Cheng Shao pushed to branch wip/batch-loaddll at Glasgow Haskell Compiler / GHC

Commits:

• 5b5d9d47
  by Ben Gamari at 2025-08-25T14:29:35-04:00

  Revert "STM: don't create a transaction in the rhs of catchRetry# (#26028)"
  
  This reverts commit 0a5836891ca29836a24c306d2a364c2e4b5377fd

• 10f06163
  by Cheng Shao at 2025-08-25T14:30:16-04:00

  wasm: ensure setKeepCAFs() is called in ghci
  
  This patch is a critical bugfix for #26106, see comment and linked
  issue for details.
  

• bedc1004
  by Cheng Shao at 2025-08-26T09:31:18-04:00

  compiler: use zero cost coerce in hoopl setElems/mapToList
  
  This patch is a follow-up of !14680 and changes setElems/mapToList in
  GHC/Cmm/Dataflow/Label to use coerce instead of mapping mkHooplLabel
  over the keys.
  

• 13250d97
  by Ryan Scott at 2025-08-26T09:31:59-04:00

  Reject infix promoted data constructors without DataKinds
  
  In the rename, make sure to apply the same `DataKinds` checks for both
  `HsTyVar` (for prefix promoted data constructors) and `HsOpTy` (for infix
  promoted data constructors) alike.
  
  Fixes #26318.
  

• 37655c46
  by Teo Camarasu at 2025-08-26T15:24:51-04:00

  tests: disable T22859 under LLVM
  
  This test was failing under the LLVM backend since the allocations
  differ from the NCG.
  
  Resolves #26282
  

• 2cbba9d6
  by Teo Camarasu at 2025-08-26T15:25:33-04:00

  base-exports: update version numbers
  
  As the version of the compiler has been bumped, a lot of the embedded
  version numbers will need to be updated if we ever run this test with
  `--test-accept` so let's just update them now, and keep future diffs
  clean.
  

• f9f2ffcf
  by Alexandre Esteves at 2025-08-27T07:19:14-04:00

  Import new name for 'utimbuf' on windows to fix #26337
  
  Fixes an `-Wincompatible-pointer-types` instance that turns into an error on
  recent toolchains and surfaced as such on nixpkgs when doing linux->ucrt cross.
  
  This long-standing warning has been present at least since 9.4:
  
  ```
  C:\GitLabRunner\builds\0\1709189\tmp\ghc16652_0\ghc_4.c:26:115: error:
       warning: incompatible pointer types passing 'struct utimbuf *' to parameter of type 'struct _utimbuf *' [-Wincompatible-pointer-types]
     |
  26 | HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}
  
     |                                                                                                                   ^
  HsInt32 ghczuwrapperZC9ZCbaseZCSystemziPosixziInternalsZCzuutime(char* a1, struct utimbuf* a2) {return _utime(a1, a2);}
                                                                                                                    ^~
  
  C:\GitLabRunner\builds\0\1709189\_build\stage0\lib\..\..\mingw\x86_64-w64-mingw32\include\sys\utime.h:109:72: error:
       note: passing argument to parameter '_Utimbuf' here
      |
  109 | __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
      |                                                                        ^
  __CRT_INLINE int __cdecl _utime(const char *_Filename,struct _utimbuf *_Utimbuf) {
  ```
  

• ae89f000
  by Hassan Al-Awwadi at 2025-08-27T07:19:56-04:00

  Adds the fucnction addDependentDirectory to Q, resolving issue #26148.
  
  This function adds a new directory to the list of things a module depends upon. That means that when the contents of the directory change, the recompilation checker will notice this and the module will be recompiled. Documentation has also been added for addDependentFunction and addDependentDirectory in the user guide.
  

• 00478944
  by Simon Peyton Jones at 2025-08-27T16:48:30+01:00

  Comments only
  

• a7884589
  by Simon Peyton Jones at 2025-08-28T11:08:23+01:00

  Type-family occurs check in unification
  
  The occurs check in `GHC.Core.Unify.uVarOrFam` was inadequate in dealing
  with type families.
  
  Better now.  See Note [The occurs check in the Core unifier].
  
  As I did this I realised that the whole apartness thing is trickier than I
  thought: see the new Note [Shortcomings of the apartness test]
  

• 8adfc222
  by sheaf at 2025-08-28T19:47:17-04:00

  Fix orientation in HsWrapper composition (<.>)
  
  This commit fixes the order in which WpCast HsWrappers are composed,
  fixing a bug introduced in commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1.
  
  Fixes #26350
  

• eb2ab1e2
  by Oleg Grenrus at 2025-08-29T11:00:53-04:00

  Generalise thNameToGhcName by adding HasHscEnv
  
  There were multiple single monad-specific `getHscEnv` across codebase.
  HasHscEnv is modelled on HasDynFlags.
  
  My first idea was to simply add thNameToGhcNameHsc and
  thNameToGhcNameTc, but those would been exactly the same
  as thNameToGhcName already.
  
  Also add an usage example to thNameToGhcName and mention that it's
  recommended way of looking up names in GHC plugins
  

• 2d575a7f
  by fendor at 2025-08-29T11:01:36-04:00

  configure: Bump minimal bootstrap GHC version to 9.10
  

• 716274a5
  by Simon Peyton Jones at 2025-08-29T17:27:12-04:00

  Fix deep subsumption again
  
  This commit fixed #26255:
  
      commit 56b32c5a2d5d7cad89a12f4d74dc940e086069d1
      Author: sheaf <sam.derbyshire@gmail.com>
      Date:   Mon Aug 11 15:50:47 2025 +0200
  
          Improve deep subsumption
  
          This commit improves the DeepSubsumption sub-typing implementation
          in GHC.Tc.Utils.Unify.tc_sub_type_deep by being less eager to fall back
          to unification.
  
  But alas it still wasn't quite right for view patterns: #26331
  
  This MR does a generalisation to fix it.  A bit of a sledgehammer to crack
  a nut, but nice.
  
  * Add a field `ir_inst :: InferInstFlag` to `InferResult`, where
    ```
    data InferInstFlag = IIF_Sigma | IIF_ShallowRho | IIF_DeepRho
    ```
  
  * The flag says exactly how much `fillInferResult` should instantiate
    before filling the hole.
  
  * We can also use this to replace the previous very ad-hoc `tcInferSigma`
    that was used to implement GHCi's `:type` command.
  

• 27206c5e
  by sheaf at 2025-08-29T17:28:14-04:00

  Back-compat for TH SpecialiseP data-con of Pragma
  
  This commit improves the backwards-compatibility story for the
  SpecialiseP constructor of the Template Haskell 'Pragma' datatype.
  
  Instead of keeping the constructor but deprecating it, this commit makes
  it into a bundled pattern synonym of the Pragma datatype. We no longer
  deprecate it; it's useful for handling old-form specialise pragmas.
  

• 26dbcf61
  by fendor at 2025-08-30T05:10:08-04:00

  Move stack decoding logic from ghc-heap to ghc-internal
  
  The stack decoding logic in `ghc-heap` is more sophisticated than the one
  currently employed in `CloneStack`. We want to use the stack decoding
  implementation from `ghc-heap` in `base`.
  We cannot simply depend on `ghc-heap` in `base` due do bootstrapping
  issues.
  Thus, we move the code that is necessary to implement stack decoding to
  `ghc-internal`. This is the right location, as we don't want to add a
  new API to `base`.
  
  Moving the stack decoding logic and re-exposing it in ghc-heap is
  insufficient, though, as we have a dependency cycle between.
  
  * ghc-heap depends on stage1:ghc-internal
  * stage0:ghc depends on stage0:ghc-heap
  
  To fix this, we remove ghc-heap from the set of `stage0` dependencies.
  
  This is not entirely straight-forward, as a couple of boot dependencies,
  such as `ghci` depend on `ghc-heap`.
  Luckily, the boot compiler of GHC is now >=9.10, so we can migrate `ghci`
  to use `ghc-internal` instead of `ghc-heap`, which already exports the
  relevant modules.
  
  However, we cannot 100% remove ghc's dependency on `ghc-heap`, since
  when we compile `stage0:ghc`, `stage1:ghc-internal` is not yet
  available.
  Thus, when we compile with the boot-compiler, we still depend on an
  older version of `ghc-heap`, and only use the modules from `ghc-internal`,
  if the `ghc-internal` version is recent enough.
  
  -------------------------
  Metric Increase:
      T24602_perf_size
      T25046_perf_size_gzip
      T25046_perf_size_unicode
      T25046_perf_size_unicode_gzip
      size_hello_artifact
      size_hello_artifact_gzip
      size_hello_unicode
      size_hello_unicode_gzip
  -------------------------
  
  These metric increases are unfortunate, they are most likely caused by
  the larger (literally in terms of lines of code) stack decoder implementation
  that are now linked into hello-word binaries.
  
  On linux, it is almost a 10% increase, which is considerable.
  

• bd80bb70
  by fendor at 2025-08-30T05:10:08-04:00

  Implement `decode` in terms of `decodeStackWithIpe`
  
  Uses the more efficient stack decoder implementation.
  

• 24441165
  by fendor at 2025-08-30T05:10:08-04:00

  Remove stg_decodeStackzh
  

• fb9cc882
  by Simon Peyton Jones at 2025-08-30T05:10:51-04:00

  Fix a long standing bug in the coercion optimiser
  
  We were mis-optimising ForAllCo, leading to #26345
  
  Part of the poblem was the tricky tower of abstractions leading to
  the dreadful
     GHC.Core.TyCo.Subst.substForAllCoTyVarBndrUsing
  This function was serving two masters: regular substitution, but also
  coercion optimsation.  So tricky was it that it did so wrong.
  
  In this MR I locate all the fancy footwork for coercion optimisation
  in GHC.Core.Coercion.Opt, where it belongs.   That leaves substitution
  free to be much simpler.
  

• 6c78de2d
  by Sylvain Henry at 2025-09-01T08:46:19-04:00

  Driver: substitute virtual Prim module in --make mode too
  
  When we build ghc-internal with --make (e.g. with cabal-install), we
  need to be careful to substitute the virtual interface file for
  GHC.Internal.Prim:
  - after code generation (we generate code for an empty module, so we get
    an empty interface)
  - when we try to reload its .hi file
  

• 26e0db16
  by fendor at 2025-09-01T08:47:01-04:00

  Expose Stack Annotation frames in IPE backtraces by default
  
  When decoding the Haskell-native call stack and displaying the IPE information
  for the stack frames, we print the `StackAnnotation` of the `AnnFrame` by default.
  
  This means, when an exception is thrown, any intermediate stack annotations will
  be displayed in the `IPE Backtrace`.
  
  Example backtrace:
  ```
  Exception: ghc-internal:GHC.Internal.Exception.ErrorCall:
  
  Oh no!
  
  IPE backtrace:
    annotateCallStackIO, called at app/Main.hs:48:10 in backtrace-0.1.0.0-inplace-server:Main
    annotateCallStackIO, called at app/Main.hs:46:13 in backtrace-0.1.0.0-inplace-server:Main
    Main.handler (app/Main.hs:(46,1)-(49,30))
    Main.liftIO (src/Servant/Server/Internal/Handler.hs:30:36-42)
    Servant.Server.Internal.Delayed.runHandler' (src/Servant/Server/Internal/Handler.hs:27:31-41)
    Control.Monad.Trans.Resource.runResourceT (./Control/Monad/Trans/Resource.hs:(192,14)-(197,18))
    Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:195:20-22)
    Network.Wai.Handler.Warp.HTTP1.processRequest (./Network/Wai/Handler/Warp/HTTP1.hs:(195,5)-(203,31))
    Network.Wai.Handler.Warp.HTTP1.http1server.loop (./Network/Wai/Handler/Warp/HTTP1.hs:(141,9)-(157,42))
  HasCallStack backtrace:
    error, called at app/Main.hs:48:32 in backtrace-0.1.0.0-inplace-server:Main
  ```
  
  The first two entries have been added by `annotateCallStackIO`, defined in `annotateCallStackIO`.
  

• a1567efd
  by Sylvain Henry at 2025-09-01T23:01:35-04:00

  RTS: rely less on Hadrian for flag setting (#25843)
  
  Hadrian used to pass -Dfoo command-line flags directly to build the rts.
  We can replace most of these flags with CPP based on cabal flags.
  It makes building boot libraries with cabal-install simpler (cf #25843).
  

• ca5b0283
  by Sergey Vinokurov at 2025-09-01T23:02:23-04:00

  Remove unnecessary irrefutable patterns from Bifunctor instances for tuples
  
  Implementation of https://github.com/haskell/core-libraries-committee/issues/339
  
  Metric Decrease:
      mhu-perf
  

• 2da84b7a
  by sheaf at 2025-09-01T23:03:23-04:00

  Only use active rules when simplifying rule RHSs
  
  When we are simplifying the RHS of a rule, we make sure to only apply
  rewrites from rules that are active throughout the original rule's
  range of active phases.
  
  For example, if a rule is always active, we only fire rules that are
  themselves always active when simplifying the RHS. Ditto for inline
  activations.
  
  This is achieved by setting the simplifier phase to a range of phases,
  using the new SimplPhaseRange constructor. Then:
  
    1. When simplifying the RHS of a rule, or of a stable unfolding,
       we set the simplifier phase to a range of phases, computed from
       the activation of the RULE/unfolding activation, using the
       function 'phaseFromActivation'.
  
       The details are explained in Note [What is active in the RHS of a RULE?]
       in GHC.Core.Opt.Simplify.Utils.
  
    2. The activation check for other rules and inlinings is then:
       does the activation of the other rule/inlining cover the whole
       phase range set in sm_phase? This continues to use the 'isActive'
       function, which now accounts for phase ranges.
  
  On the way, this commit also moves the exact-print SourceText annotation
  from the Activation datatype to the ActivationAnn type. This keeps the
  main Activation datatype free of any extra cruft.
  
  Fixes #26323
  

• 79816cc4
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  cleanup: Move dehydrateCgBreakInfo to Stg2Bc
  
  This no longer has anything to do with Core.
  

• 53da94ff
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  rts/Disassembler: Fix spacing of BRK_FUN
  

• 08c0cf85
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  debugger: Fix bciPtr in Step-out
  
  We need to use `BCO_NEXT` to move bciPtr to ix=1, because ix=0 points to
  the instruction itself!
  
  I do not understand how this didn't crash before.
  

• e7e021fa
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  debugger: Allow BRK_FUNs to head case continuation BCOs
  
  When we start executing a BCO, we may want to yield to the scheduler:
  this may be triggered by a heap/stack check, context switch, or a
  breakpoint. To yield, we need to put the stack in a state such that
  when execution is resumed we are back to where we yielded from.
  
  Previously, a BKR_FUN could only head a function BCO because we only
  knew how to construct a valid stack for yielding from one -- simply add
  `apply_interp_info` + the BCO to resume executing. This is valid because
  the stack at the start of run_BCO is headed by that BCO's arguments.
  
  However, in case continuation BCOs (as per Note [Case continuation BCOs]),
  we couldn't easily reconstruct a valid stack that could be resumed
  because we dropped too soon the stack frames regarding the value
  returned (stg_ret) and received (stg_ctoi) by that continuation.
  This is especially tricky because of the variable type and size return
  frames (e.g. pointer ret_p/ctoi_R1p vs a tuple ret_t/ctoi_t2).
  
  The trick to being able to yield from a BRK_FUN at the start of a case
  cont BCO is to stop removing the ret frame headers eagerly and instead
  keep them until the BCO starts executing. The new layout at the start of
  a case cont. BCO is described by the new Note [Stack layout when entering run_BCO].
  
  Now, we keep the ret_* and ctoi_* frames when entering run_BCO.
  A BRK_FUN is then executed if found, and the stack is yielded as-is with
  the preserved ret and ctoi frames.
  Then, a case cont BCO's instructions always SLIDE off the headers of the
  ret and ctoi frames, in StgToByteCode.doCase, turning a stack like
  
     |     ....      |
     +---------------+
     |     fv2       |
     +---------------+
     |     fv1       |
     +---------------+
     |     BCO       |
     +---------------+
     | stg_ctoi_ret_ |
     +---------------+
     |    retval     |
     +---------------+
     | stg_ret_..... |
     +---------------+
  
  into
  
     |     ....      |
     +---------------+
     |     fv2       |
     +---------------+
     |     fv1       |
     +---------------+
     |    retval     |
     +---------------+
  
  for the remainder of the BCO.
  
  Moreover, this more uniform approach of keeping the ret and ctoi frames
  means we need less ad-hoc logic concerning the variable size of
  ret_tuple vs ret_p/np frames in the code generator and interpreter:
  Always keep the return to cont. stack intact at the start of run_BCO,
  and the statically generated instructions will take care of adjusting
  it.
  
  Unlocks BRK_FUNs at the start of case cont. BCOs which will enable a
  better user-facing step-out (#26042) which is free of the bugs the
  current BRK_ALTS implementation suffers from (namely, using BRK_FUN
  rather than BRK_ALTS in a case cont. means we'll never accidentally end
  up in a breakpoint "deeper" than the continuation, because we stop at
  the case cont itself rather than on the first breakpoint we evaluate
  after it).
  

• ade3c1e6
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  BRK_FUN with InternalBreakLocs for code-generation time breakpoints
  
  At the start of a case continuation BCO, place a BRK_FUN.
  This BRK_FUN uses the new "internal breakpoint location" -- allowing us
  to come up with a valid source location for this breakpoint that is not associated with a source-level tick.
  
  For case continuation BCOs, we use the last tick seen before it as the
  source location. The reasoning is described in Note [Debugger: Stepout internal break locs].
  
  Note how T26042c, which was broken because it displayed the incorrect
  behavior of the previous step out when we'd end up at a deeper level
  than the one from which we initiated step-out, is now fixed.
  
  As of this commit, BRK_ALTS is now dead code and is thus dropped.
  
  Note [Debugger: Stepout internal break locs]
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Step-out tells the interpreter to run until the current function
  returns to where it was called from, and stop there.
  
  This is achieved by enabling the BRK_FUN found on the first RET_BCO
  frame on the stack (See [Note Debugger: Step-out]).
  
  Case continuation BCOs (which select an alternative branch) must
  therefore be headed by a BRK_FUN. An example:
  
      f x = case g x of <--- end up here
          1 -> ...
          2 -> ...
  
      g y = ... <--- step out from here
  
  - `g` will return a value to the case continuation BCO in `f`
  - The case continuation BCO will receive the value returned from g
  - Match on it and push the alternative continuation for that branch
  - And then enter that alternative.
  
  If we step-out of `g`, the first RET_BCO on the stack is the case
  continuation of `f` -- execution should stop at its start, before
  selecting an alternative. (One might ask, "why not enable the breakpoint
  in the alternative instead?", because the alternative continuation is
  only pushed to the stack *after* it is selected by the case cont. BCO)
  
  However, the case cont. BCO is not associated with any source-level
  tick, it is merely the glue code which selects alternatives which do
  have source level ticks. Therefore, we have to come up at code
  generation time with a breakpoint location ('InternalBreakLoc') to
  display to the user when it is stopped there.
  
  Our solution is to use the last tick seen just before reaching the case
  continuation. This is robust because a case continuation will thus
  always have a relevant breakpoint location:
  
      - The source location will be the last source-relevant expression
        executed before the continuation is pushed
  
      - So the source location will point to the thing you've just stepped
        out of
  
      - Doing :step-local from there will put you on the selected
        alternative (which at the source level may also be the e.g. next
        line in a do-block)
  
  Examples, using angle brackets (<<...>>) to denote the breakpoint span:
  
      f x = case <<g x>> {- step in here -} of
          1 -> ...
          2 -> ...>
  
      g y = <<...>> <--- step out from here
  
      ...
  
      f x = <<case g x of <--- end up here, whole case highlighted
          1 -> ...
          2 -> ...>>
  
      doing :step-local ...
  
      f x = case g x of
          1 -> <<...>> <--- stop in the alternative
          2 -> ...
  
  A second example based on T26042d2, where the source is a do-block IO
  action, optimised to a chain of `case expressions`.
  
      main = do
        putStrLn "hello1"
        <<f>> <--- step-in here
        putStrLn "hello3"
        putStrLn "hello4"
  
      f = do
        <<putStrLn "hello2.1">> <--- step-out from here
        putStrLn "hello2.2"
  
      ...
  
      main = do
        putStrLn "hello1"
        <<f>> <--- end up here again, the previously executed expression
        putStrLn "hello3"
        putStrLn "hello4"
  
      doing step/step-local ...
  
      main = do
        putStrLn "hello1"
        f
        <<putStrLn "hello3">> <--- straight to the next line
        putStrLn "hello4"
  
  Finishes #26042
  

• c66910c0
  by Rodrigo Mesquita at 2025-09-02T12:19:59-04:00

  debugger: Re-use the last BreakpointId whole in step-out
  
  Previously, to come up with a location to stop at for `:stepout`, we
  would store the location of the last BreakpointId surrounding the
  continuation, as described by Note [Debugger: Stepout internal break locs].
  
  However, re-using just the location from the last source breakpoint
  isn't sufficient to provide the necessary information in the break
  location. Specifically, it wouldn't bind any variables at that location.
  
  Really, there is no reason not to re-use the last breakpoint wholesale,
  and re-use all the information we had there. Step-out should behave just
  as if we had stopped at the call, but s.t. continuing will not
  re-execute the call.
  
  This commit updates the CgBreakInfo to always store a BreakpointId, be
  it the original one or the one we're emulating (for step-out).
  
  It makes variable bindings on :stepout work
  

• e4abed7b
  by sheaf at 2025-09-02T12:20:40-04:00

  Revert accidental changes to hie.yaml

• 003b715b
  by meooow25 at 2025-09-02T23:48:51+02:00

  Adjust the strictness of Data.List.iterate'
  
  * Don't force the next element in advance when generating a (:).
  * Force the first element to WHNF like every other element.
  
  Now every element in the output list is forced to WHNF when the (:)
  containing it is forced.
  
  CLC proposal:
  https://github.com/haskell/core-libraries-committee/issues/335
  

• b2f6aad0
  by Simon Hengel at 2025-09-03T04:36:10-04:00

  Refactoring: More consistently use logOutput, logInfo, fatalErrorMsg
  

• 60a16db7
  by Rodrigo Mesquita at 2025-09-03T10:55:50+01:00

  bytecode: Don't PUSH_L 0; SLIDE 1 1
  
  While looking through bytecode I noticed a quite common unfortunate
  pattern:
  
  ...
  PUSH_L 0
  SLIDE 1 1
  
  We do this often by generically constructing a tail call from a function
  atom that may be somewhere arbitrary on the stack.
  However, for the special case that the function can be found directly on
  top of the stack, as part of the arguments, it's plain redundant to push
  then slide it.
  
  In this commit we add a small optimisation to the generation of
  tailcalls in bytecode. Simply: lookahead for the function in the stack.
  If it is the first thing on the stack and it is part of the arguments
  which would be dropped as we entered the tail call, then don't push then
  slide it.
  
  In a simple example (T26042b), this already produced a drastic
  improvement in generated code (left is old, right is with this patch):
  
  ```diff
  3c3
  < 2025-07-29 10:14:02.081277 UTC
  ---
  > 2025-07-29 10:50:36.560949 UTC
  160,161c160
  <                                            PUSH_L   0
  <                                            SLIDE    1 2
  ---
  >                                            SLIDE    1 1
  164,165d162
  <                                       PUSH_L   0
  <                                       SLIDE    1 1
  175,176c172
  <                             PUSH_L   0
  <                             SLIDE    1 2
  ---
  >                             SLIDE    1 1
  179,180d174
  <                        PUSH_L   0
  <                        SLIDE    1 1
  206,207d199
  <                        PUSH_L   0
  <                        SLIDE    1 1
  210,211d201
  <                   PUSH_L   0
  <                   SLIDE    1 1
  214,215d203
  <              PUSH_L   0
  <              SLIDE    1 1
  218,219d205
  <         PUSH_L   0
  <         SLIDE    1 1
  222,223d207
  <    PUSH_L   0
  <    SLIDE    1 1
  ...
  600,601c566
  <                                                 PUSH_L   0
  <                                                 SLIDE    1 2
  ---
  >                                                 SLIDE    1 1
  604,605d568
  <                                            PUSH_L   0
  <                                            SLIDE    1 1
  632,633d594
  <                                            PUSH_L   0
  <                                            SLIDE    1 1
  636,637d596
  <                                       PUSH_L   0
  <                                       SLIDE    1 1
  640,641d598
  <                                  PUSH_L   0
  <                                  SLIDE    1 1
  644,645d600
  <                             PUSH_L   0
  <                             SLIDE    1 1
  648,649d602
  <                        PUSH_L   0
  <                        SLIDE    1 1
  652,653d604
  <                   PUSH_L   0
  <                   SLIDE    1 1
  656,657d606
  <              PUSH_L   0
  <              SLIDE    1 1
  660,661d608
  <         PUSH_L   0
  <         SLIDE    1 1
  664,665d610
  <    PUSH_L   0
  <    SLIDE    1 1
  ```
  
  I also compiled lib:Cabal to bytecode and counted the number of bytecode
  lines with `find dist-newstyle -name "*.dump-BCOs" -exec wc {} +`:
  
      with unoptimized core:
      1190689 lines (before) - 1172891 lines (now)
      = 17798 less redundant instructions (-1.5% lines)
  
      with optimized core:
      1924818 lines (before) - 1864836 lines (now)
      = 59982 less redundant instructions (-3.1% lines)
  

• 8b2c72c0
  by L0neGamer at 2025-09-04T06:32:03-04:00

  Add Control.Monad.thenM and Control.Applicative.thenA
  

• 39e1b7cb
  by Teo Camarasu at 2025-09-04T06:32:46-04:00

  ghc-internal: invert dependency of GHC.Internal.TH.Syntax on Data.Data
  
  This means that Data.Data no longer blocks building TH.Syntax, which
  allows greater parallelism in our builds.
  
  We move the Data.Data.Data instances to Data.Data. Quasi depends on
  Data.Data for one of its methods, so,
  we split the Quasi/Q, etc definition out of GHC.Internal.TH.Syntax
  into its own module. This has the added benefit of splitting up this
  quite large module.
  
  Previously TH.Syntax was a bottleneck when compiling ghc-internal. Now
  it is less of a bottle-neck and is also slightly quicker to
  compile (since it no longer contains these instances) at the cost of
  making Data.Data slightly more expensive to compile.
  TH.Lift which depends on TH.Syntax can also compile quicker and no
  longer blocks ghc-internal finishing to compile.
  
  Resolves #26217
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_OneShot
      T13253
      T21839c
      T24471
  Metric Increase:
      T12227
  -------------------------
  

• bdf82fd2
  by Teo Camarasu at 2025-09-04T06:32:46-04:00

  compiler: delete unused names in Builtins.Names.TH
  
  returnQ and bindQ are no longer used in the compiler.
  There was also a very old comment that referred to them that I have modernized
  

• 41a448e5
  by Ben Gamari at 2025-09-04T19:21:43-04:00

  hadrian: Pass lib & include directories to ghc `Setup configure`
  

• 46bb9a79
  by Ben Gamari at 2025-09-04T19:21:44-04:00

  rts/IPE: Fix compilation when zstd is enabled
  
  This was broken by the refactoring undertaken in
  c80dd91c0bf6ac034f0c592f16c548b9408a8481.
  
  Closes #26312.
  

• 138a6e34
  by sheaf at 2025-09-04T19:22:46-04:00

  Make mkCast assertion a bit clearer
  
  This commit changes the assertion message that gets printed when one
  calls mkCast with a coercion whose kind does not match the type of the
  inner expression. I always found the assertion message a bit confusing,
  as it didn't clearly state what exactly was the error.
  

• 9d626be1
  by sheaf at 2025-09-04T19:22:46-04:00

  Simplifier/rules: fix mistakes in Notes & comments
  

• 94b62aa7
  by Simon Peyton Jones at 2025-09-08T03:37:14-04:00

  Refactor ForAllCo
  
  This is a pure refactor, addressing #26389.
  
  It arranges that the kind coercion in a ForAllCo is a MCoercion, rather
  than a plain Coercion, thus removing redundancy in the common case.
  See (FC8) in Note [ForAllCo]
  
  It's a nice cleanup.
  

• 624afa4a
  by sheaf at 2025-09-08T03:38:05-04:00

  Use tcMkScaledFunTys in matchExpectedFunTys
  
  We should use tcMkScaledFunTys rather than mkScaledFunTys in
  GHC.Tc.Utils.Unify.matchExpectedFunTys, as the latter crashes
  when the kind of the result type is a bare metavariable.
  We know the result is always Type-like, so we don't need scaledFunTys
  to try to rediscover that from the kind.
  
  Fixes #26277
  

• 0975d2b6
  by sheaf at 2025-09-08T03:38:54-04:00

  Revert "Remove hptAllFamInstances usage during upsweep"
  
  This reverts commit 3bf6720eff5e86e673568e756161e6d6150eb440.
  

• 0cf34176
  by soulomoon at 2025-09-08T03:38:54-04:00

  Family consistency checks: add test for #26154
  
  This commit adds the test T26154, to make sure that GHC doesn't crash
  when performing type family consistency checks. This test case
  was extracted from Agda.
  
  Fixes #26154
  

• ba210d98
  by Simon Peyton Jones at 2025-09-08T16:26:36+01:00

  Report solid equality errors before custom errors
  
  This MR fixes #26255 by
  
  * Reporting solid equality errors like
       Int ~ Bool
    before "custom type errors".  See comments in `report1` in
    `reportWanteds`
  
  * Suppressing errors that arise from superclasses of
    Wanteds.  See (SCE1) in Note [Suppressing confusing errors]
  
  More details in #26255.
  

• b6249140
  by Simon Peyton Jones at 2025-09-10T10:42:38-04:00

  Fix a scoping error in Specialise
  
  This small patch fixes #26329, which triggered a scoping error.
  
  Test is in T21391, with -fpolymorphic-specialisation enabled
  

• 45305ab8
  by sheaf at 2025-09-10T10:43:29-04:00

  Make rationalTo{Float,Double} inline in phase 0
  
  We hold off on inlining these until phase 0 to allow constant-folding
  rules to fire. However, once we get to phase 0, we should inline them,
  e.g. to expose unboxing opportunities.
  
  See CLC proposal #356.
  

• 0959d4bc
  by Andreas Klebinger at 2025-09-10T10:44:12-04:00

  Add regression test for #26056
  

• dc79593d
  by sheaf at 2025-09-10T10:45:01-04:00

  Deep subsumption: unify mults without tcEqMult
  
  As seen in #26332, we may well end up with a non-reflexive multiplicity
  coercion when doing deep subsumption. We should do the same thing that
  we do without deep subsumption: unify the multiplicities normally,
  without requiring that the coercion is reflexive (which is what
  'tcEqMult' was doing).
  
  Fixes #26332
  

• 4bfe2269
  by sheaf at 2025-09-10T10:45:50-04:00

  lint-codes: fixup MSYS drive letter on Windows
  
  This change ensures that System.Directory.listDirectory doesn't trip up
  on an MSYS-style path like '/c/Foo' when trying to list all testsuite
  stdout/stderr files as required for testing coverage of GHC diagnostic
  codes in the testsuite.
  
  Fixes #25178
  

• 56540775
  by Ben Gamari at 2025-09-10T10:46:32-04:00

  gitlab-ci: Disable split sections on FreeBSD
  
  Due to #26303.
  

• 1537784b
  by Moritz Angermann at 2025-09-10T10:47:13-04:00

  Improve mach-o relocation information
  
  This change adds more information about the symbol and addresses
  we try to relocate in the linker.  This significantly helps when
  deubbging relocation issues reported by users.
  

• 4e67855b
  by Moritz Angermann at 2025-09-10T10:47:54-04:00

  test.mk expect GhcLeadingUnderscore, not LeadingUnderscore (in line with the other Ghc prefixed variables.
  

• c1cdd265
  by Moritz Angermann at 2025-09-10T10:48:35-04:00

  testsuite: Fix broken exec_signals_child.c
  
  There is no signal 0. The signal mask is 1-32.
  

• 99ac335c
  by Moritz Angermann at 2025-09-10T10:49:15-04:00

  testsuite: clarify Windows/Darwin locale rationale for skipping T6037 T2507 T8959a
  

• 0e8fa77a
  by Moritz Angermann at 2025-09-10T10:49:56-04:00

  Skip broken tests on macOS (due to leading underscore not handled properly in the expected output.)
  

• 28570c59
  by Zubin Duggal at 2025-09-10T10:50:37-04:00

  docs(sphinx): fix links to reverse flags when using the :ghc-flag:`-fno-<flag>` syntax
  
  This solution is rather hacky and I suspect there is a better way to do this but I don't know
  enough about Sphinx to do better.
  
  Fixes #26352
  

• d17257ed
  by Cheng Shao at 2025-09-10T17:01:27+02:00

  rel-eng: update alpine images to 3.22
  
  This patch is a part of #25876 and updates alpine images to 3.22,
  while still retaining 3.12 for x86_64 fully_static bindists.
  
  -------------------------
  Metric Decrease:
      MultiComponentModulesRecomp
  -------------------------
  

• db3276bb
  by Sylvain Henry at 2025-09-11T11:27:28-04:00

  T16180: indicate that the stack isn't executable
  

• 11eeeba7
  by Sylvain Henry at 2025-09-11T11:27:28-04:00

  Fix some tests (statically linked GHC vs libc)
  
  When GHC is linked statically, the stdout C global variable that GHC uses
  isn't shared with the stdout C global variable used by loaded code.
  
  As a consequence, the latter must be explicitly flushed because GHC
  won't flush it before exiting.
  

• 80a07571
  by Sylvain Henry at 2025-09-11T11:28:18-04:00

  Testsuite: fix debug_rts detection
  
  Running the testsuite without Hadrian should set config.debug_rts
  correctly too.
  

• 62ae97de
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Handle heap allocation failure in I/O primops
  
  The current I/O managers do not use allocateMightFail, but future ones
  will. To support this properly we need to be able to return to the
  primop with a failure. We simply use a bool return value.
  
  Currently however, we will just throw an exception rather than calling
  the GC because that's what all the other primops do too.
  
  For the general issue of primops invoking GC and retrying, see
  https://gitlab.haskell.org/ghc/ghc/-/issues/24105
  

• cb9093f5
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Move (and rename) scheduleStartSignalHandlers into RtsSignals.h
  
  Previously it was a local helper (static) function in Schedule.c.
  
  Rename it to startPendingSignalHandlers and deifine it as an inline
  header function in RtsSignals.h. So it should still be fast.
  
  Each (new style) I/O manager is going to need to do the same, so eliminating
  the duplication now makes sense.
  

• 9736d44a
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Reduce detail in printThreadBlockage I/O blocking cases
  
  The printThreadBlockage is used in debug tracing output.
  For the cases BlockedOn{Read,Write,Delay} the output previously included
  the fd that was being waited on, and the delay target wake time.
  
  Superficially this sounds useful, but it's clearly not that useful
  because it was already wrong for the Win32 non-threaded I/O manager. In
  that situation it will print garbage (the async_result pointer, cast to
  a fd or a time).
  
  So given that it apparently never mattered that the information was
  accurate, then it's hardly a big jump to say it doesn't matter if it is
  present at all.
  
  A good reason to remove it is that otherwise we have to make a new
  API and a per-I/O manager implementation to fetch the information. And
  for some I/O manager implementations, this information is not available.
  It is not available in the win32 non-threaded I/O manager. And for some
  future Linux ones, there is no need for the fd to be stored, so storing
  it would be just extra space used for very little gain.
  
  So the simplest thing is to just remove the detail.
  

• bc0f2d5d
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add TimeoutQueue.{c,h} and corresponding tests
  
  A data structure used to efficiently manage a collection of timeouts.
  
  It is a priority queue based on absolute expiry time. It uses 64bit
  high-precision Time for the keys. The values are normal closures which
  allows for example using MVars for unblocking.
  
  It is common in many applications for timeouts to be created and then
  deleted or altered before they expire. Thus the choice of data structure
  for timeouts should support this efficiently. The implementation choice
  here is a leftist heap with the extra feature that it supports deleting
  arbitrary elements, provided the caller retain a pointer to the element.
  While the deleteMin operation takes O(log n) time, as in all heap
  structures, the delete operation for arbitrary elements /typically/
  takes O(1), and only O(log n) in the worst case. In practice, when
  managing thousands of timeouts it can be a factor of 10 faster to delete
  a random timeout queue element than to remove the minimum element. This
  supports the common use case.
  
  The plan is to use it in some of the RTS-side I/O managers to support
  their timer functionality. In this use case the heap value will be an
  MVar used for each timeout to unblock waiting threads.
  

• d1679c9d
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add ClosureTable.{c,h} and corresponding tests
  
  A table of pointers to closures on the GC heap with stable indexes.
  
  It provides O(1) alloc, free and lookup. The table can be expanded
  using a simple doubling strategy: in which case allocation is typically
  O(1) and occasionally O(n) for overall amortised O(1). No shrinking is
  used.
  
  The table itself is heap allocated, and points to other heap objects.
  As such it's necessary to use markClosureTable to ensure the table is
  used as a GC root to keep the table entries alive, and maintain proper
  pointers to them as the GC moves heap objects about.
  
  It is designed to be allocated and accesses exclusively from a single
  capability, enabling it to work without any locking. It is thus similar
  to the StablePtr table, but per-capability which removes the need for
  locking. It _should_ also provide lower GC pause times with the
  non-moving GC by spending only O(1) time in markClosureTable, vs O(n)
  for markStablePtrTable.
  
  The plan is to use it in some of the I/O managers to keep track of
  in-flight I/O operations (but not timers). This allows the tracking
  info to be kept on the (unpinned) GC heap, and shared with Haskell
  code, and by putting a pointer to the tracking information in a table,
  the index remains stable and can be passed via foreign code (like the
  kernel).
  

• 78cb8dd5
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add the StgAsyncIOOp closure type
  
  This is intended to be used by multiple I/O managers to help with
  tracking in-flight I/O operations.
  
  It is called asynchronous because from the point of view of the RTS we
  have many such operations in progress at once. From the point of view of
  a Haskell thread of course it can look synchronous.
  

• a2839896
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add StgAsyncIOOp and StgTimeoutQueue to tso->block_info
  
  These will be used by new I/O managers, for threads blocked on I/O or
  timeouts.
  

• fdc2451c
  by Duncan Coutts at 2025-09-12T13:23:33-04:00

  Add a new I/O manager based on poll()
  
  This is a proof of concept I/O manager, to show how to add new ones
  neatly, using the ClosureTable and TimeoutQueue infrastructure.
  
  It uses the old unix poll() API, so it is of course limited in
  performance by that, but it should have the benefit of wide
  compatibility. Also we neatly avoid a name clash with the existing
  select() I/O manager.
  
  Compared to the select() I/O manager:
  1. beause it uses poll() it is not limited to 1024 file descriptors
     (but it's still O(n) so don't expect great performance);
  2. it should have much faster threadDelay (when using it in lots of
     threads at once) because it's based on the new TimeoutQueue which is
     O(log n) rather than O(n).
  
  Some of the code related to timers/timouts is put into a shared module
  rts/posix/Timeout.{h,c} since it is intended to be shared with other
  similar I/O managers.
  

• 6c273b76
  by Duncan Coutts at 2025-09-12T13:23:34-04:00

  Document the I/O managers in the user guide
  
  and note the new poll I/O manager in the release notes.
  

• 824fab74
  by Duncan Coutts at 2025-09-12T13:23:34-04:00

  Use the poll() I/O manager by default
  
  That is, for the non-threaded RTS, prefer the poll I/O manager over the
  legacy select() one, if both can be enabled.
  
  This patch is primarily for CI testing, so we should probably remove
  this patch before merging. We can change defaults later after wider
  testing and feedback.
  

• 39392532
  by Luite Stegeman at 2025-09-12T13:24:16-04:00

  Support larger unboxed sums
  
  Change known constructor encoding for sums in interfaces to use
  11 bits for both the arity and the alternative (up from 8 and 6,
  respectively)
  

• 2af12e21
  by Luite Stegeman at 2025-09-12T13:24:16-04:00

  Decompose padding smallest-first in Cmm toplevel data constructors
  
  This makes each individual padding value aligned
  

• 418fa78f
  by Luite Stegeman at 2025-09-12T13:24:16-04:00

  Use slots smaller than word as tag for smaller unboxed sums
  
  This packs unboxed sums more efficiently by allowing
  Word8, Word16 and Word32 for the tag field if the number of
  constructors is small enough
  

• 8d7e912f
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  ghc-toolchain: Use ByteOrder rather than new Endianness
  
  Don't introduce a duplicate datatype when the previous one is equivalent
  and already used elsewhere. This avoids unnecessary translation between
  the two.
  

• 7d378476
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  Read Toolchain.Target files rather than 'settings'
  
  This commit makes GHC read `lib/targets/default.target`, a file with a
  serialized value of `ghc-toolchain`'s `GHC.Toolchain.Target`.
  
  Moreover, it removes all the now-redundant entries from `lib/settings`
  that are configured as part of a `Target` but were being written into
  `settings`.
  
  This makes it easier to support multiple targets from the same compiler
  (aka runtime retargetability). `ghc-toolchain` can be re-run many times
  standalone to produce a `Target` description for different targets, and,
  in the future, GHC will be able to pick at runtime amongst different
  `Target` files.
  
  This commit only makes it read the default `Target` configured in-tree
  or configured when installing the bindist.
  
  The remaining bits of `settings` need to be moved to `Target` in follow
  up commits, but ultimately they all should be moved since they are
  per-target relevant.
  
  Fixes #24212
  
  On Windows, the constant overhead of parsing a slightly more complex
  data structure causes some small-allocation tests to wiggle around 1 to
  2 extra MB (1-2% in these cases).
  
  -------------------------
  Metric Increase:
      MultiLayerModulesTH_OneShot
      T10421
      T10547
      T12234
      T12425
      T13035
      T18140
      T18923
      T9198
      TcPlugin_RewritePerf
  -------------------------
  

• e0780a16
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  ghc-toolchain: Move TgtHasLibm to per-Target file
  
  TargetHasLibm is now part of the per-target configuration
  
  Towards #26227
  

• 8235dd8c
  by Rodrigo Mesquita at 2025-09-12T17:57:24-04:00

  ghc-toolchain: Move UseLibdw to per-Target file
  
  To support DWARF unwinding, the RTS must be built with the -f+libdw flag
  and with the -DUSE_LIBDW macro definition. These flags are passed on
  build by Hadrian when --enable-dwarf-unwinding is specified at configure
  time.
  
  Whether the RTS was built with support for DWARF is a per-target
  property, and as such, it was moved to the per-target
  GHC.Toolchain.Target.Target file.
  
  Additionally, we keep in the target file the include and library paths
  for finding libdw, since libdw should be checked at configure time (be
  it by configure, or ghc-toolchain, that libdw is properly available).
  
  Preserving the user-given include paths for libdw facilitates in the
  future building the RTS on demand for a given target (if we didn't keep
  that user input, we couldn't)
  
  Towards #26227
  

• d5ecf2e8
  by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00

  ghc-toolchain: Make "Support SMP" a query on a Toolchain.Target
  
  "Support SMP" is merely a function of target, so we can represent it as
  such in `ghc-toolchain`.
  
  Hadrian queries the Target using this predicate to determine how to
  build GHC, and GHC queries the Target similarly to report under --info
  whether it "Support SMP"
  
  Towards #26227
  

• e07b031a
  by Rodrigo Mesquita at 2025-09-12T17:57:25-04:00

  ghc-toolchain: Make "tgt rts linker only supports shared libs" function on Target
  
  Just like with "Support SMP", "target RTS linker only supports shared
  libraries" is a predicate on a `Target` so we can just compute it when
  necessary from the given `Target`.
  
  Towards #26227
  

• 14123ee6
  by Simon Peyton Jones at 2025-09-12T17:58:07-04:00

  Solve forall-constraints via an implication, again
  
  In this earlier commit:
  
    commit 953fd8f1dc080f1c56e3a60b4b7157456949be29
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Jul 21 10:06:43 2025 +0100
  
    Solve forall-constraints immediately, or not at all
  
  I used a all-or-nothing strategy for quantified constraints
  (aka forall-constraints).  But alas that fell foul of #26315,
  and #26376.
  
  So this MR goes back to solving a quantified constraint by
  turning it into an implication; UNLESS we are simplifying
  constraints from a SPECIALISE pragma, in which case the
  all-or-nothing strategy is great.  See:
  
     Note [Solving a Wanted forall-constraint]
  
  Other stuff in this MR:
  
  * TcSMode becomes a record of flags, rather than an enumeration
    type; much nicer.
  
  * Some fancy footwork to avoid error messages worsening again
    (The above MR made them better; we want to retain that.)
    See `GHC.Tc.Errors.Ppr.pprQCOriginExtra`.
  
  -------------------------
  Metric Decrease:
      T24471
  -------------------------
  

• e6c192e2
  by Simon Peyton Jones at 2025-09-12T17:58:07-04:00

  Add a test case for #26396
  
  ...same bug ast #26315
  

• e8c0cf7b
  by Cheng Shao at 2025-09-13T15:24:07+02:00

  ghci: LoadDLL -> LoadDLLs
  
  Closes #25407.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 1d4c6de7
  by Cheng Shao at 2025-09-13T15:24:12+02:00

  driver: separate downsweep/upsweep in loadPackages'
  

• fb461fec
  by Cheng Shao at 2025-09-13T15:24:12+02:00

  driver: parallelize DLL loading
  
  -------------------------
  Metric Increase:
      TcPlugin_RewritePerf
  -------------------------
  

424 changed files:

• .gitlab-ci.yml
• .gitlab/generate-ci/gen_ci.hs
• .gitlab/jobs.yaml
• .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
• .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
• compiler/GHC/Builtin/Names/TH.hs
• compiler/GHC/Builtin/Uniques.hs
• compiler/GHC/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Breakpoints.hs
• compiler/GHC/ByteCode/Instr.hs
• compiler/GHC/ByteCode/Types.hs
• compiler/GHC/Cmm/Dataflow/Label.hs
• compiler/GHC/Cmm/Utils.hs
• compiler/GHC/Core/Coercion.hs
• compiler/GHC/Core/Coercion.hs-boot
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/Lint.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/Pipeline/Types.hs
• compiler/GHC/Core/Opt/Simplify.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Inline.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/WorkWrap.hs
• compiler/GHC/Core/Reduction.hs
• compiler/GHC/Core/Rules.hs
• compiler/GHC/Core/TyCo/Compare.hs
• compiler/GHC/Core/TyCo/FVs.hs
• compiler/GHC/Core/TyCo/Rep.hs
• compiler/GHC/Core/TyCo/Subst.hs
• compiler/GHC/Core/TyCo/Tidy.hs
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• compiler/GHC/Core/Unify.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/CoreToIface.hs
• compiler/GHC/Data/IOEnv.hs
• compiler/GHC/Driver/CodeOutput.hs
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• compiler/GHC/HsToCore/Binds.hs
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• compiler/GHC/Linker/Loader.hs
• compiler/GHC/Linker/MacOS.hs
• compiler/GHC/Linker/Types.hs
• compiler/GHC/Parser.y
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• compiler/GHC/Rename/HsType.hs
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• docs/users_guide/separate_compilation.rst
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• hadrian/cfg/default.host.target.in
• hadrian/cfg/default.target.in
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• hadrian/src/Oracles/Flag.hs
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• hadrian/src/Rules/ToolArgs.hs
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• libraries/base/src/Data/Fixed.hs
• libraries/base/src/GHC/RTS/Flags.hs
• libraries/base/src/GHC/Stack/CloneStack.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Monad.hs
• libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
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• libraries/ghc-heap/GHC/Exts/Heap/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/Constants.hsc
• libraries/ghc-heap/GHC/Exts/Heap/InfoTable.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc
• libraries/ghc-heap/GHC/Exts/Heap/InfoTable/Types.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable/Types.hsc
• libraries/ghc-heap/GHC/Exts/Heap/InfoTableProf.hsc → libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc
• + libraries/ghc-internal/src/GHC/Internal/Heap/ProfInfo/Types.hs
• libraries/ghc-internal/src/GHC/Internal/List.hs
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• libraries/ghc-internal/src/GHC/Internal/Stack/CloneStack.hs
• libraries/ghc-heap/GHC/Exts/Stack/Constants.hsc → libraries/ghc-internal/src/GHC/Internal/Stack/Constants.hsc
• + libraries/ghc-internal/src/GHC/Internal/Stack/Decode.hs
• libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs
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• libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs
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• libraries/ghc-heap/tests/stack-annotation/TestUtils.hs → libraries/ghc-internal/tests/stack-annotation/TestUtils.hs
• libraries/ghc-heap/tests/stack-annotation/all.T → libraries/ghc-internal/tests/stack-annotation/all.T
• libraries/ghc-heap/tests/stack-annotation/ann_frame001.hs → libraries/ghc-internal/tests/stack-annotation/ann_frame001.hs
• libraries/ghc-heap/tests/stack-annotation/ann_frame001.stdout → libraries/ghc-internal/tests/stack-annotation/ann_frame001.stdout
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• libraries/ghc-heap/tests/stack-annotation/ann_frame004.hs → libraries/ghc-internal/tests/stack-annotation/ann_frame004.hs
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• libraries/ghci/GHCi/Message.hs
• libraries/ghci/GHCi/ObjLink.hs
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• − m4/fp_settings.m4
• m4/fp_setup_windows_toolchain.m4
• m4/ghc_toolchain.m4
• m4/prep_target_file.m4
• + m4/subst_tooldir.m4
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• rts/CloneStack.c
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• + rts/ClosureTable.c
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• rts/Schedule.c
• rts/StgMiscClosures.cmm
• rts/Threads.c
• + rts/TimeoutQueue.c
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• rts/linker/MachO.c
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• testsuite/tests/backpack/should_fail/bkpfail11.stderr
• testsuite/tests/backpack/should_fail/bkpfail43.stderr
• testsuite/tests/codeGen/should_compile/T25166.stdout → testsuite/tests/codeGen/should_compile/T25166.stdout-ws-32
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• testsuite/tests/count-deps/CountDepsAst.stdout
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• testsuite/tests/interface-stability/template-haskell-exports.stdout
• − testsuite/tests/lib/stm/T26028.hs
• − testsuite/tests/lib/stm/T26028.stdout
• − testsuite/tests/lib/stm/all.T
• + testsuite/tests/linear/should_compile/T26332.hs
• testsuite/tests/linear/should_compile/all.T
• + testsuite/tests/patsyn/should_compile/T26331.hs
• + testsuite/tests/patsyn/should_compile/T26331a.hs
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• + testsuite/tests/typecheck/should_compile/T26154.hs
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• + testsuite/tests/typecheck/should_fail/T26255a.hs
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• + testsuite/tests/typecheck/should_fail/T26255b.hs
• + testsuite/tests/typecheck/should_fail/T26255b.stderr
• + testsuite/tests/typecheck/should_fail/T26255c.hs
• + testsuite/tests/typecheck/should_fail/T26255c.stderr
• + testsuite/tests/typecheck/should_fail/T26318.hs
• + testsuite/tests/typecheck/should_fail/T26318.stderr
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• + testsuite/tests/unboxedsums/UbxSumUnpackedSize.hs
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• utils/ghc-pkg/Main.hs
• utils/ghc-pkg/ghc-pkg.cabal.in
• utils/ghc-toolchain/exe/Main.hs
• utils/ghc-toolchain/ghc-toolchain.cabal
• + utils/ghc-toolchain/src/GHC/Toolchain/Library.hs
• utils/ghc-toolchain/src/GHC/Toolchain/PlatformDetails.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cpp.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Tools/Cxx.hs
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