Andreas Klebinger pushed to branch wip/andreask/fix-notes at Glasgow Haskell Compiler / GHC

Commits:

• 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
  

• c06b075b
  by Andreas Klebinger at 2026-08-17T14:03:44+02:00

  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.
  

1237 changed files:

• .gitlab-ci.yml
• .gitlab/ci.sh
• + changelog.d/21101
• + changelog.d/27380
• + changelog.d/27532
• + changelog.d/27626
• + changelog.d/T20363
• + changelog.d/T26423
• + changelog.d/T26532
• + changelog.d/T26716
• + changelog.d/T27314.md
• + changelog.d/T27368-ppr-unreachable-cmm-blocks.md
• + changelog.d/T27374
• + changelog.d/T27440
• + changelog.d/T27455
• + changelog.d/T27557
• + changelog.d/T27583
• + changelog.d/T27586
• + changelog.d/T27589
• + changelog.d/T27639
• + changelog.d/downsweep-refactor
• + changelog.d/fix-cmm-dump-labels
• + changelog.d/fix-heap-census-large-arrays-19048
• + changelog.d/lazy-field-annotations
• + changelog.d/link-deterministic-order
• + changelog.d/refactor-known-names
• + changelog.d/show-byte-code
• + changelog.d/unit-index
• + changelog.d/warn-defaulted-callstack
• 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/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Serialize.hs
• + compiler/GHC/ByteCode/Show.hs
• compiler/GHC/Cmm.hs
• compiler/GHC/Cmm/Pipeline.hs
• compiler/GHC/CmmToAsm/Format.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Class.hs
• compiler/GHC/Core/Coercion.hs
• compiler/GHC/Core/Coercion/Axiom.hs
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/DataCon.hs
• compiler/GHC/Core/FVs.hs
• compiler/GHC/Core/FamInstEnv.hs
• compiler/GHC/Core/Lint.hs
• compiler/GHC/Core/Make.hs
• compiler/GHC/Core/Multiplicity.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/CprAnal.hs
• compiler/GHC/Core/Opt/DmdAnal.hs
• compiler/GHC/Core/Opt/LiberateCase.hs
• compiler/GHC/Core/Opt/OccurAnal.hs
• compiler/GHC/Core/Opt/SetLevels.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/WorkWrap/Utils.hs
• compiler/GHC/Core/Ppr.hs
• compiler/GHC/Core/Predicate.hs
• compiler/GHC/Core/Rules.hs
• compiler/GHC/Core/SimpleOpt.hs
• compiler/GHC/Core/Subst.hs
• compiler/GHC/Core/TyCo/FVs.hs
• compiler/GHC/Core/TyCo/Rep.hs
• compiler/GHC/Core/TyCon.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Unfold.hs
• compiler/GHC/Core/Unify.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToIface.hs
• compiler/GHC/CoreToStg.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/Unboxed.hs
• compiler/GHC/Data/Word64Map/Internal.hs
• compiler/GHC/Data/Word64Map/Lazy.hs
• compiler/GHC/Data/Word64Map/Strict.hs
• compiler/GHC/Data/Word64Map/Strict/Internal.hs
• compiler/GHC/Driver/Backpack.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/Flags.hs
• compiler/GHC/Driver/GenerateCgIPEStub.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/MakeFile.hs
• compiler/GHC/Driver/Pipeline.hs
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Plugins.hs
• compiler/GHC/Driver/Session.hs
• compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs/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/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
• compiler/GHC/HsToCore/Match.hs-boot
• compiler/GHC/HsToCore/Match/Constructor.hs
• compiler/GHC/HsToCore/Match/Literal.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc/Check.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Pmc/Ppr.hs
• compiler/GHC/HsToCore/Pmc/Solver.hs
• compiler/GHC/HsToCore/Pmc/Solver/Types.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/HsToCore/Utils.hs
• compiler/GHC/Iface/Binary.hs
• compiler/GHC/Iface/Env.hs
• − compiler/GHC/Iface/Env.hs-boot
• compiler/GHC/Iface/Errors/Ppr.hs
• compiler/GHC/Iface/Errors/Types.hs
• compiler/GHC/Iface/Ext/Ast.hs
• compiler/GHC/Iface/Ext/Types.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Make.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/Syntax.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Tidy/StaticPtrTable.hs
• compiler/GHC/Iface/Type.hs
• compiler/GHC/Iface/Warnings.hs
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/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/PostProcess.hs
• compiler/GHC/Parser/PostProcess/Haddock.hs
• compiler/GHC/Plugins.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/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Loader.hs
• compiler/GHC/Stg/BcPrep.hs
• compiler/GHC/Stg/Lint.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm/Bind.hs
• compiler/GHC/StgToCmm/DataCon.hs
• compiler/GHC/StgToCmm/Env.hs
• compiler/GHC/StgToCmm/Foreign.hs
• compiler/GHC/StgToCmm/Lit.hs
• compiler/GHC/StgToCmm/Ticky.hs
• compiler/GHC/StgToJS/Apply.hs
• compiler/GHC/StgToJS/Arg.hs
• compiler/GHC/StgToJS/Expr.hs
• compiler/GHC/StgToJS/FFI.hs
• compiler/GHC/StgToJS/Linker/Utils.hs
• compiler/GHC/StgToJS/Utils.hs
• compiler/GHC/Tc/Deriv.hs
• compiler/GHC/Tc/Deriv/Functor.hs
• compiler/GHC/Tc/Deriv/Generate.hs
• compiler/GHC/Tc/Deriv/Generics.hs
• compiler/GHC/Tc/Deriv/Infer.hs
• compiler/GHC/Tc/Deriv/Utils.hs
• compiler/GHC/Tc/Errors.hs
• compiler/GHC/Tc/Errors/Hole.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Arrow.hs
• compiler/GHC/Tc/Gen/Bind.hs
• compiler/GHC/Tc/Gen/Default.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Expr.hs
• compiler/GHC/Tc/Gen/Foreign.hs
• compiler/GHC/Tc/Gen/Head.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Match.hs
• compiler/GHC/Tc/Gen/Pat.hs
• compiler/GHC/Tc/Gen/Sig.hs
• compiler/GHC/Tc/Gen/Splice.hs
• compiler/GHC/Tc/Instance/Class.hs
• compiler/GHC/Tc/Instance/FunDeps.hs
• compiler/GHC/Tc/Instance/Typeable.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Plugin.hs
• compiler/GHC/Tc/Solver.hs
• compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Dict.hs
• compiler/GHC/Tc/Solver/FunDeps.hs
• compiler/GHC/Tc/Solver/InertSet.hs
• compiler/GHC/Tc/Solver/Monad.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/Class.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/Constraint.hs
• compiler/GHC/Tc/Types/Evidence.hs
• compiler/GHC/Tc/Types/LclEnv.hs
• compiler/GHC/Tc/Types/Origin.hs
• compiler/GHC/Tc/Utils/Backpack.hs
• compiler/GHC/Tc/Utils/Concrete.hs
• compiler/GHC/Tc/Utils/Env.hs
• compiler/GHC/Tc/Utils/Instantiate.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Arity.hs
• compiler/GHC/Types/Basic.hs
• compiler/GHC/Types/DefaultEnv.hs
• compiler/GHC/Types/Demand.hs
• compiler/GHC/Types/Error/Codes.hs
• compiler/GHC/Types/FieldLabel.hs
• compiler/GHC/Types/Fixity.hs
• compiler/GHC/Types/ForeignCall.hs
• compiler/GHC/Types/GREInfo.hs
• compiler/GHC/Types/Hint.hs
• compiler/GHC/Types/Hint/Ppr.hs
• compiler/GHC/Types/Id/Make.hs
• compiler/GHC/Types/InlinePragma.hs
• compiler/GHC/Types/Literal.hs
• compiler/GHC/Types/Name.hs
• compiler/GHC/Types/Name/Cache.hs
• compiler/GHC/Types/Name/Ppr.hs
• compiler/GHC/Types/Name/Reader.hs
• compiler/GHC/Types/RepType.hs
• compiler/GHC/Types/TyThing.hs
• compiler/GHC/Types/Unique.hs
• compiler/GHC/Types/Unique/DFM.hs
• compiler/GHC/Types/Unique/FM.hs
• + compiler/GHC/Types/UnresolvedImport.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Unit.hs
• compiler/GHC/Unit/Env.hs
• compiler/GHC/Unit/External.hs
• + compiler/GHC/Unit/External/Database.hs
• + compiler/GHC/Unit/External/Index.hs
• + compiler/GHC/Unit/External/ModuleOrigin.hs
• + compiler/GHC/Unit/External/Providers.hs
• + compiler/GHC/Unit/External/Query.hs
• + compiler/GHC/Unit/External/Substitution.hs
• + compiler/GHC/Unit/External/Validate.hs
• + compiler/GHC/Unit/External/Visibility.hs
• + compiler/GHC/Unit/External/Wired.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Finder/Types.hs
• compiler/GHC/Unit/Home/Graph.hs
• compiler/GHC/Unit/Info.hs
• compiler/GHC/Unit/Module/Deps.hs
• compiler/GHC/Unit/Module/ModSummary.hs
• compiler/GHC/Unit/Module/Warnings.hs
• compiler/GHC/Unit/State.hs
• compiler/GHC/Unit/State.hs-boot
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Utils/Binary.hs
• − compiler/GHC/Utils/Binary/Typeable.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/Language/Haskell/Syntax/Basic.hs
• compiler/Language/Haskell/Syntax/Binds.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• compiler/Language/Haskell/Syntax/Decls/Foreign.hs
• compiler/Language/Haskell/Syntax/Doc.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/ImpExp.hs
• compiler/Language/Haskell/Syntax/Specificity.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/exts/qualified_strings.rst
• docs/users_guide/exts/strict.rst
• docs/users_guide/ghc_config.py.in
• 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/Monad.hs
• ghc/Main.hs
• hadrian/cfg/system.config.host.in
• hadrian/cfg/system.config.target.in
• − hadrian/hie-bios
• hadrian/hie-bios.bat
• hadrian/src/Hadrian/Builder/Ar.hs
• hadrian/src/Hadrian/Utilities.hs
• hadrian/src/Oracles/Flag.hs
• hadrian/src/Rules/BinaryDist.hs
• hadrian/src/Rules/CabalReinstall.hs
• hadrian/src/Rules/Documentation.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Library.hs
• hadrian/src/Rules/Nofib.hs
• hadrian/src/Rules/Program.hs
• hadrian/src/Rules/Register.hs
• hadrian/src/Rules/Rts.hs
• hadrian/src/Rules/SourceDist.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings/Packages.hs
• hie.yaml
• libraries/base/base.cabal.in
• libraries/base/changelog.md
• libraries/base/src/Control/Applicative.hs
• libraries/base/src/Control/Concurrent.hs
• libraries/base/src/Control/Concurrent/Chan.hs
• libraries/base/src/Control/Concurrent/QSem.hs
• libraries/base/src/Control/Concurrent/QSemN.hs
• libraries/base/src/Data/Array/Byte.hs
• libraries/base/src/Data/Bifoldable.hs
• libraries/base/src/Data/Bifoldable1.hs
• libraries/base/src/Data/Bifunctor.hs
• libraries/base/src/Data/Bitraversable.hs
• libraries/base/src/Data/Bool.hs
• libraries/base/src/Data/Complex.hs
• libraries/base/src/Data/Data.hs
• libraries/base/src/Data/Enum.hs
• libraries/base/src/Data/Fixed.hs
• libraries/base/src/Data/Foldable1.hs
• libraries/base/src/Data/Functor/Classes.hs
• libraries/base/src/Data/Functor/Compose.hs
• libraries/base/src/Data/Functor/Contravariant.hs
• libraries/base/src/Data/Functor/Product.hs
• libraries/base/src/Data/Functor/Sum.hs
• libraries/base/src/Data/List.hs
• libraries/base/src/Data/List/NonEmpty.hs
• libraries/base/src/Data/List/NubOrdSet.hs
• libraries/base/src/Data/Semigroup.hs
• libraries/base/src/Data/Version.hs
• libraries/base/src/GHC/Base.hs
• libraries/base/src/GHC/ByteOrder.hs
• + libraries/base/src/GHC/Essentials.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/Fingerprint.hs
• libraries/base/src/GHC/RTS/Flags.hs
• libraries/base/src/GHC/ResponseFile.hs
• libraries/base/src/GHC/Stack.hs
• libraries/base/src/GHC/Stats.hs
• libraries/base/src/GHC/Weak/Finalize.hs
• libraries/base/src/Numeric.hs
• libraries/base/src/Prelude.hs
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• libraries/base/src/System/CPUTime/Posix/Times.hsc
• libraries/base/src/System/CPUTime/Unsupported.hs
• libraries/base/src/System/Console/GetOpt.hs
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• libraries/base/src/System/IO/OS.hs
• libraries/base/src/System/IO/Unsafe.hs
• libraries/base/src/System/Info.hs
• libraries/base/src/System/Timeout.hs
• libraries/base/src/Text/Printf.hs
• libraries/base/src/Text/Read.hs
• libraries/base/src/Text/Show/Functions.hs
• libraries/base/tests/all.T
• libraries/base/tests/listThreads1.hs
• libraries/base/tests/listThreads1.stdout
• libraries/base/tests/perf/ElemFusionUnknownList_O1.stderr
• libraries/base/tests/perf/ElemFusionUnknownList_O2.stderr
• libraries/binary
• libraries/ghc-experimental/src/Data/Sum/Experimental.hs
• libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
• libraries/ghc-experimental/src/GHC/Profiling/Eras.hs
• libraries/ghc-experimental/src/Prelude/Experimental.hs
• libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
• libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
• libraries/ghc-internal/codepages/MakeTable.hs
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/include/RtsIfaceSymbols.h
• libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
• libraries/ghc-internal/src/GHC/Internal/Arr.hs
• libraries/ghc-internal/src/GHC/Internal/ArrayArray.hs
• libraries/ghc-internal/src/GHC/Internal/Base.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs
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• libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
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• libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs-boot
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• libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs-boot
• libraries/ghc-internal/src/GHC/Internal/Bignum/Primitives.hs
• libraries/ghc-internal/src/GHC/Internal/Bignum/WordArray.hs
• libraries/ghc-internal/src/GHC/Internal/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
• libraries/ghc-internal/src/GHC/Internal/CString.hs
• libraries/ghc-internal/src/GHC/Internal/Char.hs
• libraries/ghc-internal/src/GHC/Internal/Classes.hs
• libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
• libraries/ghc-internal/src/GHC/Internal/Clock.hsc
• libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/POSIX/Const.hsc
• libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
• libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
• libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
• libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Category.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Concurrent/MVar.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
• libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Bits.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Coerce.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Dynamic.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Either.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
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• libraries/ghc-internal/src/GHC/Internal/Data/Functor.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Functor/Utils.hs
• libraries/ghc-internal/src/GHC/Internal/Data/IORef.hs
• libraries/ghc-internal/src/GHC/Internal/Data/List.hs
• libraries/ghc-internal/src/GHC/Internal/Data/List/NonEmpty.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
• libraries/ghc-internal/src/GHC/Internal/Data/NonEmpty.hs
• libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Ord.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
• libraries/ghc-internal/src/GHC/Internal/Data/STRef.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Semigroup/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Data/String.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Traversable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Tuple.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Bool.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Coercion.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Equality.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Type/Ord.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Typeable.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Typeable/Internal.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Unique.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Version.hs
• libraries/ghc-internal/src/GHC/Internal/Data/Void.hs
• libraries/ghc-internal/src/GHC/Internal/Debug/Trace.hs
• libraries/ghc-internal/src/GHC/Internal/Desugar.hs
• libraries/ghc-internal/src/GHC/Internal/Encoding/UTF8.hs
• libraries/ghc-internal/src/GHC/Internal/Enum.hs
• libraries/ghc-internal/src/GHC/Internal/Enum.hs-boot
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• libraries/ghc-internal/src/GHC/Internal/Err.hs
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• + testsuite/tests/pmcheck/should_compile/T27314.hs
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• utils/check-exact/ExactPrint.hs
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• utils/deriveConstants/Main.hs
• utils/genprimopcode/Main.hs
• utils/haddock/haddock-api/src/Haddock.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.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/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs

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