Zubin pushed to branch wip/strict-level at Glasgow Haskell Compiler / GHC

Commits:

• 3b78e139
  by John Ericson at 2025-03-03T15:27:39-05:00

  Remove most of `GHC.Internal.Pack`
  
  Since bd82ac9f4716e28b185758ae514691d5a50c003f when `GHC.Pack` was
  deleted, it is no longer used except for one function by the RTS.
  

• b4fe0850
  by Rodrigo Mesquita at 2025-03-03T15:28:16-05:00

  ghci: Don't set virtualCWD on every iteration
  
  The calls to withVirtualCWD were introduced to fix #2973, but this bug
  is no longer reproducible, even when `withVirtualCWD` is dropped.
  
  This cleanup was originally motivated by the performance of :steplocal,
  but the performance problem has now been fixed at its root in the next
  commit.
  
  Even then, `withVirtualCWD` seems to now be an unnecessary artifact, and
  removing it simplifies the interpreter with no apparent drawbacks (testsuite is
  also happy with this change)
  

• 73ba1e6e
  by Rodrigo Mesquita at 2025-03-03T15:28:16-05:00

  ghci debugger: improve break/resume control flow
  
  After interpreting bytecode (`evalStmt`), we may want to hand off
  control to "GHCi.UI" in order to display an interactive break prompt:
  
  1. When an /active/ breakpoint (one set with :break ...) is hit
  2. At any breakpoint, when using :step from a breakpoint
  3. At any breakpoint in the same function f, when :steplocal is called
    from a breakpoint in f
  4. At any breakpoint in the same module, when :stepmodule is used
  
  Whether to pass control to the UI is now fully determined by
  `handleRunStatus` which transforms an `EvalStatus_` into an
  `ExecResult`. When `ExecBreak` is returned from `handleRunStatus` to
  GHCi, it always means GHCi breaks.
  
  `handleRunStatus` determines whether to loop and resume evaluation right away, or
  when to return to GHCi (by returning `ExecBreak` or `ExecComplete`).
  - (1) is queried using the `BreakpointStatus` message (the
    `breakpointStatus` call)
  - (2,3,4) are determined by the predicate `breakHere step span`, which
    inspects the improved `SingleStep` type to determine whether we care
    about this breakpoint even if it is not active.
  
  This refactor solves two big performance problems with the previous control flow:
  - We no longer call `withArgs/withProgram` repeatedly in the
    break/resume loop, but rather just once "at the top".
  - We now avoid computing the expensive `bindLocalsAtBreakpoint` for
    breakpoints we'd never inspect.
  
  In the interpreter_steplocal test added, calling `:steplocal` after breaking on `main = fib 25`
  now takes 12 seconds rather than 49 seconds on my machine.
  
  ```
  interpreter_steplocal(ghci) ghc/alloc  6,124,821,176    540,181,392 -91.2% GOOD
  ```
  
  Fixes #25779
  
  -------------------------
  Metric Decrease:
      interpreter_steplocal
  -------------------------
  

• c78d8f55
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  rts: fix top handler closure type signatures
  
  This commit fixes the runIO/runNonIO closure type signatures in the
  RTS which should be extern StgClosure. This allows us to remove an
  unnecessary type cast in the C foreign desugaring logic, as well as
  unneeded complications of JSFFI desugaring logic that also needs to
  generate C stubs that may refer to those top handler closures.
  Otherwise, we'll have to take special care to avoid generating "extern
  StgClosure" declarations for them as we would for other closures, just
  to avoid conflicting type signature error at stub compile time.
  

• a204df3a
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  compiler: allow arbitrary label string for JSFFI exports
  
  This commit allows arbitrary label string to appear in a foreign
  export declaration, as long as the calling convention is javascript.
  Well, doesn't make sense to enforce it's a C function symbol for a
  JSFFI declaration anyway, and it gets in the way of implementing the
  "sync" flavour of exports.
  

• 03ebab52
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  compiler: wasm backend JSFFI sync exports
  
  This commit implements the synchronous flavour of the wasm backend
  JSFFI exports:
  
  - `foreign export javascript "foo sync"` exports a top-level Haskell
    binding as a synchronous JS function
  - `foreign import javascript "wrapper sync"` dynamically exports a
    Haskell function closure as a synchronous JS function
  - `foreign import javascript unsafe` is now re-entrant by lowering to
    a safe ccall
  - Also fix the issue that JSFFI dynamic exports didn't really work in
    TH & ghci (#25473)
  

• b6ae908b
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  testsuite: test wasm backend JSFFI sync exports
  
  This commit repurposes some existing JSFFI test cases to make them
  cover JSFFI sync exports as well.
  

• edae2874
  by Cheng Shao at 2025-03-03T20:54:41+00:00

  docs: document wasm backend JSFFI sync exports
  
  This commit updates wasm backend documentation to reflect the new
  JSFFI sync exports feature.
  

• 9b54eecb
  by Cheng Shao at 2025-03-03T20:56:21+00:00

  wasm: add error message to WouldBlockException
  
  This commit attaches an error message to WouldBlockException, for now
  the error message consists of the JS async import code snippet that
  thunk is trying to block for. This is useful for debugging synchronous
  callbacks that accidentally call an async JS function.
  

• c331eebf
  by Cheng Shao at 2025-03-04T09:11:45-05:00

  compiler: avoid overwriting existing writers in putWithTables
  
  This patch makes `putWithTables` avoid overwriting all existing
  UserData writers in the handle. This is crucial for GHC API users that
  use putWithUserData/getWithUserData for serialization logic that
  involve Names.
  

• e9b7802b
  by Matthew Pickering at 2025-03-04T09:12:21-05:00

  ghci: Serialise mi_top_env
  
  When loading core from interface files (or from a bytecode object in
  future) it's important to store what the top-level context of a module
  is.
  Otherwise, when you load the module into GHCi from the interface files,
  only exported identifiers from the top-level module are in scope on the
  repl.
  
  See the added test which demonstrates what this enables.
  
  The context at the GHCi prompt is everything that's in-scope in the
  TopEnvIface module. Since TopEnvIface imports identifier "a", we can
  evaluate "a" in the repl.
  
  In addition to all this, we can use this information in order to
  implement reifyModule in a more principled manner.
  
  This becomes even more important when you're debugging and what to set
  break-points on functions which are not imported.
  

• 73e02068
  by Matthew Pickering at 2025-03-04T09:12:21-05:00

  Implement reifyModule in terms of mi_top_env
  
  mi_top_env provides precisely the information that reifyModule needs,
  the user written imports.
  
  This is important as it unblocks !9604 and #22188
  
  Fixes #8489
  

• 0a99825d
  by Ben Gamari at 2025-03-04T09:12:57-05:00

  hadrian: Refactor handling of test suite environment
  
  Previously we would set the environment variables used to run the
  testsuite driver using `setEnv` to set them in the Hadrian process.
  While looking into failures of a fix to #25752 I noticed this and took
  the opportunity to refactor.
  

• 7ca72844
  by Alan Zimmerman at 2025-03-04T09:13:34-05:00

  [EPA] Sync with the ghc-exactprint repo
  
  This brings it into line with the changes in
  https://hackage.haskell.org/package/ghc-exactprint-1.12.0.0
  
  But also keeps the latest changes from master.
  

• 8f6cc90c
  by Matthew Pickering at 2025-03-05T04:48:02-05:00

  perf: Speed up the bytecode assembler
  
  This commit contains a number of optimisations to the bytecode
  assembler. In programs which generate a large amount of bytecode, the
  assembler is called a lot of times on many instructions.
  
  1. Specialise the assembleI function for the two intepreters to avoid
  having to materialise the intermediate free-monad like structure.
  2. Directly compute the UArray and SmallArray needed rather than going
     via the intermediate SizedSeq
  3. Use optimised monads
  4. Define unrolled "any" and "mapM6" functions which can be inlined
     and avoid calling recursive functions.
  
  The resulting generated code is much more direct.
  
  Before:
  
  ./ByteCodeAsm /home/matt/ghc-profiling-light/_build/stage1/lib/ +RTS  -s
    48,923,125,664 bytes allocated in the heap
       678,221,152 bytes copied during GC
           395,648 bytes maximum residency (2 sample(s))
            50,040 bytes maximum slop
                 6 MiB total memory in use (0 MiB lost due to fragmentation)
  
                                       Tot time (elapsed)  Avg pause  Max pause
    Gen  0     11731 colls,     0 par    0.419s   0.425s     0.0000s    0.0004s
    Gen  1         2 colls,     0 par    0.001s   0.001s     0.0007s    0.0012s
  
    INIT    time    0.000s  (  0.000s elapsed)
    MUT     time    6.466s  (  6.484s elapsed)
    GC      time    0.421s  (  0.426s elapsed)
    EXIT    time    0.000s  (  0.000s elapsed)
    Total   time    6.887s  (  6.910s elapsed)
  
  After:
  
     1,518,321,200 bytes allocated in the heap
         4,299,552 bytes copied during GC
           322,288 bytes maximum residency (2 sample(s))
            50,280 bytes maximum slop
                 6 MiB total memory in use (0 MiB lost due to fragmentation)
  
                                       Tot time (elapsed)  Avg pause  Max pause
    Gen  0       369 colls,     0 par    0.003s   0.003s     0.0000s    0.0002s
    Gen  1         2 colls,     0 par    0.001s   0.001s     0.0007s    0.0012s
  
    INIT    time    0.001s  (  0.001s elapsed)
    MUT     time    0.465s  (  0.466s elapsed)
    GC      time    0.004s  (  0.004s elapsed)
    EXIT    time    0.000s  (  0.000s elapsed)
    Total   time    0.470s  (  0.471s elapsed)
  

• f2d43e11
  by Teo Camarasu at 2025-03-05T04:48:40-05:00

  ghc-boot-th: expose all TH packages from proper GHC.Boot.* modules
  
  Previously we defined some modules here in the GHC.Internal namespace.
  Others were merely re-exposed from GHC.Internal.
  
  Re-exposed modules weren't handled correctly by Haddock, so the
  Haddocks for the `template-haskell` library couldn't see them.
  This change also makes the home package of these modules a bit clearer.
  
  Work towards #25705
  

• 91ef82df
  by Teo Camarasu at 2025-03-05T04:48:40-05:00

  ghc-boot-th: fix synopsis formatting
  
  `@...@` syntax doesn't seem to work in synposes and is just kept by
  Haddock verbatim.
  

• eb9fe1ec
  by Brandon Chinn at 2025-03-05T04:49:17-05:00

  Collapse string gaps as \& (#25784)
  
  In 9.10, "\65\ \0" would result in "A0", but in 9.12, it results in
  "\650", due to the string refactoring I did in !13128. Previously, we
  were resolving escape codes and collapsing string gaps as we come across
  them, but after the refactor, string processing is broken out into
  phases, which is both more readable and useful for multiline strings.
  

• 8037f487
  by Cheng Shao at 2025-03-05T04:49:54-05:00

  ghc-experimental: make JSVal abstract in GHC.Wasm.Prim
  
  This commit makes JSVal an abstract type in the export list of
  GHC.Wasm.Prim. JSVal's internal representation is supposed to be a non
  user facing implementation detail subject to change at any time. We
  should only expose things that are newtypes of JSVal, not JSVal
  itself.
  

• 4f342431
  by Cheng Shao at 2025-03-05T04:49:54-05:00

  wasm: make JSVal internal Weak# point to lifted JSVal
  
  JSVal has an internal Weak# with the unlifted JSVal# object as key to
  arrange its builtin finalization logic. The Weak# used to designate
  Unit_closure as a dummy value; now this commit designates the lifted
  JSVal closure as the Weak# value. This allows the implementation of
  mkWeakJSVal which can be used to observe the liveliness of a JSVal and
  attach a user-specified finalizer.
  

• 55af20e6
  by Cheng Shao at 2025-03-05T04:49:54-05:00

  ghc-experimental: add mkWeakJSVal
  
  This commit adds a mkWeakJSVal function that can be used to set up a
  Weak pointer with a JSVal key to observe the key's lifetime and
  optionally attach a finalizer.
  

• 8273d7d1
  by Matthew Pickering at 2025-03-05T04:50:30-05:00

  simplifier: Zap Id unfoldings before constructing InScopeSet in simpleOptExpr
  
  Care must be taken to remove unfoldings from `Var`s collected by exprFreeVars
  before using them to construct an in-scope set hence `zapIdUnfolding` in `init_subst`.
  Consider calling `simpleOptExpr` on an expression like
  
  ```
   case x of (a,b) -> (x,a)
  ```
  
  * One of those two occurrences of x has an unfolding (the one in (x,a), with
  unfolding x = (a,b)) and the other does not. (Inside a case GHC adds
  unfolding-info to the scrutinee's Id.)
  * But exprFreeVars just builds a set, so it's a bit random which occurrence is collected.
  * Then simpleOptExpr replaces each occurrence of x with the one in the in-scope set.
  * Bad bad bad: then the x in  case x of ... may be replaced with a version that has an unfolding.
  
  Fixes #25790
  

• 07fe6d1d
  by Rodrigo Mesquita at 2025-03-05T04:51:07-05:00

  docs: Fix ghci :doc documentation
  
  Fixes #25799
  

• a510b861
  by Matthew Pickering at 2025-03-06T11:43:23+00:00

  Add flag to control whether self-recompilation information is written to interface
  
  This patch adds the flag -fwrite-if-self-recomp which controls whether
  interface files contain the information necessary to answer the
  question:
  
    Do I need to recompile myself or is this current interface file
    suitable?
  
  Why? Most packages are only built once either by a distribution or cabal
  and then placed into an immutable store, after which we will never ask
  this question. Therefore we can derive two benefits from omitting this
  information.
  
  * Primary motivation: It vastly reduces the surface area for creating
    non-deterministic interface files. See issue #10424 which motivated a
    proper fix to that issue. Distributions have long contained versions
    of GHC which just have broken self-recompilation checking (in order to
    get deterministic interface files).
  
  * Secondary motivation: This reduces the size of interface files
    slightly.. the `mi_usages` field can be quite big but probably this
    isn't such a great benefit.
  
  * Third motivation: Conceptually clarity about which parts of an
    interface file are used in order to **communicate** with subsequent
    packages about the **interface** for a module. And which parts are
    used to self-communicate during recompilation checking.
  
  The main tracking issue is #22188 but fixes issues such as #10424 in a
  proper way.
  

• 5b05c27b
  by Matthew Pickering at 2025-03-06T11:43:23+00:00

  Disable self recomp in release flavour
  
  The interface files that we distribute should not contain any
  information which is used by the recompilation checking logic since
  source file will never be compiled again.
  
  I am not 100% sure this won't cause unexpected issues, there many be
  downstream consumers which are incorrectly using the information from
  interfaces, but this commit can be reverted if we detect issues.
  

• 1d4c9824
  by Matthew Craven at 2025-03-06T18:11:59-05:00

  Cmm: Add surface syntax for Word/Float bitcast ops
  

• 25c4a2a2
  by Matthew Craven at 2025-03-06T18:11:59-05:00

  Cmm: Add constant-folding for Word->Float bitcasts
  

• 30bdea67
  by Matthew Craven at 2025-03-06T18:11:59-05:00

  Add tests for #25771
  

• 44bf5fa1
  by Matthew Pickering at 2025-03-07T13:48:18+00:00

  iface: Store flags in interface files
  
  When reporting the reason why a module is recompiled (using
  `-dump-hi-diffs`), it is much more informative to inform the user about
  which flag exactly has changed, rather than just an opaque reference to
  a hash.
  
  Now, when the user enables `-fwrite-if-self-recomp-flags`
  there is a difference the precise part of the flags is
  reported:
  
  ```
  codegen flags changed:
  before: [Opt_NoTypeableBinds, Opt_OmitYields]
  after: [Opt_NoTypeableBinds, Opt_OmitYields, Opt_DictsStrict]
  ```
  
  Fixes #25571
  

• 324222bd
  by Oleg Grenrus at 2025-03-08T08:50:18-05:00

  Run fix-whitespace on compiler/
  
  https://hackage.haskell.org/package/fix-whitespace
  
  IMO this should be included into lint suite
  

• 1e53277a
  by sheaf at 2025-03-08T16:32:25-05:00

  Allow defaulting of representational equalities
  
  This commit generalises the defaulting of equality constraints that
  was introduced in 663daf8d (with follow-up in 6863503c) to allow
  the defaulting of *representational* equality constraints.
  
  Now we default a representational equality
  
    ty1 ~R# ty2
  
  by unifying ty1 ~# ty2.
  
  This allows the following defaulting to take place:
  
    - Coercible alpha[tau] Int ==> alpha := Int
    - Coercible (IO beta[tau]) (IO Char) ==> beta := Char
  
  See Note [Defaulting representational equalities] in GHC.Tc.Solver.Default
  for more details.
  
  Fixes #21003
  

• d6c40afc
  by Andreas Klebinger at 2025-03-08T16:33:02-05:00

  Revert "Use `Infinite` in unique generation, and clean up some other partial uni patterns as well."
  
  This reverts commit 643dd3d86968c527ba07ece9cc337728dbdfe2a0.
  
  As described in #25817 this commit introduced a subtle bug in AArch64
  code generation. So for the time being I will simply revert it
  wholesale.
  

• 68310e11
  by Andreas Klebinger at 2025-03-08T16:33:39-05:00

  Properly describe acceptance window for stat tests.
  
  The relative metric is already in %, so no need to multiply by 100.
  

• cca68421
  by Cheng Shao at 2025-03-08T22:04:42-05:00

  wasm: do not use wasm type reflection in dyld
  
  The wasm dynamic linker used to depend on v8's experimental wasm type
  reflection support to generate stub functions when treating GOT.func
  items that aren't exported by any loaded library yet. However, as we
  work towards wasm ghci browser mode (#25399), we need to ensure the
  wasm dyld logic is portable across browsers. So this commit removes
  the usage of wasm type reflection in wasm dyld, and it shall only be
  added many months later when this feature is widely available in
  browsers.
  

• 75fcc5c9
  by Cheng Shao at 2025-03-08T22:05:19-05:00

  wasm: don't create a wasm global for dyld poison
  
  There's a much more efficient way to convert an unsigned i32 to a
  signed one. Thanks, o3-mini-high.
  

• fd40eaa1
  by Cheng Shao at 2025-03-08T22:05:19-05:00

  wasm: revamp JSFFI internal implementation and documentation
  
  This patch revamps the wasm backend's JSFFI internal implementation
  and documentation:
  
  - `JSValManager` logic to allocate a key is simplified to simple
    bumping. According to experiments with all major browsers, the
    internal `Map` would overflow the heap much earlier before we really
    exhaust the 32-bit key space, so there's no point in the extra
    complexity.
  - `freeJSVal` is now idempotent and safe to call more than once. This
    is achieved by attaching the `StablePtr#` to the `JSVal#` closure
    and nullifying it when calling `freeJSVal`, so the same stable
    pointer cannot be double freed.
  - `mkWeakJSVal` no longer exposes the internal `Weak#` pointer and
    always creates a new `Weak#` on the fly. Otherwise by finalizing
    that `Weak#`, user could accidentally drop the `JSVal`, but
    `mkWeakJSVal` is only supposed to create a `Weak` that observes the
    `JSVal`'s liveliness without actually interfering it.
  - `PromisePendingException` is no longer exported since it's never
    meant to be caught by user code; it's a severe bug if it's actually
    raised at runtime.
  - Everything exported by user-facing `GHC.Wasm.Prim` now has proper
    haddock documentation.
  - Note [JSVal representation for wasm] has been updated to reflect the
    new JSVal# memory layout.
  

• cbae3708
  by Ben Gamari at 2025-03-11T06:09:58-04:00

  users guide: Fix typo

• 1951eb7a
  by Ben Gamari at 2025-03-11T06:10:35-04:00

  testsuite: Don't count fragile passes as failures in JUnit output
  
  As noted in #25806, the testsuite driver's JUnit output
  previously considered passes of fragile tests to be failures. Fix this.
  
  Closes #25806.

• 589f40b9
  by Matthew Pickering at 2025-03-11T06:11:11-04:00

  Use panic rather than error in expectJust
  
  Otherwise, we would not get a callstack printed out when the exception
  occurs.
  
  Fixes #25829
  

• d450e88e
  by sheaf at 2025-03-11T06:42:59-04:00

  Solve Wanted quantified constraints from Givens
  
  This commit ensures we directly solve Wanted quantified constraints from
  matching inert Given quantified constraints,instead of going through the
  trouble of emitting an implication constraint and processing that.
  
  This is not just an optimisation; it makes our lives easier when
  generating RULEs for specialisation.
  See Note [Solving Wanted QCs from Given QCs] for details
  
  Fixes #25758
  

• 48daaf53
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  testsuite: Add testcase for #25577
  

• d2ffb0ce
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  testsuite/ghc-api: Eliminate Makefile usage from various GHC API tests
  
  These tests can be expressed perfectly well using the testsuite driver
  itself.
  

• 2275b642
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  rts/linker/MachO: Assert that GOT relocations have GOT entries
  
  In #25577 we found that some GOT relocation types were not being given
  relocation entries. Add assertions to catch this sort of failure in the
  future.
  

• 8c96bcb4
  by Ben Gamari at 2025-03-11T06:42:59-04:00

  rts/linker/MachO: Account for internal GOT references in GOT construction
  
  Previously we failed to give GOT slots to symbols which were referred to
  by GOT relocations in the same module. This lead to #25577.
  
  Fix this by explicitly traversing relocation lists and maintaining a
  `needs_got` flag for each symbol.
  
  Fixes #25577.
  

• 7b84c588
  by Vladislav Zavialov at 2025-03-11T06:43:02-04:00

  One list in ConPat (part of #25127)
  
  This patch changes PrefixCon to use one list instead of two:
  
  	-data HsConDetails tyarg arg rec
  	-  = PrefixCon [tyarg] [arg]
  	+data HsConDetails arg rec
  	+  = PrefixCon [arg]
  	   | RecCon    rec
  	   | InfixCon  arg arg
  
  The [tyarg] list is now gone. To understand the effect of this change,
  recall that there are three instantiations of HsConDetails:
  
  1. type HsConPatDetails p =
        HsConDetails (HsConPatTyArg (NoGhcTc p))  -- tyarg
                     (LPat p)                     -- arg
                     (HsRecFields p (LPat p))     -- rec
  
  2. type HsConDeclH98Details pass =
        HsConDetails Void                              -- tyarg
                     (HsScaled pass (LBangType pass))  -- arg
                     (XRec pass [LConDeclField pass])  -- rec
  
  3. type HsPatSynDetails pass =
        HsConDetails Void                     -- tyarg
                     (LIdP pass)              -- arg
                     [RecordPatSynField pass] -- rec
  
  In cases (2) and (3), tyarg was instantiated to Void, so the [tyarg]
  list was always empty. Its removal is basically a no-op.
  
  The interesting case is (1), which is used in ConPat to represent
  pattern matching of the form (MkE @tp1 @tp2 p1 p2).
  With this patch, its representation is changed as follows:
  
    ConPat "MkE" [tp1, tp2] [p1, p2]               -- old
    ConPat "MkE" [InvisP tp1, InvisP tp2, p1, p2]  -- new
  
  The new mixed-list representation is consintent with lambdas, where
  InvisP is already used to deal with \ @tp1 @tp2 p1 p2 -> body.
  
  The immediate effect of the new representation is an improvement to
  error messages. Consider the pattern (Con x @t y). Previously it
  resulted in a parse error because @t could not occur after x. Now it is
  reported as [GHC-14964]. Test case: TyAppPat_MisplacedApplication.
  
  In the long term, this is intended as preparation for #18389 and #25127,
  which would make (Con x @t y) potentially valid, e.g. if its type is
    Con :: forall a -> forall b. (a, b) -> T
  
  The TH AST is left unchanged for the moment to avoid breakage.
  

• cce869ea
  by Vladislav Zavialov at 2025-03-11T06:43:02-04:00

  Error message with EmptyCase and RequiredTypeArguments (#25004)
  
  Fix a panic triggered by a combination of \case{} and forall t ->
  
    ghci> let f :: forall (xs :: Type) -> (); f = \case {}
    panic! (the 'impossible' happened)
      GHC version 9.10.1:
            Util: only
  
  The new error message looks like this:
  
    ghci> let f :: forall (xs :: Type) -> (); f = \case {}
    <interactive>:5:41: error: [GHC-48010]
        • Empty list of alternatives in \case expression
          checked against a forall-type: forall xs -> ...
  
  This is achieved as follows:
  
  * A new data type, BadEmptyCaseReason, is now used to describe
    why an empty case has been rejected. Used in TcRnEmptyCase.
  
  * HsMatchContextRn is passed to tcMatches, so that the type checker
    can attach the syntactic context to the error message.
  
  * tcMatches now rejects type arguments if the list of alternatives is
    empty. This is what fixes the bug.
  

• 37d8b50b
  by sheaf at 2025-03-11T06:43:06-04:00

  user's guide: consolidate defaulting documentation
  
  This commit adds a new section on defaulting, which consolidates various
  parts of documentation surrounding defaulting into one central place.
  
  It explains type class defaulting in detail, extensions to it with
  OverloadedStrings, NamedDefaults and ExtendedDefaultRules, as well
  as other defaulting mechanisms (e.g. kind-based defaulting such as
  RuntimeRep defaulting, and defaulting of equalities).
  

• 0c9fd8d4
  by sheaf at 2025-03-11T06:43:06-04:00

  user's guide: flesh out XOverloadedStrings docs
  
  This commit extends the documentation of the OverloadedStrings extension
  with some usage information, in particular suggestions to:
  
    - use default declarations, such as `default (Text)` or
      `default IsString(Text)` (with the NamedDefaults extension),
  
    - enable the ExtendedDefaultRules extension to relax the requirement
      that a defaultable type variable must only appear in unary standard
      classes
  
  Fixes #23388
  

• 2df171d4
  by sheaf at 2025-03-11T06:43:06-04:00

  user's guide: NamedDefaults vs ExtendedDefaultRules
  
  This commit clarifies the defaulting rules with NamedDefaults,
  in particular in situations where a type variable appears in other
  constraints than standard/unary constraints.
  

• 77df05d0
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Take into account all flags when computing iface_hash
  
  The "interface hash" should contain a hash of everything in the
  interface file. We are not doing that yet but at least a start is to
  include a hash of everything in `mi_self_recomp`, rather than just
  `mi_src_hash` and `mi_usages`.
  
  In particular, this fixes #25837, a bug where we should recompile a
  `dyn_hi` file but fail to do so.
  

• 48b8f110
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Pass -fPIC to dynamicToo001 test to avoid platform dependence issues
  
  On darwin platforms, `-fPIC` is always enabled but on linux it is only
  enabled in the dynamic flavour. This can cause a difference in
  interface files (see #25836).
  
  The purpose of this test isn't to test module A recompilation, so we
  avoid this platform dependency by always passing `-fPIC`.
  

• 03c72f01
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Remove mi_used_th field from interface files
  
  In the distant past, recompilation checking was disabled for interfaces which used
  TemplateHaskell, but for several years now recompilation checking has
  been more fine-grained. This has rendered this field unused and
  lingering in an interface file.
  

• 6bb0e261
  by Matthew Pickering at 2025-03-11T06:43:07-04:00

  Remove mi_hpc field from interface files
  
  The `mi_hpc` field is not used for anything as far as I can discern so
  there is no reason to record in the private interface of a module that
  there are modules in the transitive closure which use `hpc`.
  
  You can freely mix modules which use `-fhpc` and ones which don't.
  
  Whether to recompile a module due to `-fhpc` being passed to the module
  itself is determined in `fingerprintDynFlags`.
  

• b6d5b091
  by Simon Peyton Jones at 2025-03-11T22:39:23-04:00

  We can't UNPACK multi-constructor GADTs
  
  This MR fixes #25672
  
  See Note [Unpacking GADTs and existentials] in GHC.Types.Id.Make
  

• 8eae151d
  by Teo Camarasu at 2025-03-11T22:40:00-04:00

  template-haskell: Add explicit exports lists to all remaining modules
  

• db621b58
  by Teo Camarasu at 2025-03-11T22:40:00-04:00

  template-haskell: fix haddocks
  
  It seems that we need a direct dependency on ghc-internal, otherwise
  Haddock cannot find our haddocks
  
  The bug seems to be caused by Hadrian because if I rebuild with
  cabal-install (without this extra dependency) then I get accurate
  Haddocks.
  
  Resolves #25705
  

• 64ea68d9
  by Ben Gamari at 2025-03-12T07:11:51-04:00

  mk-ghcup-metadata: Clean up and add type annotations
  
  Getting this file right has historically been quite painful as it is a
  dynamically-typed script running only late in the release pipeline.
  

• b3f80b07
  by Ben Gamari at 2025-03-12T07:12:27-04:00

  rts: Drop imports of pthreads functions in cmm sources
  
  These are no longer used. I noticed these while looking for uses of
  __PIC__ in Cmm sources.
  

• 915a6781
  by Matthew Pickering at 2025-03-13T01:46:41-04:00

  interfaces: Ensure that forceModIface deeply forces a ModIface
  
  A ModIface is the result of compilation that we keep for a long time in
  memory. Therefore, it's very important to manage what we are going to
  retain and remove any external references to things which we might have
  captured compilation.
  
  If storing your ModIface in memory uses too much space, then store
  less things or make it use a more efficient representation.
  
  In the past there have been many space leak bugs by not sufficiently
  forcing a ModIface (#15111)
  
  This patch adds all the missing NFData instances for all the places I
  could find where we weren't deeply forcing the structure.
  

• 24d373a6
  by Matthew Craven at 2025-03-13T01:47:18-04:00

  Add interface-stability test for ghc-prim
  

• 0cb1db92
  by sheaf at 2025-03-14T13:11:44-04:00

  Don't report used duplicate record fields as unused
  
  This commit fixes the bug reported in #24035 in which the import of a
  duplicate record field could be erroneously reported as unused.
  
  The issue is that an import of the form "import M (fld)" can import
  several different 'Name's, and we should only report an error if ALL
  of those 'Name's are unused, not if ANY are.
  
  Note [Reporting unused imported duplicate record fields]
  in GHC.Rename.Names explains the solution to this problem.
  
  Fixes #24035
  

• f1830d74
  by Matthew Pickering at 2025-03-14T13:12:21-04:00

  binary: Directly copy ShortByteString to buffer rather than go via ByteString
  
  This avoids allocating an intermediate bytestring. I just noticed on a
  profile that `putFS` was allocating, and it seemed strange to me why
  since it should just copy the contents of the FastString into the
  already allocated buffer. It turned out we were going indirectly via a
  ByteString.
  
  Fixes #25861
  

• b15fca2b
  by Matthew Pickering at 2025-03-15T05:36:40-04:00

  iface: Store logical parts of ModIface together
  
  The ModIface structure is divided into several logical parts:
  
  1. mi_mod_info: Basic module metadata (name, version, etc.)
  
  2. mi_public: The public interface of the module (the ABI), which includes:
     - Exports, declarations, fixities, warnings, annotations
     - Class and type family instances
     - Rewrite rules and COMPLETE pragmas
     - Safe Haskell and package trust information
     - ABI hashes for recompilation checking
  
  4. mi_self_recomp: Information needed for self-recompilation checking
     (see Note [Self recompilation information in interface files])
  
  5. mi_simplified_core: Optional simplified Core for bytecode generation
     (only present when -fwrite-if-simplified-core is enabled)
  
  6. mi_docs: Optional documentation (only present when -haddock is enabled)
  
  7. mi_top_env: Information about the top-level environment of the original source
  
  8. mi_ext_fields: Additional fields for extensibility
  
  This structure helps organize the interface data according to its purpose and usage
  patterns. Different parts of the compiler use different fields. By separating them
  logically in the interface we can arrange to only deserialize the fields that are needed.
  
  This patch also enforces the invariant that the fields of ModIface are
  lazy. If you are keeping a ModIface on disk, then force it using
  `forceModIface`. Otherwise, when the `ModIface` is read from disk, only
  the parts which are needed from the interface will be deserialised.
  
  In a follow-up patch I will tackle follow-up issues:
  
  * Recompilation checking doesn't take into account exported named defaults (#25855)
  * Recompilation checking does not take into account COMPLETE pragmas (#25854)
  * mi_deps_ field in an interface is confused about whether the
    information is for self-recompilation checking or part of the ABI
    (#25844)
  
  Fixes #25845
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesDefsGhciWithCore
  -------------------------
  

• c758cb71
  by Ben Gamari at 2025-03-15T05:37:17-04:00

  configure: Fix incorrect SettingsLlvmAsFlags value
  
  Previously this was set to `LlvmAsCmd` rather than `LlvmAsFlags`,
  resulting in #25856.

• cfaaca14
  by sheaf at 2025-03-18T20:05:03-04:00

  Fix buglet in isEmptyWorkList
  
  There was a missing case in GHC.Tc.Solver.InertSet.isEmptyWorkList; it
  mistakenly ignored the 'wl_rw_eqs' field. This commit simply fixes that.
  No test case.
  

• 9f9fe0b3
  by sheaf at 2025-03-18T20:05:03-04:00

  Add mapMaybeTM method to TrieMap class
  
  This commit adds a new method to the TrieMap class, mapMaybeTM, and
  adds implementations to all the instances.
  
  mapMaybeTM is useful when filtering containers that contain other
  containers.
  

• 393531ff
  by Simon Peyton Jones at 2025-03-18T20:05:03-04:00

  Specialising expressions -- at last
  
  This MR addresses #24359, which implements the GHC proposal 493 on SPECIALISE pragmas.
  
  * The old code path (using SpecSig and SpecPrag) still exists.
  * The new code path (using SpecSigE and SpecPragE) runs alongside it.
  * All SPECIALISE pragmas are routed through the new code path, except
    if you give multiple type sigs, when the old code path is still used.
  * Main documentation: Note [Handling new-form SPECIALISE pragmas] in
    GHC.Tc.Gen.Sig`
  
  Thanks to @sheaf for helping with this MR.
  
  The Big Thing is to introduce
  
    {-# SPECIALISE forall x.  f @Int x True #-}
  
  where you can give type arguments and value argument to specialise; and
  you can quantify them with forall, just as in Rules.
  
  I thought it was going to be pretty simple, but it was a Long, Long Saga.
  
  Highlights
  
  * Overview Note [Handling new-form SPECIALISE pragmas] in GHC.Tc.Gen.Sig
    - New data constructor `SpecSigE` in data type `L.H.S.Binds.Sig`
    - New data construtor `SpecPragE` in data type `GHC.Hs.Binds.TcSpecPrag`
    - Renamer: uses `checkSpecESigShape` to decide which function to assocate the
               SPECIALISE pragma with
    - Some of the action is in `GHC.Tc.Gen.Sig.tcSpecPrag`
    - The rest is in `GHC.HsToCore.Binds.dsSpec`
  
  * We use a new TcS mode, TcSFullySolve, when simplifying the Wanteds
    that arise from the specialise expression. The mechanism is explained
    in Note [TcSFullySolve] in GHC.Tc.Solver.Monad. The reason why we need
    to do this is explained in Note [Fully solving constraints for specialisation]
    in GHC.Tc.Gen.Sig.
  
  * All of GHC.Tc.Gen.Rule is moved into GHC.Tc.Gen.Sig, because the code is
    very closely related.
  
  * The forall'd binders for SPECIALISE are the same as those for a RULE, so I
    refactored, introducing data type `L.H.S.Binds.RuleBndrs`, with functions
    to rename, zonk, typecheck it.  I refactored this data type a bit; nicer now.
  
  * On the LHS of RULES, or SPECIALISE, we want to disable the tricky mechanims
    described in Note [Desugaring non-canonical evidence] in GHC.HsToCore.Expr.
    Previously it wasn't fully disabled (just set to the empty set), and that
    didn't quite work in the new regime.
  
  * There are knock-on changes to Template Haskell.
  
  * For the LHS of a RULE and a SPECIALISE expression, I wanted to simplify
    it /without/ inlining the let-bindings for evidence variables.  I added
    a flag `so_inline` to the SimpleOpt optimiser to support this.  The
    entry point is `GHC.Core.SimpleOpt.simpleOptExprNoInline`
  
  * Since forever we have had a hack for type variables on the LHS of
    RULES. I took the opportunity to tidy this up.  The main action is
    in the zonker.  See GHC.Tc.Zonk.Type Note [Free tyvars on rule LHS],
    and especially data construtor `SkolemiseFlexi`
    in data type `GHC.Tc.Zonk.Env.ZonkFlexi`
  
  * Move `scopedSort` from GHC.Core.TyCo.FVs to GHC.Core.Predicate
    Reason: it now works for Ids as well, and I wanted to use isEvVar,
            which is defined in GHC.Core.Predicate
    Avoiding module loops meant that instead of exporting GHC.Core.TyCo.Tidy
    from GHC.Core.Type, modules now import the former directly.
  
    I also took the opportunity to remove unused exports
    from GHC.Core.Type.hs-boot
  
  * Flag stuff:
    - Add flag `-Wdeprecated-pragmas` and use it to control the warning when
      using old-style SPECIALISE pragmas with multiple type ascriptions,
  
    - Add flag `-Wuseless-specialisations` and use it to control the warning emitted
      when GHC determines that a SPECIALISE pragma would have no effect. Don't
      want if the SPECIALISE is SPECIALISE INLINE (#4444)
  
      In response to #25389, we continue to generate these seemingly code for these
      seemingly useless SPECIALISE pragmas
  
    - Adds deprecations to Template Haskell `pragSpecD` and `pracSpecInlD`,
  
  * Split up old-style SPECIALISE pragmas in GHC.Internal.Float,
    GHC.Internal.Numeric, GHC.Internal.Real
  
  * Remove useless SPECIALISE pragmas in Data.Array (updating the array submodule)
  
  Smaller things:
  
  - Update the Users Guide
  
  - Add mention of the changes to the 9.14 release notes as well as
    the Template Haskell changelog,
  

• 1884dd1a
  by Simon Peyton Jones at 2025-03-18T20:05:03-04:00

  Add -Wrule-lhs-equalities warning
  
  This commit adds a new warning, controlled by the warning flag,
  -Wrule-lhs-equalities, which is emitted when the LHS of a RULE gives
  rise to equality constraints that previous GHC versions would have
  quantified over.
  
  GHC instead discards such RULES, as GHC was never able to generate
  a rule template that would ever fire; it's better to be explicit about
  the fact that the RULE doesn't work.
  

• b00b3ef0
  by Ben Gamari at 2025-03-18T20:05:41-04:00

  compiler: Add export list to GHC.SysTools.Process
  
  This also revealed that `readProcessEnvWithExitCode` and its local
  helpers were dead code.
  

• 25850b22
  by ARATA Mizuki at 2025-03-18T20:06:25-04:00

  Fix code generation for SSE vector operations
  
  The new implementation generates correct code
  even if the registers overlap.
  
  Closes #25859
  

• e576468c
  by Andreas Klebinger at 2025-03-18T20:07:02-04:00

  Bump nofib submodule.
  
  Fixes #25867. (Ben-raytrace being broken by library changes)
  

• 443fc8b1
  by Sjoerd Visscher at 2025-03-19T12:01:04-04:00

  Multiplicity annotation on records
  
  Needing to store multiplicity annotations on records triggered a refactoring of AST of data declarations:
  
  Moved HsBangTy and HsRecTy from HsType to HsTypeGhcPsExt, the extension of HsType during parsing, since they are only needed during parsing.
  
  New HsConDeclField that stores all source data shared by all constructor declaration fields: unpackedness, strictness, multiplicity, documentation and the type of the field.
  
  Merged HsMultAnn and HsArrowOf, so all multiplicity annotations share the same data type.
  
  HsBang was no longer needed as a separate type, and was inlined into HsSrcBang.
  

• 313cf271
  by Ben Gamari at 2025-03-19T12:01:43-04:00

  gitlab-ci: Drop CentOS 7 binary distributions
  
  CentOS 7 is EoL and moreover we cannot even build images for it.
  
  See #25061.
  

• 5b94f99f
  by Ben Gamari at 2025-03-19T12:02:21-04:00

  rts: Ensure that WinIO flag is set when --io-manager=auto
  
  As noted in #25838, previously `selectIOManager` failed to set
  `rts_IOManagerIsWin32Native` in its `IO_MNGR_FLAG_AUTO`. This meant
  that the MIO path was taken when WinIO was supposedly selected,
  resulting in chaos.
  
  Fixes #25838.
  

• 1a3f1131
  by Peng Fan at 2025-03-19T12:03:10-04:00

  Pass the mcmodel=medium parameter to CC via GHC
  
  Ensure that GHC-driver builds default to mcmodel=medium, so that GHC
  passes this default parameter to CC without having to add it to the
  compiled project.
  
  Commit e70d41406b5d5638b42c4d8222cd03e76bbfeb86 does not ensure that all
  GHC-built object files have a default model of medium, and will raise an
  R_LARCH_B26 overflow error.
  

• 27cf7361
  by Matthew Craven at 2025-03-19T12:03:48-04:00

  Add interface-stability test for ghc-bignum
  
  As with ghc-prim, it makes sense to have some protection against
  accidental interface changes to this package caused by changes
  in ghc-internal.
  

• 25d46547
  by Matthew Craven at 2025-03-19T12:03:48-04:00

  Add README reference for the interface-stability tests
  

• 5d65393e
  by Simon Peyton Jones at 2025-03-20T05:41:24-04:00

  Remove the Core flattener
  
  This big MR entirely removes the "flattener" that took a type and
  replaced each type-family application with a fresh type variable.
  The flattener had its origin in the paper
       Injective type families for Haskell
  
  But (a) #25657 showed that flattening doesn't really work.
      (b) since we wrote the paper we have introduced the so-called
          "fine-grained" unifier GHC.Core.Unify, which can return
                   * SurelyApart
                   * Unifiable subst
                   * MaybeApart subst
          where the MaybeApart says that the two types are not unifiable by a
          substitution, but could (perhaps) be unified "later" after some type
          family reductions.  This turns out to subsume flattening.
  
  This MR does a major refactor of GHC.Core.Unify to make it capable of
  subsuming flattening.   The main payload is described in
         Note [Apartness and type families]
  and its many wrinkles.
  
  The key (non-refactoring) implementation change is to add `um_fam_env`
  to the `UMState` in the unification monad.
  
  Careful review with Richard revealed various bugs in the treament of
  `kco`, the kind coercion carried around by the unifier, so that is
  substantially fixed too: see Note [Kind coercions in Unify].
  
  Compile-time performance is improved by 0.1% with a few improvements over
  1% and one worsening by 1.3% namely T9872a.  (I have not investigated the
  latter.)
  
  Metric Decrease:
      T9872b
      T9872c
      TcPlugin_RewritePerf
  Metric Increase:
      T9872a
  

• 9003ef0a
  by sheaf at 2025-03-20T05:42:08-04:00

  Remove SDoc from UnknownSubordinate/MissingBinding
  
  This commit replaces unstructured SDoc arguments in error message constructors
  with uses of the following two datatypes:
  
    - SigLike: for different kinds of signatures (e.g. standalone kind signatures,
      fixity signatures, COMPLETE pragmas, etc)
    - Subordinate: for class methods, associated types, and record fields
  
  The following error message constructors now no longer have any SDocs in them:
  
    - TcRnIllegalBuiltinSyntax: SDoc -> SigLike
    - MissingBinding: SDoc -> SigLike
    - UnknownSubordinate: SDoc -> (Name, Subordinate)
    - SuggestMoveToDeclarationSite: SDoc -> SigLike
  

• 4329f3b6
  by sheaf at 2025-03-20T05:42:08-04:00

  Remove SDocs from HsDocContext
  
  This commit removes the remaining SDocs from the HsDocContext data type.
  It adds the following constructors:
  
    ClassInstanceCtx  -- Class instances
    ClassMethodSigCtx -- Class method signatures
    SpecialiseSigCtx  -- SPECIALISE pragmas
    PatSynSigCtx      -- Pattern synonym signatures
  
  We now report a bit more information for errors while renaming class instances,
  which slightly improves renamer-emitted error messages.
  

• 75c29aa1
  by sheaf at 2025-03-20T05:42:08-04:00

  Reject instance with non-class head in renamer
  
  This commit modifies rnClsInstDecl so that, when renaming, we reject a class
  instance declaration in which the head is not a class. Before this change, it
  would get rejected in the type-checker, but that meant that the renamer could
  emit unhelpful error messages, e.g.:
  
    data Foo m a
    instance Foo m where
      fmap _ x = case x of
  
  would rather unhelpfully say:
  
      ‘fmap’ is not a (visible) method of class ‘Foo’
  
  when of course 'Foo' is not even a class. We now reject the above program
  with the following error message:
  
      Illegal instance for data type ‘Foo’.
      Instance heads must be of the form
        C ty_1 ... ty_n
      where ‘C’ is a class.
  
  Fixes #22688
  

• a8f543a9
  by Cheng Shao at 2025-03-20T18:47:19-04:00

  testsuite: mark T7919 as fragile on i386 as well
  
  T7919 may also fail i386 CI jobs with test timeout.
  

• 256ac29c
  by sheaf at 2025-03-20T18:48:07-04:00

  Don't cache solved [W] HasCallStack constraints
  
  This commit ensures we do not add solved Wanted constraints that mention
  HasCallStack or HasExceptionContext constraints to the set of solved
  Wanted dictionary constraints: caching them is invalid, because re-using
  such cached dictionaries means using an old call-stack instead of
  constructing a new one, as was reported in #25529.
  
  Fixes #25529.
  

• 47646ce2
  by Andrew Lelechenko at 2025-03-20T18:48:43-04:00

  Improve haddock-visible documentation for GHC.Driver.Flags
  

• 2e4e15ed
  by Sylvain Henry at 2025-03-21T17:49:36-04:00

  Document -fnum-constant-folding (#25862)
  

• 044a6e08
  by sheaf at 2025-03-21T17:50:24-04:00

  LLVM: fix typo in padLiveArgs
  
  This commit fixes a serious bug in the padLiveArgs function, which
  was incorrectly computing too many padding registers. This caused
  segfaults, e.g. in the UnboxedTuples test.
  
  Fixes #25770
  Fixes #25773
  

• 1745c749
  by Teo Camarasu at 2025-03-22T18:42:37-04:00

  template-haskell: remove Language.Haskell.TH.Lib.Internal
  
  This module is purely used for the implementation of TH quote
  desugarring.
  
  Historically this needed to be exposed from `template-haskell`, since
  that's the package that the desugarred expressions referenced but since
  https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12479, this is no
  longer the case.
  
  Now these identifiers are in `ghc-internal`.
  
  Note that this module has carried the following warning for a long time:
  
  > This is not a part of the public API, and as such, there are no API guarantees for this
  module from version to version.
  
  Resolves #24766
  

• 3bc507db
  by Alan Zimmerman at 2025-03-22T18:43:13-04:00

  EPA: Fix exact printing of SPECIALISE pragma
  
  This commit fixes two minor issues with exactprinting of the
  SPECIALISE pragma after !12319 landed
  
  - The span for the RHS did not include the optional signature type
  - The `::` was printed twice when the legacy path was used
  
  Closes #25885
  

• bdf93da8
  by sheaf at 2025-03-24T11:25:12+01:00

  Renamer: improve handling of export children
  
  This commit refactors the 'childGREPriority' function which is used when
  renaming subordinate items in export lists and class declarations.
  
  Instead of having a complicated LookupChild parameter, we now simply pass the
  GREInfo of the parent, which allows us to decide what is a valid child:
  
    - classes can have children that are in the type constructor namespace,
    - promoted data constructors should be treated the same as normal data
      constructors.
  
  Fixes #24027
  

• 1dbc7846
  by Matthew Pickering at 2025-03-24T15:35:17-04:00

  Revert "mk-ghcup-metadata: Clean up and add type annotations"
  
  This reverts commit 64ea68d9a206ec4db5020b0a3fc563199ab18be3.
  
  See #25889
  

• 6941c825
  by doyougnu at 2025-03-25T10:05:58-04:00

  base: construct compat RTSFlags
  
  -- see CLC #289
  

• 730e6f77
  by doyougnu at 2025-03-25T10:06:02-04:00

  base: construct compat GHC.Stats
  
  -- see CLC #289
  

• cd9e6605
  by Ben Gamari at 2025-03-25T17:59:52-04:00

  rel_eng/upload: Clarify usage directions
  
  Previously it was not made clear that the directory name is significant.
  

• 7d18c19b
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  ghci: make the Pipe type opaque
  
  This commit makes the Pipe type in ghci opaque, and introduce the
  mkPipeFromHandles constructor for creating a Pipe from a pair of
  Handles. Pipe is now just a pair of receiver/sender continuations
  under the hood. This allows a Pipe to be potentially backed by other
  IPC mechanisms (e.g. WebSockets) which is essential for wasm ghci
  browser mode.
  

• a2103fd2
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  ghci: use improved Pipe logic for wasm iserv
  
  This commit makes wasm iserv take advantage of the Pipe refactoring by
  passing binary receiver/sender js callbacks from the dyld script. This
  paves the way for piping the binary messages through WebSockets in
  order to run wasm iserv in the browser, but more importantly, it
  allows us to get rid of a horrible hack in the dyld script: we no
  longer have to fake magical wasi file descriptors that are backed by
  nodejs blocking I/O! The legacy hack was due to these facts:
  
  - iserv only supported exchanging binary messages via handles backed
    by file descriptors
  - In wasi you can't access host file descriptors passed by host ghc
  - The nodejs wasi implementation only allows mapping host directories
    into the wasi vfs, not host file descriptors
  - Named pipes with file paths (mkfifo) doesn't work well with nodejs
    wasi implementation, causes spurious testsuite failures on macos
  
  But starting from this point, we can fully take advantage of
  non-blocking I/O on the js side.
  

• fa2fbd2b
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  ghci: fix ^C handling for wasm iserv
  
  This commit fixes ^C handling for wasm iserv. Previously we didn't
  handle it at all, so ^C would kill the node process and host ghc would
  then crash as well. But native ghc with external interpreter can
  handle ^C just fine and wasm should be no different. Hence the fix:
  wasm iserv exports its signal handler as a js callback to be handled
  by the dyld script. Also see added note for details.
  

• efcebed6
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: fix post-link.mjs for browser
  
  The wasm ghci browser mode needs to run dyld.mjs in the browser which
  imports post-link.mjs. This script makes post-link.mjs runnable in the
  browser by deferring node-specific module imports to their actual use
  sites.
  

• 27bb73c6
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: use console.assert in dyld script
  
  This commit uses console.assert() instead of node-specific strict
  assert in the dyld script, in order to make it runnable in the
  browser. console.assert() only warns and doesn't crash upon assertion
  failure, but this is fine; we can always trivially define a strict
  assert function shall it be necessary when debugging, and there hasn't
  been such an assertion failure seen in the wild for long enough.
  

• 929df0ba
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: asyncify the dylink.0 custom section parser
  
  This commit refactors the simple binary parser in the dyld script in
  charge of parsing the dylink.0 custom section. Previously the parser
  was synchronous and operated on the entire input buffer; this was
  simple and easy and worked well enough when the input wasm modules are
  instantly read from local filesystem.
  
  However, when running dyld in the browser, the wasm modules are
  transferred via fetch() requests. The host ghc and the browser might
  not be on the same machine, so slow network uplink does need to be
  considered. We only need to parse dylink.0 custom section to extract
  dependency info, and dylink.0 is the very first custom section in the
  wasm shared library binary payload, so the parsing process should not
  require fetch() to complete and should return the parsing result asap.
  
  Hence the refactorings in this commit: asyncify the parser, make it
  only consume as many bytes as needed by invoking an async consumer
  callback. The input is a readable stream from the fetch() response;
  once the response is available, the async wasm compilation can start
  in the background, and dylink.0 parsing shall end asap which results
  in more wasm shared libraries to be loaded earlier. Profit.
  

• 9a697181
  by Cheng Shao at 2025-03-25T22:00:56+00:00

  wasm: fix dyld setImmediate usage in browser
  
  The wasm dyld script used to only run in node and directly uses
  setImmediate in globalThis. In case of browsers, it needs to import
  setImmediate from the prelude, hence this commit.
  

• d9b71e82
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: fix dyld downsweep filepath handling in browser
  
  The wasm dyld downsweep logic used to rely on nodejs path module to
  handle filepaths. That's not available in browsers, so this commit
  implements poor man's filepath handling in js, which is not elegant
  for sure but works for both nodejs and the browser.
  

• 7003a399
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: isolate nodejs-specific logic with the isNode flag in dyld
  
  As we move towards supporting running the dyld script in the browser,
  this commit implements the isNode module-level binding which is true
  if dyld is running in nodejs. The nodejs-specific bits are gated under
  isNode.
  
  For the browser case, this commit introduces @bjorn3/browser_wasi_shim
  as the wasi implementation; we already use it in quite a few projects
  and it simply works.
  

• 22ba2a78
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: isolate dyld side effects that might require IPC
  
  This commit spins out a DyLDHost class from DyLD that handles side
  effects that must be run in the same host environment that runs
  wasm32-wasi-ghc. When the dyld script runs in the browser, it'll need
  to do IPC to find libraries, fetch wasm library, etc, and the other
  side of dyld that runs on nodejs would simply expose the DyLDHost
  methods as endpoints for WebSockets/HTTP.
  

• e93fc33d
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: implement wasm ghci browser mode
  
  This commit implements the rest of dyld logic that delivers the ghci
  browser mode:
  
  - The dyld script can now fully run in the browser. It communicates
    back with dyld-on-nodejs via WebSockets and also plain HTTP 1.1
    requests.
  - The host dyld starts a server and acts as a broker between the GHC
    process and the browser side. GHC doesn't need to know anything
    about the browser mode; no driver flags need to be added and no
    recompilation needs to happen, the GHC driver continues to use the
    original iserv binary messages protocol.
  - The dyld broker doesn't need to parse any message between the
    browser dyld and GHC; it merely sets up WebSockets connections to
    redirect these messages as well as ^C signals.
  - Plain HTTP 1.1 is used for IPC requests (e.g. downloading a wasm
    module).
  - The dyld broker serves a main.js script that bootstraps iserv in the
    browser, and a main.html empty page playground for testing. CORS is
    enabled so it could be possible to inject iserv into other websites
    and use ghci to play with them.
  - All the RPC logic is opaque to the DyLD class, the majority of the
    wasm dynamic linker code is already portable and runs fine in
    firefox/chrome/webkit.
  
  Closes #25399.
  

• fc576798
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: add puppeteer/playwright support for ghci browser mode
  
  This commit adds support for using puppeteer/playwright for
  automatically launching a headless browser that backs the ghci browser
  mode. This is useful for testing the ghci browser mode as a part of
  GHC testsuite, and it's also convenient for local development since
  the step to start iserv can be automated away.
  

• ad7e271d
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: support wasi console redirect for the ghci browser mode
  
  This commit adds optional support for redirecting wasi console
  stdout/stderr back to the host when running wasm ghci browser mode. By
  default, the wasi console outputs are only available under F12
  devtools console, but in case of testing against a mobile browser, the
  devtools console may not be readily available, and it would be more
  convenient to at least get wasi console output on the host side.
  
  The redirection logic is simple, just adding another two WebSockets
  connections that pump the line-buffered textual messages back to
  host.
  

• 731217ce
  by Cheng Shao at 2025-03-25T22:00:57+00:00

  wasm: add brotli compression for ghci browser mode
  
  This commit adds brotli compression for wasm shared libraries for ghci
  browser mode. With BROTLI_MIN_QUALITY, the overhead is negligible, and
  it helps reducing amount of transferred data when the browser connects
  to the server over a slow connection.
  

• ac70e643
  by Cheng Shao at 2025-03-26T13:37:19+00:00

  testsuite: add browser001 test for wasm ghci browser mode
  
  This commit adds support for testing the wasm ghci browser mode in the
  testsuite, as well as a simple first test case browser001 that makes
  use of TH, JSFFI and browser-specific DOM API. See added note and
  comments for details.
  

• 6ef5c0d2
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  docs: add wasm ghci subsection in user manual
  
  This commit updates the user manual to add wasm ghci subsection.
  

• 37381bcf
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  docs: update Note [The Wasm Dynamic Linker]
  
  This commit updates Note [The Wasm Dynamic Linker] to reflect recent
  developments, in particular the wasm ghci browser mode.
  

• 4b5a0f61
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  ci: bump DOCKER_REV and test wasm ghci browser mode
  
  This commit bumps the ci-images revision for updated wasm toolchain,
  and adds the launch options required to test wasm ghci browser mode.
  

• c6a3bc8f
  by Cheng Shao at 2025-03-26T13:37:24+00:00

  driver: implement wasm ghci browser mode flags
  
  This commit implements GHC driver flags that enable the wasm ghci
  browser mode.
  

• f75e823e
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  rts: add hs_try_putmvar_with_value to RTS API
  
  This commit adds hs_try_putmvar_with_value to rts. It allows more
  flexibility than hs_try_putmvar by taking an additional value argument
  as a closure to be put into the MVar. This function is used & tested
  by the wasm backend runtime, though it makes sense to expose it as a
  public facing RTS API function as well.
  

• 9cd9f347
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  wasm: use MVar as JSFFI import blocking mechanism
  
  Previously, when blocking on a JSFFI import, we push a custom
  stg_jsffi_block stack frame and arrange the `promise.then` callback to
  write to that stack frame. It turns out we can simply use the good old
  MVar to implement the blocking logic, with a few benefits:
  
  - Less maintenance burden. We can drop the stg_jsffi_block related Cmm
    code without loss of functionality.
  - It interacts better with existing async exception mechanism. throwTo
    would properly block the caller if the target thread is masking
    async exceptions.
  

• da34f0aa
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  wasm: properly pin the raiseJSException closure
  
  We used to use keepAlive# to pin the raiseJSException closure when
  blocking on a JSFFI import thunk, since it can potentially be used by
  RTS. But raiseJSException may be used in other places as well (e.g.
  the promise.throwTo logic), and it's better to simply unconditionally
  pin it in the JSFFI initialization logic.
  

• dc904bfd
  by Cheng Shao at 2025-03-26T18:01:54-04:00

  wasm: implement promise.throwTo() for async JSFFI exports
  
  This commit implements promise.throwTo() for wasm backend JSFFI
  exports. This allows the JavaScript side to interrupt Haskell
  computation by raising an async exception. See subsequent docs/test
  commits for more details.
  

• 7f80455e
  by Cheng Shao at 2025-03-26T18:01:55-04:00

  testsuite: add test for wasm promise.throwTo() logic
  
  This commit adds a test case to test the wasm backend
  promise.throwTo() logic.
  

• afdd3fe7
  by Cheng Shao at 2025-03-26T18:01:55-04:00

  docs: document the wasm backend promise.throwTo() feature
  

• 65dc65dc
  by sheaf at 2025-03-26T18:02:43-04:00

  Refactor CtEvidence into Given/Wanted
  
  This commit is a simple refactoring which splits up the CtEvidence,
  giving each constructor its own datatype:
  
    data CtEvidence
      = CtGiven  GivenCtEvidence
      | CtWanted WantedCtEvidence
  
    data GivenCtEvidence =
      GivenCt
        { ctev_pred :: TcPredType
        , ctev_evar :: EvVar
        , ctev_loc  :: CtLoc }
  
    data WantedCtEvidence =
      WantedCt
        { ctev_pred      :: TcPredType
        , ctev_dest      :: TcEvDest
        , ctev_loc       :: CtLoc
        , ctev_rewriters :: RewriterSet }
  
  This enables a few minor simplifications in the code, notably removing
  a panic from GHC.Tc.Solver.Solve.solveWantedForAll_implic.
  
  Fixes #25848
  

• ada04031
  by sheaf at 2025-03-26T18:03:27-04:00

  Export lists: same prio for NoParent & RightParent
  
  This commit ensures that, when we are renaming children in an export
  list item such as
  
    module M ( P(A,B,C) )
  
  we consider children with NoParent to have the same priority as children
  which have the correct parent (P in this case). This is because we
  should **not** prioritise a data constructor (with the right parent)
  over a pattern synonym we are bundling (which, before bundling, has
  no parent).
  
  Fixes #25892
  

• 721628a0
  by Adriaan Leijnse at 2025-03-27T09:10:10-04:00

  TTG: Replace HsUnboundVar with HsHole
  
  Context:
  
  The HsUnboundVar constructor in Language.Haskell.Syntax.Expr contained a
  RdrName, which stood in the way of the work towards a dedicated
  haskell-syntax library. The constructor was overloaded for unbound
  variables, anonymous and named holes, and parse errors.
  
  This commit:
  
  Replaces HsUnboundVar with HsHole. In the surface syntax HsHole only
  represents an anonymous expression hole ("_"). It is extended with the
  XHole type family.
  
  In the concrete GHC implementation of the language on the other hand,
  HsHole is used for "any thing which is not necessarily a valid or fully
  defined program fragment, but for which a type can be derived". This use
  is similar to how HsUnboundVar was used, but the parse error case is now
  made explicit with a ParseError case for XHole. This is in anticipation
  of future work on a fault tolerant compilation pipeline.
  

• dbd852f5
  by Ben Gamari at 2025-03-27T09:10:48-04:00

  rel_eng: Finish removal of CentOS jobs
  
  Remove centos7 from release fetch and ghcup metadata generation scripts.
  
  Closes #25893.
  

• 0e0231e7
  by Matthew Pickering at 2025-03-28T18:36:33-04:00

  hadrian: Make hash_unit_ids into a flavour transformer (and enable for release flavour)
  
  The primary reason for this change is to make the `release` flavour
  enable `--hash-unit-ids` by default without any further user intervention.
  
  * Packagers don't have to be aware of this special flag they should be
    using.
  * release builds on CI are uniformly testing with hashes (see !13418)
  
  Fixes #25379
  

• 9fc54c12
  by Rodrigo Mesquita at 2025-03-28T18:37:10-04:00

  driver: Move DynFlags consistency fixes off Main
  
  These consistency fixes found in Main.hs are required for the proper
  functioning of the compiler and should live together with all remaining
  fixes in `makeDynFlagsConsistent`.
  
  This is especially relevant to GHC applications that shouldn't have to
  copy/fix themselves possibly inconsistent DynFlags.
  
  Additionally, outputs information when verbosity is high about these
  consistency fixes that were previously quiet, adds information to the
  Note on consistency of DynFlags, and improves one of the fixes that
  incorrectly used `dynNow`.
  

• 2fdd0be9
  by sheaf at 2025-03-28T18:37:53-04:00

  Remove GhcHint from TcRnNotInScope constructor
  
  This is a tiny refactoring which:
  
    - removes GhcHint/ImportError fields from some constructors of
      TcRnMessage, using the TcRnMessageDetailed mechanism instead to
      report this informaiton:
        - removes the GhcHint and ImportErrors fields from TcRnNotInScope
        - removes the GhcHint field from TcRnTermNameInType
    - ensures that we only include these hints and import errors when the
      -fhelpful-errors flag is turned on
  
  Fixes #25874
  

• 9e5cd064
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  Better support for SSE3 and SSE4.1
  
  In particular:
  
  * Pass appropriate attributes to LLVM
  * Define preprocessor macros for them
  

• c2c7dd51
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  x86: Add support for SSSE3
  
  This commit adds the `-mssse3` flag, which controls usage of SSSE3 instructions in x86 code generation.
  

• d7c62580
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  x86 NCG SIMD: Implement 128-bit integer vector arithmetics
  
  This commit implements the following operations on integer vectors:
  
  * negateIntNXM#
  * plus{Int,Word}NXM#
  * minus{Int,Word}NXM#
  * times{Int,Word}NXM#
  * quot{Int,Word}NXM#
  * rem{Int,Word}NXM#
  * min{Int,Word}NXM#
  * max{Int,Word}NXM#
  
  where (N,M) is one of (8,16), (16,8), (32,4), or (64,2).
  
  Closes #25643
  

• f5ea4e7e
  by ARATA Mizuki at 2025-03-31T14:53:34-04:00

  x86 NCG SIMD: Implement 128-bit integer vector shuffle
  
  This commit implements the following operations:
  
  * shuffle{Int,Word}8X16#
  * shuffle{Int,Word}16X8#
  * shuffle{Int,Word}32X4#
  * shuffle{Int,Word}64X2#
  
  See #25643
  

• 5eeb6645
  by Simon Peyton Jones at 2025-03-31T14:54:16-04:00

  Re-jig the way that the Simplifier tries RULES
  
  As #25170 showed, if a new RULE appears, it could change the simplifier's
  behaviour a bit, even if it never fires; and that messes up deterministic
  compilation.  (This was particularly nasty if the rule wasn't even transitively
  below the module being compiled.)
  
  This MR rejigs the use of `tryRules` so that behaviour does not change
  when a new, unrelated RULE is added.  It's described in
  
  * Note [When to apply rewrite rules]
  * Note [tryRules: plan (BEFORE)]
  * Note [tryRules: plan (AFTER)]
  
  The main change is in the refactored version of
    * simplOutId
    * rebuildCall
  The little state machine that was embedded in ArgInfo is gone.
  
  As I wandered around the Simplifier I also found opportunities for
  some loosely-related refactoring:
  
  * In several places, the /substitution/ in the SimpleEnv is empty;
    all we care about is the in-scope set and the flags.  So
    - I made a synonym `SimplEnvIS` that embodies that invariant,
    - used it in a number of type signatures (notably `rebuild`)
    - added some assertion checks (via `checkSimlEnvIS`)
  
  * I moved the hanlding of `runRW` out of `rebuildCall` (where we
    would have to test repeatedly) and into the new `simplOutId`, which
    fires up `rebuildCall`. Now it is only tested once.
  
  -------------------------
  Metric Decrease:
      T9020
      T9961
  -------------------------
  

• f534474a
  by sheaf at 2025-03-31T14:54:59-04:00

  Add comment: no qualified Names in the LocalRdrEnv
  
  This commit adds a reference to section 5.5.1 of the Haskell 2010 report,
  to explain that qualified names can't occur in the LocalRdrEnv.
  
  Fixes #25875
  

• d5ea80c6
  by Patrick at 2025-03-31T14:55:42-04:00

  Fix deadlock/loop in interface rehydration (#25858)
  
  In #25858, GHC hangs when processing modules with class defaults due to a
  circular dependency in the interface rehydration process. The deadlock/loop
  occurred when eager class defaults rehydration accessed not-yet-complete module details.
  
  To fix the immediate deadlock/loop.
  `tcIfaceDefaults` is refactored, we use the class name directly from the iface
  and use `forM` for lazy loading the class, which algins with the handling of other fields
  of ModDetails. This laziness ensure rehydration waits for HomePackageTable (HPT) to
  be updated and prevent premature evaluation of ModDetails inside `fixIO``.
  
  As suggested by Matthew, class defaults importing is also refactored
  to align with the compiler's established interface loading conventions.
  - add class defaults field to ExternalPackageState (EPS).
  - rehydrate and store class defaults in EPS at `loadInterface`.
  - Instead of using `tcIfaceDefaults` in `tcRnImports`, we add and use
    `tcGetClsDefaults` to read defaults directly from HPT or EPS
    when importing modules.
  
  Tests:
  - T25858, T25858v1-2: Test class hydration in defaults
  - T25858v3-4: Test type list hydration in defaults
  
  New Note [Tricky rehydrating IfaceDefaults loop] is added.
  
  Thanks to @sheaf (Sam), @mpickering (Matthew), and @simonpj (Simon) for their
  valuable input and analysis.
  
  Fixes #25858.
  

• 2d419d8d
  by Matthew Pickering at 2025-04-02T16:12:36-04:00

  Use unsafePerformIO in definition of computeFingerprint
  
  computeFingerprint is morally a pure function, which is implemented by
  mutating a buffer. Using unsafePerformIO inside the definition allows it
  to be used in pure contexts, fixing one place where an ad-hoc call to
  unsafePerformIO is already needed.
  

• ccdf979b
  by Matthew Pickering at 2025-04-02T16:12:37-04:00

  driver: Fix recompilation checking for exported defaults
  
  Since the exported defaults are not associated with any identifier from
  the module, they are just added to the export hash rather than
  the fine-grained recompilation logic.
  
  Fixes #25855
  

• c5bf9892
  by Matthew Pickering at 2025-04-02T16:12:37-04:00

  driver: Fix recompilation checking for COMPLETE pragmas
  
  A {-# COMPLETE P, Q #-} pragma is associated with the pattern synonyms P
  and Q during recompilation checking. Therefore, the existence of a
  pattern synonym becomes part of the ABI hash for P and Q.
  
  Then if a module uses these pattern synonyms and a complete pragma
  changes, it will trigger recompilation in that module.
  
  Fixes #25854
  

• d0fd9370
  by sheaf at 2025-04-02T16:14:05-04:00

  Handle named default exports separately
  
  This commit changes the way we check for duplicate exports of named
  default declarations. They are now treated entirely separately from
  other exports, because in an export list of the form
  
    module M ( default Cls, Cls )
  
  the default declaration does not export the class 'Cls', but only its
  default declarations.
  
  Also fixes a bug in Backpack where named default exports were getting
  dropped entirely. No test for that.
  
  Fixes #25857
  

• 62d04494
  by Cheng Shao at 2025-04-03T05:56:17-04:00

  ci: add x86_64-linux-ubuntu24_04 nightly/release jobs
  

• 327952e4
  by Cheng Shao at 2025-04-03T05:56:17-04:00

  rel-eng: add ubuntu24_04 bindists to ghcup metadata and fetch gitlab scripts
  

• aa1e3b8b
  by sheaf at 2025-04-03T05:57:24-04:00

  GHC settings: always unescape escaped spaces
  
  In #25204, it was noted that GHC didn't properly deal with having
  spaces in its executable path, as it would compute an invalid path
  for the C compiler.
  
  The original fix in 31bf85ee49fe2ca0b17eaee0774e395f017a9373 used a
  trick: escape spaces before splitting up flags into a list. This fixed
  the behaviour with extra flags (e.g. -I), but forgot to also unescape
  for non-flags, e.g. for an executable path (such as the C compiler).
  
  This commit rectifies this oversight by consistently unescaping the
  spaces that were introduced in order to split up argument lists.
  
  Fixes #25204
  

• 34a9b55d
  by lazyLambda at 2025-04-04T06:22:26-04:00

  Driver: make MonadComprehensions imply ParallelListComp
  
  This commit changes GHC.Driver.Flags.impliedXFlags to make the
  MonadComprehensions extension enable the ParallelListComp extension.
  
  Fixes #25645
  

• d99eb7cd
  by sheaf at 2025-04-04T06:23:28-04:00

  NamedDefaults: handle poly-kinded unary classes
  
  With this commit, we accept named default declarations for poly-kinded
  classes such as Typeable, e.g.
  
    default Typeable (Char)
  
  This used to fail because we assumed the kind of the class was monomorphic,
  e.g.
  
    Type -> Constraint
    (Type -> Type) -> Constraint
    Nat -> Constraint
  
  Now, we can handle a simple polymorphic class such as
  
    Typeable :: forall k. k -> Constraint
  
  Note that we keep the restriction that the class must only have
  one visible argument.
  
  This is all explained in the new Note [Instance check for default declarations]
  in GHC.Tc.Gen.Default.
  
  Fixes #25882
  

• 4cbc90de
  by sheaf at 2025-04-04T11:39:05-04:00

  LLVM: add type annotations to AtomicFetch_cmm.cmm
  

• e2237305
  by sheaf at 2025-04-04T11:39:05-04:00

  Cmm lint: lint argument types of CallishMachOps
  
  This commit adds a new check to Cmm lint to ensure that the argument
  types to a CallishMachOp are correct. The lack of this check was
  detected in the AtomicFetch test: the literals being passed as the
  second arguments to operations such as 'fetch_add', 'fetch_and'... were
  of the wrong width, which tripped up the LLVM backend.
  

• 9363e547
  by Cheng Shao at 2025-04-04T11:39:50-04:00

  ci: add ghc-wasm-meta integration testing jobs
  
  This patch adds ghc-wasm-meta integration testing jobs to the CI
  pipeline, which are only triggered via the `test-wasm` MR label or
  manually when the `wasm` label is set.
  
  These jobs will fetch the wasm bindists and test them against a
  variety of downstream projects, similarly to head.hackage jobs for
  native bindists, offering a convenient way to catch potential
  downstream breakage while refactoring the wasm backend.
  

• 27029e60
  by Adam Gundry at 2025-04-04T11:40:36-04:00

  base: Minor fixes to GHC.Records haddocks
  
  This corrects a stale reference to OverloadedRecordFields (which should
  be OverloadedRecordDot), fixes the haddock link syntax and adds an
  @since pragma.
  

• f827c4c6
  by Rodrigo Mesquita at 2025-04-07T11:22:10-04:00

  Parametrize default logger action with Handles
  
  Introduce `defaultLogActionWithHandles` to allow GHC applications to use
  GHC's formatting but using custom handles.
  
  `defaultLogAction` is then trivially reimplemented as
  ```
  defaultLogActionWithHandles stdout stderr
  ```
  

• 5dade5fd
  by sheaf at 2025-04-07T11:23:02-04:00

  Finer-grained recompilation checking for exports
  
  This commit refines the recompilation checking logic, to avoid
  recompiling modules with an explicit import list when the modules they
  import start exporting new items.
  
  More specifically, when:
  
    1. module N imports module M,
    2. M is changed, but in a way that:
        a. preserves the exports that N imports
        b. does not introduce anything that forces recompilation downstream,
           such as orphan instances
  
  then we no longer require recompilation of N.
  
  Note that there is more to (2a) as initially meets the eye:
  
    - if N includes a whole module or "import hiding" import of M,
      then we require that the export list of M does not change,
    - if N only includes explicit imports, we check that the imported
      items don't change, e.g.
  
        - if we have @import M(T(K, f), g)@, we must check that N
          continues to export all these identifiers, with the same Avail
          structure (i.e. we should error if N stops bundling K or f with
          T)
        - if we have @import M(T(..))@, we must check that the children
          of T have not changed
  
  See Note [When to recompile when export lists change?] in GHC.Iface.Recomp.
  
  This is all tested in the new tests RecompExports{1,2,3,4,5}
  
  Fixes #25881
  

• f32d6c2b
  by Andreas Klebinger at 2025-04-07T22:01:25-04:00

  NCG: AArch64 - Add -finter-module-far-jumps.
  
  When enabled the arm backend will assume jumps to targets outside of the
  current module are further than 128MB away.
  
  This will allow for code to work if:
  * The current module results in less than 128MB of code.
  * The whole program is loaded within a 4GB memory region.
  
  We have seen a few reports of broken linkers (#24648) where this flag might allow
  a program to compile/run successfully at a very small performance cost.
  
  -------------------------
  Metric Increase:
      T783
  -------------------------
  

• 553c280b
  by Andreas Klebinger at 2025-04-07T22:02:11-04:00

  Revert "rts: fix small argument passing on big-endian arch (fix #23387)"
  
  Based on analysis documented in #25791 this doesn't fully fix the big
  while introducing new bugs on little endian architectures.
  
  A more complete fix will have to be implemented to fix #23387
  
  This reverts commit 4f02d3c1a7b707e609bb3aea1dc6324fa19a5c39.
  

• b0dc6599
  by Andreas Klebinger at 2025-04-07T22:02:11-04:00

  Interpreter: Fixes to handling of subword value reads/writes.
  
  Load subword values as full words from the stack truncating/expanding as
  neccesary when dealing with subwords. This way byte order is implicitly
  correct.
  
  This commit also fixes the order in which we are pushing literals onto
  the stack on big endian archs.
  
  Last but not least we enable a test for ghci which actually tests these
  subword operations.
  

• ed38c09b
  by Cheng Shao at 2025-04-07T22:02:53-04:00

  testsuite: don't test WasmControlFlow stdout
  
  This patch solves a potential test flakiness in `WasmControlFlow` by
  removing `WasmControlFlow.stdout` which is not so portable/stable as
  it seems. See added `Note [WasmControlFlow]` for more detailed
  explanation.
  

• f807c590
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  debugger: Add docs to obtainTermFromId
  

• 5dba052d
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  Move logic to find and set Breakpoint to GHC
  
  Breakpoints are uniquely identified by a module and an index unique
  within that module. `ModBreaks` of a Module contains arrays mapping from
  this unique breakpoint index to information about each breakpoint. For
  instance, `modBreaks_locs` stores the `SrcSpan` for each breakpoint.
  
  To find a breakpoint using the line number you need to go through all
  breakpoints in the array for a given module and look at the line and
  column stored in the `SrcSpan`s. Similarly for columns and finding
  breakpoints by name.
  
  This logic previously lived within the `GHCi` application sources,
  however, it is common to any GHC applications wanting to set
  breakpoints, like the upcoming `ghc-debugger`.
  
  This commit moves this logic for finding and setting breakpoints to the
  GHC library so it can be used by both `ghci` and `ghc-debugger`.
  

• bc0b9f73
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  Refactor and move logic for identifier breakpoints
  
  Breakpoints can be set on functions using syntax of the form
  `[Module.]function`. The parsing, resolution (e.g. inferring implicit
  module), and validation of this syntax for referring to functions was
  tightly coupled with its GHCi use.
  
  This commit extracts the general purpose bits of resolving this syntax
  into `GHC.Runtime.Debugger.Breakpoints` so it can be further used by
  other GHC applications and to improve the code structure of GHCi.
  
  Moreover, a few utilities that do splitting and joining of identifiers
  as strings were moved to `GHC.Runtime.Eval.Utils`, which also can be
  used in the future to clean up `GHC.Runtime.Eval` a bit.
  

• 4f728d21
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  debugger: derive Ord for BreakpointIds
  

• 5528771c
  by Rodrigo Mesquita at 2025-04-08T17:41:51-04:00

  debugger: Move context utils from GHCi to GHC
  
  Moves `enclosingTickSpan`, `getCurrentBreakSpan`, and
  `getCurrentBreakModule`, general utilities on the internal debugger
  state, into the GHC library.
  

• 4871f543
  by sheaf at 2025-04-08T17:42:43-04:00

  Implicit quantification in type synonyms: add test
  
  This adds a test for ticket #24090, which involves implicit
  quantification in type synonyms.
  The underlying issue was fixed in 0d4ee209dfe53e5074d786487f531dabc36d561c.
  

• 48917d3c
  by sheaf at 2025-04-08T17:42:44-04:00

  Turn on implicit-rhs-quantification by default
  
  This flag was added to GHC 9.8, and will be removed in a future GHC
  release. In preparation, this commit adds it to the default warning
  flags.
  

• 629be068
  by Rodrigo Mesquita at 2025-04-08T17:43:26-04:00

  debugger: Add breakpoints to every Stmt
  
  While single-stepping through a Haskell program we stop at every
  breakpoint. However, we don't introduce breakpoints at every single
  expression (e.g. single variables) because they would be too many and
  uninteresting.
  
  That said, in a do-block, it is expected that stepping over would break
  at every line, even if it isn't particularly interesting (e.g. a single
  arg like getArgs). Moreover, let-statements in do-blocks, despite only
  being evaluated once needed, lead to surprising jumps while stepping
  through because some have outermost (outside the let) breakpoints
  while others don't.
  
  This commit makes every statement in a do-block have a breakpoint.
  This leads to predictable stepping through in a do-block.
  Duplicate breakpoints in the same location are avoided using the
  existing blacklist mechanism, which was missing a check in one relevant place.
  
  Fixes #25932
  

• 99a3affd
  by Matthew Pickering at 2025-04-08T17:44:08-04:00

  driver: refactor: Split downsweep and MakeAction into separate modules.
  
  This will facilitate using the downsweep functions in other parts of
  the compiler than just --make mode.
  
  Also, the GHC.Driver.Make module was huge. Now it's still huge but
  slightly smaller!
  

• ecfec4df
  by sheaf at 2025-04-09T14:13:12-04:00

  Store user-written qualification in the GhcRn AST
  
  This commit ensures we store the original user-written module
  qualification in the renamed AST. This allows us to take into account
  the user-written qualification in error messages.
  
  Fixes #25877
  

• 97c884e2
  by sheaf at 2025-04-09T14:13:12-04:00

  TcRnIllegalTermLevelUse: simpler error when possible
  
  This commit makes GHC emit a simple error message in the case of an
  illegal term-level use of a data constructor: we will try to report an
  out-of-scope error instead of a "Illegal term level use" error, as the
  latter might be a bit overwhelming for newcomers.
  
  We do this when we have a data constructor import suggestion to provide
  to the user. For example:
  
    module M where { data A = A }
  
    module N where
      import M(A)
  
      x = Bool
      -- Illegal term-level use of Bool
  
      y = A
      -- Data constructor not in scope: A.
      -- Perhaps add 'A' to the import list of 'M'.
  
  This commit also revamps the "similar names" suggestion mechanism,
  and in particular its treatment of name spaces. Now, which name spaces
  we suggest is based solely on what we are looking for, and no longer on
  the NameSpace of the Name we have. This is because, for illegal term-level
  use errors, it doesn't make much sense to change the suggestions based
  on the fact that we resolved to e.g. a type constructor/class; what
  matters is what we were expecting to see in this position.
  See GHC.Rename.Unbound.{suggestionIsRelevant,relevantNameSpace} as well
  as the new constructors to GHC.Tc.Errors.Types.WhatLooking.
  
  Fixes #23982
  

• bff645ab
  by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00

  driver: Split Session functions out of Main
  
  This commit moves out functions that help in creating and validating a
  GHC multi session from Main into the ghc library where they can be used by
  other GHC applications.
  
  Moreover, `Mode` processing and `checkOptions` linting were moved to
  separate modules within the ghc-bin executable package.
  
  In particular:
  
  - Move `Mode` types and functions (referring to the mode GHC is running
    on) to `ghc-bin:GHC.Driver.Session.Mode`
  
  - Move `checkOptions` and aux functions, which validates GHC DynFlags
    based on the mode, to `ghc-bin:GHC.Driver.Session.Lint`
  
  - Moves `initMulti`, `initMake`, and aux functions, which initializes a make/multi-unit
    session, into `ghc:GHC.Driver.Session.Units`.
  

• 501b015e
  by Rodrigo Mesquita at 2025-04-09T14:13:57-04:00

  docs: Improve haddock of ExecComplete
  

• dea98988
  by Andreas Klebinger at 2025-04-09T19:23:57-04:00

  Avoid oversaturing constructor workers.
  
  Constructor applications always need to take the exact number of
  arguments. If we can't ensure that instead apply the constructor worker
  like a regular function.
  
  Fixes #23865
  

• f1acdd2c
  by sheaf at 2025-04-09T19:25:41-04:00

  NamedDefaults: require the class to be standard
  
  We now only default type variables if they only appear in constraints
  of the form `C v`, where `C` is either a standard class or a class with
  an in-scope default declaration.
  
  This rectifies an oversight in the original implementation of the
  NamedDefault extensions that was remarked in #25775; that implementation
  allowed type variables to appear in unary constraints which had arbitrary
  classes at the head.
  
  See the rewritten Note [How type-class constraints are defaulted] for
  details of the implementation.
  
  Fixes #25775
  Fixes #25778
  

• 5712e0d6
  by Vladislav Zavialov at 2025-04-10T05:17:38+00:00

  Retry type/class declarations and instances (#12088)
  
  Retry type/class declarations and instances to account for non-lexical
  dependencies arising from type/data family instances.
  
  This patch improves the kind checker's ability to use type instances in kind
  checking of other declarations in the same module.
  
  * Key change: tcTyAndClassDecls now does multiple passes over the TyClGroups,
    as long as it is able to make progress.
    See the new Note [Retrying TyClGroups] in GHC.Tc.TyCl
  
  * Supporting change: FVs of a TyClGroup are now recorded in its extension
    field, namely XCTyClGroup.
    See the new Note [Prepare TyClGroup FVs] in GHC.Rename.Module
  
  * Instances are no longer inserted at the earliest positions where their FVs
    are bound. This is a simplification.
    See the new Note [Put instances at the end] in GHC.Rename.Module
  
  * Automatic unpacking is now more predictable, but fewer fields get unpacked
    by default. Use explicit {-# UNPACK #-} pragmas instead.
    See the new Note [Flaky -funbox-strict-fields with type/data families]
  
  For the wide range of newly accepted programs, consult the added test cases.
  
  Fixed tickets:
      #12088, #12239, #14668, #15561, #16410, #16448, #16693,
      #19611, #20875, #21172, #22257, #25238, #25834
  
  Metric Decrease:
      T8095
  

• bc73a78d
  by sheaf at 2025-04-10T15:07:24-04:00

  checkFamApp: don't be so eager to cycle break
  
  As remarked in #25933, a pure refactoring of checkTyEqRhs in
  ab77fc8c7adebd610aa0bd99d653f9a6cc78a374 inadvertently changed behaviour,
  as it caused GHC to introduce cycle-breaker variables in some
  unnecessary circumstances.
  
  This commit refactors 'GHC.Tc.Utils.Unify.checkFamApp' in a way that
  should restore the old behaviour, so that, when possible, we first
  recur into the arguments and only introduce a cycle breaker if this
  recursion fails (e.g. due to an occurs check failure).
  
  Fixes #25933
  

• 3acd8182
  by Andreas Klebinger at 2025-04-10T22:32:12-04:00

  Expand docs for RTS flag `-M`.
  
  The behaviour of how/when exceptions are raised was not really covered
  in the docs.
  

• 026c1a39
  by Adam Sandberg Ericsson at 2025-04-10T22:32:56-04:00

  add cases for more SchedulerStatus codes in rts_checkSchedStatus

• 5977c6a1
  by sheaf at 2025-04-10T22:33:46-04:00

  Squash warnings in GHC.Runtime.Heap.Inspect
  
  There were incomplete record selector warnings in GHC.Runtime.Heap.Inspect
  due to the use of the partial 'dataArgs' record selector. This is fixed
  by passing the fields to the 'extractSubTerms' function directly,
  rather than passing a value of the parent data type.
  

• 6a3e38f5
  by Andreas Klebinger at 2025-04-11T15:13:53-04:00

  hadrian: Make ghcWithInterpreter the universal source of truth about availability of the interpreter
  
  We were doing some ad-hoc checks in different places in hadrian to
  determine whether we supported the interprter or not. Now this check if
  confined to one function, `ghcWithInterpreter`, and all the places which
  use this information consult `ghcWithInterpreter` to determine what to
  do.
  
  Fixes #25533.
  

• 207de6f1
  by Matthew Pickering at 2025-04-11T15:14:37-04:00

  testsuite: Fix running TH tests with profiled dynamic compiler
  
  Previously, I had failed to update the ghc_th_way_flags logic for the
  profiled dynamic compiler.
  
  In addition to this `ghc_dynamic` was incorrectly set for profiled
  dynamic compiler.
  
  I also updated MultiLayerModulesTH_OneShot test to work for any compiler
  linkage rather than just dynamic.
  
  Fixes #25947
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_Make
  -------------------------
  

• 5455f2b9
  by Matthew Pickering at 2025-04-12T08:31:36-04:00

  driver: Add support for "Fixed" nodes in the ModuleGraph
  
  A fixed node in the module graph is one which we presume is already
  built. It's therefore up to the user to make sure that the interface
  file and any relevant artifacts are available for a fixed node.
  
  Fixed/Compile nodes are represented by the ModuleNodeInfo type, which
  abstracts the common parts of Fixed/Compile nodes with accessor
  functions of type `ModuleNodeInfo -> ...`.
  
  Fixed nodes can only depend on other fixed nodes. This invariant can be
  checked by the function `checkModuleGraph` or `mkModuleGraphChecked`.
  
  --make mode is modified to work with fixed mode. In order to "compile" a
  fixed node, the artifacts are just loaded into the HomePackageTable.
  Currently nothing in the compiler will produce Fixed nodes but this is
  tested with the FixedNodes GHC API test.
  
  In subsequent patches we are going to remove the ExternalModuleGraph and
  use Fixed nodes for modules in the module graph in oneshot mode.
  
  Fixes #25920
  

• ad64d5c2
  by Cheng Shao at 2025-04-12T08:32:19-04:00

  ci: remove manual case of ghc-wasm-meta downstream testing jobs
  
  This patch removes the manual case of ghc-wasm-meta downstream testing
  jobs; now the only way of including them in the pipeline and running
  them is via the test-wasm label.
  
  The reason of the removal is it proves to be problematic for MRs with
  only the wasm label; the wasm job would succeed, then the pipeline
  status would be waiting for manual action instead of succeeding. There
  needs to be separate jobs for the label-triggered and manual-triggered
  cases, but I don't think it's worth that extra complexity, the
  label-triggered case is already sufficient.
  

• b34890c7
  by Vladislav Zavialov at 2025-04-13T01:08:21+03:00

  Fix EmptyCase panic in tcMatches (#25960)
  
  Due to faulty reasoning in Note [Pattern types for EmptyCase],
  tcMatches was too keen to panic.
  
  * Old (incorrect) assumption: pat_tys is a singleton list.
    This does not hold when \case{} is checked against a function type
    preceded by invisible forall. See the new T25960 test case.
  
  * New (hopefully correct) assumption: vis_pat_tys is a singleton list.
    This should follow from:
  
      checkArgCounts :: MatchGroup GhcRn ... -> TcM VisArity
      checkArgCounts (MG { mg_alts = L _ [] })
        = return 1
      ...
  

• 84806ebc
  by Vladislav Zavialov at 2025-04-13T11:40:08-04:00

  Remove unused type: TokenLocation
  

• 05eb50df
  by Vladislav Zavialov at 2025-04-13T19:16:38-04:00

  Register EpToken in Parser.PostProcess.Haddock (#22558)
  
  This change allows us to reject more badly placed Haddock comments.
  Examples:
  
    module
      -- | Bad comment for the module
      T17544_kw where
  
    data Foo -- | Bad comment for MkFoo
      where MkFoo :: Foo
  
    newtype Bar -- | Bad comment for MkBar
      where MkBar :: () -> Bar
  
    class Cls a
        -- | Bad comment for clsmethod
      where
        clsmethod :: a
  

• 01944e5e
  by Vladislav Zavialov at 2025-04-13T19:17:21-04:00

  Reject puns in T2T (#24153)
  
  This patch implements pun detection in T2T. Consider:
  
    x = 42
    f, g :: forall a -> ...
    f (type x) = g x
  
  In accordance with the specification, the `g x` function call is renamed
  as a term, so `x` refers to the top-level binding `x = 42`, not to the
  type variable binding `type x` as one might expect.
  
  This is somewhat counterintuitive because `g` expects a type argument.
  Forbidding puns in T2T allows us to produce a helpful error message:
  
    Test.hs:5:16: error: [GHC-09591]
      Illegal punned variable occurrence in a required type argument.
      The name ‘x’ could refer to:
        ‘x’ defined at Test.hs:3:1
        ‘x’ bound at Test.hs:5:9
  
  This commit is a follow up to 0dfb1fa799af254c8a1e1045fc3996af2d57a613
  where checking for puns was left as future work.
  

• cc580552
  by Vladislav Zavialov at 2025-04-13T19:18:02-04:00

  Additional test cases for #12088, #13790
  
  Extract more test cases from ticket discussions, including multi-module
  examples. Follow up to 5712e0d646f611dfbfedfd7ef6dff3a18c016edb
  

• d47bf776
  by Matthew Pickering at 2025-04-14T16:44:41+01:00

  driver: Use ModuleGraph for oneshot and --make mode
  
  This patch uses the `hsc_mod_graph` field for both oneshot and --make
  mode. Therefore, if part of the compiler requires usage of the module
  graph, you do so in a uniform way for the two different modes.
  
  The `ModuleGraph` describes the relationship between the modules in the
  home package and units in external packages. The `ModuleGraph` can be
  queried when information about the transitive closure of a package is
  needed. For example, the primary use of the ModuleGraph from within the
  compiler is in the loader, which needs to know the transitive closure of
  a module so it can load all the relevant objects for evaluation.
  
  In --make mode, downsweep computes the ModuleGraph before any
  compilation starts.
  
  In oneshot mode, a thunk is created at the start of compilation, which
  when forced will compute the module graph beneath the current module.
  The thunk is only forced at the moment when the user uses Template
  Haskell.
  
  Finally, there are some situations where we need to discover what
  dependencies to load but haven't loaded a module graph at all. In this
  case, there is a fallback which computes the transitive closure on the
  fly and doesn't cache the result. Presumably if you are going to call
  getLinkDeps a lot, you would compute the right ModuleGraph before you
  started.
  
  Importantly, this removes the ExternalModuleGraph abstraction. This was quite
  awkward to work with since it stored information about the home package
  inside the EPS.
  
  This patch will also be very useful when implementing explicit level
  imports, which requires more significant use of the module graph in
  order to determine which level instances are available at.
  
  Towards #25795
  
  -------------------------
  Metric Decrease:
      MultiLayerModulesTH_Make
      MultiLayerModulesTH_OneShot
  -------------------------
  

• 395e0ad1
  by sheaf at 2025-04-16T12:33:26-04:00

  base: remove .Internal modules (e.g. GHC.TypeLits)
  
  This commit removes the following internal modules from base,
  as per CLC proposal 217:
  
    - GHC.TypeNats.Internal
    - GHC.TypeLits.Internal
    - GHC.ExecutionStack.Internal
  
  Fixes #25007
  

• e0f3ff11
  by Patrick at 2025-04-17T04:31:12-04:00

  Refactor Handling of Multiple Default Declarations
  
  Fixes: #25912, #25914, #25934
  
  Previously, GHC discarded all loaded defaults (tcg_default) when local
  defaults were encountered during typechecking. According to the
  exportable-named-default proposal (sections 2.4.2 and 2.4.3), local
  defaults should be merged into tcg_default, retaining any defaults
  already present while overriding where necessary.
  
  Key Changes:
  
  * Introduce DefaultProvenance to track the origin of default declarations
    (local, imported, or built-in), replacing the original cd_module
    in ClassDefaults with cd_provenance :: DefaultProvenance.
  * Rename tcDefaults to tcDefaultDecls, limiting its responsibility to only
    converting renamed class defaults into ClassDefaults.
  * Add extendDefaultEnvWithLocalDefaults to merge local defaults into the
    environment, with proper duplication checks:
    - Duplicate local defaults for a class trigger an error.
    - Local defaults override imported or built-in defaults.
  * Update and add related notes: Note [Builtin class defaults],
    Note [DefaultProvenance].
  * Add regression tests: T25912, T25914, T25934.
  
  Thanks sam and simon for the help on this patch.
  Co-authored-by: sheaf <sam.derbyshire@gmail.com>
  

• 386f1854
  by Teo Camarasu at 2025-04-17T04:31:55-04:00

  template-haskell: Remove `addrToByteArrayName` and `addrToByteArray`
  
  These were part of the implementation of the `Lift ByteArray` instance and were errornously exported because this module lacked an explicit export list. They have no usages on Hackage.
  
  Resolves #24782
  

• b96e2f77
  by Sylvain Henry at 2025-04-18T20:46:33-04:00

  RTS: remove target info and fix host info (#24058)
  
  The RTS isn't a compiler, hence it doesn't have a target and we remove
  the reported target info displayed by "+RTS --info". We also fix the
  host info displayed by "+RTS --info": the host of the RTS is the
  RTS-building compiler's target, not the compiler's host (wrong when
  doing cross-compilation).
  

• 6d9965f4
  by Sylvain Henry at 2025-04-18T20:46:33-04:00

  RTS: remove build info
  
  As per the discussion in !13967, there is no reason to tag the RTS with
  information about the build platform.
  

• d52e9b3f
  by Vladislav Zavialov at 2025-04-18T20:47:15-04:00

  Diagnostics: remove the KindMismatch constructor (#25957)
  
  The KindMismatch constructor was only used as an intermediate
  representation in pretty-printing.
  
  Its removal addresses a problem detected by the "codes" test case:
  
    [GHC-89223] is untested (constructor = KindMismatch)
  
  In a concious deviation from the usual procedure, the error code
  GHC-89223 is removed entirely rather than marked as Outdated.
  The reason is that it never was user-facing in the first place.
  

• e2f2f9d0
  by Vladislav Zavialov at 2025-04-20T10:53:39-04:00

  Add name for -Wunusable-unpack-pragmas
  
  This warning had no name or flag and was triggered unconditionally.
  Now it is part of -Wdefault.
  
  In GHC.Tc.TyCl.tcTyClGroupsPass's strict mode, we now have to
  force-enable this warning to ensure that detection of flawed groups
  continues to work even if the user disables the warning with the
  -Wno-unusable-unpack-pragmas option. Test case: T3990c
  
  Also, the misnamed BackpackUnpackAbstractType is now called
  UnusableUnpackPragma.
  

• 6caa6508
  by Adam Gundry at 2025-04-20T10:54:22-04:00

  Fix specialisation of incoherent instances (fixes #25883)
  
  GHC normally assumes that class constraints are canonical, meaning that
  the specialiser is allowed to replace one dictionary argument with another
  provided that they have the same type.  The `-fno-specialise-incoherents`
  flag alters INCOHERENT instance definitions so that they will prevent
  specialisation in some cases, by inserting `nospec`.
  
  This commit fixes a bug in 7124e4ad76d98f1fc246ada4fd7bf64413ff2f2e, which
  treated some INCOHERENT instance matches as if `-fno-specialise-incoherents`
  was in effect, thereby unnecessarily preventing specialisation. In addition
  it updates the relevant `Note [Rules for instance lookup]` and adds a new
  `Note [Canonicity for incoherent matches]`.
  

• 0426fd6c
  by Adam Gundry at 2025-04-20T10:54:23-04:00

  Add regression test for #23429
  

• eec96527
  by Adam Gundry at 2025-04-20T10:54:23-04:00

  user's guide: update specification of overlapping/incoherent instances
  
  The description of the instance resolution algorithm in the user's
  guide was slightly out of date, because it mentioned in-scope given
  constraints only at the end, whereas the implementation checks for
  their presence before any of the other steps.
  
  This also adds a warning to the user's guide about the impact of
  incoherent instances on specialisation, and more clearly documents
  some of the other effects of `-XIncoherentInstances`.
  

• a00eeaec
  by Matthew Craven at 2025-04-20T10:55:03-04:00

  Fix bytecode generation for `tagToEnum# <LITERAL>`
  
  Fixes #25975.
  

• 2e204269
  by Andreas Klebinger at 2025-04-22T12:20:41+02:00

  Simplifier: Constant fold invald tagToEnum# calls to bottom expr.
  
  When applying tagToEnum# to a out-of-range value it's best to simply
  constant fold it to a bottom expression. That potentially allows more
  dead code elimination and makes debugging easier.
  
  Fixes #25976
  

• 7250fc0c
  by Matthew Pickering at 2025-04-22T16:24:04-04:00

  Move -fno-code note into Downsweep module
  
  This note was left behind when all the code which referred to it was
  moved into the GHC.Driver.Downsweep module
  

• d2dc89b4
  by Matthew Pickering at 2025-04-22T16:24:04-04:00

  Apply editing notes to Note [-fno-code mode] suggested by sheaf
  
  These notes were suggested in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14241
  

• 07575d15
  by Ben Gamari at 2025-04-23T15:10:22+05:30

  SetLevels: Make Level strict
  
  There is no benefit to collecting thunks for (+1) operations.
  

• 903d8369
  by Ben Gamari at 2025-04-23T15:13:53+05:30

  SetLevels: Track binding context
  
  In preparation to use this information to provide more context-sensitive
  naming for generated `lvl_` identifiers as propsed in #25802.
  

• 7cf39c79
  by Ben Gamari at 2025-04-23T15:14:33+05:30

  SetLevels: Name `lvl` binders according to context
  
  In general we should strive to maintain some amount of information about
  the provenance of generated bindings.
  
  Addresses #25802.
  

960 changed files:

• .gitlab-ci.yml
• .gitlab/generate-ci/gen_ci.hs
• .gitlab/jobs.yaml
• .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
• .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
• .gitlab/rel_eng/upload.sh
• .gitlab/rel_eng/upload_ghc_libs.py
• compiler/GHC.hs
• compiler/GHC/Builtin/Names/TH.hs
• compiler/GHC/Builtin/PrimOps/Ids.hs
• compiler/GHC/Builtin/Types.hs
• compiler/GHC/Builtin/primops.txt.pp
• compiler/GHC/ByteCode/Asm.hs
• compiler/GHC/ByteCode/Instr.hs
• compiler/GHC/ByteCode/Types.hs
• compiler/GHC/Cmm/CallConv.hs
• compiler/GHC/Cmm/Dataflow/Label.hs
• compiler/GHC/Cmm/Lint.hs
• compiler/GHC/Cmm/Liveness.hs
• compiler/GHC/Cmm/MachOp.hs
• compiler/GHC/Cmm/Opt.hs
• compiler/GHC/Cmm/Parser.y
• compiler/GHC/Cmm/ThreadSanitizer.hs
• compiler/GHC/Cmm/Type.hs
• compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
• compiler/GHC/CmmToAsm/Config.hs
• compiler/GHC/CmmToAsm/PPC/CodeGen.hs
• compiler/GHC/CmmToAsm/RV64/CodeGen.hs
• compiler/GHC/CmmToAsm/Reg/Linear/Base.hs
• compiler/GHC/CmmToAsm/X86/CodeGen.hs
• compiler/GHC/CmmToAsm/X86/Instr.hs
• compiler/GHC/CmmToAsm/X86/Ppr.hs
• compiler/GHC/CmmToAsm/X86/RegInfo.hs
• compiler/GHC/CmmToC.hs
• compiler/GHC/CmmToLlvm/Base.hs
• compiler/GHC/CmmToLlvm/CodeGen.hs
• compiler/GHC/Core.hs
• compiler/GHC/Core/Coercion/Axiom.hs
• compiler/GHC/Core/Coercion/Opt.hs
• compiler/GHC/Core/DataCon.hs
• compiler/GHC/Core/FamInstEnv.hs
• compiler/GHC/Core/InstEnv.hs
• compiler/GHC/Core/LateCC/TopLevelBinds.hs
• compiler/GHC/Core/Lint.hs
• compiler/GHC/Core/Make.hs
• compiler/GHC/Core/Map/Expr.hs
• compiler/GHC/Core/Map/Type.hs
• compiler/GHC/Core/Opt/CSE.hs
• compiler/GHC/Core/Opt/CallerCC/Types.hs
• compiler/GHC/Core/Opt/ConstantFold.hs
• compiler/GHC/Core/Opt/SetLevels.hs
• compiler/GHC/Core/Opt/Simplify/Env.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Opt/SpecConstr.hs
• compiler/GHC/Core/Opt/Specialise.hs
• compiler/GHC/Core/Opt/WorkWrap/Utils.hs
• compiler/GHC/Core/Predicate.hs
• compiler/GHC/Core/Rules.hs
• compiler/GHC/Core/Rules/Config.hs
• compiler/GHC/Core/SimpleOpt.hs
• compiler/GHC/Core/Subst.hs
• compiler/GHC/Core/Tidy.hs
• compiler/GHC/Core/TyCo/Compare.hs
• compiler/GHC/Core/TyCo/FVs.hs
• compiler/GHC/Core/TyCo/Ppr.hs
• compiler/GHC/Core/TyCo/Rep.hs
• compiler/GHC/Core/TyCo/Subst.hs
• compiler/GHC/Core/TyCo/Tidy.hs
• compiler/GHC/Core/TyCon.hs
• compiler/GHC/Core/Type.hs
• compiler/GHC/Core/Type.hs-boot
• compiler/GHC/Core/Unify.hs
• compiler/GHC/CoreToIface.hs
• compiler/GHC/CoreToStg.hs
• compiler/GHC/CoreToStg/Prep.hs
• compiler/GHC/Data/BooleanFormula.hs
• compiler/GHC/Data/FlatBag.hs
• compiler/GHC/Data/Graph/Color.hs
• compiler/GHC/Data/Maybe.hs
• compiler/GHC/Data/SmallArray.hs
• compiler/GHC/Data/Strict.hs
• compiler/GHC/Data/TrieMap.hs
• compiler/GHC/Driver/Backpack.hs
• compiler/GHC/Driver/Config.hs
• compiler/GHC/Driver/Config/CmmToAsm.hs
• compiler/GHC/Driver/Config/StgToCmm.hs
• + compiler/GHC/Driver/Downsweep.hs
• compiler/GHC/Driver/DynFlags.hs
• compiler/GHC/Driver/Env.hs
• compiler/GHC/Driver/Env/Types.hs
• compiler/GHC/Driver/Errors/Ppr.hs
• compiler/GHC/Driver/Errors/Types.hs
• compiler/GHC/Driver/Flags.hs
• + compiler/GHC/Driver/IncludeSpecs.hs
• compiler/GHC/Driver/Main.hs
• compiler/GHC/Driver/Make.hs
• + compiler/GHC/Driver/MakeAction.hs
• compiler/GHC/Driver/MakeFile.hs
• + compiler/GHC/Driver/Messager.hs
• compiler/GHC/Driver/Pipeline.hs-boot
• compiler/GHC/Driver/Pipeline/Execute.hs
• compiler/GHC/Driver/Session.hs
• + compiler/GHC/Driver/Session/Units.hs
• compiler/GHC/Hs/Binds.hs
• compiler/GHC/Hs/Decls.hs
• compiler/GHC/Hs/Expr.hs
• compiler/GHC/Hs/Extension.hs
• compiler/GHC/Hs/ImpExp.hs
• compiler/GHC/Hs/Instances.hs
• compiler/GHC/Hs/Pat.hs
• compiler/GHC/Hs/Specificity.hs
• compiler/GHC/Hs/Stats.hs
• compiler/GHC/Hs/Syn/Type.hs
• compiler/GHC/Hs/Type.hs
• compiler/GHC/Hs/Utils.hs
• compiler/GHC/HsToCore.hs
• compiler/GHC/HsToCore/Binds.hs
• compiler/GHC/HsToCore/Docs.hs
• compiler/GHC/HsToCore/Errors/Ppr.hs
• compiler/GHC/HsToCore/Errors/Types.hs
• compiler/GHC/HsToCore/Expr.hs
• compiler/GHC/HsToCore/Foreign/C.hs
• compiler/GHC/HsToCore/Foreign/Call.hs
• compiler/GHC/HsToCore/Foreign/Wasm.hs
• compiler/GHC/HsToCore/Match.hs
• compiler/GHC/HsToCore/Match/Constructor.hs
• compiler/GHC/HsToCore/Monad.hs
• compiler/GHC/HsToCore/Pmc/Desugar.hs
• compiler/GHC/HsToCore/Quote.hs
• compiler/GHC/HsToCore/Ticks.hs
• compiler/GHC/HsToCore/Types.hs
• compiler/GHC/HsToCore/Usage.hs
• compiler/GHC/Iface/Binary.hs
• compiler/GHC/Iface/Decl.hs
• compiler/GHC/Iface/Env.hs
• compiler/GHC/Iface/Ext/Ast.hs
• + compiler/GHC/Iface/Flags.hs
• compiler/GHC/Iface/Load.hs
• compiler/GHC/Iface/Make.hs
• compiler/GHC/Iface/Recomp.hs
• compiler/GHC/Iface/Recomp/Binary.hs
• compiler/GHC/Iface/Recomp/Flags.hs
• + compiler/GHC/Iface/Recomp/Types.hs
• compiler/GHC/Iface/Rename.hs
• compiler/GHC/Iface/Syntax.hs
• compiler/GHC/Iface/Tidy.hs
• compiler/GHC/Iface/Type.hs
• compiler/GHC/IfaceToCore.hs
• compiler/GHC/IfaceToCore.hs-boot
• compiler/GHC/JS/Opt/Expr.hs
• compiler/GHC/JS/Opt/Simple.hs
• compiler/GHC/Linker/Deps.hs
• compiler/GHC/Linker/Loader.hs
• compiler/GHC/Parser.y
• compiler/GHC/Parser/Annotation.hs
• compiler/GHC/Parser/Errors/Ppr.hs
• compiler/GHC/Parser/Errors/Types.hs
• compiler/GHC/Parser/PostProcess.hs
• compiler/GHC/Parser/PostProcess/Haddock.hs
• compiler/GHC/Parser/String.hs
• compiler/GHC/Platform.hs
• compiler/GHC/Platform/LoongArch64.hs
• compiler/GHC/Plugins.hs
• compiler/GHC/Rename/Bind.hs
• compiler/GHC/Rename/Env.hs
• compiler/GHC/Rename/Expr.hs
• compiler/GHC/Rename/Fixity.hs
• compiler/GHC/Rename/HsType.hs
• compiler/GHC/Rename/Module.hs
• compiler/GHC/Rename/Names.hs
• compiler/GHC/Rename/Pat.hs
• compiler/GHC/Rename/Splice.hs
• compiler/GHC/Rename/Unbound.hs
• compiler/GHC/Rename/Utils.hs
• compiler/GHC/Runtime/Debugger.hs
• + compiler/GHC/Runtime/Debugger/Breakpoints.hs
• compiler/GHC/Runtime/Eval.hs
• compiler/GHC/Runtime/Eval/Types.hs
• + compiler/GHC/Runtime/Eval/Utils.hs
• compiler/GHC/Runtime/Heap/Inspect.hs
• compiler/GHC/Runtime/Interpreter.hs
• compiler/GHC/Runtime/Interpreter/JS.hs
• compiler/GHC/Runtime/Interpreter/Types.hs
• compiler/GHC/Runtime/Interpreter/Wasm.hs
• compiler/GHC/Runtime/Loader.hs
• compiler/GHC/Settings/IO.hs
• compiler/GHC/Stg/CSE.hs
• compiler/GHC/Stg/Unarise.hs
• compiler/GHC/StgToByteCode.hs
• compiler/GHC/StgToCmm/Config.hs
• compiler/GHC/StgToCmm/Prim.hs
• compiler/GHC/StgToCmm/TagCheck.hs
• compiler/GHC/SysTools/Cpp.hs
• compiler/GHC/SysTools/Process.hs
• compiler/GHC/Tc/Deriv.hs
• compiler/GHC/Tc/Deriv/Generate.hs
• compiler/GHC/Tc/Deriv/Generics.hs
• compiler/GHC/Tc/Errors.hs
• compiler/GHC/Tc/Errors/Hole/FitTypes.hs
• compiler/GHC/Tc/Errors/Hole/Plugin.hs
• compiler/GHC/Tc/Errors/Ppr.hs
• compiler/GHC/Tc/Errors/Types.hs
• compiler/GHC/Tc/Gen/App.hs
• compiler/GHC/Tc/Gen/Arrow.hs
• compiler/GHC/Tc/Gen/Bind.hs
• compiler/GHC/Tc/Gen/Default.hs
• compiler/GHC/Tc/Gen/Export.hs
• compiler/GHC/Tc/Gen/Expr.hs
• compiler/GHC/Tc/Gen/Foreign.hs
• compiler/GHC/Tc/Gen/Head.hs
• compiler/GHC/Tc/Gen/HsType.hs
• compiler/GHC/Tc/Gen/Match.hs
• compiler/GHC/Tc/Gen/Pat.hs
• − compiler/GHC/Tc/Gen/Rule.hs
• compiler/GHC/Tc/Gen/Sig.hs
• compiler/GHC/Tc/Gen/Splice.hs
• compiler/GHC/Tc/Gen/Splice.hs-boot
• compiler/GHC/Tc/Instance/Family.hs
• compiler/GHC/Tc/Instance/FunDeps.hs
• compiler/GHC/Tc/Module.hs
• compiler/GHC/Tc/Plugin.hs
• compiler/GHC/Tc/Solver.hs
• compiler/GHC/Tc/Solver/Default.hs
• compiler/GHC/Tc/Solver/Dict.hs
• compiler/GHC/Tc/Solver/Equality.hs
• compiler/GHC/Tc/Solver/InertSet.hs
• compiler/GHC/Tc/Solver/Irred.hs
• compiler/GHC/Tc/Solver/Monad.hs
• compiler/GHC/Tc/Solver/Rewrite.hs
• compiler/GHC/Tc/Solver/Solve.hs
• compiler/GHC/Tc/Solver/Types.hs
• compiler/GHC/Tc/TyCl.hs
• compiler/GHC/Tc/TyCl/Build.hs
• compiler/GHC/Tc/TyCl/Class.hs
• compiler/GHC/Tc/TyCl/Instance.hs
• compiler/GHC/Tc/TyCl/PatSyn.hs
• compiler/GHC/Tc/TyCl/Utils.hs
• compiler/GHC/Tc/Types.hs
• compiler/GHC/Tc/Types/Constraint.hs
• compiler/GHC/Tc/Types/ErrCtxt.hs
• compiler/GHC/Tc/Types/Evidence.hs
• compiler/GHC/Tc/Types/Origin.hs
• compiler/GHC/Tc/Types/TH.hs
• compiler/GHC/Tc/Types/TcRef.hs
• compiler/GHC/Tc/Utils/Backpack.hs
• compiler/GHC/Tc/Utils/Env.hs
• compiler/GHC/Tc/Utils/Instantiate.hs
• compiler/GHC/Tc/Utils/Monad.hs
• compiler/GHC/Tc/Utils/TcMType.hs
• compiler/GHC/Tc/Utils/TcType.hs
• compiler/GHC/Tc/Utils/Unify.hs
• compiler/GHC/Tc/Validity.hs
• compiler/GHC/Tc/Zonk/Env.hs
• compiler/GHC/Tc/Zonk/TcType.hs
• compiler/GHC/Tc/Zonk/Type.hs
• compiler/GHC/ThToHs.hs
• compiler/GHC/Types/Annotations.hs
• compiler/GHC/Types/Avail.hs
• compiler/GHC/Types/Basic.hs
• compiler/GHC/Types/Breakpoint.hs
• compiler/GHC/Types/CostCentre.hs
• compiler/GHC/Types/CostCentre/State.hs
• compiler/GHC/Types/DefaultEnv.hs
• compiler/GHC/Types/Error/Codes.hs
• compiler/GHC/Types/ForeignCall.hs
• compiler/GHC/Types/GREInfo.hs
• compiler/GHC/Types/Hint.hs
• compiler/GHC/Types/Hint/Ppr.hs
• compiler/GHC/Types/HpcInfo.hs
• compiler/GHC/Types/Id.hs
• compiler/GHC/Types/Id/Make.hs
• compiler/GHC/Types/Literal.hs
• compiler/GHC/Types/Name.hs
• compiler/GHC/Types/Name/Occurrence.hs
• compiler/GHC/Types/Name/Ppr.hs
• compiler/GHC/Types/Name/Reader.hs
• compiler/GHC/Types/PkgQual.hs
• compiler/GHC/Types/ProfAuto.hs
• compiler/GHC/Types/SafeHaskell.hs
• compiler/GHC/Types/SourceFile.hs
• compiler/GHC/Types/SptEntry.hs
• compiler/GHC/Types/SrcLoc.hs
• compiler/GHC/Types/TyThing/Ppr.hs
• compiler/GHC/Types/Unique/Supply.hs
• compiler/GHC/Types/Var.hs
• compiler/GHC/Types/Var/Env.hs
• compiler/GHC/Unit/External.hs
• compiler/GHC/Unit/Finder.hs
• compiler/GHC/Unit/Module/Deps.hs
• − compiler/GHC/Unit/Module/External/Graph.hs
• compiler/GHC/Unit/Module/Graph.hs
• compiler/GHC/Unit/Module/ModDetails.hs
• compiler/GHC/Unit/Module/ModGuts.hs
• compiler/GHC/Unit/Module/ModIface.hs
• compiler/GHC/Unit/Module/ModNodeKey.hs
• compiler/GHC/Unit/Types.hs
• compiler/GHC/Utils/Binary.hs
• compiler/GHC/Utils/Logger.hs
• compiler/GHC/Utils/Outputable.hs
• compiler/GHC/Utils/Panic.hs
• compiler/GHC/Utils/Unique.hs
• compiler/Language/Haskell/Syntax/Basic.hs
• compiler/Language/Haskell/Syntax/Binds.hs
• compiler/Language/Haskell/Syntax/Decls.hs
• compiler/Language/Haskell/Syntax/Expr.hs
• compiler/Language/Haskell/Syntax/Extension.hs
• compiler/Language/Haskell/Syntax/Pat.hs
• compiler/Language/Haskell/Syntax/Type.hs
• compiler/Language/Haskell/Syntax/Type.hs-boot
• compiler/ghc.cabal.in
• configure.ac
• docs/users_guide/9.14.1-notes.rst
• docs/users_guide/expected-undocumented-flags.txt
• docs/users_guide/exts/ffi.rst
• docs/users_guide/exts/instances.rst
• docs/users_guide/exts/linear_types.rst
• docs/users_guide/exts/monad_comprehensions.rst
• docs/users_guide/exts/named_defaults.rst
• docs/users_guide/exts/overloaded_strings.rst
• docs/users_guide/exts/parallel_list_comprehensions.rst
• docs/users_guide/exts/poly_kinds.rst
• docs/users_guide/exts/pragmas.rst
• + docs/users_guide/exts/type_defaulting.rst
• docs/users_guide/exts/types.rst
• docs/users_guide/ghci.rst
• docs/users_guide/phases.rst
• docs/users_guide/runtime_control.rst
• docs/users_guide/using-concurrent.rst
• docs/users_guide/using-optimisation.rst
• docs/users_guide/using-warnings.rst
• docs/users_guide/using.rst
• docs/users_guide/wasm.rst
• + ghc/GHC/Driver/Session/Lint.hs
• + ghc/GHC/Driver/Session/Mode.hs
• ghc/GHCi/UI.hs
• ghc/GHCi/UI/Monad.hs
• ghc/Main.hs
• ghc/ghc-bin.cabal.in
• hadrian/doc/flavours.md
• hadrian/src/CommandLine.hs
• hadrian/src/Flavour.hs
• hadrian/src/Flavour/Type.hs
• hadrian/src/Hadrian/Haskell/Hash.hs
• hadrian/src/Oracles/Flag.hs
• hadrian/src/Oracles/Setting.hs
• hadrian/src/Rules/Generate.hs
• hadrian/src/Rules/Test.hs
• hadrian/src/Settings.hs
• hadrian/src/Settings/Builders/Cabal.hs
• hadrian/src/Settings/Builders/RunTest.hs
• hadrian/src/Settings/Default.hs
• hadrian/src/Settings/Flavours/Release.hs
• hadrian/src/Settings/Packages.hs
• libraries/array
• libraries/base/base.cabal.in
• libraries/base/changelog.md
• − libraries/base/src/GHC/ExecutionStack/Internal.hs
• libraries/base/src/GHC/RTS/Flags.hs
• libraries/base/src/GHC/Records.hs
• libraries/base/src/GHC/Stats.hs
• − libraries/base/src/GHC/TypeLits/Internal.hs
• − libraries/base/src/GHC/TypeNats/Internal.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Lib.hs
• libraries/ghc-boot-th/GHC/Internal/TH/Lib/Map.hs → libraries/ghc-boot-th/GHC/Boot/TH/Lib/Map.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Lift.hs
• libraries/ghc-boot-th/GHC/Internal/TH/Ppr.hs → libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs
• libraries/ghc-boot-th/GHC/Internal/TH/PprLib.hs → libraries/ghc-boot-th/GHC/Boot/TH/PprLib.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Quote.hs
• + libraries/ghc-boot-th/GHC/Boot/TH/Syntax.hs
• libraries/ghc-boot-th/ghc-boot-th.cabal.in
• libraries/ghc-boot/GHC/Serialized.hs
• libraries/ghc-experimental/src/GHC/Wasm/Prim.hs
• + libraries/ghc-internal/cbits/int64x2minmax.c
• + libraries/ghc-internal/cbits/vectorQuotRem.c
• libraries/ghc-internal/ghc-internal.cabal.in
• libraries/ghc-internal/src/GHC/Internal/Float.hs
• libraries/ghc-internal/src/GHC/Internal/Numeric.hs
• libraries/ghc-internal/src/GHC/Internal/Pack.hs
• libraries/ghc-internal/src/GHC/Internal/Real.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Lib.hs
• libraries/ghc-internal/src/GHC/Internal/TH/Syntax.hs
• libraries/ghc-internal/src/GHC/Internal/TypeError.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Exports.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Flag.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Imports.hs
• libraries/ghc-internal/src/GHC/Internal/Wasm/Prim/Types.hs
• libraries/ghci/GHCi/Message.hs
• libraries/ghci/GHCi/ResolvedBCO.hs
• libraries/ghci/GHCi/Server.hs
• libraries/ghci/GHCi/Signals.hs
• libraries/ghci/GHCi/TH.hs
• libraries/ghci/GHCi/TH/Binary.hs
• libraries/template-haskell/Language/Haskell/TH/Lib.hs
• − libraries/template-haskell/Language/Haskell/TH/Lib/Internal.hs
• libraries/template-haskell/Language/Haskell/TH/Ppr.hs
• libraries/template-haskell/Language/Haskell/TH/PprLib.hs
• libraries/template-haskell/Language/Haskell/TH/Quote.hs
• libraries/template-haskell/Language/Haskell/TH/Syntax.hs
• libraries/template-haskell/changelog.md
• libraries/template-haskell/template-haskell.cabal.in
• m4/fp_settings.m4
• m4/fptools_set_c_ld_flags.m4
• nofib
• rts/HeapStackCheck.cmm
• rts/IOManager.c
• rts/Interpreter.c
• rts/PrimOps.cmm
• rts/RtsAPI.c
• rts/RtsSymbols.c
• rts/RtsUtils.c
• rts/include/HsFFI.h
• rts/include/RtsAPI.h
• rts/linker/MachO.c
• rts/linker/MachOTypes.h
• rts/wasm/JSFFI.c
• rts/wasm/blocker.cmm
• rts/wasm/jsval.cmm
• rts/wasm/scheduler.cmm
• testsuite/config/ghc
• testsuite/driver/junit.py
• testsuite/driver/perf_notes.py
• testsuite/driver/testlib.py
• testsuite/ghc-config/ghc-config.hs
• testsuite/mk/boilerplate.mk
• testsuite/tests/backpack/should_fail/bkpfail51.stderr
• + testsuite/tests/bytecode/T25975.hs
• + testsuite/tests/bytecode/T25975.stdout
• testsuite/tests/bytecode/all.T
• + testsuite/tests/cmm/opt/T25771.cmm
• + testsuite/tests/cmm/opt/T25771.stderr
• testsuite/tests/cmm/opt/all.T
• testsuite/tests/cmm/should_run/AtomicFetch_cmm.cmm
• testsuite/tests/codeGen/should_compile/T25177.stderr
• testsuite/tests/codeGen/should_run/all.T
• + testsuite/tests/core-to-stg/T23865.hs
• testsuite/tests/core-to-stg/all.T
• testsuite/tests/count-deps/CountDepsAst.stdout
• testsuite/tests/count-deps/CountDepsParser.stdout
• + testsuite/tests/deSugar/should_compile/T10251.stderr
• + testsuite/tests/default/T25775.hs
• + testsuite/tests/default/T25775.stderr
• + testsuite/tests/default/T25857.hs
• + testsuite/tests/default/T25857.stderr
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• + testsuite/tests/simplCore/should_compile/DsSpecPragmas.stderr
• testsuite/tests/simplCore/should_compile/Makefile
• testsuite/tests/simplCore/should_compile/RewriteHigherOrderPatterns.stderr
• testsuite/tests/simplCore/should_compile/T12603.stdout
• testsuite/tests/simplCore/should_compile/T15445.stderr
• testsuite/tests/simplCore/should_compile/T18013.stderr
• testsuite/tests/simplCore/should_compile/T18668.stderr
• testsuite/tests/simplCore/should_compile/T23307c.stderr
• + testsuite/tests/simplCore/should_compile/T24359a.hs
• + testsuite/tests/simplCore/should_compile/T24359a.stderr
• + testsuite/tests/simplCore/should_compile/T25389.hs
• + testsuite/tests/simplCore/should_compile/T25389.stderr
• + testsuite/tests/simplCore/should_compile/T25883.hs
• + testsuite/tests/simplCore/should_compile/T25883.substr-simpl
• + testsuite/tests/simplCore/should_compile/T25883b.hs
• + testsuite/tests/simplCore/should_compile/T25883b.substr-simpl
• + testsuite/tests/simplCore/should_compile/T25883c.hs
• + testsuite/tests/simplCore/should_compile/T25883c.substr-simpl
• + testsuite/tests/simplCore/should_compile/T25883d.hs
• + testsuite/tests/simplCore/should_compile/T25883d.stderr
• + testsuite/tests/simplCore/should_compile/T25883d_import.hs
• + testsuite/tests/simplCore/should_compile/T25976.hs
• + testsuite/tests/simplCore/should_compile/T3990b.hs
• + testsuite/tests/simplCore/should_compile/T3990b.stdout
• + testsuite/tests/simplCore/should_compile/T3990c.hs
• + testsuite/tests/simplCore/should_compile/T3990c.stdout
• testsuite/tests/simplCore/should_compile/T4398.stderr
• testsuite/tests/simplCore/should_compile/T5821.hs
• testsuite/tests/simplCore/should_compile/T8537.stderr
• + testsuite/tests/simplCore/should_compile/T9578b.hs
• testsuite/tests/simplCore/should_compile/all.T
• − testsuite/tests/simplCore/should_compile/simpl016.stderr
• + testsuite/tests/simplCore/should_fail/T25117a.hs
• + testsuite/tests/simplCore/should_fail/T25117a.stderr
• + testsuite/tests/simplCore/should_fail/T25117b.hs
• + testsuite/tests/simplCore/should_fail/T25117b.stderr
• + testsuite/tests/simplCore/should_fail/T25672.hs
• + testsuite/tests/simplCore/should_fail/T25672.stderr
• testsuite/tests/simplCore/should_fail/all.T
• + testsuite/tests/simplCore/should_run/T23429.hs
• + testsuite/tests/simplCore/should_run/T23429.stdout
• + testsuite/tests/simplCore/should_run/T24359b.hs
• + testsuite/tests/simplCore/should_run/T24359b.stdout
• testsuite/tests/simplCore/should_run/all.T
• + testsuite/tests/th/T13123.stderr
• testsuite/tests/th/T15365.stderr
• testsuite/tests/th/T1835.stdout
• testsuite/tests/th/T19363.stdout
• testsuite/tests/th/T7064.stdout
• testsuite/tests/th/TH_pragma.hs
• testsuite/tests/th/TH_pragma.stderr
• testsuite/tests/typecheck/should_compile/InstanceGivenOverlap.hs
• testsuite/tests/typecheck/should_compile/LoopOfTheDay1.hs
• testsuite/tests/typecheck/should_compile/LoopOfTheDay2.hs
• testsuite/tests/typecheck/should_compile/LoopOfTheDay3.hs
• + testsuite/tests/typecheck/should_compile/RuleEqs.hs
• + testsuite/tests/typecheck/should_compile/RuleEqs.stderr
• testsuite/tests/typecheck/should_compile/T10504.stderr
• + testsuite/tests/typecheck/should_compile/T21003.hs
• testsuite/tests/typecheck/should_compile/T2494.stderr
• + testsuite/tests/typecheck/should_compile/T25960.hs
• testsuite/tests/typecheck/should_compile/T7050.stderr
• + testsuite/tests/typecheck/should_compile/TcSpecPragmas.hs
• + testsuite/tests/typecheck/should_compile/TcSpecPragmas.stderr
• testsuite/tests/typecheck/should_compile/all.T
• testsuite/tests/typecheck/should_compile/tc186.hs
• testsuite/tests/typecheck/should_compile/tc212.hs
• testsuite/tests/typecheck/should_fail/ExplicitSpecificity5.stderr
• testsuite/tests/typecheck/should_fail/ExplicitSpecificity6.stderr
• + testsuite/tests/typecheck/should_fail/SpecPragmasFail.hs
• + testsuite/tests/typecheck/should_fail/SpecPragmasFail.stderr
• testsuite/tests/typecheck/should_fail/T10495.hs
• testsuite/tests/typecheck/should_fail/T10495.stderr
• testsuite/tests/typecheck/should_fail/T12729.stderr
• testsuite/tests/typecheck/should_fail/T12921.stderr
• testsuite/tests/typecheck/should_fail/T16394.stderr
• testsuite/tests/typecheck/should_fail/T19109.stderr
• testsuite/tests/typecheck/should_fail/T19978.stderr
• testsuite/tests/typecheck/should_fail/T23776.stderr
• + testsuite/tests/typecheck/should_fail/T24090a.hs
• + testsuite/tests/typecheck/should_fail/T24090a.stderr
• + testsuite/tests/typecheck/should_fail/T24090b.hs
• testsuite/tests/wcompat-warnings/WCompatWarningsOn.stderr → testsuite/tests/typecheck/should_fail/T24090b.stderr
• + testsuite/tests/typecheck/should_fail/T25004.hs
• + testsuite/tests/typecheck/should_fail/T25004.stderr
• + testsuite/tests/typecheck/should_fail/T25004k.hs
• + testsuite/tests/typecheck/should_fail/T25004k.stderr
• testsuite/tests/typecheck/should_fail/T3966.stderr
• + testsuite/tests/typecheck/should_fail/T3966b.hs
• + testsuite/tests/typecheck/should_fail/T3966b.stderr
• testsuite/tests/typecheck/should_fail/T5853.stderr
• testsuite/tests/typecheck/should_fail/T6018fail.stderr
• testsuite/tests/typecheck/should_fail/T7210.stderr
• testsuite/tests/typecheck/should_fail/TyAppPat_MisplacedApplication.hs
• testsuite/tests/typecheck/should_fail/TyAppPat_MisplacedApplication.stderr
• testsuite/tests/typecheck/should_fail/all.T
• + testsuite/tests/typecheck/should_run/T25529.hs
• + testsuite/tests/typecheck/should_run/T25529.stdout
• testsuite/tests/typecheck/should_run/all.T
• testsuite/tests/unboxedsums/unpack_sums_5.stderr
• + testsuite/tests/vdq-rta/should_fail/T23738_fail_pun.hs
• + testsuite/tests/vdq-rta/should_fail/T23738_fail_pun.stderr
• testsuite/tests/vdq-rta/should_fail/all.T
• + testsuite/tests/warnings/should_compile/SpecMultipleTys.hs
• + testsuite/tests/warnings/should_compile/SpecMultipleTys.stderr
• testsuite/tests/warnings/should_compile/T19296.stderr
• testsuite/tests/warnings/should_compile/WarnNoncanonical.stderr
• testsuite/tests/warnings/should_compile/all.T
• + testsuite/tests/warnings/should_fail/SpecEMultipleTys.hs
• + testsuite/tests/warnings/should_fail/SpecEMultipleTys.stderr
• testsuite/tests/warnings/should_fail/all.T
• testsuite/tests/wasm/should_run/control-flow/README.md
• − testsuite/tests/wasm/should_run/control-flow/WasmControlFlow.stdout
• testsuite/tests/wasm/should_run/control-flow/all.T
• testsuite/tests/wcompat-warnings/Template.hs
• utils/check-exact/ExactPrint.hs
• utils/check-exact/Main.hs
• utils/check-exact/Parsers.hs
• utils/check-exact/Transform.hs
• utils/check-exact/Utils.hs
• utils/dump-decls/Main.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
• utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
• utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
• utils/haddock/haddock-api/src/Haddock/Convert.hs
• utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
• utils/haddock/haddock-api/src/Haddock/Interface.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
• utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
• utils/haddock/haddock-api/src/Haddock/Interface/RenameType.hs
• utils/haddock/haddock-api/src/Haddock/Types.hs
• utils/haddock/html-test/ref/LinearTypes.html
• utils/haddock/html-test/src/LinearTypes.hs
• utils/haddock/latex-test/ref/LinearTypes/LinearTypes.tex
• utils/haddock/latex-test/src/LinearTypes/LinearTypes.hs
• utils/jsffi/dyld.mjs
• utils/jsffi/post-link.mjs
• utils/jsffi/prelude.mjs

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