Jaro Reinders pushed to branch wip/reduce-type-in-stg at Glasgow Haskell Compiler / GHC

Commits:

• 04d143c0
  by Luite Stegeman at 2026-04-21T14:05:33-04:00

  rts: add a few missing i386 relocations in the rts linker
  

• 014087e7
  by Luite Stegeman at 2026-04-21T14:05:34-04:00

  CodeOutput: Fix finalizers on multiple platforms
  
   - ELF platforms: emit .fini_array section
   - wasm32/Darwin: emit initializer with __cxa_atexit call
   - Windows: use -Wl,--whole-archive to prevent dropping finalizer symbols
   - rts linker: fix crash/assertion failure unloading objects with finalizers
  
  fixes #27072
  

• 915bba6f
  by Simon Jakobi at 2026-04-21T14:06:16-04:00

  Add regression test for #10531
  
  Closes #10531.
  

• 86a646a6
  by Andreas Klebinger at 2026-04-22T13:00:05-04:00

  Revert use of generic instances for compiler time perf reasons.
  
  Revert "Derive Semigroup/Monoid for instances believed could be derived in #25871"
  
  This reverts commit 11a04cbb221cc404fe00d65d7c951558ede4caa9.
  
  Revert "add Ghc.Data.Pair deriving"
  
  This reverts commit 15d9ce449e1be8c01b89fd39bdf1e700ea7d1dce.
  

• bc9ee1cf
  by Wen Kokke at 2026-04-22T13:00:51-04:00

  hadrian: Fix docs to remove static flavour
  
  In 638f6548, the static flavour was turned into into the fully_static
  flavour transformer. However, this commit did not update flavours.md.
  

• cc9cc6d5
  by Cheng Shao at 2026-04-23T09:40:46+00:00

  configure: bump LlvmMaxVersion to 23
  
  This patch bumps `LlvmMaxVersion` to 23 to support LLVM 22.x releases.
  

• 2ea7ef8e
  by Cheng Shao at 2026-04-23T09:46:26+00:00

  changelog: add llvm 22.x support
  

• 5574ee10
  by Cheng Shao at 2026-04-24T08:24:30-04:00

  compiler: avoid unused temporary `appendFS` operands
  
  This patch fixes unused temporary `appendFS` operands in the codebase
  that are retained in the `FastString` table after concatenation.
  Rewrite rules are added so that if an operand is
  `fsLit`/`mkFastString`, the `appendFS` application is rewritten to
  append the `ShortByteString` operands first. The patch also fixes
  `sconcat` behavior to align with `mconcat` for the same reason. Fixes #27205.
  

• 4ed78760
  by mangoiv at 2026-04-24T08:25:13-04:00

  contributing: adjust MR template to be less verbose
  
  - MR template only shows text that is relevant for submissiong
  - MR template was rewritten so it's readable from a user's and reviewer's
    perspective
  
  Resolves #27165
  
  Co-Authored-By: @sheaf
  

• 87db83e2
  by Cheng Shao at 2026-04-24T14:37:21-04:00

  ci: bump freebsd boot ghc to 9.10.3
  
  This commit bumps freebsd boot ghc to 9.10.3 to align with other
  platforms and prevent outdated boot libs in boot ghc to block the
  freebsd job.
  

• 17e3a0b7
  by Cheng Shao at 2026-04-24T14:37:21-04:00

  compiler: improve Binary instance of Array
  
  This patch improves the `Binary` instance of `Array`:
  
  - We no longer allocate intermediate lists. When serializing an
    `Array`, we iterate over the elements directly; when deserializing
    it, we allocate the result `Array` and fill it in a loop.
  - Now we only serialize the array bounds tuple; the length field is
    not needed.
  
  Closes #27109.
  

• 2d30f7d3
  by sheaf at 2026-04-24T14:38:23-04:00

  Vendor mini-QuickCheck for testsuite
  
  This commit extracts the vendored QuickCheck implementation from the
  foundation testsuite to make it more broadly available in the GHC
  testsuite, and makes use of it in the simd006 test (which also used
  a vendored QuickCheck implementation).
  
  On the way, we update the linear congruential generator to avoid the
  shortcoming of only generating 31 bit large numbers.
  
  Fixes #25990 and #25969.
  

• 1350271b
  by sheaf at 2026-04-27T09:32:53-04:00

  Ensure TcM plugins are only initialised once
  
  This commit ensures we keep TcM plugins (typechecker plugins,
  defaulting plugins and hole fit plugins) running all the way through
  desugaring, instead of stopping them at the end of typechecking.
  
  To do this, the "stop" actions of TcPlugin and DefaultingPlugin are
  split into two: one for the "post-typecheck" action, and one for the
  final shutdown action (after desugaring).
  
  This allows the plugins to be invoked by the pattern match checker
  (during desugaring) without having to be repeatedly re-initialised and
  stopped, fixing #26839.
  
  In the process, this commit modifies 'initTc' and 'initTcInteractive',
  adding an extra argument that describes whether to start/stop the 'TcM'
  plugins.
  
  See Note [Stop TcM plugins after desugaring] for an overview.
  

• 42549222
  by sheaf at 2026-04-27T09:33:50-04:00

  Hadrian: add --keep-response-files
  
  This commit adds a Hadrian flag that allows response files to be
  retained. This is useful for debugging a failing Hadrian command line.
  

• 40564e8d
  by sheaf at 2026-04-27T09:34:46-04:00

  hadrian/build-cabal.bat: fix build on Windows
  
  Commit 8cb99552f6 introduced a warning for a missing package index.
  However, the logic was faulty on Windows: the piping was broken, and
  "remote-repo-cache:" was being interpreted as a (malformed) drive letter,
  leading to the error:
  
    The filename, directory name, or volume label syntax is incorrect.
  
  This commit fixes that by using a temporary file instead of piping.
  

• 14bc71e4
  by Sven Tennie at 2026-04-28T13:22:47-04:00

  ghc: Distinguish between having an interpreter and having an internal one
  
  Actually, these are related but different things:
  
  - ghc can run an interpreter (either internal or external)
  - ghc is compiled with an internal interpreter
  
  Splitting the logic solves compiler warnings and expresses the intent
  better.
  

• df691563
  by Vladislav Zavialov at 2026-04-28T13:23:29-04:00

  Refactor HsWildCardTy to use HoleKind (#27111)
  
  The payload of this patch is that the extension fields of HsWildCardTy
  and HsHole now match:
  
  	type instance XWildCardTy Ghc{Ps,Rn} = HoleKind
  	type instance XHole       Ghc{Ps,Rn} = HoleKind
  
  This is progress towards unification of HsExpr and HsType.
  Test case: T25121_status
  
  In addition to that, exact-printing of infix holes is fixed.
  Test case: PprInfixHole
  

• f3485446
  by fendor at 2026-04-28T13:24:12-04:00

  Expose startupHpc as an rts symbol
  

• 28f07d70
  by fendor at 2026-04-28T13:24:12-04:00

  Make HPC work with bytecode interpreter
  
  Add support to generate .tix files from bytecode objects and the
  bytecode interpreter.
  
  Conceptually, we insert HPC ticks into the bytecode similar to how we insert
  breakpoints.
  HPC and breakpoints do not share the same tick array but we use a separate
  tick-array for hpc/breakpoint ticks during bytecode generation.
  
  We teach the bytecode interpreter to handle hpc ticks.
  The implementation is quite trivial, simply increment the counter in the
  global hpc_ticks array for the respective module.
  
  This hpc_ticks array is generated as part of the `CStub`, so we can rely
  on it existing.
  
  A tricky bit is "registering" a bytecode object for HPC instrumentation.
  In the compiled case, this is achieved via CStub and initializer/finalizers
  `.init` sections which are called when the executable is run.
  After the initializers have been invoked, which is before `hs_init_ghc`,
  we then call `startup_hpc` in `hs_init_ghc` iff any modules were "registered"
  for hpc instrumentation via `hs_hpc_module`.
  
  Since bytecode objects are loaded after starting up GHCi, this workflow
  doesn't work for supporting `hpc` and the `hpc` run-time is never
  started, even if a module is added for instrumentation.
  
  We fix this issue by employing the same technique as is for `SptEntry`s:
  
  * We introduce a new field to `CompiledByteCode`, called `ByteCodeHpcInfo`
    which contains enough information to call `hs_hpc_module`, allowing us to
    register the module for `hpc` instrumentation`.
  * After registering the module, we unconditionally call `startupHpc`, to make
    sure the .tix file is written.
  
  Calling `startupHpc` multiple times is safe.
  Calling `hs_hpc_module` multiple times for the same module is also safe.
  
  If we didn't register the hpc module in this way, evaluating a bytecode object
  instrumented with `-fhpc` without registering it in the `hpc` run-time will
  simply not generate any `.tix` files for this bytecode object.
  
  However, this shouldn't happen if everything is set up correctly.
  
  Closes #27036
  

• 950879f0
  by Vladislav Zavialov at 2026-04-28T13:24:55-04:00

  Move NamespaceSpecifier from x-fields into the AST proper (#26678)
  
  This refactoring moves NamespaceSpecifier out of extension fields and into the
  AST proper, as it is part of the user-written source, and is not pass-specific.
  
  Summary of changes:
  
  * Move NamespaceSpecifier from GHC/Hs/Basic.hs to Language/Haskell/Syntax/ImpExp.hs
    and parameterise it by the compiler pass, creating the necessary extension points
  * Move NamespaceSpecifier out of XFixitySig into FixitySig
  * Move NamespaceSpecifier out of XIEThingAll (IEThingAllExt) into IEThingAll
  * Move NamespaceSpecifier out of XIEWholeNamespace (IEWholeNamespaceExt) into IEWholeNamespace
  
  This is a pure refactoring with no change in behaviour.
  

• 9797052b
  by Simon Peyton Jones at 2026-04-28T13:25:37-04:00

  Fix assertion check in checkResultTy
  
  As #27210 shows, the assertion was a little bit too eager.
  
  I refactored a bit by moving some code from GHC.Tc.Gen.App
  to GHC.Tc.Utils.Unify; see the new function tcSubTypeApp,
  which replaces tcSubTypeDS
  

• 9f85f034
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Make cmm 'import "package" name;' syntax use consistent label types
  
  There is a little-used syntactic form in cmm imports:
  
  import "package" foo;
  
  Which means to import foo from the given package (unit id, specified as
  a string). This syntax is somewhat reminiscent of GHC's package import
  extension.
  
  This syntax form is not used in the rts cmm code, nor any of the boot
  libraries. It may not be used at all. Unclear.
  
  Change the kind of CLabel this syntax generates to be consistent with
  the others. The other cmm imports use ForeignLabel with
  ForeignLabelInExternalPackage. For some reason this form was using
  CmmLabel. Change that to also be ForeignLabel but with
  ForeignLabelInPackage. This specifies a specific package, rather
  than an unnamed external package.
  

• a811f68f
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Change default cmm import statements to be internal
  
  Previously a cmm statement like:
  
  import foo;
  
  meant to expect the symbol from a different shared library than the
  current one.
  
  Now it means to expect the symbol from the same shared library as the
  current one. We'll add explicit syntax to indicate that it's a foreign
  import. Most existing uses are in fact intenal (rts to rts), so few
  imports will need to be annotated foreign. Examples would include cmm
  code in libraries (other than the rts) that need to access RTS APIs.
  
  In practice, this makes no difference whatsoever at the moment on any
  platform other than windows (where building Haskell libs as shared libs
  does not fully work yet), since the 'labelDynamic' treats all such
  labels as foreign, irrespective of the foreign label source.
  

• 17fe5d1d
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add cmm import syntax 'import DATA foo;' as better name for CLOSURE
  
  The existing syntax is:
  
  import CLOSURE foo;
  
  The new syntax is
  
  import DATA foo;
  
  This means to interpret the symbol foo as refering to data (i.e. a
  global constant or variable) rather than to code (a function). The
  historical syntax for this uses CLOSURE, which is rather misleading.
  Presumably this was done to avoid introducing new reserved words.
  
  Be less squemish about new reserved words and add DATA and use that.
  Keep the existing CLOSURE syntax as an alias for compatibility.
  

• 3a530d68
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add cmm 'import extern name;' syntax
  
  Since the default for cmm imports is now for symbols within the same
  shared object, we need a way to indicate we want a symbol from an
  external shared object:
  
  import extern foo;      -- for a function
  import extern DATA foo; -- for data
  
  This adds a new reserved word 'extern'.
  
  We don't expect to have to use this much. Most cmm imports are
  intra-DSO.
  
  This makes no difference currently on ELF and MachO platforms, but does
  make a difference to the linking conventions on PE (Windows).
  
  In future it's plausible we could take make distinctions on ELF or
  MachO, so it's worth trying to get it right. Windows can be the guinea
  pig.
  

• 2b8e44c7
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add cmm syntax 'import "package" DATA foo;' for completeness
  
  We already have:
  
  import DATA foo;      -- for data imports
  import "package" foo; -- for imports from a given unitid
  
  There's no reason not to have both at once:
  
  import "package" DATA foo;
  
  So add that.
  

• ee05e5cc
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Improve the commentary for the cmm import grammar.
  
  AFAIK, this is the only place where GHC-style Cmm syntax is documented.
  

• b35946ad
  by Duncan Coutts at 2026-04-30T04:52:42-04:00

  Add a changelog.d entry for the .cmm import syntax changes
  

• d59b7c71
  by Wolfgang Jeltsch at 2026-04-30T04:53:25-04:00

  Move code that uses `GHC.Internal.Text.Read` into `base`
  
  This contribution serves to remove all dependencies on
  `GHC.Internal.Text.Read` from within `ghc-internal`, so that the
  implementation of `Text.Read` and ultimately more reading-related code
  can be moved to `base` as well.
  
  The following things are moved from `ghc-internal` to `base`:
  
    * I/O-related `Read` instances
    * Most of the `Numeric` implementation
    * The instance `Read ByteOrder`
    * The `parseVersion` operation
    * The `readConstr` operation
  
  Metric Increase:
      LinkableUsage01
      T9198
      T12425
      T13035
      T13820
      T18140
  

• 5bd6a964
  by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00

  New rts Message to {set,unset} TSO flags
  
  This commit introduces stg_MSG_SET_TSO_FLAG_info and
  stg_MSG_UNSET_TSO_FLAG_info, which allows setting flags of a TSO other
  than yourself.
  
  This is especially useful/necessary to set breakpoints and toggle
  breakpoints of different threads, which is needed to safely implement
  features like pausing, toggling step-out, toggling step-in per thread,
  etc.
  
  Fixes #27131
  
  -------------------------
  Metric Decrease:
      T3294
  -------------------------
  

• ce97fd3e
  by Rodrigo Mesquita at 2026-04-30T04:54:08-04:00

  test: Add test setting another TSO's flags
  
  Introduces a test that runs on two capabilities. The main thread running
  on Capability 0 sets the flags on a TSO running on Capability 1.
  The TSO from Capability 1 itself checks whether its flags were set and
  reports that back.
  
  This validates that the RTS messages for setting TSO flags work, even if
  it doesn't test a harsher scenario with race conditions to exercise why
  the message passing is necessary for safely setting another TSO's flags.
  
  Part of #27131
  

• a4ff6315
  by David Eichmann at 2026-04-30T04:54:51-04:00

  Hadrian: withResponseFile outputs response file when verbodity is Verbose
  
  At the Verbose verbosity, shake will display full commandlines. With the
  use of response files, the full command is hidden. That makes it hard to run
  the command manually. This commit outputs the contents of the response
  file so that that full command can be recreated and also hints at the
  use of the --keep-response-files hadrian flag.
  

• cd732ee3
  by Duncan Coutts at 2026-04-30T04:54:51-04:00

  Use response files for hadrian linking with ghc (support long command lines)
  
  In future support for windows dynamic linking, we expect long command
  lines for linking dll files with ghc. Experiments with dynamic linking the
  ghc-internal library yielded a link command well over 32kb. We did not
  encounter this before for static libs, since we already use ar's @file
  feature (if available, which it is for the llvm toolchain).
  
  Co-authored-by: David Eichmann <davide@well-typed.com>
  

• 3d41368f
  by Andreas Klebinger at 2026-04-30T04:55:32-04:00

  Split GHC.Driver.Main.hs up into multiple components.
  
  This commit splits GHC.Driver.Main into four components:
  
  * GHC.Driver.Main.Compile
  * GHC.Driver.Main.Hsc
  * GHC.Driver.Main.Interactive
  * GHC.Driver.Main.Passes
  
  We might improve that separation further in the future but this should
  hopefully make it easier to reason about and work with this part of the
  code.
  

• 2128ba85
  by Cheng Shao at 2026-04-30T04:56:14-04:00

  compiler: avoid unique OccNames for internal Names in bytecode objects
  
  This patch improves bytecode object serialization logic by avoiding
  the construction of unique `OccName`s when serializing/deserializing
  internal `Name`s. Closes #27213.
  
  -------------------------
  Metric Decrease:
      LinkableUsage01
  -------------------------
  

• e16854c3
  by Vladislav Zavialov at 2026-04-30T04:56:57-04:00

  Replace GHC 9.16 references with GHC 10.0
  

• 39141343
  by Alice Rixte at 2026-05-01T14:09:32+02:00

  Add Bounded instances for Double, Float, CDouble and CFloat
  

• 5c4c3bf4
  by Sylvain Henry at 2026-05-02T03:39:28-04:00

  testsuite: fix flaky foundation Divisible / mulIntMayOflo# tests (#27222)
  
  Since the LCG was widened to 64 bits and the seed randomised per CI run
  (commit 2d30f7d3400 "Vendor mini-QuickCheck for testsuite"), two latent
  bugs in the foundation test surface stochastically:
  
  * The Divisible property `(x `div` y) * y + (x `mod` y) == x` raises
    ArithException(Overflow) when (a, b) = (minBound, -1) for fixed-width
    signed Integral types. Split testNumber/testDivisible into Bounded and
    unbounded variants and skip just that one pair, gated by
    `(minBound :: a) < 0` so unsigned types lose no coverage.
  
  * The `mulIntMayOflo#` test compared raw Int# bit-for-bit, but the primop
    is only specified to return 0/non-zero -- the exact non-zero indicator
    legitimately differs between backends and inlining choices. Add a
    dedicated `testPrimopMayOflo` helper that only compares zero / non-zero.
  
  Also fix the long-standing typo "Dividible" -> "Divisible" in identifiers.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• e242ce4f
  by Sylvain Henry at 2026-05-02T03:39:28-04:00

  testsuite: catch and display exceptions in MiniQuickCheck
  
  Exceptions raised while evaluating a property are now caught and reported
  as a normal failure (with arguments and seed), instead of aborting the
  test.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 3b75cccd
  by fendor at 2026-05-02T03:40:14-04:00

  Fix name of Note [Structure of dep_boot_mods]
  

• 9a9ae4df
  by Duncan Coutts at 2026-05-05T14:44:37-04:00

  Use __attribute__((dllimport)) for external RTS symbol declarations
  
  This is needed to be hygenic about DLL symbol imports and exports.
  The attribute is ignored on platforms other than Windows.
  
  Use of the attribute however means that external data symbols do not
  have a compile-time constant address (they are loaded using an
  indirection). This means we have to adjust the rtsSyms initial linker
  table so that it is a local constant in a function, rather than a global
  constant. We now define it within a function that pre-populates the
  symbol table with the RTS symbols.
  

• 2ad3e01e
  by Duncan Coutts at 2026-05-05T14:44:37-04:00

  Fix the rts linker declarations for a few data symbols
  
  and ensure that the (windows only) rts_IOManagerIsWin32Native data
  symbol is marked as externally visible.
  

• 8ff4fdb5
  by David Eichmann at 2026-05-05T14:44:37-04:00

  Hadrian: Disable runtime pseudo relocations for RTS on windows hosts
  

• 96974723
  by Teo Camarasu at 2026-05-05T14:45:20-04:00

  ghci/TH: refactor to use IORef QState
  
  This is a pure refactor and shouldn't modify semantics at all
  

• eff6bfaf
  by Teo Camarasu at 2026-05-05T14:45:20-04:00

  iserv: recover/getQ/putQ should behave same as internal interpreter
  
  The internal and external interpreter should behave the same when
  handling `recover`, the exeception recovery method of Q.
  In practice, they diverge. In case of failure, the internal interpreter
  only restores error message state to before the computation, wheras the
  external interperter restores error message state *and* the state of putQ/getQ.
  
  As far as I can tell this is a simple mistake in the implementation.
  Note [TH recover with -fexternal-interpreter] describes the correct
  behaviour but the implementation doesn't mirror this.
  
  This change restores the correct behaviour by keeping the effects of
  putQ in the erroring computation.
  
  This is a breaking change since it modifies the behaviour of programs
  that rely on recover ignoring putQ from failling computations when used
  with the external interpreter. Although I highly doubt anyone relies on
  this behaviour.
  
  This divergence was first introduced in d00c308633fe7d216d31a1087e00e63532d87d6d.
  As far as I can tell this was unintentional and tha commit was trying to solve a different bug.
  
  Resolves #27022
  

• 1cb1d672
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Add dynamic trace flags API
  
  This commit adds an API to the RTS (exposed via Rts.h) that allows users to dynamically change the trace flags.
  Prior to this commit, users were able to stop and start the profiling and heap profiling timers (via startProfTimer/stopProfTimer and startHeapProfTimer/stopHeapProfTimer).
  This extends that functionality to also cover the core event types.
  
  The getTraceFlag/setTraceFlag functions read and write the values of the trace flag cache, which is allocated by Trace.c, rather than modifying the members of RtsFlags.TraceFlags.
  This is done under the assumption that the members of RtsFlags should not be modified after RTS initialisation.
  Consequently, if the user modifies the trace flags using setTraceFlag, the object returned by getTraceFlags (from base) will not reflect these changes.
  
  The trace flags are not protected by locks of any sort.
  Hence, these functions are not thread-safe.
  However, the trace flags are not modified by the RTS after initialisation, only read, so the race conditions introduced by one user modifying them are most likely benign.
  
  This PR also puts the trace flag cache in a single global struct, as opposed to a collection of global variables, and changes the types of the individual flags from uint8_t to bool, as these have the same size on both Clang and GCC and are a better semantic match.
  Prior to the change to uint8_t, they had type int, see 42c47cd6.
  Even with its deprecation in C23, I don't think there should be any issue depending on stdbool.h.
  The TRACE_X macros are redefined to access the global struct, with values cast to const bool to ensure they are read-only.
  

• 9d54dc94
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Ensure TRACE_X values are used in place of RtsFlags.TraceFlags.X
  

• 418d737b
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Fix nonmoving-GC tracing
  
  The current nonmoving-GC tracing functions were written in a different
  style from the other tracing functions. They were directly implemented
  as, e.g., a traceConcMarkEnd function that called postConcMarkEnd.
  The other tracing functions are implemented as, e.g., traceThreadLabel_,
  a function that posts the thread label event, and traceThreadLabel, a
  macro that checks whether TRACE_scheduler is set. This commit fixes that
  implementation, and ensures that the nonmoving-GC tracing functions only
  emit events if nonmoving-GC tracing is enabled.
  

• 99f4afa4
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Add SymI_HasProto for get/setTraceFlag
  

• 7e9eb8b9
  by Wen Kokke at 2026-05-06T09:53:40-04:00

  rts: Add SymI_HasProto for start/endEventLogging
  

• 3a3045fb
  by Wen Kokke at 2026-05-06T09:53:41-04:00

  rts: Add changelog entry
  

• a3b339a4
  by Teo Camarasu at 2026-05-06T09:54:25-04:00

  interface-stability/base: don't distinguish ws-32
  
  The interface of base is identical when the Word size is 32bits.
  Therefore, there is no need to have another file for this case.
  So, we delete it.
  
  Step towards: #26752
  

• eb922183
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Add a rts posix FdWakup utility module
  
  This will be used to implement wakeupIOManager for in-RTS I/O managers.
  
  It provides a notification/wakeup mechanism using FDs, suitable for
  situations when a thread is blocked on a set of fds anyway. It uses the
  classic self-pipe trick, or equivalently eventfd on supported platforms.
  
  This will initially be used to implement prompt interrupt or shutdown of
  the posix ticker thread.
  

• 01b0e233
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Add prompt shutdown to the pthread ticker implementation.
  
  The Linux timerfd ticker monitors a pipe which is used by exitTicker to
  ensure a prompt wakeup and shutdown. The pthread ticker lacked this and
  so would only exit at the next ticker wakeup (10ms by default).
  
  This patch adds the same mechanism to the pthread ticker.
  
  This changes the pthread ticker from waiting by using nanosleep() to
  waiting using either ppoll() or select(), so that it can wait on both
  a time and a file descriptor. On Linux at least, a test program to
  compare the timing jitter of these APIs shows that using nanpsleep,
  ppoll or select makes no statistical difference to the maximum or
  average jitter.
  
  This is a step towards unifying the posix ticker implementations, so
  that we can have just one portable one (albeit with some limited cpp).
  It is also a step towards using the ticker as part of a more general
  implementation of wakeUpRts, since this will require a method to wake
  the rts from a signal handler context (ctl-c handler).
  

• bc41d646
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Update ticker header commentary
  
  It was antique and didn't apply even to the previous implementation, and
  certainly not to the updated one.
  

• 4ed9a386
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Remove the timerfd-based ticker implementation
  
  There does not appear to be any remaining advantage on Linux to using
  the timerfd ticker implementation over the portable one (using ppoll on
  Linux for precise timing).
  
  The eventfd implementation was originally added at a time when Linux was
  still using a signal based implementation. So it made sense at the time.
  See (closed) issue #10840.
  

• 97504fa6
  by Duncan Coutts at 2026-05-07T14:28:50+01:00

  Consolidate to a single posix ticker implementation
  
  Previously we had four implementations, two using signals and two using
  threads. Having just one should make behaviour more consistent between
  platforms, and should make maintenance easier.
  

• 1e60023b
  by Facundo Domínguez at 2026-05-07T18:01:16-04:00

  Generalize so_inline to specify which bindings should be preserved
  
  This commit generalizes the so_inline option of the simple optimizer
  so we can indicate with a predicate the specific bindings that should
  be kept.
  
  This feature is important for the LiquidHaskell plugin, which relies on the
  simple optimizer to make core programs easier to read, but needs to preserve
  bindings that are relevant for verification.
  
  See https://gitlab.haskell.org/ghc/ghc/-/issues/24386 for the full discussion.
  

• 44cf9cd7
  by Wolfgang Jeltsch at 2026-05-12T09:48:18-04:00

  Move the `Text.Read` implementation into `base`
  

• 4ac3f7d6
  by Vladislav Zavialov at 2026-05-12T09:49:03-04:00

  EPA: Use AnnParen for tuples and sums
  
  Summary of changes
  
  * Do not use AnnParen in XListTy, replace it with EpToken "[" and "]"
  * Specialise AnnParen to tuple/sums by dropping the AnnParensSquare
    and keeping only AnnParens and AnnParensHash
  * Use AnnParen in XExplicitTuple
  * Use AnnParen in XExplicitTupleTy
  * Use AnnParen in XTuplePat
  * Use AnnParen in XExplicitSum (via AnnExplicitSum)
  * Use AnnParen in XSumPat (via EpAnnSumPat)
  
  This is a refactoring with no user-facing changes.
  

• 1bdcddec
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add minimal dlltool support to ghc-toolchain
  
  The dlltool is a tool that can create dll import libraries from .def
  files. These .def files list the exported symbols of dlls. Its somewhat
  like gnu linker scripts, but more limited.
  
  We will need dlltool to build the rts and ghc-internal libraries as DLLs
  on Windows. The rts and ghc-internal libraries have a recursive
  dependency on each other. Import libraries can be used to resolve
  recursive dependencies between dlls. We will use an import library for
  the rts when linking the ghc-internal library.
  

• f7fc3770
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add minimal dlltool support into ./configure
  
  Find dlltool, and hopefully support finding it within the bundled llvm
  toolchain on windows.
  

• e4e22bfb
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Update the default host and target files for dlltool support
  

• 5666c8f9
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add dlltool as a hadrian builder
  
  Optional except on windows.
  

• 5e14fe3f
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Update and generate libHSghc-internal.def from .def.in file
  
  The only symbol that the rts imports from the ghc-internal package now
  is init_ghc_hs_iface. So the rts only needs an import lib that defines
  that one symbol.
  
  Also, remove the libHSghc-prim.def because it is redundant. The rts no
  longer imports anything from ghc-prim.
  
  Keep libHSffi.def for now. We may yet need it once it is clear how
  libffi is going to be built/used for ghc.
  

• 3d91e4a6
  by Duncan Coutts at 2026-05-12T09:49:48-04:00

  Add rule to build libHSghc-internal.dll.a and link into the rts
  
  On windows only, with dynamic linking.
  
  This is needed because on windows, all symbols in dlls must be resolved.
  No dangling symbols allowed. References to external symbols must be
  explicit. We resolve this with an import library. We create an import
  library for ghc-internal, a .dll.a file. This is a static archive
  containing .o files that define the symbols we need, and crucially have
  ".idata" sections that specifies the symbols the dll imports and from
  where.
  
  Note that we do not install this libHSghc-internal.dll.a, and it does
  not need to list all the symbols exported by that package. We create a
  special purpose import lib and only use it when linking the rts dll, so
  it only has to list the symbols that the rts uses from ghc-internal
  (which is exactly one symbol: init_ghc_hs_iface).
  

• c8dae539
  by Alice Rixte at 2026-05-12T09:50:52-04:00

  Script for downloading and copying `base-exports` file
  

• 5fab2238
  by Wolfgang Jeltsch at 2026-05-12T21:24:27+03:00

  Introduce a cache of home module name providers
  
  This contribution introduces to the module graph a cache that maps home
  module names to sets of units providing them and changes the finder to
  use that cache. This is a performance optimization, especially for
  multi-home-unit builds.
  
  The particular changes are as follows:
  
    * In `GHC.Unit.Module.Graph`, `ModuleGraph` is extended with a new
      field `mg_home_module_name_providers_map`, exposed as
      `mgHomeModuleNameProvidersMap`. This is a cache that assigns to each
      home module name the set of IDs of home units that define it.
      Operations that construct module graphs are updated such that this
      cache stays synchronized.
  
    * In `GHC.Unit.Finder`, `findImportedModule` is changed to pull
      `mgHomeModuleNameProvidersMap` from `hsc_mod_graph` and pass it to
      `findImportedModuleNoHsc`, which now does not search home units in
      arbitrary order but prioritizes those units that the cache mentions
      as potential providers of the requested module.
  
  In addition, this contribution adds variants of the two multi-component
  compiler performance tests that use 100 units instead of 20, because
  with just 20 units the benefits from caching of home module name
  providers are still negligible.
  
  The following table shows the total time needed for running both
  multi-component tests before and after this contribution and with
  different numbers of units:
  
  | # of units | Before | After |
  |-----------:|-------:|------:|
  |         20 |   0:12 |  0:12 |
  |        100 |   0:47 |  0:42 |
  |        200 |   3:05 |  2:08 |
  
  Note that there seems to be a general overhead of 12 seconds that is not
  attributable to the actual tests, so that the real running times should
  be 12 seconds smaller than shown above.
  
  Resolves #27055.
  
  Metric Decrease:
      MultiComponentModules
      MultiComponentModulesRecomp
  
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  Co-authored-by: Fendor <fendor@posteo.de>
  

• 38b76b2f
  by Cheng Shao at 2026-05-13T17:48:48-04:00

  testsuite: mark T22159 as fragile
  
  This patch marks T22159 as fragile on Windows for issue described in #27248.
  Before we get to the bottom of those failures, this unblocks newer
  Windows runners.
  

• 50188615
  by Ian Duncan at 2026-05-14T13:45:07+02:00

  AArch64: use ASR not LSR for MO_U_Shr at W8/W16
  
  The unsigned right shift (MO_U_Shr) for sub-word widths (W8, W16)
  with a variable shift amount was emitting ASR (arithmetic/signed shift
  right) after zero-extending with UXTB/UXTH. This should be LSR
  (logical/unsigned shift right). After zero-extension the upper bits
  happen to be 0 so ASR produces the same result, but it is semantically
  wrong and would break if the zero-extension were ever optimized away.
  Includes assembly output test (grep for lsr) and runtime test
  verifying unsigned right shift of Word8 and Word16 values.
  

• 28666fbf
  by Vladislav Zavialov at 2026-05-19T12:44:05-04:00

  Add type families: Tuple, Constraints, Tuple#, Sum# (#27179)
  
  These type families map tuples of types to the corresponding Tuple<N>,
  Tuple<N>#, CTuple<N>, and Sum<N># types. Some examples at N=2:
  
  	Tuple (Int, Bool)          = Tuple2 Int Bool
  	Constraints (Show a, Eq a) = CTuple2 (Show a) (Eq a)
  	Tuple# (Int#, Float#)      = Tuple2# Int# Float#
  	Sum# (Int#, Float#)        = Sum2# Int# Float#
  
  See GHC Proposal #145 "Non-punning list and tuple syntax".
  
  To make the Sum# instance at N=64 possible, this patch also introduces
  the Sum64# constructor declaration and bumps mAX_SUM_SIZE from 63 to 64.
  
  Metric Increase:
      ghc_experimental_dir
  

• 41c2448b
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  rts: Add IPE event class for -l
  
  This commit adds a new IPE event class to the -l RTS flag.
  Previously, IPE events were enabled unconditionally.
  However, the IPE events can easily grow to hundreds or thousands of megabytes.
  With the new event class you can pass, e.g., -l-I to disable IPE events.
  

• 62536551
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  ghc-internal: Add TraceFlags.traceIPE
  

• e45312d1
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  testsuite: Add test for TraceFlags.traceIpe
  

• 4768d9aa
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  ghc-internal: Add DebugFlags.ipe
  

• bc1b5c69
  by Wen Kokke at 2026-05-19T12:44:53-04:00

  testsuite: Add test for DebugFlags.ipe
  

• 0da1543f
  by Duncan Coutts at 2026-05-19T12:45:37-04:00

  Document removal of the signal-based interval timer
  
  Update mentions within the RTS section of the users guide.
  
  Add a changelog entry.
  

• b2911514
  by Duncan Coutts at 2026-05-19T12:45:37-04:00

  Fix section for an recent changelog entry
  

• d6d76a7a
  by David Eichmann at 2026-05-19T12:46:19-04:00

  ghc-toolchain: implement llvm program versioning logic
  

• 2dd36fa3
  by Wolfgang Jeltsch at 2026-05-20T04:49:52-04:00

  Turn `Trustworthy` into `Safe` in `base` where possible
  

• f4399dd1
  by Wolfgang Jeltsch at 2026-05-20T04:50:37-04:00

  Make the current `base` buildable with GHC 10.0
  

• 1a7de232
  by Duncan Coutts at 2026-05-20T12:26:25-04:00

  Hadrian: remove legacy rts .so symlinks
  
  For compatibility with the old makefile based build system, hadrian had
  rules to generate symlinks from unversioned to versioned names for the
  rts .so/.dynlib file, like libHSrts-ghcx.y.so -> libHSrts-1.0.3-ghcx.y.so
  
  We no longer need these symlinks since the makefile build system has
  been retired some time ago. The need for these symlinks is awkward on
  windows where we cannot (in practice) create symlinks. So rather than
  make them conditional (non-windows), just remove them entirely.
  

• 286f1adf
  by fendor at 2026-05-20T12:27:09-04:00

  Fix regression T27202: `:load` and `:add` work in GHCi
  
  To fix the regression there are conceptually two major things that we
  fix:
  
  * We don't remove the `importDirs` from `interactive-session`
  * When `:add`ing a module, we don't try to find them via PackageImports
      * The PackageImport is wrong as we can't know the package-name at
        this stage in ghc/UI.hs
  
  What does it mean to not remove the `importDirs` from
  `interactive-session`?
  It means that, given some initial `DynFlags`, we will use those
  `importDirs` in `interactive-session`.
  
  The initial `DynFlags`, however, depend on how you initialise the GHC
  session.
  For a simple session, initialised by
  
      ghc -isrc -this-unit-id main
  
  It is simple, just use the `DynFlags` given on the cli.
  Thus, `main` and `interactive-session` will have the same `DynFlags`,
  except for the `homeUnitId` and `interactive-session` depends on `main`
  by construction of the GHCi session.
  
  What about a multiple home unit session, though?
  
      ghc -unit @unit1 -unit @unit2
  
  What are the `DynFlags` in this cli invocation? It shouldn't be either
  `@unti1` nor `@unit2`, as the order shouldn't matter or any other
  implicit condition.
  
  For consistency, we decide that the initial `DynFlags` are the top
  `DynFlags` on the cli, ignoring `-unit` flags.
  Thus, in this example, there are no `importsDirs` regardless of what we
  might find in `@unit1` and `@unit2`.
  
  But in this invocation:
  
      ghc -isrc -unit @unit1 -unit @unit2
  
  The `interactive-session` will have the `importsDirs` `src`.
  Note, `-isrc` will be inherited in `@unit1` and `@unit2`, so you need to
  explicitly use `-i` to clear the `importsDirs`, in order to avoid
  accidentally adding `src` as an import directory to all other home
  units.
  
  This fix has been made possible by the improvements introduced in
  !15888, which avoids ambiguity when a home unit shares the `importsDirs`
  with the `interactive-session`, on top of being much faster for multiple
  home units.
  
  Adds regression tests for T27202 for `:load`ing and `:add`ing modules
  that are located in import directories.
  

• 728662de
  by fendor at 2026-05-20T12:27:09-04:00

  Use home unit package db stacks in GHCi prompt and session unit
  
  In order to import modules from home unit dependencies (e.g., `Data.Map`),
  the ghci prompt unit needs to populate its `UnitState`.
  This is tricky to handle correctly, which `PackageDBFlag`s should we use
  to populate the `UnitState`?
  We decide, the most intuitive solution for users is to depend on all
  `PackageDBFlag`s, so that any dependency can be imported in GHCi.
  This assumes consistency in the `PackageDBFlag`s, so no two home units
  specify `PackageDBFlag`s that are inconsistent with each other.
  
  We could simply concat all the `PackageDBFlag`s of the existing home
  units, but later `PackageDBFlag`s shadow earlier ones, leading to the
  last processed home units' `PackageDBFlag`s to shadow the earlier ones.
  This is hard to fix, we need to give users the capability to provide ghc
  options for the ghci prompt home unit.
  However, as this is considerably more work, we decided on an
  approximation that should work out most of the time.
  
  Package Db stacks in cabal and stack follow a certain structure:
  
      -no-user-package-db > -package-db $cabal-store > -package-db $local-db
  
  The first two arguments are always the same, namely the
  `-no-user-package-db` and `-package-db`.
  We compute the longest common prefix over all home units, and use that
  as the start of the package db stack. Then, over the rest of the
  `PackageDBFlag`s, we simply take the union and append them to our
  initial stack.
  We assume, that the rest of package dbs only defines very few, "local"
  units that are usually not shadowing each other.
  
  This allows us to get a relatively consistent package database stack for
  the ghci prompt home unit.
  
  Similar reasoning applies to the session unit in order to add modules to
  the session and have dependencies available in the module.
  
  We do something similar for `-package` flags, to make sure only the
  correct units are actually visible in the ghci session.
  This time, we simply take the union of all `PackageFlag`s, allowing us
  to import modules from the home unit dependencies.
  
  In the future, it would be beneficial to allow the user to provide the
  exact ghc options to control the visibilities. For now, this will have
  to do.
  

• 740d89a0
  by Simon Peyton Jones at 2026-05-20T17:20:44-04:00

  Do not use mkCast during typechecking
  
  This commit fixes #27219.  The problem was that the typechecker was using
  `mkCast`, whose assertion checks legitimately fail when applied to types
  that contain unification variables.
  

• a50fdb06
  by Simon Peyton Jones at 2026-05-20T17:20:45-04:00

  Major refactor of the Simplifier
  
  The main payload of this patch is to refactor the Simplifer to avoid
  repeated simplification when using Plan (AFTER) for rule rewrites.
  The need for this was shown up by #26989.
  
  See Note [Avoid repeated simplification] in GHC.Core.Opt.Simplify.Iteration.
  
  Related refactoring:
  
  * Refactor the two fields `sc_dup` and `sc_env` in `ApplyToVal` into one, `sc_env`.
    Reason: the envt is irrelevant in the "simplified" case, so the data type describes
    the possiblitiies much more accurately now.
  
  * Some refactoring in `knownCon` to split off `wrapDataConFloats`.
  
  * Refactor `lookupRule` and its auxiliary functions to return `RuleMatch`,
    a new data type. See Note [data RuleMatch] in GHC.Core. Ditto for BuiltinRule.
  
    This RuleMatch returns fragments of the target in rm_args and rm_floats,
    leaving `rm_rhs` to be the stuff from the RULE itself.
  
    Doing this has routine consequences in GHC.Core.Opt.ConstantFold. Many changes
    there but all routine.
  
  * When doing occurrence analysis on RULEs, make the occ-info on the rule
    binders relate just to the RHS, not the LHS.  See (OUR1) in
    Note Note [OccInfo in unfoldings and rules]
  
    This means that Lint must not complain about the fact that the patterns
    in the RULE mentions binders that are marked dead.
    See Note [Dead occurrences] in GHC.Core.Lint.
  
    I changed the Core pretty-printer so that it didn't suppress dead binders,
    else I can't see those binders in RULEs.  That led to quite a lot of testsuite wibbles.
  
  * Refactor FloatBinds, so that it is used both by
    `exprIsConApp_mabye` and by `lookupRule`
    * Move the definition of FloatBinds out of GHc.Core.Make, into GHC.Core.
    * Add FloatTick as an extra constructor.
    * Refactor `lookupRule` to use `FloatBinds` instead of `BindWrapper`.
    This refactor just shares more code.
  
    (Rename GHC.Core.Opt.FloatOut.FloatBinds to FloatLets, to avoid gratuitious
    name clash with GHC.Core.FloatBinds.)
  
  Corecion optimisation
  
  * In simpleOpt, when composing coercions, call new function `optTransCo`.
    This is much lighter weight than full blown coercion optimisation.
  
  * Make `GHC.Core.Opt.Arity.pushCoValArg` and `pushCoTyArg` return the
    coercionLKind of the coercion. This saves recomputing that coercionLKind
    at the key call sites in GHC.Core.Opt.Simplify.Iteration.pushCast.
  
  * Rename `addCoerce` in GHC.Core.Simplify.Iteration to become `pushCast`.
  
  * In the `ApplyToVal` case of `pushCast` we had a very unsavoury call to `simplArg`.
    I eliminated it by adding a field `sc_cast` to `ApplyToVal` that records any
    pending casts.  Much nicer now.  See Note [The sc_cast field of ApplyToVal].
  
  * Don't optimise coercions if the type-substitution is empty.
    See Note [Optimising coercions] in GHC.Core.Opt.Simplify.Iteration.
  
  The fix for #26838 is dramatic.  For the test in perf/compiler/T26839 we have
  
     Compiler allocs:  Before: 7,363M
                       After:    688M
  
  Compile time goes down generally.  Here are compiler-alloc changes
  over 0.5%:
             CoOpt_Read(normal)    729,184,920   -0.7%
       CoOpt_Singletons(normal)    666,916,960   -4.6% GOOD
            LargeRecord(normal)  1,227,056,876   +1.1%
                 T12227(normal)    256,827,604   -4.6% GOOD
                 T12425(optasm)     76,879,410   -0.8%
                 T12545(normal)    787,826,918  -10.8% GOOD
                 T12707(normal)    775,186,464   -0.9%
                 T13253(normal)    318,599,596   -0.8%
                 T14766(normal)    685,857,320   -1.0%
                 T15304(normal)  1,123,333,422   -2.2%
                 T15630(normal)    123,142,330   -2.6%
                T15630a(normal)    123,092,100   -2.6%
                 T15703(normal)    299,751,682   -2.9% GOOD
                 T17516(normal)    964,072,280   +1.0%
                 T18223(normal)    367,016,820   -6.2% GOOD
                 T18730(optasm)    130,643,770   -3.3% GOOD
                 T20261(normal)    535,608,584   -0.7%
                T21839c(normal)    340,340,436   -0.9%
                 T24984(normal)     85,568,392   -1.9%
                  T3064(normal)    174,631,992   -1.2%
                  T3294(normal)  1,215,886,432   -0.7%
                  T5030(normal)    141,449,704  -17.2% GOOD
               T5321Fun(normal)    258,484,744   -1.9%
                  T8095(normal)    770,532,232   -2.7%
                  T9630(normal)    858,423,408  -14.5% GOOD
                 T9872c(normal)  1,591,709,448   +0.7%
    info_table_map_perf(normal) 19,700,614,458   -1.3%
  
                      geo. mean                  -0.7%
                      minimum                   -17.2%
                      maximum                    +1.1%
  
  However, strangely there seems to be a 5.0% increase in CoOpt_Read in
  the x86_64-linux-fedora43-validate+debug_info+ubsan job, although
  there generally a /decrease/ in this test in other builds.  The baseline
  value looks strange.  Anyway I'll just accept it.
  
  Metric Decrease:
      CoOpt_Singletons
      T12227
      T12545
      T12707
      T15703
      T18223
      T18730
      T21839c
      T5030
      T9630
  
  Metric Increase:
      CoOpt_Read
  

• 834623d4
  by Mrjtjmn at 2026-05-20T17:21:41-04:00

  users-guide: Fix weird notation in "Summary of stolen syntax"
  

• 6f9d7c71
  by Markus Läll at 2026-05-21T15:25:34-04:00

  Use "grimily" instead of "grimly"
  
  Fixes https://gitlab.haskell.org/ghc/ghc/-/issues/27221
  

• 50e999ca
  by fendor at 2026-05-21T15:26:18-04:00

  Speed up 'closure' computation in `ghc-pkg`
  
  Cache the set of already seen `UnitId`s and use `Set` operations to
  speed up 'closure' computation.
  
  Further simplify the implementation of 'closure' to account for the
  actual usage.
  As a consequence, we rename 'closure' to 'brokenPackages' to reflect its
  purpose better after the simplification.
  

• 7ecc6184
  by sheaf at 2026-05-21T15:27:10-04:00

  TcMPluginHandling: be more lenient when no plugins
  
  This change ensures that, if a function such as 'typecheckModule' was
  invoked with 'NoTcMPlugins', GHC doesn't spuriously complain about TcM
  plugins having already been stopped, as there were none to start with.
  

• 72c8de5c
  by Simon Jakobi at 2026-05-23T18:41:42-04:00

  Implement List.elem via foldr
  
  ...in order to allow specialization to Eq instances.
  
  The implementation of notElem is updated for consistency.`
  
  Corresponding CLC proposal:
  https://github.com/haskell/core-libraries-committee/issues/412
  
  Addresses #27096.
  

• 3268c610
  by Alan Zimmerman at 2026-05-23T18:42:30-04:00

  EPA: Fix span for qualified multiline string
  
  Fix the span for a qualified multiline string like
  
    Text."""
      I'm a multiline
      Text value
      !
    """
  
  to extend to the end of the entire string, not just the first line.
  
  Closes #27274
  

• 1f096790
  by Alan Zimmerman at 2026-05-23T18:43:20-04:00

  EPA: Fix exact printing namespace-specified wildcards
  
  Ensures correct printing of imports of the form
  
     import Data.Bool (data True(data ..))
     import Data.Bool (data True(type ..))
  
  Closes #27291
  

• 56ada7c0
  by Mrjtjmn at 2026-05-23T18:44:19-04:00

  Fix ambiguous syntax of BangPatterns in users guide
  
  Update documentation for the BangPatterns extension to specify
  how surrounding whitespace affects interpretation of `!`.
  
  * Only when there is whitespace before `!` and no whitespace after,
    it is recognized as a BangPattern.
  * Other cases `⟨varid⟩!⟨varid⟩`, `⟨varid⟩ ! ⟨varid⟩`, `⟨varid⟩! ⟨varid⟩`
    are treated as infix operators.
  

• 579aa0b7
  by Simon Jakobi at 2026-05-25T16:31:26-04:00

  Ensure that SetOps.{minusList,unionListsOrd} can be specialized
  
  ...by marking them INLINABLE. Haddock allocates 0.1–0.3% less as a
  result.
  
  This also removes some redundant constraints on unionListsOrd.
  

• cccf45da
  by Cheng Shao at 2026-05-25T16:32:13-04:00

  wasm: ensure post-linker output is synchronous ESM
  
  This patch fixes wasm backend's post-linker output script to ensure
  it's synchronous ESM and doesn't use top-level await, which doesn't
  work in ServiceWorkers. Fixes #27257.
  

• 8db331a3
  by Zubin Duggal at 2026-05-26T04:54:03-04:00

  Update to semaphore-compat 2.0.0 using v2 of the protocol
  
  On Linux and other POSIX platforms, GHC's -jsem jobserver client now
  speaks v2 of the semaphore-compat protocol, which uses Unix domain
  sockets in place of POSIX named semaphores. This avoids the libc-ABI
  issues that affected the old implementation. Windows is unaffected
  and continues to use the v1 protocol (Win32 named semaphores); its
  reported protocol version remains v1.
  
  When GHC receives a -jsem name whose protocol version it does not
  support, it emits a -Wsemaphore-version-mismatch warning and falls
  back to -j<N> rather than crashing. ghc --info exposes the supported
  version in a new "Semaphore version" entry so cabal-install can detect
  a mismatch before invoking GHC.
  
  Users on a cabal-install that predates the v2 update will continue to
  build successfully on Linux/POSIX, but will lose the cross-process
  -jsem coordination and fall back to -j<N> per GHC invocation. Users
  must upgrade to a cabal-install that supports protocol v2 to recover
  full parallelism.
  
  Also fix a leak in cleanupSem (#27253): cleanupSem used to snapshot
  heldTokens and release them before killing the loop, while the loop's
  in-flight acquire/release children could still be mutating it.
  Cleanup now runs inside the loop's own exit handler, after draining
  the active child via a new activeChild TVar, so the snapshot has no
  concurrent mutator.
  
  See also:
    - GHC proposal amendment:  https://github.com/ghc-proposals/ghc-proposals/pull/673
    - cabal-install patch:     https://github.com/haskell/cabal/pull/11628
    - semaphore-compat MR:     https://gitlab.haskell.org/ghc/semaphore-compat/-/merge_requests/8
  
  Bump semaphore-compat submodule to 2.0.0
  
  Fixes #25087 and #27253
  

• 17be4f1f
  by Alan Zimmerman at 2026-05-26T04:54:52-04:00

  EPA: Record semicolons in HsModifier
  
  Ensure the semi colons are captured in the ParsedSource for code like
  
    %True;; %False;
    instance C D
  
  It makes HsModifier (and hence HsModifierOf) LocatedA, so the semi
  colons can be recorded as [TrailingAnn]
  
  Also rename pprHsModifiers to pprLHsModifiers to match.
  
  Closes #27294
  

• 8f991755
  by fendor at 2026-05-26T11:02:52-04:00

  Revert prog003 acceptance
  
  We thought the commit 286f1adff3e78d775ff325caff71d0cee25d710b fixed the
  test, but due to changes to ghci, modules loaded during the GHCi
  session, the test was actually no longer testing what it set out to do,
  "fixing" the broken test.
  
  As modules are added to the `interactive-session` home unit, the object code needs
  to be compiled with `-this-unit-id interactive-session`, otherwise the
  object code won't be used.
  Once this has been fixed in the test, the test fails as expected again.
  

• 277a3687
  by mangoiv at 2026-05-26T11:03:40-04:00

  libraries/process: bump submodule to v1.6.29.0
  
  This submodule bump resolves a segfault on macos 15.
  Fixes #27144
  

• 6779bb0c
  by mangoiv at 2026-05-26T11:03:40-04:00

  libraries/unix: in submodule, don't pick branch 2.7
  
  The 2.7 branch is outdated and the module has been advanced far beyond
  it anyway, so remove that line.
  

• 4a645683
  by Simon Peyton Jones at 2026-05-27T21:41:59-04:00

  Trim the continuation in mkDupableContWithDmds
  
  When there are no remaining argument demands, it means the application
  is bottoming. In this case, we can trim the continuation to avoid the
  panic that was observed in #27261.
  
  See Note [Trimming the continuation for bottoming functions] in
  GHC.Core.Opt.Simplify.Iteration.
  

• 8ab506ff
  by Cheng Shao at 2026-05-27T21:42:47-04:00

  ghci: fix module name string lifetime in hs_hpc_module invocation
  
  This patch makes hpcAddModule pass a properly malloced module name
  string to hs_hpc_module, instead of using useAsCString which causes
  use-after-free of module name string. Fixes #27297.
  
  Co-authored-by: Codex <codex@openai.com>
  

• b0233814
  by sheaf at 2026-05-27T21:43:31-04:00

  Relax acceptance threshold for T10421
  
  As seen in #27289, the 1% acceptance threshold for this text was
  overly narrow, resulting in spurious test failures. This commit widens
  the acceptance threshold to 2%. Fixes #27289.

• 63ce5770
  by Luite Stegeman at 2026-05-28T12:23:35-04:00

  Fixes for black holes
  
   - suspend duplicate work for eager black holes
   - detect eager black holes in checkBlockingQueues
   - don't overwrite existing black holes even if they're not
       in an eager blackhole frame
   - don't deadlock on self when thunk is already blackholed
  
  Fixes #26936
  

• 037a80dc
  by Tom McLaughlin at 2026-05-28T12:24:36-04:00

  Event/Windows.hsc: rethrow exceptions in overlapped IO
  
  This prevents the WinIO manager from swallowing exceptions in overlapped IO. It
  was added to make WinIO support possible in the `network` library. See
  https://gitlab.haskell.org/ghc/ghc/-/issues/27283.
  
  We also bump __IO_MANAGER_WINIO__ to 2 so libraries can gate on this using CPP.
  

• 2d53bcdb
  by Wolfgang Jeltsch at 2026-05-28T12:25:21-04:00

  Allow `downsweep` to use nodes of an existing module graph
  
  To this end, `downsweep` has not been able to use the nodes of a module
  graph obtained from a previous downsweeping round. In some GHC API
  applications, downsweeping is performed somewhat incrementally and
  therefore could profit from reusing such existing results. This
  contribution makes this possible.
  
  Resolves #27054.
  
  Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
  

• f4fbb583
  by Simon Jakobi at 2026-05-28T12:26:04-04:00

  Add regression test for T11226
  
  Closes #11226.
  

• ed29a5e6
  by Sven Tennie at 2026-05-28T17:30:36-04:00

  Add optional config setting for LibDir (#19174)
  
  Previously, the `libDir` was derived from `topDir`. This won't work for
  inplace stage2 cross-compilers where binaries and libraries are in
  different stage dirs (`_build/stage1/` for executables and
  `_build/stage2` for libraries).
  
  `LibDir` is set in the inplace `settings` files. For bindists, we
  generate a new `settings` file with no `LibDir` entry. GHC then defaults
  to use `topDir` as `libDir` again. This keeps the bindist relocatable.
  
  If `LibDir` is a relative path, it is interpreted relatively to
  `topDir`.
  
  The global package db is part of the `lib/` folder. If we want to point
  for inplace cross-compilers to the succeeding stage's folder, this is
  done by setting `LibDir`. Thus, the global package db must be found
  relative to `libDir`` (which may default to `topDir` or be set by
  `LibDir`).
  
  The complexity of settings becomes scary. So, add a test to ensure
  `LibDir` works as expected.
  

• 8339cf8f
  by Sven Tennie at 2026-05-28T17:30:36-04:00

  Add Haddock to FileSettings
  
  Helping to understand the fields' meanings without deeper analyses.
  

• 4ce251e4
  by Sylvain Henry at 2026-05-28T17:31:39-04:00

  foundation test: skip signed minBound `quot` (-1) (#27222)
  
  `minBound `quot` (-1)` for fixed-width signed integers is platform
  dependent: the mathematical result -minBound is not representable in
  the type. On x86, IDIV traps; LLVM's sdiv is undefined behaviour in
  this case; on AArch64/RISC-V, SDIV wraps to minBound.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• b8ba7e61
  by Simon Jakobi at 2026-05-28T17:32:23-04:00

  Prevent dictionary-passing in checkTyEqRhs
  
  ...by pre-specializing it to TcM.
  
  Previously, wherever checkTyEqRhs was used in other modules, the
  Core showed dictionary passing ($fMonadIOEnv). The added SPECIALIZE
  pragma prevents this.
  

• d603477f
  by David Eichmann at 2026-05-29T13:17:12-04:00

  Hadrian: create a ghc-internal .def file per ghc-internal dll
  
  The .def file generated from rts/win32/libHSghc-internal.def.in contains
  the name of the ghc-internal dll. The correct dll name differs based
  on if the dll is inplace/final and if using the Dynamic way. Previously,
  this was not accounted for and inconsistent dlls names where used. That
  led to failure when loading dlls at runtime in experiments with windows
  dynamic linking.
  

• 1fc21753
  by Sylvain Henry at 2026-05-29T13:18:14-04:00

  ghc-bignum: copy backend interface haddocks to Native backend (#27305)
  
  The haddock comments documenting the BigNat backend interface (function
  contracts, expected MutableWordArray# sizes, return-value semantics, etc.)
  were attached to the FFI backend module. Copy them to the Native backend
  so they remain in tree once the FFI backend is removed.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 717059df
  by Sylvain Henry at 2026-05-29T13:18:14-04:00

  ghc-bignum: remove FFI backend (#27305)
  
  The FFI backend of ghc-bignum (now part of ghc-internal) had no known
  users and is easy to recreate by relinking ghc-internal with a custom
  backend. Remove the backend module, the bignum-ffi cabal flag, and the
  ffi option from Hadrian's --bignum selector. The backend interface
  documentation now lives in the Native backend module.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 4bb3b1d8
  by Sylvain Henry at 2026-05-29T13:18:14-04:00

  ghc-bignum: remove Check backend (#27305)
  
  The Check backend of ghc-bignum (now part of ghc-internal) compared the
  selected backend's output against the Native backend for validation.
  It had no known users. Remove the backend module, the bignum-check
  cabal flag, the bignumCheck Hadrian flavour field, and the check-
  prefix in Hadrian's --bignum selector.
  
  Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
  

• 6b3044a0
  by David Eichmann at 2026-05-30T11:58:48-04:00

  Add code comments to allocator code
  

• f4e04210
  by Matthew Pickering at 2026-05-30T11:59:34-04:00

  hadrian: Refactor system-cxx-std-lib rules
  
  I noticed a few things wrong with the hadrian rules for
  `system-cxx-std-lib` rules.
  
  * For `text` there is an ad-hoc check to depend on `system-cxx-std-lib`
  outside of `configurePackage`.
  * The `system-cxx-std-lib` dependency is not read from cabal files.
  * Recache is not called on the packge database after the `.conf` file is
  generated, a more natural place for this rule is `registerRules`.
  
  Treating this uniformly like other packages is complicated by it not
  having any source code or a cabal file. However we can do a bit better
  by reporting the dependency firstly in `PackageData` and then needing
  the `.conf` file in the same place as every other package in
  `configurePackage`.
  
  This commit increases the `shakeVersion`, to provide backwards
  compatibility to previous builds with different PackageData.
  
  Fixes #25303
  
  Co-authored-by: Sven Tennie <sven.tennie@gmail.com>
  

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

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

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

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

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

  fix typo : compete with performance, not complete

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

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

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

  Fix #27067 - Clarify haddocks on `minusNaturalMaybe`
  

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

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

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

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

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

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

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

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

• 633a3176
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Remove Type from StgOpApp
  

• 4e632721
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Fix issues and remove Type from StgFCallOp
  

• 8e3ad21e
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Remove Type from StgRhsClosure
  

• 91d9771a
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Remove redundant whitespace
  

• 3f7d47a5
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Add note about tagToEnum# in STG
  

• a6cef2b0
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Remove kind from StgOpApp
  

• aec429b0
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  FIx whitespace
  

• 8ed8e818
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Post-merge fixes
  

• bfd53342
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Do almost all the todos
  

• 0c63024e
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  One more thing
  

• c9e904f1
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Remove EOL whitespace
  

• af7c98e9
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Remove redundant import
  

• 2b64bd58
  by Jaro Reinders at 2026-06-06T17:29:32+02:00

  Fix two remaining issues
  

690 changed files:

• .gitlab/generate-ci/gen_ci.hs
• .gitlab/jobs.yaml
• .gitlab/merge_request_templates/Default.md
• .gitmodules
• boot
• + changelog.d/T19174.md
• + changelog.d/T26979
• + changelog.d/T27022
• + changelog.d/T27131
• + changelog.d/T27182.md
• + changelog.d/T27202
• + changelog.d/T27261
• + changelog.d/binary-array-no-list
• + changelog.d/bump-process
• + changelog.d/bytecode-interpreter-hpc-support
• + changelog.d/cmm-import-syntax-changes
• + changelog.d/dynamic-trace-flags
• + changelog.d/elem-via-foldr-27096
• + changelog.d/fix-blackhole-handling
• + changelog.d/fix-finalizers-27072
• + changelog.d/ghc-api-epa-parens
• + changelog.d/ghc-api-holes-ast-27111
• + changelog.d/ghc-api-namespace-specifier-26678
• + changelog.d/ghc-pkg-faster-closure
• + changelog.d/hadrian-response-files.md
• + changelog.d/hadrian-system-cxx-std-lib-25303
• + changelog.d/ipe-event-class
• + changelog.d/jobserver-leak-fix
• + changelog.d/lib-add-tuple-tyfam-27179
• + changelog.d/libdir-setting
• + changelog.d/llvm-22
• + changelog.d/module-graph-reuse-in-downsweep
• + changelog.d/more-efficient-home-unit-imports-finding
• + changelog.d/no-more-timer-signal
• + changelog.d/remove-bignum-check-backend
• + changelog.d/remove-bignum-ffi-backend
• + changelog.d/rts_symlinks.md
• + changelog.d/semaphore-v2
• + changelog.d/so_inline_is_a_predicate
• + changelog.d/tcplugin_init.md
• + changelog.d/tcplugins-pmc.md
• + changelog.d/typecheckModule-API.md
• + changelog.d/wasm-fix-serviceworker
• + changelog.d/windows-rethrow-overlapped-exception
• + changelog.d/withTcPlugins.md
• compiler/GHC.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Binary.hs
• compiler/GHC/ByteCode/Instr.hs
• compiler/GHC/ByteCode/Types.hs
• compiler/GHC/Cmm/Lexer.x
• compiler/GHC/Cmm/Parser.y
• compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
• compiler/GHC/CmmToAsm/BlockLayout.hs
• compiler/GHC/CmmToAsm/X86/CodeGen.hs
• compiler/GHC/CmmToLlvm/Base.hs
• compiler/GHC/CmmToLlvm/CodeGen.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Coercion.hs
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/Lint.hs
• compiler/GHC/Core/Make.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/FloatIn.hs
• compiler/GHC/Core/Opt/FloatOut.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/OccurAnal.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Ppr.hs
• compiler/GHC/Core/Rules.hs
• compiler/GHC/Core/SimpleOpt.hs
• compiler/GHC/Core/TyCo/Subst.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToStg.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/FastString.hs
• compiler/GHC/Data/List/SetOps.hs
• compiler/GHC/Data/Pair.hs
• compiler/GHC/Driver/Backend.hs
• compiler/GHC/Driver/Backpack.hs
• compiler/GHC/Driver/CodeOutput.hs
• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Config/Interpreter.hs
• compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env/Types.hs
• compiler/GHC/Driver/Errors/Ppr.hs
• compiler/GHC/Driver/Errors/Types.hs
• compiler/GHC/Driver/Flags.hs
• compiler/GHC/Driver/Main.hs
• + compiler/GHC/Driver/Main/Compile.hs
• compiler/GHC/Driver/Main.hs-boot → compiler/GHC/Driver/Main/Compile.hs-boot
• + compiler/GHC/Driver/Main/Hsc.hs
• + compiler/GHC/Driver/Main/Interactive.hs
• + compiler/GHC/Driver/Main/Passes.hs
• + compiler/GHC/Driver/Main/Passes.hs-boot
• compiler/GHC/Driver/Make.hs
• compiler/GHC/Driver/MakeAction.hs
• compiler/GHC/Driver/MakeSem.hs
• compiler/GHC/Driver/Pipeline.hs
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Pipeline/Monad.hs
• compiler/GHC/Driver/Pipeline/Phases.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/Dump.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Expr.hs-boot
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Pat.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Coverage.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Errors/Ppr.hs
• compiler/GHC/HsToCore/Errors/Types.hs
• compiler/GHC/HsToCore/Foreign/JavaScript.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc.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
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• compiler/GHC/ThToHs.hs
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• compiler/GHC/Types/Error.hs-boot
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• configure.ac
• distrib/configure.ac.in
• docs/users_guide/debug-info.rst
• docs/users_guide/extending_ghc.rst
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• testsuite/tests/printer/T18052a.stderr
• + testsuite/tests/printer/Test27291.hs
• testsuite/tests/printer/all.T
• + testsuite/tests/profiling/should_compile/T27182.hs
• testsuite/tests/profiling/should_compile/all.T
• testsuite/tests/profiling/should_run/callstack001.stdout
• testsuite/tests/quasiquotation/T7918.hs
• + testsuite/tests/rts/T25275/DebugIpe.hs
• + testsuite/tests/rts/T25275/T25275_A.stdout
• + testsuite/tests/rts/T25275/T25275_B.stdout
• + testsuite/tests/rts/T25275/T25275_C.stdout
• + testsuite/tests/rts/T25275/T25275_D.stdout
• + testsuite/tests/rts/T25275/TraceIpe.hs
• + testsuite/tests/rts/T25275/all.T
• + testsuite/tests/rts/T27131.hs
• + testsuite/tests/rts/T27131.stdout
• + testsuite/tests/rts/T27131_c.c
• testsuite/tests/rts/all.T
• + testsuite/tests/rts/linker/T27072/Lib.c
• + testsuite/tests/rts/linker/T27072/Makefile
• + testsuite/tests/rts/linker/T27072/T27072.stdout
• + testsuite/tests/rts/linker/T27072/all.T
• + testsuite/tests/rts/linker/T27072/main.c
• testsuite/tests/simd/should_run/all.T
• testsuite/tests/simd/should_run/simd006.hs
• testsuite/tests/simplCore/should_compile/DsSpecPragmas.stderr
• testsuite/tests/simplCore/should_compile/RewriteHigherOrderPatterns.stderr
• testsuite/tests/simplCore/should_compile/T15205.stderr
• testsuite/tests/simplCore/should_compile/T18668.stderr
• testsuite/tests/simplCore/should_compile/T19246.stderr
• testsuite/tests/simplCore/should_compile/T19599.stderr
• testsuite/tests/simplCore/should_compile/T19599a.stderr
• testsuite/tests/simplCore/should_compile/T21917.stderr
• testsuite/tests/simplCore/should_compile/T23074.stderr
• testsuite/tests/simplCore/should_compile/T24359a.stderr
• testsuite/tests/simplCore/should_compile/T25160.stderr
• testsuite/tests/simplCore/should_compile/T25718c.stderr-ws-32
• testsuite/tests/simplCore/should_compile/T25718c.stderr-ws-64
• testsuite/tests/simplCore/should_compile/T26051.stderr
• testsuite/tests/simplCore/should_compile/T26116.stderr
• + testsuite/tests/simplCore/should_compile/T27261.hs
• + testsuite/tests/simplCore/should_compile/T27261_aux.hs
• testsuite/tests/simplCore/should_compile/T8331.stderr
• testsuite/tests/simplCore/should_compile/T8848a.stderr
• testsuite/tests/simplCore/should_compile/all.T
• testsuite/tests/simplCore/should_compile/spec004.stderr
• testsuite/tests/tcplugins/Common.hs
• testsuite/tests/tcplugins/RewritePerfPlugin.hs
• testsuite/tests/tcplugins/T11462_Plugin.hs
• testsuite/tests/tcplugins/T11525_Plugin.hs
• testsuite/tests/tcplugins/T26395_Plugin.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.script
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stderr
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Ghci.stdout
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.hs-boot
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode.stderr
• + testsuite/tests/tcplugins/TcPlugin_InitStop_NoCode_aux.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.hs
• + testsuite/tests/tcplugins/TcPlugin_InitStop_Warn.stderr
• testsuite/tests/tcplugins/all.T
• + testsuite/tests/tcplugins/tc-plugin-initstop/Makefile
• + testsuite/tests/tcplugins/tc-plugin-initstop/Setup.hs
• + testsuite/tests/tcplugins/tc-plugin-initstop/TcPlugin_InitStop_Plugin.hs
• + testsuite/tests/tcplugins/tc-plugin-initstop/tc-plugin-initstop.cabal
• testsuite/tests/th/T24111.stdout
• + testsuite/tests/th/T27022.hs
• + testsuite/tests/th/T27022.stdout
• testsuite/tests/th/all.T
• testsuite/tests/typecheck/should_compile/T13032.stderr
• + testsuite/tests/typecheck/should_compile/T23135.hs
• testsuite/tests/typecheck/should_compile/all.T
• testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr
• testsuite/tests/typecheck/should_fail/T21130.stderr
• + testsuite/tests/typecheck/should_fail/T27210.hs
• + testsuite/tests/typecheck/should_fail/T27210.stderr
• testsuite/tests/typecheck/should_fail/all.T
• testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs
• utils/check-exact/ExactPrint.hs
• utils/check-exact/Main.hs
• utils/ghc-pkg/Main.hs
• utils/ghc-toolchain/exe/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Program.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.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/AttachInstances.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/jsffi/prelude.mjs

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