/tests/th/all.T
• testsuite/tests/typecheck/should_compile/DeepSubsumption02.hs
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• testsuite/tests/typecheck/should_compile/T12507.hs
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• testsuite/tests/typecheck/should_compile/all.T
• testsuite/tests/typecheck/should_compile/holes.stderr
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• testsuite/tests/typecheck/should_fail/all.T
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• testsuite/tests/typecheck/should_run/T1735_Help/Basics.hs
• testsuite/tests/typecheck/should_run/T22510.stdout
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• testsuite/tests/typecheck/should_run/tcrun036.hs
• testsuite/tests/unboxedsums/UbxSumLevPoly.hs
• testsuite/tests/unboxedsums/unboxedsums_unit_tests.hs
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• testsuite/tests/vdq-rta/should_compile/all.T
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• testsuite/tests/vdq-rta/should_fail/all.T
• testsuite/tests/warnings/should_compile/DerivingTypeable.stderr
• utils/check-exact/ExactPrint.hs
• utils/check-exact/Main.hs
• utils/check-exact/Parsers.hs
• utils/check-exact/Preprocess.hs
• utils/check-exact/Transform.hs
• utils/check-exact/Utils.hs
• utils/check-exact/check-exact.cabal
• utils/check-ppr/Main.hs
• utils/deriveConstants/Main.hs
• utils/genprimopcode/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Utils.hs
• utils/haddock/CONTRIBUTING.md
• utils/haddock/haddock-api/haddock-api.cabal
• utils/haddock/haddock-api/src/Haddock.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/DocMarkup.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Meta.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Names.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Convert.hs
• utils/haddock/haddock-api/src/Haddock/Doc.hs
• utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
• utils/haddock/haddock-api/src/Haddock/Interface.hs
• utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Json.hs
• utils/haddock/haddock-api/src/Haddock/Interface/LexParseRn.hs
• utils/haddock/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
• utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
• utils/haddock/haddock-api/src/Haddock/Options.hs
• utils/haddock/haddock-api/src/Haddock/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/haddock-api/src/Haddock/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json/Parser.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json/Types.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Doc.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Markup.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Parser.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Parser/Util.hs
• utils/haddock/haddock-library/src/Documentation/Haddock/Types.hs
• utils/haddock/haddock-library/test/Documentation/Haddock/ParserSpec.hs
• utils/haddock/haddock-test/haddock-test.cabal
• utils/haddock/haddock-test/src/Test/Haddock/Config.hs
• utils/haddock/html-test/ref/Hash.html
• utils/haddock/html-test/ref/Test.html
• utils/haddock/html-test/ref/TypeFamilies3.html

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