Simon Jakobi pushed to branch wip/sjakobi/T27619-liveness-fixpoint-formats at Glasgow Haskell Compiler / GHC

Commits:

• 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
  

• d1d01fa5
  by Wolfgang Jeltsch at 2026-08-27T13:17:59+03:00

  Add `rethrowSTM` and improve STM-related documentation
  
  Adding `rethrowSTM` resolves #26758.
  
  The implementation of `rethrowSTM` is completely analogous to the one of
  `rethrowIO`.
  
  The following is established for the documentation of `throwSTM` and
  `catchSTM`:
  
    * Both operations are directly described as analogs of their `IO`
      counterparts.
  
    * There is no reference to `throw` in the documentation of `throwSTM`,
      because, although such a reference is great in the documentation of
      `throwIO`, it is somewhat out of place in the documentation of
      `throwSTM`.
  
    * Instead of repeating part of `throwIO`’s documentation, the
      documentation of `throwSTM` just recommends using `throwSTM` instead
      of `throw` and references the corresponding arguments in the
      documentation of `throwIO`.
  

• 06fde293
  by fendor at 2026-08-28T06:06:44-04:00

  GHCi: Fix order of `PackageDBFlag`s for interactive home unit
  
  `PackageDBFlag`s are stored in reverse order of cli specification.
  When sorting the `PackageDBFlag`s by longest common prefix, we need thus
  to reverse the package db stacks before calculating the prefix.
  We make sure to reverse the package db stack for the interactive home
  unit to uphold that later specified package dbs overwrite earlier ones.
  
  Resolved and adds regression test for #27640
  

• 024c4d04
  by fendor at 2026-08-28T06:07:23-04:00

  Reuse the UnitIndexCache after initialising multiple home units
  

• 55326fa0
  by Alan Zimmerman at 2026-08-28T06:08:03-04:00

  EPA: Some Haddock processing tweaks
  
  These changes to the Haddock postprocessing should not change
  behaviour, but just bring it more closely in line with the
  original, changed at 44309cd377f
  
  And add some haddock exactprint tests to show they work.
  

• b3ddee95
  by Andreas Klebinger at 2026-08-28T13:57:46-04:00

  hadrian: Deprecate quickest flavour.
  
  It was more of a trap for new users than actually beneficial so we
  deprecate it and suggest quick+no_dynamic_libs to users instead.
  

• a1d81390
  by Andreas Klebinger at 2026-08-28T13:58:37-04:00

  cmm: Always favour entry block during block deduplication.
  
  We now always keep the first block in the CmmGraph. This way we avoid
  the need to update the entry info table.
  
  Failing to do so caused #27722.
  
  Fixes #27722.
  

• 5bd65f00
  by Andreas Klebinger at 2026-08-28T13:59:16-04:00

  test: FamAppCachePerf - Only collect bytes allocated. Fixes 27747
  

• ced53ce6
  by mangoiv at 2026-08-29T07:15:24-04:00

  nightlies: output yaml to file only
  
  Previously we would just output the metadata to stdout
  which risks that it's clobbered by incidental debugt output.
  We now output to file only.
  
  Fixes #27511
  

• 578bd185
  by Andreas Klebinger at 2026-08-29T07:16:05-04:00

  Specialise: Stop looping on recursive dictionaries in interestingDict
  
  interestingDict now doesn't look through loopbreaker unfoldings.
  Doing so would cause infinite loops on certain dictionaries.
  
  Fixes #27705.
  

• 7bf546fc
  by Simon Peyton Jones at 2026-08-31T23:48:53-04:00

  Never make an absent filler for a constraint type
  
  mkAbsentFiller used isTerminatingType to decide, but that is not enough.
  Consider
  
      class Eq a => UC a where {}
  
      let u :: UC Int           -- UC Int is a "non-terminating type"
          u = error "Absent"
      let e :: Eq Int           -- Eq Int is a "terminating type"
          e = $p1UC u
  
  We clearly must not make a filler for `e`, because we speculatively
  evaluate it. But speculatively evaluating `e` forces `u`, so we must not
  make one for `u` either.
  
  Asking isDictTy instead is not enough either, because it does not catch a
  constraint hidden behind an unreduced type family application:
  
      type family F a :: Constraint
      type instance F W = TC W
  
      a :: F W => Int -> Int      -- (F W) argument is absent
  
      Oops!  Entered absent arg Arg: irred
      Type: F W
  
  So play safe and use isPredTy: never make an absent filler for any
  constraint-kinded type.
  
  Fixes #27627
  

• 5f474953
  by Zubin Duggal at 2026-08-31T23:48:53-04:00

  Add tests for absent fillers at dictionary types
  
  T27627   a unary class whose superclass is a non-unary class
  T27627a  ...whose superclass is a Constraint-kinded type family
  T27627b  ...whose superclass is a quantified constraint
  T27627c  a unary class applied to itself, (UC (UC (TC a)))
  T27627e  a (forall b. P b) dictionary that loops
  

• cd5c6bcc
  by Zubin Duggal at 2026-08-31T23:48:53-04:00

  An abstract TyCon may hide a unary class
  
  A class declared in an hs-boot file is an AbstractTyCon inside the
  module loop, and compiling the real declaration may reveal it to be a
  UnaryClassTyCon.
  
  - isTerminatingType returned True for such AbstractTyCons
  
  - IfaceToCore set the unary flag to False in the DFunId
  
  So we could end up speculating bottom dictionaries because inside a module
  loop we see an UnaryClassTyCon as an AbstractTyCon
  
  Use isTerminatingTyCon, which returns False for an abstract TyCon.
  
  The Bool in DFunId is now a cache for isTerminatingTyCon, set in
  mkDFunIdDetails.
  
  Fixes #27704
  

• abfc224a
  by Zubin Duggal at 2026-08-31T23:48:53-04:00

  Specialise: don't replace dead args with absent fillers
  
  specHeader decides an argument is dead by calling isDeadBinder on a binder of
  the /optimised RHS/, then applies the filler to the /stable unfolding/
  template instead. The two may differ, so the argument can be dead in
  the RHS and not in the template.
  
  The specialised function's unfolding then has an absent filler, and any call
  site that inlines it evaluates the error thunk.
  
  Dropping dead args in the specialiser is rarely worth it, to quote Simon,
  "The later worker/wrapper pass will pick up the dead arg later if it is really dead. Keeps the specialiser simpler."
  
  So instead of trying to check if the arg really is dead in the stable unfolding,
  just drop the logic for dropping dead args in the specialiser altogeher.
  
  Fixes #27703
  

• 1557fd1c
  by Zubin Duggal at 2026-08-31T23:48:53-04:00

  CorePrep: don't speculate a call across an hs-boot edge
  
  We take care not to evaluate things that might be bottom, like a
  looping dictionary group, but our analysis is defeated by boot files.
  We only track recursion within a module, so two dictionaries that
  depend on each other across a module loop each look non-recursive, and
  we might speculate them.
  
  Any recursion we cannot see must cross an hs-boot edge, so refuse to
  speculate calls that cross one.
  
  Fixes #27717
  

• 4117e5ae
  by Wolfgang Jeltsch at 2026-08-31T23:49:35-04:00

  Incorporate the `rethrowSTM` reexport into the `stm` submodule
  

• 4bfbf5c8
  by ARATA Mizuki at 2026-09-01T18:55:08-04:00

  testsuite: Fix out-of-bounds access in T3586
  
  unsafeRead and unsafeWrite use 0-based index.
  
  Looking at #3586, the expected output seems to be 2.8e8.
  
  Addresses #27596
  

• 3f9db6d4
  by ARATA Mizuki at 2026-09-01T18:55:08-04:00

  testsuite: Fix out-of-bounds access in T21305
  
  writeInt64Array# takes an index measured in units of Int64 elements.
  
  Fixes #27596
  

• 44d7788f
  by Simon Peyton Jones at 2026-09-01T18:55:53-04:00

  Fix buglet in INLINE-arity calculation for pattern synonyms
  
  This fixes #27744.
  
  The buglet was accidentally introduced by
  
    commit 3a0f9a51c1dacc474c7fd128082edd8bf4081256
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Sat Aug 1 00:13:02 2026 +0100
  
      Fix three bugs related to required type args and INLINE pragmas
  
  I failed to find all the calls to `addInlinePragArity`!
  

• df058f1d
  by Simon Jakobi at 2026-09-02T07:18:06-04:00

  testsuite: Migrate perf tests off collect_compiler_stats('all')
  
  The 'all' metric argument applies a single tolerance to bytes
  allocated, max_bytes_used and peak_megabytes_allocated, although their
  noise profiles are incompatible (#27653): allocations are nearly
  deterministic, residency needs 10-20%, and peak is quantized to 1 MB.
  Any single tolerance is too tight for one metric or too slack for
  another. This migrates the remaining users of 'all' (and of the 'all'
  default) to explicit per-metric collection, ahead of removing 'all'
  from the driver.
  
  peak_megabytes_allocated is dropped everywhere: its 1 MB granularity
  makes tight relative windows meaningless (#27613), and it is sensitive
  to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved
  by less than 0.1%. Where a test guards a memory property,
  max_bytes_used covers it at byte granularity.
  
  Where the motivating ticket was about compile-time memory
  (T11545, T15304, T26425), residency remains gated via max_bytes_used,
  now with a residency-appropriate tolerance.
  
  max_bytes_used is dropped where residency was only ever an accident of
  'all':
  
  * T15630, T15630a, T20261: the underlying tickets (#15630, #20261)
    contain no memory data at all. One is a simplifier-ticks blowup and
    the other is stated entirely in allocation numbers, so the 20%
    window never had teeth.
  
  * T21839c: #21839's measurements show residency essentially flat
    (+0.16%) while allocations moved +7%, so allocations are the
    discriminating metric. They are already gated at 1% via
    collect_compiler_runtime. The ghc/max gate had previously broken CI
    spuriously (9fd11585eb widened it from 1% to 10% for that reason).
  
  Allocation tolerances are tightened to the testsuite's conventional 2%
  where 'all' previously left them at 10-20%.
  
  Assisted-by: Claude Fable 5
  

• 72dd2432
  by Simon Jakobi at 2026-09-02T07:18:06-04:00

  testsuite: Remove the 'all' metric argument of collect_stats
  
  'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated
  at a single tolerance, although their noise profiles are incompatible,
  making such tests either flaky or toothless (#27653).
  
  Closes #27653.
  
  Assisted-by: Claude Fable 5
  
  
  

• 2228cb30
  by Simon Jakobi at 2026-09-02T07:18:06-04:00

  testsuite: Make the deviation argument of collect_stats mandatory
  
  Almost every caller passes an explicit tolerance matched to the
  metric's noise profile, and the silent 20% default is far slacker than
  'bytes allocated' merits. Only two tests relied on it. They now state
  their tolerance explicitly:
  
  large-project gets 10%, in line with other large compile-time tests.
  
  T9848 gets 2%: its metric is byte-for-byte deterministic across CI
  jobs and platforms of a given test_env, has drifted only about 2.5%
  since 2015, and the fusion failure it guards against would show up as
  a roughly +30000% jump.
  
  Assisted-by: Claude Fable 5
  
  
  

• 56291fc5
  by Cheng Shao at 2026-09-02T07:18:45-04:00

  autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23
  
  This commit bumps llvm upper bound to support llvm 23.
  

• 20eb3f41
  by Cheng Shao at 2026-09-02T07:18:45-04:00

  rts: fix compilation issues with clang 23
  
  clang 23 has broadened `-Wall`/`-Wextra` ranges, exposing some minor
  issues in the rts when building with validate flavours:
  
  - Unused locals
  - `#pragma GCC diagnostic pop` mismatch
  
  This commit fixes those.
  

• 9e7739ab
  by Simon Jakobi at 2026-09-03T13:45:43-04:00

  Add -Wimplicit-field-strictness (#16836)
  
  This opt-in warning fires when a data constructor field lacks an
  explicit strictness annotation (`!` or `~`).  It complements the
  LazyFieldAnnotations extension (4762a8bf30f) from GHC proposal 752,
  which makes `~` annotations available for this purpose.
  
  Deciding which fields to report requires their levity, so the check
  runs after typechecking.  To keep the noise down, the diagnostic is
  emitted once per data declaration, grouped by constructor.
  
  Closes #16836.
  
  Assisted-by: Claude Fable 5
  

• 6a44d591
  by mangoiv at 2026-09-03T13:46:22-04:00

  simplifier: remove a bogus `assert` in `rebuild_app'` in `GHC.CoreToStg.Prep.cpeApp`.
  
  Prior to this commit
      commit 08bc245be70d95801bc1138804ed1de9474fbdc0
      Author: sheaf <sam.derbyshire@gmail.com>
      Date:   Sat Feb 28 16:30:43 2026 +0100
  
      Clean up join points, casts & ticks
  
      This commit shores up the logic dealing with casts and ticks occurring
      in between a join point binding and a jump
  
  any `PlaceRuntime` ticks we observed were profiling ticks, even though that
  isn't necessary.
  The more liberal rules in the above commit allow e.g. breakpoint ticks
  (which are valid PlaceRuntime ticks) to legitimately appear in an argument
  position.
  
  Fixes #27556
  

• eaa95a6f
  by Andrei Borzenkov at 2026-09-04T08:08:40-04:00

  Parentheses in prefix GADT constructors (#27423)
  
  Updated `splitLHsGadtTy` to allow looking
  through the parentheses for inner binders. General example
  of a code pattern that's allowed now:
  
    data S a where
      MkS :: (forall a. S a)
  
  That should work now with any combination of nested
  foralls and parentheses.
  
  We don't perform parenthesis unwrapping for record
  GADT constructors in accordance with GHC Proposal #402.
  
  To this end `con_inner_bndrs` no longer stores plain forall
  telescopes: `[HsForAllTelescope pass]` is replaced with
  `[LHsGadtTelescope pass]`, a new `HsArg`-style type whose
  `HsGadtForAll` holds an inner telescope and whose `HsGadtPar`
  holds a pair of parentheses. The parentheses carry no meaning
  for renaming or type checking; the only reason to record them
  is exact-printing.
  
  Updated `pprConDecl` to improve the `parse == parse . ppr . parse`
  property of GADT pretty-printing.
  
  The pretty printer can now output code that's similar to this:
  
    data T a where
      MkT1 :: (forall a. T a)
      MkT2 :: forall . forall a. T a
  
  These are special cases of inner forall binders
  for prefix GADT constructors, when we have either
  implicit or zero explicit outer binders.
  

• 639456a8
  by Evgeny Malyshev at 2026-09-04T08:09:25-04:00

  HsPat: Add spacing to unary tuple patterns
  
  Use hsep when printing unary boxed TuplePat applications so that the
  MkSolo constructor is separated from its argument. The old hcat rendered
  wildcard and parenthesized arguments as MkSolo_ and MkSolo().
  
  Add T27034 to exercise the HsPat splice-dump path with wildcard and
  variable arguments, and update existing affected golden output.
  
  Fixes #27034
  
  Assisted-By: OpenAI Codex
  

• 2908ab36
  by Simon Jakobi at 2026-09-05T07:22:17-04:00

  X86 NCG: use btr/bts/btc for single-bit operations
  
  Previously the Cmm patterns
  
    x & ~(1 << i)
    x | (1 << i)
    x ^ (1 << i)
  
  compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now
  they compile to a single btr, bts or btc, matching what C compilers
  produce.
  
  When the bit index is a literal, constant folding has already collapsed
  these patterns into ones with a literal mask, such as
  x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also
  compiled to a bit-test instruction when they don't fit in an imm32 and
  would otherwise have to be loaded into a register first.
  
  For a variable bit index, this applies only when the shift is unchecked
  (uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL
  used by e.g. the default clearBit/setBit/complementBit implementations
  wraps the shift in a bounds mask that this optimisation does not see
  through. With a literal index, the bounds mask is constant-folded away,
  so the checked operations benefit too.
  
  See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen.
  
  Fixes #25233.
  
  Assisted-by: Claude Fable 5
  

• c673ecf0
  by Simon Peyton Jones at 2026-09-05T07:22:59-04:00

  Move HsStatic free-var test to typechecker
  
  A `static` form should have no free *term* variables, but it
  can have free *type* variables.  Alas, the renamer does not really know what
  is a term variable and what is a type variable, because of required type
  arguments. This patch moves the test to the typechecker, which does know.
  
  Addresses #27664
  

• 5939ceaf
  by sheaf at 2026-09-05T22:06:18-04:00

  Windows: enforce path convention in ./configure
  
  As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing
  convention (using Windows-style paths with forward slashes) is now
  enforced in ./configure instead of within Hadrian, removing the need for
  'cygpath' calls within Hadrian.
  
  Fixes #26683
  

• a6061455
  by sheaf at 2026-09-05T22:06:18-04:00

  Hadrian: introduce ExeSpawnPath
  
  Specific details about the filepath used to specify the executable to
  spawn with CreateProcess matters on Windows: whether we use forward or
  backward slashes, a leading ./, or an absolute path changes how the
  executable is found.
  
  This commit introduces 'ExeSpawnPath' which is a path that is guaranteed
  to be found when spawning a process. All command invocations now go
  through this type to ensure the path has been properly sanitised.
  
  See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities.
  
  The same treatment is applied to hsc2hs. Updates hsc2hs submodule.
  

• e28313e3
  by sheaf at 2026-09-05T22:07:06-04:00

  Preserve tick ordering in 'tickTickedExpr'
  
  'GHC.Core.Utils.tickTickedExpr' tries to combine a tick 't1' into an
  existing stack of ticks 't2s'. There are two situations:
  
    1. 't1' is subsumed by a tick in 't2s': drop it.
    2. A tick in 't2s' is subsumed by 't1', say 't2'.
  
  This commit ensures that in case (2) we keep 't1' on the outside instead
  of replacing 't2' at its position in the stack. This avoids re-ordering
  source notes (which was the cause of #27749).
  
  This fixes a regression introduced in 2dadf3b0d05.
  
  Fixes #27749
  

• 3172f557
  by sheaf at 2026-09-05T22:07:06-04:00

  Consistently prefer local source note ticks
  
  GHC.Cmm.DebugBlock.cmmDebugGen (DWARF annotations) and
  GHC.Stg.Debug.quickSourcePos (-finfo-table-map) both contained logic to
  prioritise source note ticks from the current module.
  
  This commit commons up this logic and propagates it to a third consumer:
  IPE stack frames, in GHC.Driver.GenerateCgIPEStub.
  See the new function GHC.Types.Tickish.bestSourceNote.
  

• 192be0b6
  by Luite Stegeman at 2026-09-07T19:43:36-04:00

  rts: fix ctoi_tuple_spill_words getting out of sync
  
  Fix a few places that were not updating ctoi_tuple_spill_words
  correctly, leading to corruption/crashes when dealing with large
  unboxed tuples in bytecode:
  
   - captureContinuationAndAbort
   - findRetryFrameHelper/findAtomicallyFrameHelper
   - interpretBCO bci_BRK_FUN
  
  fixes #27633
  

• 604eb43c
  by Simon Jakobi at 2026-09-07T19:44:15-04:00

  Hadrian: don't capture the testsuite driver's output (#27780)
  
  a6061455d54 switched the Testsuite RunTest case from Shake's cmd to the
  cmd' wrapper. cmd' always captures stdout and stderr, and since the
  caller asks for Exit, it returns without dumping what it captured. As a
  result the testsuite output no longer appears in CI job logs: failures,
  performance metrics and the summary were lost with the job.
  
  Use cmdExe, the uncaptured cmd, as the other plain-cmd sites in that
  commit do.
  
  Fixes #27780.
  
  Assisted-by: Claude Fable 5.1
  

• 06eee015
  by Luite Stegeman at 2026-09-08T06:03:06+02:00

  rts: Fix missing memory barrier in eval_thunk_selector (#27477)
  
  unchain_thunk_selectors() was missing an ACQUIRE_LOAD for the
  indirectee, leading to segfaults and corruption during GC on
  weakly-ordered architectures.
  
  Fixes #27477
  

• f8b2bd8f
  by Alan Zimmerman at 2026-09-08T09:39:12-04:00

  EPA Fix HsCmdDo exact print with comments
  
  Exact printing of HsCmdDo was ignoring the location for the do
  statements, and this is an annotation that can have comments in it.
  
  Update it so we print the statements as a unit, including any
  comments.
  
  Also add the result of auditing that we capture comments in all needed
  places, noting that the remaining Anno SrcSpan instances are benign.
  

• 430967ab
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Reorder cmm decls in HeapStackCheck for a better logical grouping
  
  And put more section headers in to deliniate the groups.
  
  We're about to add more here, so better to organise it first.
  

• 344080fd
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Add raisePrimIOException and add it to RTS<->ghc-internal API
  
  The raisePrimIOException is a new helper function that I/O primops will
  use to help them report I/O errors. This is implemented in Haskell
  (since that's a lot easier), but has a calling convention that is
  easy(ish) to use from Cmm in the I/O primops.
  
  So we add it to the RTS API struct, and since we'll use it from Cmm we
  also need a field accessor macro for cmm (in deriveConstants).
  
  See the Note about how we cannot have nice things due to async
  exceptions and thunks preventing us from using catch.
  

• cfdb3399
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Add new blocking functions for I/O primops
  
  See the Note [Thread blocking for new I/O primops],
  and the Note [Calling convention for raisePrimIOException].
  
  The point is, it will allow us to report synchronous exceptions from I/O
  primops, and do so much more flexibly.
  
  Previously the I/O managers could only report async exceptions and only
  nullary exceptions. This was OK historically, but no good as we add
  more I/O managers and expand the range of I/O operations we support.
  

• f09c09d8
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Change the encoding of results from the I/O manager to I/O primops
  
  Previously we just had async continue or heap overflow.
  
  We now extend what we can report with synchronous success, and
  synchronous failure with an errno.
  
  See Note [Encoding of result of I/O manager operations]
  
  We don't use these two new cases yet, but we will. In particular an
  epoll I/O manager needs to be able to report synchronous success or
  failure for waitRead#/waitWrite#.
  

• 30f074d9
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Switch waitRead/Write# to use new blocking return frames
  
  and update the I/O managers to set the result before resuming the
  blocked threads.
  
  This makes it possible for I/O managers to report synchronous exceptions
  from the I/O primops, but that will be done in a subsequent commit.
  

• a8786ced
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Switch Poll and Select I/O managers to report sync exceptions
  
  rather than using raiseAsync with blockedOnBadFD_closure.
  
  This uses the new mechanism in the blocking frame return code to report
  synchronous exceptions.
  

• 7a9df79a
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Remove now-unused blockedOnBadFD
  
  It was previously thrown by the select and poll I/O managers, but now
  they use raisePrimIOException (with an EBADF errno).
  

• 6b0424e3
  by Duncan Coutts at 2026-09-09T11:07:01+01:00

  Improve the docs for delay# waitRead# and waitWrite#
  
  Document that the waitRead/Write# can throw exceptions (this was true
  before too), and that all of them are async exception cancellation
  points.
  

• afeb2c30
  by Duncan Coutts at 2026-09-09T20:08:58-04:00

  Enable printf warnings for trace functions and fix resulting warnings
  
  Most of the existing printf-style functions are annotated with
  attributes to enable gcc/clang warnings for the printf format string,
  but several trace functions in Trace.h were missing this annotation.
  
  Enable them, and fix the resulting warnings.
  

• 9a442c93
  by Alan Zimmerman at 2026-09-09T20:09:36-04:00

  EPA: Exact print ConDeclGADT without custom enterAnn
  
  !16321 brought in explicit capture of parens in a ConDeclGADT.
  
  The ExactPrint update introduced a modification of the fundamental
  function in exact printing, `enterAnn`, by splitting it into a version
  allowing injection of functionality normally handled by the
  ExactPrint class methods.
  
  This commit refactors that code, to restore the prior `enterAnn`
  version, by following the convention in ExactPrint of introducing a
  helper data structure with its own `ExactPrint` instance to achieve
  the same effect.
  

• 4e9297ea
  by Simon Jakobi at 2026-09-11T08:32:45-04:00

  ci: Actually pass --ignore-perf-failures to the testsuite driver
  
  684c0018d9 changed the IGNORE_PERF_FAILURES handling to append to
  RUNTEST_ARGS with bash array syntax, but the three use sites still
  expand RUNTEST_ARGS as a scalar, which yields only the first array
  element. The appended flag was therefore dropped in every job, so
  perf improvements kept failing Marge Bot batches and master pipelines,
  contrary to #19562.
  
  Append as a string instead, matching the existing --force-colors
  append in test_hadrian.
  
  Fixes #27563.
  
  Assisted-by: Claude Fable 5.1
  

• 4f78dfdf
  by Simon Jakobi at 2026-09-11T08:33:24-04:00

  testsuite: Give T26537 a 1.5x compile timeout
  
  Its -fregs-graph compile step tends to time out in unoptimized builds
  (#27188, #27776).
  
  Assisted-by: Claude Fable 5.1
  

• 130286e3
  by Alan Zimmerman at 2026-09-11T08:34:08-04:00

  EPA: Remove ListBanana / ListParens from AnnListBrackets
  
  This is a step towards making AnnList only represent
  lists of items which can have either braces or layout.
  

• a9827d13
  by Simon Jakobi at 2026-09-11T18:53:32-04:00

  Reject ~, UNPACK and multiplicity annotations on type data fields
  
  Only `!` was rejected so far. `~`, UNPACK and multiplicity annotations
  were silently accepted. None of them make sense at the type level, so
  restriction (R3) of Note [Type data declarations] now covers all of
  them.
  
  Fixes #27732.
  
  Assisted-by: Claude Fable 5.1
  

• c71d5e23
  by Alan Zimmerman at 2026-09-11T18:54:11-04:00

  EPA: Add a Note for the exact print main loop
  

• 7a108e43
  by Simon Jakobi at 2026-09-12T18:35:59-04:00

  FastString: Drop mkFastStringWith's constructor callback
  
  All three callers passed the same callback, a partial application of
  mkNewFastStringShortByteString to the string being interned. That
  partial application is allocated as a closure before the table lookup,
  on the common hit path too, although the callback is needed only after
  a miss.
  
  Drop the parameter and call mkNewFastStringShortByteString directly
  after a miss. Since nothing is passed "with" anymore, rename the
  function to internSB.
  
  Suggested by Simon PJ in #27528:
  https://gitlab.haskell.org/ghc/ghc/-/work_items/27528#note_687031
  
  Assisted-by: Claude Fable 5
  

• 82c73b22
  by Alan Zimmerman at 2026-09-12T18:36:38-04:00

  EPA: More targeted HsDo exact print annotation
  
  HsDo is multi-purpose, as encoded in its HsDoFlavour field. Some of
  these are in a layout context (DoExpr, MDoExpr), others are not
  (ListComp, MonadComp).
  
  We are moving towards using AnnList only in layout contexts, so we
  switch the HsDo TTG annotation from holding an AnnList for this, to
  holding
  
    Either (EpToken "[", EpToken "]") AnnList
  
  This also allows us to trim down AnnListBrackets to only have braces
  or None, thereby opening the door for unification with the existing
  layout context data type EpLayout.
  

• 749d2448
  by Luite Stegeman at 2026-09-15T14:07:01-04:00

  rts: handle large CONSTR 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  1
  
  Closure type 1 is CONSTR. This patch adds cases for CONSTR and
  CONSTR_NOCAF.
  
  This is the same problem as #27434 (large AP closures, fixed by
  cca0d58963), which missed this case.
  
  Fixes #27649
  

• 177d6155
  by Luite Stegeman at 2026-09-15T14:07:02-04:00

  testsuite: fix T27434 test with compacting GC
  
  Ensure that the interpreter is actually run with the compacting GC
  

• 5796aa63
  by Luite Stegeman at 2026-09-15T14:07:49-04:00

  rts: initialise the stack frame header for mask_frame and apply_mask_frame
  
  We must leave the stack in consistent state before jumping to
  mask_frame or apply_mask_frame because they may result. Failing
  to do so could lead to a crash if there were waiting exceptions.
  
  Fixes #27651
  

• 2486cc92
  by Simon Peyton Jones at 2026-09-15T14:08:36-04:00

  Re-introduce the "weird SpecDict" case
  
  In this commit
  
      commit f80375dd4945350a1d784e436975b48b9c736eaf
      Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
      Date:   Sun Jun 29 15:26:58 2025 +0100
  
        Refactor of Specialise.hs
  
  I removed a test for a dictionary with unbound type variables.  This
  turned out to be wrong; see #27629.
  
  So this MR re-introduces it.
  

• 8e09a46f
  by Duncan Coutts at 2026-09-15T20:11:35-04:00

  Refactor (and rename) removeFromQueues, to simplify I/O managers
  
  Rename it to unblockAndAppendToRunQueue which better reflects what it is
  intended to do.
  
  The post-condition for unblockAndAppendToRunQueue is that the TSO is on
  the run queue or it is in the process of migrating to another cap.
  Previously it achieved that by always directly adding the TSO to the run
  queue itself.
  
  But this actually made things more complicated for the I/O managers,
  because it meant they needed a separate code path for notifying for
  cancellation compared to notifying for completion. The general
  notification code would always add the TSO to the run queue itself.
  
  So the improvement is to allow different cases in
  unblockAndAppendToRunQueue to achieve the same outcome in different
  ways: either directly adding to the run queue or calling helper
  functions that do so themselves.
  
  This then allows the new I/O managers to share code between the sync and
  async cancellation, and to reuse their notifyIOCompletion helpers for
  cancellation. This avoids a source of bugs where the completion path may
  be updated but the cancellation path may be forgotten, or similarly in
  future for sync/async operations.
  
  Update all the existing in-RTS I/O managers, and the posix timeout code.
  

• d668782c
  by Duncan Coutts at 2026-09-15T20:11:35-04:00

  Document that awaitCompletedTimeoutsOrIO expects an empty run queue
  
  This was true before but implicit and not relied on much. It's better to
  be explicit, and allow things to depend on it.
  

• 11d938bb
  by Duncan Coutts at 2026-09-15T20:11:35-04:00

  Store the I/O opcode and fd in the StgAsyncIOOp
  
  This will be useful in several I/O managers and it is handy for logging
  and debugging.
  
  It also doesn't increase the size of the StgAsyncIOOp structure. There
  was enough spare padding space already.
  
  Update the poll I/O manager to set the new fields.
  
  Add a helper function to convert the enum IOReadOrWrite into the enum
  IOOpCode. Also change IOReadOrWrite to be an enum without a typedef, for
  consistency with other enumerations in IOManager.h
  

• bfa87882
  by Duncan Coutts at 2026-09-15T20:11:36-04:00

  Add a new I/O manager based on select()
  
  Yes, this is the second such I/O manager, but it is a modern
  re-implementation based on the new in-RTS I/O manager infrastructure. So
  it is cleaner and faster than the old select I/O manager.
  
  Why do we need another I/O manager based on select? Why isn't the poll()
  one good enough as a baseline portable unix I/O manager? Because macOS.
  Apple Inc. is why we cannot have nice things.
  
  The man page for poll on macOS documents the fact that it does not work.
  At least, it does not work for all files. Specifically, it does not work
  for device files. Whereas macOS select() does work for device files.
  Aaaaarg!
  
  We _do_ want to deprecate and remove the old select I/O manager, but due to
  macOS we cannot do that until we have a replacement. This is that
  replacement. Until of course a nice new k-queue I/O manager arrives,
  which could become the new default for macOS and FreeBSD.
  
  Interestingly, this select I/O manager is actually faster than the poll
  one, on Linix, in some circumstances: specifically when many Haskell
  threads are waiting on the same fd. The poll I/O manager does O(n) work
  for n threads waiting on I/O, whereas the select one does O(fds) work
  for the number of fds that threads are waiting on. Usually this is 1:1,
  so it's not noticable, but one can concoct extreme benchmarks to show
  the difference.
  

• 8e9de15a
  by Duncan Coutts at 2026-09-15T20:11:36-04:00

  Minor updates in the poll I/O manager to keep in sync with select
  
  This keeps it in sync with select one. The changes are based on code review
  while implementing the new select I/O manager. The two I/O managers are so
  similar in structure that it makes sense to try to minimise the diff between
  them. This should aid understanding, and fixes to both in future.
  

• 222668bb
  by Duncan Coutts at 2026-09-15T20:11:36-04:00

  Document the new select I/O manager in the user guide
  
  in the RTS section about I/O managers.
  
  And add a changelog entry.
  

• 0f48735b
  by Cheng Shao at 2026-09-15T20:12:23-04:00

  Revert "wasm: workaround WebKit bug in dyld"
  
  This reverts commit c9b8465c2c338176fcab9d197e9d31f4aee11f68. The
  underlying webkit bug has been fixed in
  https://commits.webkit.org/314219@main. Closes #27564.
  

• 809294f1
  by Luite Stegeman at 2026-09-15T20:13:08-04:00

  rts: make stg_threadLabelzh return a valid pointer for unlabeled threads.
  
  This fixes a segfault in the GC caused by stg_threadLabelzh returning
  a 0 pointer in a GC pointer field.
  
  stg_threadLabelzh returns a tuple of type (# Int#, ByteArray# #). If a
  thread has no label, the second field is unused. We must still return
  a valid heap object pointer.
  
  Instead of returning 0, we now return stg_DEAD_SLOT_closure.
  
  fixes #27618
  

• e2d57026
  by Luite Stegeman at 2026-09-15T20:13:54-04:00

  JS: fix selector thunk handling
  
  fix a bug where entering a selector thunk could lead to a crash
  if the selected field was still a thunk.
  
  fixes #27788
  

• 1b4a622f
  by sheaf at 2026-09-17T02:39:13-04:00

  Improvements to type/data family handling
  
  This commit makes several improvements to the treatment of type and data
  families in GHC:
  
    - We consistently use "type family" instead of "type synonym family"
      to avoid a confusion with type synonyms. For example:
  
        - OpenSynFamilyTyCon ==> OpenTypeFamilyTyCon
        - ClosedSynFamilyTyCon => ClosedTypeFamilyTyCon
  
    - Various functions that were specific to data families have been
      renamed to make this clear. For example:
  
        - tyConFamInst_maybe ==> tyConDataFamInst_maybe
        - isFamInstTyCon ==> isDataFamInstTyCon
  
    - 'FamTyConFlav' has been refactored so that all closed type families
      share a single 'ClosedTypeFamilyTyCon' constructor.
      The corresponding 'IfaceFamTyConFlav' type was updated similarly.
  
      This is then used to tidy up the implementation of
      GHC.Core.FamInstEnv.reduceTyFamApp_maybe.
  

• c5aa9098
  by sheaf at 2026-09-17T02:39:13-04:00

  Small refactor of lookupFamInstEnv
  
  This commit reworks the code for looking up family instances in
  GHC.Core.FamInstEnv, reducing duplication a little bit.
  
  No change in behaviour.
  

• a3ad4588
  by sheaf at 2026-09-17T02:39:14-04:00

  Use a type family for boxing unboxed types
  
  This commit overhauls the way in which unboxed types are boxed, as per
  the updated Note [Boxing constructors] in GHC.Builtin.WiredIn.Types.Box.
  
  The main change is to allow boxing to be parametrised by representation,
  e.g. making 'Box ty' a valid type. We achieve this by implementing 'Box'
  using a closed type family:
  
    newtype Box (a :: TYPE r) = Box (BoxTF r)
  
    type BoxTF :: RuntimeRep -> Type
    type family BoxTF r where
      BoxTF IntRep    = BoxInt
      BoxTF Int8Rep   = BoxInt8
      BoxTF WordRep   = BoxWord
      BoxTF LiftedRep = Any @Type
      BoxTF (TupleRep [r1, r2]) = (BoxTF r1, BoxTF r2)
      ...
      BoxTF (SumRep rs) = BoxSum rs
  
  This new design solves the following problems:
  
    - It allows boxing a type whose 'RuntimeRep' has not yet been
      determined (e.g. because we only learn the 'RuntimeRep' after
      constraint solving). That is, 'Box @r a' is a perfectly valid type
      even if 'r' is an unfilled metavariable. This is a requirement
      to fix #25065 (in which we need to box a type whose 'RuntimeRep'
      is only filled in during constraint solving).
  
    - It handles boxing of unboxed tuples and unboxed sums, via recursive
      boxing. See Note [Boxing TupleRep and SumRep] in
      GHC.Builtin.WiredIn.Types.Box.
  
  'Box', 'BoxTF' and all of the boxing data constructors are defined in
  a new 'ghc-internal' module, 'GHC.Internal.Box'. This module contains
  nothing but wired-in declarations, and GHC never loads its interface on
  account of a wired-in thing (GHC.Builtin.Modules.isWiredInOnlyModule);
  see Note [Loading instances for wired-in things] in GHC.Iface.Load.
  
  The individual boxing data constructors are deliberately left as an
  internal implementation detail, and not exported. The intended API is
  via the two new magic 'Id's:
  
    box :: forall {r} (a :: TYPE r). a -> Box a
    unbox :: forall {r} (a :: TYPE r). Box a -> a
  
  exported from 'GHC.PrimOps' (in 'ghc-experimental'). The old boxing
  data types (IntBox, WordBox, FloatBox, DoubleBox, DictBox) are no longer
  exported from base (CLC proposal #421).
  
  We use this new design to consistently desugar:
  
    - parallel comprehensions (GHC.HsToCore.ListComp.{deListComp,dsMcStmt})
    - then/group/using statements (GHC.HsToCore.ListComp.{dsTransStmt,dsMcStmt})
    - recursive do blocks (mdo/rec) (GHC.HsToCore.Expr.dsDo)
    - arrows (GHC.HsToCore.Arrows)
  
  by consistently using 'box'/'unbox' to deal with unboxed types being put
  into big tuples. We also adapt 'GHC.Tc.Gen.Match.{tcMcStmt,tcDoStmt}'
  to create fresh /representation-polymorphic/ type variables for the
  binders that we are going to put into a big tuple (previously, GHC only
  allowed lifted types in that position).
  
  These desugaring of box and unbox is explained in
  Note [Desugaring box & unbox] in GHC.Core.Make.Box. Roughly speaking,
  the desugaring looks like:
  
    box   @r @ty e  ==>  K e
    unbox @r @ty e  ==>  case e of K x -> x
  
  where 'K' is the boxing data constructor at RuntimeRep 'r'. It's
  slightly more complicated than that in practice: we first need to
  insert a cast (see Note [The canonical type of a RuntimeRep]) using the
  new 'CanonicalProv' 'UnivCoProvenance', and unboxed tuples/sums need
  recursive logic explained in Note [box/unbox for unboxed tuples and sums],
  including a specific 'BoxSum' datatypes for unboxed sum (which also
  needed a wired-in type-level list indexing type family (!!)).
  
  The desugaring happens in two ways:
  
    - Occurrences of 'box'/'unbox' emitted by the typechecker are
      eliminated in the 'ds_app_var' case of GHC.HsToCore.Expr.
  
    - Other code that needs to box/unbox emits the appropriate code inline.
      This includes the big tuple machinery of GHC.Core.Make used by the
      desugarer (GHC.HsToCore.{Utils,Binds,Arrows,ListComp}) as well as
      the float-out pass (GHC.Core.Opt.SetLevels).
  
  Core Lint checks that no occurrence of 'box'/'unbox' survives desugaring.
  
  On the way, we overhaul the litany of big tuple functions by introducing
  
    data BigTupleLayout = BoxedElements | BareElements
  
  to distinguish the two kinds of "big tuples" that GHC routinely deals
  with; for example 'mkBigCoreVarTupSolo' becomes 'mkBigCoreVarTup BareElements'.
  All of this code is moved to the new module GHC.Core.Make.BigTuple.
  
  Fixes #20864 #22336 #22473 #25065 #27331
  
  -------------------------
  Metric Decrease:
      T9872a
  -------------------------
  

• 4cf7628a
  by Evgeny Malyshev at 2026-09-17T02:39:56-04:00

  Fix the CompactionFailed documentation link to compact
  
  The old Haddock reference links into base instead of ghc-compact.
  Use an explicit URL because ghc-compact depends on base, not vice versa.
  
  Fixes #27558
  
  Assisted-By: OpenAI Codex
  

• 098bba70
  by Facundo Domínguez at 2026-09-17T14:57:41-04:00

  Remove the call to hoistFlag from processCmdLineP
  
  This call was undesirable because it was causing a reconstruction
  of the list of flag processors.
  
  Even relying on list fusion would not be sufficient because we want
  to replace the list with a data structure with faster lookups to
  address #25763.
  
  The removal is done in two moves:
  
  * We move CmdLineP to CmdLine.hs
  * Then we move the effect of hoisting to processArgs via a new function
    hoistEwM
  

• e01799c7
  by Facundo Domínguez at 2026-09-17T14:57:42-04:00

  Do not create duplicate flag processors for the -W flag
  
  This makes simpler implementing the command line parser with a trie map
  holding flag processors. If we were to allow duplicate flag processors
  for any flag, the trie map would need to be a multimap.
  

• 3875b257
  by Facundo Domínguez at 2026-09-17T14:57:42-04:00

  Replace the list of flag processors with a trie map in `processArgs`
  
  Previously `GHC.Driver.CmdLine.findArg` was called for each
  command-line argument, doing a linear search on the list of flag
  processors each time. This was somewhat costly as the list of flag
  processor has near 2000 elements.
  
  A lookup with a trie map is faster in general, but the speed up is
  only noticeable when calling `GHC.Driver.CmdLine.processArgs` sufficient
  times, so the amount of lookups piles up. This could happen in large
  projects with many units each having many dependencies. If only a
  module needs to be recompiled, the user still needs to wait for all of
  the flag parsing to complete.
  
  The benchmark at testsuite/tests/perf/compiler/cmdline-parser shows a
  10x speed up when using the trie.
  
  The trie map is implemented in `GHC.Data.StringTrie`.
  
  The design is explained in Note [Processing command line argument fast]
  in GHC.Driver.Session.
  
  The commit also:
  * adds two property-based tests for trie map operations,
  * adds a benchmark of the command line parser, and
  * renames the predicate `arg_ok` to `valid_flag_suffix` to decide what
    flag processor should be used when there are multiple matching
    prefixes on a flag.
  
  Fixes #25763.
  

• 5236634a
  by Andreas Klebinger at 2026-09-17T14:58:24-04:00

  Compile Word64{Map,Set} with -O2 always.
  
  This is the hottest code and even if we build GHC with -O0 otherwise -O2
  pays off for these modules.
  
  Fixes #27814.
  

• 545fd4fb
  by ARATA Mizuki at 2026-09-22T15:03:24-04:00

  Change the C types of hs_{bitrev,bswap}{16,32} to match the Haskell types
  
  bitReverse{16,32}# and byteSwap{16,32}# have the type
  Word# -> Word#, but their C correspondents took and
  returned StgWord{16,32}.
  
  The mismatch on bitReverse16# led to the problem reported
  in #27299. Although no similar issue is reported for
  bitReverse32# and byteSwap{16,32}#, it seemed wise to
  change them proactively.
  
  This commit fixes the mismatch by changing the C type.
  
  Fixes #27299
  

• bf17f289
  by fendor at 2026-09-22T15:04:05-04:00

  Don't lose instances from shadowed imported modules with the same name
  
  When we look for instances below the current module, we need to check
  the unit id as well when we check for whether the module is the current
  module, otherwise we ignore modules we import that have the same name as
  the import module.
  
  Adds regression test.
  

• 53eead15
  by Wolfgang Jeltsch at 2026-09-24T20:12:03-04:00

  Correct the documentation of `explicitUnits`
  
  Resolves #27787.
  

• 35bf6f4b
  by Simon Jakobi at 2026-09-24T20:12:49-04:00

  Remove stale specHeader bullet from Note [Don't make fillers for constraint types]
  
  The Note said that Specialise.specHeader also calls mkAbsentFiller.
  abfc224a27c removed that call: the specialiser no longer drops dead
  arguments at all, see Note [Do not drop dead args from specialisations]
  in GHC.Core.Opt.Specialise.
  
  Assisted-by: Claude Fable 5.1
  

• 1abef1ef
  by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00

  Improve the `mhu-closure` makefile
  

• a79a68ea
  by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00

  Make `ghci-multi` hide all unneeded packages
  

• d6e72450
  by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00

  Improve the definition of the home unit closure property
  

• c9a2766d
  by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00

  Re-implement the home unit closure check
  
  Compared to the previous implementation, the new one has the following
  advantages:
  
    * It is correct.
        - It distinguishes between units that have the same unit ID but
          different ABI hashes.
        - When `-hide-all-packages` is not used, it considers as home unit
          dependencies also units that are made implicitly available
          because they are in the package database.
    * It seems to be faster in usual settings.
        - In particular, it does not have a preparation phase in which it
          merges the dependency information from all home units, so that
          its running time does not grow linearly with the size of the
          package database in normal Cabal scenarios.
    * It is (hopefully) clearer.
    * It is better documented.
  

• fa96acf8
  by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00

  Remove erroneous GHC flag in `hadrian-multi`
  
  The flag was `-Werror=-Wno-error=incomplete-record-selectors`. Its
  purpose was to permit incomplete record selectors, but because of the
  illegal combination of `-Werror=` and `-Wno-error` it was ignored,
  without any negative consequences.
  

• 9f48a5b9
  by Alan Zimmerman at 2026-09-25T17:02:50-04:00

  EPA: Add specific layout field to AnnList
  
  Up to now AnnList has effectively served to represent lists of things
  having layout, regardless of whether they do or not.
  
  In Haskell, layout is optional in many places, as there is also an
  alternative syntax using braces and semi-colons, which is free-form.
  
  This commit introduces AnnListLayout, a data structure capturing this
  distinction.
  
  It is deliberately set up similarly to EpLayout, so that these two can
  be merged in time.
  
  The transition is done mechanically, where AnnListBraces is not used
  yet, the original Nothing case maps to AnnListNoLayout, and the Just
  case to AnnListLayout.
  
  Later commits will fine tune these against the actual parser layout.
  

• 234bab08
  by Vladislav Zavialov at 2026-09-29T17:22:54-04:00

  Add regression test for #7803
  
  Commit 2effe18ab5, first shipped with GHC 8.2.1, fixed #7803 "Superclass
  methods are left unspecialized".
  
  This change turns the example from the ticket description into a regression
  test, checking that foo1 is fully specialised at Double, with no calls to the
  overloaded exp5Tail.
  
  Closes #7803
  
  Assisted-by: Claude Opus 5
  

• c406135c
  by Andreas Klebinger at 2026-10-01T06:57:28-04:00

  RTS: Update flag parsing/handling:
  
  Using 0 as argument to any of these flags now resets the flags setting to default:
  
      - ``-n0`` disables nursery chunking.
      - ``-K0`` (or a bare ``-K``) removes the stack size limit.
      - ``-M0`` removes the heap size limit.
      - ``-H0`` resets the suggested heap size, including the nursery scaling set by ``-H``.
      - ``-AL0`` makes the large object allocation limit follow ``-A`` again.
  
  GC Generations are now limited to 64.
  
  -n larger than -A now emits a warning and disables chunking.
  
  Fixes #27830 #27829
  

• 984ee82b
  by Andreas Klebinger at 2026-10-01T06:58:10-04:00

  Fix MultiLayerModules timeout multiplier.
  
  We accidentally used the compile multiplier for ghci commands which
  use the run timeout setting to set the timeout.
  
  Fixes #26263 and #27796.
  

• 50a9cf26
  by Andreas Klebinger at 2026-10-01T06:58:10-04:00

  testsuite: Include runtime in JUnit report.
  

• e358619f
  by Alan Zimmerman at 2026-10-01T06:59:01-04:00

  EPA: Use EpaLocation in EpVirtualBraces
  
  Haddock processing uses EpLayout.EpVirtualBraces to record the current
  layout column, for allocating haddock comments correctly.
  
  For exact printing, we need the line as well as the col, so we know
  how many lines to skip when the indented code block starts.
  
  This commit updates EpLayout.EpVirtualBraces so that it carries an
  EpaLocation instead of just the Int column, to allow it to be used for
  both purposes.
  
  It is a simple mechanical change, with no other impact, but it allows
  us to use EpLayout instead of AnnListLayout in AnnList, in the next
  commit in this series.
  

• 1d2a26ee
  by Andrew Lelechenko at 2026-10-01T20:22:04-04:00

  Remove bitSize from MINIMAL pragma of class Bits
  
  Cf. https://github.com/haskell/core-libraries-committee/issues/441
  
  The function is deprecated for 12 years and has a default implementation,
  yet it was never removed from the MINIMAL pragma, putting library authors
  in a very awkward position. Let's finally remove bitSize from MINIMAL.
  

• 3cc21e4c
  by Hannes Siebenhandl at 2026-10-01T20:22:59-04:00

  Add regression test for #27641
  

• c35096f5
  by Hannes Siebenhandl at 2026-10-01T20:23:00-04:00

  Don't `:add` modules the loader will reject
  
  Only home modules can be actually added to the loader context, thus we
  only accept the module if it belongs to a home unit.
  

• a563cb27
  by Simon Jakobi at 2026-10-02T17:37:36-04:00

  ci: accept modified changelog.d entries in lint-changelog
  
  The changelog guide says to extend an existing entry rather than add a
  new one when the feature is already documented. lint_changelog only
  counted added files, so such MRs failed before the validator ran.
  
  Fixes #27779.
  
  Assisted-by: Claude Fable 5.1
  

• 03082cd4
  by Simon Jakobi at 2026-10-02T17:38:17-04:00

  changelog.d: Fix warning flag name in the semaphore-v2 entry
  
  The entry refers to -Wsemaphore-version-mismatch, which does not exist.
  The warning GHC emits when it cannot use a -jsem semaphore, including
  on a protocol version mismatch, is -Wsemaphore-open-failure.
  
  Context: !15729, #25087
  
  Assisted-by: Claude Fable 5.1
  

• a93705ee
  by Simon Jakobi at 2026-10-02T17:38:17-04:00

  changelog.d: Fix the CLC proposal link in the T27455 entry
  
  The entry used the Sphinx :ref: role with a URL as its target. :ref:
  resolves only internal labels, so the generated release notes would
  show the proposal name without a link. Use the plain hyperlink form
  like the other entries.
  
  Context: !16274, #27455
  
  Assisted-by: Claude Fable 5.1
  

• 54381079
  by Hannes Siebenhandl at 2026-10-02T17:39:01-04:00

  Extend the `TrustOverlay` for wired-in units
  
  The TrustOverlay only contained the `UnitId` of all on-disk units.
  However, wired-in units are referred to by their wired-in unit id, which
  is not the same as the on-disk unit id.
  
  Thus, trust checks for wired-in units failed because the lookup was
  using the wired-in unit, which wasn't present in the `TrustOverlay`.
  
  We fix #27834, by copying the trust info for wired-in unit ids.
  

• f8cfb1a5
  by Hécate Kleidukos at 2026-10-04T19:36:39+02:00

  [CLC 341] Strict variants of mutable types
  
  This commit is the implementation of CLC Proposal 341
  https://github.com/haskell/core-libraries-committee/issues/341
  

• 575c4bc6
  by Rodrigo Mesquita at 2026-10-05T12:32:02-04:00

  ttg: HsModuleName in the AST, ModuleName in GHC
  
  This commit makes the AST fully independent from GHC by parsing a
  "module name" as an `HsModuleName (= HText)` rather than constructing an
  `ModuleName (= FastString)` straight away.
  
  In the GHC side, everything remains as a `ModuleName`. We turn AST
  `HsModuleName`s into fast strings with the cheap `mkFastStringShortText`
  when we process the AST for manipulation within the compiler.
  
  There are no performance regressions introduced by this approach.
  
  This is the final piece of #21592
  
  Alternative plans were discussed in
  gitlab.haskell.org/ghc/ghc/-/merge_requests/16546#note_694647,
  but the Simon suggested one won in simplicity and performance when
  compared against my attempt at implementing my original plan of having
  a family `ModuleNameP`.
  

• b3b89d32
  by mangoiv at 2026-10-05T22:03:32-04:00

  hadrian: Persist the used flavour name in the build root (#20650)
  
  This executes the idea proposed in #20650, teaching Hadrian to persist
  the flavour used to build a build root. This both makes use of multiple
  build roots more ergonomic (as the user no longer needs to repeat
  themselves) and avoids a tiresome foot-gun (forgetting to specify a
  flavour, often wholly invalidating a build root).
  
  Closes #20650.
  
  Co-authored-by: Sylvain Henry <sylvain@haskus.fr>
  

• f977837b
  by mangoiv at 2026-10-05T22:04:21-04:00

  configure: fix sed script and subst tooldir script
  
  Fixes #27672
  
  Adds sanity checking for SUBST_TOOLDIR
  
  Metric Decrease:
      LinkableUsage01
      MultiLayerModulesTH_OneShot
      T10547
      T12234
      T12425
      T13035
      T13820
      T18140
      T18730
      T18923
      T9198
      TcPlugin_RewritePerf
      mhu-perf
  

• f1cb08be
  by Hannes Siebenhandl at 2026-10-05T22:05:03-04:00

  Prepend in-memory unit database for backpack
  
  The packageDbFlags are stored in reverse order. Thus, prepending will
  ensure that the in-memory unit database is the last item on the unit
  database stack.
  
  Further, the in-memory unit database needs to be able to shadow units
  from earlier unit databases in the unit database stack.
  
  Moreover, a `-clear-package-db` would remove the in-memory database if
  it weren't the last item on the stack.
  
  Closes #27835
  

• 8d49ed42
  by Kazu Yamamoto at 2026-10-06T19:37:25-04:00

  Do not leave standard file descriptors free at startup (#24450)
  
  A process may be started with stdout closed -- `prog >&-` from a shell does
  exactly that.  Nothing then reserves descriptor 1, and open(), pipe() and
  socket() hand out the lowest free descriptor, so the next descriptor the
  runtime creates for itself takes it: the ticker's pipe, or a capability's IO
  manager control pipe.
  
  'GHC.Internal.IO.StdHandles.stdout' is a CAF, built the first time the program
  writes to stdout, which is long after that has happened.  It builds a 'Handle'
  over descriptor 1, which now belongs to the runtime, and nothing reports an
  error because the descriptor is perfectly good.  The program then writes its
  output into the runtime's own plumbing.
  
  What that looks like from the outside is a hang.  The descriptor the Handle has
  taken over is the read end of a pipe, so poll() for POLLOUT on it never says
  yes and epoll_ctl() accepts a registration for it; the thread waiting to write
  blocks for ever.  Closing the Handle at exit closes the runtime's descriptor,
  which is worse: the ticker then fails on every tick.
  
  'hs_init_ghc' now opens /dev/null onto whichever of descriptors 0, 1 and 2 are
  closed, before the runtime creates any descriptor of its own.  Each is opened
  for the access that descriptor would normally have, read-only for 0 and
  write-only for 1 and 2, so that writing to 'stdin' or reading from 'stdout'
  still fails rather than quietly succeeding against /dev/null.  See
  Note [Standard file descriptors must be open].
  
  Moving only the descriptors the runtime opens would not do: the first file the
  program itself opened would land on the free number instead.  The fix has to
  leave no free number.  A program run this way therefore finds stdout connected
  to /dev/null rather than failing with EBADF on the first write, which is what
  such a program would get from most other language runtimes.
  
  Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
  

• 65bcf9e9
  by Simon Jakobi at 2026-10-06T19:38:09-04:00

  changelog: Repair the sentence describing #27477
  
  The description read "programs using could crash", the object of
  "using" having been lost. The synopsis already says which programs are
  affected, so drop the dangling word.
  
  Assisted-by: Claude Fable 5.1
  

• 15ece296
  by mangoiv at 2026-10-08T15:14:56-04:00

  ci: move hadrian/ghci into the lint category so it can be picked up by more runners
  
  Fixes #27817
  

• c0823135
  by mangoiv at 2026-10-08T15:14:56-04:00

  ci: make lint-adjacent jobs into platform independent
  
  - move lint jobs into lint-anyarch tag
  - unify lint jobs under the same platform independent container
  

• f76464cf
  by Zubin Duggal at 2026-10-08T15:15:39-04:00

  DmdAnal: Make AbsDmd neutral in maxDmd
  
  fixes #27845
  

• ffa56ae4
  by sheaf at 2026-10-09T17:15:59+02:00

  Preserve sign of zero when parsing -0.0#
  
  This commit leverages the recently added GHC.Types.Literal.Floating
  module in order to preserve the sign of negative zero from
  source-written floating-point literals.
  
  Fixes #27545
  

• d538cac9
  by Facundo Domínguez at 2026-10-09T20:26:38-04:00

  Propagate annotations to simple interfaces
  
  This allows annotations to be visible to plugins when run by
  haddock. The LiquidHaskell plugin needs the annotations, in particular.
  
  Fixes #26761
  

• 32c4f4ab
  by meooow25 at 2026-10-09T20:27:28-04:00

  Bump containers submodule to 0.8.1
  
  And fix affected tests.
  
  * T4086a: containers depends on template-haskell-lift now instead of
    template-haskell.
  * T22611: Updated to be less dependent on containers internals.
  

• c786065e
  by sheaf at 2026-10-09T20:28:20-04:00

  Use an explicit pattern match in toIfaceIdDetails
  
  The old wildcard pattern let this code bit rot: it did not properly account
  for recently added 'IdDetails' such as 'RepPolyId', which resulted in
  spurious 'pprTrace' messages that could even pollute HLS sessions.
  
  Fixes #23785
  

• e7cacf59
  by sheaf at 2026-10-09T20:29:09-04:00

  Take into account ifKind in freeNamesIfDecl
  
  Commit 3c2f4bb4 added the 'ifKind' field to various constructors
  of 'IfaceDecl', which preserves the original kind (before type synonym
  expansion) for better error messages.
  
  However, that commit forgot to update 'freeNamesIfDecl' correspondingly.
  This could result in a "urk! lookup local fingerpring" crash when e.g.
  a type's kind uses a type synonym defined later, as we failed to add a
  dependency on the type synonym during dependency analysis.
  
  Fixes #27916
  

• 41e80f41
  by Simon Peyton Jones at 2026-10-11T14:38:51-04:00

  Simplify the error-suppression mechanism in GHC.Tc.Errors
  
  In `GHC.Tc.Errors.reportWanteds` we suppress some errors in favour of
  others.  But the mechanism had grown crufty, and #27331 exposed a bug.
  
  This MR makes it simpler and more uniform, by doing everything via
  the `ei_suppress` field of the ErrorItem.
  
  Claude then found another closely-related bug (see the review linked
  on !16564).  That bug is immortalised in new test T18851d.
  
  I'm still not happy with `ignoreConstraint` but we can worry about
  that another day; I have not touched it.
  
  Main changes
  
  * Instead of /predicting/ when an error will be reported, we set
    `cec_error_reported` when an error is /actually/ reported.  (I renamed
    it from `cec_suppress` to reflect this change.)
  
    Now errors are suppressed only when a preceding error has actually been
    reported.  Simpler and more robust.
  
    See `Note [cec_error_reported: suppressing less-serious errors]`
  
    The big changes are in `reportWanteds` which looks very different.
  
  * New `Note [ei_suppress: suppressing confusing errors]` describes the
    (quite separate) `ei_suppress` mechanism for suppressing confusing
    errors, mainly arising from non-empty rewriter sets
  
  * In `tryTypeClassDefaulting`, instead of switching off type-class defaulting
    if there is an insoluble /anywhere/, we just switch it off locally when
    we find an insoluble sub-tree. See Note [When to do type-class defaulting]
    and (W5) in Note [ApproximateWC]
  
  * Greatly simplify `insolubleWantedCt`.
  
  * I made type-class-defaulting be a bit more eager, only switched off when
    a peer or ancestor (but not child) constraint is insoluble.  See
    Note [When to do type-class defaulting].
  
  Small refactorings
  
  * Rename `askNoErrs` to `askErrsFound` and flip its polarity
  
  * The code for "check if ei_suppress is true of all items" code is
    moved to `mkErrorItems` rather than in the large `reportWanteds`.
  
  * Code for `has_gadt_match` moves to `mkGivenErrorReporter`, rather than
    polluting the large `reportWanteds`.
  
  * Many tests with `-fdefer-type-errors` get more warnings, especially
    about ambiguous (Num a) constraints. This is by-design: see
    Note [Always warn with -fdefer-type-errors].  Previously GHC was not
    honouring this Note but now it is, hence the extra errors.
  

• f217fc31
  by Cheng Shao at 2026-10-11T14:39:33-04:00

  compiler: ensure cross ghc --info output target unit ids
  
  Previously, for cross ghcs, the base/ghc/ghc-internal unit ids in
  --info output do not match the target unit ids reported by ghc-pkg,
  breaking cross ghc release builds with hash-unit-ids when being used
  with cabal 3.18. This patch fixes it by making --info output target
  unit ids. Fixes #27919.
  
  Co-authored-by: Codex <codex@openai.com>
  

• d07a5176
  by Simon Peyton Jones at 2026-10-13T18:10:39-04:00

  Remove the Eq and Ord instances for ForAllTyFlag
  
  In Note [Comparing visibility] in GHC.Core.TyCo.Compare we read that
  "we always compare ForAllTyFlags with `eqForAllVis` or `cmpForAllVis`"
  But alas there was an Eq and Ord instance for ForAllTyFlag, which made it
  impossible to check this claim.   So I made these changes:
  
  * Move the definition of ForAllTyFlag and its related functions from
    L.H.S.Specificity (where it did not belong, since L.H.S didn't use it)
    into GHC.Types.Var.
  
  * Remove the Eq and Ord instances for ForAllTyFlag
  
  * Deal with the fallout, by using `eqForAllVis` or related functions.
  
  * In interface files we use IfaceType as a key for a de-deduplication map
    See Note [Deduplication during iface binary serialisation]
    in GHC.Iface.Binary.  For this we need /exact/ comparison, so we use a
    newtype wrapper for IfaceForAllTyFlag, and give use `cmpForAllTyFlagExactly`
    to implement its Ord instance.  Tiresome but easy.
  
  * Rename `toIfaceForAllBndrs` to `toIfaceForAllTyBndrs`
  

• ea5c054d
  by Simon Peyton Jones at 2026-10-13T18:10:39-04:00

  Refactor type and coercion substitution
  
  This MR refactors type and coercion substitution so that they use
  TyCoMapper, rather than hand-rolled code.  Fundamentally it's a simple
  idea, but I had to do quite a bit of refactoring to make it fly.
  
  I got Claude to help me this this refactoring, but I paid careful
  attention to every line of code.
  
  Main changes:
  
  * New module GHC.Core.TyCo.Make which defines TyCoMapper, and a bunch of other
    simple "smart constructors" for types and coercions.  See
    GHC.Core.TyCo.Rep Note [The Type-related module hierarchy], esp (TRM1)
  
  * The new TyCoMapper has new fields `tcm_tcapp_ty` and `tcm_tcapp_co` to handle
    type-constructor applications.  These replace `tcm_tycon`.
  
  * Rewrite GHC.Core.TyCo.Subst to use TyCoMapper
  
  * Rewrite GHC.Core.Type.expandTypeSynonyms to use TyCoMapper.
  
  * Implement `seqType` and `seqCo` with TyCoFolder. To to this I had to add
    a `tcf_lit` field to TyCoFolder.
  
  * A new module GHC.Utils.StrictIdentity to define a strict identity monad,
    which itself is used for
        substTyCoMapper :: TyCoMapper Subst StrictIdentity
  
  * I removed an apparently-unused instance for Binary Levity
  
  Refactoring `seq` functions
  
  * In GHC.Core.Seq, redefine `seqOneShot`, `seqRuleInfo`, and friends to return
    `SeqResult`, a new type defined in GHC.Types.Baseic, rather than `()`.  We
    can define a Monoid instance for `SeqResult` that does the right thing.
  
  * This has knock-on effects across the compiler.
  

• 34165e23
  by Simon Peyton Jones at 2026-10-13T18:10:39-04:00

  Refactor TyCoMapper to take a single monad; add StrictReaderT
  
  TyCoMapper used to be parameterised over both an environment and a
  monad, with fields like
      tcm_tyvar :: env -> TyVar -> m Type
  Now it is parameterised over just the monad:
      tcm_tyvar :: TyVar -> m Type
  If the mapping needs an environment, `m` is a reader monad over that
  environment.  Many uses (e.g. zonkTcTypeMapper, swizzleMapper) need no
  environment at all, and used to pass a dummy ().  The binder field
  becomes
      tcm_tycobinder :: forall r. TyCoVar -> ForAllTyFlag
                     -> (TyCoVar -> m r) -> m r
  and runs the continuation in the extended environment.  mapTyCoX is gone;
  only mapTyCo remains.
  
  To make this efficient, the reader monad must use the one-shot trick and
  be strict in the environment.  So:
  
  * New module GHC.Utils.Monad.StrictReader defines
        newtype StrictReaderT r m a
    with hand-written instances.  The builder of the pattern synonym
    `StrictReaderT` is a smart constructor that adds both `oneShot` and a
    bang on the environment, so every StrictReaderT computation is strict
    in the environment.  See Note [Instances for StrictReaderT].
  
  * ZonkT becomes  type ZonkT = StrictReaderT ZonkEnv
    ZonkM becomes  type ZonkM = StrictReaderT ZonkGblEnv IO
    replacing their own hand-written instances.
  
  * Substitution uses
        type SubstM = StrictReaderT Subst StrictIdentity
        substTyCoMapper :: TyCoMapper SubstM
    and similarly expandTypeSynonymMapper.
  
  * zonk_tycomapper :: TyCoMapper (ZonkT TcM) is now much simpler.
  
  * swizzleMapper uses StrictIdentity rather than Identity.
  
  * Module renaming, so that the strict monads are all peers in GHC.Utils.Monad:
        GHC.Utils.StrictIdentity      ==>  GHC.Utils.Monad.StrictIdentity
        GHC.Utils.Monad.State.Strict  ==>  GHC.Utils.Monad.StrictState
    alongside the new GHC.Utils.Monad.StrictReader.
  
  Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
  

• c0299e15
  by Simon Jakobi at 2026-10-13T18:11:23-04:00

  testsuite: Line-buffer the driver's stdout
  
  Python block-buffers stdout when it is a pipe. This is the case for
  example in CI. As a result there is often no indication of progress at
  all until the run ends.
  
  To fix this, we configure it explicitly to use line buffering instead.
  
  stderr is reconfigured too, for consistency: Python line-buffers it by
  default since 3.9.
  
  The type-ignores are for mypy, which types these handles as TextIO — an
  interface without reconfigure.
  
  Fixes #12934.
  
  Assisted-by: Claude Fable 5
  

• 9b5beaa2
  by Florian Ragwitz at 2026-10-13T18:12:05-04:00

  hpc: Improve coverage semantics for instance methods and instances
  
  Users care about which of their explicitly written methods are or aren't
  covered, not whether all of the inherited methods are covered as well. Those
  should be covered where they are implemented.
  
  We therefore skip generating top-level boxes for inherited methods which will
  appear as uncovered with no clear indication as to why, and no way to fix other
  than exercising code the user has not written.
  
  Previously, top-level boxes for those inherited methods would use the instance
  head as their source span. Now that those boxes are gone, we can use that
  source span for another purpose:
  
  We introduce a new top-level box for each class instance with its instance head
  as the source span, and use that to indicate whether or not an instance has
  been covered at all.
  
  We do this by making any method of the instance, inherited/generated or
  otherwise, tick the box for the instance head. Excluded from this are
  methodless classes, which could never be covered using the current mechanism.
  This could be improved upon further.
  
  These changes apply to ticking for program coverage only, and don't affect
  source notes. Additionally, we update the scope of record selector ticking to
  be limited to program coverage as well, as the oversight to also extend it to
  source notes has previously caused bugs and because record selector ticking is
  coverage-specific.
  
  Fixes #17155, #15932.
  

• 836ec50a
  by Simon Peyton Jones at 2026-10-13T18:12:54-04:00

  Refactor fundeps again
  
  This MR fixes #27828; there was a bad scoping error in `trim_qtvs`.
  
  The main changes are
  
  * Refactor `trim_qtvs` completely to eliminate the bug.
  
  * Remove a redundant `apartnessCheck` from `mkTopOpenFamEqFDs`.
  
  * Lots of improvements to the Notes in FunDeps.hs
  
  I also did a couple of pure refactors:
  
  * I realised that we were carefully caching `cab_incomps` in each
    `CoAxBranch`, to make it more efficient to reduce a type family application,
    but we were not doing the same thing when computing relevance for functional
    dependencies; see Note [Relevance] in GHC.Tc.Solver.FunDeps.  So I added
    `cab_overlaps`, which is now used in `noEarlierMatch`.
  
  * Use a proper data types, `AmIUnifying` and `OuterKindsFlag`, for two
    previously-Boolean arguments to `tc_unify_tys`.  This is a pure refactor.
  

• 889ef371
  by Simon Peyton Jones at 2026-10-13T18:13:36-04:00

  Refactor and simplify solver's unification code
  
  Ticket #27844 showed that GHC's constraint solver could miss an
  occurs check, and thereby build an infinite type.
  
  This patch significantly simplifes the code in
     GHC.Tc.Solver.Equality.canEqCanLHSFinish_try_unification
     GHC.Tc.Solver.Equality.canEqCanLHSFinish_no_unification
  
  It is now significantly simpler, and requires much less subtle
  reasoning to understand.
  
  Main changes
  
  * If `canEqCanLHSFinish_try_unification` fails to unify, it now /always/ calls
    `canEqCanLHSFinish_no_unification` rather than trying to finish the job itself.
  
  *  `GHC.Tc.Solver.Monad.checkTypeEq` is moved from Monad into Equality, and renamed
     to `GHC.Tc.Solver.Equality.checkTypeEqNoUnification`.
  
  * `canEqCanLHSFinish_no_unification` calls `checkTypeEqNoUnification` to test
    the invariants for an inert equality.  Before this MR there was a special case for
    `do_not_prevent_rewriting`, but that has gone; instead it's just a consequence of
    the flags passed to `checkTyEqRhs`, documented in the `PuOK` case of
    `canEqCanLHSFinish_no_unification`.
  
  * There is only one bit of "swap back" code, in `finish_no_unify` in
    `canEqCanLHSFinish_try_unification.  Previously this code was duplicated.
  
  * `kickOutAfterFillingCoercionHole` should account for equalities with a
    TyFamLHS.  See (KOC5) in Note [Kick out after filling a coercion hole]
  
  * No need to gather coercion holes in the `PuOK` case of `canEqCanLHSFinish_no_unification`.
    See documentation with that code.
  

• f9193e53
  by Simon Peyton Jones at 2026-10-13T18:13:37-04:00

  One line fix to fallout from
  
  ...#27731, !16564, simplifying Tc.Errors machinery
  
  There was an over-eager assert!
  

• cdd56b7a
  by Florian Ragwitz at 2026-10-13T18:14:19-04:00

  Fix several sphinx errors and warnings from rendering the release notes
  
  The extension references which are removed here are for extension which were
  already previously undocumented, so just removing them seems fine for now.
  

• 4f00da25
  by Florian Ragwitz at 2026-10-13T18:14:19-04:00

  Link to QualifiedStrings documentation
  

• 97adaf89
  by Simon Peyton Jones at 2026-10-14T00:07:27+01:00

  Line up simpleUnifyCheck and check_ty_eq_rhs
  
  Even after #26543 was allegedly fixed, the original repo case in the
  Description continued to fail.  The reason was that the QuickLook
  unifier, `qlUnify`, used `simpleUnifyCheck` for checking unification
  invariants; and `simpleUnifyCheck` conservatively rejected any RHS
  with a coercion hole in it.  The upshot was that QuickLook was not
  as clever as it should be, wrongly failing to do an impredicative
  instantiation.
  
  Interestingly `check_ty_eq_rhs`, which does the same job during
  constraint solving, was more liberal: it just looked at the free vars
  of the coercion, and allowed coercion holes.
  
  This MR lines them up, adding some careful notes.  See
      Note [simpleUnifyCheck]
      Note [Occurs check and coercions]
      Note [Unification preconditions] esp (COERCIONS)
  
  Things are better than before, but I am still uncomfortable about the
  possibilty that a hole might be filled with a coercion that mentions
  the LHS type variable; for now I have left this discomfort documented
  in Note [Occurs check and coercions].
  
  Main changes
  
  * `qlUnify` now only unifies /instantiation variables/ not regular unification
    variables.  This makes QuickLook more predictable.  See (UQL6) in
    Note [QuickLook unification].
  
  * `qlUnify` no longer needs to call `simpleUnifyCheck`, so we can get rid of
    `UC_QuickLook` and its code in `simpleUnifyCheck`.
  
  * I found I could get rid of `mkOccFolders` in favour of `anyFreeVarsOfType`.
    Hooray.
  
  * Improve documentation of CycleBreakerTv, and rename it to GivenCycleBreakerTv
    because they are only uesd for Givens!
  
  * I accepted a 9% worsening in compile time allocation on T5030
    because the newly-consistent story triggered #27934.
  
  Other changes
  
  * I refactored `atvFolder` so that it pairs the "interesting-var" function
    with the in-scope set, to avoid building a closure with a free variable.
    Now we get nice tight loops for `anyFreeVarsOfType` and friends.
    See Note [Any-free-var folder].
  
  Metric Increase:
      T5030
  

• 5f7b3047
  by Simon Peyton Jones at 2026-10-14T00:07:27+01:00

  Fix order-dependence in QuickLook
  
  Ticket #27917 pointed out that QuickLook was order-dependent
  -- very bad!
  
  The solution is in `qlUnify`: spot when we are unifying a type with a
  definite monotype, and then monomorphise any free instantiation
  variables of that type.
  
  See (UQL8) and (UQL9) in Note [QuickLook unification].
  

• c391c70c
  by Simon Peyton Jones at 2026-10-14T00:07:28+01:00

  Add some comments about RuntimeUnk
  
  This commit just adds comments explaining why we don't need to worry about
  RuntimeUnkTv in the constraint solver.
  
  It also tightens up docmentation of earlier (overlapping) commits in
  this MR.
  

• 7df3ba2f
  by Andrea Vezzosi at 2026-10-14T06:15:48-04:00

  add runGhcWithSignalHandlers and remove handling from runGhc[T]
  
  it only ever makes sense to call `withSignalHandlers` from `main`, otherwise
  signals can be too easily swallowed without notification to the rest of your
  process.
  
  This commit takes withSignalHandlers out of `runGhc/runGhcT` and provides
  `runGhcWithSignalHandlers` for the old behaviour.
  

• 3a72b8a2
  by Hannes Siebenhandl at 2026-10-14T13:48:32-04:00

  Fix #27836, normalise unit database path in ExternalUnitDatabases
  
  Add a regression test, proofing that all variations:
  
  - local-unit-db/my-test.conf
  - ./local-unit-db/my-test.conf
  - ./local-unit-db/my-test.conf/
  
  are parsed only once.
  

• 8ddbc6f9
  by Florian Ragwitz at 2026-10-14T13:49:28-04:00

  Remove obsolete HPC types
  
  Fixes #27946.
  

• f34c79ee
  by Alan Zimmerman at 2026-10-15T04:54:47-04:00

  EPA: Start using vocurly as basis for AnnListLayout
  
  For the existing cases that populate AnnList.
  
  This uses AnnListBraces when braces are explicitly supplied, and
  AnnListLayout when vocurly is used
  
  The change also shows up AnnList usages that can never capture layout,
  these are cleared up later.
  

• 033ba59c
  by sheaf at 2026-10-15T04:55:44-04:00

  Make exprFreeVars deep
  
  exprFreeVars used to be a shallow free-variable finder (it didn't look
  into kinds), but most callers wanted it to be deep. In particular,
  'exprFreeVars' is often used to seed an 'InScopeSet', and that must
  contain the /deep/ free variables.
  
  This commit makes it deep, which allows us to get rid of calls to
  'closeOverKinds' or other workarounds for shallowness in:
  
    - 'GHC.Core.Opt.Simplify.Utils.abstractFloats'
    - 'GHC.HsToCore.Binds.dsSpec_help'
    - 'GHC.Core.Opt.Arity.etaBodyForJoinPoint'
    - 'GHC.Core.FVs.freeVars'
    - 'GHC.Core.Lint.lintCoreRule'
  
  We also remove 'deepExprsFreeVarsDSet' and 'closeOverKindsDSet'.
  
  Other places needed a little bit more care, in particular to properly
  handle coercion variables free in kinds:
  
    - 'GHC.Core.Opt.Specialise.specHeader' quantifies over the binder of
      an unspecialised argument directly, instead of computing the free Ids
      of the argument.
    - 'GHC.HsToCore.dsWarnRuleShadowing' filters out 'CoVar's.
    - 'GHC.Core.Opt.SpecConstr.callToPat' had some ad-hoc logic to compute
      argument pattern types and a workaround with 'expandTypeSynonyms'.
      That logic is removed in favour of a new 'argsToPats' function which
      directly computes the argument pattern types by instantiating the
      type of the head of the call pattern.
  
  Fixes #27936
  

• f93d523c
  by Luite Stegeman at 2026-10-15T04:56:34-04:00

  testsuite: Use mkWeakMVar in memo001/memo002
  
  mkWeakPtr in the memo001/memo001 tests created weak pointers
  with the MVar box as the key, which is fragile in the presence
  of optimization. The fix is using mkWeakMVar, keying on the
  primitive MVar# instead.
  
  Fixes #27924 and #27396
  

• 8c947573
  by Simon Peyton Jones at 2026-10-16T13:11:53+01:00

  Improve exprOkForSpeculation
  
  Fixes #27910, which exposed an infelicity in exprOkForSpeculation
  
  The new story is carefully described in new Note [exprOkForSpeculation],
  esp (a-c) and (EOKS1).
  

• 7dedcf13
  by Alan Zimmerman at 2026-10-16T19:03:17-04:00

  EPA: Add TTG fields to FamilyInfo
  
  This commit is a simple add, with unused extension fields.
  
  It lays the groundwork for using them for exact print annotations
  

• 26b9a8a0
  by Arkissa at 2026-10-17T16:04:10+00:00

  ghci: Prefer exact source spans in :type-at
  
  Prefer expression types for identical source spans.
  
  Fixes #27412.
  

• 70dc4e61
  by sheaf at 2026-10-18T18:15:15-04:00

  Carefully implement coercion zapping
  
  This commit implements coercion zapping in the rewriter, controlled by
  the -fzap-coercions flag (on by default). This significantly reduces
  the size of coercions produced when rewriting type family applications,
  resulting in much faster compilation. See Note [Coercion zapping]
  in GHC.Tc.Solver.Rewrite for an explanation and further details.
  
  The rewriter now keeps track of the `CoVar`s and `CoercionHole`s it uses
  when rewriting, which allows computing the dependencies of a zapped
  coercion without traversing the coercion the rewriter produced, as
  explained in Note [Computing coercion dependencies] in GHC.Tc.Solver.Rewrite.
  
  Accompanying changes:
  
    - Rework how dependencies of 'UnivCo's are tracked, purely for
      performance reasons.
  
      We now use the 'UnivCoDeps' datatype instead of '[Coercion]', and
      we now insist that 'uco_deps' also contains the CoVars that appear
      in the LHS and RHS types of the UnivCo (as a caching mechanism).
  
    - Several performance improvements to the rewriter (e.g. increased
      strictness).
  
    - Improvements to the family application cache, including:
      - Better documentation.
      - Only cache a whole chain of reduction steps.
      - Don't put coercion holes in the cache, fixing #27518.
  
    - Allow Core Lint to be called from within the typechecker (and from
      within the coercion optimiser).
  
    - Move out "annotation linting" from Core Lint into the general Core
      pipeline, to avoid the dependency GHC.Core.Coercion.Opt->GHC.Core.Lint
      causing a regression in CountDepsParser due to transitive
      dependencies of GHC.Core.Opt.Monad and GHC.Unit.Module.ModGuts.
  
  Fixes #8095 #27336 #27518
  
  Summary of performance numbers
  
    Compile-time byte allocated in GHC's testsuite (0 regressions)
  
            CoOpt_Singletons(normal) ghc/alloc    634,040,332    595,448,728  -6.1% GOOD
             FamAppCachePerf(normal) ghc/alloc    495,629,812    191,612,920 -61.3% GOOD
                 LargeRecord(normal) ghc/alloc  1,226,806,434    966,260,976 -21.2% GOOD
               SimplCastPerf(normal) ghc/alloc    160,505,678    148,112,688  -7.7% GOOD
                      T12227(normal) ghc/alloc    244,668,982    233,037,216  -4.8% GOOD
                      T12545(normal) ghc/alloc    697,804,842    424,705,152 -39.1% GOOD
                      T13386(normal) ghc/alloc    422,871,076     35,213,656 -91.7% GOOD
                      T15703(normal) ghc/alloc    288,402,364    273,692,560  -5.1% GOOD
                      T26426(normal) ghc/alloc     86,002,052     78,152,104  -9.1% GOOD
                      T27336(normal) ghc/alloc    498,932,268     35,886,016 -92.8% GOOD
                       T5030(normal) ghc/alloc    117,057,706     88,785,648 -24.2% GOOD
                    T5321Fun(normal) ghc/alloc    252,552,628    243,820,176  -3.5% GOOD
                       T8095(normal) ghc/alloc    768,198,564    127,779,520 -83.4% GOOD
                      T9872a(normal) ghc/alloc  1,655,675,020  1,406,017,008 -15.1% GOOD
                      T9872b(normal) ghc/alloc  1,864,180,628  1,644,706,696 -11.8% GOOD
                T9872b_defer(normal) ghc/alloc  2,834,585,468  1,657,729,760 -41.5% GOOD
                      T9872c(normal) ghc/alloc  1,572,573,116  1,354,055,424 -13.9% GOOD
                      T9872d(normal) ghc/alloc    351,516,004    331,071,424  -5.8% GOOD
        TcPlugin_RewritePerf(normal) ghc/alloc  2,063,065,680  1,847,464,272 -10.5% GOOD
  
    Chesskell (github.com/Proxymoron461/chesskell/issues)
      Typechecking that the first N plies of kholmovVsBronsteinShort
      are a valid chess game:
  
        Plies | GHC 9.14 time/alloc | This commit time/alloc |
        -----:|---------------------|------------------------|
        2     | 41s/20GB            | 0.2s/19MB              |
        4     | 95s/49GB            | 0.3s/25MB              |
        6     | timed out           | 0.6s/522MB             |
        8     | timed out           | 7s/673MB               |
        10    | timed out           | timed out              |
  
    Compilation of singletons-base: compile time -28%, allocations -25%
  
  -------------------------
  Metric Decrease:
      CoOpt_Singletons
      FamAppCachePerf
      LargeRecord
      SimplCastPerf
      T12227
      T12545
      T13386
      T15703
      T24984
      T26426
      T27336
      T5030
      T5321Fun
      T8095
      T9872a
      T9872b
      T9872b_defer
      T9872c
      T9872d
      TcPlugin_RewritePerf
  -------------------------
  
  Co-Authored-By: Sylvain Henry <sylvain@haskus.fr>
  

• 3d326d7d
  by Sylvain Henry at 2026-10-18T18:16:09-04:00

  JS: fix stack corruption in h$ap_gen_fast's pushAllRegs (#27624)
  
  The loop added in 9e46990976 ("JS: support more than 128 registers
  (#26558)") pushed register N to stack[sp - N - 2] while the switch it
  falls through into, and every reader of the h$ap_gen frame, uses
  stack[sp - (N - 2)]. Registers >= R32 were therefore written 4 slots
  too low: the slots the readers consult were left stale and the frame
  below was silently corrupted.
  
  Fix the loop to use the same slot formula as the switch, and add a
  regression test: an unknown call to a thunk with 35 argument register
  slots, which goes through the generic apply.
  
  Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
  

• 6bbca569
  by Andreas Klebinger at 2026-10-21T10:01:10+00:00

  Fix a few tag inference bugs.
  
  * Treat bottoming functions and nullary join points as functions.
  * When generating bytecode don't rely on imported tag sigs.
  
  Fixes #27831, #27841 and #27842.
  

• 71808e29
  by Sylvain Henry at 2026-10-22T04:50:24-04:00

  Add GHC.Internal.Unboxed.Do: do-notation for unboxed values (#27944)
  
  QualifiedDo operators can be representation-polymorphic: a do-block is
  expanded into ordinary applications before typechecking, and the only
  check on a bound variable is the deferred fixed-runtime-rep check. A
  representation-polymorphic (>>=) cannot be defined directly, though,
  because its body would bind a variable of unknown representation.
  
  The new module provides such operators for State#-passing code as
  methods of a class indexed by RuntimeRep, with one instance per
  representation. With optimisation the dictionaries disappear and a
  block compiles to the usual nested case expressions:
  
    Ubx.do { x <- readWordArray# mba 0#     -- x :: Word#
           ; writeWordArray# mba 1# x        -- unit actions are statements
           ; Ubx.pure x }
  
  Also add users guide documentation and tests.
  
  Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
  

• 33247780
  by Sylvain Henry at 2026-10-22T04:50:24-04:00

  Bignum: use Ubx.do for State#-passing code (#27944)
  
  Rewrite the State#-passing code of the GHC.Internal.Bignum modules
  (Primitives, WordArray, BigNat, Natural, Integer, Backend.Native,
  Backend.GMP) with the qualified do-notation of GHC.Internal.Unboxed.Do.
  Nested case chains such as
  
      case newWordArray# sz s of { (# s, mwa #) ->
      case act mwa s          of { s ->
      unsafeFreezeByteArray# mwa s }}
  
  become
  
      Ubx.do
         mwa <- newWordArray# sz
         act mwa
         unsafeFreezeByteArray# mwa
  
  The optimised Core is unchanged (compared per top-level binding).
  
  BigNat now enables MonoLocalBinds: local loops written with Ubx.do
  must stay monomorphic in the state type, otherwise GHC does not turn
  them into join points.
  
  Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
  

• 593f5f5b
  by Sylvain Henry at 2026-10-22T04:51:16-04:00

  JS: remove archive padding after wasm objects (#25665)
  
  On Darwin hosts, emar (llvm-ar) writes archives in the Darwin format when
  the first member is not a known object file, which is the case for the
  archives of the JS backend. This format pads each member to 8 bytes with
  '\n' and includes the padding in the member size. Wasm objects do not
  accept trailing bytes: wasm-ld failed with "section too large".
  
  The JS linker now removes this padding when it extracts a wasm object from
  an archive. In addition, Hadrian passes --format=gnu to emar for the JS
  target. See Note [Wasm objects in Darwin archives].
  
  Also document the format of Cc (wasm) objects in Note [Cc object format].
  
  Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
  

• 13dff5d0
  by L0neGamer at 2026-10-22T21:37:31-04:00

  add options for resizing bytearrays (#27244)
  
  add five mutable bytearray resizing operations
  for various kinds of pinnedness and aligning.
  
    - prefer unpinned when allocating new array (``resizeMutableByteArrayPreferUnpinned#``; the ``resizeMutableByteArray#`` default)
    - prefer pinned when allocating new array (``resizeMutableByteArrayPreferPinned#``)
    - prefer aligned and pinned when allocating new array (``resizeMutableByteArrayPreferAlignedPinned#``)
    - prefer same as input bytearray when allocating new array (``resizeMutableByteArrayKeepPinnedness#``)
    - ensure the output array is aligned and pinned after operation (``resizeMutableByteArrayMakeAlignedPinned#``)
  

• 0c17201c
  by Sylvain Henry at 2026-10-22T21:38:23-04:00

  JS: implement performMinorGC and performBlockingMajorGC (#28012)
  
  GHC.Internal.System.Mem imports three C entry points: performMajorGC,
  performGC (for performMinorGC) and performBlockingMajorGC. The JS RTS
  only defined h$performMajorGC, so calling performMinorGC or
  performBlockingMajorGC threw "ReferenceError: h$performGC is not
  defined" at runtime.
  
  The JS RTS has a single non-generational collector, so both missing
  entry points are now aliases of h$performMajorGC.
  
  Add a test that calls every GC entry point of System.Mem.
  
  Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
  

• 7a631ff2
  by L0neGamer at 2026-10-23T09:11:39-04:00

  Mon(a|oi)d of No (Return|Mappend) progress (!15795)
  
  Make non-canonical definitions of return and mappend
  non-suppressible errors, and make canonical definitions
  of those methods warnings.
  
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/328
  

• 14656fd4
  by Simon Jakobi at 2026-10-23T09:12:27-04:00

  Cmm: keep the CBE substitution idempotent
  
  When blocks are merged over multiple rounds during common block
  elimination, a block that won a merge in an earlier round can still
  lose a merge in a later round. The substitution map (Subst) used to
  record this as a chain: the earlier loser mapped to a block that was
  itself eliminated. In PLT terminology, the substitution became
  *non-idempotent*. Applying such a substitution with a single lookup
  left edges to unreachable blocks in the Cmm graph, eventually leading
  to a setInfoTableStackMap panic (#27368).
  
  With this patch, each round's fresh substitutions are applied to the old
  ones as they are added (extendSubst), so every eliminated block maps
  directly to its final replacement and the substitution stays idempotent.
  
  Fixes #27368.
  
  Assisted-by: Claude Fable 5.1
  

• 92848e61
  by Evgeny Malyshev at 2026-10-23T20:26:04-04:00

  hadrian: Include transitive dependencies in Haddock builds
  
  Haddock needs indirect dependency interfaces to resolve references to
  definitions outside a package's direct dependencies. Expose Cabal's
  configured dependency closure through ContextData and use it alongside
  the direct list, preserving direct-interface precedence.
  
  Bump Shake's cache version for the serialized oracle change. Add a
  Hadrian selftest requiring template-haskell's indirect ghc-prim interface.
  
  Fixes #25850.
  Fixes #27786.
  
  Assisted-By: OpenAI Codex
  
  Metric Increase:
      haddock.Cabal
  

• 5e8ae81b
  by Zubin Duggal at 2026-10-23T20:26:47-04:00

  WinIO: Don't confuse Win32 errors and NTSTATUS codes
  
  WinIO misinterpreted NTSTATUS codes as Win32 errors, and had some ad hoc logic to deal with this.
  However, this logic was incomplete and resulted in the mishandling of results of certain I/O operations
  (see testcase).
  
  Now the `ErrCode` argument in `CompletionCallback` is always the Win32 error code,
  and we convert the NTSTATUS using RtlNtStatusToDosError.
  
  Also when an overlapped/async operation such as ReadFile fails immediately,
  with a Win32 error such as ERROR_BROKEN_PIPE, we don't get a further completion
  notification, so we never recorded the failure. This worked by coincidence
  earlier, because `STATUS_PENDING` happened to have the same numerical code as
  `ERROR_NO_MORE_ITEMS`, but it doesn't now that we translate `STATUS_PENDING`
  into the correct Win32 error code (`ERROR_IO_PENDING`). Fix this by using
  the Win32 error value we obtained when an operation returns `STATUS_PENDING`.
  
  Fixes #27971
  

• c42ed66a
  by Martijn Bastiaan at 2026-10-24T16:00:42+02:00

  Add single-threaded test for #27526 + #27123
  
  Issue #27526 is a duplicate of #27123, which has already been fixed in
  HEAD. The proposed patch in the former carries a "nicer" regression test
  in that it doesn't rely on multi-threading to trigger.
  
  Closes #27526
  

• 7f73f515
  by Simon Peyton Jones at 2026-10-24T17:29:19-04:00

  Refactor QuickLook a bit
  
  This MR simply refactors QuickLook a bit.  In particular, it
  simplifies `tcApp`, and moves shared code into `finishApp`.
  
  It also adds `Note [QuickLook: arguments before result]`
  responding to #26599.
  
  There should be no user-visible changes, except perhaps in error messages,
  which improve marginally.
  
  For some reason T24984 compiles 8% faster. I'll take the win!
  
  Metric Decrease:
      T24984
  

• a4a3a964
  by Alan Zimmerman at 2026-10-24T17:30:03-04:00

  EPA: Use AnnList for XClosedTypeFamily
  
  We now have TTG annotations for FamilyInfo.
  
  Make use of it to store the AnnList annotations for a closed type
  family.
  

• 953e4c7f
  by sheaf at 2026-10-26T18:19:10-04:00

  Rework LogQueue to be a proper queue
  
  Now 'LogQueue' uses a 'TQueue' with a separate 'TVar' to indicate
  whether the log queue is finished logging, instead of the previous weird
  data representation using a reverse-order '[Maybe Msg]' with 'Nothing'
  denoting the end of the queue.
  

• ec29c5fa
  by Rodrigo Mesquita at 2026-10-26T18:19:10-04:00

  Refactor GHC.Driver.MakeAction
  
  Pull out of 'runParPipelines' the logic for creating a 'MakeEnv' ready
  to be used by multiple threads, as that will be useful for downsweep as
  well (which doesn't fit the 'runPipelines' flow), rather than being just
  for upsweep.
  
  The code is moved and re-structured to match the export list, simplify
  the sequentiality checks previously both in 'runPipelines' and
  'runAllPipelines', which were weirdly similar and confusing; into the
  two part step where we need these checks: (1) to construct the MakeEnv,
  (2) to run the MakeActions in parallel. These two steps are separate and
  used to be too mixed up.
  
  Some additional little simplifications or clean ups here and there.
  

• 3fb22073
  by Rodrigo Mesquita at 2026-10-26T18:19:11-04:00

  Refactor GHC.Driver.Downsweep in preparation for parallel downsweep
  
  Pure refactor to improve the code to facilitate implementing parallel
  downsweep in the next commit.
  
  This commit puts a MakeEnv into the DownsweepEnv, gives the fields
  proper names and uses RecordWildcards to simplify, rather than passing
  around all diagnostic wrappers, driver-message-things and using 10s of
  positional fields.
  
  No behavior changes here!
  

• 52f385a7
  by sheaf at 2026-10-26T18:19:11-04:00

  Driver: enableCodeGenForTH in load', not downsweep
  
  enableCodeGenForTH modifies the module graph for planning, creating
  fresh temporary paths. So it should only be run when we are about to
  execute a build plan (e.g. in load'), so that consumers that want to
  know facts about the module graph don't go looking for files that don't
  exist yet (in particular 'haddock --no-compilation').
  

• 82402d14
  by sheaf at 2026-10-26T18:19:11-04:00

  2-phase Cache/Search Finder monad
  
  This commit restructures the finder abstraction by introducing the
  'FinderM' monad, which splits module lookup operations into two phases:
  
    - a cache-only phase, performing no filesystem access,
    - from the first cache miss onwards, a search action which may access
      the filesystem.
  
  This allows consumers to distinguish between quick cached results versus
  more expensive filesystem search operations.
  

• 5c302b40
  by sheaf at 2026-10-26T18:19:11-04:00

  Separate Home/External finder caches
  
  The caches for home modules and modules from external units have
  different lifetimes, needing to be invalidated at different points.
  
  This commit moves the cache for modules from external units into the
  'UnitState' type, which keeps the cache correct whenever package flags
  or package databases change (setSessionDynFlags, :set -package ...,
  Backpack's addUnit).
  
  This also makes it easier to clear the cache of home modules, as they
  are now stored separately (obviating the 'isUnitEnvInstalledModule'
  check we used to perform).
  

• 605fbb96
  by sheaf at 2026-10-26T18:19:11-04:00

  Add known home modules to the finder cache
  
  The finder looks in the file system for the on-disk source that
  corresponds to a Haskell module name. There are two kinds of modules
  where we need to bypass this search:
  
    - a file passed directly in the command line, which may not be in any
      search path and whose module name may differ from the file name;
    - Backpack signatures and modules, which do not exist as files at all.
  
  This commit handles these two situations by adding an immutable
  'KnownHomeModules' in the finder cache, which is always consulted first
  before doing any search.
  
  This removes the ad-hoc imperative logic which relied on mutating the
  finder cache at careful points.
  
  'setModuleGraph' now also takes the known home modules, so that the
  module graph and the known home modules are always set consistently.
  
  See Note [Known home modules] in GHC.Unit.Finder.Types.
  

• 82718f44
  by sheaf at 2026-10-26T18:19:11-04:00

  Make 'UnresolvedImport' into a suitable cache key
  
  The goal of this commit is to make 'UnresolvedImport' suitable for use
  as a cache key. Specifically, during downsweep we want to be able to
  cache module resolution queries. We want to do this using some kind of
  map, e.g. (roughly speaking):
  
    Map UnresolvedImport ResolvedImport
  
  For this to work, 'UnresolvedImport' must contain **precisely** the
  input data to each resolution computation. In other words:
  
    1. If something changes that materially affects resolution, it must
       be stored in the cache key.
    2. If changing some input does not materially affect the outcome,
       then it must not be stored in the cache key.
  
  To satisfy (1), we change 'UnitNode' to also keep track of the home
  unit in whose unit state the unit's dependencies were looked up.
  
  For (2), 'ImportResolution' now stores a 'ModuleLookupScope' instead of an
  'UnresolvedImportOrigin'. Plugin imports are expressed with a new
  'LookupPlugin' scope. The source location of an import, which is
  immaterial to the resolution, is stored out of band outside
  'UnresolvedImport', in 'ModSummary'.
  

• d4635c7c
  by sheaf at 2026-10-26T18:19:11-04:00

  Add GHC.Data.Dependent
  
  This commit adds a minimal implementation of dependent sums
  ('Some', 'DSum') and dependent maps ('DMap').
  
  The implementation is not entirely performance optimal, as there are a
  few extraneous allocations compared to the full-blown implementation in
  the 'dependent-map' package. For our use case (caching downsweep
  computations), this does not matter much.
  
  See GHC.Data.Dependent.
  

• 6759533e
  by sheaf at 2026-10-26T18:19:11-04:00

  Driver: structured concurrent worker abstraction
  
  This commit introduces a structured concurrency framework in the style
  of the 'ki' library: a collection of threads within a scope.
  
  We implement two kinds of concurrent workers on top of this framework:
  
    - Independent workers cannot wait for one another at all. The only
      scheduling operation is to wait for quiescence.
  
    - Coordinating workers declare an STM readiness condition (waiting on
      other workers to complete) which gates their start.
  
  See Note [Deterministic concurrent workers] in GHC.Driver.Concurrency.
  
  This commit ports upsweep to this new framework, with downsweep being
  left as subsequent work.
  
  Further changes along the way:
  
    - Refactoring of how concurrency is acquired to avoid the footgun of
      trying to use a no-op 'AbstractSem' as a lock in the serial case.
  
    - The "re-run with -j1" logic for semaphore opening errors no longer
      triggers on late semaphore failures (part-way through a lengthy
      computation).
  
    - Logger threads are properly cleaned up on exception, with each
      concurrent worker's log queue and local TmpFs properly bracketed.
  
    - The 'GhcMessage -> AnyGhcDiagnostic' and 'Maybe Messager'
      arguments of 'depanalE', 'depanalPartial' and 'downsweep', which
      were all dead in practice, have been dropped.
  
    - Concurrent logging has been completely overhauled. Each worker has
      its own log queue. Workers whose logs are printed as we go are
      spawned in the order in which their logs must be printed, now using
      a TQueue instead of the old complicated LogQueueQueue mechanism.
  
      'logThread' is replaced by 'withLogPrinter', which runs the thread
      that prints the log queues within a concurrent worker scope.
  
      These changes allow us to fix issues with the exception handling:
      we now always flush remaining log queues before exiting (even when
      the action throws an exception), and exceptions that arise while
      printing are properly rethrown. This fixes #28009.
  

• 38a99006
  by sheaf at 2026-10-26T18:19:11-04:00

  Rule-based deterministic concurrent downsweep
  
  This commit rewrites downsweep as a single query-answering rule
  (see 'DownsweepRule') that can be executed by concurrent worker threads.
  The design allows every expensive operation (preprocessing files with CPP,
  parsing headers, reading interfaces) to be performed concurrently
  according to the -j<N>/-jsem flags.
  See Note [Rules-based downsweep] in GHC.Driver.Downsweep.
  
  The rules are run by "GHC.Driver.Concurrency.runRules" in a demand-driven
  way: each worker can demand other workers to run, but never wait on
  another worker. Every piece of work is done at most once.
  
  Fixes #27514
  
  Memory usage can increase due to doing more work concurrently:
  
  -------------------------
  Metric Increase:
      MultiComponentModulesRecomp
      MultiComponentModulesRecomp100
      mhu-perf
  -------------------------
  

• 9fa7b7be
  by sheaf at 2026-10-26T18:19:11-04:00

  Acquire/release semaphore tokens more readily
  
  This commit reworks GHC.Driver.MakeSem to use the scoped worker
  abstraction of GHC.Utils.Concurrent.Scope. This allows us to get rid of
  a lot of the tricky logic in GHC.Driver.MakeSem involving manual
  exception handling, thread spawning and lifetime management, etc.
  
  The main user-visible change is that token acquisition is no longer
  rate limited (due to a bug, there previously was a 1s rate limit on
  acquisition of semaphore tokens), with the release debounce period
  shortened from 1s to 10ms.
  
  Other changes:
  
    - With -jsem, the number of capabilities is now capped at the number
      of processors, bringing it in line with the -jN behaviour.
    - Pending jobs whose wait for a token is interrupted by an exception
      are now withdrawn from the jobserver, instead of acquiring a token
      that it hung onto without doing useful work.
  
  Fixes #27763
  

• c83c6733
  by Alan Zimmerman at 2026-10-26T18:19:55-04:00

  EPA: Update AnnClsInstDecl to contain AnnList
  
  It was already separately tracking the '{', '}' and leading ';' values.
  This aligns it with layout-introducing parser productions ('vocurly'),
  so the layout processing can be handled uniformly
  

• ac870ad5
  by Simon Jakobi at 2026-10-28T04:40:42-04:00

  X86 NCG: use 32-bit POPCNT for sub-word popcounts
  
  A 32-bit write zero-extends the result to the full register, so we
  don't need to emit additional code for this.
  
  We also skip emitting zero-extension instructions for the argument
  when it is already visibly zero-extended.
  
  For the byte-wise popcount loop from #24813, this shrinks the popcount
  sequence from 5 instructions to 3.
  
  Assisted-by: Claude Fable 5.1
  

• 53087373
  by Facundo Domínguez at 2026-10-28T04:41:32-04:00

  Use a ShortByteString in Serialized instead of [Word8]
  
  This makes the in-memory representation 40x more compact for all values
  stored in annotations.
  
  A test is added to measure the representation size of annotations
  specified in the compiler input.
  
  The GHC API is modified. All functions that previously handled annotations
  in [Word8] form now use ShortByteString. The following definitions have
  modified types:
  
    * GHC.findGlobalAnns
    * GHC.Tc.Gen.Splice.getAnnotationsByTypeRep
    * GHC.Core.Opt.Monad.getAnnotations
    * GHC.Core.Opt.Monad.getFirstAnnotations
    * GHC.Types.Annotations.deserializeAnns
    * GHC.Types.Annotations.findAnns
    * GHC.Types.Annotations.findAnnsByTypeRep
    * GHC.Serialized.Serialized
    * GHC.Serialized.toSerialized
    * GHC.Serialized.fromSerialized
    * GHC.Serialized.serializeWithData
    * GHC.Serialized.deserializeWithData
    * GHCi.Message.ReifyAnnotations
  
  Fixes #28002.
  

• cc89e25b
  by Simon Jakobi at 2026-11-05T11:21:00+01:00

  NCG: iterate the liveness fixpoint until register formats converge
  
  The per-SCC liveness fixpoint in GHC.CmmToAsm.Reg.Liveness tested for
  convergence with the key-only `instance Eq Regs`, which ignored register
  formats (#27619). It also compared the entire accumulated block map on
  every iteration, making it quadratic in procedure size (#27437).
  
  We now compare only the current SCC's entries, using the new
  format-aware equalRegs. See Note [Convergence of the liveness fixpoint]
  and Note [Joining register formats].
  
  The problematic `instance Eq Regs` is deleted.
  
  Fixes #27619, fixes #27437.
  
  Assisted-by: Claude Opus 5.5
  

1120 changed files:

• .gitlab-ci.yml
• .gitlab/ci.sh
• .gitlab/hello.hs
• .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
• + changelog.d/24450
• + changelog.d/25665
• + changelog.d/25763-cmdline-opt
• + changelog.d/25850
• + changelog.d/26610
• changelog.d/26616
• + changelog.d/26761
• + changelog.d/27368
• + changelog.d/27556
• + changelog.d/27624
• + changelog.d/27627
• + changelog.d/27641
• + changelog.d/27703
• + changelog.d/27704
• + changelog.d/27717
• + changelog.d/27732
• + changelog.d/27845
• + changelog.d/27936
• + changelog.d/27971
• + changelog.d/28012
• + changelog.d/T23785
• + changelog.d/T26543
• changelog.d/T27202
• changelog.d/T27329
• + changelog.d/T27412
• changelog.d/T27455
• + changelog.d/T27545
• + changelog.d/T27629
• + changelog.d/T27657
• + changelog.d/T27705
• + changelog.d/T27722-cbe-entry-block.md
• + changelog.d/T27731
• + changelog.d/T27744
• + changelog.d/T27749
• + changelog.d/T27763
• + changelog.d/T27764
• + changelog.d/T27788-js-selector
• + changelog.d/T27828
• + changelog.d/T27830-rts-flag-bounds
• + changelog.d/T27831-bottoming-strict-field
• + changelog.d/T27842-bytecode-imported-tags
• + changelog.d/T27844
• + changelog.d/T27916
• + changelog.d/T28002
• + changelog.d/T28002-api
• + changelog.d/T4162
• + changelog.d/allow-gadt-prefix-con-parens
• + changelog.d/arm_ncg_fixes_T27430
• + changelog.d/boxing-family
• + changelog.d/clc-341-strict-mutable-data-types
• + changelog.d/clc-421
• + changelog.d/fix-compacting-gc-constr-27649
• + changelog.d/fix-control0-mask-trampoline
• + changelog.d/fix-cross-ghc-info-unit-id
• + changelog.d/fix-parallel-gc-selector-race-27477
• + changelog.d/fix-threadlabel-segfault-27618
• + changelog.d/hadrian-persist-flavour
• + changelog.d/hpc-classinsts
• + changelog.d/hpc-cleanup
• + changelog.d/implicit-field-strictness-warning
• changelog.d/lazy-field-annotations
• + changelog.d/llvm-23
• + changelog.d/monad-of-no-return-canonical
• + changelog.d/ncg-x86-bit-test-instructions
• + changelog.d/ncg-x86-subword-popcnt
• + changelog.d/parallel-downsweep
• + changelog.d/resizeMutableByteArray-pinnedness
• + changelog.d/rethrow-stm
• + changelog.d/select-io-manager
• changelog.d/semaphore-v2
• changelog.d/tcplugin_init.md
• + changelog.d/unboxed-do
• changelog.d/unit-index
• + changelog.d/zap-coercions
• compiler/GHC.hs
• compiler/GHC/Builtin.hs
• compiler/GHC/Builtin/KnownKeys.hs
• compiler/GHC/Builtin/Modules.hs
• compiler/GHC/Builtin/Uniques.hs
• compiler/GHC/Builtin/WiredIn/Ids.hs
• compiler/GHC/Builtin/WiredIn/Prim.hs
• compiler/GHC/Builtin/WiredIn/TypeLits.hs
• compiler/GHC/Builtin/WiredIn/Types.hs
• + compiler/GHC/Builtin/WiredIn/Types/Box.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Show.hs
• compiler/GHC/Cmm/CommonBlockElim.hs
• compiler/GHC/Cmm/DebugBlock.hs
• compiler/GHC/Cmm/Expr.hs
• compiler/GHC/Cmm/GenericOpt.hs
• compiler/GHC/Cmm/Lint.hs
• compiler/GHC/Cmm/MachOp.hs
• compiler/GHC/Cmm/Parser.y
• compiler/GHC/Cmm/UniqueRenamer.hs
• compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
• compiler/GHC/CmmToAsm/AArch64/Instr.hs
• compiler/GHC/CmmToAsm/AArch64/Ppr.hs
• compiler/GHC/CmmToAsm/CFG/Dominators.hs
• compiler/GHC/CmmToAsm/Dwarf/Types.hs
• compiler/GHC/CmmToAsm/Format.hs
• compiler/GHC/CmmToAsm/Monad.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Spill.hs
• compiler/GHC/CmmToAsm/Reg/Graph/SpillClean.hs
• compiler/GHC/CmmToAsm/Reg/Graph/SpillCost.hs
• compiler/GHC/CmmToAsm/Reg/Graph/Stats.hs
• compiler/GHC/CmmToAsm/Reg/Linear/State.hs
• compiler/GHC/CmmToAsm/Reg/Linear/Stats.hs
• compiler/GHC/CmmToAsm/Reg/Liveness.hs
• compiler/GHC/CmmToAsm/Reg/Regs.hs
• compiler/GHC/CmmToAsm/Wasm/Asm.hs
• compiler/GHC/CmmToAsm/Wasm/Types.hs
• compiler/GHC/CmmToAsm/X86/CodeGen.hs
• compiler/GHC/CmmToAsm/X86/Instr.hs
• compiler/GHC/CmmToAsm/X86/Ppr.hs
• compiler/GHC/CmmToC.hs
• compiler/GHC/CmmToLlvm/CodeGen.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Class.hs
• compiler/GHC/Core/Coercion.hs
• compiler/GHC/Core/Coercion.hs-boot
• compiler/GHC/Core/Coercion/Axiom.hs
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/DataCon.hs
• compiler/GHC/Core/FVs.hs
• compiler/GHC/Core/FamInstEnv.hs
• compiler/GHC/Core/Lint.hs
• + compiler/GHC/Core/Lint.hs-boot
• compiler/GHC/Core/Make.hs
• + compiler/GHC/Core/Make/BigTuple.hs
• + compiler/GHC/Core/Make/Box.hs
• compiler/GHC/Core/Map/Type.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/CallerCC.hs
• compiler/GHC/Core/Opt/CallerCC/Types.hs
• compiler/GHC/Core/Opt/Exitify.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/Pipeline.hs
• compiler/GHC/Core/Opt/SetLevels.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/WorkWrap/Utils.hs
• compiler/GHC/Core/Reduction.hs
• compiler/GHC/Core/Seq.hs
• compiler/GHC/Core/SimpleOpt.hs
• compiler/GHC/Core/Subst.hs
• compiler/GHC/Core/TyCo/Compare.hs
• compiler/GHC/Core/TyCo/FVs.hs
• compiler/GHC/Core/TyCo/FVs.hs-boot
• + compiler/GHC/Core/TyCo/Make.hs
• + compiler/GHC/Core/TyCo/Make.hs-boot
• compiler/GHC/Core/TyCo/Ppr.hs
• compiler/GHC/Core/TyCo/Rep.hs
• compiler/GHC/Core/TyCo/Rep.hs-boot
• compiler/GHC/Core/TyCo/Subst.hs
• compiler/GHC/Core/TyCo/Tidy.hs
• compiler/GHC/Core/TyCon.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Type.hs-boot
• compiler/GHC/Core/Unify.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToIface.hs
• compiler/GHC/CoreToIface.hs-boot
• compiler/GHC/CoreToStg.hs
• compiler/GHC/CoreToStg/AddImplicitBinds.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/BooleanFormula.hs
• + compiler/GHC/Data/Dependent.hs
• compiler/GHC/Data/FastString.hs
• compiler/GHC/Data/OrdList.hs
• compiler/GHC/Data/OsPath.hs
• compiler/GHC/Data/Pair.hs
• + compiler/GHC/Data/StringTrie.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/Data/Word64Set/Internal.hs
• compiler/GHC/Driver/Backpack.hs
• compiler/GHC/Driver/CmdLine.hs
• + compiler/GHC/Driver/Concurrency.hs
• compiler/GHC/Driver/Config.hs
• + compiler/GHC/Driver/Config/Concurrency.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env.hs
• compiler/GHC/Driver/Errors/Ppr.hs
• compiler/GHC/Driver/Errors/Types.hs
• compiler/GHC/Driver/Flags.hs
• compiler/GHC/Driver/GenerateCgIPEStub.hs
• compiler/GHC/Driver/Main/Compile.hs
• compiler/GHC/Driver/Main/Passes.hs
• compiler/GHC/Driver/Make.hs
• compiler/GHC/Driver/MakeAction.hs
• compiler/GHC/Driver/MakeFile.hs
• compiler/GHC/Driver/MakeSem.hs
• compiler/GHC/Driver/Pipeline.hs-boot
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Pipeline/LogQueue.hs
• compiler/GHC/Driver/Pipeline/Phases.hs
• compiler/GHC/Driver/Session.hs
• compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs.hs
• compiler/GHC/Hs/Decls.hs
• compiler/GHC/Hs/Doc.hs
• compiler/GHC/Hs/Dump.hs
• compiler/GHC/Hs/Expr.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/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Arrows.hs
• compiler/GHC/HsToCore/Binds.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Expr.hs
• compiler/GHC/HsToCore/ListComp.hs
• compiler/GHC/HsToCore/Match/Literal.hs
• compiler/GHC/HsToCore/Pmc/Types.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Utils.hs
• compiler/GHC/Iface/Binary.hs
• compiler/GHC/Iface/Decl.hs
• compiler/GHC/Iface/Errors/Types.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Debug.hs
• compiler/GHC/Iface/Ext/Types.hs
• compiler/GHC/Iface/Ext/Utils.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/Rename.hs
• compiler/GHC/Iface/Syntax.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Tidy/StaticPtrTable.hs
• compiler/GHC/Iface/Type.hs
• compiler/GHC/Iface/Type.hs-boot
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/JS/Opt/Simple.hs
• compiler/GHC/Linker/Deps.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/Header.hs
• compiler/GHC/Parser/Lexer.x
• compiler/GHC/Parser/PostProcess.hs
• compiler/GHC/Parser/PostProcess/Haddock.hs
• compiler/GHC/Parser/String.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.hs
• compiler/GHC/Rename/HsType.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/Runtime/Eval/Types.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter/JS.hs
• compiler/GHC/Runtime/Loader.hs
• compiler/GHC/Settings.hs
• compiler/GHC/Settings/IO.hs
• compiler/GHC/Stg/BcPrep.hs
• compiler/GHC/Stg/Debug.hs
• compiler/GHC/Stg/EnforceEpt.hs
• compiler/GHC/Stg/EnforceEpt/Rewrite.hs
• compiler/GHC/Stg/EnforceEpt/TagSig.hs
• compiler/GHC/Stg/EnforceEpt/Types.hs
• compiler/GHC/Stg/Lint.hs
• compiler/GHC/Stg/Subst.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/CodeGen.hs
• compiler/GHC/StgToJS/ExprCtx.hs
• compiler/GHC/StgToJS/Linker/Linker.hs
• compiler/GHC/StgToJS/Object.hs
• compiler/GHC/StgToJS/Prim.hs
• compiler/GHC/StgToJS/Symbols.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/Errors.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Expr.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Match.hs
• compiler/GHC/Tc/Gen/Pat.hs
• compiler/GHC/Tc/Gen/Splice.hs
• compiler/GHC/Tc/Instance/Family.hs
• compiler/GHC/Tc/Instance/FunDeps.hs
• compiler/GHC/Tc/Instance/Typeable.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Plugin.hs
• compiler/GHC/Tc/Solver/Default.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/Solver/Solve.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Class.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/Constraint.hs
• compiler/GHC/Tc/Types/ErrCtxt.hs
• compiler/GHC/Tc/Utils/Backpack.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/Zonk/Env.hs
• compiler/GHC/Tc/Zonk/Monad.hs
• compiler/GHC/Tc/Zonk/TcType.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Annotations.hs
• compiler/GHC/Types/Arity.hs
• compiler/GHC/Types/Basic.hs
• compiler/GHC/Types/CompleteMatch.hs
• compiler/GHC/Types/Cpr.hs
• compiler/GHC/Types/Demand.hs
• compiler/GHC/Types/Error/Codes.hs
• compiler/GHC/Types/Hint.hs
• compiler/GHC/Types/Hint/Ppr.hs
• compiler/GHC/Types/Id.hs
• compiler/GHC/Types/Id/Info.hs
• compiler/GHC/Types/Id/Make.hs
• compiler/GHC/Types/Literal.hs
• compiler/GHC/Types/Name/Env.hs
• compiler/GHC/Types/Name/Occurrence.hs
• compiler/GHC/Types/Tickish.hs
• compiler/GHC/Types/TyThing.hs
• compiler/GHC/Types/TyThing/Ppr.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/Unique/DFM.hs
• compiler/GHC/Types/Unique/DSM.hs
• compiler/GHC/Types/Unique/DSet.hs
• compiler/GHC/Types/Unique/FM.hs
• compiler/GHC/Types/Unique/Map.hs
• compiler/GHC/Types/Unique/Set.hs
• compiler/GHC/Types/Unique/Supply.hs
• compiler/GHC/Types/UnresolvedImport.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Types/Var.hs-boot
• compiler/GHC/Types/Var/FV.hs
• compiler/GHC/Types/Var/Set.hs
• compiler/GHC/Unit/Env.hs
• compiler/GHC/Unit/External/Database.hs
• compiler/GHC/Unit/External/ModuleOrigin.hs
• compiler/GHC/Unit/External/Visibility.hs
• compiler/GHC/Unit/External/Wired.hs
• compiler/GHC/Unit/Finder.hs
• + compiler/GHC/Unit/Finder/Cache.hs
• compiler/GHC/Unit/Finder/Types.hs
• compiler/GHC/Unit/Home.hs
• compiler/GHC/Unit/Module.hs
• compiler/GHC/Unit/Module/Env.hs
• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/ModSummary.hs
• + compiler/GHC/Unit/Module/Name.hs
• compiler/GHC/Unit/Module/WholeCoreBindings.hs
• compiler/GHC/Unit/Parser.hs
• compiler/GHC/Unit/State.hs
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Unit/Types.hs-boot
• compiler/GHC/Utils/Binary.hs
• + compiler/GHC/Utils/Concurrent/Scope.hs
• compiler/GHC/Utils/Monad/Codensity.hs
• + compiler/GHC/Utils/Monad/StrictIdentity.hs
• + compiler/GHC/Utils/Monad/StrictReader.hs
• compiler/GHC/Utils/Monad/State/Strict.hs → compiler/GHC/Utils/Monad/StrictState.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Panic.hs
• compiler/GHC/Utils/Ppr/Colour.hs
• compiler/GHC/Utils/TmpFs.hs
• compiler/Language/Haskell/Syntax.hs
• compiler/Language/Haskell/Syntax/BooleanFormula.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Lit.hs
• compiler/Language/Haskell/Syntax/Module/Name.hs
• compiler/Language/Haskell/Syntax/Specificity.hs
• compiler/Language/Haskell/Syntax/Text.hs
• compiler/Language/Haskell/Syntax/Type.hs
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• docs/users_guide/extending_ghc.rst
• docs/users_guide/exts/gadt_syntax.rst
• docs/users_guide/exts/literals.rst
• docs/users_guide/exts/qualified_do.rst
• docs/users_guide/exts/strict.rst
• docs/users_guide/exts/type_data.rst
• docs/users_guide/exts/type_families.rst
• docs/users_guide/runtime_control.rst
• docs/users_guide/using-warnings.rst
• ghc/GHC/Driver/Session/Mode.hs
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Info.hs
• ghc/Main.hs
• ghc/ghc-bin.cabal.in
• hadrian/README.md
• hadrian/bindist/Makefile
• hadrian/bindist/config.mk.in
• hadrian/doc/cross-compile.md
• hadrian/doc/flavours.md
• hadrian/doc/make.md
• hadrian/doc/windows.md
• hadrian/ghci-multi-cabal.in
• hadrian/hadrian.cabal
• hadrian/src/Base.hs
• hadrian/src/Builder.hs
• hadrian/src/CommandLine.hs
• hadrian/src/Flavour.hs
• hadrian/src/Hadrian/Builder.hs
• hadrian/src/Hadrian/Builder/Ar.hs
• hadrian/src/Hadrian/Haskell/Cabal/Parse.hs
• hadrian/src/Hadrian/Haskell/Cabal/Type.hs
• hadrian/src/Hadrian/Oracles/Path.hs
• hadrian/src/Hadrian/Utilities.hs
• hadrian/src/Main.hs
• hadrian/src/Oracles/Setting.hs
• hadrian/src/Oracles/TestSettings.hs
• hadrian/src/Rules.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/Changelog.hs
• hadrian/src/Rules/Codes.hs
• hadrian/src/Rules/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Lint.hs
• hadrian/src/Rules/Nofib.hs
• hadrian/src/Rules/Selftest.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Ar.hs
• − hadrian/src/Settings/Flavours/Quickest.hs
• hadrian/src/Settings/Warnings.hs
• libraries/base/base.cabal.in
• libraries/base/changelog.md
• libraries/base/src/Control/Concurrent/Chan.hs
• + libraries/base/src/Control/Concurrent/Chan/Strict.hs
• libraries/base/src/Control/Concurrent/MVar.hs
• + libraries/base/src/Control/Concurrent/MVar/Strict.hs
• libraries/base/src/Data/IORef.hs
• + libraries/base/src/Data/IORef/Strict.hs
• + libraries/base/src/Data/RealFloat.hs
• libraries/base/src/GHC/Base.hs
• libraries/base/src/GHC/Conc.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/RTS/Flags.hs
• + libraries/base/tests/IO/T27971.hs
• + libraries/base/tests/IO/T27971.stdout
• libraries/base/tests/IO/all.T
• libraries/base/tests/Memo1.lhs
• libraries/base/tests/Memo2.lhs
• libraries/base/tests/all.T
• libraries/containers
• libraries/ghc-boot/GHC/Serialized.hs
• libraries/ghc-internal/CHANGELOG.md
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/include/RtsIfaceSymbols.h
• libraries/ghc-internal/src/GHC/Internal/Base.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/GMP.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
• 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
• + libraries/ghc-internal/src/GHC/Internal/Box.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Thread.hs
• libraries/ghc-internal/src/GHC/Internal/Event/Windows.hsc
• libraries/ghc-internal/src/GHC/Internal/Event/Windows/FFI.hsc
• libraries/ghc-internal/src/GHC/Internal/Exts.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/IO/Windows/Handle.hsc
• libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
• libraries/ghc-internal/src/GHC/Internal/STM.hs
• libraries/ghc-internal/src/GHC/Internal/TypeNats.hs
• libraries/ghc-internal/src/GHC/Internal/Types.hs
• + libraries/ghc-internal/src/GHC/Internal/Unboxed/Do.hs
• libraries/ghci/GHCi/Message.hs
• libraries/ghci/GHCi/TH.hs
• libraries/ghci/GHCi/TH/Binary.hs
• libraries/stm
• linters/lint-codes/LintCodes/Static.hs
• m4/find_python.m4
• + m4/fp_canonicalise_win_path.m4
• m4/fp_find_nm.m4
• m4/fp_find_root.m4
• m4/fp_prog_ar.m4
• m4/fp_prog_ar_args.m4
• m4/fp_prog_sh.m4
• m4/fptools_alex.m4
• m4/fptools_happy.m4
• m4/subst_tooldir.m4
• rts/Capability.c
• rts/CloneStack.c
• rts/Continuation.c
• rts/ContinuationOps.cmm
• rts/HeapStackCheck.cmm
• rts/IOManager.c
• rts/IOManager.h
• rts/IOManagerInternals.h
• rts/Interpreter.c
• rts/Messages.c
• rts/Prelude.h
• rts/PrimOps.cmm
• rts/Printer.c
• rts/ProfHeap.c
• rts/RaiseAsync.c
• rts/RtsFlags.c
• rts/RtsStartup.c
• rts/RtsSymbols.c
• rts/STM.c
• rts/Schedule.c
• rts/Sparks.c
• rts/StableName.c
• rts/StgMiscClosures.cmm
• rts/ThreadPaused.c
• rts/Threads.c
• rts/Threads.h
• rts/Trace.h
• rts/configure.ac
• rts/eventlog/EventLog.c
• rts/include/rts/Flags.h
• rts/include/rts/RtsToHsIface.h
• rts/include/rts/storage/Closures.h
• rts/include/rts/storage/GC.h
• rts/include/stg/MiscClosures.h
• rts/include/stg/Prim.h
• rts/js/environment.js
• rts/linker/elf_reloc_riscv64.c
• rts/posix/Poll.c
• rts/posix/Poll.h
• rts/posix/Select.c
• + rts/posix/SelectBis.c
• + rts/posix/SelectBis.h
• rts/posix/Timeout.c
• rts/posix/Timeout.h
• rts/prim/atomic.c
• rts/prim/bitrev.c
• rts/prim/bswap.c
• rts/rts.cabal
• rts/sm/Compact.c
• rts/sm/Evac.c
• rts/sm/GC.c
• rts/sm/GCUtils.c
• rts/sm/MBlock.c
• rts/sm/NonMoving.c
• rts/sm/NonMovingMark.c
• rts/sm/Storage.c
• rts/sm/Sweep.c
• testsuite/driver/README.md
• testsuite/driver/junit.py
• testsuite/driver/perf_notes.py
• testsuite/driver/runtests.py
• testsuite/driver/testglobals.py
• testsuite/driver/testlib.py
• testsuite/tests/MiniQuickCheck.hs
• testsuite/tests/ado/ado-optimal.hs
• testsuite/tests/ado/ado001.hs
• testsuite/tests/annotations/should_run/Makefile
• + testsuite/tests/annotations/should_run/T16841.hs
• + testsuite/tests/annotations/should_run/T16841.stdout
• testsuite/tests/annotations/should_run/all.T
• testsuite/tests/arrows/should_run/all.T
• + testsuite/tests/arrows/should_run/arrowrun005.hs
• + testsuite/tests/arrows/should_run/arrowrun005.stdout
• + testsuite/tests/backpack/should_compile/T27835.bkp
• + testsuite/tests/backpack/should_compile/T27835.stderr
• testsuite/tests/backpack/should_compile/all.T
• + testsuite/tests/bytecode/T27633/Obj.hs
• + testsuite/tests/bytecode/T27633/T27633a.hs
• + testsuite/tests/bytecode/T27633/T27633a.stdout
• + testsuite/tests/bytecode/T27633/T27633b.hs
• + testsuite/tests/bytecode/T27633/T27633b.stdout
• + testsuite/tests/bytecode/T27633/all.T
• + testsuite/tests/bytecode/T27842.hs
• + testsuite/tests/bytecode/T27842.stdout
• + testsuite/tests/bytecode/T27842A.hs
• + testsuite/tests/bytecode/T27842N.hs
• testsuite/tests/bytecode/all.T
• testsuite/tests/cmm/should_compile/Makefile
• + testsuite/tests/cmm/should_compile/T27368-ppr-debug.stderr
• − testsuite/tests/cmm/should_compile/T27368-ppr-debug.stdout
• testsuite/tests/cmm/should_compile/all.T
• + testsuite/tests/codeGen/should_compile/T27368.hs
• testsuite/tests/codeGen/should_compile/all.T
• + testsuite/tests/codeGen/should_gen_asm/T24813.asm
• + testsuite/tests/codeGen/should_gen_asm/T24813.cmm
• + testsuite/tests/codeGen/should_gen_asm/T25233.asm
• + testsuite/tests/codeGen/should_gen_asm/T25233.hs
• + testsuite/tests/codeGen/should_gen_asm/T25233b.asm
• + testsuite/tests/codeGen/should_gen_asm/T25233b.cmm
• testsuite/tests/codeGen/should_gen_asm/all.T
• + testsuite/tests/codeGen/should_run/T27430.hs
• + testsuite/tests/codeGen/should_run/T27430.stdout
• + testsuite/tests/codeGen/should_run/T27430_c.c
• + testsuite/tests/codeGen/should_run/T27533.hs
• + testsuite/tests/codeGen/should_run/T27533.stdout
• + testsuite/tests/codeGen/should_run/T27533_cmm.cmm
• + testsuite/tests/codeGen/should_run/T27537.hs
• + testsuite/tests/codeGen/should_run/T27537.stdout
• + testsuite/tests/codeGen/should_run/T27538.hs
• + testsuite/tests/codeGen/should_run/T27538.stdout
• + testsuite/tests/codeGen/should_run/T27624.hs
• + testsuite/tests/codeGen/should_run/T27624.stdout
• testsuite/tests/codeGen/should_run/all.T
• testsuite/tests/concurrent/T13615/Parallel.hs
• testsuite/tests/concurrent/should_run/T21651.hs
• + testsuite/tests/concurrent/should_run/T27657a.hs
• + testsuite/tests/concurrent/should_run/T27657a.stdout
• + testsuite/tests/concurrent/should_run/T27657b.hs
• + testsuite/tests/concurrent/should_run/T27657b.stdout
• testsuite/tests/concurrent/should_run/all.T
• testsuite/tests/concurrent/should_run/setnumcapabilities001.hs
• + testsuite/tests/core-to-stg/T27627/Callee.hs
• + testsuite/tests/core-to-stg/T27627/Caller.hs
• + testsuite/tests/core-to-stg/T27627/Main.hs
• + testsuite/tests/core-to-stg/T27627/T27627.stdout
• + testsuite/tests/core-to-stg/T27627/all.T
• + testsuite/tests/core-to-stg/T27627a/Callee.hs
• + testsuite/tests/core-to-stg/T27627a/Caller.hs
• + testsuite/tests/core-to-stg/T27627a/Main.hs
• + testsuite/tests/core-to-stg/T27627a/T27627a.stdout
• + testsuite/tests/core-to-stg/T27627a/all.T
• + testsuite/tests/core-to-stg/T27627b/Callee.hs
• + testsuite/tests/core-to-stg/T27627b/Caller.hs
• + testsuite/tests/core-to-stg/T27627b/Main.hs
• + testsuite/tests/core-to-stg/T27627b/T27627b.stdout
• + testsuite/tests/core-to-stg/T27627b/all.T
• + testsuite/tests/core-to-stg/T27627c/Callee.hs
• + testsuite/tests/core-to-stg/T27627c/Caller.hs
• + testsuite/tests/core-to-stg/T27627c/Main.hs
• + testsuite/tests/core-to-stg/T27627c/T27627c.stdout
• + testsuite/tests/core-to-stg/T27627c/all.T
• + testsuite/tests/core-to-stg/T27627e.hs
• + testsuite/tests/core-to-stg/T27627e.stdout
• + testsuite/tests/core-to-stg/T27627f/Callee.hs
• + testsuite/tests/core-to-stg/T27627f/Caller.hs
• + testsuite/tests/core-to-stg/T27627f/Inst.hs
• + testsuite/tests/core-to-stg/T27627f/Main.hs
• + testsuite/tests/core-to-stg/T27627f/T27627f.stdout
• + testsuite/tests/core-to-stg/T27627f/all.T
• + testsuite/tests/core-to-stg/T27704/Callee.hs
• + testsuite/tests/core-to-stg/T27704/Callee.hs-boot
• + testsuite/tests/core-to-stg/T27704/Main.hs
• + testsuite/tests/core-to-stg/T27704/Mid.hs
• + testsuite/tests/core-to-stg/T27704/T27704.stdout
• + testsuite/tests/core-to-stg/T27704/all.T
• + testsuite/tests/core-to-stg/T27704a/Callee.hs
• + testsuite/tests/core-to-stg/T27704a/Callee.hs-boot
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• testsuite/tests/typecheck/should_fail/mc24.stderr
• testsuite/tests/typecheck/should_fail/tcfail019.stderr
• testsuite/tests/typecheck/should_fail/tcfail189.stderr
• + testsuite/tests/warnings/should_compile/RedundantCanonicalMethods.hs
• + testsuite/tests/warnings/should_compile/RedundantCanonicalMethods.stderr
• + testsuite/tests/warnings/should_compile/T16836a.hs
• + testsuite/tests/warnings/should_compile/T16836a.stderr
• + testsuite/tests/warnings/should_compile/T16836b.hs
• + testsuite/tests/warnings/should_compile/T16836c.hs
• + testsuite/tests/warnings/should_compile/T16836c.stderr
• + testsuite/tests/warnings/should_compile/T16836d.hs
• + testsuite/tests/warnings/should_compile/T16836d.stderr
• testsuite/tests/warnings/should_compile/WarnNoncanonical.hs
• testsuite/tests/warnings/should_compile/WarnNoncanonical.stderr
• testsuite/tests/warnings/should_compile/all.T
• + testsuite/tests/warnings/should_fail/WExpectedNoArgError.stderr
• testsuite/tests/warnings/should_fail/all.T
• utils/check-exact/ExactPrint.hs
• utils/check-exact/Main.hs
• utils/check-exact/Parsers.hs
• utils/check-exact/Transform.hs
• utils/check-exact/Utils.hs
• utils/check-ppr/Main.hs
• utils/count-deps/Main.hs
• utils/deriveConstants/Main.hs
• utils/dump-decls/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
• 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/Renderer.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Utils.hs
• utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
• utils/haddock/haddock-api/src/Haddock/Convert.hs
• utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
• utils/haddock/haddock-api/src/Haddock/Interface.hs
• utils/haddock/haddock-api/src/Haddock/Interface/ParseModuleHeader.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/haddock-api/src/Haddock/Utils/Json.hs
• utils/haddock/haddock-api/test/Haddock/Backends/Hyperlinker/ParserSpec.hs
• utils/haddock/haddock-library/haddock-library.cabal
• utils/haddock/haddock.cabal
• utils/hsc2hs
• utils/jsffi/dyld.mjs
• utils/runghc/Main.hs

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