[Git][ghc/ghc][wip/jeltsch/stability-risk-1-and-2-module-deprecation] 200 commits: ci: remove duplicate keys in .gitlab-ci.yml

23 Mar 2026

      Wolfgang Jeltsch pushed to branch wip/jeltsch/stability-risk-1-and-2-module-deprecation at Glasgow Haskell Compiler / GHC

Commits:
414b9593 by Cheng Shao at 2026-01-24T07:11:51-05:00
ci: remove duplicate keys in .gitlab-ci.yml

This patch removes accidentally duplicate keys in `.gitlab-ci.yml`.
The YAML spec doesn't allow duplicate keys in the first place, and
according to GitLab docs
(https://docs.gitlab.com/ci/yaml/yaml_optimization/#anchors), the
latest key overrides the earlier entries.

- - - - -
e5cb5491 by Cheng Shao at 2026-01-24T07:12:34-05:00
hadrian: drop obsolete configure/make builder logic for libffi

This patch drops obsolete hadrian logic around `Configure
libffiPath`/`Make libffiPath` builders, they are no longer needed
after libffi-clib has landed. Closes #26815.

- - - - -
2d160222 by Simon Hengel at 2026-01-24T07:13:17-05:00
Fix typo in roles.rst
- - - - -
56db94f7 by Peter Trommler at 2026-01-26T11:26:18+01:00
PPC NCG: Generate clear right insn at arch width

The clear right immediate (clrrxi) is only available in word and
doubleword width. Generate clrrxi instructions at architecture
width for all MachOp widths.

Fixes #24145

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5957a8ad by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00
Add operations for obtaining operating-system handles

This contribution implements CLC proposal #369. It adds operations for
obtaining POSIX file descriptors and Windows handles that underlie
Haskell handles. Those operating system handles can also be obtained
without such additional operations, but this is more involved and, more
importantly, requires using internals.

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86a0510c by Greg Steuck at 2026-01-27T06:12:34-05:00
Move flags to precede patterns for grep and read files directly

This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
There's no reason to use cat and pipe where direct file argument works.

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50761451 by Cheng Shao at 2026-01-27T21:51:23-05:00
ci: update darwin boot ghc to 9.10.3

This patch updates darwin boot ghc to 9.10.3, along with other related
updates, and pays off some technical debt here:

- Update `nixpkgs` and use the `nixpkgs-25.05-darwin` channel.
- Update the `niv` template.
- Update LLVM to 21 and update `llvm-targets` to reflect LLVM 21
  layout changes for arm64/x86_64 darwin targets.
- Use `stdenvNoCC` to prevent nix packaged apple sdk from being used
  by boot ghc, and manually set `DEVELOPER_DIR`/`SDKROOT` to enforce
  the usage of system-wide command line sdk for macos.
- When building nix derivation for boot ghc, run `configure` via the
  `arch` command so that `configure` and its subprocesses pick up the
  manually specified architecture.
- Remove the previous horrible hack that obliterates `configure` to
  make autoconf test result in true. `configure` now properly does its
  job.
- Remove the now obsolete configure args and post install settings
  file patching logic.
- Use `scheme-small` for texlive to avoid build failures in certain
  unused texlive packages, especially on x86_64-darwin.

- - - - -
94dcd15e by Matthew Pickering at 2026-01-27T21:52:05-05:00
Evaluate backtraces for "error" exceptions at the moment they are thrown

See Note [Capturing the backtrace in throw] and
Note [Hiding precise exception signature in throw] which explain the
implementation.

This commit makes `error` and `throw` behave the same with regard to
backtraces. Previously, exceptions raised by `error` would not contain
useful IPE backtraces.

I did try and implement `error` in terms of `throw` but it started to
involve putting diverging functions into hs-boot files, which seemed to
risky if the compiler wouldn't be able to see if applying a function
would diverge.

CLC proposal: https://github.com/haskell/core-libraries-committee/issues/383

Fixes #26751

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ef35e3ea by Teo Camarasu at 2026-01-27T21:52:46-05:00
ghc-internal: move all Data instances to Data.Data

Most instances of Data are defined in GHC.Internal.Data.Data.
Let's move all remaining instance there.

This moves other modules down in the dependency hierarchy allowing for
more parallelism, and it decreases the likelihood that we would need to
load this heavy .hi file if we don't actually need it.

Resolves #26830

Metric Decrease:
    T12227
    T16875

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5e0ec555 by sheaf at 2026-01-28T06:56:38-05:00
Add test case for #25679

This commit adds the T25679 test case. The test now passes, thanks to
commit 1e53277af36d3f0b6ad5491f70ffc5593a49dcfd.

Fixes #25679

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f1cd1611 by sheaf at 2026-01-28T06:56:38-05:00
Improve defaulting of representational equalities

This commit makes the defaulting of representational equalities, introduced
in 1e53277a, a little bit more robust. Now, instead of calling the eager
unifier, it calls the full-blown constraint solver, which means that it can
handle some subtle situations, e.g. involving functional dependencies and
type-family injectivity annotations, such as:

  type family F a = r | r -> a
  type instance F Int = Bool

  [W] F beta ~R Bool

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25edf516 by sheaf at 2026-01-28T06:56:38-05:00
Improve errors for unsolved representational equalities

This commit adds a new field of CtLoc, CtExplanations, which allows the
typechecker to leave some information about what it has done. For the moment,
it is only used to improve error messages for unsolved representational
equalities. The typechecker will now accumulate, when unifying at
representational role:

  - out-of-scope newtype constructors,
  - type constructors that have nominal role in a certain argument,
  - over-saturated type constructors,
  - AppTys, e.g. `c a ~R# c b`, to report that we must assume that 'c' has
    nominal role in its parameters,
  - data family applications that do not reduce, potentially preventing
    newtype unwrapping.

Now, instead of having to re-construct the possible errors after the fact,
we simply consult the CtExplanations field.

Additionally, this commit modifies the typechecker error messages that
concern out-of-scope newtype constructors. The error message now depends
on whether we have an import suggestion to provide to the user:

  - If we have an import suggestion for the newtype constructor,
    the message will be of the form:

      The data constructor MkN of the newtype N is out of scope
      Suggested fix: add 'MkN' to the import list in the import of 'M'

  - If we don't have any import suggestions, the message will be
    of the form:

      NB: The type 'N' is an opaque newtype, whose constructor is hidden

Fixes #15850, #20289, #20468, #23731, #25949, #26137

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4d0e6da1 by Simon Peyton Jones at 2026-01-28T06:57:19-05:00
Fix two bugs in short-cut constraint solving

There are two main changes here:

* Use `isSolvedWC` rather than `isEmptyWC` in `tryShortCutSolver`
  The residual constraint may have some fully-solved, but
  still-there implications, and we don't want them to abort short
  cut solving!  That bug caused #26805.

* In the short-cut solver, we abandon the fully-solved residual
  constraint; but we may thereby lose track of Givens that are
  needed, and either report them as redundant or prune evidence
  bindings that are in fact needed.

  This bug stopped the `constraints` package from compiling;
  see the trail in !15389.

The second bug led me to (another) significant refactoring
of the mechanism for tracking needed EvIds.   See the new
   Note [Tracking needed EvIds] in GHC.Tc.Solver.Solve
It's simpler and much less head-scratchy now.

Some particulars:

* An EvBindsVar now tracks NeededEvIds

* We deal with NeededEvIds for an implication only when it is
  fully solved.  Much simpler!

* `tryShortCutTcS` now takes a `TcM WantedConstraints` rather than
  `TcM Bool`, so that is can plumb the needed EvIds correctly.

* Remove `ic_need` and `ic_need_implic` from Implication (hooray),
  and add `ics_dm` and `ics_non_dm` to `IC_Solved`.

Pure refactor
* Shorten data constructor `CoercionHole` to `CH`, following
  general practice in GHC.
* Rename `EvBindMap` to `EvBindsMap` for consistency

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662480b7 by Cheng Shao at 2026-01-28T06:58:00-05:00
ci: use debian validate bindists instead of fedora release bindists in testing stage

This patch changes the `abi-test`, `hadrian-multi` and `perf` jobs in
the full-ci pipeline testing stage to use debian validate bindists
instead of fedora release bindists, to increase pipeline level
parallelism and allow full-ci pipelines to complete earlier. Closes #26818.

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39581ec6 by Cheng Shao at 2026-01-28T06:58:40-05:00
ci: run perf test with -j$cores

This patch makes the perf ci job compile Cabal with -j$cores to speed
up the job.

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607b287b by Wolfgang Jeltsch at 2026-01-28T15:41:53+02:00
Remove `GHC.Desugar` from `base`

`GHC.Desugar` was deprecated and should have been removed in GHC 9.14.
However, the removal was forgotten, although there was a code block that
was intended to trigger a compilation error when the GHC version in use
was 9.14 or later. This code sadly didn’t work, because the
`__GLASGOW_HASKELL__` macro was misspelled as `__GLASGOW_HASKELL`.

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e8f5a45d by sterni at 2026-01-29T04:19:18-05:00
users_guide: fix runtime error during build with Sphinx 9.1.0

Appears that pathto is stricter about what it accepts now.
Tested Sphinx 8.2.3 and 9.1.0 on the ghc-9.10 branch.

Resolves #26810.

Co-authored-by: Martin Weinelt <hexa@darmstadt.ccc.de>

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ce2d62fb by Jessica Clarke at 2026-01-29T19:48:51-05:00
PPC NCG: Use libcall for 64-bit cmpxchg on 32-bit PowerPC

There is no native instruction for this, and even if there were a
register pair version we could use, the implementation here is assuming
the values fit in a single register, and we end up only using / defining
the low halves of the registers.

Fixes: b4d39adbb5 ("PrimOps: Add CAS op for all int sizes")
Fixes: #23969

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43d97761 by Michael Karcher at 2026-01-29T19:49:43-05:00
NCG for PPC: add pattern for CmmRegOff to iselExpr64

Closes #26828
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aeeb4a20 by Matthew Pickering at 2026-01-30T11:42:47-05:00
determinism: Use deterministic map for Strings in TyLitMap

When generating typeable evidence the types we need evidence for all
cached in a TypeMap, the order terms are retrieved from a type map
determines the order the bindings appear in the program.

A TypeMap is quite diligent to use deterministic maps, apart from in the
TyLitMap, which uses a UniqFM for storing strings, whose ordering
depends on the Unique of the FastString.

This can cause non-deterministic .hi and .o files.

An unexpected side-effect is the error message but RecordDotSyntaxFail8
changing. I looked into this with Sam and this change caused the
constraints to be solved in a different order which results in a
slightly different error message. I have accepted the new test, since
the output before was non-deterministic and the new output is consistent
with the other messages in that file.

Fixes #26846

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9e4d70c2 by Andrew Lelechenko at 2026-01-30T11:43:29-05:00
Upgrade text submodule to 2.1.4

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631fa5ae by Recursion Ninja at 2026-01-31T22:30:11+00:00
Decouple `L.S.H.Decls` from importing `GHC.Types.Basic`

Data-types within `GHC.Types.Basic` which describe components of
the AST are migrated to `Language.Haskell.Syntax.Basic`. Related
function definitions are also moved.

Types moved to L.H.S. because they are part of the AST:
  * TopLevelFlag
  * RuleName

Types moved from L.H.S. to GHC.Hs. because they are not needed in the AST:
  * TyConFlavour
  * TypeOrData
  * NewOrData

Migrated instances:
  * `Outputable` instances moved to in `GHC.Utils.Outputable`
  * `Binary` instance of `Boxity` moved to to `GHC.Utils.Binary`
  * Other `Binary` instances are orphans to be migrated later.

The `OverlapMode` data-type is given a TTG extension point.
The `OverlapFlag` data-type, which depends on `OverlapMode`,
is updated to support `OverlapMode` with a GHC "pass" type paramerter.
In order to avoid module import cycles, `OverlapMode` and `OverlapFlag`
are migrated to new modules (no way around this).

  * Migrated `OverlapMode` to new module `Language.Haskell.Syntax.Overlap`
  * Migrated `OverlapFlag` to new module `GHC.Hs.Decls.Overlap`

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9769cc03 by Simon Hengel at 2026-02-01T04:21:03-05:00
Update the documentation for MultiWayIf (fixes #25376)

(so that it matches the implementation)

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5fc9442a by Peter Trommler at 2026-02-01T04:21:44-05:00
hadrian: Fix dependency generation for assembler

Assembler files allow # for comments unless in column 1. A modern
cpp for C treats those a preprocessor directives. We tell gcc that
a .S file is assembler with cpp and not C.

Fixes #26819

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269c4087 by Simon Peyton Jones at 2026-02-01T19:38:10-05:00
Include current phase in the range for rule/unfoldings

This MR fixes a bad loop in the compiler: #26826.

The fix is to add (WAR2) to
   Note [What is active in the RHS of a RULE or unfolding?]
in GHC.Core.Opt.Simplify.Utils

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ddf1434f by Vladislav Zavialov at 2026-02-01T19:38:52-05:00
Refactor: merge HsMultilineString into HsString (#26860)

Before this patch, HsLit defined two separate constructors to represent
single-line and multi-line strings:

	data HsLit x
	  ...
	  | HsString (XHsString x) FastString
	  | HsMultilineString (XHsMultilineString x) FastString

I found this to be an unnecessary complication and an obstacle to unifying
HsLit with HsTyLit. Now we use HsString for both kinds of literals.

One user-facing change here is `ppr (HsString st s)` behaving differently for
single-line strings containing newlines:

	x = "first line \
	    \asdf\n\
	    \second line"

Previously, the literal was fed to `ftext` with its newlines, producing an
ill-formed SDoc. This issue is now addressed by using `split` for both
single-line and multi-line strings:

	vcat $ map text $ split '\n' (unpackFS src)

See the parser/should_fail/T26860ppr test.

In addition (and unrelatedly to the main payload of this patch),
drop the unused pmPprHsLit helper.

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2b4f463c by Simon Peyton Jones at 2026-02-02T17:32:32+00:00
Remove exprIsCheap from doFloatFromRhs

See #26854 and Note [Float when expandable]

This patch simplifies the code, by removing an extra unnecessary test.

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9db7f21f by Brandon Chinn at 2026-02-03T09:15:10-05:00
Refactor: make function patterns exhaustive

Also added missing (==) logic for:
  * HsMultilineString
  * HsInt{8,16,32}
  * HsWord{8,16,32}

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aa9c5e2c by Hécate Kleidukos at 2026-02-03T15:58:35-05:00
driver: Hide source paths at verbosity level 1 by default

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c64cca1e by mangoiv at 2026-02-03T15:59:29-05:00
ExplicitLevelImports: check staging for types just like for values

Previously, imported types were entirely exempted from staging checks as
the implicit stage persistance assumed to be all imported types to be
well staged. ExplicitLevelImports' change specification, however, does
not do such an exemption. Thus we want to introduce such a check, just
like we have for values.
ExplicitLevelImports does not, however, talk about local names - from
its perspective, we could theoretically keep treating locally introduced
types specially - e.g. an ill-staged used in a quote would only emit a
warning, not an error. To allow for a potential future migration away
from such wrinkles as the staging check in notFound
(see  Note [Out of scope might be a staging error]) we consistently do
the strict staging check that we also do for value if ExplicitLevelImports
is on.

Closes #26098

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5f0dbeb6 by Simon Hengel at 2026-02-03T16:00:12-05:00
Use Haddock formatting in deprecation message of `initNameCache`
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01ecb612 by Andreas Klebinger at 2026-02-04T09:56:25-05:00
testsuite: Explicitly use utf-8 encoding in rts-includes linter.

Not doing so caused failures on windows, as python failed to pick a
reasonable encoding even with locale set.

Fixes #26850

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ea0d1317 by Zubin Duggal at 2026-02-04T09:57:06-05:00
Bump transformers submodule to 0.6.3.0

Fixes #26790

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cbe4300e by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix subtle bug in GHC.Core.Utils.mkTick

This patch fixes a decade-old bug in `mkTick`, which
could generate type-incorrect code!  See the diagnosis
in #26772.

The new code is simpler and easier to understand.
(As #26772 says, I think it could be improved further.)

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a193a8da by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Modify a debug-trace in the Simplifier

...just to show a bit more information.

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b579dfdc by Simon Peyton Jones at 2026-02-05T04:31:04-05:00
Fix long-standing interaction between ticks and casts

The code for Note [Eliminate Identity Cases] was simply wrong when
ticks and casts interacted.  This patch fixes the interaction.

It was shown up when validating #26772, although it's not the exactly
the bug that's reported by #26772.  Nor is it easy to reproduce, hence
no regression test.

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fac0de1e by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump Cabal submodule to 3.16.1.0

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00589122 by Cheng Shao at 2026-02-05T04:31:49-05:00
libraries: bump deepseq submodule to 1.5.2.0

Also:

- Get rid of usage of deprecated `NFData` function instance in the
  compiler
- `T21391` still relies on `NFData` function instance, add
  `-Wno-deprecations` for the time being.

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84474c71 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump directory submodule to 1.3.10.1

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1a9f4662 by Cheng Shao at 2026-02-05T04:31:50-05:00
libraries: bump exceptions submodule to 0.10.12

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2e39a340 by Peng Fan at 2026-02-07T03:42:01-05:00
NCG/LA64: adjust register usage to avoid src-register being clobbered

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9faf1b35 by Teo Camarasu at 2026-02-07T03:42:43-05:00
ghc-internal: Delete unnecessary GHC.Internal.Data.Ix

This module merely re-exports GHC.Internal.Ix. It was copied from
`base` when `ghc-internal` was split, but there is no reason to have
this now. So, let's delete it.

Resolves #26848

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d112b440 by Sven Tennie at 2026-02-07T10:47:56-05:00
Add cabal.project file to generate-ci

This fixes the HLS setup for our CI code generation script
(generate-ci).

The project file simply makes `generate-ci` of the cabal file
discoverable.

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5339f6f0 by Andreas Klebinger at 2026-02-07T10:48:40-05:00
CI: Don't collapse test results.

This puts test output back into the primary test log instead of a
subsection removing the need to expand a section to see test results.

While the intention was good in practice the old behaviour mostly wastes time
by requiring expansion of the section.

Fixes #26882

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0e1cd2e0 by Evan Piro at 2026-02-08T10:35:16-08:00
Linker.MacOS reduce dynflags import

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1c79a4cd by Michael Alan Dorman at 2026-02-09T08:11:51-05:00
Remove `extra_src_files` variable from `testsuite/driver/testlib.py`

While reading through the test harness code, I noticed this variable
with a TODO attached that referenced #12223.  Although that bug is
closed, it strongly implied that this special-case variable that only
affected a single test was expected to be removed at some point.

I also looked at 3415bcaa0b1903b5e12dfaadb5b774718e406eab---where it
was added---whose commit message suggested that it would have been
desirable to remove it, but that there were special circumstances that
meant it had to remain (though it doesn't elucidate what those special
circumstances are).

However, the special circumstances were mentioned as if the test was
in a different location than is currently is, so I decided to try
changing the test to use the standard `extra_files` mechanism, which
works in local testing.

This also seems like a reasonable time to remove the script that was
originally used in the transition, since it doesn't really serve a
purpose anymore.

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0020e38a by Matthew Pickering at 2026-02-09T17:29:14-05:00
determinism: Use a stable sort in WithHsDocIdentifiers binary instance

`WithHsDocIdentifiers` is defined as

```
 71 data WithHsDocIdentifiers a pass = WithHsDocIdentifiers
 72   { hsDocString      :: !a
 73   , hsDocIdentifiers :: ![Located (IdP pass)]
 74   }
```

This list of names is populated from `rnHsDocIdentifiers`, which calls
`lookupGRE`, which calls `lookupOccEnv_AllNameSpaces`, which calls
`nonDetEltsUFM` and returns the results in an order depending on
uniques.

Sorting the list with a stable sort before returning the interface makes
the output deterministic and follows the approach taken by other fields
in `Docs`.

Fixes #26858

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89898ce6 by echoumcp1 at 2026-02-09T17:30:01-05:00
Replace putstrln with logMsg in handleSeqHValueStatus

Fixes #26549

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7c52c4f9 by John Paul Adrian Glaubitz at 2026-02-10T13:52:43-05:00
rts: Switch prim to use modern atomic compiler builtins

The __sync_*() atomic compiler builtins have been deprecated in GCC
for a while now and also don't provide variants for 64-bit values
such as __sync_fetch_and_add_8().

Thus, replace them with the modern __atomic_*() compiler builtins and
while we're at it, also drop the helper macro CAS_NAND() which is now
no longer needed since we stopped using the __sync_*() compiler builtins
altogether.

Co-authored-by: Ilias Tsitsimpis <iliastsi@debian.org>

Fixes #26729

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cf60850a by Recursion Ninja at 2026-02-10T13:53:27-05:00
Decoupling L.H.S.Decls from GHC.Types.ForeignCall

  - Adding TTG extension point for 'CCallTarget'
  - Adding TTG extension point for 'CType'
  - Adding TTG extension point for 'Header'
  - Moving ForeignCall types that do not need extension
    to new L.H.S.Decls.Foreign module
  - Replacing 'Bool' parameters with descriptive data-types
    to increase clairty and prevent "Boolean Blindness"

- - - - -
11a04cbb by Eric Lee at 2026-02-11T09:20:46-05:00
Derive Semigroup/Monoid for instances believed could be derived in #25871

- - - - -
15d9ce44 by Eric Lee at 2026-02-11T09:20:46-05:00
add Ghc.Data.Pair deriving

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c85dc170 by Evan Piro at 2026-02-11T09:21:45-05:00
Linker.MacOS reduce options import

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a541dd83 by Chris Wendt at 2026-02-11T16:06:41-05:00
Initialize plugins for `:set +c` in GHCi

Fixes #23110.

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0f5a73bc by Cheng Shao at 2026-02-11T16:07:27-05:00
compiler: add Binary Text instance

This patch adds `Binary` instance for strict `Text`, in preparation of
making `Text` usable in certain GHC API use cases (e.g. haddock). This
also introduces `text` as a direct dependency of the `ghc` package.

- - - - -
9e58b8a1 by Cheng Shao at 2026-02-11T16:08:10-05:00
ghc-toolchain: add C11 check

This patch partially reverts commit
b8307eab80c5809df5405d76c822bf86877f5960 that removed C99 check in
autoconf/ghc-toolchain. Now we:

- No longer re-implement `FP_SET_CFLAGS_C11` similar to
  `FP_SET_CFLAGS_C99` in the past, since autoconf doesn't provide a
  convenient `AC_PROG_CC_C11` function. ghc-toolchain will handle it
  anyway.
- The Cmm CPP C99 check is relanded and repurposed for C11.
- The C99 logic in ghc-toolchain is relanded and repurposed for C11.
- The C99 check in Stg.h is corrected to check for C11. The obsolete
  _ISOC99_SOURCE trick is dropped.
- Usages of `-std=gnu99` in the testsuite are corrected to use
  `-std=gnu11`.

Closes #26908.

- - - - -
4df0adf6 by Simon Peyton Jones at 2026-02-11T21:50:13-05:00
Simplify the treatment of static forms

This MR implements GHC proposal 732: simplify static forms,
   https://github.com/ghc-proposals/ghc-proposals/pull/732
thereby addressing #26556.

See `Note [Grand plan for static forms]` in GHC.Iface.Tidy.StaticPtrTable

The main changes are:

* There is a new, simple rule for (static e), namely that the free
  term variables of `e` must be bound at top level.  The check is
  done in the `HsStatic` case of `GHC.Rename.Expr.rnExpr`

* That in turn substantially simplifies the info that the typechecker
  carries around in its type environment.  Hooray.

* The desugarer emits static bindings to top level directly; see the
  `HsStatic` case of `dsExpr`.

* There is no longer any special static-related magic in the FloatOut
  pass.  And the main Simplifier pipeline no longer needs a special case
  to run FloatOut even with -O0.  Hooray.

All this forced an unexpected change to the pattern match checker. It
recursively invokes the main Hs desugarer when it wants to take a look
at a term to spot some special cases (notably constructor applications).
We don't want to emit any nested (static e) bindings to top level a
second time!  Yikes.

That forced a modest refactor in GHC.HsToCore.Pmc:

* The `dsl_nablas` field of `DsLclEnv` now has a `NoPmc` case, which says
  "I'm desugaring just for pattern-match checking purposes".

* When that flag is set we don't emit static binds.

That in turn forces a cascade of refactoring, but the net effect is an
improvement; less risk of duplicated (even exponential?) work.

See Note [Desugaring HsExpr during pattern-match checking].

10% metric decrease, on some architectures, of compile-time max-bytes-used on T15304.

Metric Decrease:
    T15304

- - - - -
7922f728 by Teo Camarasu at 2026-02-11T21:50:58-05:00
ghc-internal: avoid depending on GHC.Internal.Exts

This module is mostly just re-exports. It made sense as a user-facing
module, but there's no good reason ghc-internal modules should depend on
it and doing so linearises the module graph

- move considerAccessible to GHC.Internal.Magic

Previously it lived in GHC.Internal.Exts, but it really deserves to live
along with the other magic function, which are already re-exported from .Exts

- move maxTupleSize to GHC.Internal.Tuple

This previously lived in GHC.Internal.Exts but a comment already said it
should be moved to .Tuple

Resolves #26832

- - - - -
b6a4a29b by Eric Lee at 2026-02-11T21:51:55-05:00
Remove unused Semigroup imports to fix GHC 9.14 bootstrapping

- - - - -
99d8c146 by Simon Peyton Jones at 2026-02-12T17:36:59+00:00
Fix subtle bug in cast worker/wrapper

See (CWw4) in Note [Cast worker/wrapper].

The true payload is in the change to the definition of
   GHC.Types.Id.Info.hasInlineUnfolding
Everthing else is just documentation.

There is a 2% compile time decrease for T13056;
I'll take the win!

Metric Decrease:
    T13056

- - - - -
530e8e58 by Simon Peyton Jones at 2026-02-12T20:17:23-05:00
Add regression tests for four StaticPtr bugs

Tickets #26545, #24464, #24773, #16981 are all solved by the
recently-landed MR

    commit 318ee13bcffa6aa8df42ba442ccd92aa0f7e210c
    Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
    Date:   Mon Oct 20 23:07:20 2025 +0100

    Simplify the treatment of static forms

This MR just adds regression tests for them.

- - - - -
4157160f by Cheng Shao at 2026-02-13T06:27:04-05:00
ci: remove unused hlint-ghc-and-base job definition

This patch removes the unused `hlint-ghc-and-base` job definition,
it's never run since !9806. Note that hadrian lint rules still work
locally, so anyone that wishes to run hlint on the codebase can
continue to do so in their local worktree.

- - - - -
039f1977 by Cheng Shao at 2026-02-13T06:27:47-05:00
wasm: use import.meta.main for proper distinction of nodejs main modules

This patch uses `import.meta.main` for proper distinction of nodejs
main modules, especially when the main module might be installed as a
symlink. Fixes #26916.

- - - - -
14f485ee by ARATA Mizuki at 2026-02-17T09:09:24+09:00
Support more x86 extensions: AVX-512 {BW,DQ,VL} and GFNI

Also, mark AVX-512 ER and PF as deprecated.

AVX-512 instructions can be used for certain 64-bit integer vector operations.

GFNI can be used to implement bitReverse (currently not used by NCG, but LLVM may use it).

Closes #26406
Addresses #26509

- - - - -
016f79d5 by fendor at 2026-02-17T09:16:16-05:00
Hide implementation details from base exception stack traces

Ensure we hide the implementation details of the exception throwing mechanisms:

* `undefined`
* `throwSTM`
* `throw`
* `throwIO`
* `error`

The `HasCallStackBacktrace` should always have a length of exactly 1,
not showing internal implementation details in the stack trace, as these
are vastly distracting to end users.

CLC proposal [#387](https://github.com/haskell/core-libraries-committee/issues/387)

- - - - -
4f2840f2 by Brian J. Cardiff at 2026-02-17T17:04:08-05:00
configure: Accept happy-2.2

In Jan 2026 happy-2.2 was released. The most sensible change is https://github.com/haskell/happy/issues/335 which didn't trigger in a fresh build

- - - - -
10b4d364 by Duncan Coutts at 2026-02-17T17:04:52-05:00
Fix errors in the documentation of the eventlog STOP_THREAD status codes

Fix the code for BlockedOnMsgThrowTo.

Document all the known historical warts.

Fixes issue #26867

- - - - -
c5e15b8b by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: use snippets for all list examples

- generate snippet output for docs
- reduce font size to better fit snippets
- Use only directive to guard html snippets
- Add latex snippets for lists

- - - - -
d388bac1 by Phil de Joux at 2026-02-18T05:07:36-05:00
haddock: Place the snippet input and output together

- Put the output seemingly inside the example box

- - - - -
016fa306 by Samuel Thibault at 2026-02-18T05:08:35-05:00
Fix linking against libm by moving the -lm option

For those systems that need -lm for getting math functions, this is
currently added on the link line very early, before the object files being
linked together. Newer toolchains enable --as-needed by default, which means
-lm is ignored at that point because no object requires a math function
yet. With such toolchains, we thus have to add -lm after the objects, so the
linker actually includes libm in the link.

- - - - -
68bd0805 by Teo Camarasu at 2026-02-18T05:09:19-05:00
ghc-internal:  Move GHC.Internal.Data.Bool to base

This is a tiny module that only defines bool :: Bool -> a -> a -> a. We can just move this to base and delete it from ghc-internal. If we want this functionality there we can just use a case statement or if-then expression.

Resolves 26865

- - - - -
4c40df3d by fendor at 2026-02-20T10:24:48-05:00
Add optional `SrcLoc` to `StackAnnotation` class

`StackAnnotation`s give access to an optional `SrcLoc` field that
user-added stack annotations can use to provide better backtraces in both error
messages and when decoding the callstack.

We update builtin stack annotations such as `StringAnnotation` and
`ShowAnnotation` to also capture the `SrcLoc` of the current `CallStack`
to improve backtraces by default (if stack annotations are used).

This change is backwards compatible with GHC 9.14.1.

- - - - -
fd9aaa28 by Simon Hengel at 2026-02-20T10:25:33-05:00
docs: Fix grammar in explicit_namespaces.rst

- - - - -
44354255 by Vo Minh Thu at 2026-02-20T18:53:06-05:00
GHCi: add a :version command.

This looks like:

    ghci> :version
    GHCi, version 9.11.20240322

This closes #24576.

Co-Author: Markus Läll <markus.l2ll@gmail.com>

- - - - -
eab3dbba by Andreas Klebinger at 2026-02-20T18:53:51-05:00
hadrian/build-cabal: Better respect and utilize -j

* We now respect -j<n> for the cabal invocation to build hadrian rather
  than hardcoding -j
* We use the --semaphore flag to ensure cabal/ghc build the hadrian
  executable in parallel using the -jsem mechanism.

Saves 10-15s on fresh builds for me.

Fixes #26876

- - - - -
17839248 by Teo Camarasu at 2026-02-24T08:36:03-05:00
ghc-internal: avoid depending on GHC.Internal.Control.Monad.Fix

This module contains the definition of MonadFix, since we want an
instance for IO, that instance requires a lot of machinery and we want
to avoid an orphan instance, this will naturally be quite high up in the
dependency graph.

So we want to avoid other modules depending on it as far as possible.

On Windows, the IO manager depends on the RTSFlags type, which
transtively depends on MonadFix. We refactor things to avoid this
dependency, which would have caused a regression.

Resolves #26875

Metric Decrease:
    T12227

- - - - -
fa88d09a by Wolfgang Jeltsch at 2026-02-24T08:36:47-05:00
Refine the imports of `System.IO.OS`

Commit 68bd08055594b8cbf6148a72d108786deb6c12a1 replaced the
`GHC.Internal.Data.Bool` import by a `GHC.Internal.Base` import.
However, while the `GHC.Internal.Data.Bool` import was conditional and
partial, the `GHC.Internal.Base` import is unconditional and total. As a
result, the import list is not tuned to import only the necessary bits
anymore, and furthermore GHC emits a lot of warnings about redundant
imports.

This commit makes the `GHC.Internal.Base` import conditional and partial
in the same way that the `GHC.Internal.Data.Bool` import was.

- - - - -
c951fef1 by Cheng Shao at 2026-02-25T20:58:28+00:00
wasm: add /assets endpoint to serve user-specified assets

This patch adds an `/assets` endpoint to the wasm dyld http server, so
that users can also fetch assets from the same host with sensible
default MIME types, without needing a separate http server for assets
that also introduces CORS headaches:

- A `-fghci-browser-assets-dir` driver flag is added to specify the
  assets root directory (defaults to `$PWD`)
- The dyld http server fetches `mime-db` on demand and uses it as
  source of truth for mime types.

Closes #26951.

- - - - -
dde22f97 by Sylvain Henry at 2026-02-26T13:14:03-05:00
Fix -fcheck-prim-bounds for non constant args (#26958)

Previously we were only checking bounds for constant (literal)
arguments!

I've refactored the code to simplify the generation of out-of-line Cmm
code for the primop composed of some inline code + some call to an
external Cmm function.

- - - - -
bd3eba86 by Vladislav Zavialov at 2026-02-27T05:48:01-05:00
Check for negative type literals in the type checker (#26861)

GHC disallows negative type literals (e.g., -1), as tested by T8306 and
T8412. This check is currently performed in the renamer:

  rnHsTyLit tyLit@(HsNumTy x i) = do
    when (i < 0) $
      addErr $ TcRnNegativeNumTypeLiteral tyLit

However, this check can be bypassed using RequiredTypeArguments
(see the new test case T26861). Prior to this patch, such programs
caused the compiler to hang instead of reporting a proper error.
This patch addresses the issue by adding an equivalent check in
the type checker, namely in tcHsType.

The diff is deliberately minimal to facilitate backporting. A more
comprehensive rework of HsTyLit is planned for a separate commit.

- - - - -
faf14e0c by Vladislav Zavialov at 2026-02-27T05:48:45-05:00
Consistent pretty-printing of HsString, HsIsString, HsStrTy

Factor out a helper to pretty-print string literals, thus fixing newline
handling for overloaded string literals and type literals.

Test cases: T26860ppr T26860ppr_overloaded T26860ppr_tylit

Follow up to ddf1434ff9bb08cfef3c93f23de6b83ec698aa27

- - - - -
f108a972 by Arnaud Spiwack at 2026-02-27T12:53:01-05:00
Make list comprehension completely non-linear

Fixes #25081

From the note:

The usefulness of list comprehension in conjunction with linear types is dubious.
After all, statements are made to be run many times, for instance in

```haskell
[u | y <- [0,1], stmts]
```

both `u` and `stmts` are going to be run several times.

In principle, though, there are some position in a monad comprehension
expression which could be considered linear. We could try and make it so that
these positions are considered linear by the typechecker, but in practice the
desugarer doesn't take enough care to ensure that these are indeed desugared to
linear sites. We tried in the past, and it turned out that we'd miss a
desugaring corner case (#25772).

Until there's a demand for this very specific improvement, let's instead be
conservative, and consider list comprehension to be completely non-linear.

- - - - -
ae799cab by Simon Jakobi at 2026-02-27T12:53:54-05:00
PmAltConSet: Use Data.Set instead of Data.Map

...to store `PmLit`s.

The Map was only used to map keys to themselves.
Changing the Map to a Set saves a Word of memory per entry.

Resolves #26756.

- - - - -
dcd7819c by Vladislav Zavialov at 2026-02-27T18:46:03-05:00
Drop HsTyLit in favor of HsLit (#26862, #25121)

This patch is a small step towards unification of HsExpr and HsType,
taking care of literals (HsLit) and type literals (HsTyLit).

Additionally, it improves error messages for unsupported type literals,
such as unboxed or fractional literals (test cases: T26862, T26862_th).

Changes to the AST:

* Use HsLit           where HsTyLit   was previously used
* Use HsChar          where HsCharTy  was previously used
* Use HsString        where HsStrTy   was previously used
* Use HsNatural (NEW) where HsNumTy   was previously used
* Use HsDouble  (NEW) to represent unsupported fractional type literals

Changes to logic:

* Parse unboxed and fractional type literals (to be rejected later)

* Drop the check for negative literals in the renamer (rnHsTyLit)
  in favor of checking in the type checker (tc_hs_lit_ty)

* Check for invalid type literals in TH (repTyLit) and report
  unrepresentable literals with ThUnsupportedTyLit

* Allow negative type literals in TH (numTyLit). This is fine as
  these will be taken care of at splice time (test case: T8306_th)

- - - - -
c927954f by Vladislav Zavialov at 2026-02-27T18:46:50-05:00
Increase test coverage of diagnostics

Add test cases for the previously untested diagnostics:
  [GHC-01239] PsErrIfInFunAppExpr
  [GHC-04807] PsErrProcInFunAppExpr
  [GHC-08195] PsErrInvalidRecordCon
  [GHC-16863] PsErrUnsupportedBoxedSumPat
  [GHC-18910] PsErrSemiColonsInCondCmd
  [GHC-24737] PsErrInvalidWhereBindInPatSynDecl
  [GHC-25037] PsErrCaseInFunAppExpr
  [GHC-25078] PsErrPrecedenceOutOfRange
  [GHC-28021] PsErrRecordSyntaxInPatSynDecl
  [GHC-35827] TcRnNonOverloadedSpecialisePragma
  [GHC-40845] PsErrUnpackDataCon
  [GHC-45106] PsErrInvalidInfixHole
  [GHC-50396] PsErrInvalidRuleActivationMarker
  [GHC-63930] MultiWayIfWithoutAlts
  [GHC-65536] PsErrNoSingleWhereBindInPatSynDecl
  [GHC-67630] PsErrMDoInFunAppExpr
  [GHC-70526] PsErrLetCmdInFunAppCmd
  [GHC-77808] PsErrDoCmdInFunAppCmd
  [GHC-86934] ClassPE
  [GHC-90355] PsErrLetInFunAppExpr
  [GHC-91745] CasesExprWithoutAlts
  [GHC-92971] PsErrCaseCmdInFunAppCmd
  [GHC-95644] PsErrBangPatWithoutSpace
  [GHC-97005] PsErrIfCmdInFunAppCmd

Remove unused error constructors:
  [GHC-44524] PsErrExpectedHyphen
  [GHC-91382] TcRnIllegalKindSignature

- - - - -
3a9470fd by Torsten Schmits at 2026-02-27T18:47:34-05:00
Avoid expensive computation for debug logging in `mergeDatabases` when log level is low

This computed and traversed a set intersection for every single
dependency unconditionally.

- - - - -
ea4c2cbd by Brandon Chinn at 2026-02-27T16:22:38-08:00
Implement QualifiedStrings (#26503)

See Note [Implementation of QualifiedStrings]

- - - - -
08bc245b by sheaf at 2026-03-01T11:11:54-05:00
Clean up join points, casts & ticks

This commit shores up the logic dealing with casts and ticks occurring
in between a join point binding and a jump.

Fixes #26642 #26929 #26693
Makes progress on #14610 #26157 #26422

Changes:

  - Remove 'GHC.Types.Tickish.TickishScoping' in favour of simpler
    predicates 'tickishHasNoScope'/'tickishHasSoftScope', as things were
    before commit 993975d3. This makes the code easier to read and
    document (fewer indirections).

  - Introduce 'canCollectArgsThroughTick' for consistent handling of
    ticks around PrimOps and other 'Id's that cannot be eta-reduced.
    See overhauled Note [Ticks and mandatory eta expansion].

  - New Note [JoinId vs TailCallInfo] in GHC.Core.SimpleOpt that explains
    robustness of JoinId vs fragility of TailCallInfo.

  - Allow casts/non-soft-scoped ticks to occur in between a join point
    binder and a jump, but only in Core Prep.
    See Note [Join points, casts, and ticks] and
    Note [Join points, casts, and ticks... in Core Prep]
    in GHC.Core.Opt.Simplify.Iteration.

    Also update Core Lint to account for this.
    See Note [Linting join points with casts or ticks] in GHC.Core.Lint.

  - Update 'GHC.Core.Utils.mergeCaseAlts' to avoid pushing a cast in
    between a join point binding and its jumps. This fixes #26642.
    See the new (MC5) and (MC6) in Note [Merge Nested Cases].

  - Update float out to properly handle source note ticks. They are now
    properly floated out instead of being discarded.
    This increases the number of ticks in certain tests with -g.

Test cases: T26642 and TrickyJoins.

Metric increase due to more source note ticks with -g:

-------------------------
Metric Increase:
    libdir
    size_hello_artifact
    size_hello_unicode
-------------------------

- - - - -
476c4cdf by Sean D. Gillespie at 2026-03-02T10:14:37-05:00
Add SIMD absolute value on x86 and LLVM

On x86, absolute value of 32 bits or less is implemented with
PABSB/PABSW/PABSD if SSSE3 is available. Otherwise, there is a fallback
for SSE2. For 64 bit integers it uses VPABSQ, required by AVX-512VL,
with fallbacks for SSE4.2 and SSE2.

There is no dedicated instruction for floating point absolute value on
x86, so it is simulated using bitwise AND.

Absolute value for signed integers and floats are implemented by the
"llvm.abs/llvm.fabs" standard library intrinsics. This implementation
uses MachOps constructors, unlike non-vector floating point absolute
value, which uses CallishMachOps.

- - - - -
709448c0 by Sean D. Gillespie at 2026-03-02T10:14:46-05:00
Add SIMD floating point square root

On x86, this is implemented with the SQRTPS and SQRTPD instructions. On
LLVM, it uses the sqrt library intrinstic.

- - - - -
0deadf66 by Sean D. Gillespie at 2026-03-02T10:14:47-05:00
Improve error message for SIMD on aarch64

When encountering vector literals on aarch64, previously it would
throw:

    <no location info>: error:
        panic! (the 'impossible' happened)
      GHC version 9.15.20251219:
            getRegister' (CmmLit:CmmVec):

Now it is more consistent with the other vector operations:

    <no location info>: error:
        sorry! (unimplemented feature or known bug)
      GHC version 9.15.20251219:
            SIMD operations on AArch64 currently require the LLVM backend

- - - - -
7d64031b by Vladislav Zavialov at 2026-03-03T11:09:28-05:00
Replace maybeAddSpace with spaceIfSingleQuote

Simplify pretty-printing of HsTypes by using spaceIfSingleQuote.
This allows us to drop the unwieldy lhsTypeHasLeadingPromotionQuote
helper function.

Follow-up to 178c1fd830c78377ef5d338406a41e1d8eb5f0da

- - - - -
598db847 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Correct `hIsReadable` and `hIsWritable` for duplex handles

This contribution implements CLC proposal #371. It changes `hIsReadable`
and `hIsWritable` such that they always throw a respective exception
when encountering a closed or semi-closed handle, not just in the case
of a file handle.

- - - - -
b90201e5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Document `SemiClosedHandle`

- - - - -
c9df72b5 by Wolfgang Jeltsch at 2026-03-06T06:25:25-05:00
Tell users what “semi-closed” means for duplex handles

- - - - -
a8aa1868 by Ilias Tsitsimpis at 2026-03-06T06:26:29-05:00
Fix determinism of linker arguments

The switch from Data.Map to UniqMap in 3b5be05ac29 introduced
non-determinism in the order of packages passed to the linker.

This resulted in non-reproducible builds where the DT_NEEDED entries in
dynamic libraries were ordered differently across builds.

Fix the regression by explicitly sorting the package list derived from
UniqMap.

Fixes #26838

- - - - -
9b64ad3a by Matthew Pickering at 2026-03-06T06:27:16-05:00
determinism: Use a deterministic renaming when writing bytecode files

Now when writing the bytecode file, a counter and substitution are used
to provide deterministic keys to local variables (rather than relying on
uniques). This change ensures that `.gbc` are produced
deterministically.

Fixes #26499

- - - - -
d29800e0 by Teo Camarasu at 2026-03-06T06:28:46-05:00
ghc-internal: delete Version hs-boot loop

Version has a Read instance which needs Unicode but part of the Unicode interface is the unicode version. This is easy to resolve. We simply don't re-export the version from the Unicode module.

Resolves #26940

- - - - -
ad25af90 by Sylvain Henry at 2026-03-06T06:30:33-05:00
Linker: implement support for COMMON symbols (#6107)

Add some support for COMMON symbols. We don't support common symbols
having different sizes where the larger one is allocated after the
smaller one. The linker will fail with an appropriate error message if
it happens.

- - - - -
3b59f158 by Cheng Shao at 2026-03-06T06:31:16-05:00
compiler: fix redundant import of GHC.Hs.Lit

This patch removes a redundant import of `GHC.Hs.Lit` which causes a
ghc build failure with validate flavours when bootstrapping from 9.14.
Fixes #26972.

- - - - -
148d36f3 by Cheng Shao at 2026-03-06T06:32:01-05:00
compiler: avoid unneeded traversals in GHC.Unit.State

Following !15591, this patch avoids unneeded traversals in
`reportCycles`/`reportUnusable` when log verbosity is below given
threshold. Also applies `logVerbAtLeast` when appropriate.

Co-authored-by: Codex <codex@openai.com>

- - - - -
7e31367c by Cheng Shao at 2026-03-06T06:32:46-05:00
ghc-internal: fix redundant import in GHC.Internal.Event.Windows.ManagedThreadPool

This patch fixes redundant import in
`GHC.Internal.Event.Windows.ManagedThreadPool` that causes a
compilation error when building windows target with validate flavours
and bootstrapping from 9.14. Fixes #26976.

- - - - -
fc8b8e27 by sheaf at 2026-03-06T06:33:28-05:00
System.Info.fullCompilerVersion: add 'since' annot

Fixes #26973
- - - - -
c8238375 by Sylvain Henry at 2026-03-06T06:34:23-05:00
Hadrian: deprecate --bignum and automatically enable +native_bignum for JS

Deprecate --bignum=... to select the bignum backend. It's only used to
select the native backend, and this can be done with the +native_bignum
flavour transformer.

Additionally, we automatically enable +native_bignum for the JS target
because the GMP backend isn't supported.

- - - - -
a3ac7074 by Sylvain Henry at 2026-03-06T06:35:17-05:00
JS: fix putEnum/fromEnum (#24593)

Don't go through Word16 when serializing Enums.

- - - - -
0b36e96c by Andreas Klebinger at 2026-03-06T06:35:58-05:00
Docs: Document -fworker-wrapper-cbv default setting.

Fixes #26841

- - - - -
eca445e7 by mangoiv at 2026-03-07T05:02:36-05:00
drop deb9/10 from CI, add deb13

debian 9 and 10 are end of life, hence we drop them
from our CI, but we do add debian 13. Jobs that were
previously run on 9 and 10 run on 13, too, jobs that
were run on 10, are run on 11 now. Jobs that were
previously run on debian 12 are run on debian 13 now.
This MR also updates hadrian's bootstrap plans for that
reason.

Metric Decrease:
    T9872d

- - - - -
12f8b829 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Fix GHC.Internal.Prim haddock

Haddock used to parse Haskell source to generate documentation,
but switched to using interface files instead. This broke documentation
of the GHC.Internal.Prim module, since it's a wired-in interface that
didn't provide a document structure.

This patch adds the missing document structure and updates genprimopcode
to make the section headers and descriptions available.

fixes #26954

- - - - -
f87e5e57 by Luite Stegeman at 2026-03-07T05:03:33-05:00
Remove obsolete --make-haskell-source from genprimopcode

Now that haddock uses the wired-in interface for GHC.Internal.Prim,
the generated Haskell source file is no longer needed. Remove the
--make-haskell-source code generator from genprimopcode and replace
the generated GHC/Internal/Prim.hs with a minimal static source file.

- - - - -
4a7ddc7b by Sylvain Henry at 2026-03-07T05:04:59-05:00
JS: fix linking of exposed but non-preload units (#24886)

Units exposed in the unit database but not explicitly passed on the
command-line were not considered by the JS linker. This isn't an issue
for cabal which passes every unit explicitly but it is an issue when
using GHC directly (cf T24886 test).

- - - - -
689aafcd by mangoiv at 2026-03-07T05:05:52-05:00
testsuite: double foundation timeout multiplier

The runtime timeout in the foundation test was regularly hit by code
generated by the wasm backend - we increase the timout since the high
runtime is expected on the wasm backend for this rather complex test.

Resolves #26938

- - - - -
a46a1bb1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: add myCapabilityExpr to GHC.Cmm.Utils

This commit adds `myCapabilityExpr` to `GHC.Cmm.Utils` which is
computed from `BaseReg`. It's convenient for codegen logic where one
needs to pass the current Capability's pointer.

- - - - -
4afc65b1 by Cheng Shao at 2026-03-09T04:50:30-04:00
compiler: lower tryPutMVar# into a ccall directly

This patch addresses an old TODO of `stg_tryPutMVarzh` by removing it
completely and making the compiler lower `tryPutMVar#` into a ccall to
`performTryPutMVar` directly, without landing into an intermediate C
or Cmm function. `performTryPutMVar` is promoted to a public RTS
function with default visibility, and the compiler lowering logic
takes into account the C ABI of `performTryPutMVar` and converts from
C Bool to primop's `Int#` result properly.

- - - - -
9e3d6a58 by Simon Hengel at 2026-03-09T04:51:15-04:00
Don't use #line in haddocks

This confuses the parser.  Haddock output is unaffected by this change.
(read: this still produces the same documentation)

- - - - -
f4e8fec2 by Wolfgang Jeltsch at 2026-03-09T04:52:01-04:00
Remove in-package dependencies on `GHC.Internal.System.IO`

This contribution eliminates all dependencies on
`GHC.Internal.System.IO` from within `ghc-internal`. It comprises the
following changes:

  * Make `GHC.Internal.Fingerprint` independent of I/O support
  * Tighten the dependencies of `GHC.Internal.Data.Version`
  * Tighten the dependencies of `GHC.Internal.TH.Monad`
  * Tighten the dependencies of `GHCi.Helpers`
  * Move some code that needs `System.IO` to `template-haskell`
  * Move the `GHC.ResponseFile` implementation into `base`
  * Move the `System.Exit` implementation into `base`
  * Move the `System.IO.OS` implementation into `base`

Metric Decrease:
    size_hello_artifact
    size_hello_artifact_gzip
    size_hello_unicode
    size_hello_unicode_gzip

- - - - -
91df4c82 by Sylvain Henry at 2026-03-09T04:53:20-04:00
T18832: fix Windows CI failure by dropping removeDirectoryRecursive

On Windows, open file handles prevent deletion. After killThread, the
closer thread may not have called hClose yet, causing removeDirectoryRecursive
to fail with "permission denied". The test harness cleans up the run
directory anyway, so the call is redundant.

- - - - -
d7fe9671 by Cheng Shao at 2026-03-09T04:54:04-04:00
compiler: fix redundant import in GHC.StgToJS.Object

This patch fixes a redundant import in GHC.StgToJS.Object that causes
a build failure when compiling head from 9.14 with validate flavours.
Fixes #26991.

- - - - -
0bfd29c3 by Cheng Shao at 2026-03-09T04:54:46-04:00
wasm: fix `Illegal foreign declaration` failure when ghci loads modules with JSFFI exports

This patch fixes a wasm ghci error when loading modules with JSFFI
exports; the `backendValidityOfCExport` check in `tcCheckFEType`
should only makes sense and should be performed when not checking the
JavaScript calling convention; otherwise, when the calling convention
is JavaScript, the codegen logic should be trusted to backends that
actually make use of it. Fixes #26998.

- - - - -
e659610c by Duncan Coutts at 2026-03-09T12:08:35-04:00
Apply NOINLINE pragmas to generated Typeable bindings

For context, see the existing Note [Grand plan for Typeable]
and the Note [NOINLINE on generated Typeable bindings] added in the
subsequent commit.

This is about reducing the number of exported top level names and
unfoldings, which reduces interface file sizes and reduces the number of
global/dynamic linker symbols.

Also accept the changed test output and metric decreases.

Tests that record the phase output for type checking or for simplifier
end up with different output: the generated bindings now have an
Inline [~] annotation, and many top level names are now local rather
than module-prefixed for export.

Also accept the numerous metric decreases in compile_time/bytes
allocated, and a few in compile_time/max_bytes_used.

There's also one instance of a decrease in runtime/max_bytes_used but
it's a ghci-way test and so presumably the reason is that it loads
smaller .hi files and/or links fewer symbols.

-------------------------
Metric Decrease:
    CoOpt_Singletons
    MultiLayerModulesTH_OneShot
    MultilineStringsPerf
    T10421
    T10547
    T12150
    T12227
    T12234
    T12425
    T13035
    T13056
    T13253
    T13253-spj
    T15304
    T15703
    T16875
    T17836b
    T17977b
    T18140
    T18223
    T18282
    T18304
    T18698a
    T18698b
    T18730
    T18923
    T20049
    T21839c
    T24471
    T24582
    T24984
    T3064
    T4029
    T5030
    T5642
    T5837
    T6048
    T9020
    T9198
    T9961
    TcPlugin_RewritePerf
    WWRec
    hard_hole_fits
    mhu-perf
-------------------------

- - - - -
67df5161 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Add documentation Note [NOINLINE on generated Typeable bindings]

and refer to it from the code and existing documentation.

- - - - -
c4ad6167 by Duncan Coutts at 2026-03-09T12:08:35-04:00
Switch existing note to "named wrinkle" style, (GPT1)..(GPT7)

GPT = Grand plan for Typeable

- - - - -
dc84f8e2 by Cheng Shao at 2026-03-09T12:09:21-04:00
ci: only build deb13 for validate pipeline aarch64-linux jobs

This patch drops the redundant aarch64-linux deb12 job from validate pipelines
and only keeps deb13; it's still built in nightly/release pipelines. Closes #27004.

- - - - -
23a50772 by Rajkumar Natarajan at 2026-03-10T14:11:37-04:00
chore: Merge GHC.Internal.TH.Quote into GHC.Internal.TH.Monad

Move the QuasiQuoter datatype from GHC.Internal.TH.Quote to
GHC.Internal.TH.Monad and delete the Quote module.

Update submodule template-haskell-quasiquoter to use the merged
upstream version that imports from the correct module.

Co-authored-by: Cursor <cursoragent@cursor.com>

- - - - -
a2bb6fc3 by Simon Jakobi at 2026-03-10T14:12:23-04:00
Add regression test for #16122

- - - - -
604e1180 by Cheng Shao at 2026-03-11T15:00:42-04:00
hadrian: remove the broken bench flavour

This patch removes the bench flavour from hadrian which has been
broken for years and not used for actual benchmarking (for which
`perf`/`release` is used instead). Closes #26825.

- - - - -
c3e64915 by Simon Jakobi at 2026-03-11T15:01:31-04:00
Add regression test for #18186

The original TypeInType language extension is replaced with
DataKinds+PolyKinds for compatibility.

Closes #18186.

- - - - -
664996c7 by Andreas Klebinger at 2026-03-11T15:02:16-04:00
Bump nofib submodule.

We accrued a number of nofib fixes we want to have here.

- - - - -
517cf64e by Simon Jakobi at 2026-03-11T15:03:03-04:00
Add regression test for #15907

Closes #15907.

- - - - -
fff362cf by Simon Jakobi at 2026-03-11T15:03:49-04:00
Ensure T14272 is run in optasm way

Closes #16539.

- - - - -
ec81ec2c by Simon Jakobi at 2026-03-11T15:03:49-04:00
Add regression test for #24632

Closes #24632.

- - - - -
cefec47b by Simon Jakobi at 2026-03-11T15:03:50-04:00
Fix module name of T9675: T6975 -> T9675

- - - - -
d3690ae8 by Andreas Klebinger at 2026-03-11T15:04:31-04:00
User guide: Clarify phase control on INLINEABLE[foo] pragmas.

Fixes #26851

- - - - -
e7054934 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12694

Closes #12694.

- - - - -
4756d9f6 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #16275

Closes #16275.

- - - - -
34b7e2c1 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14908

Closes #14908.

- - - - -
4243db3d by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #14151

Closes #14151.

- - - - -
0e9f1453 by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #12640

Closes #12640.

- - - - -
ae606c7f by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #15588

Closes #15588.

- - - - -
5a38ce4e by Simon Jakobi at 2026-03-11T15:05:16-04:00
Add regression test for #9445

Closes #9445.

- - - - -
d054b467 by Cheng Shao at 2026-03-11T15:05:59-04:00
compiler: implement string interning logic for BCONPtrFS

This patch adds a `FastStringEnv`-based cache of `MallocStrings`
requests to `Interp`, so that when we load bytecode with many
breakpoints that share the same module names & unit ids, we reuse the
allocated remote pointers instead of issuing duplicte `MallocStrings`
requests and bloating the C heap. Closes #26995.

- - - - -
b85a0293 by Simon Jakobi at 2026-03-11T15:06:41-04:00
Add perf test for #1216

Closes #1216.

- - - - -
cd7f7420 by Sylvain Henry at 2026-03-11T15:07:58-04:00
JS: check that tuple constructors are linked (#23709)

Test js-mk_tup was failing before because tuple constructors weren't
linked in. It's no longer an issue after the linker fixes.

- - - - -
d57f01a4 by Matthew Pickering at 2026-03-11T15:08:40-04:00
testsuite: Add test for foreign import prim with unboxed tuple return

This commit just adds a test that foreign import prim works with unboxed
sums.

- - - - -
23d111ce by Matthew Pickering at 2026-03-11T15:08:41-04:00
Return a valid pointer in advanceStackFrameLocationzh

When there is no next stack chunk, `advanceStackFrameLocationzh` used to
return NULL in the pointer-typed StackSnapshot# result slot.

Even though the caller treats that case as "no next frame", the result is
still materialized in a GC-visible pointer slot. If a GC observes the raw
NULL there, stack decoding can crash.

Fix this by ensuring the dead pointer slot contains a valid closure
pointer. Also make the optional result explicit by returning an unboxed
sum instead of a tuple with a separate tag.

Fixes #27009

- - - - -
4c58a3ae by Cheng Shao at 2026-03-11T15:09:22-04:00
hadrian: build profiled dynamic objects with -dynamic-too

This patch enables hadrian to build profiled dynamic objects with
`-dynamic-too`, addressing a build parallelism bottleneck in release
pipelines. Closes #27010.

- - - - -
870243e4 by Zubin Duggal at 2026-03-12T17:33:28+05:30
DmdAnal: Take stable unfoldings into account when determining argument demands

Previously, demand analysis only looked at the RHS to compute argument demands.
If the optimised RHS discarded uses of an argument that the stable unfolding
still needed, it would be incorrectly marked absent. Worker/wrapper would then
replace it with LitRubbish, and inlining the stable unfolding would use the
rubbish value, causing a segfault.

To fix, we introduce addUnfoldingDemands which analyses the stable unfolding
with dmdAnal and combines its DmdType with the RHS's via the new `maxDmdType`
which combines the demands of the stable unfolding with the rhs, so we can avoid
any situation where we give an absent demand to something which is still used
by the stable unfolding.

Fixes #26416.

- - - - -
669d09f9 by Cheng Shao at 2026-03-13T15:06:07-04:00
hadrian: remove redundant library/rts ways definitions from stock flavours

This patch removes redundant library/rts ways definitions from stock
flavours in hadrian; they can be replaced by applying appropriate
filters on `defaultFlavour`.

- - - - -
a27dc081 by Teo Camarasu at 2026-03-13T15:06:51-04:00
ghc-internal: move bits Weak of finalizer interface to base

We move parts of the Weak finalizer interface to `base` only the parts
that the RTS needs to know about are kept in `ghc-internal`.

This lets us then prune our imports somewhat and get rid of some SOURCE imports.

Resolves #26985

- - - - -
6eef855b by Sylvain Henry at 2026-03-13T15:08:18-04:00
Stg/Unarise: constant-folding during unarisation (#25650)

When building an unboxed sum from a literal argument, mkUbxSum
previously emitted a runtime cast via `case primop [lit] of var -> ...`.
This wrapper prevented GHC from recognising the result as a static
StgRhsCon, causing top-level closures to be allocated as thunks instead
of being statically allocated.

Fix: try to perform the numeric literal cast at compile time using
mkLitNumberWrap (wrapping semantics). If successful, return the cast
literal directly with an identity wrapper (no case expression). The
runtime cast path is kept as fallback for non-literal arguments.

Test: codeGen/should_compile/T25650

- - - - -
905f8723 by Simon Jakobi at 2026-03-13T15:09:09-04:00
Add regression test for #2057

Test that GHC stops after an interface-file error instead of
continuing into the linker.

The test constructs a stale package dependency on purpose. `pkgB` is compiled
against one version of package `A`, then the same unit id is replaced by an
incompatible build of `A`. When `Main` imports `B`, GHC has to read `B.hi`,
finds an unfolding that still mentions the old `A`, and should fail while
loading interfaces.

Closes #2057.

Assisted-by: Codex

- - - - -
a13245a9 by Sylvain Henry at 2026-03-13T15:10:06-04:00
JS: fix recompilation avoidance (#23013)

- we were checking the mtime of the *.jsexe directory, not of a file
- we were not computing the PkgsLoaded at all

- - - - -
07442653 by Cheng Shao at 2026-03-13T15:10:51-04:00
hadrian: bump index state & bootstrap plans

This patch bumps hadrian index state & bootstrap plans:

- The updated index state allows bootstrapping from 9.14 without cabal
  allow-newer hacks
- The updated bootstrap plans all contain shake-0.19.9 containing
  important bugfix, allowing a subsequent patch to bump shake bound to
  ensure the bugfix is included
- ghc 9.14.1 bootstrap plan is added

- - - - -
fdc1dbad by Cheng Shao at 2026-03-13T15:10:51-04:00
ci: add ghc 9.14.1 to bootstrap matrix

This patch adds ghc 9.14.1 to bootstrap matrix, so that we test
bootstrapping from ghc 9.14.1.

- - - - -
91916079 by Sylvain Henry at 2026-03-13T15:11:43-04:00
T17912: wait for opener thread to block before killing it (#24739)

Instead of a fixed 1000ms delay, poll threadStatus until the opener
thread is in BlockedOnForeignCall, ensuring killThread only fires once
the thread is provably inside the blocking open() syscall. This prevents
the test from accidentally passing on Windows due to scheduling races.

- - - - -
baa4ebb4 by Cheng Shao at 2026-03-13T15:12:26-04:00
template-haskell: fix redundant import in Language.Haskell.TH.Quote

This patch fixes a redundant import in `Language.Haskell.TH.Quote`
that causes a ghc build failure when bootstrapping from 9.14 with
validate flavours. Fixes #27014.

- - - - -
02e68a86 by Brandon Simmons at 2026-03-13T15:13:19-04:00
Add a cumulative gc_sync_elapsed_ns counter to GHC.Internal.Stats

This makes it possible to get an accurate view of time spent in sync
phase when using prometheus-style sampling. Previously this was only
available for the most recent GC.

This intentionally leaves GHC.Stats API unchanged since it is marked as
deprecated, and API changes there require CLC approval.

Fixes #26944

- - - - -
a18fa3c1 by Cheng Shao at 2026-03-14T05:12:14-04:00
configure: make $LLVMAS default to $CC when $CcLlvmBackend is YES

This patch changes the $LLVMAS detection logic in configure so that
when it's not manually specified by the user, it defaults to $CC if
$CcLlvmBackend is YES. It's a more sensible default than auto-detected
clang from the environment, especially when cross-compiling, $CC as
the cross target's LLVM assembler is more compatible with the use case
than the system-wide clang. Fixes #26769.

- - - - -
3774086e by Matthew Pickering at 2026-03-14T05:13:00-04:00
exceptions: annotate onException continuation with WhileHandling

Before this patch, an exception thrown in the `onException` handler
would loose track of where the original exception was thrown.

```
import Control.Exception

main :: IO ()
main = failingAction `onException` failingCleanup
  where
    failingAction = throwIO (ErrorCall "outer failure")
    failingCleanup = throwIO (ErrorCall "cleanup failure")
```

would report

```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:

cleanup failure

HasCallStack backtrace:
  throwIO, called at T28399.hs:<line>:<column> in <package-id>:Main
```

notice that the "outer failure" exception is not present in the error
message.

With this patch, any exception thrown is in the handler is annotated
with WhileHandling. The resulting message looks like

```
T28399: Uncaught exception ghc-internal:GHC.Internal.Exception.ErrorCall:

cleanup failure

While handling outer failure

HasCallStack backtrace:
  throwIO, called at T28399.hs:7:22 in main:Main
```

CLC Proposal: https://github.com/haskell/core-libraries-committee/issues/397

Fixes #26759

- - - - -
63ae8eb3 by Andreas Klebinger at 2026-03-14T05:13:43-04:00
Fix missing profiling header for origin_thunk frame.

Fixes #27007

- - - - -
213d2c0e by Cheng Shao at 2026-03-14T05:14:28-04:00
ci: fix ci-images revision

The current ci-images revision was a commit on the WIP branch of
https://gitlab.haskell.org/ghc/ci-images/-/merge_requests/183, and
it's not on the current ci-images master branch. This patch fixes the
image revision to use the current tip of ci-images master.

- - - - -
fc2b083f by Andreas Klebinger at 2026-03-14T05:15:14-04:00
Revert "hadrian/build-cabal: Better respect and utilize -j"

This reverts commit eab3dbba79650e6046efca79133b4c0a5257613d.

While it's neat this currently isn't well supported on all platforms.

It's time will come, but for now I'm reverting this to avoid issues for
users on slightly unconvential platforms.

This will be tracked at #26977.

- - - - -
12a706cf by Cheng Shao at 2026-03-14T16:37:54-04:00
base: fix redundant imports in GHC.Internal.Weak.Finalize

This patch fixes redundant imports in GHC.Internal.Weak.Finalize that
causes a regression in bootstrapping head from 9.14 with validate
flavours. Fixes #27026.

- - - - -
b5d39cad by Matthew Pickering at 2026-03-14T16:38:37-04:00
Use explicit syntax rather than pure

- - - - -
43638643 by Andreas Klebinger at 2026-03-15T18:15:48-04:00
Configure: Fix check for --target support in stage0 CC

The check FP_PROG_CC_LINKER_TARGET used $CC unconditionally to check for
--target support. However this fails for the stage0 config where the C
compiler used is not $CC but $CC_STAGE0.

Since we already pass the compiler under test into the macro I simply
changed it to use that instead.

Fixes #26999

- - - - -
18fd0df6 by Simon Hengel at 2026-03-15T18:16:33-04:00
Fix typo in recursive_do.rst
- - - - -
86bd9bfc by fendor at 2026-03-17T23:46:09-04:00
Introduce `-fimport-loaded-targets` GHCi flag

This new flag automatically adds all loaded targets to the GHCi session
by adding an `InteractiveImport` for the loaded targets.

By default, this flag is disabled, as it potentially increases memory-usage.

This interacts with the flag `-fno-load-initial-targets` as follows:

* If no module is loaded, no module is added as an interactive import.
* If a reload loads up to a module, all loaded modules are added as
  interactive imports.
* Unloading modules removes them from the interactive context.

Fixes #26866 by rendering the use of a `-ghci-script` to achieve the
same thing redundant.

- - - - -
e3d4c1bb by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Remove GHC.Internal.Data.Eq

It served no purpose other than being a re-export.

- - - - -
6f4f6cf0 by mniip at 2026-03-17T23:47:03-04:00
ghc-internal: Refine GHC.Internal.Base imports

Removed re-exports from GHC.Internal.Base. This reveals some modules
that don't actually use anything *defined* in GHC.Internal.Base, and
that can be pushed down a little in the import graph.

Replaced most imports of GHC.Internal.Base with non-wildcard imports
from modules where the identifiers are actually defined.

Part of #26834

Metric Decrease:
    T5321FD

- - - - -
7fb51f54 by mangoiv at 2026-03-17T23:48:00-04:00
ci: clone, don't copy when creating the cabal cache

Also removed WINDOWS_HOST variable detected via uname - we now just
check whether the CI job has windows in its name. This works because we
only ever care about it if the respective job is not a cross job. We
also statically detect darwin cross jobs in the same way. We only ever have
darwin -> darwin cross jobs so this is enough to detect the host
reliably.

- - - - -
f8817879 by mangoiv at 2026-03-17T23:48:44-04:00
ci: mark size_hello_artifact fragile on darwin x86

The size of the x86_64 hello artifact is not stable which results in flaky testruns.

Resolves #26814

- - - - -
e34cb6da by Adam Gundry at 2026-03-20T12:20:00-04:00
ghci: Mention active language edition in startup banner

Per GHC proposal 632, this makes the GHCi startup banner include
the active language edition, plus an indication of whether this
was the default (as opposed to being explicitly selected via an
option such as `-XGHC2024`). For example:

```
$ ghci
GHCi, version 9.14.1: https://www.haskell.org/ghc/  :? for help
Using default language edition: GHC2024
ghci>
```

Fixes #26037.

- - - - -
52c3e6ba by sheaf at 2026-03-20T12:21:09-04:00
Improve incomplete record selector warnings

This commit stops GHC from emitting spurious incomplete record selector
warnings for bare selectors/projections such as .fld

There are two places we currently emit incomplete record selector
warnings:

  1. In the desugarer, when we see a record selector or an occurrence
     of 'getField'. Here, we can use pattern matching information to
     ensure we don't give false positives.
  2. In the typechecker, which might sometimes give false positives but
     can emit warnings in cases that the pattern match checker would
     otherwise miss.

This is explained in Note [Detecting incomplete record selectors]
in GHC.HsToCore.Pmc.

Now, we obviously don't want to emit the same error twice, and generally
we prefer (1), as those messages contain fewer false positives. So we
suppress (2) when we are sure we are going to emit (1); the logic for
doing so is in GHC.Tc.Instance.Class.warnIncompleteRecSel,
and works by looking at the CtOrigin.

Now, the issue was that this logic handled explicit record selectors as
well as overloaded record field selectors such as "x.r" (which turns
into a simple GetFieldOrigin CtOrigin), but it didn't properly handle
record projectors like ".fld" or ".fld1.fld2" (which result in other
CtOrigins such as 'RecordFieldProjectionOrigin').

To solve this problem, we re-use the 'isHasFieldOrigin' introduced in
fbdc623a (slightly adjusted).

On the way, we also had to update the desugarer with special handling
for the 'ExpandedThingTc' case in 'ds_app', to make sure that
'ds_app_var' sees all the type arguments to 'getField' in order for it
to indeed emit warnings like in (1).

Fixes #26686

- - - - -
309d7e87 by Cheng Shao at 2026-03-20T12:21:53-04:00
rts: opportunistically grow the MutableByteArray# in-place in resizeMutableByteArray#

Following !15234, this patch improves `resizeMutableByteArray#` memory
efficiency by growing the `MutableByteArray#` in-place if possible,
addressing an old todo comment here. Also adds a new test case
`resizeMutableByteArrayInPlace` that stresses this behavior.

- - - - -
7d4ef162 by Matthew Craven at 2026-03-20T12:22:47-04:00
Change representation of floating point literals

This commit changes the representation of floating point literals
throughough the compiler, in particular in Core and Cmm.
The Rational type is deficient for this purpose, dealing poorly
with NaN, +/-Infinity, and negative zero. Instead, the new module
GHC.Types.Literal.Floating uses the host Float/Double type to represent
NaNs, infinities and negative zero. It also contains a Rational
constructor, for the benefit of -fexcess-precision.

Other changes:

  - Remove Note [negative zero] and related code
    This also removes the restrictions on constant-folding of division
    by zero, and should make any problems with NaN/Infinity more obvious.

  - Use -0.0 as the additive identity for Core constant folding rules
    for floating-point addition, fixing #21227.

  - Manual worker-wrapper for GHC.Float.rationalToDouble. This is
    intended to prevent the compiler's WW on this function from
    interfering with constant-folding. This change means that we now
    avoid allocating a box for the result of a 'realToFrac' call in
    T10359.

  - Combine floatDecodeOp and doubleDecodeOp.
    This change also fixes a bug in doubleDecodeOp wherein it
    would incorrectly produce an Int# instead of an Int64#
    literal for the mantissa component with 64-bit targets.

  - Use Float/Double for assembly immediates, and update the X86 and
    PowerPC backends to properly handle special values such as NaN and
    infinity.

  - Allow 'rational_to' to handle zero denominators, fixing a
    TODO in GHC.Core.Opt.ConstantFold.

Fixes #8364 #9811 #18897 #21227
Progress towards #26919

Metric Decrease:
    T10359

Co-authored-by: sheaf <sam.derbyshire@gmail.com>

-------------------------
Metric Decrease:
    T1969
    T5321FD
-------------------------

- - - - -
80e2dd4f by Zubin Duggal at 2026-03-20T12:23:33-04:00
compiler/ffi: Collapse void pointer chains in capi wrappers

New gcc/clang treat -Wincompatible-pointer-types as an error by
default. Since C only allows implicit conversion from void*, not void**,
capi wrappers for functions taking e.g. abstract** would fail to compile
when the Haskell type Ptr (Ptr Abstract) was naively translated to void**.

Collapse nested void pointers to a single void* when the pointee type
has no known C representation.

Fixes #26852

- - - - -
1c50bd7b by Luite Stegeman at 2026-03-20T12:24:37-04:00
Move some functions related to pointer tagging to a separate module

- - - - -
bfd7aafd by Luite Stegeman at 2026-03-20T12:24:37-04:00
Branchless unpacking for enumeration types

Change unpacking for enumeration types to go to Word8#/Word16#/Word#
directly instead of going through an intermediate unboxed sum. This
allows us to do a branchless conversion using DataToTag and TagToEnum.

Fixes #26970

- - - - -
72b20fc0 by Luite Stegeman at 2026-03-20T12:25:30-04:00
bytecode: Carefully SLIDE off the end of a stack chunk

The SLIDE bytecode instruction was not checking for stack chunk
boundaries and could corrupt the stack underflow frame, leading
to crashes.

We add a check to use safe writes if we cross the chunk boundary
and also handle stack underflow if Sp is advanced past the underflow
frame.

fix #27001

- - - - -
2e22b43c by Cheng Shao at 2026-03-20T12:26:14-04:00
ghci: serialize BCOByteArray buffer directly when possible

This patch changes the `Binary` instances of `BCOByteArray` to
directly serialize the underlying buffer when possible, while also
taking into account the issue of host-dependent `Word` width. See
added comments and amended `Note [BCOByteArray serialization]` for
detailed explanation. Closes #27020.

- - - - -
89d9ba37 by Sylvain Henry at 2026-03-20T12:27:34-04:00
JS: replace BigInt with Number arithmetic for 32/64-bit quot/rem (#23597)

Replace BigInt-based implementations of quotWord32, remWord32,
quotRemWord32, quotRem2Word32, quotWord64, remWord64, quotInt64, and
remInt64 with pure Number (double/integer) arithmetic to avoid the
overhead of BigInt promotion.

- - - - -
ae4ddd60 by Sylvain Henry at 2026-03-20T12:28:28-04:00
Core: add constant-folding rules for Addr# eq/ne (#18032)

- - - - -
3e767f98 by Matthew Pickering at 2026-03-20T12:29:11-04:00
Use OsPath rather than FilePath in Downsweep cache

This gets us one step closure to uniformly using `OsPath` in the
compiler.

- - - - -
2c57de29 by Cheng Shao at 2026-03-20T12:29:55-04:00
hadrian: fix ghc-in-ghci flavour stage0 shared libraries

This patch fixes missing stage0 shared libraries in hadrian
ghc-in-ghci flavour, which was accidentally dropped in
669d09f950a6e88b903d9fd8a7571531774d4d5d and resulted in a regression
in HLS support on linux/macos. Fixes #27057.

- - - - -
5b1be555 by Sylvain Henry at 2026-03-20T12:30:48-04:00
JS: install rts/Types.h header file (#27033)

It was an omission, making HsFFI.h not usable with GHC using the JS
backend.

- - - - -
b883f08f by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: don't compile RTS with -Winline

This patch removes `-Winline` from cflags when compiling the RTS,
given that:

1. It generates a huge pile of spam and hurts developer experience
2. Whether inlining happens is highly dependent on toolchains,
   flavours, etc, and it's not really an issue to fix if inlining
   doesn't happen; it's a hint to the C compiler anyway.

Fixes #27060.

- - - - -
333387d6 by Cheng Shao at 2026-03-20T12:31:33-04:00
hadrian: compile libffi-clib with -Wno-deprecated-declarations

This patch adds `-Wno-deprecated-declarations` to cflags of
`libffi-clib`, given that it produces noise at compile-time that
aren't really our issue to fix anyway, it's from vendored libffi
source code.

- - - - -
67c47771 by Rodrigo Mesquita at 2026-03-20T12:32:17-04:00
Expose decodeStackWithIpe from ghc-experimental

This decoding is useful to the debugger and it wasn't originally
exported as an oversight.

- - - - -
18513365 by Matthew Pickering at 2026-03-21T04:43:26-04:00
Add support for custom external interpreter commands

It can be useful for GHC API clients to implement their own external
interpreter commands.

For example, the debugger may want an efficient way to inspect the
stacks of the running threads in the external interpreter.

- - - - -
4636d906 by mangoiv at 2026-03-21T04:44:10-04:00
ci: remove obsolete fallback for old debian and ubuntu versions

- - - - -
2e3a2805 by mangoiv at 2026-03-21T04:44:10-04:00
ci: drop ubuntu 18 and 20

Ubuntu 18 EOL: May 2023
Ubuntu 20 EOL: May 2025

We should probably not make another major release supporting these platforms.

Also updates the generator script.

Resolves #25876

- - - - -
de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00
rts: fix -Wcompare-distinct-pointer-types errors

This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS
which should have been caught by the `validate` flavour but was
warnings in CI due to the recent `+werror` regression.

- - - - -
b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00
ghc-internal: fix unused imports

This commit fixes unused imports in `ghc-internal` which should have
been caught by the `validate` flavour but was warnings in CI due to
the recent `+werror` regression. Fixes #26987 #27059.

- - - - -
da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00
ghci: fix unused imports

This commit fixes unused imports in `ghci` which should have been
caught by the `validate` flavour but was warnings in CI due to the
recent `+werror` regression. Fixes #26987 #27059.

- - - - -
955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00
compiler: fix unused imports in GHC.Tc.Types.Origin

This commit fixes unused imports in `GHC.Tc.Types.Origin` which should
have been caught by the `validate` flavour but was warnings in CI due
to the recent `+werror` regression. Fixes #27059.

- - - - -
3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00
hadrian: fix missing +werror in validate flavour

This patch fixes missing `+werror` in validate flavour, which was an
oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066.

- - - - -
44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00
ci: bump CACHE_REV and add the missing reminder

This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI
errors due to stale cabal cache on some runners, and also adds a
reminder to remind future maintainers. Fixes #27075.

- - - - -
2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
Add 128-bit SIMD support to AArch64 NCG

Changes:

- Add `Format` field to vector-capable instructions.
  These instructions will emit `vN.4s` (for example) as a operand.
- Additional constructors for `Operand`:
  `OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example).
  `OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example).
- Integer quot/rem are implemented in C, like x86.

Closes #26536

Metric Increase:
    T3294

- - - - -
5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00
AArch64 NCG: Improve code generation for floating-point and vector constants

Some floating-point constants can be directly encoded using the FMOV instruction.
Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI.

- - - - -
c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00
Add regression test for #13729

Closes #13729.

- - - - -
7d300443 by Wolfgang Jeltsch at 2026-03-23T23:28:59+02:00
Deprecate some `base` modules with stability risks 1 and 2

- - - - -

1285 changed files:

- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/darwin/nix/sources.json
- .gitlab/darwin/toolchain.nix
- + .gitlab/generate-ci/cabal.project
- .gitlab/generate-ci/flake.lock
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- compiler/CodeGen.Platform.h
- compiler/GHC/Builtin/Names.hs
- compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/Types.hs
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Builtin/primops.txt.pp
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/Linker.hs
- compiler/GHC/ByteCode/Serialize.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
- compiler/GHC/Cmm/Expr.hs
- compiler/GHC/Cmm/MachOp.hs
- compiler/GHC/Cmm/Node.hs
- compiler/GHC/Cmm/Opt.hs
- compiler/GHC/Cmm/Parser.y
- compiler/GHC/Cmm/Type.hs
- compiler/GHC/Cmm/Utils.hs
- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
- compiler/GHC/CmmToAsm/AArch64/Instr.hs
- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/AArch64/Regs.hs
- compiler/GHC/CmmToAsm/Config.hs
- compiler/GHC/CmmToAsm/LA64/CodeGen.hs
- compiler/GHC/CmmToAsm/LA64/Ppr.hs
- compiler/GHC/CmmToAsm/LA64/Regs.hs
- compiler/GHC/CmmToAsm/PPC/CodeGen.hs
- compiler/GHC/CmmToAsm/PPC/Ppr.hs
- compiler/GHC/CmmToAsm/PPC/Regs.hs
- compiler/GHC/CmmToAsm/RV64/CodeGen.hs
- compiler/GHC/CmmToAsm/RV64/Ppr.hs
- compiler/GHC/CmmToAsm/RV64/Regs.hs
- compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs
- compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
- compiler/GHC/CmmToAsm/X86/CodeGen.hs
- compiler/GHC/CmmToAsm/X86/Instr.hs
- compiler/GHC/CmmToAsm/X86/Ppr.hs
- compiler/GHC/CmmToAsm/X86/Regs.hs
- compiler/GHC/CmmToC.hs
- compiler/GHC/CmmToLlvm/CodeGen.hs
- compiler/GHC/CmmToLlvm/Data.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/InstEnv.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Map/Type.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/FloatIn.hs
- compiler/GHC/Core/Opt/FloatOut.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/Pipeline.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/WorkWrap.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/SimpleOpt.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/TyCon/RecWalk.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/AddImplicitBinds.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/Maybe.hs
- compiler/GHC/Data/Pair.hs
- compiler/GHC/Driver/Config/CmmToAsm.hs
- compiler/GHC/Driver/Config/Core/Lint.hs
- compiler/GHC/Driver/Config/Interpreter.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Main.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Hs/Binds.hs
- compiler/GHC/Hs/Decls.hs
- + compiler/GHC/Hs/Decls/Overlap.hs
- compiler/GHC/Hs/Doc.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.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/Decl.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Utils.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/GuardedRHSs.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Utils.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Linker/Dynamic.hs
- compiler/GHC/Linker/Loader.hs
- compiler/GHC/Linker/MacOS.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Parser/String.hs
- + compiler/GHC/Platform/Tag.hs
- compiler/GHC/Rename/Bind.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/HsType.hs
- + compiler/GHC/Rename/Lit.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Splice.hs-boot
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Interpreter/Init.hs
- compiler/GHC/Runtime/Interpreter/JS.hs
- compiler/GHC/Runtime/Interpreter/Types.hs
- compiler/GHC/Runtime/Interpreter/Wasm.hs
- compiler/GHC/Stg/Pipeline.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Closure.hs
- compiler/GHC/StgToCmm/Expr.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Literal.hs
- compiler/GHC/StgToJS/Object.hs
- compiler/GHC/StgToJS/Prim.hs
- compiler/GHC/SysTools/Cpp.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Foreign.hs
- compiler/GHC/Tc/Gen/Head.hs
- compiler/GHC/Tc/Gen/HsType.hs
- compiler/GHC/Tc/Gen/Match.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/Gen/Sig.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/Family.hs
- compiler/GHC/Tc/Instance/Typeable.hs
- compiler/GHC/Tc/Module.hs
- compiler/GHC/Tc/Solver.hs
- compiler/GHC/Tc/Solver/Default.hs
- compiler/GHC/Tc/Solver/Dict.hs
- compiler/GHC/Tc/Solver/Equality.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Solve.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/BasicTypes.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/CtLoc.hs
- compiler/GHC/Tc/Types/ErrCtxt.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/Origin.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/TcMType.hs-boot
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Zonk/TcType.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/Demand.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/Id/Info.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/InlinePragma.hs
- compiler/GHC/Types/Literal.hs
- + compiler/GHC/Types/Literal/Floating.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/SourceText.hs
- compiler/GHC/Types/Tickish.hs
- compiler/GHC/Types/Unique/DSet.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Unit/Module/ModIface.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Binary.hs
- compiler/GHC/Utils/Error.hs
- compiler/GHC/Utils/Monad.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/GHC/Utils/Ppr/Colour.hs
- compiler/GHC/Utils/Trace.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- + compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- + compiler/Language/Haskell/Syntax/Decls/Overlap.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/Lit.hs
- compiler/Language/Haskell/Syntax/Pat.hs
- compiler/Language/Haskell/Syntax/Type.hs
- compiler/ghc.cabal.in
- configure.ac
- distrib/configure.ac.in
- + docs/users_guide/10.0.1-notes.rst
- docs/users_guide/9.16.1-notes.rst
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/exts/explicit_namespaces.rst
- docs/users_guide/exts/multiway_if.rst
- docs/users_guide/exts/pragmas.rst
- + docs/users_guide/exts/qualified_strings.rst
- docs/users_guide/exts/recursive_do.rst
- docs/users_guide/exts/rewrite_rules.rst
- docs/users_guide/exts/roles.rst
- docs/users_guide/ghci.rst
- docs/users_guide/phases.rst
- docs/users_guide/rtd-theme/layout.html
- docs/users_guide/using-optimisation.rst
- docs/users_guide/using.rst
- docs/users_guide/utils.py
- docs/users_guide/wasm.rst
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Info.hs
- ghc/Main.hs
- hadrian/README.md
- hadrian/bootstrap/generate_bootstrap_plans
- hadrian/bootstrap/plan-9_10_1.json
- hadrian/bootstrap/plan-9_10_2.json
- + hadrian/bootstrap/plan-9_10_3.json
- hadrian/bootstrap/plan-9_12_1.json
- hadrian/bootstrap/plan-9_12_2.json
- + hadrian/bootstrap/plan-9_14_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_1.json
- hadrian/bootstrap/plan-bootstrap-9_10_2.json
- + hadrian/bootstrap/plan-bootstrap-9_10_3.json
- hadrian/bootstrap/plan-bootstrap-9_12_1.json
- hadrian/bootstrap/plan-bootstrap-9_12_2.json
- + hadrian/bootstrap/plan-bootstrap-9_14_1.json
- hadrian/cabal.project
- hadrian/doc/flavours.md
- hadrian/hadrian.cabal
- hadrian/src/Builder.hs
- hadrian/src/CommandLine.hs
- hadrian/src/Context.hs
- hadrian/src/Main.hs
- hadrian/src/Rules/Compile.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Settings.hs
- hadrian/src/Settings/Builders/Cc.hs
- hadrian/src/Settings/Builders/Configure.hs
- hadrian/src/Settings/Builders/GenPrimopCode.hs
- hadrian/src/Settings/Builders/Ghc.hs
- hadrian/src/Settings/Builders/Make.hs
- hadrian/src/Settings/Builders/RunTest.hs
- − hadrian/src/Settings/Flavours/Benchmark.hs
- hadrian/src/Settings/Flavours/Development.hs
- hadrian/src/Settings/Flavours/GhcInGhci.hs
- hadrian/src/Settings/Flavours/Quick.hs
- hadrian/src/Settings/Flavours/QuickCross.hs
- hadrian/src/Settings/Flavours/Quickest.hs
- hadrian/src/Settings/Flavours/Validate.hs
- hadrian/src/Settings/Packages.hs
- libraries/Cabal
- libraries/base/base.cabal.in
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Arrow.hs
- libraries/base/src/Data/Bool.hs
- libraries/base/src/Data/Char.hs
- libraries/base/src/Data/Eq.hs
- libraries/base/src/Data/Ix.hs
- libraries/base/src/Data/List.hs
- libraries/base/src/Data/List/NubOrdSet.hs
- libraries/base/src/Data/Semigroup.hs
- libraries/base/src/GHC/Arr.hs
- libraries/base/src/GHC/ArrayArray.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/Conc/IO.hs
- − libraries/base/src/GHC/Desugar.hs
- libraries/base/src/GHC/Encoding/UTF8.hs
- libraries/base/src/GHC/Exception.hs
- libraries/base/src/GHC/Exception/Type.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/Fingerprint/Type.hs
- libraries/base/src/GHC/IO/Buffer.hs
- libraries/base/src/GHC/IO/Device.hs
- libraries/base/src/GHC/IO/Encoding.hs
- libraries/base/src/GHC/IO/Exception.hs
- libraries/base/src/GHC/IO/Handle/Text.hs
- libraries/base/src/GHC/InfoProv.hs
- libraries/base/src/GHC/ResponseFile.hs
- libraries/base/src/GHC/Stack/Types.hs
- libraries/base/src/GHC/Stats.hs
- libraries/base/src/GHC/TopHandler.hs
- libraries/base/src/GHC/Unicode.hs
- libraries/base/src/GHC/Weak.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/Prelude.hs
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/c7493f8e63444d07166f66f5a41c050...

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[Git][ghc/ghc][wip/jeltsch/stability-risk-1-and-2-module-deprecation] 200 commits: ci: remove duplicate keys in .gitlab-ci.yml

Wolfgang Jeltsch (＠jeltsch)