[Git][ghc/ghc][wip/sjakobi/T24813] 217 commits: CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent

6 Sep 2026

      Simon Jakobi pushed to branch wip/sjakobi/T24813 at Glasgow Haskell Compiler / GHC

Commits:
9b714c4c by Zubin Duggal at 2026-07-05T09:40:36+05:30
CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent

In #25924, we segfault because speculation forces a projection out of a RUBBISH dictionary
(which we generated because it absent).

Solution: Don't speculate on bindings we already know are absent.

Fixes 25924

- - - - -
4a59b3ee by Zubin Duggal at 2026-07-05T09:40:36+05:30
Don't make absent fillers for terminating types

In #25924 we discovered that we could speculatively evaluate an absent filler
for a dictionary, and project a field (a superclass selector) out of it,
resulting in segfaults.

Solution: Never make an absent filler or rubbish literal for a terminating type
like a dictionary. mkAbsentFiller returns Nothing for isTerminatingType, so
worker/wrapper and the specialiser keep the real argument instead.

Some small metric decreases because we do a little less work in the
simplifier now.

Metric Decrease:
    T9872a
    T9872b
    T9872c
    TcPlugin_RewritePerf

- - - - -
383ddcd4 by Alan Zimmerman at 2026-07-06T07:08:16-04:00
EPA: Move the 'where' annotation for PatSynBind

This allows us to move it out of the MatchGroup exact print annotation
too

- - - - -
66d1a5d5 by fendor at 2026-07-07T16:57:56-04:00
Add 'backendInfoTableMapValidity' backend predicate

Check whether the backend supports the `-finfo-table-map` flag and
ignore it otherwise.

Improve by-design documentation of `backendCodeOutput`.

`Backend` is **abstract by design**. Make this clearer in
`backendCodeOutput` which is incorrectly being used as a proxy for
`Backend`.

Instead, define the desired property predicates in GHC.Driver.Backend
In the process, make `backendCodeOutput` total.

- - - - -
74f1071d by fendor at 2026-07-07T16:57:56-04:00
Add failing test for `-finfo-table-map` and bytecode backend

If you compile a module using the bytecode backend, with
-finfo-table-map, then the info table map doesn't get populated for the
module.

This is because the -finfo-table-map code path is implemented mostly in
the StgToCmm phase which isn't run when creating bytecode.

Ticket #27039

- - - - -
28d63bca by mangoiv at 2026-07-07T16:59:16-04:00
ci: don't fail nightly if there have been no changes that night

Fixes #27127

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4ebfc478 by Rodrigo Mesquita at 2026-07-08T04:47:53-04:00
ttg: Using ShortText over FastString in the AST

To make the AST independent of GHC, this commit replaces usages of
`FastString` with `HText` in the AST, killing the last edge from
Language.Haskell.* to GHC.* modules.

Even though we /do/ want to use FastStrings in general -- critically in
Names or Ids -- there is no particular reason for the FastStrings that
occur in the AST proper to be FastStrings. Strings in the AST are
typically unique and don't benefit particularly from being interned
FastStrings with Uniques for fast comparison.

`HText` is a type synonym for `ShortText` which uses GHC's Modified
UTF-8 encoding exclusively.

Modified UTF-8 must be used to represent the Haskell AST because the
Haskell Report allows surrogate code points. `Data.Text.Text` functions
use Standard UTF-8 which replace surrogates with a placeholder value,
thus `Data.Text.Text` is unsuitable for AST strings. See the
`Language.Haskell.Syntax.Text` module header for more details.

Final progress towards #21592

Closes #21628

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d910b353 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00
Update equality-type documenation in GHC.Builtin.Types.Prim

Fix #27466

- - - - -
b2530542 by Simon Peyton Jones at 2026-07-08T04:48:36-04:00
Honour -dsuppress-coercions in GHC.Core.TyCo.pprCo

Fixes #27467

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9a73179a by Facundo Domínguez at 2026-07-08T04:49:26-04:00
Add item to MR checklist asking to squash fixup commits after approval

The checklist has an item that reads

    All commits are either individually buildable or squashed.

This item could be checked immediately after sending the merge request
though. If reviewers ask for amends later on, and the author amends
the merge request, there was no item that would remind the contributors
to squash the fixup commits before landing.

This commit adds a new item

    After all approvals and before landing: all fixup commits are squashed with their originating commits.

which should be harder to mark as done before approvals have been given.

- - - - -
ed09895d by Andreas Klebinger at 2026-07-08T16:53:27-04:00
Fix a profiling race condition resulting in segfaults.

StgToCmm: Don't assume tagged FUN closures in closureCodeBody.
When entering a closure the self/node pointer might not be tagged in
some situations when a thunk is evaluated by multiple threads.
So we most AND away the tag bits rather than subtracting an expected tag.

Apply.cmm: Fix a race condition occuring when a thunk is mutated during GC.

In stg_ap_0_fast when might need to run GC before entering a thunk. If this happens
another thread or the GC itself might mutate the closure making entering it no longer
valid. We now check for this.

Add test and changelog for #27123 fixes.

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67c03eb2 by Cheng Shao at 2026-07-08T16:54:09-04:00
ghc-heap: fix invalid srtlen returned by peekItbl when no-TNTC

This patch fixes the no-TNTC code path of `peekItbl` so that it looks
at the right memory address when reading the `srt` field from the
`StgInfoTable_` struct. Also adds a `T27465` regression test that
reproduces the bug on no-TNTC builds before the fix. Fixes #27465.

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

- - - - -
2ecabb4f by Zubin Duggal at 2026-07-09T09:23:25-04:00
hadrian: binary-dist-dir should not be the default target

Revert behaviour to pre 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2

In 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2, we applied the following behaviour change:

```
hadrian: Build stage 2 cross compilers
...
* hadrian: Make binary-dist-dir the default build target. This allows us
  to have the logic in one place about which libraries/stages to build
  with cross compilers. Fixes #24192
```

This is a major regression to development experience, a plain hadrian/build
--freeze1 now takes ages because we rebuild all docs (which need to go in the
binary dist dir).

`binary-dist-dir` is the wrong default target for regular GHC development work

Fixes #27445

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e16388e3 by Zubin Duggal at 2026-07-09T09:23:25-04:00
.gitignore: Add the hadrian system.config introduced by commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2

Since

commit 23c9b6c392f52ec9d7a8618b204ff6b885f5fba2
Author: Matthew Pickering <matthewtpickering@gmail.com>
Date:   Thu Dec 21 16:17:41 2023 +0000

    hadrian: Build stage 2 cross compilers

./configure produces /hadrian/cfg/system.config.{host,target}

Add these to .gitignore

- - - - -
7e8abf41 by Alan Zimmerman at 2026-07-09T09:24:12-04:00
EPA: Replace AnnListItem with simply [TrailingAnn]

Remove the unnecessary wrapper around a single field.

- - - - -
29032f17 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Keep real reason for fragile test failures

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c34e03a7 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Fall back to the failure reason for empty JUnit bodies

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409d40f0 by Zubin Duggal at 2026-07-09T09:24:58-04:00
testsuite: Show output diffs in JUnit output

Also refactor compare_outputs to return essentially a `Maybe Diff`
(`CompareOutput`) instead of a bool, but more pythonic. This
allows us to pass the diff through nice.

- - - - -
06fee1ab by Zubin Duggal at 2026-07-09T09:24:58-04:00
perf notes: include stat deviation and acceptance window in notes so they show up in gitlab

- - - - -
57c0f32c by mangoiv at 2026-07-10T11:08:38-04:00
driver: enable -finter-module-far-jumps by default

this fixes a compatibility bug with certain binutils/gcc versions where
we were seeing jump offset overflow errors.
This commit can probably reverted if we stop supporting the problematic
binutils/gcc verions (2.44 and 14.2, respectively)

Reolves #26994

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4396a6f2 by Andrea Vezzosi at 2026-07-10T11:09:25-04:00
[Fix #27287] preserve ModBreaks in ModIface

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ed261a7e by Cheng Shao at 2026-07-14T17:59:38-04:00
hadrian: fix HLS support

This patch fixes hadrian's HLS support so one can rely on HLS when
working on the hadrian codebase. Fixes #27480.

Not building/linking shared libraries for hadrian is a severely
premature optimization; this top-level setting in `cabal.project` only
affects home packages while the dependencies in the cabal store are
built with vanilla/dynamic anyway, and even adding dynamic builds to
home packages would not be costly due to cabal's usage of
`-dynamic-too`.

- - - - -
eee8ec5b by Cheng Shao at 2026-07-14T18:00:20-04:00
compiler: fix miscompiled %load_relaxed, add missing %store_relaxed

This patch fixes the %load_relaxed cmm primop compilation logic to
correctly use relaxed memory ordering, and adds the missing
%store_relaxed primop. Parsing logic of %load/%store with explicit
ordering is covered in the AtomicFetch test case. Fixes #27483.

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

- - - - -
1718230f by Alan Zimmerman at 2026-07-14T18:01:06-04:00
EPA: Keep binds and sigs together in HsValBindsLR

We combine them into a single list for GhcPs, wrapped in the
ValBind data type, which is the bind equivalent of ValD, having
constructors for binds and sigs.

This simplifies exact print processing, especially when using it to
update the contents of local binds, as we no longer need AnnSortKey
BindTag

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6bd1ad2a by Andreas Klebinger at 2026-07-14T18:01:49-04:00
Bump nofib submodule to account for MonoLocalBinds.

New versions of GHC enable MonoLocalBinds by default.
This breaks some of the benchmarks. I've fixed this and
this bump pulls in that fix.

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7eb0f1c9 by Cheng Shao at 2026-07-14T18:02:31-04:00
testsuite: fix bytecodeIPE test under +ipe flavours

This patch fixes the bytecodeIPE test under +ipe flavours. It used to
fail under +ipe because the RTS is built with IPE info, then
stg_AP_info in RTS carries IPE info, so whereFrom wouldn't return
Nothing. Now the test checks IPE info of a datacon in the ghci-loaded
module which is not affected by whether the RTS is built with IPE info
or not. Fixes #27498.

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

- - - - -
ef038aae by cydparser at 2026-07-15T04:35:41-04:00
Reduce bytes allocated for `capabilities` in RTS (fixes #27487)

In rts/Capability.c, `capabilities` is an array of pointers, but it was allocated as if it were an
array of Capability's.

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d377e83e by Cheng Shao at 2026-07-15T04:36:27-04:00
rts: fix missing UNTAG in stg_readTVarIOzh

This patch fixes missing UNTAG on the current value closure read from
StgTVar. UNTAG is a no-op when it's stg_TREC_HEADER_info which is word
aligned; it may be a tagged closure, and reading info table from the
tagged address is an unaligned load which may cause issues on
platforms with strict alignment requirements.

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

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8ed03842 by Cheng Shao at 2026-07-15T04:36:27-04:00
rts: fix missing UNTAG in stg_control0zh_ll

This patch fixes missing UNTAG on the cont closure returned by
captureContinuationAndAbort. In case it's not NULL,
captureContinuationAndAbort returns a tagged StgContinuation closure,
in which case it must be untagged before accessing the
apply_mask_frame field.

In the past it worked out of luck: when apply_mask_frame was NULL then
mask_frame_offset is also 0 so the control flow didn't diverge to a
wrong path. Still, this is horribly wrong and will crash once
StgContinuation struct is refactored and fields are shuffled around.

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

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5aa7000a by Cheng Shao at 2026-07-15T04:37:08-04:00
compiler: fix redundant AP thunk codegen when not using -ticky-ap-thunk

This patch fixes a double negation confusion in !7525 that results in
some redundant AP thunk code generation when not using
-ticky-ap-thunk. Now, we use `stgToCmmUseStdApThunk` to indicate
whether precomputed AP thunks in the RTS should be used, which
defaults to `True`, unless `-ticky-ap-thunk` is passed.
`-finfo-table-map` now also implies `-ticky-ap-thunk`, since when
doing IPE profiling we want the generated AP thunks to be unique.
Fixes #27502.

-------------------------
Metric Decrease:
    T3064
-------------------------

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

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d43a7b7a by Brian McKenna at 2026-07-15T20:10:04+02:00
Strip ticks when desugaring bool guards

The special `considerAccessible` pattern was broken when compiling
with debug info. Compiling with debug info wraps expressions with
`SourceNote` ticks, which broke the internals of the
`desugarBoolGuard` function. Ticks are now ignored within this
function.

Fixes #27360

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ede4b17b by Ben Gamari at 2026-07-15T22:59:53-04:00
base: Display ExceptionContext in WhileHandling's textual description

As originally-implemented the implementation for
`WhileHandling(displayExceptionAnnotation)` would display the
`ExceptionContext` of the exception which it carries (as this was the
behavior of `displayException`, in terms of which
`displayExceptionAnnotation` was implemented).

However, in 284ffab3 the definition of `SomeException(displayException)`
was changed to exclude the `ExceptionContext`. This means that
`WhileHandling(displayExceptionAnnotation)` fails to describe the
provenance of the exception which it captures, greatly limiting its
utility.

Return the implementation to its originally-specified behavior by
implementing `WhileHandling(displayExceptionAnnotation)` in terms of
`displayExceptionWithInfo`.

Fixes #27456.

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0f64f348 by Cheng Shao at 2026-07-16T15:41:08+00:00
ci: add missing docker permission workaround in abi-test job

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660cb239 by Cheng Shao at 2026-07-16T19:37:48+00:00
bindist: Fix make install -j race condition on macos/freebsd

This patch fixes make install -j race condition on macos/freebsd. BSD
install fails with EEXIST when multiple install processes concurrently
create the same prefix directory. So we add an `install_dirs`
prerequisite job that sequentially creates the directories for
subsequent jobs to work with. Fixes #27499.

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

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08130257 by Cheng Shao at 2026-07-16T19:37:48+00:00
ci: run bindist make install with -j

This patch makes the ci scripts run `make install` with `-j` to reduce
wall clock time when installing the bindist, see related issue for
benchmark numbers. This only affects ghc ci logic, the user-facing
default is up to distributors and is still `-j1`. Closes #27029.

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d5ae6906 by Adam Gundry at 2026-07-17T04:57:43-04:00
Mark various language extension flags as deprecated (see #27329)

The following language extensions are now deprecated:

 - AlternativeLayoutRule
 - AlternativeLayoutRuleTransitional
 - ParallelArrays
 - PolymorphicComponents
 - Rank2Types

In addition, the warning `-Walternative-layout-rule-transitional`
has been marked as deprecated, as it is emitted only under the
deprecated extension `XAlternativeLayoutRuleTransitional`.

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fe3b059c by Andrew Lelechenko at 2026-07-17T04:58:26-04:00
base: re-export GHC.Environment.getFullArgs from System.Environment

CLC proposal https://github.com/haskell/core-libraries-committee/issues/431

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722236dd by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid double-Sym for InstCo

Ticket #27374 pointed out an issue with GHC.Core.Coercion.Opt.optCoercion's
handling of InstCo: it contravened (LC2) in Note [The LiftingContext in optCoercion]
because it applied the ambient 'sym' to a coercion that was then added
to the lifting context substitution.

Fixes #27374

Co-authored-by: Simon Jakobi <simon.jakobi@gmail.com>

- - - - -
ff70fc75 by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid exponential behaviour

The change to coercion optimisation of 'InstCo' in the previous commit
introduces exponential behaviour to the coercion optimiser. To avoid
this, this commit provides a way to push in 'Sym' of an already-optimised
coercion: GHC.Core.Coercion.Opt.mkDeepSymCo.

See Note [Pushing Sym without re-optimising] in GHC.Core.Coercion.Opt.

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dfef27f0 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Move THREADED_RTS-conditional struct members to end of Capability

Accessing members of the Capability struct from CMM code rely on
accessor macros. (The macros are generated by deriveConstants).

These macros have a single definition. This means that the offsets of
all struct members must *not* vary based on THREADED_RTS vs
!THREADED_RTS. This requires that any struct members that are
conditional on THREADED_RTS must occur after the unconditional struct
members. Hence we move all the ones that are conditional on
THREADED_RTS to the end.

Add a deriveConstants entry for the iomgr member of the Capability
struct, which was the motivation for this change.

Add warning messages to help our future selves. Debugging this took me
a couple hours in gdb!

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c254e022 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Make the IOManager API use CapIOManager rather than Capability

This makes the API somewhat more self-contained and more consistent.
Now the IOManager API and each of the backends takes just the I/O
manager structure. Previously we had a bit of a mixture, depending on
whether the function needed access to the Capability or just the
CapIOManager.

We still need access to the cap, so we introduce a back reference to
reach the capability, via iomgr->cap.

Convert all uses in select and poll backends, but not win32 ones.
Convert callers in the scheduler and elsewhere.

Also convert the three CMM primops that call IOManager APIs. They just
need to use Capability_iomgr(MyCapability()).

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4f3d8f31 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Split posix/MIO.c out of posix/Signals.c

The MIO I/O manager was secretly living inside the Signals file.

Now it gets its own file, like any other self-respecting I/O manager.

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52ce04a9 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rationalise some scheduler run queue utilities

Move them all to the same place in the file.

Make some static that were used only internally.

Also remove a redundant assignment after calling truncateRunQueue that
is already done within truncateRunQueue.

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75bbdebc by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rename initIOManager{AfterFork} to {re}startIOManager

These are more accurate names, since these actions happen after
initialisation and are really about starting (or restarting) background
threads.

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724c0517 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Free per-cap I/O managers during shutdown and forkProcess

Historically this was not strictly necessary. The select and win32
legacy I/O managers did not maintain any dynamically allocated
resources. The new poll one does (an auxillary table), and so this
should be freed.

After forkProcess, all threads get deleted. This includes threads
waiting on I/O or timers. So as of this patch, resetting the I/O
manager is just about tidying things up. For example, for the poll
I/O manager this will reset the size of the AIOP table (which
otherwise grows but never shrinks).

In future however the re-initialising will become neeecessary for
functionality, since some I/O managers will need to re-initialise
wakeup fds that are set CLOEXEC.

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c007d122 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a TODO to the MIO I/O manager

The direction of travel is to make I/O managers per-capability and have
all their state live in the struct CapIOManager. The MIO I/O manager
however still has a number of global variables.

It's not obvious how handle these globals however.

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b65ab7b3 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a FIXME note in the Poll I/O manager

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daf2bd6f by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add missing updateRemembSetPushClosure in poll I/O manager

For the non-moving GC.

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e33ca830 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvement to struct StgAsyncIOOp member outcome

Mention the enumeration names, as well as their numeric values. The rest
of the code uses the enum names.

- - - - -
4edd2579 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvements for StgTSOBlockInfo

Clarify that certain union members are used only by certain legacy
I/O managers. Hopefully we will be able to remove these at some point.

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536bedbb by Duncan Coutts at 2026-07-18T08:49:12-04:00
Avoid exporting various win32-specific rts symbols

The BeginPrivate.h / EndPrivate.h scheme works perfectly well on
Windows, but all of the rts/win32/*.h files were not using it.

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8139b5ac by Duncan Coutts at 2026-07-18T08:49:12-04:00
Remove wakeupIOManager, ioManagerWakeup and setIOManagerWakeupFd

We no longer need wakeupIOManager for the threaded RTS case, so we can
remove it and the bits only needed to support it. This includes the
pipe/eventfd fd shared between the RTS and the in-library I/O manager
used for waking up the I/O manager thread. The pipe/eventfd still
exists, but it no longer has to be communicated to the RTS, since the
RTS no longer needs to use it.

So we remove the RTS API export setIOManagerWakeupFd, and remove uses of
it within the I/O managers in ghc-internal.

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74fe7c66 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a new interruptIOManager API for the I/O managers

It will be used to interrupt awaitCompletedTimeoutsOrIO. Also update the
return type and docs for awaitCompletedTimeoutsOrIO to have it return
false when it gets interrupted, and have no useful post condition in
that case.

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38792843 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for select I/O manager

Uses the FdWakup mechanism.

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2f3b00aa by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for poll I/O manager

Uses the FdWakup mechanism.

A quirk we have to cope with is that we now need to poll one more fd --
the wakeup_fd_r -- but this fd has no corresponding entry in the
aiop_table. This is awkward since we have set up our aiop_poll_table to
be an auxilliary table with matching indicies.

The solution this patch uses (and described in the comments) is to have
two tables: struct pollfd *aiop_poll_table, *full_poll_table;
and to have the aiop_poll_table alias the tail of the full_poll_table.
The head entry in the full_poll_table is the extra fd. So we poll the
full_poll_table, while the aiop_poll_table still has matching indicies
with the aiop_table.

Hurrah for C aliasing rules.

- - - - -
cee50131 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for win32 legacy I/O manager

And remove unused related helper resetAbandonRequestWait. It is not
called because the event is created in auto-reset mode, so never needs
to be reset manually.

- - - - -
cf453143 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Note lack of interruptIOManager support for WinIO I/O manager

Though there's a plausible design, we can't sanely test it at the moment
due to related WinIO bugs. Filed as issue #27403.

- - - - -
1b74a0ad by Duncan Coutts at 2026-07-18T08:49:13-04:00
Be more explicit about enum IOReadOrWrite values, and type within cmm

Belt and braces.

- - - - -
b388d093 by Brian McKenna at 2026-07-18T17:51:50-04:00
Ignore ticks in the pattern-match term oracle

The term-oracle in the pattern-match checker is keyed by a canonical
form of the scrutinee, computed by `makeDictsCoherent`. That canonical
form was tick-sensitive: two occurrences of an otherwise identical
expression that happened to carry different ticks were treated as
distinct values, breaking long-distance information.

This shows up in practice under `-finfo-table-map`, because the
desugarer wraps every record-selector use site in a `SourceNote`
carrying that site's span. For example:

     data Box = Box { unBox :: Maybe Int }
     f b = case unBox b of
       Nothing -> 0
       Just _  -> let Just x = unBox b in x

The two `unBox b` expressionss carry different SourceNote spans, the
pattern-match checker sees them as different, the long-distance
information from the outer `Just _` branch never reaches the
let-pattern, and `Just x = unBox b` is wrongly reported as
non-exhaustive.

We now strip all ticks in `makeDictsCoherent`.  This is documented as
Wrinkle (UD1) of Note [Unique dictionaries in the TmOracle CoreMap].

Fixes #27314

- - - - -
c23e1acb by Mrjtjmn at 2026-07-18T17:52:45-04:00
Add explanations for unsolved Typeable constraints

This commit adds explanations for unsolved 'Typeable' constraints.

GHC will now provide additional explanations for an unsolved constraint
of the form 'Typeable ty', explain why GHC did not solve Typeable constraint.
e.g.:
 - 'ty' is a polymorphic type (e.g. forall a. a -> a)
 - 'ty' is a qualified type (e.g. Eq Int => Int)
 - 'ty' is an unboxed sum type
 - 'ty' is an unreduced type family application
 - 'ty' whose kind is not typeable

Fixes #26532

- - - - -
cbef021e by Artem Pelenitsyn at 2026-07-19T07:49:55-04:00
ghc-internal: Lock.hs: fix typo and indentation
- - - - -
42918646 by Duncan Coutts at 2026-07-19T07:50:36-04:00
Fix failing test GcStaticPointers for non-moving GC

Minor mistake in asserting something before checking for that same
thing.

Specifically, Bdescr asserts HEAP_ALLOCED_GC, but Bdescr was being used
prior to a guard that checks HEAP_ALLOCED_GC. The solution is just to
move the use of Bdescr after the guard.

Thanks to Simon Jakobi for identifying the problem.

- - - - -
c2f6dcd4 by Sasha Bogicevic at 2026-07-20T10:31:56+02:00
Improve error messages for invalid record wildcards

Record wildcard hints are now shown in more contexts and include
constructor arity; matching with `..` on a fieldless constructor
now produces a dedicated error message.

Fixes #21101

- - - - -
4c02e76b by Duncan Coutts at 2026-07-21T10:37:21-04:00
Mark test T27105 as fragile, citing issue #27522

Scheduler fairness is fine, except when it isn't. And it isn't on CI
machines surprisingly often! See the issue for details.

- - - - -
43dd2b15 by Recursion Ninja at 2026-07-21T17:09:53-04:00
Resolving many TTG related orphan type-class instances

This is part a technical debt removal effort made possible now
that separating out the AST via TTG has come to a close.

As the AST in 'L.H.S' has been incrementally separated from the GHC internals,
there are many accumulated orphan instance of 'Binary', 'NFData', 'Outputable',
and 'Uniquable'. The orphan instance of data-types from within 'L.H.S' have had
their orphan instances moved to either:
  1. The module which defines the data-type
  2. The module which defines the type-class;
     i.e. moving an orphan 'Binary' instance to 'GHC.Utils.Binary'

Orphan instances resolved (37):

  | Data-type            | Resolved instance(s)       | Former orphan module(s)   |
  | -------------------- | -------------------------- | ------------------------- |
  | Role                 | Binary, NFData, Outputable | GHC.Core.Coercion.Axiom   |
  | SrcStrictness        | Binary, NFData, Outputable | GHC.Core.DataCon          |
  | SrcUnpackedness      | Binary, NFData, Outputable | GHC.Core.DataCon          |
  | Fixity               | Binary, Outputable         | GHC.Hs.Basic              |
  | FixityDirection      | Binary, Outputable         | GHC.Hs.Basic              |
  | LexicalFixity        | Outputable                 | GHC.Hs.Basic              |
  | CCallTarget          | NFData                     | GHC.Hs.Decls.Foreign      |
  | CType                | NFData                     | GHC.Hs.Decls.Foreign      |
  | Header               | NFData                     | GHC.Hs.Decls.Foreign      |
  | OverlapMode          | Binary, NFData             | GHC.Hs.Decls.Overlap      |
  | WithHsDocIdentifiers | NFData, Outputable         | GHC.Hs.Doc                |
  | HsDocString          | NFData                     | GHC.Hs.DocString          |
  | HsDocStringChunk     | Binary, Outputable         | GHC.Hs.DocString          |
  | HsDocStringDecorator | Binary, Outputable         | GHC.Hs.DocString          |
  | NamespaceSpecifier   | Outputable                 | GHC.Hs.ImpExp             |
  | ForAllTyFlag         | Binary, NFData, Outputable | GHC.Hs.Specificity        |
  | Specificity          | Binary, NFData             | GHC.Hs.Specificity        |
  | PromotionFlag        | Binary, Outputable         | GHC.Types.Basic           |
  | FieldLabelString     | Outputable, Uniquable      | GHC.Types.FieldLabel      |
  | InlinePragma         | Binary                     | GHC.Types.InlinePragma    |

-------------------------
Metric Decrease:
    hard_hole_fits
-------------------------

Closes #21262, #27469

- - - - -
ab9ab895 by Cheng Shao at 2026-07-21T17:10:53-04:00
rts: always use StgInt to represent cost center id

Currently cost center id is modeled as `Int` and it should be `StgInt`
uniformly in the RTS, hence this patch. Fixes #27524.

- - - - -
94d8f83b by Cheng Shao at 2026-07-22T11:30:40-04:00
hadrian: clean up stale cabal package flags in the tree

This patch cleans up stale cabal package flags in the tree and related
hadrian/autoconf logic. Closes #27474.

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

- - - - -
0bf1d8c9 by Sasha Bogicevic at 2026-07-22T11:31:21-04:00
parser: don't suggest ImportQualifiedPost when it is already enabled

-Wprepositive-qualified-module unconditionally attached a hint to
enable ImportQualifiedPost, even when the extension was already on
(as it is by default under GHC2021). Record the extension's state in
the PsWarnImportPreQualified diagnostic and drop the hint when it is
already enabled.

Fixes #27380

- - - - -
700a1dd1 by Simon Jakobi at 2026-07-23T11:21:20-04:00
ci: Reduce lint job setup costs

Avoid fetching unnecessary history and submodules for lightweight lint
jobs. Run changelog validation without Hadrian.

Because the lint-author job is now based on the .lint template directly,
we enhance it to allow Git to read from the runner-owned checkouts,
In the previously used .lint-params template, this permissions issue was
addressed via `chown`.

Closes #27521.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
26a44fb0 by ARATA Mizuki at 2026-07-23T11:22:10-04:00
testsuite: Fix memory issues of doublex2_* and simd010

doublex2_* had reads from uninitialized memory.

simd010 had out-of-bounds array access.

Fixes #27544

- - - - -
4d798b17 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Eliminate STM_AWOKEN

It was used as nullary closure for the block_info.closure in the case of
a thread being awoken after an STM transaction.

However, while it was written, it was never read, so contributed nothing
to the behaviour. Furthermore, in the only place it was set (in
tryWakeupThread) the why_blocked was immediately overwritten by the
NotBlocked status, and the block_info was updated accordingly (by
appendToRunQueue).

So it didn't even serve a purpose of clarifying an intermediate state,
there really was no such intermediate state.

Cleaning this up will allow the BlockedOnSTM case to follow the same
pattern as the other why_blocked cases that do not use the block_info,
and in turn this reduces the number of different categories.

- - - - -
e1cece79 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document that eventlog thread stop code ThreadBlocked is no longer used

It has not been used since GHC 7.0.x (2011). In 7.2 all the BlockedOn*
codes were added, and these were and are used instead of ThreadBlocked.

- - - - -
795db115 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a proper mapping to eventlog external thread stop status

That is the mapping from rts-internal codes, to the coes used in the
status field in the eventlog EVENT_STOP_THREAD event.

See issue #9003 for what goes wrong when we mess this up. In that
ticket, people note that we should really not require the internal
tso->why_blocked codes to leak into the external eventlog thread stop
codes. The same principle applies to the StgThreadReturnCode.

This change properly separates them, and explicitly maps between them
using a pair of (compact, constant) tables. These tables are pretty
small (with no alignment constraints) and will soon shrink so it seems
a sensible tradeoff.

We also introduce and use proper EVENT_STOP_THREAD constants in the
event log format header. Previously there was not specification in the
code for these (only in the docs): the values were encoded into the
conversion code.

This will allow us to renumber the internal why_blockd codes without
breaking the eventlog output.

- - - - -
6f1c8efa by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove unused tso->block_info.wakeup member

Presumably it was used once, but not now.

- - - - -
740b88a9 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document StgTSOBlockInfo to say what cases use what members

In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union,
so we should be able to say for each union member the why_blocked cases
that use that member.

- - - - -
5b92eae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.mvar member and use it

in preference to the generic block_info.closure union member, with
casts.

The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.

- - - - -
d931715f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.unused member and use it

in preference to the generic block_info.closure union member, with
casts.

The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.

- - - - -
47e28ebb by Duncan Coutts at 2026-07-23T17:26:18-04:00
Avoid storing to tso->block_info.closure

In one case we can use a specific union member (.prev) instead. In
several cases the stores were in fact redundant because of subsequent
overwrites.

In scavengeTSO we replace setting tso->block_info.closure to a valid
closure, with an assertion that the block_info.unused is already set to
END_TSO_QUEUE which is a valid (static) closure.

- - - - -
96e4749d by Duncan Coutts at 2026-07-23T17:26:18-04:00
Renumber the tso->why_blocked constants

We can do this now because we have separated the internal values from
the external ones used in the eventlog.

This lets us put them back into a deliberate order and consolodate some
gaps.

More importantly, it is a prepation for a slightly more sophisticated
encoding.

- - - - -
8f62661c by Duncan Coutts at 2026-07-23T17:26:18-04:00
Define constants for the existing stg_threadStatuszh return codes

The stg_threadStatuszh reuses the internal tso->why_blocked codes but
also extends them with a couple previously magic values. This is awkward
since we need to know what those magic values are so we don't
accidentally use those values to mean something else. By pulling a
definition up to where the why_blocked codes are defined we will be able
to avoid mistakenly assining those codes some meaning (or just changing
the BlockedThreadComplete, BlockedThreadKilled code if necessary).

- - - - -
42c69ae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Extend the tso->why_blocked encoding to indicate block_info closures

We use some bit tricks to cheaply and generically test if a
tso->why_blocked tag implies that the corresponding tso->block_info will
contain a non-trivial valid closure (i.e. not just block_info.unused set
to END_TSO_QUEUE).

In particular we arrange for most why_blocked values to naturally have a
distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they
can come in either non-closure or closure forms. We allow an additional
bit to distinguish these cases. The non-closure forms are only from
legacy I/O managers: select and win32-legacy. So this extra bit
mechanism will be able to be retired once the legacy I/O managers are
themselves retired.

This means in a few places we need to untag the why_blocked value before
inspecting it, but in most places we do not.

- - - - -
7c64632b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the select I/O manager

- - - - -
8fd7104a by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the win32-legacy I/O manager

for the BlockedOn{Read,Write} since these use the non-heap allocated
StgAsyncIOResult.

- - - - -
e0da603b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Enforce the why_blocked and block_info rules in checkTSO

We now check the cases wher IsBlockInfoClosure should hold, the cases
that are supposed to use block_info.unused == END_TSO_QUEUE, and which
cases are allowed to use BlockInfoForceNonClosure.

This partially enforces the use of why_blocked as a tag for the
block_info union. We could be stricter and check for the correct
expected info table for the closure cases.

- - - - -
1dd0f381 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use IsBlockInfoClosure to simplify several tests

In GC and generic traversal we need to know if we should look at the
block_info.closure or not. Now we can do just that using a cheap bit
test on the why_blocked tag.

This fixes issue 26717, where the problem was that some GC modes did not
know when to look at block_info.closure, because the poll I/O manager
uses a closure for BlockedOn{Read,Write} while the select I/O manager
uses a non-closure. Now this information is in the why_blocked tag
itself.

- - - - -
7a00ffbc by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove the now-unused scavengeTSOIOManager

The GC no longer has to delegate to the I/O manager, since it can use
IsBlockInfoClosure to decide things itself.

- - - - -
522a481f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove duplicate assertion

- - - - -
0874d965 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Follow atomic access rules more consistently for tso->why_blocked

The rule is this:

store block_info *before* why_blocked
store why_blocked using store release

load why_blocked using load acquire
load block_info *after* why_blocked

This is a an atomic store release / load acquire pair and (if the reads
are in a separate thread to the writes, and the read receives the value
stored) then this guarantees a full "happens before" relationship of
these stores and loads.

In some cases, we do not need a full load acquire, because we don't read
the block_info at all and so do not need any ordering. In this case we
just need an atomic relaxed load.

This was being followed in most places, but not all. If there's good
reason in any case that we don't need atomic access, then we should
document that in a comment. In the absence of that I think it's easier
to follow the rule everywhere.

- - - - -
8f0bdbe1 by Duncan Coutts at 2026-07-23T17:26:19-04:00
Add a changelog entry

- - - - -
4fdfe757 by Alan Zimmerman at 2026-07-23T17:27:06-04:00
EPA: Keep decls together in ClassDecl

Similar to 1718230f4d3d19d8c49c0e5d496cb0fb6f399528 for HsValBindsLR,
this commit updates ClassDecl so that it no longer splits out the
assorted `LHsDecl GhcPs` until the renamer.

It does this by inserting a type family (separate from the classic TTG one) for this.

So

data TyClDecl
  ...
  | ClassDecl {
    ...
       tcdDecls   :: XClassDecls pass

with

type instance XClassDecls GhcPs = [LHsDecl GhcPs]
type instance XClassDecls GhcRn = ClassDeclX GhcRn
type instance XClassDecls GhcTc = ClassDeclX GhcTc

data ClassDeclX pass
  = ClassDeclX { tcdSigs    :: [LSig pass],              -- ^ Methods' signatures
                 tcdMeths   :: LHsBinds pass,            -- ^ Default methods
                 tcdATs     :: [LFamilyDecl pass],       -- ^ Associated types;
                 tcdATDefs  :: [LTyFamDefltDecl pass],   -- ^ Associated type defaults
                 tcdDocs    :: [LDocDecl pass]           -- ^ Haddock docs
    }

- - - - -
f586c885 by Simon Jakobi at 2026-07-24T18:05:00-04:00
ci: Use shallow submodule clones by default

Limit submodule clones to depth one to reduce CI checkout costs. Keep
fetching full submodule history for the submodule lint jobs, which
inspect commits across a range.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
306120d2 by Duncan Coutts at 2026-07-24T18:05:43-04:00
Fix flaky test T3994 on FreeBSD

On current FreeBSD versions, calling getpgid on a zombie process fails.
In T3994, if we're really unlucky with delays and scheduling then we can
end up in exactly that situation.

Just catch that specific exception and ignore it. It's rare, and not our
fault.

- - - - -
7b116a0b by Cheng Shao at 2026-07-24T18:06:24-04:00
ci: add missing workaround for docker permissions in lint jobs

Some lint jobs use ci-images with default user `ghc`, and the gitlab
ci docker executor requires the `sudo chown` workaround to fix
workspace directory permission issue. This patch adds the missing
workarounds for the lint jobs. Fixes #27554.

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

- - - - -
815149f3 by Andrzej Rybczak at 2026-07-25T15:06:43+00:00
Add -Wdefaulted-callstack

Adds a new warning, -Wdefaulted-callstack, which warns when an implicit
CallStack parameter is defaulted to the empty stack. In particular, this
includes call sites where a function with a HasCallStack constraint is called
from a definition that does *not* provide one. At such call sites the call stack
is cut off and does not include the enclosing definition's callers, which can be
a source of surprise if the user wants complete call stacks.

Closes #27077.

- - - - -
f6f2343f by Zubin Duggal at 2026-07-25T17:40:51-04:00
UniqueDFM: alter should preserve insertion order

Before it always inserting new elements at the end.
This is problematic because instances get inserted into the map with
`alterF`, which can change ordering of how instances are printed
with `:info` depending on the order in which we consult interfaces

I expect `alter id k = id` and `alter (fmap f) k = adjust f k`. Moving keys to
the end breaks that (`adjust` already preserves position).

Fixes #27532

- - - - -
5d0ab71a by fendor at 2026-07-27T17:31:05-04:00
Introduce global unit database cache

As a first step for better sharing of `UnitInfo` across `UnitEnv`,
we introduce a new datatype called `ExternalUnitDatabases`.

It primarily serves as an in-memory representation of *all*
`UnitDatabase`s across `UnitEnv`. This means, if multiple `HomeUnitEnv`s
depend on the same database, one way or another, we make sure that we
don't parse from disk every time.
Instead, we store the in-memory representation in `ExternalUnitDatabases`.

`ExternalUnitDatabaseCache` is the equivalent of `ExternalUnitState` in
the `UnitEnv`. It is a mutable variable wrapping `ExternalUnitDatabases`.

The mutable `ExternalUnitDatabaseCache` is used in `initUnits` to make
sure we don't parse the same unit database multiple times.

Almost by accident, we change the semantics of `initUnits` to honour
modifications to `packageDBFlags`.
The inability to change `packageDBFlags` while also reusing the already
parsed `UnitDatabase`s was reported in #26423 as a bug.
Hence, we think this behaviour change is warranted and acceptable,
especially since it comes with a breaking change to the `initUnits` API.

Add regression test for #26423
Closes #26423

- - - - -
6cce494a by fendor at 2026-07-27T17:31:05-04:00
Introduce UnitIndex for global external unit caching

`UnitInfo`s have been observed to cause a lot of memory usage in #27500.
Especially with multiple home units, as the same (external) units are
processed from scratch, even though most of the time we end up with
exactly the same `UnitInfo`.

We introduce a `UnitEnv` global cache that allows us to store external
unit information that is used across all `HomeUnitEnv`s.

The most important change in this commit is the introduction of the `UnitIndex`.
It stores a global mapping of `UnitId` -> `UnitInfo`, and `initUnits`
always uses the cached `UnitInfo` entry to populate each
`HomeUnitEnv`'s `UnitState`.
This allows us to ensure the following property:
...
Each `UnitInfo` should be alive exactly once in GHC.
All `UnitState`s should reference 'UnitInfo's stored in the 'UnitIndex'.
This ensured by calling 'initUnits' with the 'UnitIndex'.

In addition, the `ExternalUnitDatabases` may also hold a reference
to each on-disk representation of `UnitInfo`.

This means, we impose an hard upper bound on the number of `UnitInfo`s
alive in the GHC session:
...
The number of alive `UnitInfo`s closure objects must be the
sum of all loaded unit database times two.
We add performance regression tests that make sure the number of live
`UnitInfo` cannot exceed this threshold.

Closes #27500

-------------------------
Metric Decrease:
    MultiComponentModules
    MultiComponentModulesRecomp
    MultiComponentModulesRecomp100
    mhu-perf
    LinkableUsage02
-------------------------

These metrics increases are especially notable, as we are not even
sharing anything big but merely the global package database with 50
entries.
It shows how careful sharing of `UnitInfo` can improve memory usage.
We expect this to be much more notable when the whole cabal package
database is shared across multiple home units.

`LinkableUsage02` metric decreases on unreg and i386 platform, only.

---

Technical details

To share the `UnitInfo`s correctly, it is important that we extract
the `WireMap` into the `UnitIndex`. At the moment of writing, `WireMap`
must be globally the same for all `HomeUnitEnv`s.
This is important, as we could otherwise not cache the "fully-resolved"
`UnitInfo`, as we don't change the `UnitId` or `unitAbiHash` when
resolving wired-in units. Thus, there could be ambiguities, when the
`WireMap` is not the same for all `UnitState`s across the `UnitEnv`.

We consider a `UnitInfo` fully-resolved, if wired-in units have been
updated, the `UnitInfo` has been validated and variables in the unit
config, such as `${pkgroot}` have been resolved.

Updating the wired-in units requires the `WireMap` to be globally the
same.

- - - - -
f8e3bee9 by Zubin Duggal at 2026-07-27T17:31:49-04:00
testsuite: skip runtime stats tests on debugged compilers

Debugged flavours build the boot libraries without optimisation, so the
runtime numbers do not match the baselines.

- - - - -
1e326770 by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: mark #20706 tests fragile rather than broken

Whether the static linux linker issues manifest depends on the host
toolchain.

- - - - -
c0b13cbe by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: exclude libnuma from mostly-static

It needs static system libraries (libnuma.a) that many platforms do not
ship.

Fixes #26914

- - - - -
bee1913d by Alan Zimmerman at 2026-07-28T16:42:29-04:00
EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs

Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit
changes the as-parsed representation of class instance declarations to
[LHsDecl GhcPs], and only separates them by type from the renamer onward.

This also allows us to remove all the AnnSortKey machinery for exact
printing, as it is now no longer needed.

- - - - -
72c55eee by Cheng Shao at 2026-07-28T16:43:11-04:00
hadrian: implement and use writeFileAtomic to fix race condition

This patch implements `writeFileAtomic` in hadrian and change all
invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`,
to avoid multiple hadrian concurrent invocations overwriting the same
in-tree generated file not in the build root directory. Fixes #27536.
Additional notes:

- `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since
  it involves reading the file's older version, so their uses are left
  alone. It doesn't affect #27536 given their outputs are contained in
  the build root directory.
- It's possible to shrink this patch by only making writes outside the
  build root directory atomic. But I think it's not worth the effort
  for fine grained distinction here, and atomic writes within the
  build root directory should also improve robustness of a hadrian
  build.
- In the longer term we do want to make a ghc build only generate
  files within the build root directory, though that's a lot of work
  and outside the scope of this particular bugfix.

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

- - - - -
46d4f963 by Sylvain Henry at 2026-07-29T06:38:40-04:00
RTS: correctly mark slop bytes when shrinking large arrays (#19048)

Correctly mark slop bytes even when profiling is off so that heap census
doesn't traverse garbage-collected closures.

- - - - -
4762a8bf by Simon Jakobi at 2026-07-29T06:39:23-04:00
Add -XLazyFieldAnnotations (GHC proposal 752)

Unbundle the prefix `~` lazy field annotation syntax from StrictData. The
new LazyFieldAnnotations extension controls whether `~` is accepted on
constructor fields. StrictData (and Strict, transitively) imply the new
extension.

See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-la....

Closes #24455.

Assisted-by: Claude Opus 4.8

- - - - -
0b6dcc84 by Simon Jakobi at 2026-07-29T06:40:04-04:00
testsuite: Relax T24471 residency tolerance

T24471 peak residency fluctuates enough on i386 to cause spurious
failures. Use the standard residency tolerance while retaining the
existing allocation threshold.

See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
90e95b34 by Cheng Shao at 2026-07-29T06:40:45-04:00
compiler: fix missing top-level procedure labels in cmm dumps

This patch fixes missing top-level procedure labels in some
intermediate Cmm pass dumps. Fixes #27553.

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

- - - - -
360a5946 by sheaf at 2026-07-29T06:41:35-04:00
Add some type-family-heavy performance tests

FamAppCachePerf stress-tests the performance of lookups in the
type family application cache.

T27336 is a minimisation extracted from the reported reproducer.

SimplCastPerf is a measure of coercion growth due to the simplifier
calling mkTransCo without re-optimising the result.

- - - - -
3ec9e2b9 by Mike Pilgrem at 2026-07-31T08:21:33-04:00
GHC Guide: Improve docs on response files

- - - - -
e5b2a1f7 by sheaf at 2026-07-31T08:22:23-04:00
Disable Core Lint for TcPlugin_RewritePerf

This is a compiler performance test, but the test source hard-coded
-dcore-lint, defeating the measurement.

-------------------------
Metric Decrease:
    TcPlugin_RewritePerf
-------------------------

- - - - -
85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00
EPA: Remove LocatedP from OverlapMode

We have

  type LocatedP = GenLocated SrcSpanAnnP
  type SrcSpanAnnP = EpAnn AnnPragma

As the first step in removing this in favour of LocatedA which only
captures location, comments and trailing annotations, we remove it
from OverlapMode

We do this by moving the AnnPragma into the TTG extension point
instead.

- - - - -
c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00
Fix note typo

- - - - -
4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00
Apply oneShot Monad trick to STG LintM

- - - - -
21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00
stgLint: Use a single reader env for read only arguments.

- - - - -
d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00
EPA: Remove LocatedP from CType

The next step of removing use of LocatedP by moving
the AnnPragma for CType into its TTG extension point
instead.

- - - - -
8fc6f882 by Simon Jakobi at 2026-08-05T14:53:41-04:00
testsuite: Don't crash on non-UTF-8 test output

read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded
strictly (the first three with UTF-8, read_diff with the locale
encoding), so a test emitting invalid UTF-8 (binary output, or a crash
truncating a multi-byte character) raised UnicodeDecodeError and was
reported as a framework failure instead of its actual result.

Decode with errors='replace', like read_no_crs and safe_print.

Assisted-by: Claude Fable 5

- - - - -
56534866 by Simon Jakobi at 2026-08-05T14:53:41-04:00
testsuite: Colorize the test summary, also in CI

The summary headings were plain, and SUMMARY was colored unconditionally,
so the escapes also ended up in the file written by --summary-file.
Color is now decided per output sink via term_color.colored_if; see the
comments in term_color.

CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so
add --force-colors and pass it in .gitlab/ci.sh.

Assisted-by: Claude Opus 5

- - - - -
bceb541a by Simon Jakobi at 2026-08-05T14:53:42-04:00
testsuite: Repeat unexpected failure output in the summary

Finding out why a test failed meant scrolling back through a possibly
very long log to the point where the test ran. The summary now repeats
the captured output of unexpected failures, before the statistics, so
the most interesting part is at the end of the log (#16720).

Output mismatches report their diff instead of the mismatching stream
(see Note [Redundant output in test results]). The repeated output is
bounded per stream, and skipped altogether beyond
MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in
several ways share one block.

Test results now report a source-relative directory, stable regardless
of where the run was started from.

Assisted-by: Claude Fable 5

- - - - -
2ab02c57 by Ben Gamari at 2026-08-05T14:54:24-04:00
base: Don't drop exception context in SomeException(toException)

For reasons that are lost to time, the implementation of [CLC #200]
that was merged inappropriately dropped `ExceptionContext` in the
`toException` implementation given to `SomeException`.

Fix this infelicity.

[CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200

- - - - -
126ce574 by Vladislav Zavialov at 2026-08-05T14:55:05-04:00
Test case for #20902

Starting with GHC 9.14.1 (the first major release to include 51e3ec83),
and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68
and b30f25591e), all examples in this ticket are handled as expected.

- - - - -
b14d8d59 by Alan Zimmerman at 2026-08-05T14:55:46-04:00
EPA: Remove LocatedP, last use in WarningTxt

The last step of removing LocatedP, by moving the AnnPragma for
WarningTxt into its TTG extension point instead.

This also allows us to remove LocatedP and SrcSpanAnnP

- - - - -
70b58c8f by Vladislav Zavialov at 2026-08-05T14:56:27-04:00
Test cases for #18725

Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in
this ticket no longer panics. A standalone kind signature breaks the recursive
loop, so the type constructor can be used in a kind within its own group.

T18725a checks that this is accepted with the signature present, while T18725b
confirms it is still rejected without it.

- - - - -
b18c8dd5 by Zubin Duggal at 2026-08-06T15:51:01-04:00
hie files: Dump the type table when dumping with -ddump-hie

- - - - -
f839d0fb by Zubin Duggal at 2026-08-06T15:51:01-04:00
hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast

Fixes #25709

- - - - -
5753ebaa by Simon Jakobi at 2026-08-06T15:51:43-04:00
testsuite: fix stale paths for the ghc-config build artifacts

ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in
6c7a49139c, but the .gitignore entry and the clean rule still referred to
the old location. As a result the compiled ghc-config binary, which
boilerplate.mk rebuilds on every make-driven test run, showed up as an
untracked file and was never cleaned.

Assisted-by: Claude Opus 5

- - - - -
246d4d72 by Simon Peyton Jones at 2026-08-06T15:52:25-04:00
Documentation only

...driven by my investigation of #27591

- - - - -
be69e9df by Alan Zimmerman at 2026-08-06T15:53:05-04:00
EPA: Replace AnnPragma with individual types

We introduced AnnPragma as a common type for all pragma usages wrapped
in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma
moved into the TTG points for the given items, we can ensure that each
carries only the annotations it needs.

So we remove AnnPragma, and in its place bring in
  AnnCType
  AnnWarningTxt
  AnnOverlap
  AnnAnnDecl
  AnnPragSCC

- - - - -
0779e12c by Simon Jakobi at 2026-08-07T12:36:11-04:00
Cmm: print unreachable blocks under -dppr-debug (#27368)

Unreachable blocks linger in a CmmGraph's block map for most of the Cmm
pipeline, but pprCmmGraph only ever printed the blocks reachable from the
entry, so dumps looked consistent while the graph was not. Issues like
 #27368 were hard to debug due to this.

pprCmmGraph now appends the stored-but-unreachable blocks under a
"// unreachable blocks:" heading when -dppr-debug is on.
See Note [unreachable blocks] in GHC.Cmm.Pipeline.

Assisted-by: Claude Opus 5

- - - - -
3a0f9a51 by Simon Peyton Jones at 2026-08-07T12:36:54-04:00
Fix three bugs related to required type args and INLINE pragmas

* `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front,
  leading to a Lint error (#27557)

* The arity in an InlineSaturation is the VisArity not the Arity; the
  two can differ when we have "required" type arguments.  This made the
  INLINE pragma argument counting go wrong in `makeCorePair` (#27590).

* When a simple binding has a type signature, we take special path in `tcPolyCheck`,
  leading to an outer `AbsBinds` that has no dictionaries, even when the binding
  is in fact overloaded.  That confused the inline-arity computation in
  `makeCorePair` (#27589).

The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`.
That actually simplifies the API of `makeCorePair`, which is nice.

The first bug is fixed by swapping the visiblity flags in
`GHC.Core.Opt.Arity.mkEtaForAllMCo`

Getting the INLINE behaviour right led to some perf changes:
  * Runtime /halved/ on T7954 due to better specialisation
  * Compile time increased by 6% in T21839c because a bit more inlining
    happened, as it always should have done.
  * For some reason compile-time max-bytes-used dropped by 30% on
    T27336, but only on one build configuration; and it increased
    on LinkableUsage02 by 6% on another configuration

Geometric mean effect on our compile time benchmarks is +0.1%.

Metric Decrease:
    T27336
    T7954
Metric Increase:
    LinkableUsage02
    T21839c

- - - - -
4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00
Discard type arguments in tcPatToExpr (#27440, #27583)

The builder expression of an implicitly bidirectional pattern synonym must not
mention types written in the RHS:

  * Invisible type arguments led to a panic (#27440)
  * Required type arguments failed with out-of-scope variables (#27583)

Both are now discarded, following the precedent established by pattern
signatures (#9867).

Discarding type arguments takes some care: a type pattern cannot be told from a
value pattern by syntax alone, as the `type` keyword may be omitted. Consider:

    data T a b c where
      MkT :: forall a. forall b c -> a -> T a b c

    pattern P :: x -> T x y z
    pattern P x = MkT @a (type b) c x

In P's right-hand side, `@a` and `type b` are clearly type arguments, but what
about `c` and `x`? We can only tell by matching the patterns against MkT's
type. So tcPatToExpr now runs in TcM and matches the arguments against the
constructor's TyVarBinders using zipPatsBndrs, which is made public for this
purpose. The resulting builder is $bP x = MkT _ _ x.

See Note [Discarding types in the builder expression].

Test cases: T27440a T27440b T27440c T27440d T27440e
            T27583a T27583b T27583c T27583d T27583e T27583f T27583g

Metric Increase: LinkableUsage02
Metric Decrease: T27336

Assisted-by: Claude Opus 5

- - - - -
eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00
mkWpFun_FRR: fix ordering of coercion composition

When the subsumption machinery generates an eta-expansion, we must
perform a representation polymorphism check to ensure the lambda binder
it introduces has a fixed runtime representation.
This is done in GHC.Tc.Utils.mkWpFun_FRR.

This check involves composing quite a few coercions, arising from
representation-polymorphism checks on both the actual and expected
argument types. These coercions are then chained using HsWrapper
composition, <.>. The ordering of composition was incorrect, leading to
the Core Lint failure reported in #27639. This commit fixes that.

Fixes #27639

- - - - -
3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Word64Map: add compareSize

compareSize m c compares the size of a map to an Int, but unlike
compare (size m) c it stops traversing the map once the outcome is
determined.

Based on https://github.com/haskell/containers/pull/1139

Assisted-by: Claude Opus 5

- - - - -
6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00
Use a pigeonhole sort for deterministic UniqDFM iteration

Deterministic UniqDFM iteration used a list mergesort, allocating O(n
log n) cons cells and contributing significantly to compiler allocations
(#27459).

Use a pigeonhole sort where appropriate, while retaining the mergesort
fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic
iteration].

The peak_megabytes_allocated increase for LinkableUsage02 is probably
due to GC timing noise. See #27613.

-------------------------
Metric Decrease:
    InstanceMatching
    InstanceMatching1
    ManyAlternatives
    T12707
    T13379
    T13719
    T24471
    T27336
    T5321FD
    T5321Fun
    T783
Metric Increase 'peak_megabytes_allocated':
    LinkableUsage02
-------------------------

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
a938ab12 by sheaf at 2026-08-09T15:20:48-04:00
Testsuite: don't measure max residency for T27336

We really care more about total allocations for this test, so this commit
removes the maximum residency measurement.
- - - - -
7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00
EPA: Remove LocatedE, replace with LocatedA

This gets rid of one more LocatedXXX occurrence

- - - - -
9df24b7e by sheaf at 2026-08-10T14:28:30-04:00
hie.yaml: use a polyglot shell/batch script

This commit merges hie-bios and hie-bios.bat into a single polyglot
script. This avoids Windows users having to manually update hie.yaml
in order to be able to use HLS.

- - - - -
7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00
EPA: Remove type parameter from AnnList

This is a step towards cutting AnnList down to its core for formatting
lists only

- - - - -
e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00
driver: Link object files in a deterministic order

The object files handed to the linker come from the HomePackageTable,
which is ordered by the order in which modules finished compiling.  With
-j1 that is the build plan order, with -jN it is whatever the scheduler
produced, so the same sources can link to different (but equivalent)
binaries.

The order reaches the output: .text and .rodata contributions are
concatenated in link order, so e.g. building the hdav executable of the
DAV package twice, once with -j1 and once with -j4, yields two binaries
that differ in ~100kB of section contents.

Sort the home modules by module before collecting their linkables,
guarded under `Opt_ObjectDeterminism` .

Fixes #27612

Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de>

- - - - -
556db2f3 by sheaf at 2026-08-10T21:32:06-04:00
Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite

As remarked in #27628, this module currently sits on a knife's edge: if
the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then
SpecConstr suddenly kicks in and causes disastrous reboxing of the
LiftingContext argument.

To make this less likely to happen, this commit lowers the SpecConstr
threshold.

- - - - -
c77d88fc by sheaf at 2026-08-13T10:15:22-04:00
Allow rewriting in RuntimeReps for newtype ConPats

This commit implements PHASE 2 of the FixedRuntimeRep plan described in
Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype
constructor patterns.

In short, GHC now accepts programs of the form

  f (MkN x) = ...

in which the argument 'x' of the newtype constructor pattern 'MkN x'
has a representation that is not syntactically concrete, e.g. it can be
'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples.

There are two main parts to the implementation:

  1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat.
     See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat.

  2. Desugaring. We restructure the code for desugaring pattern matches
     by allowing the scrutinised match variable to be casted. This allows
     us to accumulate coercions and avoids creating binders at intermediate
     types tha don't have a fixed RuntimeRep.
     See the revamped Note [Match Ids] in GHC.HsToCore.Monad.

Fixes #20363

-------------------------
Metric Increase:
    InstanceMatching
-------------------------

- - - - -
6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00
Improve the documentation of `--show-iface`

This change in particular gets rid of the claim that `--show-iface`
writes *the* contents of the interface file in question. It doesn’t do
that; it only writes those parts that are likely of interest to a human
reader.

- - - - -
4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00
RTS: fix LDV profiler's slop skipping (#27585)

processHeapForDead was the one heap scanner not updated for the slop
marker encoding introduced in #19048. It still assumed slop is zeroed:

    while (p < bd->free && !*p) p++;   // skip slop

so it stopped at the (StgWord)(-1) sentinel and passed it to
processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage
size was read out of LDVW and the scan ran off the block, tripping
ASSERT(p == bd->free) on a debug RTS and silently corrupting the census
otherwise.

The loop was hand-copied in four places, so factor it out into skipSlop
in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and
LdvProfile.c.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

- - - - -
1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00
hadrian: Fix links to remaining doc sites to not use the package hash for haddock links

In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock
directory. This patch takes care of a  few remaining links that were missed in that patch

Fixes #27671

- - - - -
257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00
Testsuite: widen InstanceMatching acceptance window to 5% (#27673)

...in order to unblock CI.

Assisted-by: Claude Fable 5

- - - - -
e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00
Major patch to re-engineer known-key names

This big patch implements the New Plan for known-key names,
described in #27013.

Read the big Note [Overview of known-key names] in GHC.Types.Name

Some things had to be reworked slightly to accomodate the new known-keys
design. A significant one was the generation of auxiliary KindRep
bindings, which was greatly simplified. Note [Grand plan for Typeable]
was updated accordingly. Another example: GHC.Internal.CString was
merged into GHC.Internal.Types.

Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita@gmail.com>

The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed

Metrics: compile_time/bytes allocated
-------------------------------------
                                                       Baseline
                                  Test    Metric          value      New value Change
------------------------------------------------------------------------------------------
      MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432  +2.8%  BAD
   MultiComponentModulesRecomp(normal) ghc/alloc    601,924,960    621,884,888  +3.3%  BAD
MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704  +5.4%  BAD
             MultiLayerModules(normal) ghc/alloc  3,861,537,072  3,706,919,512  -4.0% GOOD
                        T13701(normal) ghc/alloc  3,517,246,392  3,237,179,616  -8.0% GOOD
                        T13820(normal) ghc/alloc     28,961,056     29,663,208  +2.4%  BAD
                        T14697(normal) ghc/alloc    472,044,184    443,550,048  -6.0% GOOD
                        T18140(normal) ghc/alloc     47,905,664     49,115,808  +2.5%  BAD
                         T4801(normal) ghc/alloc    269,339,096    263,432,040  -2.2% GOOD
                          T783(normal) ghc/alloc    341,112,672    333,339,952  -2.3% GOOD
                hard_hole_fits(normal) ghc/alloc    222,164,728    213,433,808  -3.9% GOOD
                      mhu-perf(normal) ghc/alloc     49,011,440     46,706,280  -4.7% GOOD

                             geo. mean                                          +0.1%
                             minimum                                            -8.0%
                             maximum                                            +5.4%

All performance regressions were investigated in depth. The surviving
ones:

- MultiComponentModules100, MultiComponentModulesRecomp100,
  MultiComponentModulesRecomp regresses because existing bugs that make
  an additional implicit edge do too much redundant work: #27053 and #27461
- T13820, T18140, T10547, T13035 regress because we load an additional
  interface and associated Names for GHC.Essentials.

-------------------------
Metric Decrease:
    MultiLayerModules
    T13379
    T13701
    T14697
    T26989
    T4801
    T783
    T9961
    hard_hole_fits
    mhu-perf
    size_hello_artifact
    size_hello_obj
    size_hello_unicode
Metric Increase:
    LinkableUsage01
    LinkableUsage02
    MultiComponentModules100
    MultiComponentModulesRecomp
    MultiComponentModulesRecomp100
    T10547
    T13035
    T13820
    T18140
    T18698a
    T18698b
    T20049
-------------------------

Bumps submodule binary

Closes #27013

- - - - -
61665e79 by sheaf at 2026-08-14T01:09:33+02:00
Allow GHC.Essentials to be hidden

This commit overhauls several aspects of the known entity handling,
in order to allow GHC.Essentials to be hidden without a proliferation
of special cases in the compiler.

The main contribution is to introduce the 'UnresolvedImport' datatype
which cleans up a lot of ad-hoc handling relating to 'ModSummary',
fixing #27603. This allows us to reduce duplication, e.g. by having
Backpack reuse 'mkUnresolvedImports' instead of replicating the
"add implicit imports" logic. It also makes it easier to avoid
undesirable edge cases (such as making sure that the Template Haskell
'reifyModule' function does not leak the implicit GHC.Essentials import).
In particular, the infamous 'findImportedModuleWithIsBoot' is now simply
'resolveImport', taking a single 'UnresolvedImport' and resolving it
to a 'FindResult' (usually a 'Module').

Other changes:

  - Cache the result of looking up GHC.Essentials (in TcM and DsM
    environments) to avoid redundant work.
    This reduces allocations on LinkableUsage01 and hard_hole_fits.
  - Properly look up known entities for StaticPointers like we do for
    other known entities everywhere else. This allows e.g. modules in
    ghc-internal to use -XStaticPointers.
  - When using multiple home units, we are now careful to handle the
    situation in which we may have multiple GHC.Essentials modules
    around. See the new tests under 'driver/multipleHomeUnits'.

- - - - -
b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00
Increase test coverage of diagnostics, batch 2

Add test cases for the previously untested diagnostics:
  [GHC-26133] TcRnForeignImportPrimSafeAnn
  [GHC-68444] SumAltArityExceeded
  [GHC-63966] IllegalSumAlt
  [GHC-23882] IllegalDeclaration
  [GHC-60220] InvalidCCallImpent
  [GHC-18816] RecGadtNoCons
  [GHC-38140] GadtNoCons
  [GHC-37056] InvalidTypeInstanceHeader
  [GHC-78486] InvalidTyFamInstLHS
  [GHC-39639] DefaultDataInstDecl
  [GHC-78822] AssocDefaultNotAssoc
  [GHC-43510] NotSimpleUnliftedType
  [GHC-41843] IOResultExpected
  [GHC-07641] AtLeastOneArgExpected
  [GHC-52886] InvalidTopDecl

Remove unused error constructors:
  [GHC-92057] ImportLookupAmbiguous

- - - - -
7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00
testsuite: Drop peak_megabytes_allocated from LinkableUsage tests

LinkableUsage01/02 collected all metrics with a 2% tolerance. For
peak_megabytes_allocated, whose granularity is 1 MB, that window is
under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the
test (#27613, #27489). Drop that metric: max_bytes_used guards the
Linkable-retention property with byte granularity, at a tolerance
that still comfortably exceeds the noise observed in CI.

Assisted-by: Claude Fable 5

- - - - -
e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00
testsuite: Don't truncate fractional baselines when computing bounds

RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with
int() before applying the tolerance. Baselines can be fractional (they
are averaged over several measurements), so this skewed the acceptance
window downwards: in #27613, a baseline of 33.67 at 2% tolerance
yielded bounds (32, 34) instead of (32, 35), rejecting a measurement
that was within tolerance.

Assisted-by: Claude Fable 5

- - - - -
db959f83 by Simon Jakobi at 2026-08-14T15:16:44-04:00
testsuite: Expect length001 failure in nonmoving_thr_sanity

length001 relies on an optimization rule to avoid excessive stack use.
The nonmoving_thr_sanity way does not enable optimization, so classify
its stack overflow as an expected failure, as is already done for the
other unoptimized nonmoving ways.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
4f2b7d90 by Simon Jakobi at 2026-08-14T15:16:44-04:00
testsuite: Omit T22859 in nonmoving threaded ways

T22859 checks allocation-limit handlers with output that depends on
precise allocation behaviour. The nonmoving threaded ways change where
these limits are reached, just as the already-omitted LLVM ways do.

Omit these ways instead of treating their incidental output differences
as test failures.

Assisted-by: gpt-5.6-sol via Codex CLI

- - - - -
c4abddcb by Simon Jakobi at 2026-08-14T15:16:44-04:00
rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761)

Since d1f3c63701, Eq ThreadId is implemented via the RTS function
eq_thread, but the JS RTS never provided it, so comparing ThreadIds
for equality on the JS backend crashed with

    ReferenceError: h$eq_thread is not defined

Like the C implementation, h$eq_thread uses pointer equality: The JS
RTS has exactly one thread object per thread.

Since previously no test exercised eq_thread directly, this commit
adds a test covering equality, its stability across GC, and agreement
with Ord.

Assisted-by: Claude Fable 5

- - - - -
4a7defa1 by Simon Jakobi at 2026-08-14T15:16:44-04:00
testsuite: Make listThreads1 insensitive to the RTS's own threads

listThreads1 expected `listThreads` to return exactly [ThreadId 1]. That
holds only under a non-threaded RTS. Under a threaded RTS however there
are more threads present, so we change the test to simply check that
`myThreadId` is present in the list.

Assisted-by: Claude Opus 5

- - - - -
b757727a by Vladislav Zavialov at 2026-08-14T15:17:27-04:00
Fix tcLookupId panic with RequiredTypeArguments and PatternSynonyms (#27586)

The arguments declared on the left-hand side of a pattern synonym are looked up
as term variables bound by its right-hand side. Prior to this patch, that lookup
panicked with RequiredTypeArguments:

    data T a where
      MkT :: forall a -> T a

    pattern P :: Int -> T Int
    pattern P x = MkT x

On the RHS, `x` looks like a term argument, so the renamer binds it in the term
namespace. Only during type checking does it turn out to be a type variable, so
the lookup on the LHS finds an ATyVar rather than an ATcId. As the lookup was
done with tcLookupId, it resulted in a panic.

Now the arguments are looked up with tcLookupPatSynArg, which reports an illegal
term-level use of `x`, just as an ordinary function definition `f (MkT x) = x`
does.

Test cases: T27586a T27586b T27586c

Assisted-by: Claude Opus 5

- - - - -
c130188d by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
loopImports: Don't dup ms_uid in summary imports

We were writing the ms_unitid of the mod summary with every single
import of that module

That complicated the code (as though the UnitId in that list could ever
be something else) and also allocates unnecessarily per every mod
import. Very slight allocation decrease measured locally in a few tests:
(MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%)

Purely a clean up.

- - - - -
c71166a8 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
downsweep: make control flow simpler and cache correct

This refactor extracts the control flow of downsweep into a single
function `dfsBuild`, which takes care of iteratively expanding and
traversing all nodes of the in-construction module graph necessary to
build a full `ModuleGraph`.

There are three levels of caching going on, all of which are necessary
to make sure we don't do repeated work (notably, NEVER summarise the
same module twice).

1. `dfsBuild` accumulates the final module graph and never revisits the
   same node of the module graph. Cache is keyed by the final
   `ModuleGraph`s `NodeKey`s.

2. For Module A in home-unit u1, each import in the list of imports
   needs to be *found* (call to `findImportedModuleWithIsBoot`): at this
   point, we only have the `ModuleName` of the import, not the `Module`.
   This *finding* is somewhat expensive, so we cache it as well
   (`ImportsCache`). The cache key is the home-unit to which the module
   belongs~[1], the import package qualifier, and the ModuleName.

   [1] Different home-units will have different package flags, which means
   potentially different `Module` resolution for the same `ModuleName`.

3. The most expensive operation we want to avoid is summarising a
   `Module` into a `ModSummary`, which notably involves parsing the
   module header from scratch.
   The third cache, in essence, maps a `Module` to its `ModSummary`
   (named `ModSummaryCache`). This cache upholds the invariant: we NEVER
   summarise the same module twice. In practice, the cache key is the
   Module's UnitId and the Source path; the reason is we need to
   distinguish between `.hs` and `.hs-boot` files, as their summaries
   will differ.

   Note that (2) can't guarantee this alone: Two ModuleName imports in
   separate units can (and likely do) map to the same `Module`.

Note that the previous implementation failed to achieve the
no-duplicate-work summarisation invariant, and we ended up doing a
quadratic amount of processing in scenarios like test
`MultiComponentModules100`.

See also Note [Downsweep Control Flow and Caching]

Fixes #27461

Perf changes:
         MultiComponentModules(normal) ghc/alloc  2,097,389,264  1,992,186,736  -5.0% GOOD
      MultiComponentModules100(normal) ghc/alloc 24,310,173,770 21,293,867,360 -12.4% GOOD
   MultiComponentModulesRecomp(normal) ghc/alloc    602,761,394    498,543,984 -17.3% GOOD
MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,968,240  8,895,404,864 -25.2% GOOD

-------------------------
Metric Decrease:
    MultiComponentModules
    MultiComponentModules100
    MultiComponentModulesRecomp
    MultiComponentModulesRecomp100
-------------------------

- - - - -
ebc4047b by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
implicitRequirementsShallow can never reach HoleUnit

findImportedModule will never return `HoleUnit` for a `ModuleName`
(a `HoleUnit` can only be found as a signature instantiation, never as a
directly *imported* thing)

Therefore, we can drop `[ModuleName]` returned by
`implicitRequirementsShallow`, which makes many things dead code.
Namely, the call to `implicitRequirementsShallow` from
GHC.Driver.Downsweep which was a performance bottleneck (for doing lots
of duplicate work in findImportedModule) is now entirely gone.

Fixes #27053

In an MR with this patch and the downsweep refactor (previous commit), CI says:

         MultiComponentModules(normal) ghc/alloc  2,097,396,728  1,943,662,304  -7.3% GOOD
      MultiComponentModules100(normal) ghc/alloc 24,310,182,136 17,227,574,440 -29.1% GOOD
   MultiComponentModulesRecomp(normal) ghc/alloc    602,769,518    449,973,656 -25.3% GOOD
MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,976,408  4,828,894,160 -59.4% GOOD

-------------------------
Metric Decrease:
    MultiComponentModules
    MultiComponentModules100
    MultiComponentModulesRecomp
    MultiComponentModulesRecomp100
-------------------------

- - - - -
85a6ab01 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
downsweep: Cache negative results

When traversing a module graph structure, a uniquely identified node
should always expand to the same thing.

I don't see how visiting the same node which failed to be expanded a
first time would ever successfully expand the second time we try to
expand it (eg. when coming from a different edge to it -- it is still
the same node!). The node expansion is local, based just based on the
node itself, not on the path to get there.

Therefore, this patch removes the weird behavior and commentary of
`dfsBuild` wrt to `Nothing` not being cached and being potentially
expanded a second time around to something different, which was
misleading and, ultimately, incorrect.

Now, we have a `MGRes`, which is more explicit about a node being
Skipped just being a node that is ignored whenever it is found (and that
skip is cached) -- and we may want to do this due to failures or due to
just trying nodes which might not work on purpose, like hs-boots.

We uniformly cache positive and negative results and remove the
assumption that there might be an ordering in which the same node
visited at a later time might be expanded differently.

This makes it possible to traverse the module nodes in parallel without
a change in behavior, since there's no longer a hidden ordering
requirement.

- - - - -
56747c3f by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00
Organize and clean-up GHC.Driver.Downsweep

Simply some cosmetic changes, moving definitions around to structure the
module better into its relevant sections

(In go (ns ++ ss), it's not a problem to use ++ because it's a good
producer and we won't have to append fully before processing the next
item in go)

- - - - -
12f64118 by Wolfgang Jeltsch at 2026-08-15T06:31:12-04:00
Add support for textual output of bytecode file content

- - - - -
a737df91 by Brandon Chinn at 2026-08-15T12:40:25-04:00
Add law in qualified strings doc

- - - - -
e3188581 by Zubin Duggal at 2026-08-15T12:41:06-04:00
DmdAnal: Fix maxDmdType

We need to eta expand the smaller DmdType using defaultArgDmd, like in lubDmdType.

Introduce zipDmdType as a common combinator to implement both maxDmdType and lubDmdType
uniformly.

fixes #27626

- - - - -
ca9b0b22 by mangoiv at 2026-08-15T12:41:47-04:00
hadrian: set the executable bit for hie-bios.bat

- - - - -
1aac7095 by sheaf at 2026-08-16T04:37:16-04:00
Avoid wasteful allocations in mkTyConAppCo

The idiom "traverse isReflCo_maybe" followed by "map fst" used in
'GHC.Core.Coercion.mkTyConAppCo' was allocating a lot of waste.
This commit uses 'GHC.Data.Unboxed.traverseMaybeUB' to avoid all these
unnecessary intermediate allocations.

In a quick microbenchmark for 'mkTyConAppCo', this change resulted in:
  - refl case (all argument coercions are reflexive):
    - -60% runtime
    - -80% allocations
  - non-refl case:
    - from 0% to -12% runtime (depending on which argument is non-refl)
    - from 0% to -70% allocations ( -- '' -- )

Fixes #27648

-------------------------
Metric Decrease:
    FamAppCachePerf
    SimplCastPerf
    T12425
    T15703
    T26426
    T3064
    T9872a
    T9872b
    T9872b_defer
    T9872c
    T9872d
    T5321Fun
    T9020
    T9630
    TcPlugin_RewritePerf
Metric Increase:
    LinkableUsage02
-------------------------

- - - - -
3915e982 by Alan Zimmerman at 2026-08-16T04:37:58-04:00
EPA: Remove al_trailing from AnnList

It was not being used

- - - - -
fed942ac by Andreas Klebinger at 2026-08-17T12:11:57-04:00
testsuite: Use sigkill in process009.

SIGHUB might have been blocked by a (grand)*parent of the test.
In such cases the test would fail as the python process would simply
exist gracefully instead of committing to a premature end.

By using SIGKILL we can rely on the signal not being blocked, fixing #27578
in the process.

- - - - -
574c875f by Andreas Klebinger at 2026-08-17T12:12:39-04:00
Simplify comparison in DFM.hs

Fixes #27669

- - - - -
d8f1a2a3 by Alan Zimmerman at 2026-08-17T12:13:18-04:00
TTG: Add extension points to BooleanFormula

They are currently unused, but will be used for exact print
annotations next, allowing us to get rid of LocatedBF / SrcSpanAnnBF

- - - - -
93a2b20f by Andreas Klebinger at 2026-08-18T04:31:04-04:00
Fix a number of incorrect module references:

Fix module reference in Note [DataCon wrappers are conlike].
Fix module reference in Note [Detailed InertCans Invariants].
Fix module reference in Note [GHC's data format representations].
Fix module reference in Note [Grand plan for static forms].
Fix module reference in Note [How tuples work].
Fix module reference in Note [Solved dictionaries].
Fix module reference in Note [Stacktraces from Info Table Provenance Entries (IPE based stack unwinding)].
Fix module reference in Note [The VarBndr type and its uses].

Found the incorrect references with a llm.

- - - - -
eb0dfb01 by Simon Jakobi at 2026-08-18T04:31:44-04:00
ci: Run stack-hadrian-build only in full-ci pipelines

The job exists to catch changes that break hadrian/build-stack (#18726),
but nothing in the pipeline depends on it, and it can only break when
hadrian's dependencies change. Restricting it to full-ci (like
hadrian-multi) still covers marge-bot merge batches, so such breakage
cannot reach master unnoticed, while ordinary validate pipelines skip
the job.

Assisted-by: Claude Fable 5

- - - - -
b9160962 by Simon Jakobi at 2026-08-20T14:57:52-04:00
testsuite: Show baseline sample count and range in perf failures

A perf baseline is the mean of all samples recorded for a commit, and
it prints as a single number, hiding how far the samples spread. When
the spread is wide, this can indicate an unstable metric that isn't
actually useful as a signal for the perf tests.
For example, in #27602, T27336's peak_megabytes_allocated baseline
showed as 757 when the underlying samples were 605 and 909.

When the baseline is averaged from more than one sample, say so in the
failure output: the one-line stat-failure reason shows the sample
range, and the detail block lists the raw samples. Single-sample
baselines print exactly as before.

Context: #27602

Assisted-by: Claude Fable 5

- - - - -
a4979877 by Simon Jakobi at 2026-08-20T14:57:52-04:00
testsuite: Fold Baseline into CommitMetric

A Baseline was just a CommitMetric plus the commit it came from, built
by copying fields across. Since get_commit_metric already knows that
commit, record it on CommitMetric itself and drop Baseline. This also
collapses both branches of find_baseline into plain returns.

Assisted-by: Claude Fable 5

- - - - -
99fb8d68 by Simon Jakobi at 2026-08-20T14:57:52-04:00
ci: Clarify comment on pushing perf notes after failures

Context: #27602

Assisted-by: Claude Fable 5

- - - - -
2ca87972 by Alan Zimmerman at 2026-08-20T14:58:36-04:00
EPA: Remove LocatedBC / SrcSpanBF

The custom annotations are now in the BooleanFormula TTG extension
points, so LBooleanFormula can now use the standard LocatedA.

- - - - -
d2bc32aa by Simon Peyton Jones at 2026-08-21T12:59:26-04:00
Better handling of serialisation of wired-in names

Fixes #27501

- - - - -
d2795ffc by Alan Zimmerman at 2026-08-21T13:00:05-04:00
EPA: Remove NoEpTok/NoEpUniTok, using an unhelpful SrcSpan instead

Also introduce helper functions noEpTok and noEpUniTok to serve
as simple replacements in code inserting an token annotation without
location information.

- - - - -
b5d29ab8 by Brandon Chinn at 2026-08-25T18:42:08-04:00
Add Data.RealFloat and Infinity/NegInfinity/NaN pattern synonyms (#26961)

- - - - -
e60eb3bc by Andreas Klebinger at 2026-08-25T18:42:59-04:00
rts linker: Fix pointer arithmetic issue in flushInstructionCacheRISCV64

We accidentally operated over `uint64_t*` when we should use `uint8_t`.

Fixes #27569

- - - - -
e9bbe8f9 by Andreas Klebinger at 2026-08-26T15:09:23-04:00
cmm dumps: Add machop width info with -dppr-debug for infix ops.

- - - - -
86e3a9d8 by Andreas Klebinger at 2026-08-26T15:09:24-04:00
CmmLint: Check for unsupported MachOp widths

machOpArgReps now maps MachOp + Width to a list of supported
argument widths or Nothing if the given operation is not supported
at the given width.

This allows us to check for nonsensical combinations like FloatToInt
at Word16.

Similarly we now check that every address is actually wordwidth.

- - - - -
13781cca by Andreas Klebinger at 2026-08-26T15:09:24-04:00
arm64 ncg: The big subword truncation fix.

A set of slightly related fixes to arm subword handling:

Bitmask immediates:

Don't produce overflowing assembly literals.
There is still another bug here that causes us to miss some valid
literals but we will fix that later.

Improve subword truncation handling:

We now use a small set of helpers to truncate `Register` values rather
than truncating immediate `Reg` values which greatly simplifies the code
structure. This fixes a great many bugs to do with sign/zero extending subwords
or the lack thereof.

We now establish the invariant that subword values are zero-extended at
every site at which they come into "scope" of the ncg, and rely on the
invariant throughout rather than pessimistically inserting redundant
extensions in a hodgepodge manner at the use sites of these values.

This fixes at least the bugs described in issues #27533, #27430
 #27537, #27538, #27539, and #27550. But likely more bugs yet not
found.

Subword ffi results:
Apply truncations when calling functions returning
subword values.

genCondJump:
Don't sign extend signed values in the input register as
it might map to a local variable, corrupting the value stored within.

Fix subword store/load instructions.:

We used to read those at 32bit width even for smaller values possibly
resulting in invalid memory access. Now we construct the suffix for
subword variants based on the instruction format for these.

- - - - -
d8fa5d7c by Andreas Klebinger at 2026-08-26T15:09:24-04:00
arm64 ncg: Fix MO_V_Broadcast for non-literals.

We now use OpReg instead of OpScalarAsVec as required since we broadcast a gp register.

Also adds a test. Fixes #27565.

- - - - -
94822c95 by Andreas Klebinger at 2026-08-26T15:09:24-04:00
Add some test cases covering bugs in the arm ncg.

* Test for #27430 (subword ffi results)
* #27537 - subword conversions
* #27538 - subwords used in conditional
* #27533 - single byte read

- - - - -
dd1ba88a by Andreas Klebinger at 2026-08-26T15:09:24-04:00
cmmLint: Lint against MO_FS_Truncate subword use.

- - - - -
fd22f71e by Zubin Duggal at 2026-08-26T15:10:20-04:00
ghc-internal: annotateSTM should use catchSTM# rather than catch#

A catch# frame inside a transaction breaks retry and async exception
delivery.

Fixes #27657

- - - - -
bb324171 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00
rts: refactor to reduce THREADED_RTS in MSG_UPD_TSO_FLAGS

- No behavior change in this commit (well, a small optimization here
  makes us do less work if the target TSO owned by the curr. capability)
- Move all THREADED_RTS CPP needed into `updThreadFlag`
- Merge MSG_SET_TSO_FLAGS and MSG_UNSET_TSO_FLAGS into MSG_UPD_TSO_FLAGS
  plus a `set` bool field in the MessageUpdTSOFlag struct

Towards #27729

- - - - -
ed99b7b7 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00
rts: Fix race condition in MSG_UPD_TSO_FLAGS execution

The code for processing the MSG_UPD_TSO_FLAGS message was not taking
into consideration that the TSO's owner might have moved in between that
capability receiving the message (since it was its previous owner) and
starting to process its inbox (a point at which it was no longer the
owner)

Added Note [TSO owner may change in between Msg being sent and received]
to explain this race and the pattern used to fix this, where we just
forward the message to the new owner.

Fixes #27729

- - - - -
cd653714 by Alan Zimmerman at 2026-08-26T15:11:49-04:00
EPA: Uses Parsers.parseModule for exactprint tests

Parsers.parseModule is the advertised way to parse for use for exact
printing in the ghc-exactprint library. This commit updates the GHC
exact print testing to use it.

This requires moving the comment balancing that was occurring
only in the test path into the advertising parser path, so it moves
from Transforms.hs to Utils.hs.

Also update the comment adding to honour trailing annotations

- - - - -
d1d01fa5 by Wolfgang Jeltsch at 2026-08-27T13:17:59+03:00
Add `rethrowSTM` and improve STM-related documentation

Adding `rethrowSTM` resolves #26758.

The implementation of `rethrowSTM` is completely analogous to the one of
`rethrowIO`.

The following is established for the documentation of `throwSTM` and
`catchSTM`:

  * Both operations are directly described as analogs of their `IO`
    counterparts.

  * There is no reference to `throw` in the documentation of `throwSTM`,
    because, although such a reference is great in the documentation of
    `throwIO`, it is somewhat out of place in the documentation of
    `throwSTM`.

  * Instead of repeating part of `throwIO`’s documentation, the
    documentation of `throwSTM` just recommends using `throwSTM` instead
    of `throw` and references the corresponding arguments in the
    documentation of `throwIO`.

- - - - -
06fde293 by fendor at 2026-08-28T06:06:44-04:00
GHCi: Fix order of `PackageDBFlag`s for interactive home unit

`PackageDBFlag`s are stored in reverse order of cli specification.
When sorting the `PackageDBFlag`s by longest common prefix, we need thus
to reverse the package db stacks before calculating the prefix.
We make sure to reverse the package db stack for the interactive home
unit to uphold that later specified package dbs overwrite earlier ones.

Resolved and adds regression test for #27640

- - - - -
024c4d04 by fendor at 2026-08-28T06:07:23-04:00
Reuse the UnitIndexCache after initialising multiple home units

- - - - -
55326fa0 by Alan Zimmerman at 2026-08-28T06:08:03-04:00
EPA: Some Haddock processing tweaks

These changes to the Haddock postprocessing should not change
behaviour, but just bring it more closely in line with the
original, changed at 44309cd377f

And add some haddock exactprint tests to show they work.

- - - - -
b3ddee95 by Andreas Klebinger at 2026-08-28T13:57:46-04:00
hadrian: Deprecate quickest flavour.

It was more of a trap for new users than actually beneficial so we
deprecate it and suggest quick+no_dynamic_libs to users instead.

- - - - -
a1d81390 by Andreas Klebinger at 2026-08-28T13:58:37-04:00
cmm: Always favour entry block during block deduplication.

We now always keep the first block in the CmmGraph. This way we avoid
the need to update the entry info table.

Failing to do so caused #27722.

Fixes #27722.

- - - - -
5bd65f00 by Andreas Klebinger at 2026-08-28T13:59:16-04:00
test: FamAppCachePerf - Only collect bytes allocated. Fixes 27747

- - - - -
ced53ce6 by mangoiv at 2026-08-29T07:15:24-04:00
nightlies: output yaml to file only

Previously we would just output the metadata to stdout
which risks that it's clobbered by incidental debugt output.
We now output to file only.

Fixes #27511

- - - - -
578bd185 by Andreas Klebinger at 2026-08-29T07:16:05-04:00
Specialise: Stop looping on recursive dictionaries in interestingDict

interestingDict now doesn't look through loopbreaker unfoldings.
Doing so would cause infinite loops on certain dictionaries.

Fixes #27705.

- - - - -
7bf546fc by Simon Peyton Jones at 2026-08-31T23:48:53-04:00
Never make an absent filler for a constraint type

mkAbsentFiller used isTerminatingType to decide, but that is not enough.
Consider

    class Eq a => UC a where {}

    let u :: UC Int           -- UC Int is a "non-terminating type"
        u = error "Absent"
    let e :: Eq Int           -- Eq Int is a "terminating type"
        e = $p1UC u

We clearly must not make a filler for `e`, because we speculatively
evaluate it. But speculatively evaluating `e` forces `u`, so we must not
make one for `u` either.

Asking isDictTy instead is not enough either, because it does not catch a
constraint hidden behind an unreduced type family application:

    type family F a :: Constraint
    type instance F W = TC W

    a :: F W => Int -> Int      -- (F W) argument is absent

    Oops!  Entered absent arg Arg: irred
    Type: F W

So play safe and use isPredTy: never make an absent filler for any
constraint-kinded type.

Fixes #27627

- - - - -
5f474953 by Zubin Duggal at 2026-08-31T23:48:53-04:00
Add tests for absent fillers at dictionary types

T27627   a unary class whose superclass is a non-unary class
T27627a  ...whose superclass is a Constraint-kinded type family
T27627b  ...whose superclass is a quantified constraint
T27627c  a unary class applied to itself, (UC (UC (TC a)))
T27627e  a (forall b. P b) dictionary that loops

- - - - -
cd5c6bcc by Zubin Duggal at 2026-08-31T23:48:53-04:00
An abstract TyCon may hide a unary class

A class declared in an hs-boot file is an AbstractTyCon inside the
module loop, and compiling the real declaration may reveal it to be a
UnaryClassTyCon.

- isTerminatingType returned True for such AbstractTyCons

- IfaceToCore set the unary flag to False in the DFunId

So we could end up speculating bottom dictionaries because inside a module
loop we see an UnaryClassTyCon as an AbstractTyCon

Use isTerminatingTyCon, which returns False for an abstract TyCon.

The Bool in DFunId is now a cache for isTerminatingTyCon, set in
mkDFunIdDetails.

Fixes #27704

- - - - -
abfc224a by Zubin Duggal at 2026-08-31T23:48:53-04:00
Specialise: don't replace dead args with absent fillers

specHeader decides an argument is dead by calling isDeadBinder on a binder of
the /optimised RHS/, then applies the filler to the /stable unfolding/
template instead. The two may differ, so the argument can be dead in
the RHS and not in the template.

The specialised function's unfolding then has an absent filler, and any call
site that inlines it evaluates the error thunk.

Dropping dead args in the specialiser is rarely worth it, to quote Simon,
"The later worker/wrapper pass will pick up the dead arg later if it is really dead. Keeps the specialiser simpler."

So instead of trying to check if the arg really is dead in the stable unfolding,
just drop the logic for dropping dead args in the specialiser altogeher.

Fixes #27703

- - - - -
1557fd1c by Zubin Duggal at 2026-08-31T23:48:53-04:00
CorePrep: don't speculate a call across an hs-boot edge

We take care not to evaluate things that might be bottom, like a
looping dictionary group, but our analysis is defeated by boot files.
We only track recursion within a module, so two dictionaries that
depend on each other across a module loop each look non-recursive, and
we might speculate them.

Any recursion we cannot see must cross an hs-boot edge, so refuse to
speculate calls that cross one.

Fixes #27717

- - - - -
4117e5ae by Wolfgang Jeltsch at 2026-08-31T23:49:35-04:00
Incorporate the `rethrowSTM` reexport into the `stm` submodule

- - - - -
4bfbf5c8 by ARATA Mizuki at 2026-09-01T18:55:08-04:00
testsuite: Fix out-of-bounds access in T3586

unsafeRead and unsafeWrite use 0-based index.

Looking at #3586, the expected output seems to be 2.8e8.

Addresses #27596

- - - - -
3f9db6d4 by ARATA Mizuki at 2026-09-01T18:55:08-04:00
testsuite: Fix out-of-bounds access in T21305

writeInt64Array# takes an index measured in units of Int64 elements.

Fixes #27596

- - - - -
44d7788f by Simon Peyton Jones at 2026-09-01T18:55:53-04:00
Fix buglet in INLINE-arity calculation for pattern synonyms

This fixes #27744.

The buglet was accidentally introduced by

  commit 3a0f9a51c1dacc474c7fd128082edd8bf4081256
  Author: Simon Peyton Jones <simon.peytonjones@gmail.com>
  Date:   Sat Aug 1 00:13:02 2026 +0100

    Fix three bugs related to required type args and INLINE pragmas

I failed to find all the calls to `addInlinePragArity`!

- - - - -
df058f1d by Simon Jakobi at 2026-09-02T07:18:06-04:00
testsuite: Migrate perf tests off collect_compiler_stats('all')

The 'all' metric argument applies a single tolerance to bytes
allocated, max_bytes_used and peak_megabytes_allocated, although their
noise profiles are incompatible (#27653): allocations are nearly
deterministic, residency needs 10-20%, and peak is quantized to 1 MB.
Any single tolerance is too tight for one metric or too slack for
another. This migrates the remaining users of 'all' (and of the 'all'
default) to explicit per-metric collection, ahead of removing 'all'
from the driver.

peak_megabytes_allocated is dropped everywhere: its 1 MB granularity
makes tight relative windows meaningless (#27613), and it is sensitive
to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved
by less than 0.1%. Where a test guards a memory property,
max_bytes_used covers it at byte granularity.

Where the motivating ticket was about compile-time memory
(T11545, T15304, T26425), residency remains gated via max_bytes_used,
now with a residency-appropriate tolerance.

max_bytes_used is dropped where residency was only ever an accident of
'all':

* T15630, T15630a, T20261: the underlying tickets (#15630, #20261)
  contain no memory data at all. One is a simplifier-ticks blowup and
  the other is stated entirely in allocation numbers, so the 20%
  window never had teeth.

* T21839c: #21839's measurements show residency essentially flat
  (+0.16%) while allocations moved +7%, so allocations are the
  discriminating metric. They are already gated at 1% via
  collect_compiler_runtime. The ghc/max gate had previously broken CI
  spuriously (9fd11585eb widened it from 1% to 10% for that reason).

Allocation tolerances are tightened to the testsuite's conventional 2%
where 'all' previously left them at 10-20%.

Assisted-by: Claude Fable 5

- - - - -
72dd2432 by Simon Jakobi at 2026-09-02T07:18:06-04:00
testsuite: Remove the 'all' metric argument of collect_stats

'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated
at a single tolerance, although their noise profiles are incompatible,
making such tests either flaky or toothless (#27653).

Closes #27653.

Assisted-by: Claude Fable 5

- - - - -
2228cb30 by Simon Jakobi at 2026-09-02T07:18:06-04:00
testsuite: Make the deviation argument of collect_stats mandatory

Almost every caller passes an explicit tolerance matched to the
metric's noise profile, and the silent 20% default is far slacker than
'bytes allocated' merits. Only two tests relied on it. They now state
their tolerance explicitly:

large-project gets 10%, in line with other large compile-time tests.

T9848 gets 2%: its metric is byte-for-byte deterministic across CI
jobs and platforms of a given test_env, has drifted only about 2.5%
since 2015, and the fusion failure it guards against would show up as
a roughly +30000% jump.

Assisted-by: Claude Fable 5

- - - - -
56291fc5 by Cheng Shao at 2026-09-02T07:18:45-04:00
autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23

This commit bumps llvm upper bound to support llvm 23.

- - - - -
20eb3f41 by Cheng Shao at 2026-09-02T07:18:45-04:00
rts: fix compilation issues with clang 23

clang 23 has broadened `-Wall`/`-Wextra` ranges, exposing some minor
issues in the rts when building with validate flavours:

- Unused locals
- `#pragma GCC diagnostic pop` mismatch

This commit fixes those.

- - - - -
9e7739ab by Simon Jakobi at 2026-09-03T13:45:43-04:00
Add -Wimplicit-field-strictness (#16836)

This opt-in warning fires when a data constructor field lacks an
explicit strictness annotation (`!` or `~`).  It complements the
LazyFieldAnnotations extension (4762a8bf30f) from GHC proposal 752,
which makes `~` annotations available for this purpose.

Deciding which fields to report requires their levity, so the check
runs after typechecking.  To keep the noise down, the diagnostic is
emitted once per data declaration, grouped by constructor.

Closes #16836.

Assisted-by: Claude Fable 5

- - - - -
6a44d591 by mangoiv at 2026-09-03T13:46:22-04:00
simplifier: remove a bogus `assert` in `rebuild_app'` in `GHC.CoreToStg.Prep.cpeApp`.

Prior to this commit
    commit 08bc245be70d95801bc1138804ed1de9474fbdc0
    Author: sheaf <sam.derbyshire@gmail.com>
    Date:   Sat Feb 28 16:30:43 2026 +0100

    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

any `PlaceRuntime` ticks we observed were profiling ticks, even though that
isn't necessary.
The more liberal rules in the above commit allow e.g. breakpoint ticks
(which are valid PlaceRuntime ticks) to legitimately appear in an argument
position.

Fixes #27556

- - - - -
eaa95a6f by Andrei Borzenkov at 2026-09-04T08:08:40-04:00
Parentheses in prefix GADT constructors (#27423)

Updated `splitLHsGadtTy` to allow looking
through the parentheses for inner binders. General example
of a code pattern that's allowed now:

  data S a where
    MkS :: (forall a. S a)

That should work now with any combination of nested
foralls and parentheses.

We don't perform parenthesis unwrapping for record
GADT constructors in accordance with GHC Proposal #402.

To this end `con_inner_bndrs` no longer stores plain forall
telescopes: `[HsForAllTelescope pass]` is replaced with
`[LHsGadtTelescope pass]`, a new `HsArg`-style type whose
`HsGadtForAll` holds an inner telescope and whose `HsGadtPar`
holds a pair of parentheses. The parentheses carry no meaning
for renaming or type checking; the only reason to record them
is exact-printing.

Updated `pprConDecl` to improve the `parse == parse . ppr . parse`
property of GADT pretty-printing.

The pretty printer can now output code that's similar to this:

  data T a where
    MkT1 :: (forall a. T a)
    MkT2 :: forall . forall a. T a

These are special cases of inner forall binders
for prefix GADT constructors, when we have either
implicit or zero explicit outer binders.

- - - - -
639456a8 by Evgeny Malyshev at 2026-09-04T08:09:25-04:00
HsPat: Add spacing to unary tuple patterns

Use hsep when printing unary boxed TuplePat applications so that the
MkSolo constructor is separated from its argument. The old hcat rendered
wildcard and parenthesized arguments as MkSolo_ and MkSolo().

Add T27034 to exercise the HsPat splice-dump path with wildcard and
variable arguments, and update existing affected golden output.

Fixes #27034

Assisted-By: OpenAI Codex

- - - - -
2908ab36 by Simon Jakobi at 2026-09-05T07:22:17-04:00
X86 NCG: use btr/bts/btc for single-bit operations

Previously the Cmm patterns

  x & ~(1 << i)
  x | (1 << i)
  x ^ (1 << i)

compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now
they compile to a single btr, bts or btc, matching what C compilers
produce.

When the bit index is a literal, constant folding has already collapsed
these patterns into ones with a literal mask, such as
x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also
compiled to a bit-test instruction when they don't fit in an imm32 and
would otherwise have to be loaded into a register first.

For a variable bit index, this applies only when the shift is unchecked
(uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL
used by e.g. the default clearBit/setBit/complementBit implementations
wraps the shift in a bounds mask that this optimisation does not see
through. With a literal index, the bounds mask is constant-folded away,
so the checked operations benefit too.

See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen.

Fixes #25233.

Assisted-by: Claude Fable 5

- - - - -
c673ecf0 by Simon Peyton Jones at 2026-09-05T07:22:59-04:00
Move HsStatic free-var test to typechecker

A `static` form should have no free *term* variables, but it
can have free *type* variables.  Alas, the renamer does not really know what
is a term variable and what is a type variable, because of required type
arguments. This patch moves the test to the typechecker, which does know.

Addresses #27664

- - - - -
b6ca93c6 by Simon Jakobi at 2026-09-06T02:20:42+02:00
X86 NCG: use 32-bit POPCNT for sub-word popcounts

For MO_PopCnt at W8/W16, use 32-bit POPCNT instead of the 16-bit form.
A 32-bit write zero-extends the result to the full register, so the
separate zero-extension of the result is no longer needed. Also skip
zero-extending the argument when it is visibly already zero-extended,
as in popCount on Word8, which calls popCnt8# on word8ToWord# x.

For the byte-wise popcount loop from #24813 this shrinks the popcount
sequence from 5 instructions to 3.

Assisted-by: Claude Fable 5.1

- - - - -

1575 changed files:

- .gitignore
- .gitlab-ci.yml
- .gitlab/ci.sh
- .gitlab/merge_request_templates/Default.md
- .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py
- + changelog.d/21101
- + changelog.d/27380
- + changelog.d/27532
- + changelog.d/27556
- + changelog.d/27626
- + changelog.d/27627
- + changelog.d/27703
- + changelog.d/27704
- + changelog.d/27717
- + changelog.d/T20363
- + changelog.d/T21628
- + changelog.d/T26423
- + changelog.d/T26532
- + changelog.d/T26716
- + changelog.d/T27123.md
- changelog.d/T27202
- + changelog.d/T27314.md
- + changelog.d/T27329
- + changelog.d/T27360
- + changelog.d/T27368-ppr-unreachable-cmm-blocks.md
- + changelog.d/T27374
- + changelog.d/T27440
- + changelog.d/T27455
- + changelog.d/T27456
- + changelog.d/T27557
- + changelog.d/T27583
- + changelog.d/T27586
- + changelog.d/T27589
- + changelog.d/T27639
- + changelog.d/T27657
- + changelog.d/T27705
- + changelog.d/T27722-cbe-entry-block.md
- + changelog.d/T27744
- + changelog.d/T27764
- + changelog.d/allow-gadt-prefix-con-parens
- + changelog.d/arm_ncg_fixes_T27430
- + changelog.d/downsweep-refactor
- + changelog.d/fix-absent-dict-projection
- + changelog.d/fix-cmm-atomic-load-store
- + changelog.d/fix-cmm-dump-labels
- + changelog.d/fix-heap-census-large-arrays-19048
- + changelog.d/fix-make-install-j
- + changelog.d/fix-peekitbl-no-tntc
- + changelog.d/fix-use-std-ap-thunk
- + changelog.d/implicit-field-strictness-warning
- + changelog.d/inter-module-far-jumps-aarch64-default
- + changelog.d/lazy-field-annotations
- + changelog.d/link-deterministic-order
- + changelog.d/llvm-23
- + changelog.d/ncg-x86-bit-test-instructions
- + changelog.d/refactor-known-names
- + changelog.d/rethrow-stm
- + changelog.d/show-byte-code
- + changelog.d/unit-index
- + changelog.d/warn-defaulted-callstack
- compiler/GHC.hs
- + compiler/GHC/Builtin.hs
- + compiler/GHC/Builtin/KnownKeys.hs
- + compiler/GHC/Builtin/KnownOccs.hs
- + compiler/GHC/Builtin/Modules.hs
- − compiler/GHC/Builtin/Names.hs
- − compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/PrimOps/Casts.hs
- compiler/GHC/Builtin/PrimOps/Ids.hs
- + compiler/GHC/Builtin/TH.hs
- compiler/GHC/Builtin/Uniques.hs
- compiler/GHC/Builtin/Uniques.hs-boot
- − compiler/GHC/Builtin/Utils.hs
- + compiler/GHC/Builtin/WiredIn/Ids.hs
- compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs
- compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs
- compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs
- compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/ByteCode/Breakpoints.hs
- compiler/GHC/ByteCode/Serialize.hs
- + compiler/GHC/ByteCode/Show.hs
- compiler/GHC/ByteCode/Types.hs
- compiler/GHC/Cmm.hs
- compiler/GHC/Cmm/CLabel.hs
- compiler/GHC/Cmm/CommonBlockElim.hs
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- compiler/GHC/Cmm/MachOp.hs
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- compiler/GHC/CmmToAsm/AArch64/CodeGen.hs
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- compiler/GHC/CmmToAsm/AArch64/Ppr.hs
- compiler/GHC/CmmToAsm/Format.hs
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- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/CprAnal.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/LiberateCase.hs
- compiler/GHC/Core/Opt/OccurAnal.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/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/Ppr.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/Ppr.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Data/BooleanFormula.hs
- compiler/GHC/Data/FastString.hs
- compiler/GHC/Data/StringBuffer.hs
- compiler/GHC/Data/Unboxed.hs
- compiler/GHC/Data/Word64Map/Internal.hs
- compiler/GHC/Data/Word64Map/Lazy.hs
- compiler/GHC/Data/Word64Map/Strict.hs
- compiler/GHC/Data/Word64Map/Strict/Internal.hs
- compiler/GHC/Driver/Backend.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/CodeOutput.hs
- compiler/GHC/Driver/Config/StgToCmm.hs
- compiler/GHC/Driver/Config/Tidy.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Env/KnotVars.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Errors/Ppr.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/GenerateCgIPEStub.hs
- compiler/GHC/Driver/Main/Compile.hs
- compiler/GHC/Driver/Main/Hsc.hs
- compiler/GHC/Driver/Main/Interactive.hs
- compiler/GHC/Driver/Main/Passes.hs
- compiler/GHC/Driver/Make.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs.hs
- compiler/GHC/Hs/Basic.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/DocString.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- − compiler/GHC/Hs/Specificity.hs
- compiler/GHC/Hs/Stats.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Breakpoints.hs
- + compiler/GHC/HsToCore/Breakpoints/Types.hs
- compiler/GHC/HsToCore/Docs.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/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Utils.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/ListComp.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match.hs-boot
- compiler/GHC/HsToCore/Match/Constructor.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc/Check.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Ppr.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Ticks.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Usage.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Env.hs
- − compiler/GHC/Iface/Env.hs-boot
- compiler/GHC/Iface/Errors/Ppr.hs
- compiler/GHC/Iface/Errors/Types.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Ext/Types.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Tidy/StaticPtrTable.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/Iface/Warnings.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/HaddockLex.x
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/Lexer.x
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Platform/Ways.hs
- compiler/GHC/Plugins.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/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Context.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Bind.hs
- compiler/GHC/StgToCmm/Config.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Env.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Prim.hs
- compiler/GHC/StgToCmm/Ticky.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/Arg.hs
- compiler/GHC/StgToJS/Expr.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Linker/Utils.hs
- compiler/GHC/StgToJS/Utils.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Functor.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
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- 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/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Class.hs
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- compiler/GHC/Tc/Solver.hs
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- compiler/GHC/Tc/Solver/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Monad.hs
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- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Types/Rank.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Concrete.hs
- compiler/GHC/Tc/Utils/Env.hs
- compiler/GHC/Tc/Utils/Instantiate.hs
- compiler/GHC/Tc/Utils/Monad.hs
- compiler/GHC/Tc/Utils/TcMType.hs
- compiler/GHC/Tc/Utils/TcType.hs
- compiler/GHC/Tc/Utils/Unify.hs
- compiler/GHC/Tc/Validity.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Arity.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/DefaultEnv.hs
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- compiler/GHC/Types/Error.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/FieldLabel.hs
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- compiler/GHC/Types/ForeignCall.hs
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- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.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/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Ppr.hs
- compiler/GHC/Types/Name/Reader.hs
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The diff was not included because it is too large.

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[Git][ghc/ghc][wip/sjakobi/T24813] 217 commits: CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent

Simon Jakobi (＠sjakobi)