Sylvain Henry pushed to branch wip/mangoiv/hadrian-uncompressed-tar at Glasgow Haskell Compiler / GHC

Commits:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add a FIXME note in the Poll I/O manager
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Use BlockInfoForceNonClosure in the select I/O manager
  

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

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

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

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

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

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

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

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

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

  Remove duplicate assertion
  

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

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

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

  Add a changelog entry
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  GHC Guide: Improve docs on response files
  

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

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

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

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

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

  Fix note typo
  

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

  Apply oneShot Monad trick to STG LintM
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  Add support for textual output of bytecode file content
  

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

  Add law in qualified strings doc
  

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

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

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

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

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

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

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

  EPA: Remove al_trailing from AnnList
  
  It was not being used
  

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

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

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

  Simplify comparison in DFM.hs
  
  Fixes #27669
  

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  cmmLint: Lint against MO_FS_Truncate subword use.
  

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

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

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

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

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

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

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

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

• 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.
  

• cc533b66
  by Sasha Bogicevic at 2026-10-31T09:18:15-04:00

  Don't report -XStrict-generated bangs under -Wredundant-bang-patterns
  
  The -XStrict flag causes the desugarer to insert bang patterns.
  These are not user-written, so -Wredundant-bang-patterns must not
  report them.
  
  To achieve this, the desugarer now tracks whether it is desugaring
  compiler-generated code (similar to the typechecker's 'tcl_in_gen_code').
  Bangs inserted by -XStrict are given generated spans, which suppresses
  the "redundant bang" warnings without otherwise affecting pattern-match
  warnings.
  
  Fixes #27323
  

• 13d38047
  by Luite Stegeman at 2026-10-31T09:19:11-04:00

  rts: tombstone Weak# copies that lose an evacuation race (#23160)
  
  Mark the losing copy of a Weak# during an evacuation race in parallel
  GC with stg_DEAD_WEAK_info. This ensures that the nonmoving GC
  doesn't follow dangling pointers, leading to crashes.
  
  Fixes #23160
  

• 63347328
  by Zubin Duggal at 2026-10-31T09:19:52-04:00

  ghci: Drop GHCi's exception context when rethrowing in ghc -e
  
  Fixes #27847.
  

• a85fef3f
  by Zubin Duggal at 2026-10-31T09:19:52-04:00

  base: Preserve exception context in modifyIOError
  
  Fixes #27851.
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/446
  

• 1d60b591
  by Zubin Duggal at 2026-10-31T09:19:52-04:00

  base: Preserve exception context in mapException
  
  Fixes #27851.
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/446
  

• 3c029a1b
  by Zubin Duggal at 2026-10-31T09:19:52-04:00

  base: Preserve exception context when rethrowing exceptions in Handle reads
  
  Fixes #27875.
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
  

• ab2b317a
  by Zubin Duggal at 2026-10-31T09:19:52-04:00

  base: Preserve exception context when rethrowing exceptions in hClose
  
  Fixes #27875.
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
  

• f5abf277
  by Zubin Duggal at 2026-10-31T09:19:52-04:00

  base: Preserve exception context when rethrowing exceptions in Windows openFile
  
  Fixes #27875.
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
  

• d842c672
  by Zubin Duggal at 2026-10-31T09:19:52-04:00

  base: Preserve exception context when rethrowing exceptions in executablePath
  
  Fixes #27875.
  CLC proposal: https://github.com/haskell/core-libraries-committee/issues/447
  

• c5a8bb9f
  by Simon Peyton Jones at 2026-10-31T09:20:34-04:00

  Simplify a tc-trace which could crash the compiler
  
  The trace formatted an error message, which prematurely
  read the ExpType in a FunResCtxt.
  
  Solution: don't put call the error message formatting
  when tc-tracing.
  

• ab49b1d2
  by Simon Peyton Jones at 2026-10-31T09:20:34-04:00

  Tiny comment change to uniqAway
  

• 6efe4ba3
  by Simon Peyton Jones at 2026-10-31T09:20:34-04:00

  Make niFixSubst idempotent
  
  I discovered (when fixing #27994) that `niFixSubst` didn't actually
  generate an idempotent subsitution despite its claims.  It could
  return a substitution that mentions domain variables on in its range,
  when those variables are hidden inside the kind of a type variable
  occurrence.  As a result it can generate ill-kinded types. Boo!
  
  The fix is simple, and uses deep substitution.
  See Note [Finding the substitution fixpoint]
  
  I don't think it actually /caused/ any bugs, so there is no
  regression test.
  

• 3b60ae7e
  by Simon Peyton Jones at 2026-10-31T09:20:34-04:00

  Fix a nasty bug in fundeps
  
  This MR fixes #27994, which turned out to be very tricky.
  
  See Note [Exploiting closed type famililes], especially (CF7).  I was
  ending up with TyVars (not TcTyVars) in the solver, because the
  substitution computed in `getRelevantBranches` mixed the two.
  
  The code was just too clever. I ended up simplifying it quite a bit.
  For /closed/ families we no longer call `trimQtvs` (was `trim_qtvs`).
  
  Open families still do use `trimQtvs`.  See Note [trimQTvs]
  
  This patch also fixes one other buglet in the same code.
  
  * Over-saturated type families were being mis-handled.
    See the new use of `saturatedFamApp_maybe`.
  

• e4610f2d
  by Facundo Domínguez at 2026-10-31T09:21:24-04:00

  Have haddock --incremental look for the module in -this-unit-id
  

• bc6c0db6
  by sheaf at 2026-10-31T09:22:20-04:00

  mightBeFunTy: hotfix for #27979
  
  ce01ccb6 refactored 'GHC.Types.RepType.mightBeFunTy' to look through
  unary classes. That change introduced the helper function 'unwrap_type'
  which was supposed to always return an unwrapped type, but its fallback
  equation mistakenly returned the original type. This caused the
  subsequent 'tyConAppTyCon_maybe' to fail in cases where it should
  succeed (e.g. looking through foralls).
  
  In this commit, we move all the unary class unwrapping logic into
  'unwrapType' where it belonged from the start, and update the
  documentation of 'unwrapType' to better explain what it should be used
  for (#26695).
  
  Fixes #27979 #26695
  
  -------------------------
  Metric Increase:
      T5642
  -------------------------
  

• 233cce46
  by Alan Zimmerman at 2026-10-31T09:23:01-04:00

  EPA: Tidy up ExactPrint.markAnnListA' 
  
  It takes an action which can modify the AnnList, but this
  is never used. So remove it.
  

• 3594a908
  by Sylvain Henry at 2026-10-31T09:23:51-04:00

  gitmodules: ignore dirty libffi-clib submodule (#26785)
  
  `./boot` runs autoreconf in libraries/libffi-clib, which leaves
  `configure~` behind and rewrites the tracked `aclocal.m4` whenever the
  local automake version differs from the one that generated it. Every
  checkout then looks dirty. Ignore working-tree changes in the submodule
  (`ignore = dirty`); a changed submodule commit is still reported.
  
  Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
  

• 341223c0
  by Rodrigo Mesquita at 2026-10-31T09:24:33-04:00

  refactor: Keep the interactive Ids directly rather than Name
  
  Removes things like
  
      names <- map idName ids
      map (\i -> let id = find (\x -> i==idName x) names) idso
  
  and is more straightforward because there's less state going around (no
  more updating HscEnv as an output)
  
  It also kills `printTypeOfNames` completely, since now we just have the
  Ids. No longer `lookupName` names to get back the ids...
  
  ```
  printTypeOfName :: GHC.GhcMonad m => Name -> m ()
  printTypeOfName n
     = do maybe_tything <- GHC.lookupName n
          case maybe_tything of
              Nothing    -> return ()
              Just thing -> printTyThing thing
  ```
  
  now is just `printTyThing . AnId`
  
  Also:
  ```diff
  -  tythings <- catMaybes `liftM` mapM GHC.lookupName namesSorted
  -  docs <- mapM pprTypeAndContents [i | AnId i <- tythings]
  +  docs <- mapM pprTypeAndContents idsSorted
  ```
  
  (and yes, in ExecBreaks there are only Ids, no TyThings, bc they are
  only constructed by the interpreter execution which can only bind ids.
  for TyThings use runDecls which doesn't return execBreaks.)
  
  There's some care to be had to make sure we use the "most refined" Ids,
  whereas when using `Name`s we'd always fetch the most refined Id from
  scratch.
  
  Fixes #28052
  

• 54cf3c1e
  by sheaf at 2026-11-03T07:00:23-05:00

  Consolidate all CPU feature handling
  
  This commit introduces GHC.Platform.CpuFeatures which consolidates all
  of the logic for implications between CPU feature flags (mainly X86):
  
    - DynFlags now only records the set of -m<feature> flags that were
      passed, as an EnumSet CpuFeature. That keeps it a simple record of
      the flags the user passed, with no post-processing.
  
    - GHC.Platform.CpuFeatures.initCpuFeatures turns this set into a
      CpuFeatures value, applying all implications and the per-architecture
      baseline. This is the single home for all of the feature implication
      logic.
  
      Some datatypes were reworked to better reflect the implication
      structure in the types, e.g. SseAvxVersion has a strategically
      placed 'FMA' boolean.
  
    - The NCG, LLVM backend, StgToCmm, CPP defines and LLVM -mattr
      flags all consult CpuFeatures, via targetCpuFeatures.
  
  See Note [CPU features], which replaces
  Note [Implications between X86 CPU feature flags].
  
  Behaviour changes:
  
    - x86 feature flags (-msse3, -mavx, -mavx512*, -mgfni, ...) passed
      when targeting a non-x86 architecture no longer cause x86 CPP
      macros (__SSE3__, __AVX512BW__, __GFNI__, ...) to be defined, nor
      x86 attributes to be passed to LLVM.
    - Error messages reported when required CPU features are not enabled
      now print out the minimal set of flags required
      (e.g. "-mavx512vl" rather than "-mavx512f -mavx512vl").
  

• 9af64305
  by Luite Stegeman at 2026-11-03T07:01:23-05:00

  rts: move stack check to the start of the stg_unpack_cstring thunks
  
  fixes a deadlock
  
  see #27272
  

• a2208b21
  by Simon Jakobi at 2026-11-03T07:02:05-05:00

  Cmm: exclude the entry block from common block elimination
  
  a1d8139054c had fixed #27722 only partially, because it didn't prevent
  elimination of the entry block in later rounds, where the entry block is
  no longer guaranteed to come first.
  
  To close this loophole, we exclude the entry block from the CBE merge
  logic. See Note [Retain entry block during common block elimination] for
  details.
  
  This also deletes a misleading comment regarding unreachable blocks: the
  control-flow optimiser doesn't actually guarantee that no unreachable
  blocks reach CBE.
  
  Fixes #27722.
  
  Assisted-by: Claude Fable 5.1
  

• 37ad4710
  by Alan Zimmerman at 2026-11-03T07:02:46-05:00

  EPA: Use AnnList for GADT declarations
  
  Continuing the process of using AnnList to capture parser layout
  

• 5df7fd78
  by mangoiv at 2026-11-04T13:54:51+01:00

  hadrian: allow building binary dist tar without compression
  
  Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
  

2144 changed files:

• .gitlab-ci.yml
• .gitlab/ci.sh
• .gitlab/hello.hs
• .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
• .gitmodules
• + changelog.d/21101
• + 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/27380
• + changelog.d/27532
• + changelog.d/27556
• + changelog.d/27624
• + changelog.d/27626
• + 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/T20363
• + changelog.d/T23785
• + changelog.d/T26423
• + changelog.d/T26532
• + changelog.d/T26543
• + changelog.d/T26716
• changelog.d/T27202
• + changelog.d/T27314.md
• + changelog.d/T27323
• + changelog.d/T27329
• + changelog.d/T27360
• + changelog.d/T27368-ppr-unreachable-cmm-blocks.md
• + changelog.d/T27374
• + changelog.d/T27412
• + changelog.d/T27440
• + changelog.d/T27455
• + changelog.d/T27456
• + changelog.d/T27545
• + changelog.d/T27557
• + changelog.d/T27583
• + changelog.d/T27586
• + changelog.d/T27589
• + changelog.d/T27629
• + changelog.d/T27639
• + 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/T27847
• + changelog.d/T27916
• + changelog.d/T27979
• + changelog.d/T27994
• + 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/caf-deadlock-27272
• + changelog.d/clc-341-strict-mutable-data-types
• + changelog.d/clc-421
• + changelog.d/clc-446
• + changelog.d/clc-447
• + changelog.d/downsweep-refactor
• + changelog.d/fix-cmm-atomic-load-store
• + changelog.d/fix-cmm-dump-labels
• + changelog.d/fix-compacting-gc-constr-27649
• + changelog.d/fix-control0-mask-trampoline
• + changelog.d/fix-cross-ghc-info-unit-id
• + changelog.d/fix-heap-census-large-arrays-19048
• + changelog.d/fix-make-install-j
• + changelog.d/fix-nonmoving-weak-evacuation-race-23160
• + changelog.d/fix-parallel-gc-selector-race-27477
• + changelog.d/fix-threadlabel-segfault-27618
• + changelog.d/fix-use-std-ap-thunk
• + changelog.d/ghc-api-interactive-ids
• + changelog.d/hadrian-persist-flavour
• + changelog.d/hadrian-uncompressed-tar
• + changelog.d/hpc-classinsts
• + changelog.d/hpc-cleanup
• + changelog.d/implicit-field-strictness-warning
• + changelog.d/lazy-field-annotations
• + changelog.d/link-deterministic-order
• + 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/refactor-known-names
• + changelog.d/resizeMutableByteArray-pinnedness
• + changelog.d/rethrow-stm
• + changelog.d/select-io-manager
• changelog.d/semaphore-v2
• + changelog.d/show-byte-code
• changelog.d/tcplugin_init.md
• + changelog.d/unboxed-do
• + changelog.d/unit-index
• + changelog.d/warn-defaulted-callstack
• + changelog.d/zap-coercions
• compiler/GHC.hs
• + compiler/GHC/Builtin.hs
• + compiler/GHC/Builtin/KnownKeys.hs
• + compiler/GHC/Builtin/KnownOccs.hs
• + compiler/GHC/Builtin/Modules.hs
• − compiler/GHC/Builtin/Names.hs
• − compiler/GHC/Builtin/Names/TH.hs
• compiler/GHC/Builtin/PrimOps.hs
• compiler/GHC/Builtin/PrimOps/Casts.hs
• compiler/GHC/Builtin/PrimOps/Ids.hs
• + compiler/GHC/Builtin/TH.hs
• compiler/GHC/Builtin/Uniques.hs
• compiler/GHC/Builtin/Uniques.hs-boot
• − compiler/GHC/Builtin/Utils.hs
• + compiler/GHC/Builtin/WiredIn/Ids.hs
• compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs
• compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs
• compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs
• compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot
• + compiler/GHC/Builtin/WiredIn/Types/Box.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Serialize.hs
• + compiler/GHC/ByteCode/Show.hs
• compiler/GHC/Cmm.hs
• compiler/GHC/Cmm/CallConv.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/Pipeline.hs
• 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/Config.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/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/CmmToLlvm/Config.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/Multiplicity.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/CallerCC.hs
• compiler/GHC/Core/Opt/CallerCC/Types.hs
• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/CprAnal.hs
• compiler/GHC/Core/Opt/DmdAnal.hs
• compiler/GHC/Core/Opt/Exitify.hs
• compiler/GHC/Core/Opt/LiberateCase.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/OccurAnal.hs
• compiler/GHC/Core/Opt/Pipeline.hs
• compiler/GHC/Core/Opt/SetLevels.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/WorkWrap/Utils.hs
• compiler/GHC/Core/Ppr.hs
• compiler/GHC/Core/Predicate.hs
• compiler/GHC/Core/Reduction.hs
• compiler/GHC/Core/Rules.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/Unfold.hs
• 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/CmmToAsm.hs
• compiler/GHC/Driver/Config/CmmToLlvm.hs
• + compiler/GHC/Driver/Config/Concurrency.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Config/StgToCmm.hs
• compiler/GHC/Driver/Config/Tidy.hs
• compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env.hs
• compiler/GHC/Driver/Env/KnotVars.hs
• compiler/GHC/Driver/Env/Types.hs
• compiler/GHC/Driver/Errors/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/Hsc.hs
• compiler/GHC/Driver/Main/Interactive.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
• 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/Plugins.hs
• compiler/GHC/Driver/Session.hs
• compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs.hs
• compiler/GHC/Hs/Basic.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• compiler/GHC/Hs/Decls/Overlap.hs
• compiler/GHC/Hs/Doc.hs
• compiler/GHC/Hs/DocString.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/Specificity.hs
• compiler/GHC/Hs/Stats.hs
• compiler/GHC/Hs/Syn/Type.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Arrows.hs
• compiler/GHC/HsToCore/Binds.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Expr.hs
• compiler/GHC/HsToCore/Foreign/C.hs
• compiler/GHC/HsToCore/Foreign/Call.hs
• compiler/GHC/HsToCore/Foreign/JavaScript.hs
• compiler/GHC/HsToCore/Foreign/Utils.hs
• compiler/GHC/HsToCore/Foreign/Wasm.hs
• compiler/GHC/HsToCore/ListComp.hs
• compiler/GHC/HsToCore/Match.hs
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• compiler/GHC/HsToCore/Match/Constructor.hs
• compiler/GHC/HsToCore/Match/Literal.hs
• compiler/GHC/HsToCore/Monad.hs
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• compiler/GHC/HsToCore/Pmc/Check.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Ppr.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/Pmc/Types.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/HsToCore/Utils.hs
• compiler/GHC/Iface/Binary.hs
• compiler/GHC/Iface/Decl.hs
• compiler/GHC/Iface/Env.hs
• − compiler/GHC/Iface/Env.hs-boot
• compiler/GHC/Iface/Errors/Ppr.hs
• compiler/GHC/Iface/Errors/Types.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Debug.hs
• compiler/GHC/Iface/Ext/Types.hs
• compiler/GHC/Iface/Ext/Utils.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Make.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/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/Iface/Warnings.hs
• 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/Ppr.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/Platform.hs
• + compiler/GHC/Platform/CpuFeatures.hs
• compiler/GHC/Plugins.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.hs
• compiler/GHC/Rename/HsType.hs
• compiler/GHC/Rename/Lit.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Pat.hs
• compiler/GHC/Rename/Splice.hs
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/Rename/Utils.hs
• compiler/GHC/Runtime/Context.hs
• compiler/GHC/Runtime/Debugger.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Interpreter/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/Stg/Unarise.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/Config.hs
• compiler/GHC/StgToCmm/DataCon.hs
• compiler/GHC/StgToCmm/Env.hs
• compiler/GHC/StgToCmm/Foreign.hs
• compiler/GHC/StgToCmm/Lit.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/Ticky.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/Arg.hs
• compiler/GHC/StgToJS/CodeGen.hs
• compiler/GHC/StgToJS/Expr.hs
• compiler/GHC/StgToJS/ExprCtx.hs
• compiler/GHC/StgToJS/FFI.hs
• compiler/GHC/StgToJS/Linker/Linker.hs
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• compiler/GHC/Tc/Types/ErrCtxt.hs
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• compiler/GHC/Tc/Types/LclEnv.hs
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• compiler/GHC/Types/Annotations.hs
• compiler/GHC/Types/Arity.hs
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• compiler/GHC/Types/Error/Codes.hs
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• compiler/GHC/Types/Fixity.hs
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• compiler/GHC/Types/Unique/Map.hs
• compiler/GHC/Types/Unique/Set.hs
• compiler/GHC/Types/Unique/Supply.hs
• + compiler/GHC/Types/UnresolvedImport.hs
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• compiler/GHC/Types/Var/Set.hs
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• compiler/GHC/Unit/External.hs
• + compiler/GHC/Unit/External/Database.hs
• + compiler/GHC/Unit/External/Index.hs
• + compiler/GHC/Unit/External/ModuleOrigin.hs
• + compiler/GHC/Unit/External/Providers.hs
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• + compiler/GHC/Unit/External/Substitution.hs
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• compiler/GHC/Unit/Finder.hs
• + compiler/GHC/Unit/Finder/Cache.hs
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• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/ModSummary.hs
• + compiler/GHC/Unit/Module/Name.hs
• compiler/GHC/Unit/Module/Warnings.hs
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• compiler/GHC/Unit/Types.hs-boot
• compiler/GHC/Utils/Binary.hs
• − compiler/GHC/Utils/Binary/Typeable.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/Basic.hs
• compiler/Language/Haskell/Syntax/Binds.hs
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• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Lit.hs
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• compiler/Language/Haskell/Syntax/Text.hs
• compiler/Language/Haskell/Syntax/Type.hs
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• docs/index.html.in
• docs/users_guide/debugging.rst
• docs/users_guide/eventlog-formats.rst
• docs/users_guide/expected-undocumented-flags.txt
• docs/users_guide/extending_ghc.rst
• docs/users_guide/exts/gadt_syntax.rst
• docs/users_guide/exts/literals.rst
• docs/users_guide/exts/qualified_do.rst
• docs/users_guide/exts/qualified_strings.rst
• docs/users_guide/exts/rank_polymorphism.rst
• docs/users_guide/exts/static_pointers.rst
• docs/users_guide/exts/strict.rst
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• docs/users_guide/exts/type_families.rst
• docs/users_guide/ghc_config.py.in
• docs/users_guide/runtime_control.rst
• docs/users_guide/separate_compilation.rst
• docs/users_guide/using-warnings.rst
• docs/users_guide/using.rst
• ghc/GHC/Driver/Session/Mode.hs
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Info.hs
• ghc/GHCi/UI/Monad.hs
• ghc/Main.hs
• ghc/ghc-bin.cabal.in
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• hadrian/bindist/Makefile
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• hadrian/cabal.project
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• hadrian/ghci-multi-cabal.in
• hadrian/hadrian.cabal
• − hadrian/hie-bios
• hadrian/hie-bios.bat
• hadrian/src/Base.hs
• hadrian/src/Builder.hs
• hadrian/src/CommandLine.hs
• hadrian/src/Flavour.hs
• hadrian/src/Hadrian/Builder.hs
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• hadrian/src/Main.hs
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• hadrian/src/Oracles/Setting.hs
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• hadrian/src/Rules.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
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• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Ar.hs
• − hadrian/src/Settings/Flavours/Quickest.hs
• hadrian/src/Settings/Packages.hs
• hadrian/src/Settings/Warnings.hs
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• + libraries/base/src/Control/Concurrent/Chan/Strict.hs
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• + libraries/base/src/Data/IORef/Strict.hs
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• + libraries/base/src/Data/RealFloat.hs
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• libraries/base/src/GHC/Base.hs
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• libraries/base/src/GHC/Conc.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
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• libraries/ghc-internal/src/GHC/Internal/Foreign/C/String/Encoding.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/C/Types.hs
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• libraries/ghc-internal/src/GHC/Internal/Foreign/Marshal/Alloc.hs
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• libraries/ghc-internal/src/GHC/Internal/Foreign/Ptr.hs
• libraries/ghc-internal/src/GHC/Internal/Foreign/Storable.hs
• libraries/ghc-internal/src/GHC/Internal/ForeignPtr.hs
• libraries/ghc-internal/src/GHC/Internal/ForeignSrcLang.hs
• libraries/ghc-internal/src/GHC/Internal/Functor/ZipList.hs
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• rts/IOManagerInternals.h
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• rts/LdvProfile.c
• rts/ZeroSlop.c → rts/MarkSlop.c
• rts/Messages.c
• rts/Prelude.h
• rts/PrimOps.cmm
• rts/Printer.c
• rts/ProfHeap.c
• rts/Profiling.c
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• rts/sm/Sweep.c
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• rts/win32/ConsoleHandler.h
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• testsuite/tests/warnings/should_compile/DerivingTypeable.stderr
• testsuite/tests/warnings/should_compile/Overflow.stderr-ws-32
• testsuite/tests/warnings/should_compile/Overflow.stderr-ws-64
• + testsuite/tests/warnings/should_compile/RedundantCanonicalMethods.hs
• + testsuite/tests/warnings/should_compile/RedundantCanonicalMethods.stderr
• testsuite/tests/warnings/should_compile/T13256.stderr-ws-32
• testsuite/tests/warnings/should_compile/T13256.stderr-ws-64
• + 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/genprimopcode/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
• utils/haddock/CHANGES.md
• utils/haddock/haddock-api/haddock-api.cabal
• utils/haddock/haddock-api/src/Haddock.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/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/AttachInstances.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Create.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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