Cheng Shao pushed to branch wip/haddock-move-binary-instances at Glasgow Haskell Compiler / GHC

Commits:

• d3e60e97
  by Ryan Scott at 2025-06-18T22:29:21-04:00

  Deprecate -Wdata-kinds-tc, make DataKinds issues in typechecker become errors
  
  !11314 introduced the `-Wdata-kinds-tc` warning as part of a fix for #22141.
  This was a temporary stopgap measure to allow users who were accidentally
  relying on code which needed the `DataKinds` extension in order to typecheck
  without having to explicitly enable the extension.
  
  Now that some amount of time has passed, this patch deprecates
  `-Wdata-kinds-tc` and upgrades any `DataKinds`-related issues in the
  typechecker (which were previously warnings) into errors.
  

• fd5b5177
  by Ryan Hendrickson at 2025-06-18T22:30:06-04:00

  haddock: Add redact-type-synonyms pragma
  
  `{-# OPTIONS_HADDOCK redact-type-synonyms #-}` pragma will hide the RHS
  of type synonyms, and display the result kind instead, if the RHS
  contains any unexported types.
  

• fbc0b92a
  by Vladislav Zavialov at 2025-06-22T04:25:16+03:00

  Visible forall in GADTs (#25127)
  
  Add support for visible dependent quantification `forall a -> t` in
  types of data constructors, e.g.
  
    data KindVal a where
      K :: forall k.
           forall (a::k) ->   -- now allowed!
           k ->
           KindVal a
  
  For details, see docs/users_guide/exts/required_type_arguments.rst,
  which has gained a new subsection.
  
  DataCon in compiler/GHC/Core/DataCon.hs
  ---------------------------------------
  The main change in this patch is that DataCon, the Core representation
  of a data constructor, now uses a different type to store user-written
  type variable binders:
  
    - dcUserTyVarBinders :: [InvisTVBinder]
    + dcUserTyVarBinders :: [TyVarBinder]
  
  where
  
    type TyVarBinder   = VarBndr TyVar ForAllTyFlag
    type InvisTVBinder = VarBndr TyVar Specificity
  
  and
  
    data Specificity  = InferredSpec | SpecifiedSpec
    data ForAllTyFlag = Invisible Specificity | Required
  
  This change necessitates some boring, mechanical changes scattered
  throughout the diff:
  
      ... is now used in place of ...
     -----------------+---------------
      TyVarBinder     | InvisTVBinder
      IfaceForAllBndr | IfaceForAllSpecBndr
      Specified       | SpecifiedSpec
      Inferred        | InferredSpec
      mkForAllTys     | mkInvisForAllTys
  
    additionally,
  
      tyVarSpecToBinders      -- added or removed calls
      ifaceForAllSpecToBndrs  -- removed calls
  
  Visibility casts in mkDataConRep
  --------------------------------
  Type abstractions in Core (/\a. e) always have type (forall a. t)
  because coreTyLamForAllTyFlag = Specified. This is also true of data
  constructor workers. So we may be faced with the following:
  
    data con worker:  (forall a.   blah)
    data con wrapper: (forall a -> blah)
  
  In this case the wrapper must use a visibility cast (e |> ForAllCo ...)
  with appropriately set fco_vis{L,R}. Relevant functions:
  
    mkDataConRep   in compiler/GHC/Types/Id/Make.hs
    dataConUserTyVarBindersNeedWrapper in compiler/GHC/Core/DataCon.hs
    mkForAllVisCos in compiler/GHC/Core/Coercion.hs
    mkCoreTyLams   in compiler/GHC/Core/Make.hs
    mkWpForAllCast in compiler/GHC/Tc/Types/Evidence.hs
  
  More specifically:
  
  - dataConUserTyVarBindersNeedWrapper has been updated to answer "yes"
    if there are visible foralls in the type of the data constructor.
  
  - mkDataConRep now uses mkCoreTyLams to generate the big lambda
    abstractions (/\a b c. e) in the data con wrapper.
  
  - mkCoreTyLams is a variant of mkCoreLams that applies visibility casts
    as needed. It similar in purpose to the pre-existing mkWpForAllCast,
    so the common bits have been factored out into mkForAllVisCos.
  
  ConDecl in compiler/Language/Haskell/Syntax/Decls.hs
  ----------------------------------------------------
  The surface syntax representation of a data constructor declaration is
  ConDecl. In accordance with the proposal, only GADT syntax is extended
  with support for visible forall, so we are interested in ConDeclGADT.
  
  ConDeclGADT's field con_bndrs has been renamed to con_outer_bndrs
  and is now accompanied by con_inner_bndrs:
  
    con_outer_bndrs :: XRec pass (HsOuterSigTyVarBndrs pass)
    con_inner_bndrs :: [HsForAllTelescope pass]
  
  Visible foralls always end up in con_inner_bndrs. The outer binders are
  stored and processed separately to support implicit quantification and
  the forall-or-nothing rule, a design established by HsSigType.
  
  A side effect of this change is that even in absence of visible foralls,
  GHC now permits multiple invisible foralls, e.g.
  
    data T a where { MkT :: forall a b. forall c d. ... -> T a }
  
  But of course, this is done in service of making at least some of these
  foralls visible. The entire compiler front-end has been updated to deal
  with con_inner_bndrs. See the following modified or added functions:
  
    Parser:
        mkGadtDecl     in compiler/GHC/Parser/PostProcess.hs
        splitLHsGadtTy in compiler/GHC/Hs/Type.hs
    Pretty-printer:
        pprConDecl           in compiler/GHC/Hs/Decls.hs
        pprHsForAllTelescope in compiler/GHC/Hs/Type.hs
    Renamer:
        rnConDecl                 in compiler/GHC/Rename/Module.hs
        bindHsForAllTelescopes    in compiler/GHC/Rename/HsType.hs
        extractHsForAllTelescopes in compiler/GHC/Rename/HsType.hs
    Type checker:
        tcConDecl           in compiler/GHC/Tc/TyCl.hs
        tcGadtConTyVarBndrs in compiler/GHC/Tc/Gen/HsType.hs
  
  Template Haskell
  ----------------
  The TH AST is left unchanged for the moment to avoid breakage. An
  attempt to quote or reify a data constructor declaration with visible
  forall in its type will result an error:
  
    data ThRejectionReason       -- in GHC/HsToCore/Errors/Types.hs
      = ...
      | ThDataConVisibleForall   -- new error constructor
  
  However, as noted in the previous section, GHC now permits multiple
  invisible foralls, and TH was updated accordingly. Updated code:
  
        repC         in compiler/GHC/HsToCore/Quote.hs
        reifyDataCon in compiler/GHC/Tc/Gen/Splice.hs
        ppr @Con     in libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
  
  Pattern matching
  ----------------
  Everything described above concerns data constructor declarations, but
  what about their use sites? Now it is trickier to type check a pattern
  match fn(Con a b c)=... because we can no longer assume that a,b,c are
  all value arguments. Indeed, some or all of them may very well turn out
  to be required type arguments.
  
  To that end, see the changes to:
  
        tcDataConPat   in compiler/GHC/Tc/Gen/Pat.hs
        splitConTyArgs in compiler/GHC/Tc/Gen/Pat.hs
  
  and the new helpers split_con_ty_args, zip_pats_bndrs.
  
  This is also the reason the TcRnTooManyTyArgsInConPattern error
  constructor has been removed. The new code emits TcRnArityMismatch
  or TcRnIllegalInvisibleTypePattern.
  
  Summary
  -------
  DataCon, ConDecl, as well as all related functions have been updated to
  support required type arguments in data constructors.
  
  Test cases:
    HieGadtConSigs   GadtConSigs_th_dump1   GadtConSigs_th_pprint1
    T25127_data      T25127_data_inst       T25127_infix
    T25127_newtype   T25127_fail_th_quote   T25127_fail_arity
    TyAppPat_Tricky
  
  Co-authored-by: mniip <mniip@mniip.com>
  

• ae003a3a
  by Teo Camarasu at 2025-06-23T05:21:48-04:00

  linters: lint-whitespace: bump upper-bound for containers
  
  The version of containers was bumped in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13989
  

• 0fb37893
  by Matthew Pickering at 2025-06-23T13:55:10-04:00

  Move ModuleGraph into UnitEnv
  
  The ModuleGraph is a piece of information associated with the
  ExternalPackageState and HomeUnitGraph. Therefore we should store it
  inside the HomeUnitEnv.
  

• 3bf6720e
  by soulomoon at 2025-06-23T13:55:52-04:00

  Remove hptAllFamInstances usage during upsweep
  
  Fixes #26118
  
  This change eliminates the use of hptAllFamInstances during the upsweep phase,
  as it could access non-below modules from the home package table.
  
  The following updates were made:
  
  * Updated checkFamInstConsistency to accept an explicit ModuleEnv FamInstEnv
    parameter and removed the call to hptAllFamInstances.
  * Adjusted hugInstancesBelow so we can construct ModuleEnv FamInstEnv
    from its result,
  * hptAllFamInstances and allFamInstances functions are removed.
  

• 83ee7b78
  by Ben Gamari at 2025-06-24T05:02:07-04:00

  configure: Don't force value of OTOOL, etc. if not present
  
  Previously if `otool` and `install_name_tool` were not present they
  would be overridden by `fp_settings.m4`. This logic was introduced in
  4ff93292243888545da452ea4d4c1987f2343591 without explanation.
  

• 9329c9e1
  by Ben Gamari at 2025-06-24T05:02:07-04:00

  ghc-toolchain: Add support for otool, install_name_tool
  
  Fixes part of ghc#23675.
  

• 25f5c998
  by Ben Gamari at 2025-06-24T05:02:08-04:00

  ghc-toolchain: Add support for llc, opt, llvm-as
  
  Fixes #23675.
  

• 51d150dd
  by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00

  hadrian: Use settings-use-distro-mingw directly
  
  The type `ToolchainSetting` only made sense when we had more settings to
  fetch from the system config file. Even then "settings-use-distro-mingw"
  is arguably not a toolchain setting.
  
  With the fix for #23675, all toolchain tools were moved to the
  `ghc-toolchain` `Toolchain` format. Therefore, we can inline
  `settings-use-distro-mingw` accesses and delete `ToolchainSetting`.
  

• dcf68a83
  by Rodrigo Mesquita at 2025-06-24T05:02:08-04:00

  configure: Check LlvmTarget exists for LlvmAsFlags
  
  If LlvmTarget was empty, LlvmAsFlags would be just "--target=".
  If it is empty now, simply keep LlvmAsFlags empty.
  
  ghc-toolchain already does this right. This fix makes the two
  configurations match up.
  

• 580a3353
  by Ben Gamari at 2025-06-24T05:02:51-04:00

  rts/linker/LoadArchive: Use bool
  
  Improve type precision by using `bool` instead of `int` and `StgBool`.
  

• 76d1041d
  by Ben Gamari at 2025-06-24T05:02:51-04:00

  rts/linker/LoadArchive: Don't rely on file extensions for identification
  
  Previously archive members would be identified via their file extension,
  as described in #13103. We now instead use a more principled approach,
  relying on the magic number in the member's header.
  
  As well, we refactor treatment of archive format detection to improve
  code clarity and error handling.
  
  Closes #13103.
  

• 4b748a99
  by Teo Camarasu at 2025-06-24T15:31:07-04:00

  template-haskell: improve changelog
  
  
  stable -> more stable, just to clarify that this interface isn't fully stable.
  
  errornously -> mistakenly: I typod this and also let's go for a simpler word

• e358e477
  by Sylvain Henry at 2025-06-24T15:31:58-04:00

  Bump stack resolver to use GHC 9.6.7
  
  Cf #26139
  

• 4bf5eb63
  by fendor at 2025-06-25T17:05:43-04:00

  Teach `:reload` about multiple home units
  
  `:reload` needs to lookup the `ModuleName` and must not assume the given
  `ModuleName` is in the current `HomeUnit`.
  
  We add a new utility function which allows us to find a `HomeUnitModule`
  instead of a `Module`.
  
  Further, we introduce the `GhciCommandError` type which can be used to
  abort the execution of a GHCi command.
  This error is caught and printed in a human readable fashion.
  

• b3d97bb3
  by fendor at 2025-06-25T17:06:25-04:00

  Implement `-fno-load-initial-targets` flag
  
  We add the new flag `-fno-load-initial-targets` which doesn't load all `Target`s
  immediately but only computes the module graph for all `Target`s.
  The user can then decide to load modules from that module graph using
  the syntax:
  
      ghci> :reload <Mod>
  
  This will load everything in the module graph up to `Mod`.
  
  The user can return to the initial state by using the builtin target
  `none` to unload all modules.
  
      ghci> :reload none
  
  Is in principle identical to starting a new session with the
  `-fno-load-initial-targets` flag.
  
  The `-fno-load-initial-targets` flag allows for faster startup time of GHCi when a
  user has lots of `Target`s.
  
  We additionally extend the `:reload` command to accept multiple
  `ModuleName`s. For example:
  
      ghci> :reload <Mod1> <Mod2>
  
  Loads all modules up to the modules `Mod1` and `Mod2`.
  

• 49f44e52
  by Teo Camarasu at 2025-06-26T04:19:51-04:00

  Expose ghc-internal unit id through the settings file
  
  This in combination with the unit id of the compiler library allows
  cabal to know of the two unit ids that should not be reinstalled (in
  specific circumstances) as:
  - when using plugins, we want to link against exactly the compiler unit
  id
  - when using TemplateHaskell we want to link against exactly the package
  that contains the TemplateHaskell interfaces, which is `ghc-internal`
  
  See: <https://github.com/haskell/cabal/issues/10087>
  
  Resolves #25282
  

• 499c4efe
  by Bryan Richter at 2025-06-26T04:20:33-04:00

  CI: Fix and clean up capture of timings
  
  * Fixes the typo that caused 'cat ci-timings' to report "no such file or
    directory"
  * Gave ci_timings.txt a file extension so it may play better with other
    systems
  * Fixed the use of time_it so all times are recorded
  * Fixed time_it to print name along with timing
  

• 86c90c9e
  by Bryan Richter at 2025-06-26T04:20:33-04:00

  CI: Update collapsible section usage
  
  The syntax apparently changed at some point.
  

• 04308ee4
  by Bryan Richter at 2025-06-26T04:20:33-04:00

  CI: Add more collapsible sections
  

• 43b606bb
  by Florian Ragwitz at 2025-06-27T16:31:26-04:00

  Tick uses of wildcard/pun field binds as if using the record selector function
  
  Fixes #17834.
  
  See Note [Record-selector ticks] for additional reasoning behind this as well
  as an overview of the implementation details and future improvements.
  

• d4952549
  by Ben Gamari at 2025-06-27T16:32:08-04:00

  testsuite/caller-cc: Make CallerCc[123] less sensitive
  
  These were previously sensitive to irrelevant changes in program
  structure. To avoid this we filter out all by lines emitted by the
  -fcaller-cc from the profile.
  

• 8d33d048
  by Berk Özkütük at 2025-07-07T20:42:20-04:00

  Consider `PromotedDataCon` in `tyConStupidTheta`
  
  Haddock checks data declarations for the stupid theta so as not to
  pretty-print them as empty contexts. Type data declarations end up as
  `PromotedDataCon`s by the time Haddock performs this check, causing a
  panic. This commit extends `tyConStupidTheta` so that it returns an
  empty list for `PromotedDataCon`s. This decision was guided by the fact
  that type data declarations never have data type contexts (see (R1) in
  Note [Type data declarations]).
  
  Fixes #25739.
  

• a26243fd
  by Ryan Hendrickson at 2025-07-07T20:43:07-04:00

  haddock: Document instances from other packages
  
  When attaching instances to `Interface`s, it isn't enough just to look
  for instances in the list of `Interface`s being processed. We also need
  to look in the modules on which they depend, including those outside of
  this package.
  
  Fixes #25147.
  Fixes #26079.
  

• 0fb24420
  by Rodrigo Mesquita at 2025-07-07T20:43:49-04:00

  hadrian: Fallback logic for internal interpreter
  
  When determining whether to build the internal interpreter, the `make`
  build system had a fallback case for platforms not in the list of
  explicitly-supported operating systems and architectures.
  
  This fallback says we should try to build the internal interpreter if
  building dynamic GHC programs (if the architecture is unknown).
  
  Fixes #24098
  

• fe925bd4
  by Ben Gamari at 2025-07-07T20:44:30-04:00

  users-guide: Reference Wasm FFI section
  

• 5856284b
  by Ben Gamari at 2025-07-07T20:44:30-04:00

  users-guide: Fix too-short heading warning
  

• a48dcdf3
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Reorganise documentation for allocate* functions
  
  Consolodate interface information into the .h file, keeping just
  implementation details in the .c file.
  
  Use Notes stlye in the .h file and refer to notes from the .c file.
  

• de5b528c
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Introduce common utilities for allocating arrays
  
  The intention is to share code among the several places that do this
  already.
  

• b321319d
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in Heap.c
  
  The CMM primop can now report heap overflow.
  

• 1d557ffb
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in ThreadLabels.c
  
  Replacing a local utility.
  

• e59a1430
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in Threads.c
  
  Replacing local open coded version.
  

• 482df1c9
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Add exitHeapOverflow helper utility
  
  This will be useful with the array alloc functions, since unlike
  allocate/allocateMaybeFail, they do not come in two versions. So if it's
  not convenient to propagate failure, then one can use this.
  

• 4d3ec8f9
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Use new array alloc utils in Weak.c
  
  Also add a cpp macro CCS_SYSTEM_OR_NULL which does what it says. The
  benefit of this is that it allows us to referece CCS_SYSTEM even when
  we're not in PROFILING mode. That makes abstracting over profiling vs
  normal mode a lot easier.
  

• 0c4f2fde
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  Convert the array alloc primops to use the new array alloc utils
  

• a3354ad9
  by Duncan Coutts at 2025-07-07T20:45:18-04:00

  While we're at it, add one missing 'likely' hint
  
  To a cmm primops that raises an exception, like the others now do.
  

• 33b546bd
  by meooow25 at 2025-07-07T20:46:09-04:00

  Keep scanl' strict in the head on rewrite
  
  `scanl'` forces elements to WHNF when the corresponding `(:)`s are
  forced. The rewrite rule for `scanl'` missed forcing the first element,
  which is fixed here with a `seq`.
  

• 8a69196e
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  debugger/rts: Allow toggling step-in per thread
  
  The RTS global flag `rts_stop_next_breakpoint` globally sets the
  interpreter to stop at the immediate next breakpoint.
  
  With this commit, single step mode can additionally be set per thread in
  the TSO flag (TSO_STOP_NEXT_BREAKPOINT).
  
  Being able to toggle "stop at next breakpoint" per thread is an
  important requirement for implementing "stepping out" of a function in a
  multi-threaded context.
  
  And, more generally, having a per-thread flag for single-stepping paves the
  way for multi-threaded debugging.
  
  That said, when we want to enable "single step" mode for the whole
  interpreted program we still want to stop at the immediate next
  breakpoint, whichever thread it belongs to.
  
  That's why we also keep the global `rts_stop_next_breakpoint` flag, with
  `rts_enableStopNextBreakpointAll` and `rts_disableStopNextBreakpointAll` helpers.
  
  Preparation for #26042
  

• 73d3f864
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  docs: Case continuation BCOs
  
  This commit documents a subtle interaction between frames for case BCOs
  and their parents frames. Namely, case continuation BCOs may refer to
  (non-local) variables that are part of the parent's frame.
  
  The note expanding a bit on these details is called [Case continuation BCOs]
  

• d7aeddcf
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  debugger: Implement step-out feature
  
  Implements support for stepping-out of a function (aka breaking right after
  returning from a function) in the interactive debugger.
  
  It also introduces a GHCi command :stepout to step-out of a function
  being debugged in the interpreter. The feature is described as:
  
      Stop at the first breakpoint immediately after returning from the current
      function scope.
  
      Known limitations: because a function tail-call does not push a stack
      frame, if step-out is used inside of a function that was tail-called,
      execution will not be returned to its caller, but rather its caller's
      first non-tail caller. On the other hand, it means the debugger
      follows the more realistic execution of the program.
      In the following example:
  
      .. code-block:: none
  
      f = do
         a
         b <--- (1) set breakpoint then step in here
         c
      b = do
         ...
         d <--- (2) step-into this tail call
      d = do
         ...
         something <--- (3) step-out here
         ...
  
      Stepping-out will stop execution at the `c` invokation in `f`, rather than
      stopping at `b`.
  
  The key idea is simple: When step-out is enabled, traverse the runtime
  stack until a continuation BCO is found -- and enable the breakpoint
  heading that BCO explicitly using its tick-index.
  The details are specified in `Note [Debugger: Step-out]` in `rts/Interpreter.c`.
  
  Since PUSH_ALTS BCOs (representing case continuations) were never headed
  by a breakpoint (unlike the case alternatives they push), we introduced
  the BRK_ALTS instruction to allow the debugger to set a case
  continuation to stop at the breakpoint heading the alternative that is
  taken. This is further described in `Note [Debugger: BRK_ALTS]`.
  
  Fixes #26042
  

• 5d9adf51
  by Rodrigo Mesquita at 2025-07-08T07:39:47-04:00

  debugger: Filter step-out stops by SrcSpan
  
  To implement step-out, the RTS looks for the first continuation frame on
  the stack and explicitly enables its entry breakpoint. However, some
  continuations will be contained in the function from which step-out was
  initiated (trivial example is a case expression).
  
  Similarly to steplocal, we will filter the breakpoints at which the RTS
  yields to the debugger based on the SrcSpan. When doing step-out, only
  stop if the breakpoint is /not/ contained in the function from which we
  initiated it.
  
  This is especially relevant in monadic statements such as IO which is
  compiled to a long chain of case expressions.
  
  See Note [Debugger: Filtering step-out stops]
  

• 7677adcc
  by Cheng Shao at 2025-07-08T07:40:29-04:00

  compiler: make ModBreaks serializable
  

• 14f67c6d
  by Rodrigo Mesquita at 2025-07-08T07:40:29-04:00

  refactor: "Inspecting the session" moved from GHC
  
  Moved utilities for inspecting the session from the GHC module to
  GHC.Driver.Session.Inspect
  
  Purely a clean up
  

• 9d3f484a
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Pass the HUG to readModBreaks, not HscEnv
  
  A minor cleanup. The associated history and setupBreakpoint functions
  are changed accordingly.
  

• b595f713
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Move readModBreaks to GHC.Runtime.Interpreter
  
  With some small docs changes
  

• d223227a
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Move interpreterProfiled to Interp.Types
  
  Moves interpreterProfiled and interpreterDynamic to
  GHC.Runtime.Interpreter.Types from GHC.Runtime.Interpreter.
  

• 7fdd0a3d
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Don't import GHC in Debugger.Breakpoints
  
  Remove the top-level
  
      import GHC
  
  from GHC.Runtime.Debugger.Breakpoints
  
  This makes the module dependencies more granular and cleans up the
  qualified imports from the code.
  

• 5e4da31b
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  refactor: Use BreakpointId in Core and Ifaces
  

• 741ac3a8
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  stg2bc: Derive BcM via ReaderT StateT
  
  A small refactor that simplifies GHC.StgToByteCode by deriving-via the
  Monad instances for BcM. This is done along the lines of previous
  similar refactors like 72b54c0760bbf85be1f73c1a364d4701e5720465.
  

• 0414fcc9
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  refact: Split InternalModBreaks out of ModBreaks
  
  There are currently two competing ways of referring to a Breakpoint:
  
      1. Using the Tick module + Tick index
      2. Using the Info module + Info index
  
  1. The Tick index is allocated during desugaring in `mkModBreaks`. It is
  used to refer to a breakpoint associated to a Core Tick. For a given
  Tick module, there are N Ticks indexed by Tick index.
  
  2. The Info index is allocated during code generation (in StgToByteCode)
  and uniquely identifies the breakpoints at runtime (and is indeed used
  to determine which breakpoint was hit at runtime).
  
  Why we need both is described by Note [Breakpoint identifiers].
  
  For every info index we used to keep a `CgBreakInfo`, a datatype containing
  information relevant to ByteCode Generation, in `ModBreaks`.
  
  This commit splits out the `IntMap CgBreakInfo` out of `ModBreaks` into
  a new datatype `InternalModBreaks`.
  
      - The purpose is to separate the `ModBreaks` datatype, which stores
        data associated from tick-level information which is fixed after
        desugaring, from the unrelated `IntMap CgBreakInfo` information
        accumulated during bytecode generation.
  
      - We move `ModBreaks` to GHC.HsToCore.Breakpoints
  
  The new `InternalModBreaks` simply combines the `IntMap CgBreakInfo`
  with `ModBreaks`. After code generation we construct an
  `InternalModBreaks` with the `CgBreakInfo`s we accumulated and the
  existing `ModBreaks` and store that in the compiled BCO in `bc_breaks`.
  
      - Note that we previously only updated the `modBreaks_breakInfo`
        field of `ModBreaks` at this exact location, and then stored the
        updated `ModBreaks` in the same `bc_breaks`.
  
      - We put this new datatype in GHC.ByteCode.Breakpoints
  
  The rest of the pipeline for which CgBreakInfo is relevant is
  accordingly updated to also use `InternalModBreaks`
  

• 2a097955
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  cleanup: Use BreakpointIds in bytecode gen
  
  Small clean up to use BreakpointId and InternalBreakpointId more
  uniformly in bytecode generation rather than using Module + Ix pairs
  

• 0515cc2f
  by Rodrigo Mesquita at 2025-07-08T07:40:30-04:00

  ghci: Allocate BreakArrays at link time only
  
  Previously, a BreakArray would be allocated with a slot for every tick
  in a module at `mkModBreaks`, in HsToCore. However, this approach has
  a few downsides:
  
  - It interleaves interpreter behaviour (allocating arrays for
    breakpoints) within the desugarer
  
  - It is inflexible in the sense it is impossible for the bytecode
    generator to add "internal" breakpoints that can be triggered at
    runtime, because those wouldn't have a source tick. (This is relevant
    for our intended implementation plan of step-out in #26042)
  
  - It ties the BreakArray indices to the *tick* indexes, while at runtime
    we would rather just have the *info* indexes (currently we have both
    because BreakArrays are indexed by the *tick* one).
  
  Paving the way for #26042 and #26064, this commit moves the allocation
  of BreakArrays to bytecode-loading time -- akin to what is done for CCS
  arrays.
  
  Since a BreakArray is allocated only when bytecode is linked, if a
  breakpoint is set (e.g. `:break 10`) before the bytecode is linked,
  there will exist no BreakArray to trigger the breakpoint in.
  
  Therefore, the function to allocate break arrays (`allocateBreakArrays`)
  is exposed and also used in GHC.Runtime.Eval to allocate a break array
  when a breakpoint is set, if it doesn't exist yet (in the linker env).
  

• 8016561f
  by Simon Peyton Jones at 2025-07-08T07:41:13-04:00

  Add a test for T26176
  

• 454cd682
  by Simon Peyton Jones at 2025-07-08T07:41:13-04:00

  Add test for #14010
  
  This test started to work in GHC 9.6 and has worked since.
  This MR just adds a regression test
  

• ea2c6673
  by Teo Camarasu at 2025-07-08T13:24:43-04:00

  Implement user-defined allocation limit handlers
  
  Allocation Limits allow killing a thread if they allocate more than a
  user-specified limit.
  We extend this feature to allow more versatile behaviour.
  
  - We allow not killing the thread if the limit is exceeded.
  - We allow setting a custom handler to be called when the limit is exceeded.
  
  User-specified allocation limit handlers run in a fresh thread and are passed
  the ThreadId of the thread that exceeded its limit.
  
  We introduce utility functions for getting and setting the allocation
  limits of other threads, so that users can reset the limit of a thread
  from a handler. Both of these are somewhat coarse-grained as we are
  unaware of the allocations in the current nursery chunk.
  
  We provide several examples of usages in testsuite/tests/rts/T22859.hs
  
  Resolves #22859
  

• 03e047f9
  by Simon Hengel at 2025-07-08T13:25:25-04:00

  Fix typo in using.rst
  

• 67957854
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  compiler: Import AnnotationWrapper from ghc-internal
  
  Since `GHC.Desugar` exported from `base` has been deprecated.
  

• 813d99d6
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  ghc-compact: Eliminate dependency on ghc-prim
  

• 0ec952a1
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  ghc-heap: Eliminate dependency on ghc-prim
  

• 480074c3
  by Ben Gamari at 2025-07-09T09:44:44-04:00

  ghc-heap: Drop redundant import
  

• 03455829
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  ghc-prim: Bump version to 0.13.1
  
  There are no interface changes from 0.13.0 but the implementation now
  lives in `ghc-internal`.
  

• d315345a
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  template-haskell: Bump version number to 2.24.0.0
  
  Bumps exceptions submodule.
  

• 004c800e
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  Bump GHC version number to 9.14
  

• eb1a3816
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  Bump parsec to 3.1.18.0
  
  Bumps parsec submodule.
  

• 86f83296
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  unix: Bump to 2.8.7.0
  
  Bumps unix submodule.
  

• 89e13998
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  binary: Bump to 0.8.9.3
  
  Bumps binary submodule.
  

• 55fff191
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  Win32: Bump to 2.14.2.0
  
  Bumps Win32 submodule.
  

• 7dafa40c
  by Ben Gamari at 2025-07-09T09:44:45-04:00

  base: Bump version to 4.22.0
  
  Bumps various submodules.
  

• ef03d8b8
  by Rodrigo Mesquita at 2025-07-09T09:45:28-04:00

  base: Export displayExceptionWithInfo
  
  This function should be exposed from base following CLC#285
  
  Approved change in CLC#344
  
  Fixes #26058
  

• 01d3154e
  by Wen Kokke at 2025-07-10T17:06:36+01:00

  Fix documentation for HEAP_PROF_SAMPLE_STRING
  

• ac259c48
  by Wen Kokke at 2025-07-10T17:06:38+01:00

  Fix documentation for HEAP_PROF_SAMPLE_COST_CENTRE
  

• 2b4db9ba
  by Pi Delport at 2025-07-11T16:40:52-04:00

  (Applicative docs typo: missing "one")
  

• f707bab4
  by Andreas Klebinger at 2025-07-12T14:56:16+01:00

  Specialise: Improve specialisation by refactoring interestingDict
  
  This MR addresses #26051, which concerns missed type-class specialisation.
  The main payload of the MR is to completely refactor the key function
        `interestingDict` in GHC.Core.Opt.Specialise
  
  The main change is that we now also look at the structure of the
  dictionary we consider specializing on, rather than only the type.
  
  See the big `Note [Interesting dictionary arguments]`
  

• ca7a9d42
  by Simon Peyton Jones at 2025-07-12T14:56:16+01:00

  Treat tuple dictionaries uniformly; don't unbox them
  
  See `Note [Do not unbox class dictionaries]` in DmdAnal.hs,
  sep (DNB1).
  
  This MR reverses the plan in #23398, which suggested a special case to
  unbox tuple dictionaries in worker/wrapper.  But:
  
  - This was the cause of a pile of complexity in the specialiser (#26158)
  
  - Even with that complexity, specialision was still bad, very bad
    See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297
  
  And it's entirely unnecessary!  Specialision works fine without
  unboxing tuple dictionaries.
  

• be7296c9
  by Andreas Klebinger at 2025-07-12T14:56:16+01:00

  Remove complex special case from the type-class specialiser
  
  There was a pretty tricky special case in Specialise which is no
  longer necessary.
     * Historical Note [Floating dictionaries out of cases]
     * #26158
     * #19747 https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297
  
  This MR removes it.  Hooray.
  

• 4acf3a86
  by Ben Gamari at 2025-07-15T05:46:32-04:00

  configure: bump version to 9.15
  

• 45efaf71
  by Teo Camarasu at 2025-07-15T05:47:13-04:00

  rts/nonmovingGC: remove n_free
  
  We remove the nonmovingHeap.n_free variable.
  
  We wanted this to track the length of nonmovingHeap.free.
  But this isn't possible to do atomically.
  
  When this isn't accurate we can get a segfault by going past the end of
  the list.
  
  Instead, we just count the length of the list when we grab it in
  nonmovingPruneFreeSegment.
  
  Resolves #26186
  

• c635f164
  by Ben Gamari at 2025-07-15T14:05:54-04:00

  configure: Drop probing of ld.gold
  
  As noted in #25716, `gold` has been dropped from binutils-2.44.
  
  Fixes #25716.
  
  Metric Increase:
      size_hello_artifact_gzip
      size_hello_unicode_gzip
      ghc_prim_so
  

• 637bb538
  by Ben Gamari at 2025-07-15T14:05:55-04:00

  testsuite/recomp015: Ignore stderr
  
  This is necessary since ld.bfd complains
  that we don't have a .note.GNU-stack section,
  potentially resulting in an executable stack.

• d3cd4ec8
  by Wen Kokke at 2025-07-15T14:06:39-04:00

  Fix documentation for heap profile ID
  

• 73082769
  by Ben Gamari at 2025-07-15T16:56:38-04:00

  Bump win32-tarballs to v0.9

• 3b63b254
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  rts/LoadArchive: Handle null terminated string tables
  
  As of `llvm-ar` now emits filename tables terminated with null
  characters instead of the usual POSIX `/\n` sequence.
  
  Fixes #26150.
  

• 195f6527
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: rename label so name doesn't conflict with param
  

• 63373b95
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Handle API set symbol versioning conflicts
  

• 48e9aa3e
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Mark API set symbols as HIDDEN and correct symbol type
  

• 959e827a
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Implement WEAK EXTERNAL undef redirection by target symbol name
  

• 65f19293
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  rts/LoadArchive: Handle string table entries terminated with /
  
  llvm-ar appears to terminate string table entries with `/\n` [1]. This
  matters in the case of thin archives, since the filename is used. In the
  past this worked since `llvm-ar` would produce archives with "small"
  filenames when possible. However, now it appears to always use the
  string table.
  
  [1] https://github.com/llvm/llvm-project/blob/bfb686bb5ba503e9386dc899e1ebbe2488e6a0a8/llvm/lib/Object/ArchiveWriter.cpp#L314
  

• 9cbb3ef5
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  testsuite: Mark T12497 as fixed
  
  Thanks to the LLVM toolchain update.
  
  Closes #22694.
  

• 2854407e
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  testsuite: Accept new output of T11223_link_order_a_b_2_fail on Windows
  
  The archive member number changed due to the fact that llvm-ar now uses a
  string table.
  

• 28439593
  by Ben Gamari at 2025-07-15T16:56:39-04:00

  rts/linker/PEi386: Implement IMAGE_REL_AMD64_SECREL
  
  This appears to now be used by libc++ as distributed by msys2.
  

• 2b053755
  by Tamar Christina at 2025-07-15T16:56:39-04:00

  rts: Cleanup merge resolution residue in lookupSymbolInDLL_PEi386 and make safe without dependent
  

• e8acd2e7
  by Wen Kokke at 2025-07-16T08:37:04-04:00

  Remove the `profile_id` parameter from various RTS functions.
  
  Various RTS functions took a `profile_id` parameter, intended to be used to
  distinguish parallel heap profile breakdowns (e.g., `-hT` and `-hi`). However,
  this feature was never implemented and the `profile_id` parameter was set to 0
  throughout the RTS. This commit removes the parameter but leaves the hardcoded
  profile ID in the functions that emit the encoded eventlog events as to not
  change the protocol.
  
  The affected functions are `traceHeapProfBegin`, `postHeapProfBegin`,
  `traceHeapProfSampleString`, `postHeapProfSampleString`,
  `traceHeapProfSampleCostCentre`, and `postHeapProfSampleCostCentre`.
  

• 76d392a2
  by Wen Kokke at 2025-07-16T08:37:04-04:00

  Make `traceHeapProfBegin` an init event.
  

• bbaa44a7
  by Peng Fan at 2025-07-16T16:50:42-04:00

  NCG/LA64: Support finer-grained DBAR hints
  
  For LA664 and newer uarchs, they have made finer granularity hints
  available:
  
      Bit4: ordering or completion (0: completion, 1: ordering)
      Bit3: barrier for previous read (0: true, 1: false)
      Bit2: barrier for previous write (0: true, 1: false)
      Bit1: barrier for succeeding read (0: true, 1: false)
      Bit0: barrier for succeeding write (0: true, 1: false)
  
  And not affect the existing models because other hints are treated
  as 'dbar 0' there.
  

• 7da86e16
  by Andreas Klebinger at 2025-07-16T16:51:25-04:00

  Disable -fprof-late-overloaded-calls for join points.
  
  Currently GHC considers cost centres as destructive to
  join contexts. Or in other words this is not considered valid:
  
      join f x = ...
      in
                ... -> scc<tick> jmp
  
  This makes the functionality of `-fprof-late-overloaded-calls` not feasible
  for join points in general. We used to try to work around this by putting the
  ticks on the rhs of the join point rather than around the jump. However beyond
  the loss of accuracy this was broken for recursive join points as we ended up
  with something like:
  
      rec-join f x = scc<tick> ... jmp f x
  
  Which similarly is not valid as the tick once again destroys the tail call.
  One might think we could limit ourselves to non-recursive tail calls and do
  something clever like:
  
    join f x = scc<tick> ...
    in ... jmp f x
  
  And sometimes this works! But sometimes the full rhs would look something like:
  
    join g x = ....
    join f x = scc<tick> ... -> jmp g x
  
  Which, would again no longer be valid. I believe in the long run we can make
  cost centre ticks non-destructive to join points. Or we could keep track of
  where we are/are not allowed to insert a cost centre. But in the short term I will
  simply disable the annotation of join calls under this flag.
  

• 7ee22fd5
  by ARATA Mizuki at 2025-07-17T06:05:30-04:00

  x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2#
  
  The new implementation
  
  * make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and
  * do not require -mavx.
  
  Close #26096
  
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• c6cd2da1
  by Jappie Klooster at 2025-07-17T06:06:20-04:00

  Update interact docs to explain about buffering
  
  We need to tell the user to set to the
  appropriate buffer format.
  Otherwise, this function may get randomly stuck,
  or just behave confusingly.
  
  issue: https://gitlab.haskell.org/ghc/ghc/-/issues/26131
  
  NB, I'm running this with cabal *NOT* ghci. ghci messes with buffering anyway.
  
  ```haskell
  interaction :: String -> String
  interaction "jappie" = "hi"
  interaction "jakob" = "hello"
  interaction x = "unkown input: " <> x
  
  main :: IO ()
  main = interact  interaction
  ```
  so in my input (prefixed by `>`) I get:
  
  ```
  > jappie
  unkown input: jappie
  ```
  
  we confirmed later this was due to lack of \n matching.
  Anyway movnig on to more unexpected stuff:
  
  ```haskell
  main :: IO ()
  main = do
    interact  (concatMap interaction . lines)
  ```
  
  get's stuck forever.
  actually `^D` (ctrl+d) unstucks it and runs all input as expected.
  for example you can get:
  ```
  > sdfkds
  > fakdsf
  unkown input: sdfkdsunkown input: fakdsf
  ```
  
  This program works!
  ```haskell
  interaction :: String -> String
  interaction "jappie" = "hi \n"
  interaction "jakob" = "hello \n"
  interaction x = "unkown input: " <> x <> "\n"
  
  main :: IO ()
  main = do
    interact  (concatMap interaction . lines)
  ```
  the reason is that linebuffering is set for both in and output by default.
  so lines eats the input lines, and all the \n postfixes make sure the buffer
  is put out.
  

• 9fa590a6
  by Zubin Duggal at 2025-07-17T06:07:03-04:00

  fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory
  
  Fixes #24093
  

• cc650b4b
  by Andrew Lelechenko at 2025-07-17T12:30:24-04:00

  Add Data.List.NonEmpty.mapMaybe
  
  As per https://github.com/haskell/core-libraries-committee/issues/337
  

• 360fa82c
  by Duncan Coutts at 2025-07-17T12:31:14-04:00

  base: Deprecate GHC.Weak.Finalize.runFinalizerBatch
  
  https://github.com/haskell/core-libraries-committee/issues/342
  

• f4e8466c
  by Alan Zimmerman at 2025-07-17T12:31:55-04:00

  EPA: Update exact printing based on GHC 9.14 tests
  
  As a result of migrating the GHC ghc-9.14 branch tests to
  ghc-exactprint in
  https://github.com/alanz/ghc-exactprint/tree/ghc-9.14, a couple of
  discrepancies were picked up
  
  - The opening paren for a DefaultDecl was printed in the wrong place
  - The import declaration level specifiers were not printed.
  
  This commit adds those fixes, and some tests for them.
  The tests brought to light that the ImportDecl ppr instance had not
  been updated for level specifiers, so it updates that too.
  

• 8b731e3c
  by Matthew Pickering at 2025-07-21T13:36:43-04:00

  level imports: Fix infinite loop with cyclic module imports
  
  I didn't anticipate that downsweep would run before we checked for
  cyclic imports. Therefore we need to use the reachability function which
  handles cyclic graphs.
  
  Fixes #26087
  

• d751a9f1
  by Pierre Thierry at 2025-07-21T13:37:28-04:00

  Fix documentation about deriving from generics
  

• f8d9d016
  by Andrew Lelechenko at 2025-07-22T21:13:28-04:00

  Fix issues with toRational for types capable to represent infinite and not-a-number values
  
  This commit fixes all of the following pitfalls:
  
  > toRational (read "Infinity" :: Double)
  179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216 % 1
  > toRational (read "NaN" :: Double)
  269653970229347386159395778618353710042696546841345985910145121736599013708251444699062715983611304031680170819807090036488184653221624933739271145959211186566651840137298227914453329401869141179179624428127508653257226023513694322210869665811240855745025766026879447359920868907719574457253034494436336205824 % 1
  
  > realToFrac (read "NaN" :: Double) -- With -O0
  Infinity
  > realToFrac (read "NaN" :: Double) -- With -O1
  NaN
  
  > realToFrac (read "NaN" :: Double) :: CDouble
  Infinity
  > realToFrac (read "NaN" :: CDouble) :: Double
  Infinity
  
  Implements https://github.com/haskell/core-libraries-committee/issues/338
  

• 5dabc718
  by Zubin Duggal at 2025-07-22T21:14:10-04:00

  haddock: Don't warn about missing link destinations for derived names.
  
  Fixes #26114
  

• 9c3a0937
  by Matthew Pickering at 2025-07-22T21:14:52-04:00

  template haskell: use a precise condition when implicitly lifting
  
  Implicit lifting corrects a level error by replacing references to `x`
  with `$(lift x)`, therefore you can use a level `n` binding at level `n
  + 1`, if it can be lifted.
  
  Therefore, we now have a precise check that the use level is 1 more than
  the bind level.
  
  Before this bug was not observable as you only had 0 and 1 contexts but
  it is easily evident when using explicit level imports.
  
  Fixes #26088
  

• 5144b22f
  by Andreas Klebinger at 2025-07-22T21:15:34-04:00

  Add since tag and more docs for do-clever-arg-eta-expansion
  
  Fixes #26113
  

• c865623b
  by Andreas Klebinger at 2025-07-22T21:15:34-04:00

  Add since tag for -fexpose-overloaded-unfoldings
  
  Fixes #26112
  

• 49a44ab7
  by Simon Hengel at 2025-07-23T17:59:55+07:00

  Refactor GHC.Driver.Errors.printMessages
  

• 84711c39
  by Simon Hengel at 2025-07-23T18:27:34+07:00

  Respect `-fdiagnostics-as-json` for error messages from pre-processors
  
  (fixes #25480)
  

• d046b5ab
  by Simon Hengel at 2025-07-24T06:12:05-04:00

  Include the rendered message in -fdiagnostics-as-json output
  
  This implements #26173.
  

• d2b89603
  by Ben Gamari at 2025-07-24T06:12:47-04:00

  rts/Interpreter: Factor out ctoi tuple info tables into data
  
  Instead of a massive case let's put this into data which we can reuse
  elsewhere.
  

• 4bc78496
  by Sebastian Graf at 2025-07-24T16:19:34-04:00

  CprAnal: Detect recursive newtypes (#25944)
  
  While `cprTransformDataConWork` handles recursive data con workers, it
  did not detect the case when a newtype is responsible for the recursion.
  This is now detected in the `Cast` case of `cprAnal`.
  
  The same reproducer made it clear that `isRecDataCon` lacked congruent
  handling for `AppTy` and `CastTy`, now fixed.
  
  Furthermore, the new repro case T25944 triggered this bug via an
  infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`.
  While it should be much less likely to trigger such an infinite loop now
  that `isRecDataCon` has been fixed, I made sure to abort the loop after
  10 iterations and emitting a warning instead.
  
  Fixes #25944.
  

• 0a583689
  by Sylvain Henry at 2025-07-24T16:20:26-04:00

  STM: don't create a transaction in the rhs of catchRetry# (#26028)
  
  We don't need to create a transaction for the rhs of (catchRetry#)
  because contrary to the lhs we don't need to abort it on retry. Moreover
  it is particularly harmful if we have code such as (#26028):
  
    let cN = readTVar vN >> retry
        tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...))
    atomically tree
  
  Because it will stack transactions for the rhss and the read-sets of all
  the transactions will be iteratively merged in O(n^2) after the
  execution of the most nested retry.
  

• a49eca26
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Renaming around predicate types
  
  .. we were (as it turned out) abstracting over
  type-class selectors in SPECIALISATION rules!
  
  Wibble isEqPred
  

• f80375dd
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Refactor of Specialise.hs
  
  This patch just tidies up `specHeader` a bit, removing one
  of its many results, and adding some comments.
  
  No change in behaviour.
  
  Also add a few more `HasDebugCallStack` contexts.
  

• 1bd12371
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Improve treatment of SPECIALISE pragmas -- again!
  
  This MR does another major refactor of the way that SPECIALISE
  pragmas work, to fix #26115, #26116, #26117.
  
  * We now /always/ solve forall-constraints in an all-or-nothing way.
    See Note [Solving a Wanted forall-constraint] in GHC.Tc.Solver.Solve
  
    This means we might have unsolved quantified constraints, which need
    to be reported.  See `inert_insts` in `getUnsolvedInerts`.
  
  * I refactored the short-cut solver for type classes to work by
    recursively calling the solver rather than by having a little baby
    solver that kept being not clever enough.
    See Note [Shortcut solving] in GHC.Tc.Solver.Dict
  
  * I totally rewrote the desugaring of SPECIALISE pragmas, again.
    The new story is in Note [Desugaring new-form SPECIALISE pragmas]
    in GHC.HsToCore.Binds
  
    Both old-form and new-form SPECIALISE pragmas now route through the same
    function `dsSpec_help`.   The tricky function `decomposeRuleLhs` is now used only
    for user-written RULES, not for SPECIALISE pragmas.
  
  * I improved `solveOneFromTheOther` to account for rewriter sets. Previously
    it would solve a non-rewritten dict from a rewritten one.  For equalities
    we were already dealing with this, in
  
  Some incidental refactoring
  
  * A small refactor: `ebv_tcvs` in `EvBindsBar` now has a list of coercions, rather
    than a set of tyvars.  We just delay taking the free vars.
  
  * GHC.Core.FVs.exprFVs now returns /all/ free vars.
    Use `exprLocalFVs` for Local vars.
    Reason: I wanted another variant for /evidence/ variables.
  
  * Ues `EvId` in preference to `EvVar`.  (Evidence variables are always Ids.)
    Rename `isEvVar` to `isEvId`.
  
  * I moved `inert_safehask` out of `InertCans` and into `InertSet` where it
    more properly belongs.
  
  Compiler-perf changes:
    * There was a palpable bug (#26117) which this MR fixes in
      newWantedEvVar, which bypassed all the subtle overlapping-Given
      and shortcutting logic.  (See the new `newWantedEvVar`.)  Fixing this
      but leads to extra dictionary bindings; they are optimised away quickly
      but they made CoOpt_Read allocate 3.6% more.
  
    * Hpapily T15164 improves.
  
    * The net compiler-allocation change is 0.0%
  
  Metric Decrease:
      T15164
  Metric Increase:
      CoOpt_Read
      T12425
  

• 953fd8f1
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Solve forall-constraints immediately, or not at all
  
  This MR refactors the constraint solver to solve forall-constraints immediately,
  rather than emitting an implication constraint to be solved later.
  
  The most immediate motivation was that when solving quantified constraints
  in SPECIALISE pragmas, we really really don't want to leave behind half-
  solved implications.  Also it's in tune with the approach of the new
  short-cut solver, which recursively invokes the solver.
  
  It /also/ saves quite a bit of plumbing; e.g
  
    - The `wl_implics` field of `WorkList` is gone,
  
    - The types of `solveSimpleWanteds` and friends are simplified.
  
    - An EvFun contains binding, rather than an EvBindsVar ref-cell that
      will in the future contain bindings.  That makes `evVarsOfTerm`
      simpler.  Much nicer.
  
  It also improves error messages a bit.
  
  All described in Note [Solving a Wanted forall-constraint] in
  GHC.Tc.Solver.Solve.
  
  One tiresome point: in the tricky case of `inferConstraintsCoerceBased`
  we make a forall-constraint.  This we /do/ want to partially solve, so
  we can infer a suitable context. (I'd be quite happy to force the user to
  write a context, bt I don't want to change behavior.)  So we want to generate
  an /implication/ constraint in `emitPredSpecConstraints` rather than a
  /forall-constraint/ as we were doing before.  Discussed in (WFA3) of
  the above Note.
  
  Incidental refactoring
  
  * `GHC.Tc.Deriv.Infer.inferConstraints` was consulting the state monad for
    the DerivEnv that the caller had just consulted.  Nicer to pass it as an
    argument I think, so I have done that.  No change in behaviour.
  

• 6921ab42
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Remove duplicated code in Ast.hs for evTermFreeVars
  
  This is just a tidy up.
  

• 1165f587
  by Simon Peyton Jones at 2025-07-25T09:49:58+01:00

  Small tc-tracing changes only
  

• 0776ffe0
  by Simon Hengel at 2025-07-26T04:54:20-04:00

  Respect `-fdiagnostics-as-json` for core diagnostics (see #24113)
  

• cc1116e0
  by Andrew Lelechenko at 2025-07-26T04:55:01-04:00

  docs: add since pragma to Data.List.NonEmpty.mapMaybe
  

• ee2dc248
  by Simon Hengel at 2025-07-31T06:25:35-04:00

  Update comments on `OptKind` to reflect the code reality
  

• b029633a
  by Wen Kokke at 2025-07-31T06:26:21-04:00

  rts: Disable --eventlog-flush-interval unless compiled with -threaded.
  
  This commit fixes issue #26222:
  Using --eventlog-flush-interval with the non-threaded RTS leads to eventlog corruption.
  https://gitlab.haskell.org/ghc/ghc/-/issues/26222
  
  This commit makes three changes when code is compiled against the non-threaded RTS:
  
  1. It disables the --eventlog-flush-interval flag.
  2. It disables the documentation for the --eventlog-flush-interval flag.
  3. It disables the relevant state from RtsConfig and code from Timer.
  4. It updates the entry for --eventlog-flush-interval in the users guide.
  

• 31159f1d
  by Wen Kokke at 2025-07-31T06:26:21-04:00

  rts: Split T20006 into tests with and without -threaded
  

• 618687ef
  by Simon Hengel at 2025-07-31T06:27:03-04:00

  docs/users_guide/win32-dlls.rst: Remove references to `readline`
  

• 083e40f1
  by Rodrigo Mesquita at 2025-08-01T04:38:23-04:00

  debugger: Uniquely identify breakpoints by internal id
  
  Since b85b11994e0130ff2401dd4bbdf52330e0bcf776 (support inlining
  breakpoints), a breakpoint has been identified at runtime by *two* pairs
  of <module,index>.
  
  - The first, aka a 'BreakpointId', uniquely identifies a breakpoint in
    the source of a module by using the Tick index. A Tick index can index
    into ModBreaks.modBreaks_xxx to fetch source-level information about
    where that tick originated.
  
      - When a user specifies e.g. a line breakpoint using :break, we'll reverse
        engineer what a Tick index for that line
      - We update the `BreakArray` of that module (got from the
        LoaderState) at that tick index to `breakOn`.
      - A BCO we can stop at is headed by a BRK_FUN instruction. This
        instruction stores in an operand the `tick index` it is associated
        to. We look it up in the associated `BreakArray` (also an operand)
        and check wheter it was set to `breakOn`.
  
  - The second, aka the `ibi_info_mod` + `ibi_info_ix` of the
    `InternalBreakpointId`, uniquely index into the `imodBreaks_breakInfo`
    -- the information we gathered during code generation about the
    existing breakpoint *ocurrences*.
  
    - Note that with optimisation there may be many occurrences of the
      same source-tick-breakpoint across different modules. The
      `ibi_info_ix` is unique per occurrence, but the `bi_tick_ix` may be
      shared. See Note [Breakpoint identifiers] about this.
  
    - Note that besides the tick ids, info ids are also stored in
      `BRK_FUN` so the break handler can refer to the associated
      `CgBreakInfo`.
  
  In light of that, the driving changes come from the desire to have the
  info_id uniquely identify the breakpoint at runtime, and the source tick
  id being derived from it:
  
  - An InternalBreakpointId should uniquely identify a breakpoint just
    from the code-generation identifiers of `ibi_info_ix` and `ibi_info_mod`.
    So we drop `ibi_tick_mod` and `ibi_tick_ix`.
  - A BRK_FUN instruction need only record the "internal breakpoint id",
    not the tick-level id.
    So we drop the tick mod and tick index operands.
  - A BreakArray should be indexed by InternalBreakpointId rather than
    BreakpointId
  
  That means we need to do some more work when setting a breakpoint.
  Specifically, we need to figure out the internal ids (occurrences of a
  breakpoint) from the source-level BreakpointId we want to set the
  breakpoint at (recall :break refers to breaks at the source level).
  
  Besides this change being an improvement to the handling of breakpoints
  (it's clearer to have a single unique identifier than two competing
  ones), it unlocks the possibility of generating "internal" breakpoints
  during Cg (needed for #26042).
  It should also be easier to introduce multi-threaded-aware `BreakArrays`
  following this change (needed for #26064).
  
  Se also the new Note [ModBreaks vs InternalModBreaks]
  
  On i386-linux:
  
  -------------------------
  Metric Decrease:
      interpreter_steplocal
  -------------------------
  

• bf03bbaa
  by Simon Hengel at 2025-08-01T04:39:05-04:00

  Don't use MCDiagnostic for `ghcExit`
  
  This changes the error message of `ghcExit` from
  
  ```
  <no location info>: error:
  Compilation had errors
  
  ```
  to
  ```
  
  Compilation had errors
  
  ```
  

• a889ec75
  by Simon Hengel at 2025-08-01T04:39:05-04:00

  Respect `-fdiagnostics-as-json` for driver diagnostics (see #24113)
  

• 81577fe7
  by Ben Gamari at 2025-08-02T04:29:39-04:00

  configure: Allow override of CrossCompiling
  
  As noted in #26236, the current inference logic is a bit simplistic. In
  particular, there are many cases (e.g. building for a new libc) where
  the target and host triples may differ yet we are still able to run the
  produced artifacts as native code.
  
  Closes #26236.
  

• 01136779
  by Andreas Klebinger at 2025-08-02T04:30:20-04:00

  rts: Support COFF BigObj files in archives.
  

• 1f9e4f54
  by Stephen Morgan at 2025-08-03T15:14:08+10:00

  refactor: Modify Data.List.sortOn to use (>) instead of compare. (#26184)
  
  This lets a more efficient (>) operation be used if one exists.
  
  This is technically a breaking change for malformed Ord instances, where
  x > y is not equivalent to compare x y == GT.
  
  Discussed by the CLC in issue #332: https://github.com/haskell/core-libraries-committee/issues/332
  

• 4f6bc9cf
  by fendor at 2025-08-04T17:50:06-04:00

  Revert "base: Expose Backtraces constructor and fields"
  
  This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57.
  

• bcdec657
  by Zubin Duggal at 2025-08-05T10:37:29+05:30

  compiler: Export a version of `newNameCache` that is not prone to footguns.
  `newNameCache` must be initialized with both a non-"reserved" unique tag, as well
  as a list of known key names. Failing to do so results in hard to debug unique conflicts.
  
  It is difficult for API users to tell which unique tags are safe to use. So instead of leaving
  this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed
  non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations
  of the compiler.
  
  The original version of `newNameCache` is now exported as `newNameCache'` for advanced users.
  
  We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in
  functionality by `newNameCache` and `newNameCache'`.
  
  Fixes #26135 and #26055
  

• 57d3b4a8
  by Andrew Lelechenko at 2025-08-05T18:36:31-04:00

  hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2
  
  In line with #25693 we should use GHC 9.10 as a boot compiler,
  while Hadrian stack.yaml was stuck on GHC 9.6.
  

• c2a78cea
  by Peng Fan at 2025-08-05T18:37:27-04:00

  NCG/LA64: implement atomic write with finer-grained DBAR hints
  
  Signed-off-by: Peng Fan <fanpeng@loongson.cn>
  

• 95231c8e
  by Teo Camarasu at 2025-08-06T08:35:58-04:00

  CODEOWNERS: add CLC as codeowner of base
  
  We also remove hvr, since I think he is no longer active

• 77df0ded
  by Andrew Lelechenko at 2025-08-06T08:36:39-04:00

  Bump submodule text to 2.1.3
  

• 8af260d0
  by Nikolaos Chatzikonstantinou at 2025-08-06T08:37:23-04:00

  docs: fix internal import in getopt examples
  
  This external-facing doc example shouldn't mention GHC internals when
  using 'fromMaybe'.
  

• 69cc16ca
  by Marc Scholten at 2025-08-06T15:51:28-04:00

  README: Add note on ghc.nix
  

• 93a2f450
  by Daniel Díaz at 2025-08-06T15:52:14-04:00

  Link to the "Strict Bindings" docs from the linear types docs
  
  Strict Bidings are relevant for the kinds of multiplicity annotations
  linear lets support.
  

• 246b7853
  by Matthew Pickering at 2025-08-07T06:58:30-04:00

  level imports: Check the level of exported identifiers
  
  The level imports specification states that exported identifiers have to
  be at level 0. This patch adds the requird level checks that all
  explicitly mentioned identifiers occur at level 0.
  
  For implicit export specifications (T(..) and module B), only level 0
  identifiers are selected for re-export.
  
  ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705
  
  Fixes #26090
  

• 358bc4fc
  by fendor at 2025-08-07T06:59:12-04:00

  Bump GHC on darwin CI to 9.10.1
  

• 1903ae35
  by Matthew Pickering at 2025-08-07T12:21:10+01:00

  ipe: Place strings and metadata into specific .ipe section
  
  By placing the .ipe metadata into a specific section it can be stripped
  from the final binary if desired.
  
  ```
  objcopy --remove-section .ipe <binary>
  upx <binary>
  ```
  
  Towards #21766
  

• c80dd91c
  by Matthew Pickering at 2025-08-07T12:22:42+01:00

  ipe: Place magic word at the start of entries in the .ipe section
  
  The magic word "IPE\nIPE\n" is placed at the start of .ipe sections,
  then if the section is stripped, we can check whether the section starts
  with the magic word or not to determine whether there is metadata
  present or not.
  
  Towards #21766
  

• cab42666
  by Matthew Pickering at 2025-08-07T12:22:42+01:00

  ipe: Use stable IDs for IPE entries
  
  IPEs have historically been indexed and reported by their address.
  This makes it impossible to compare profiles between runs, since the
  addresses may change (due to ASLR) and also makes it tricky to separate
  out the IPE map from the binary.
  
  This small patch adds a stable identifier for each IPE entry.
  
  The stable identifier is a single 64 bit word. The high-bits are a
  per-module identifier and the low bits identify which entry in each
  module.
  
  1. When a node is added into the IPE buffer it is assigned a unique
     identifier from an incrementing global counter.
  2. Each entry already has an index by it's position in the
     `IpeBufferListNode`.
  
  The two are combined together by the `IPE_ENTRY_KEY` macro.
  
  Info table profiling uses the stable identifier rather than the address
  of the info table.
  
  The benefits of this change are:
  
  * Profiles from different runs can be easily compared
  * The metadata can be extracted from the binary (via the eventlog for
    example) and then stripped from the executable.
  
  Fixes #21766
  

• 2860a9a5
  by Simon Peyton Jones at 2025-08-07T20:29:18-04:00

  In TcSShortCut, typechecker plugins should get empty Givens
  
  Solving in TcShortCut mode means /ignoring the Givens/. So we
  should not pass them to typechecker plugins!
  
  Fixes #26258.
  
  This is a fixup to the earlier MR:
  
      commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06
      Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
      Date:   Mon Jul 21 10:04:49 2025 +0100
  
          Improve treatment of SPECIALISE pragmas -- again!
  

• 2157db2d
  by sterni at 2025-08-08T15:32:39-04:00

  hadrian: enable terminfo if --with-curses-* flags are given
  
  The GHC make build system used to support WITH_TERMINFO in ghc.mk which
  allowed controlling whether to build GHC with terminfo or not. hadrian
  has replaced this with a system where this is effectively controlled by
  the cross-compiling setting (the default WITH_TERMINFO value was bassed
  on CrossCompiling, iirc).
  
  This behavior is undesireable in some cases and there is not really a
  good way to work around it. Especially for downstream packagers,
  modifying this via UserSettings is not really feasible since such a
  source file has to be kept in sync with Settings/Default.hs manually
  since it can't import Settings.Default or any predefined Flavour
  definitions.
  
  To avoid having to add a new setting to cfg/system.config and/or a new
  configure flag (though I'm happy to implement both if required), I've
  chosen to take --with-curses-* being set explicitly as an indication
  that the user wants to have terminfo enabled. This would work for
  Nixpkgs which sets these flags [1] as well as haskell.nix [2] (which
  goes to some extreme measures [3] [4] to force terminfo in all scenarios).
  
  In general, I'm an advocate for making the GHC build be the same for
  native and cross insofar it is possible since it makes packaging GHC and
  Haskell related things while still supporting cross much less
  compilicated. A more minimal GHC with reduced dependencies should
  probably be a specific flavor, not the default.
  
  Partially addresses #26288 by forcing terminfo to be built if the user
  explicitly passes configure flags related to it. However, it isn't built
  by default when cross-compiling yet nor is there an explicit way to
  control the package being built.
  
  [1]: https://github.com/NixOS/nixpkgs/blob/3a7266fcefcb9ce353df49ba3f292d06443760bb/pkgs/development/compilers/ghc/common-hadrian.nix#L513-L515
  [2]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4f74d2cc85700042b/compiler/ghc/default.nix#L185
  [3]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4f74d2cc85700042b/compiler/ghc/default.nix#L678-L682
  [4]: https://github.com/input-output-hk/haskell.nix/blob/6eaafcdf04bab7be745d1aa4f74d2cc85700042b/compiler/ghc/default.nix#L772-L773
  

• b3c31488
  by David Feuer at 2025-08-08T15:33:21-04:00

  Add default QuasiQuoters
  
  Add `defaultQuasiQuoter` and `namedDefaultQuasiQuoter` to make it easier
  to write `QuasiQuoters` that give helpful error messages when they're
  used in inappropriate contexts.
  
  Closes #24434.
  

• 03555ed8
  by Sylvain Henry at 2025-08-10T22:20:57-04:00

  Handle non-fractional CmmFloats in Cmm's CBE (#26229)
  
  Since f8d9d016305be355f518c141f6c6d4826f2de9a2, toRational for Float and
  Double converts float's infinity and NaN into Rational's infinity and
  NaN (respectively 1%0 and 0%0).
  
  Cmm CommonBlockEliminator hashing function needs to take these values
  into account as they can appear as literals now. See added testcase.
  

• 6c956af3
  by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00

  Fix extensions list in `DoAndIfThenElse` docs
  

• 6dc420b1
  by J. Ryan Stinnett at 2025-08-10T22:21:42-04:00

  Document status of `RelaxedPolyRec` extension
  
  This adds a brief extension page explaining the status of the
  `RelaxedPolyRec` extension. The behaviour of this mode is already
  explained elsewhere, so this page is mainly for completeness so that
  various lists of extensions have somewhere to point to for this flag.
  
  Fixes #18630
  

• 18036d52
  by Simon Peyton Jones at 2025-08-11T11:31:20-04:00

  Take more care in zonkEqTypes on AppTy/AppTy
  
  This patch fixes #26256.
  
  See Note [zonkEqTypes and the PKTI] in GHC.Tc.Solver.Equality
  

• c8d76a29
  by Zubin Duggal at 2025-08-11T11:32:02-04:00

  ci: upgrade bootstrap compiler on windows to 9.10.1
  

• 34fc50c1
  by Ben Gamari at 2025-08-11T13:36:25-04:00

  Kill IOPort#
  
  This type is unnecessary, having been superceded by `MVar` and a rework
  of WinIO's blocking logic.
  
  See #20947.
  
  See https://github.com/haskell/core-libraries-committee/issues/213.
  

• 56b32c5a
  by sheaf at 2025-08-12T10:00:19-04:00

  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.
  
  For example, we now are properly able to prove the subtyping relationship
  
    ((∀ a. a->a) -> Int) -> Bool  <=  β[tau] Bool
  
  for an unfilled metavariable β. In this case (with an AppTy on the right),
  we used to fall back to unification. No longer: now, given that the LHS
  is a FunTy and that the RHS is a deep rho type (does not need any instantiation),
  we try to make the RHS into a FunTy, viz.
  
    β := (->) γ
  
  We can then continue using covariance & contravariance of the function
  arrow, which allows us to prove the subtyping relationship, instead of
  trying to unify which would cause us to error out with:
  
    Couldn't match expected type ‘β’ with actual type ‘(->) ((∀ a. a -> a) -> Int)
  
  See Note [FunTy vs non-FunTy case in tc_sub_type_deep] in GHC.Tc.Utils.Unify.
  
  The other main improvement in this patch concerns type inference.
  The main subsumption logic happens (before & after this patch) in
  GHC.Tc.Gen.App.checkResultTy. However, before this patch, all of the
  DeepSubsumption logic only kicked in in 'check' mode, not in 'infer' mode.
  
  This patch adds deep instantiation in the 'infer' mode of checkResultTy
  when we are doing deep subsumption, which allows us to accept programs
  such as:
  
    f :: Int -> (forall a. a->a)
    g :: Int -> Bool -> Bool
  
    test1 b =
      case b of
        True  -> f
        False -> g
    test2 b =
      case b of
        True  -> g
        False -> f
  
  See Note [Deeply instantiate in checkResultTy when inferring].
  
  Finally, we add representation-polymorphism checks to ensure that the
  lambda abstractions we introduce when doing subsumption obey the
  representation polymorphism invariants of Note [Representation polymorphism invariants]
  in GHC.Core. See Note [FunTy vs FunTy case in tc_sub_type_deep].
  This is accompanied by a courtesy change to `(<.>) :: HsWrapper -> HsWrapper -> HsWrapper`,
  adding the equation:
  
    WpCast c1 <.> WpCast c2 = WpCast (c1 `mkTransCo` c2)
  
  This is useful because mkWpFun does not introduce an eta-expansion when
  both of the argument & result wrappers are casts; so this change allows
  us to avoid introducing lambda abstractions when casts suffice.
  
  Fixes #26225
  

• d175aff8
  by Sylvain Henry at 2025-08-12T10:01:31-04:00

  Add regression test for #18619
  

• a3983a26
  by Sylvain Henry at 2025-08-12T10:02:20-04:00

  RTS: remove some TSAN annotations (#20464)
  
  Use RELAXED_LOAD_ALWAYS macro instead.
  

• 0434af81
  by Ben Gamari at 2025-08-12T10:03:02-04:00

  Bump time submodule to 1.15
  
  Also required bumps of Cabal, directory, and hpc.
  

• 62899117
  by Florian Ragwitz at 2025-08-13T21:01:34-04:00

  Extend record-selector usage ticking to all binds using a record field
  
  This extends the previous handling of ticking for RecordWildCards and
  NamedFieldPuns to all var bindings that involve record selectors.
  
  Note that certain patterns such as `Foo{foo = 42}` will currently not tick the
  `foo` selector, as ticking is triggered by `HsVar`s.
  
  Closes #26191.
  

• b37b3af7
  by Florian Ragwitz at 2025-08-13T21:01:34-04:00

  Add release notes for 9.16.1 and move description of latest HPC changes there.
  

• a5e4b7d9
  by Ben Gamari at 2025-08-13T21:02:18-04:00

  rts: Clarify rationale for undefined atomic wrappers
  
  Since c06e3f46d24ef69f3a3d794f5f604cb8c2a40cbc the RTS has declared
  various atomic operation wrappers defined by ghc-internal as undefined.
  While the rationale for this isn't clear from the commit message, I
  believe that this is necessary due to the unregisterised backend.
  Specifically, the code generator will reference these symbols when
  compiling RTS Cmm sources.
  

• 50842f83
  by Andreas Klebinger at 2025-08-13T21:03:01-04:00

  Make unexpected LLVM versions a warning rather than an error.
  
  Typically a newer LLVM version *will* work so erroring out if
  a user uses a newer LLVM version is too aggressive.
  
  Fixes #25915
  

• c91e2650
  by fendor at 2025-08-13T21:03:43-04:00

  Store `StackTrace` and `StackSnapshot` in `Backtraces`
  
  Instead of decoding the stack traces when collecting the `Backtraces`,
  defer this decoding until actually showing the `Backtraces`.
  This allows users to customise how `Backtraces` are displayed by
  using a custom implementation of `displayExceptionWithInfo`, overwriting
  the default implementation for `Backtraces` (`displayBacktraces`).
  

• dee28cdd
  by fendor at 2025-08-13T21:03:43-04:00

  Allow users to customise the collection of exception annotations
  
  Add a global `CollectExceptionAnnotationMechanism` which determines how
  `ExceptionAnnotation`s are collected upon throwing an `Exception`.
  
  This API is exposed via `ghc-experimental`.
  
  By overriding how we collect `Backtraces`, we can control how the
  `Backtraces` are displayed to the user by newtyping `Backtraces` and
  giving a different instance for `ExceptionAnnotation`.
  
  A concrete use-case for this feature is allowing us to experiment with
  alternative stack decoders, without having to modify `base`, which take
  additional information from the stack frames.
  
  This commit does not modify how `Backtraces` are currently
  collected or displayed.
  

• 66024722
  by fendor at 2025-08-13T21:03:43-04:00

  Expose Backtraces internals from ghc-experimental
  
  Additionally, expose the same API `base:Control.Exception.Backtrace`
  to make it easier to use as a drop-in replacement.
  

• a766286f
  by Reed Mullanix at 2025-08-13T21:04:36-04:00

  ghc-internal: Fix naturalAndNot for NB/NS case
  
  When the first argument to `naturalAndNot` is larger than a `Word` and the second is `Word`-sized, `naturalAndNot` will truncate the
  result:
  
  ```
  >>> naturalAndNot ((2 ^ 65) .|. (2 ^ 3)) (2 ^ 3)
  0
  ```
  
  In contrast, `naturalAndNot` does not truncate when both arguments are larger than a `Word`, so this appears to be a bug.
  Luckily, the fix is pretty easy: we just need to call `bigNatAndNotWord#` instead of truncating.
  
  Fixes #26230
  

• 3506fa7d
  by Simon Hengel at 2025-08-13T21:05:18-04:00

  Report -pgms as a deprecated flag
  
  (instead of reporting an unspecific warning)
  
  Before:
  
      on the commandline: warning:
          Object splitting was removed in GHC 8.8
  
  After:
  
      on the commandline: warning: [GHC-53692] [-Wdeprecated-flags]
          -pgms is deprecated: Object splitting was removed in GHC 8.8
  

• 51c701fe
  by Zubin Duggal at 2025-08-13T21:06:00-04:00

  testsuite: Be more permissive when filtering out GNU_PROPERTY_TYPE linker warnings
  
  The warning text is slightly different with ld.bfd.
  
  Fixes #26249
  

• dfe6f464
  by Simon Hengel at 2025-08-13T21:06:43-04:00

  Refactoring: Don't misuse `MCDiagnostic` for lint messages
  
  `MCDiagnostic` is meant to be used for compiler diagnostics.
  
  Any code that creates `MCDiagnostic` directly, without going through
  `GHC.Driver.Errors.printMessage`, side steps `-fdiagnostics-as-json`
  (see e.g. !14475, !14492 !14548).
  
  To avoid this in the future I want to control more narrowly who creates
  `MCDiagnostic` (see #24113).
  
  Some parts of the compiler use `MCDiagnostic` purely for formatting
  purposes, without creating any real compiler diagnostics.  This change
  introduces a helper function, `formatDiagnostic`, that can be used in
  such cases instead of constructing `MCDiagnostic`.
  

• a8b2fbae
  by Teo Camarasu at 2025-08-13T21:07:24-04:00

  rts: ensure MessageBlackHole.link is always a valid closure
  
  We turn a MessageBlackHole into an StgInd in wakeBlockingQueue().
  Therefore it's important that the link field, which becomes the
  indirection field, always points to a valid closure.
  
  It's unclear whether it's currently possible for the previous behaviour
  to lead to a crash, but it's good to be consistent about this invariant nonetheless.
  
  Co-authored-by: Andreas Klebinger <klebinger.andreas@gmx.at>
  

• 4021181e
  by Teo Camarasu at 2025-08-13T21:07:24-04:00

  rts: spin if we see a WHITEHOLE in messageBlackHole
  
  When a BLACKHOLE gets cancelled in raiseAsync, we indirect to a THUNK.
  GC can then shortcut this, replacing our BLACKHOLE with a fresh THUNK.
  
  This THUNK is not guaranteed to have a valid indirectee field.
  
  If at the same time, a message intended for the previous BLACKHOLE is
  processed and concurrently we BLACKHOLE the THUNK, thus temporarily
  turning it into a WHITEHOLE, we can get a segfault, since we look at the
  undefined indirectee field of the THUNK
  
  The fix is simple: spin if we see a WHITEHOLE, and it will soon be
  replaced with a valid BLACKHOLE.
  
  Resolves #26205
  

• 1107af89
  by Oleg Grenrus at 2025-08-13T21:08:06-04:00

  Allow defining HasField instances for naughty fields
  
  Resolves #26295
  
  ... as HasField solver doesn't solve for fields with "naughty"
  selectors, we could as well allow defining HasField instances for these
  fields.
  

• 020e7587
  by Sylvain Henry at 2025-08-13T21:09:00-04:00

  Fix Data.List unqualified import warning
  

• fd811ded
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Make injecting implicit bindings into its own pass
  
  Previously we were injecting "impliicit bindings" (data constructor
  worker and wrappers etc)
  
    - both at the end of CoreTidy,
    - and at the start of CorePrep
  
  This is unpleasant and confusing.  This patch puts it it its own pass,
  addImplicitBinds, which runs between the two.
  
  The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/
  TyCons, not just the ones for algebraic data types.  That change ripples
  through to
       - corePrepPgm
       - doCodeGen
       - byteCodeGen
  All take [TyCon] which includes all TyCons
  

• 9bd7fcc5
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Implement unary classes
  
  The big change is described exhaustively in
  
     Note [Unary class magic] in GHC.Core.TyCon
  
  Other changes
  
  * We never unbox class dictionaries in worker/wrapper.  This has been true for some
    time now, but the logic is now centralised in functions in
    GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg`
    See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils.
  
  * Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels.
    I can't remember if I actually changed any behaviour here, but if so it's
    only in a corner cases.
  
  * Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning
    True for (##).
  
  * Remove redundant Role argument to `liftCoSubstWithEx`.  It was always
    Representational.
  
  * I refactored evidence generation in the constraint solver:
    * Made GHC.Tc.Types.Evidence contain better abstactions for evidence
      generation.
    * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents
      elsewhere. It wasn't paying its way.
    * Made evidence for implicit parameters go via a proper abstraction.
  
  * Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk]
    This fixes a slowdown in `countdownEffectfulDynLocal`
    in the `effectful` library.
  
  Smaller things
  
  * Rename `isDataTyCon` to `isBoxedDataTyCon`.
  * GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role,
    so I baked that into the function and removed the argument.
  * Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling
    `not isNewTyCon` at the call sites; more explicit.
  * Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its
    behaviour
  * Moved `decomposeIPPred` to GHC.Core.Predicate
  
  Compile time performance changes:
    geo. mean        +0.1%
      minimum        -6.8%
      maximum       +14.4%
  
  The +14% one is in T21839c, where it seems that a bit more inlining
  is taking place.  That seems acceptable; and the average change is small
  
  Metric Decrease:
      LargeRecord
      T12227
      T12707
      T16577
      T21839r
      T5642
  Metric Increase:
      T15164
      T21839c
      T3294
      T5321FD
      T5321Fun
      WWRec
  

• b4075d71
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Slight improvement to pre/postInlineUnconditionally
  
  Avoids an extra simplifier iteration
  

• 9e443596
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Fix a long-standing assertion error in normSplitTyConApp_maybe
  

• 91310ad0
  by Simon Peyton Jones at 2025-08-14T17:56:47-04:00

  Add comment to coercion optimiser
  

• 5b841d82
  by Teo Camarasu at 2025-08-14T17:57:56-04:00

  template-haskell: move some identifiers from ghc-internal to template-haskell
  
  These identifiers are not used internally by the compiler. Therefore we
  have no reason for them to be in ghc-internal.
  
  By moving them to template-haskell, we benefit from it being easier to
  change them and we avoid having to build them in stage0.
  
  Resolves #26048
  

• 33e2c7e5
  by Teo Camarasu at 2025-08-14T17:57:56-04:00

  template-haskell: transfer $infix note to public module
  
  This Haddock note should be in the public facing module
  

• 2a411fc4
  by Sylvain Henry at 2025-08-14T17:59:09-04:00

  JS: export HEAP8 symbol (#26290)
  
  Newer Emscripten requires this.
  

• 248f78ca
  by Ben Gamari at 2025-08-14T17:59:51-04:00

  users-guide: Drop the THREAD_RUNNABLE event
  
  As of f361281c89fbce42865d8b8b27b0957205366186 it is no longer emitted.

• 706d33e3
  by Recursion Ninja at 2025-08-15T04:12:12-04:00

  Resolving issues #20645 and #26109
  
  Correctly sign extending and casting smaller bit width types for LLVM operations:
  
    - bitReverse8#
    - bitReverse16#
    - bitReverse32#
    - byteSwap16#
    - byteSwap32#
    - pdep8#
    - pdep16#
    - pext8#
    - pext16#
  

• 1cdc6f46
  by Cheng Shao at 2025-08-15T04:12:56-04:00

  hadrian: enforce have_llvm=False for wasm32/js
  
  This patch fixes hadrian to always pass have_llvm=False to the
  testsuite driver for wasm32/js targets. These targets don't really
  support the LLVM backend, and the optllvm test way doesn't work. We
  used to special-case wasm32/js to avoid auto-adding optllvm way in
  testsuite/config/ghc, but this is still problematic if someone writes
  a new LLVM-related test and uses something like when(have_llvm(),
  extra_ways(["optllvm"])). So better just enforce have_llvm=False for
  these targets here.
  

• ca03226d
  by Ben Gamari at 2025-08-18T13:43:20+00:00

  configure: Allow use of LLVM 20

• 783cd7d6
  by Cheng Shao at 2025-08-18T20:13:14-04:00

  compiler: use `UniqMap` instead of `Map` for `BCEnv` in bytecode compiler
  
  The bytecode compiler maintains a `BCEnv` which was previously `Map Id
  StackDepth`. Given `Id` is `Uniquable`, we might as well use `UniqMap`
  here as a more efficient data structure, hence this patch.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 58e46da9
  by fendor at 2025-08-18T20:13:56-04:00

  rts: Strip lower three bits when hashing Word instead of lower eight bits
  

• 45dbfa23
  by Cheng Shao at 2025-08-18T20:14:37-04:00

  libffi: update to 3.5.2
  
  Bumps libffi submodule.
  

• 54be78ef
  by Ben Gamari at 2025-08-19T16:28:05-04:00

  testsuite: Fix T20006b
  
  This test is supposed to fail for non-threaded ways yet it
  was previously marked as only failing in `normal`.
  Fix this.

• f4bac607
  by Simon Peyton Jones at 2025-08-19T16:28:47-04:00

  Take yet more care with reporting redundant constraints
  
  This small patch fixes #25992, which relates to reporting redundant
  constraints on default-method declarations.
  
  See (TRC5) in Note [Tracking redundant constraints]
  

• ab130fec
  by fendor at 2025-08-19T16:29:29-04:00

  Bump dependencies of hadrian-bootstrap-gen to use GHC 9.6.7
  

• 6d02ac6f
  by fendor at 2025-08-19T16:29:29-04:00

  Bump required GHC version for test-bootstrap jobs to 9.10.1
  
  Include test-bootstrap job for GHC 9.12.2.
  
  Update hadrian bootstrap plans use GHC 9.10 and 9.12
  
  Remove older GHC bootstrap configurations.
  We require at least GHC 9.10.1 to build GHC.
  
  Adds plans for:
  
  * 9.10.1
  * 9.10.2
  * 9.12.1
  * 9.12.2
  

• 9e857171
  by Brandon Chinn at 2025-08-20T11:47:46-04:00

  Don't warn unused-imports with used generated imports
  
  Fixes #21730
  
  * The old notion of "implicit" import has been renamed to "generated". See Note [Generated imports] in GHC.Hs.ImpExp.
  
  * ImportMap now keeps track of generated and user-written imports separately. This avoids the fake SrcSpan we used to give the implicit Prelude import, and the hack that went with it.
  
  * -ddump-minimal-imports now considers generated imports (but still only
    warns on + prints user-written imports)
  
  * bestImport considers generated imports to take priority over user-written imports.
  

• 9fb3bad4
  by Ben Gamari at 2025-08-20T11:48:31-04:00

  mailmap: Use ben@well-typed.com more liberally
  
  Nearly all of this work was done while working for Well-Typed.
  

• 774fec37
  by Ben Gamari at 2025-08-20T11:49:15-04:00

  Add primop to annotate the call stack with arbitrary data
  
  We introduce a new primop `annotateStack#` which allows us to push
  arbitrary data onto the call-stack.
  This allows us to extract the data later when decoding the stack, for
  example when an exception is thrown, showing more information to the
  user without having to annotate the full call-stack with `HasCallStack`
  constraints.
  
  A new stack frame value is introduced `AnnFrame`, which consists of
  nothing but a generic payload.
  
  The primop has a small wrapper API that allows users to annotate their
  call-stack in programs.
  There is a pure API and an IO-based one. The former is a little bit
  dubious, as it affects the evaluation of a program, so use with care.
  The latter is "safe", as it doesn't change the evaluation of the
  program.
  
  The stack annotation mechanism is similarly implemented to the
  `ExceptionAnnotation` and `Exception`, there is a typeclass to indicate
  something can be pushed onto the call-stack and all values are wrapped
  in the existential `SomeStackAnnotation`, which recover the type of the
  annotation payload.
  
  There is currently no builtin way to show the stack annotations when
  `Backtraces` are displayed (i.e., when showing stack traces to the user),
  which we will address in a follow-up MR.
  
  -------------------------
  Metric Increase:
      ghc_experimental_so
  -------------------------
  
  We increase the size of the package, so this is not unreasonable.
  
  Co-Authored-By: fendor <fendor@posteo.de>
  Co-Authored-By: Ben Gamari <bgamari.foss@gmail.com>
  

• fdfa3892
  by Ben Gamari at 2025-08-20T11:49:57-04:00

  testsuite: Add regression test for #24606
  

• 39b2e382
  by Cheng Shao at 2025-08-20T11:50:40-04:00

  compiler: only use `Name` instead of `Id` in `SptEntry`
  
  As a part of #26298, this patch refactors `SptEntry` to only carry a
  `Name` instead of `Id`: we do not care about extra information like
  caffyness or type at all in any static pointer related codegen logic.
  This is necessary to make `SptEntry` serializable, as a part of the
  grand plan of serializable bytecode.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 276f8ea8
  by Vekhir -- at 2025-08-20T11:51:35-04:00

  Bump Cabal dependency

• 0b9c7437
  by Zubin Duggal at 2025-08-20T11:52:18-04:00

  ci: Teach ci.sh to fetch FreeBSD artifacts from ghcup unofficial bindists and bootstrap compiler on FreeBSD to 9.10.1
  
  Also refactor fetch_ghc logic in ci.sh, renaming the GHC_VERSION enviorment configuration variable to FETCH_GHC_VERSION,
  making it clear that it is intended for use on platforms like Windows and FreeBSD where we don't want to use the GHC
  excecutable from the platform environment and instead need to download and install GHC-$FETCH_GHC_VERSION from a release
  bindist.
  
  Fixes #26296
  

• b2914797
  by Cheng Shao at 2025-08-20T11:53:00-04:00

  driver: use UniqSet for hiddenModules in DynFlags/FinderOpts
  
  This patch replaces Set ModuleName with UniqSet ModuleName in
  DynFlags.hiddenModules and FinderOpts.finder_hiddenModules for
  improved efficiency.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 0335d899
  by Cheng Shao at 2025-08-20T11:53:00-04:00

  driver: use UniqMap ModuleName in the finder
  
  This patch replaces Map ModuleName with UniqMap ModuleName in the
  finder for improved efficiency.
  
  Co-authored-by: Codex <codex@openai.com>
  

• 91f4faaa
  by Cheng Shao at 2025-08-20T11:53:43-04:00

  configure: check python3 version and require minimal 3.7
  
  Since !9515, the testsuite driver requires python3 version to be at
  least 3.7, though this has never been checked by configure logic. This
  patch implements the version check. Fixes #23234.
  
  Co-authored-by: Codex <codex@openai.com>
  

• df4ee9b4
  by Cheng Shao at 2025-08-20T11:54:25-04:00

  compiler: use zero cost coerce in GHC.CmmToAsm.CFG.loopInfo
  
  This patch refactors GHC.CmmToAsm.CFG.loopInfo to use zero cost coerce
  and thus addresses the TODO. For coerce to work, constructors of
  Label/LabelMap/LabelSet from GHC.Cmm.Dataflow.Label are exposed,
  though I believe it's a worthy tradeoff to avoid unnecessary runtime
  cost without using unsafeCoerce, since the latter could be a landmine
  for future refactoring.
  
  Co-authored-by: Codex <codex@openai.com>
  

• ccda188d
  by Simon Peyton Jones at 2025-08-20T11:55:07-04:00

  Start with empty inerts in shortcut solving
  
  When short-cut solving we were starting with an inert set that had
  unsolved Wanteds.  This caused an infinite loop (#26314), because a
  typechecker plugin kept being given that unsolved Wanted.
  
  It's better just to start with an empty inert set
  

• c8882ed7
  by Ben Gamari at 2025-08-20T11:55:49-04:00

  configure: Bump minimal bootstrap GHC version to 9.8

• f0a19d74
  by fendor at 2025-08-20T19:55:00-04:00

  Remove deprecated functions from the ghci package
  

• ebeb991b
  by fendor at 2025-08-20T19:55:00-04:00

  base: Remove unstable heap representation details from GHC.Exts
  

• e368e247
  by Rodrigo Mesquita at 2025-08-20T19:55:42-04:00

  bytecode: Use 32bits for breakpoint index
  
  Fixes #26325
  

• 42724462
  by Simon Hengel at 2025-08-21T17:52:11-04:00

  Serialize wired-in names as external names when creating HIE files
  
  Note that the domain of de-serialized names stays the same.
  Specifically, for known-key names, before `lookupKnownKeyName` was used,
  while now this is handled by `lookupOrigNameCache` which captures the
  same range provided that the OrigNameCache has been initialized with
  `knownKeyNames` (which is the case by default).
  
  (fixes #26238)
  

• 6a43f8ec
  by Cheng Shao at 2025-08-21T17:52:52-04:00

  compiler: fix closure C type in SPT init code
  
  This patch fixes the closure C type in SPT init code to StgClosure,
  instead of the previously incorrect StgPtr. Having an incorrect C type
  makes SPT init code not compatible with other foreign stub generation
  logic, which may also emit their own extern declarations for the same
  closure symbols and thus will clash with the incorrect prototypes in
  SPT init code.
  

• 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.
  

• c5abacfa
  by Cheng Shao at 2025-09-12T09:55:22+02:00

  compiler: move Binary instance of Map to GHC.Utils.Binary
  
  This patch moves `Binary` instance of `Map` from `haddock-api` to
  `GHC.Utils.Binary`. This also allows us to remove a redundant instance
  defined for `NameEntityInfo`, which is a type synonym for `Map`.
  

1017 changed files:

• .gitlab-ci.yml
• .gitlab/ci.sh
• .gitlab/common.sh
• .gitlab/darwin/toolchain.nix
• .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
• .mailmap
• CODEOWNERS
• README.md
• compiler/GHC.hs
• compiler/GHC/Builtin/Names.hs
• compiler/GHC/Builtin/Names/TH.hs
• compiler/GHC/Builtin/PrimOps/Ids.hs
• compiler/GHC/Builtin/Types.hs
• compiler/GHC/Builtin/Types/Prim.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• + compiler/GHC/ByteCode/Breakpoints.hs
• compiler/GHC/ByteCode/InfoTable.hs
• compiler/GHC/ByteCode/Instr.hs
• compiler/GHC/ByteCode/Linker.hs
• compiler/GHC/ByteCode/Types.hs
• compiler/GHC/Cmm.hs
• compiler/GHC/Cmm/CommonBlockElim.hs
• compiler/GHC/Cmm/Dataflow/Label.hs
• compiler/GHC/CmmToAsm/CFG.hs
• compiler/GHC/CmmToAsm/LA64/CodeGen.hs
• compiler/GHC/CmmToAsm/LA64/Instr.hs
• compiler/GHC/CmmToAsm/LA64/Ppr.hs
• compiler/GHC/CmmToAsm/PPC/Ppr.hs
• compiler/GHC/CmmToAsm/Ppr.hs
• compiler/GHC/CmmToAsm/X86/CodeGen.hs
• compiler/GHC/CmmToAsm/X86/Instr.hs
• compiler/GHC/CmmToAsm/X86/Ppr.hs
• compiler/GHC/CmmToLlvm/CodeGen.hs
• compiler/GHC/CmmToLlvm/Data.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Class.hs
• compiler/GHC/Core/Coercion.hs
• compiler/GHC/Core/Coercion.hs-boot
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/ConLike.hs
• compiler/GHC/Core/DataCon.hs
• compiler/GHC/Core/DataCon.hs-boot
• compiler/GHC/Core/FVs.hs
• compiler/GHC/Core/FamInstEnv.hs
• compiler/GHC/Core/LateCC/OverloadedCalls.hs
• compiler/GHC/Core/Lint.hs
• compiler/GHC/Core/Make.hs
• compiler/GHC/Core/Map/Expr.hs
• compiler/GHC/Core/Opt/Arity.hs
• compiler/GHC/Core/Opt/CprAnal.hs
• compiler/GHC/Core/Opt/DmdAnal.hs
• compiler/GHC/Core/Opt/Monad.hs
• compiler/GHC/Core/Opt/OccurAnal.hs
• compiler/GHC/Core/Opt/Pipeline.hs
• compiler/GHC/Core/Opt/Pipeline/Types.hs
• compiler/GHC/Core/Opt/SetLevels.hs
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• compiler/GHC/Core/Opt/WorkWrap.hs
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• compiler/GHC/Core/TyCo/Tidy.hs
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• compiler/GHC/Core/Unify.hs
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• compiler/GHC/CoreToIface.hs
• compiler/GHC/CoreToStg.hs
• + compiler/GHC/CoreToStg/AddImplicitBinds.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/IOEnv.hs
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• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/Core/Lint.hs
• compiler/GHC/Driver/Config/Core/Opt/Simplify.hs
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• + compiler/GHC/Driver/Session/Inspect.hs
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• compiler/GHC/Parser/Header.hs
• compiler/GHC/Parser/PostProcess.hs
• compiler/GHC/Parser/PostProcess/Haddock.hs
• compiler/GHC/Plugins.hs
• compiler/GHC/Rename/HsType.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Splice.hs
• compiler/GHC/Runtime/Debugger/Breakpoints.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Interpreter/Types.hs
• compiler/GHC/Stg/BcPrep.hs
• compiler/GHC/Stg/FVs.hs
• compiler/GHC/Stg/Lint.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm.hs
• compiler/GHC/StgToCmm/InfoTableProv.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToJS/Prim.hs
• compiler/GHC/StgToJS/StaticPtr.hs
• compiler/GHC/SysTools/Process.hs
• compiler/GHC/SysTools/Tasks.hs
• compiler/GHC/Tc/Deriv.hs
• compiler/GHC/Tc/Deriv/Generics.hs
• compiler/GHC/Tc/Deriv/Infer.hs
• compiler/GHC/Tc/Deriv/Utils.hs
• compiler/GHC/Tc/Errors.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Bind.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Expr.hs
• compiler/GHC/Tc/Gen/Expr.hs-boot
• compiler/GHC/Tc/Gen/Head.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Match.hs
• compiler/GHC/Tc/Gen/Pat.hs
• compiler/GHC/Tc/Gen/Sig.hs
• compiler/GHC/Tc/Gen/Splice.hs
• compiler/GHC/Tc/Gen/Splice.hs-boot
• compiler/GHC/Tc/Instance/Class.hs
• compiler/GHC/Tc/Instance/Family.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Solver.hs
• compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Dict.hs
• compiler/GHC/Tc/Solver/Equality.hs
• compiler/GHC/Tc/Solver/InertSet.hs
• compiler/GHC/Tc/Solver/Monad.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/Solver/Solve.hs
• + compiler/GHC/Tc/Solver/Solve.hs-boot
• compiler/GHC/Tc/Solver/Types.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/Constraint.hs
• − compiler/GHC/Tc/Types/EvTerm.hs
• compiler/GHC/Tc/Types/Evidence.hs
• compiler/GHC/Tc/Types/Origin.hs
• compiler/GHC/Tc/Types/TH.hs
• compiler/GHC/Tc/Utils/Concrete.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Basic.hs
• − compiler/GHC/Types/Breakpoint.hs
• compiler/GHC/Types/Demand.hs
• compiler/GHC/Types/Error.hs
• compiler/GHC/Types/Error/Codes.hs
• compiler/GHC/Types/Id.hs
• compiler/GHC/Types/Id/Make.hs
• compiler/GHC/Types/Name/Cache.hs
• compiler/GHC/Types/Name/Reader.hs
• compiler/GHC/Types/RepType.hs
• compiler/GHC/Types/SptEntry.hs
• compiler/GHC/Types/Tickish.hs
• compiler/GHC/Types/TyThing.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Types/Var.hs-boot
• compiler/GHC/Unit/Env.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Finder/Types.hs
• compiler/GHC/Unit/Module/Deps.hs
• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/ModGuts.hs
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/Error.hs
• compiler/GHC/Utils/Logger.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• compiler/Setup.hs
• compiler/ghc.cabal.in
• configure.ac
• distrib/configure.ac.in
• docs/users_guide/9.14.1-notes.rst → docs/users_guide/9.16.1-notes.rst
• docs/users_guide/conf.py
• docs/users_guide/debug-info.rst
• + docs/users_guide/diagnostics-as-json-schema-1_2.json
• docs/users_guide/eventlog-formats.rst
• docs/users_guide/expected-undocumented-flags.txt
• docs/users_guide/exts/doandifthenelse.rst
• docs/users_guide/exts/ffi.rst
• docs/users_guide/exts/gadt_syntax.rst
• docs/users_guide/exts/linear_types.rst
• + docs/users_guide/exts/relaxed_poly_rec.rst
• docs/users_guide/exts/required_type_arguments.rst
• docs/users_guide/exts/strict.rst
• docs/users_guide/exts/types.rst
• docs/users_guide/flags.py
• docs/users_guide/ghci.rst
• docs/users_guide/profiling.rst
• docs/users_guide/release-notes.rst
• docs/users_guide/runtime_control.rst
• docs/users_guide/separate_compilation.rst
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• docs/users_guide/using-warnings.rst
• docs/users_guide/using.rst
• docs/users_guide/win32-dlls.rst
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Exception.hs
• ghc/GHCi/UI/Monad.hs
• ghc/GHCi/UI/Print.hs
• ghc/ghc-bin.cabal.in
• hadrian/bootstrap/generate_bootstrap_plans
• hadrian/bootstrap/hadrian-bootstrap-gen.cabal
• hadrian/bootstrap/plan-9_10_1.json
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• hadrian/bootstrap/plan-bootstrap-9_8_1.json → hadrian/bootstrap/plan-bootstrap-9_12_2.json
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• hadrian/bootstrap/src/Main.hs
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• hadrian/hadrian.cabal
• hadrian/src/Builder.hs
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• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/ToolArgs.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/RunTest.hs
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• libraries/base/src/Data/List/NonEmpty.hs
• libraries/base/src/GHC/Exts.hs
• libraries/base/src/GHC/Generics.hs
• − libraries/base/src/GHC/IOPort.hs
• libraries/base/src/GHC/Stack/CloneStack.hs
• libraries/base/src/GHC/Weak/Finalize.hs
• libraries/base/src/System/Console/GetOpt.hs
• libraries/binary
• libraries/deepseq
• libraries/directory
• libraries/exceptions
• libraries/filepath
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• libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
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• + testsuite/tests/simd/should_run/floatx4_shuffle_baseline.hs
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• testsuite/tests/simplCore/should_compile/DataToTagFamilyScrut.stderr
• testsuite/tests/simplCore/should_compile/OpaqueNoCastWW.stderr
• testsuite/tests/simplCore/should_compile/T15056.stderr
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• + testsuite/tests/simplCore/should_compile/T26115.hs
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• testsuite/tests/simplCore/should_compile/T7360.stderr
• testsuite/tests/simplCore/should_compile/all.T
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• + testsuite/tests/simplCore/should_run/T26323.stdout
• testsuite/tests/simplCore/should_run/all.T
• testsuite/tests/simplStg/should_compile/T15226b.stderr
• + testsuite/tests/splice-imports/DodgyLevelExport.hs
• + testsuite/tests/splice-imports/DodgyLevelExport.stderr
• + testsuite/tests/splice-imports/DodgyLevelExportA.hs
• + testsuite/tests/splice-imports/LevelImportExports.hs
• + testsuite/tests/splice-imports/LevelImportExports.stdout
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• testsuite/tests/splice-imports/Makefile
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• + testsuite/tests/splice-imports/ModuleExportA.hs
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• testsuite/tests/splice-imports/SI29.stderr
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• + testsuite/tests/splice-imports/T26090A.hs
• testsuite/tests/splice-imports/all.T
• testsuite/tests/tcplugins/CtIdPlugin.hs
• + testsuite/tests/th/GadtConSigs_th_dump1.hs
• + testsuite/tests/th/GadtConSigs_th_dump1.stderr
• + testsuite/tests/th/GadtConSigs_th_pprint1.hs
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• testsuite/tests/th/Makefile
• testsuite/tests/th/T10267.stderr
• testsuite/tests/th/T11452.stderr
• testsuite/tests/th/T14627.stderr
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• testsuite/tests/th/T16180.hs
• testsuite/tests/th/T20868.stdout
• testsuite/tests/th/T7276.stderr
• + testsuite/tests/th/TH_Depends_Dir.hs
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• + testsuite/tests/th/TH_Depends_Dir_External.hs
• testsuite/tests/th/TH_NestedSplicesFail3.stderr
• testsuite/tests/th/TH_NestedSplicesFail4.stderr
• testsuite/tests/th/all.T
• testsuite/tests/type-data/should_run/T22332a.stderr
• testsuite/tests/typecheck/should_compile/Makefile
• testsuite/tests/typecheck/should_compile/T12427a.stderr
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• testsuite/tests/typecheck/should_compile/T23171.hs
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• testsuite/tests/typecheck/should_compile/T9497a.stderr
• testsuite/tests/typecheck/should_compile/TcSpecPragmas.stderr
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• testsuite/tests/typecheck/should_compile/all.T
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• testsuite/tests/typecheck/should_compile/subsumption_sort_hole_fits.stderr
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• testsuite/tests/typecheck/should_fail/TyAppPat_TooMany.stderr
• testsuite/tests/typecheck/should_fail/UnliftedNewtypesFamilyKindFail2.stderr
• testsuite/tests/typecheck/should_fail/all.T
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• testsuite/tests/typecheck/should_run/T9497c-run.stderr
• testsuite/tests/unboxedsums/unpack_sums_7.stdout
• testsuite/tests/unsatisfiable/T23816.stderr
• testsuite/tests/unsatisfiable/UnsatDefer.stderr
• + testsuite/tests/vdq-rta/should_compile/T25127_data.hs
• + testsuite/tests/vdq-rta/should_compile/T25127_data_inst.hs
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• testsuite/tests/vdq-rta/should_compile/all.T
• testsuite/tests/vdq-rta/should_fail/T23738_fail_pun.stderr
• testsuite/tests/vdq-rta/should_fail/T23739_fail_case.hs
• testsuite/tests/vdq-rta/should_fail/T23739_fail_case.stderr
• testsuite/tests/vdq-rta/should_fail/T24159_type_syntax_th_fail.script
• + testsuite/tests/vdq-rta/should_fail/T25127_fail_arity.hs
• + testsuite/tests/vdq-rta/should_fail/T25127_fail_arity.stderr
• + testsuite/tests/vdq-rta/should_fail/T25127_fail_th_quote.hs
• + testsuite/tests/vdq-rta/should_fail/T25127_fail_th_quote.stderr
• testsuite/tests/vdq-rta/should_fail/all.T
• testsuite/tests/wasm/should_run/control-flow/LoadCmmGroup.hs
• testsuite/tests/wasm/should_run/control-flow/RunWasm.hs
• utils/check-exact/ExactPrint.hs
• utils/deriveConstants/Main.hs
• utils/genprimopcode/Lexer.x
• utils/genprimopcode/Main.hs
• utils/genprimopcode/Parser.y
• utils/genprimopcode/ParserM.hs
• utils/genprimopcode/Syntax.hs
• utils/ghc-toolchain/exe/Main.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Target.hs
• utils/ghc-toolchain/src/GHC/Toolchain/Tools/Link.hs
• utils/haddock/CHANGES.md
• utils/haddock/doc/cheatsheet/haddocks.md
• utils/haddock/doc/markup.rst
• utils/haddock/haddock-api/haddock-api.cabal
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
• utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
• utils/haddock/haddock-api/src/Haddock/Convert.hs
• utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
• utils/haddock/haddock-api/src/Haddock/Interface.hs
• utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/haddock-library/haddock-library.cabal
• utils/haddock/haddock-test/haddock-test.cabal
• utils/haddock/haddock-test/src/Test/Haddock/Config.hs
• utils/haddock/haddock.cabal
• utils/haddock/html-test/ref/Bug1004.html
• + utils/haddock/html-test/ref/Bug25739.html
• + utils/haddock/html-test/ref/RedactTypeSynonyms.html
• + utils/haddock/html-test/src/Bug25739.hs
• + utils/haddock/html-test/src/RedactTypeSynonyms.hs
• + utils/haddock/latex-test/ref/RedactTypeSynonyms/RedactTypeSynonyms.tex
• + utils/haddock/latex-test/src/RedactTypeSynonyms/RedactTypeSynonyms.hs
• utils/hsc2hs
• utils/jsffi/dyld.mjs

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