July 2026 - ghc-commits

[Git][ghc/ghc][wip/TTG-No-Orphans] 44 commits: driver: enable -finter-module-far-jumps by default
by recursion-ninja (＠recursion-ninja) 20 Jul '26

20 Jul '26

recursion-ninja pushed to branch wip/TTG-No-Orphans at Glasgow Haskell Compiler / GHC Commits: 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 - - - - - 4396a6f2 by Andrea Vezzosi at 2026-07-10T11:09:25-04:00 [Fix #27287] preserve ModBreaks in ModIface - - - - - 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(a)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 - - - - - 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. - - - - - 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(a)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. - - - - - 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(a)openai.com> - - - - - 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(a)openai.com> - - - - - 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(a)openai.com> - - - - - 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 - - - - - 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. - - - - - 0f64f348 by Cheng Shao at 2026-07-16T15:41:08+00:00 ci: add missing docker permission workaround in abi-test job - - - - - 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(a)openai.com> - - - - - 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. - - - - - 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`. - - - - - 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 - - - - - 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(a)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. - - - - - 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! - - - - - 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()). - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - b65ab7b3 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Add a FIXME note in the Poll I/O manager - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 38792843 by Duncan Coutts at 2026-07-18T08:49:13-04:00 Add interruptIOManager support for select I/O manager Uses the FdWakup mechanism. - - - - - 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. - - - - - 7c4258a0 by Recursion Ninja at 2026-07-20T08:47:05-04:00 First pass of orphan instance removal. This is part of a technical debt removal effort made possible now that seperating out the AST via TTG comes 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', 'Outputable', 'Uniquable', etc. The orphan instance of data-types from within 'L.H.S' are having thier orphan instances moved to the module which defined 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 - - - - - 213 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - + changelog.d/T26532 - + changelog.d/T27314.md - + changelog.d/T27329 - + changelog.d/T27360 - + changelog.d/T27374 - + changelog.d/T27456 - + changelog.d/fix-cmm-atomic-load-store - + changelog.d/fix-make-install-j - + changelog.d/fix-use-std-ap-thunk - + changelog.d/inter-module-far-jumps-aarch64-default - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/Core/Coercion/Axiom.hs - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Driver/Config/StgToCmm.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main/Compile.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Basic.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Decls/Overlap.hs - compiler/GHC/Hs/Doc.hs - compiler/GHC/Hs/DocString.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Hs/Instances.hs - − compiler/GHC/Hs/Specificity.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore/Breakpoints.hs - + compiler/GHC/HsToCore/Breakpoints/Types.hs - compiler/GHC/HsToCore/Pmc/Desugar.hs - compiler/GHC/HsToCore/Pmc/Solver.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Recomp.hs - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Platform/Ways.hs - compiler/GHC/Rename/Bind.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Utils.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/StgToCmm/Bind.hs - compiler/GHC/StgToCmm/Config.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Instance/Typeable.hs - compiler/GHC/Tc/Types/Rank.hs - compiler/GHC/ThToHs.hs - compiler/GHC/Types/Basic.hs - compiler/GHC/Types/FieldLabel.hs - compiler/GHC/Types/Fixity.hs - compiler/GHC/Types/ForeignCall.hs - compiler/GHC/Types/InlinePragma.hs - compiler/GHC/Types/Unique.hs - compiler/GHC/Types/Var.hs - compiler/GHC/Unit/Module/ModGuts.hs - compiler/GHC/Unit/Module/ModIface.hs - compiler/GHC/Unit/Module/WholeCoreBindings.hs - compiler/GHC/Utils/Binary.hs - compiler/GHC/Utils/Outputable.hs - compiler/Language/Haskell/Syntax/Basic.hs - compiler/Language/Haskell/Syntax/Binds.hs - compiler/Language/Haskell/Syntax/Decls/Foreign.hs - compiler/Language/Haskell/Syntax/Doc.hs - compiler/Language/Haskell/Syntax/Extension.hs - compiler/Language/Haskell/Syntax/ImpExp.hs - compiler/Language/Haskell/Syntax/Specificity.hs - compiler/ghc.cabal.in - docs/users_guide/expected-undocumented-flags.txt - docs/users_guide/exts/rank_polymorphism.rst - docs/users_guide/exts/static_pointers.rst - docs/users_guide/using-optimisation.rst - ghc/GHCi/UI.hs - hadrian/bindist/Makefile - hadrian/cabal.project - libraries/base/changelog.md - libraries/base/src/System/Environment.hs - libraries/base/tests/T15349.stderr - libraries/ghc-internal/ghc-internal.cabal.in - libraries/ghc-internal/src/GHC/Internal/Event/Control.hs - libraries/ghc-internal/src/GHC/Internal/Event/Manager.hs - libraries/ghc-internal/src/GHC/Internal/Event/TimerManager.hs - libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs - libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs - libraries/ghc-internal/tests/backtraces/T14532b.stdout - nofib - rts/Capability.c - rts/Capability.h - rts/ContinuationOps.cmm - rts/IOManager.c - rts/IOManager.h - rts/IOManagerInternals.h - rts/PrimOps.cmm - rts/RaiseAsync.c - rts/RtsStartup.c - rts/RtsSymbols.c - rts/Schedule.c - rts/Schedule.h - rts/include/rts/IOInterface.h - rts/include/rts/storage/Closures.h - rts/include/rts/storage/TSO.h - rts/posix/FdWakeup.h - + rts/posix/MIO.c - + rts/posix/MIO.h - rts/posix/Poll.c - rts/posix/Poll.h - rts/posix/Select.c - rts/posix/Select.h - rts/posix/Signals.c - rts/posix/Signals.h - rts/posix/Timeout.c - rts/posix/Timeout.h - rts/rts.cabal - rts/sm/NonMovingMark.c - rts/win32/AsyncMIO.c - rts/win32/AsyncMIO.h - rts/win32/AsyncWinIO.h - rts/win32/AwaitEvent.c - rts/win32/AwaitEvent.h - rts/win32/ConsoleHandler.h - rts/win32/MIOManager.h - rts/win32/ThrIOManager.h - rts/win32/WorkQueue.h - rts/win32/veh_excn.h - testsuite/tests/backpack/should_compile/T13149.bkp - testsuite/tests/cmm/should_run/AtomicFetch.hs - testsuite/tests/cmm/should_run/AtomicFetch_cmm.cmm - testsuite/tests/codeGen/should_run/cgrun025.stderr - + testsuite/tests/corelint/T27374.hs - testsuite/tests/corelint/all.T - testsuite/tests/count-deps/CountDepsParser.stdout - testsuite/tests/determinism/determ017/A.hs - testsuite/tests/exceptions/T26759.stderr - testsuite/tests/ghc-e/should_fail/T18441fail7.stderr - testsuite/tests/ghci/scripts/T12005.script - testsuite/tests/ghci/scripts/bytecodeIPE.hs - testsuite/tests/ghci/should_run/Makefile - + testsuite/tests/ghci/should_run/T27287.hs - + testsuite/tests/ghci/should_run/T27287.stdout - 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testsuite/tests/perf/compiler/T3064.hs - + testsuite/tests/pmcheck/should_compile/T27314.hs - + testsuite/tests/pmcheck/should_compile/T27360.hs - testsuite/tests/pmcheck/should_compile/all.T - testsuite/tests/polykinds/T7594.hs - testsuite/tests/printer/Test20297.stdout - testsuite/tests/programs/thurston-modular-arith/Main.hs - testsuite/tests/rts/ipe/IpeStats/Fold.hs - testsuite/tests/runghc/T7859.stderr-mingw32 - testsuite/tests/simplCore/should_compile/T11562.hs - testsuite/tests/simplCore/should_run/T3591.hs - testsuite/tests/typecheck/should_compile/DeepSubsumption02.hs - testsuite/tests/typecheck/should_compile/T12507.hs - testsuite/tests/typecheck/should_compile/T13951.hs - testsuite/tests/typecheck/should_compile/T18920.hs - testsuite/tests/typecheck/should_compile/T2595.hs - testsuite/tests/typecheck/should_compile/T7541.hs - testsuite/tests/typecheck/should_fail/T15067.stderr - + testsuite/tests/typecheck/should_fail/T26532.hs - + testsuite/tests/typecheck/should_fail/T26532.stderr - testsuite/tests/typecheck/should_fail/T6069.stderr - testsuite/tests/typecheck/should_fail/T7368a.hs - testsuite/tests/typecheck/should_fail/T9858b.stderr - testsuite/tests/typecheck/should_fail/TcStaticPointersFail02.stderr - testsuite/tests/typecheck/should_fail/all.T - testsuite/tests/typecheck/should_run/T1735_Help/Basics.hs - testsuite/tests/typecheck/should_run/T3731-short.hs - testsuite/tests/typecheck/should_run/T3731.hs - testsuite/tests/typecheck/should_run/church.hs - testsuite/tests/typecheck/should_run/tcrun008.hs - testsuite/tests/typecheck/should_run/tcrun017.hs - testsuite/tests/typecheck/should_run/tcrun026.hs - testsuite/tests/typecheck/should_run/tcrun035.hs - testsuite/tests/typecheck/should_run/tcrun036.hs - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.hs - utils/deriveConstants/Main.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/bff295f20b167b3cd5a25a8999be8e… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/bff295f20b167b3cd5a25a8999be8e… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/spj-reinstallable-base2] base-exports: ignore GHC.Essentials
by sheaf (＠sheaf) 20 Jul '26

20 Jul '26

sheaf pushed to branch wip/spj-reinstallable-base2 at Glasgow Haskell Compiler / GHC Commits: f2e555a8 by sheaf at 2026-07-20T14:19:04+02:00 base-exports: ignore GHC.Essentials - - - - - 4 changed files: - testsuite/tests/interface-stability/base-exports.stdout - testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs - testsuite/tests/interface-stability/base-exports.stdout-mingw32 - utils/dump-decls/Main.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f2e555a8f35888accc6e80710798548… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f2e555a8f35888accc6e80710798548… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/fendor/external-unit-db-cache] 3 commits: Introduce global package database cache
by Hannes Siebenhandl (＠fendor) 20 Jul '26

20 Jul '26

Hannes Siebenhandl pushed to branch wip/fendor/external-unit-db-cache at Glasgow Haskell Compiler / GHC Commits: 4c881737 by fendor at 2026-07-20T13:13:31+02:00 Introduce global package database cache Add regression test for #26423 Closes #26423 - - - - - d58559ea by fendor at 2026-07-20T13:13:31+02:00 Introduce UnitIndex for global external database caching - - - - - 23ffb266 by fendor at 2026-07-20T14:03:30+02:00 Split State.hs into many more modules - - - - - 42 changed files: - + changelog.d/unit-index - compiler/GHC.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Interactive.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Session/Units.hs - compiler/GHC/Types/Unique.hs - compiler/GHC/Unit/Env.hs - + compiler/GHC/Unit/External/Database.hs - + compiler/GHC/Unit/External/Index.hs - + compiler/GHC/Unit/External/ModuleOrigin.hs - + compiler/GHC/Unit/External/Providers.hs - + compiler/GHC/Unit/External/Query.hs - + compiler/GHC/Unit/External/Substitution.hs - + compiler/GHC/Unit/External/Validate.hs - + compiler/GHC/Unit/External/Visibility.hs - + compiler/GHC/Unit/External/Wired.hs - compiler/GHC/Unit/Home/Graph.hs - compiler/GHC/Unit/Info.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Unit/State.hs-boot - compiler/GHC/Unit/Types.hs - compiler/ghc.cabal.in - ghc/GHCi/UI.hs - hadrian/src/Rules/Generate.hs - testsuite/tests/count-deps/CountDepsParser.stdout - + testsuite/tests/driver/T26423/Hello.hs - + testsuite/tests/driver/T26423/Makefile - + testsuite/tests/driver/T26423/T26423.hs - + testsuite/tests/driver/T26423/T26423.stderr - + testsuite/tests/driver/T26423/T26423.stdout - + testsuite/tests/driver/T26423/all.T - + testsuite/tests/driver/T26423/test/Test.hs - + testsuite/tests/driver/T26423/test/test.pkg - + testsuite/tests/driver/TUnitInfo/Foo.hs - + testsuite/tests/driver/TUnitInfo/Makefile - + testsuite/tests/driver/TUnitInfo/all.T - + testsuite/tests/driver/TUnitInfo/generic-unit-info-space.hs - + testsuite/tests/driver/TUnitInfo/generic-unit-info-space.stdout - utils/haddock/haddock-api/src/Haddock.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5f1f5e4a979d17c03e9b27a3c04afe… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/5f1f5e4a979d17c03e9b27a3c04afe… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/terrorjack/asan] 73 commits: CorePrep: Don't speculatively evaluate bindings that we have already discovered to be absent
by Cheng Shao (＠TerrorJack) 20 Jul '26

20 Jul '26

Cheng Shao pushed to branch wip/terrorjack/asan 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 - - - - - 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 - - - - - 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 - - - - - 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. - - - - - 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(a)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 - - - - - 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(a)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 - - - - - c34e03a7 by Zubin Duggal at 2026-07-09T09:24:58-04:00 testsuite: Fall back to the failure reason for empty JUnit bodies - - - - - 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 - - - - - 4396a6f2 by Andrea Vezzosi at 2026-07-10T11:09:25-04:00 [Fix #27287] preserve ModBreaks in ModIface - - - - - 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(a)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 - - - - - 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. - - - - - 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(a)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. - - - - - 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(a)openai.com> - - - - - 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(a)openai.com> - - - - - 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(a)openai.com> - - - - - 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 - - - - - 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. - - - - - 0f64f348 by Cheng Shao at 2026-07-16T15:41:08+00:00 ci: add missing docker permission workaround in abi-test job - - - - - 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(a)openai.com> - - - - - 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. - - - - - 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`. - - - - - 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 - - - - - 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(a)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. - - - - - 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! - - - - - 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()). - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - b65ab7b3 by Duncan Coutts at 2026-07-18T08:49:12-04:00 Add a FIXME note in the Poll I/O manager - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 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. - - - - - 38792843 by Duncan Coutts at 2026-07-18T08:49:13-04:00 Add interruptIOManager support for select I/O manager Uses the FdWakup mechanism. - - - - - 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. - - - - - dcbefbf3 by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add is-valid-utf8.c to .ubsan-suppressions A minor one in `bytestring` that might surface when building with +ubsan using clang. - - - - - 3cfad4df by Cheng Shao at 2026-07-20T10:57:50+02:00 hadrian: add support for building with AddressSanitizer This patch adds a +asan flavour transformer to hadrian to build all stage1+ C/C++ code with AddressBehaviorSanitizer. This is particularly useful to catch potential out-of-bounds and use-after-free bugs in the RTS codebase. - - - - - 0886abed by Cheng Shao at 2026-07-20T10:57:50+02:00 ci: add ubsan+asan job We now have a `x86_64-linux-fedora43-quick-validate+debug_info+ubsan+asan` validate/nightly job with both UBSan/ASan enabled. This is enabled in full-ci pipelines as well as MR pipelines with `test-sanitizer` label. - - - - - 913a7f30 by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to mblock allocator - - - - - 5b706f91 by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to mgroup allocator - - - - - 00c1e2ac by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to block allocator - - - - - 235ac124 by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to cap->pinned_object_empty - - - - - c1652078 by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to gc_thread->free_blocks - - - - - f2c4ec22 by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to hash table free list - - - - - 8dcef1db by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to per-Task InCall free list - - - - - c0ed3299 by Cheng Shao at 2026-07-20T10:57:50+02:00 rts: add ASAN instrumentation to nonmoving allocator - - - - - 364 changed files: - .gitignore - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/merge_request_templates/Default.md - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - + changelog.d/T21628 - + changelog.d/T26532 - + changelog.d/T27123.md - + changelog.d/T27314.md - + changelog.d/T27329 - + changelog.d/T27360 - + changelog.d/T27374 - + changelog.d/T27456 - + changelog.d/fix-absent-dict-projection - + changelog.d/fix-cmm-atomic-load-store - + changelog.d/fix-make-install-j - + changelog.d/fix-peekitbl-no-tntc - + changelog.d/fix-use-std-ap-thunk - + changelog.d/inter-module-far-jumps-aarch64-default - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Builtin/Utils.hs - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/CLabel.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap.hs - 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testsuite/tests/perf/compiler/hard_hole_fits.stderr - + testsuite/tests/pmcheck/should_compile/T27314.hs - + testsuite/tests/pmcheck/should_compile/T27360.hs - testsuite/tests/pmcheck/should_compile/all.T - testsuite/tests/polykinds/T7594.hs - testsuite/tests/printer/AnnotationNoListTuplePuns.stdout - testsuite/tests/printer/T18791.stderr - testsuite/tests/printer/Test20297.stdout - testsuite/tests/printer/Test24533.stdout - testsuite/tests/programs/thurston-modular-arith/Main.hs - testsuite/tests/rts/T18623/all.T - + testsuite/tests/rts/T27123.hs - testsuite/tests/rts/all.T - testsuite/tests/rts/ipe/IpeStats/Fold.hs - testsuite/tests/runghc/T7859.stderr-mingw32 - testsuite/tests/simplCore/should_compile/DataToTagFamilyScrut.stderr - testsuite/tests/simplCore/should_compile/T11562.hs - testsuite/tests/simplCore/should_compile/T14978.stdout - testsuite/tests/simplCore/should_compile/T18013.stderr - testsuite/tests/simplCore/should_compile/T24229a.stderr - testsuite/tests/simplCore/should_compile/T24229b.stderr - testsuite/tests/simplCore/should_compile/T26615.stderr - testsuite/tests/simplCore/should_run/T3591.hs - testsuite/tests/typecheck/should_compile/DeepSubsumption02.hs - testsuite/tests/typecheck/should_compile/T12507.hs - testsuite/tests/typecheck/should_compile/T13951.hs - testsuite/tests/typecheck/should_compile/T15242.stderr - testsuite/tests/typecheck/should_compile/T18920.hs - testsuite/tests/typecheck/should_compile/T2595.hs - testsuite/tests/typecheck/should_compile/T7541.hs - testsuite/tests/typecheck/should_compile/all.T - testsuite/tests/typecheck/should_fail/T15067.stderr - + testsuite/tests/typecheck/should_fail/T26532.hs - + testsuite/tests/typecheck/should_fail/T26532.stderr - testsuite/tests/typecheck/should_fail/T6069.stderr - testsuite/tests/typecheck/should_fail/T7368a.hs - testsuite/tests/typecheck/should_fail/T9858b.stderr - testsuite/tests/typecheck/should_fail/TcStaticPointersFail02.stderr - testsuite/tests/typecheck/should_fail/all.T - testsuite/tests/typecheck/should_run/T1735_Help/Basics.hs - testsuite/tests/typecheck/should_run/T3731-short.hs - testsuite/tests/typecheck/should_run/T3731.hs - testsuite/tests/typecheck/should_run/church.hs - testsuite/tests/typecheck/should_run/tcrun008.hs - testsuite/tests/typecheck/should_run/tcrun017.hs - testsuite/tests/typecheck/should_run/tcrun026.hs - testsuite/tests/typecheck/should_run/tcrun035.hs - testsuite/tests/typecheck/should_run/tcrun036.hs - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.hs - utils/check-exact/check-exact.cabal - utils/deriveConstants/Main.hs - utils/haddock/haddock-api/haddock-api.cabal - utils/haddock/haddock-api/src/Haddock/Backends/Hyperlinker/Parser.hs - utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs - utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/Interface/Create.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/a79ae1c7a0b69f29804754c114db2d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/a79ae1c7a0b69f29804754c114db2d… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 4 commits: ghc-internal: Lock.hs: fix typo and indentation
by Marge Bot (＠marge-bot) 20 Jul '26

20 Jul '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: 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 - - - - - ec7912cf by Duncan Coutts at 2026-07-20T07:30:41-04:00 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. - - - - - 21 changed files: - + changelog.d/21101 - compiler/GHC/Hs/Utils.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Types/GREInfo.hs - compiler/GHC/Types/Hint.hs - compiler/GHC/Types/Hint/Ppr.hs - libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs - rts/sm/NonMovingMark.c - testsuite/tests/concurrent/should_run/T27105.hs - testsuite/tests/concurrent/should_run/all.T - + testsuite/tests/rename/should_fail/T21101.hs - + testsuite/tests/rename/should_fail/T21101.stderr - testsuite/tests/rename/should_fail/T9815.stderr - testsuite/tests/rename/should_fail/T9815b.stderr - testsuite/tests/rename/should_fail/T9815bghci.stderr - testsuite/tests/rename/should_fail/T9815ghci.stderr - testsuite/tests/rename/should_fail/all.T Changes: ===================================== changelog.d/21101 ===================================== @@ -0,0 +1,8 @@ +section: compiler +synopsis: Improve error messages and hints for invalid record wildcards +description: + 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. +mrs: !8673 +issues: #21101 ===================================== compiler/GHC/Hs/Utils.hs ===================================== @@ -1613,8 +1613,8 @@ hsConDeclsBinders in the following format: with its record fields, in the form of a list of Int indices into... - IntMap FieldOcc, an IntMap of record fields. -(In actual fact, we use [(ConRdrName, Maybe [Located Int])], with Nothing indicating -that the constructor has unlabelled fields: see Note [Local constructor info in the renamer] +(In actual fact, we use [(ConRdrName, Either VisArity [Located Int])], with Left n indicating +that the constructor has n unlabelled arguments: see Note [Local constructor info in the renamer] in GHC.Types.GREInfo.) This allows us to do the following (see GHC.Rename.Names.getLocalNonValBinders.new_tc): @@ -1635,7 +1635,7 @@ Other relevant test cases: rnfail015. -- See Note [Collecting record fields in data declarations]. data LConsWithFields p = LConsWithFields - { consWithFieldIndices :: [(LocatedA (IdP (GhcPass p)), Maybe [Located Int])] + { consWithFieldIndices :: [(LocatedA (IdP (GhcPass p)), Either VisArity [Located Int])] , consFields :: IntMap (LFieldOcc (GhcPass p)) } @@ -1675,16 +1675,15 @@ hsConDeclsBinders cons = go emptyFieldIndices cons LConsWithFields ns fs = go seen' rs get_flds_h98 :: FieldIndices p -> HsConDeclH98Details (GhcPass p) - -> (Maybe [Located Int], FieldIndices p) - get_flds_h98 seen (RecCon _ flds) = first Just $ get_flds seen flds - get_flds_h98 seen (PrefixCon _ []) = (Just [], seen) - get_flds_h98 seen _ = (Nothing, seen) + -> (Either VisArity [Located Int], FieldIndices p) + get_flds_h98 seen (RecCon _ flds) = first Right $ get_flds seen flds + get_flds_h98 seen (PrefixCon _ args) = (Left (length args), seen) + get_flds_h98 seen (InfixCon {}) = (Left 2, seen) get_flds_gadt :: FieldIndices p -> HsConDeclGADTDetails (GhcPass p) - -> (Maybe [Located Int], FieldIndices p) - get_flds_gadt seen (RecConGADT _ flds) = first Just $ get_flds seen flds - get_flds_gadt seen (PrefixConGADT _ []) = (Just [], seen) - get_flds_gadt seen _ = (Nothing, seen) + -> (Either VisArity [Located Int], FieldIndices p) + get_flds_gadt seen (RecConGADT _ flds) = first Right $ get_flds seen flds + get_flds_gadt seen (PrefixConGADT _ args) = (Left (length args), seen) get_flds :: FieldIndices p -> LocatedA [LHsConDeclRecField (GhcPass p)] -> ([Located Int], FieldIndices p) ===================================== compiler/GHC/Rename/Env.hs ===================================== @@ -423,7 +423,12 @@ lookupConstructorInfo qcon@(WithUserRdr _ con_name) = do { info <- lookupGREInfo_GRE con_name ; case info of IAmConLike con_info -> return con_info - UnboundGRE -> return $ ConInfo (ConIsData []) ConHasPositionalArgs + UnboundGRE -> return $ ConInfo (ConIsData []) (ConHasPositionalArgs 0) + -- NB: it's OK to use the dummy value of '0' for the constructor arity: + -- we only use this information for 'TcRnIllegalWildcardsInConstructor', + -- which is an error we don't emit when the constructor is unbound. + -- See GHC.Rename.Pat.rnHsRecFields.rn_dotdot. + IAmTyCon {} -> failIllegalTyCon WL_ConLike qcon _ -> pprPanic "lookupConstructorInfo: not a ConLike" $ vcat [ text "name:" <+> ppr con_name ] ===================================== compiler/GHC/Rename/Names.hs ===================================== @@ -71,7 +71,7 @@ import GHC.Types.FieldLabel import GHC.Types.Hint import GHC.Types.SourceFile import GHC.Types.SrcLoc as SrcLoc -import GHC.Types.Basic ( TyConFlavour (..), convImportLevel ) +import GHC.Types.Basic (TyConFlavour (..), convImportLevel, VisArity) import GHC.Types.Id import GHC.Types.PkgQual import GHC.Types.GREInfo (ConInfo(..), ConFieldInfo (..), ConLikeInfo (ConIsData)) @@ -875,15 +875,16 @@ getLocalNonValBinders fixity_env -- -- The information we needed was all set up for us: -- see Note [Collecting record fields in data declarations] in GHC.Hs.Utils. - mk_fld_env :: [(Name, Maybe [Located Int])] -> IntMap FieldLabel + mk_fld_env :: [(Name, Either VisArity [Located Int])] -> IntMap FieldLabel -> [(ConLikeName, ConInfo)] mk_fld_env names flds = [ (DataConName con, ConInfo (ConIsData (map fst names)) fld_info) - | (con, mb_fl_indxs) <- names - , let fld_info = case fmap (map ((flds IntMap.!) . unLoc)) mb_fl_indxs of - Nothing -> ConHasPositionalArgs - Just [] -> ConIsNullary - Just (fld:flds) -> ConHasRecordFields $ fld NE.:| flds ] + | (con, con_fl_indxs) <- names + , let fld_info = case fmap (map ((flds IntMap.!) . unLoc)) con_fl_indxs of + Left 0 -> ConIsNullary + Left arity -> ConHasPositionalArgs arity + Right [] -> ConIsNullary + Right (fld:flds) -> ConHasRecordFields $ fld NE.:| flds ] new_assoc :: DuplicateRecordFields -> FieldSelectors -> LInstDecl GhcPs -> RnM [GlobalRdrElt] @@ -939,10 +940,10 @@ getLocalNonValBinders fixity_env -- Add errors if a constructor has a duplicate record field. add_dup_fld_errs :: IntMap FieldLabel - -> (Name, Maybe [Located Int]) + -> (Name, Either VisArity [Located Int]) -> IOEnv (Env TcGblEnv TcLclEnv) () - add_dup_fld_errs all_flds (con, mb_con_flds) - | Just con_flds <- mb_con_flds + add_dup_fld_errs all_flds (con, con_flds_or_arity) + | Right con_flds <- con_flds_or_arity , let (_, dups) = removeDups (comparing unLoc) con_flds = for_ dups $ \ dup_flds -> -- Report the error at the location of the second occurrence ===================================== compiler/GHC/Rename/Pat.hs ===================================== @@ -874,7 +874,10 @@ rnHsRecFields ctxt mk_arg (HsRecFields { rec_flds = flds, rec_dotdot = dotdot }) ; checkErr dd_flag (needFlagDotDot ctxt) ; (rdr_env, lcl_env) <- getRdrEnvs ; conInfo <- lookupConstructorInfo qcon - ; when (conFieldInfo conInfo == ConHasPositionalArgs) (addErr (TcRnIllegalWildcardsInConstructor con)) + ; case conFieldInfo conInfo of + ConHasPositionalArgs nbArgs -> + addErr $ TcRnIllegalWildcardsInConstructor (toRecordFieldPart ctxt) con nbArgs + _ -> return () ; let present_flds = mkOccSet $ map rdrNameOcc (getFieldRdrs flds) -- For constructor uses (but not patterns) ===================================== compiler/GHC/Tc/Errors/Ppr.hs ===================================== @@ -357,11 +357,11 @@ instance Diagnostic TcRnMessage where -> mkSimpleDecorated $ vcat [text "Illegal view pattern: " <+> ppr pat] TcRnCharLiteralOutOfRange c -> mkSimpleDecorated $ text "character literal out of range: '\\" <> char c <> char '\'' - TcRnIllegalWildcardsInConstructor con + TcRnIllegalWildcardsInConstructor ctx con _ -> mkSimpleDecorated $ - vcat [ text "Illegal `{..}' notation for constructor" <+> quotes (ppr con) - , nest 2 (text "Record wildcards may not be used for constructors with unlabelled fields.") - , nest 2 (text "Possible fix: Remove the `{..}' and add a match for each field of the constructor.") + vcat [ text "Invalid record" <+> pprRecordFieldPart ctx <+> quotes (ppr con <> text "{..}") <> dot + , text "The data constructor" <+> quotes (ppr con) + <+> text "does not have named record fields." ] TcRnIgnoringAnnotations anns -> mkSimpleDecorated $ @@ -2791,8 +2791,12 @@ instance Diagnostic TcRnMessage where -> [suggestExtension LangExt.ViewPatterns] TcRnCharLiteralOutOfRange{} -> noHints - TcRnIllegalWildcardsInConstructor{} - -> noHints + TcRnIllegalWildcardsInConstructor ctx con arity + -> case ctx of + RecordFieldPattern{} -> [ SuggestEmptyRecordBraces con + , SuggestExplicitConstructorArguments con arity + ] + _ -> [SuggestExplicitConstructorArguments con arity] TcRnIgnoringAnnotations{} -> noHints TcRnAnnotationInSafeHaskell ===================================== compiler/GHC/Tc/Errors/Types.hs ===================================== @@ -818,17 +818,35 @@ data TcRnMessage where TcRnNegativeNumTypeLiteral :: IntegralLit GhcRn -> TcRnMessage {-| TcRnIllegalWildcardsInConstructor is an error that occurs whenever - the record wildcards '..' are used inside a constructor without labeled fields. + the record wildcards '..' are used with a constructor whose fields are + positional (unlabelled). The 'RecordFieldPart' field records whether + the wildcards occurred in a record construction (an expression) or in + a record pattern, so that the message and its suggested fixes can be + worded accordingly. Constructors with no fields at all do not trigger + this error: since GHC proposal 496 ("Nullary record wildcards"), + @C {..}@ is legal for nullary constructors. + Example(s): - Examples(s): None + data D = D Int Bool + + f :: D -> () + f D{..} = () -- record pattern + + g :: D + g = D{..} -- record construction Test cases: rename/should_fail/T9815.hs rename/should_fail/T9815b.hs rename/should_fail/T9815ghci.hs rename/should_fail/T9815bghci.hs + rename/should_fail/T21101.hs -} - TcRnIllegalWildcardsInConstructor :: !Name -> TcRnMessage + TcRnIllegalWildcardsInConstructor + :: !RecordFieldPart -- ^ context in which the constructor application occurs + -> !Name -- ^ name of the constructor + -> !VisArity -- ^ arity of the constructor + -> TcRnMessage {-| TcRnIgnoringAnnotations is a warning that occurs when the source code contains annotation pragmas but the platform in use does not support an ===================================== compiler/GHC/Types/GREInfo.hs ===================================== @@ -244,14 +244,14 @@ instance NFData ConLikeInfo where -- See Note [Local constructor info in the renamer] data ConFieldInfo = ConHasRecordFields (NonEmpty FieldLabel) - | ConHasPositionalArgs + | ConHasPositionalArgs !VisArity | ConIsNullary deriving stock Eq deriving Data instance NFData ConFieldInfo where rnf ConIsNullary = () - rnf ConHasPositionalArgs = () + rnf (ConHasPositionalArgs arity) = rnf arity rnf (ConHasRecordFields flds) = rnf flds mkConInfo :: ConLikeInfo -> VisArity -> [FieldLabel] -> ConInfo @@ -259,9 +259,9 @@ mkConInfo con_ty n flds = ConInfo { conLikeInfo = con_ty , conFieldInfo = mkConFieldInfo n flds } -mkConFieldInfo :: Arity -> [FieldLabel] -> ConFieldInfo +mkConFieldInfo :: VisArity -> [FieldLabel] -> ConFieldInfo mkConFieldInfo 0 _ = ConIsNullary -mkConFieldInfo _ fields = maybe ConHasPositionalArgs ConHasRecordFields +mkConFieldInfo arity fields = maybe (ConHasPositionalArgs arity) ConHasRecordFields $ NonEmpty.nonEmpty fields conInfoFields :: ConInfo -> [FieldLabel] @@ -269,7 +269,7 @@ conInfoFields = conFieldInfoFields . conFieldInfo conFieldInfoFields :: ConFieldInfo -> [FieldLabel] conFieldInfoFields (ConHasRecordFields fields) = NonEmpty.toList fields -conFieldInfoFields ConHasPositionalArgs = [] +conFieldInfoFields (ConHasPositionalArgs _) = [] conFieldInfoFields ConIsNullary = [] instance Outputable ConInfo where @@ -284,7 +284,7 @@ instance Outputable ConLikeInfo where instance Outputable ConFieldInfo where ppr ConIsNullary = text "ConIsNullary" - ppr ConHasPositionalArgs = text "ConHasPositionalArgs" + ppr (ConHasPositionalArgs arity) = text "ConHasPositionalArgs" <+> braces (ppr arity) ppr (ConHasRecordFields fieldLabels) = text "ConHasRecordFields" <+> braces (ppr fieldLabels) ===================================== compiler/GHC/Types/Hint.hs ===================================== @@ -45,7 +45,7 @@ import GHC.Types.InlinePragma (ActivationGhc) import GHC.Types.Name (Name, NameSpace, OccName (occNameFS), isSymOcc, nameOccName) import GHC.Types.Name.Reader (RdrName (Unqual), ImpDeclSpec, GlobalRdrElt) import GHC.Types.SrcLoc (SrcSpan) -import GHC.Types.Basic (RuleName) +import GHC.Types.Basic (RuleName, VisArity) import GHC.Parser.Errors.Basic import GHC.Utils.Outputable import GHC.Data.FastString (fsLit) @@ -548,6 +548,23 @@ data GhcHint | SuggestUpgradeForSemaphoreVersionMismatch !SemaphoreUpgradeTarget !Int -- ^ The 'Int' is the required protocol version. + {-| Suggest replacing a record wildcard pattern @C {..}@ with @C {}@, + which matches a constructor without binding its fields. + + Triggered by 'GHC.Tc.Errors.Types.TcRnIllegalWildcardsInConstructor' + in a record pattern. + -} + | SuggestEmptyRecordBraces !Name + + {-| Suggest applying a constructor directly to its arguments instead + of record syntax, for constructors without labelled fields. + + Triggered by 'GHC.Tc.Errors.Types.TcRnIllegalWildcardsInConstructor' + in a record construction and record patterns. + The 'VisArity' is the number of positional arguments of the constructor. + -} + | SuggestExplicitConstructorArguments !Name !VisArity + -- | What the user should upgrade to resolve an @-jsem@ semaphore -- protocol version mismatch. data SemaphoreUpgradeTarget ===================================== compiler/GHC/Types/Hint/Ppr.hs ===================================== @@ -345,6 +345,12 @@ instance Outputable GhcHint where text "The jobserver uses a newer semaphore protocol than this GHC." $$ (text "Upgrade GHC to a version that supports semaphore protocol v" <> int required <> text " to resolve this.") + SuggestEmptyRecordBraces con + -> text "Use" <+> quotes (ppr con <> text "{}") <+> text "instead," + <+> text "which matches" <+> quotes (ppr con) <+> text "regardless of its fields" + SuggestExplicitConstructorArguments con nbArgs + -> text "Apply" <+> quotes (ppr con) <+> text "to its" + <+> speakNOf nbArgs (text "argument") perhapsAsPat :: SDoc perhapsAsPat = text "Perhaps you meant an as-pattern, which must not be surrounded by whitespace" ===================================== libraries/ghc-internal/src/GHC/Internal/IO/Handle/Lock.hs ===================================== @@ -40,14 +40,14 @@ import GHC.Internal.IO.Handle.Lock.NoOp -- to interrupt it with asynchronous exceptions and/or for other threads to -- continue working, you MUST use threaded version of the runtime system. -- --- 2. The implementation uses relies on any of a number of locking --- facilities, depending upon what the platform supports: +-- 2. The implementation relies on any of a number of locking +-- facilities, depending upon what the platform supports: -- --- * 'LockFileEx' is used on Windows --- * On platforms that support it we use the @F_OFD_SETLK@ and @F_OFD_SETLKW@ @fnctl@s. --- * Otherwise we use @flock@ +-- * 'LockFileEx' is used on Windows +-- * On platforms that support it we use the @F_OFD_SETLK@ and @F_OFD_SETLKW@ @fnctl@s. +-- * Otherwise we use @flock@ -- --- hence all of their caveats also apply here. +-- All of their caveats also apply here. -- -- 3. On non-Windows platforms that don't support 'flock' (e.g. Solaris) this -- function throws 'FileLockingNotImplemented'. We deliberately choose to not ===================================== rts/sm/NonMovingMark.c ===================================== @@ -2018,8 +2018,10 @@ bool nonmovingTidyWeaks (struct MarkQueue_ *queue) // See Note [Weak pointer processing and the non-moving GC] in // MarkWeak.c - bdescr *key_bd = Bdescr((StgPtr) w->key); - bool key_in_nonmoving = HEAP_ALLOCED_GC(w->key) && block_get_flags(key_bd) & BF_NONMOVING; + bool key_in_nonmoving = + HEAP_ALLOCED_GC(w->key) && + block_get_flags(Bdescr((StgPtr) w->key)) & BF_NONMOVING; + if (!key_in_nonmoving || nonmovingIsNowAlive(w->key)) { nonmovingMarkLiveWeak(queue, w); did_work = true; ===================================== testsuite/tests/concurrent/should_run/T27105.hs ===================================== @@ -12,15 +12,19 @@ import Prelude hiding (init) -- Test thread fairness: -- run two cpu-bound threads concurrently for a second, -- each counts how many operations it can perform until signaled to stop --- expect a balance between the two with no more than a 75% imperfection. --- Yes, 75%! On the CI machines we occasionally observe extraordinary levels --- of unfairness: nearly 60% in some cases. We don't want this to become a --- fragile test that is ignored, so we use an extreme bound. This should still --- catch gross breakage. +-- expect a balance between the two with no more than a 30% imperfection. -- --- This _should_ detect if the interval timer is not working, or if thread --- context switching is messed up. We can expect failure if we force a --- contex switch interval of more than half the test time, i.e. more than 0.5s +-- Sadly we have had to mark this test as fragile. On the CI machines we +-- occasionally observe extraordinary levels of unfairness: over 80% in some +-- cases. Having this marked fragile is not ideal, but it's no good having +-- random failures. See issue #27522. +-- +-- People working on the RTS timers, scheduler or capability infrastructure +-- *ought* to check this test is not failing badly in a reproducible way. +-- Doing so should still catch gross breakage. This test _should_ detect if +-- the interval timer is not working, or if thread context switching is messed +-- up. We can expect failure if we force a contex switch interval of more than +-- half the test time, i.e. more than 0.5s. -- -- We run the test twice, with allocating and non-allocating worker threads. -- The -fno-omit-yields above is crucial for worker_nonalloc below, or it never @@ -42,17 +46,16 @@ test worker = do threadDelay 300_000 -- Let them run for 300ms. The default context switch interval is 20ms. -- This gives time for 15 context switches, so this _should_ be enough - -- to get less than 10% unfairness. And on most platforms it is enough. - -- But OSX! Oh OSX! How do I loath thee? Let me count++ the ways. - -- To avoid a fragile test, we use a 75% unfairness threshold. + -- to get less than 10% unfairness. And on most platforms it is enough, + -- but for a bit of robustness we use 30%. putMVar stop () count1 <- takeMVar res1 count2 <- takeMVar res2 let balance :: Double balance = abs ((fromIntegral count1 - fromIntegral count2) / fromIntegral count2) - when (balance > 0.75) $ do - putStrLn "Schedule fairness more than 75% tolerance:" + when (balance > 0.30) $ do + putStrLn "Schedule fairness more than 30% tolerance:" putStrLn $ "imperfection: " ++ show (balance * 100) ++ "%" putStrLn $ "work counts: " ++ show (count1, count2) exitFailure ===================================== testsuite/tests/concurrent/should_run/all.T ===================================== @@ -326,9 +326,10 @@ test('T26341b' , when(arch('wasm32') or arch('javascript'), skip) , compile_and_run, ['-package process']) -# Scheduler (very rough) fairness +# Scheduler fairness test('T27105', [when(arch('wasm32'), skip), # same reason as T367_letnoescape + fragile(27522), run_timeout_multiplier(0.05)], # we expect this to run for ~2s compile_and_run, ['']) test('T27105_fail', ===================================== testsuite/tests/rename/should_fail/T21101.hs ===================================== @@ -0,0 +1,7 @@ +{-# LANGUAGE RecordWildCards #-} +module T21101 where + +data D = D Int Bool + +f :: D -> () +f D{..} = () ===================================== testsuite/tests/rename/should_fail/T21101.stderr ===================================== @@ -0,0 +1,7 @@ +T21101.hs:7:3: error: [GHC-47217] + Invalid record pattern ‘D{..}’. + The data constructor ‘D’ does not have named record fields. + Suggested fixes: + • Use ‘D{}’ instead, which matches ‘D’ regardless of its fields + • Apply ‘D’ to its two arguments + ===================================== testsuite/tests/rename/should_fail/T9815.stderr ===================================== @@ -1,5 +1,5 @@ - T9815.hs:6:13: error: [GHC-47217] - Illegal `{..}' notation for constructor ‘N’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. + Invalid record construction ‘N{..}’. + The data constructor ‘N’ does not have named record fields. + Suggested fix: Apply ‘N’ to its one argument + ===================================== testsuite/tests/rename/should_fail/T9815b.stderr ===================================== @@ -1,5 +1,5 @@ - T9815.hs:6:13: error: [GHC-47217] - Illegal `{..}' notation for constructor ‘N’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. + Invalid record construction ‘N{..}’. + The data constructor ‘N’ does not have named record fields. + Suggested fix: Apply ‘N’ to its one argument + ===================================== testsuite/tests/rename/should_fail/T9815bghci.stderr ===================================== @@ -1,5 +1,5 @@ +<interactive>:5:7: error: [GHC-47217] + Invalid record construction ‘Arg{..}’. + The data constructor ‘Arg’ does not have named record fields. + Suggested fix: Apply ‘Arg’ to its two arguments -<interactive>:5:7: [GHC-47217] - Illegal `{..}' notation for constructor ‘Arg’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. ===================================== testsuite/tests/rename/should_fail/T9815ghci.stderr ===================================== @@ -1,5 +1,5 @@ +<interactive>:3:7: error: [GHC-47217] + Invalid record construction ‘Data.Semigroup.Arg{..}’. + The data constructor ‘Data.Semigroup.Arg’ does not have named record fields. + Suggested fix: Apply ‘Data.Semigroup.Arg’ to its two arguments -<interactive>:3:7: [GHC-47217] - Illegal `{..}' notation for constructor ‘Data.Semigroup.Arg’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. ===================================== testsuite/tests/rename/should_fail/all.T ===================================== @@ -186,6 +186,7 @@ test('T18138', normal, compile_fail, ['']) test('T20147', normal, compile_fail, ['']) test('RnEmptyStatementGroup1', normal, compile_fail, ['']) test('RnImplicitBindInMdoNotation', normal, compile_fail, ['']) +test('T21101', normal, compile_fail, ['']) test('T21605a', normal, compile_fail, ['']) test('T21605b', normal, compile_fail, ['']) test('T21605c', normal, compile_fail, ['']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/622b50f4d6e6f4c1700f9a78c3663e… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/622b50f4d6e6f4c1700f9a78c3663e… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/9.14.2-backports] 5 commits: compiler: refactor error reporting code for ExplicitLevelImports
by Zubin (＠wz1000) 20 Jul '26

20 Jul '26

Zubin pushed to branch wip/9.14.2-backports at Glasgow Haskell Compiler / GHC Commits: 79d89ade by mangoiv at 2026-07-20T14:46:27+05:30 compiler: refactor error reporting code for ExplicitLevelImports Refactors error reporting code for ExplicitLevelImports to pass in a RdrName and a GlobalReaderElt to be able to report errors that are faithful to the source and to more precisely distinguish between names that are in scope from different qualifications. Fixes #27385 and #26616 (cherry picked from commit 141986e3680a24b76e21a7ad4ce6290a7413c7f5) - - - - - 25faabc5 by mangoiv at 2026-07-20T14:46:27+05:30 compiler: rename ZonkAny to UnusedType and add pretty printing logic ZonkAny is a hard to understand name for users who do not know how the compiler works internally. Additionally, it is confusing that ZonkAny, while being a concrete type *represents* a meta variable, espeically in the compiler output. This patch changes the name of ZonkAny to UnusedType which is closer to its intended semantics and adds special pretty printing logic to display this type in the same fashion the compiler displays meta variables in other places, whenever they leak from the implementation to the user. It also exports the type from ghc-internal:GHC.Internal.Types in order to expose documentation. Fixes #27390 Co-Authored-By: Sam Derbyshire <sam.derbyshire(a)gmail.com> (cherry picked from commit a72ff58fa86172b1557e405f7246d27914fdae6e) - - - - - ca3385e0 by Zubin Duggal at 2026-07-20T14:46:27+05:30 hadrian: Remove old package.conf files when generating new ones Old package.conf files might exists with different hashes, causing issues like #26661 Fixes #26661 (cherry picked from commit 5ac9ce7d3821c75e2d2cc17fae00b9e865a02987) - - - - - 5925032e by Zubin Duggal at 2026-07-20T15:15:15+05:30 fixup! compiler: refactor error reporting code for ExplicitLevelImports - - - - - f1233ebb by Zubin Duggal at 2026-07-20T16:24:36+05:30 Prepare 9.14.2 - - - - - 121 changed files: - − changelog.d/T26978 - − changelog.d/T26979 - − changelog.d/T27046 - − changelog.d/T27047 - − changelog.d/T27123.md - − changelog.d/T27124.md - − changelog.d/T27131 - − changelog.d/T27182.md - − changelog.d/T27202 - − changelog.d/T27225 - − changelog.d/T27386 - − changelog.d/bump-process - − changelog.d/deterministic-usage-order - − changelog.d/fix-absent-dict-projection - − changelog.d/fix-blackhole-handling - − changelog.d/fix-cmm-atomic-load-store - − changelog.d/fix-compacting-gc-ap-27434 - − changelog.d/fix-exponential-case-desugar-27383 - − changelog.d/fix-finalizers-27072 - − changelog.d/fix-layout-stack-fcall - − changelog.d/fix-peekitbl-no-tntc - − changelog.d/fix-use-std-ap-thunk - − changelog.d/ghc-pkg-faster-closure - − changelog.d/jobserver-leak-fix - − changelog.d/more-efficient-home-unit-imports-finding - − changelog.d/reexported-module-errors - − changelog.d/semaphore-v2 - − changelog.d/tag-inference-27005 - − changelog.d/wasm-fix-serviceworker - − changelog.d/windows-rethrow-overlapped-exception - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Rename/Splice.hs-boot - compiler/GHC/Rename/Unbound.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Types.hs - compiler/GHC/Tc/Utils/Env.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Name/Reader.hs - docs/users_guide/9.14.2-notes.rst - hadrian/src/Hadrian/Haskell/Cabal/Parse.hs - libraries/base/base.cabal.in - libraries/base/changelog.md - libraries/base/src/GHC/Base.hs - libraries/base/src/GHC/Exts.hs - libraries/ghc-experimental/src/GHC/PrimOps.hs - libraries/ghc-internal/src/GHC/Internal/Types.hs - testsuite/tests/annotations/should_fail/annfail03.stderr - testsuite/tests/annotations/should_fail/annfail04.stderr - testsuite/tests/annotations/should_fail/annfail06.stderr - testsuite/tests/annotations/should_fail/annfail09.stderr - testsuite/tests/interface-stability/ghc-prim-exports.stdout - testsuite/tests/interface-stability/ghc-prim-exports.stdout-mingw32 - testsuite/tests/perf/compiler/T11068.stdout - testsuite/tests/pmcheck/should_compile/T12957.stderr - testsuite/tests/profiling/should_run/staticcallstack002.stdout - testsuite/tests/quasiquotation/qq001/qq001.stderr - testsuite/tests/quasiquotation/qq002/qq002.stderr - testsuite/tests/quasiquotation/qq003/qq003.stderr - testsuite/tests/quasiquotation/qq004/qq004.stderr - testsuite/tests/quotes/LiftErrMsg.stderr - testsuite/tests/quotes/LiftErrMsgDefer.stderr - testsuite/tests/quotes/LiftErrMsgTyped.stderr - testsuite/tests/quotes/T10384.stderr - testsuite/tests/quotes/T5721.stderr - testsuite/tests/quotes/TH_localname.stderr - testsuite/tests/simplCore/should_compile/Makefile - testsuite/tests/simplCore/should_compile/T13156.stdout - testsuite/tests/splice-imports/SI03.stderr - testsuite/tests/splice-imports/SI05.stderr - testsuite/tests/splice-imports/SI08.stderr - testsuite/tests/splice-imports/SI08_oneshot.stderr - testsuite/tests/splice-imports/SI16.stderr - testsuite/tests/splice-imports/SI18.stderr - testsuite/tests/splice-imports/SI20.stderr - testsuite/tests/splice-imports/SI25.stderr - testsuite/tests/splice-imports/SI28.stderr - testsuite/tests/splice-imports/SI29.stderr - testsuite/tests/splice-imports/SI31.stderr - testsuite/tests/splice-imports/SI36.stderr - testsuite/tests/splice-imports/T26088.stderr - testsuite/tests/splice-imports/T26090.stderr - + testsuite/tests/splice-imports/T26616.hs - + testsuite/tests/splice-imports/T26616.stderr - testsuite/tests/splice-imports/all.T - testsuite/tests/th/T16976z.stderr - testsuite/tests/th/T17820a.stderr - testsuite/tests/th/T17820b.stderr - testsuite/tests/th/T17820c.stderr - testsuite/tests/th/T17820d.stderr - testsuite/tests/th/T17820e.stderr - testsuite/tests/th/T21547.stderr - testsuite/tests/th/T23829_hasty.stderr - testsuite/tests/th/T23829_hasty_b.stderr - testsuite/tests/th/T23829_tardy.ghc.stderr - testsuite/tests/th/T26098_local.stderr - testsuite/tests/th/T26098_quote.stderr - testsuite/tests/th/T26098_splice.stderr - testsuite/tests/th/T26099.stderr - testsuite/tests/th/T26568.stderr - testsuite/tests/th/T5795.stderr - testsuite/tests/typecheck/should_fail/T13292.stderr - + testsuite/tests/typecheck/should_fail/T27390-explicit-kinds.stderr - + testsuite/tests/typecheck/should_fail/T27390.hs - + testsuite/tests/typecheck/should_fail/T27390.stderr - + testsuite/tests/typecheck/should_fail/T27390a.hs - testsuite/tests/typecheck/should_fail/all.T The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/4955f0ca4c3d5ffcc967b304481cd6… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/4955f0ca4c3d5ffcc967b304481cd6… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/10.0.1-backports] 33 commits: Don't drop ticks around variables of type `IO ()`
by Zubin (＠wz1000) 20 Jul '26

20 Jul '26

Zubin pushed to branch wip/10.0.1-backports at Glasgow Haskell Compiler / GHC Commits: 69561925 by sheaf at 2026-07-20T14:25:36+05:30 Don't drop ticks around variables of type `IO ()` GHC.Core.Utils.mkTick is responsible for placing a tick on a Core expression. It contains logic for dropping SCCs (non-counting profiling ticks) around non-function variables, as such variables cannot meaningfully contribute to profiles. However, the logic for what counts as a function was incorrect: it used `isFunTy` which returns 'False' for types such as 'IO ()' where the function arrow is hidden under a newtype. We now use 'mightBeFunTy' instead of 'isFunTy'. This ensures we don't drop ticks in cases we aren't sure. On the way, we improve the documentation of 'isFunTy', 'isPiTy' and 'mightBeFunTy', and update the latter's implementation to consistently handle unary classes. Fixes #27225 ------------------------- Metric Decrease: T5642 ------------------------- (cherry picked from commit ce01ccb625514a09e76aded549691da4dfe87de7) - - - - - d035085a by sheaf at 2026-07-20T14:25:43+05:30 Fix crash in Data.Data instance for HsCtxt The Data.Data instance for HsCtxt contained an error for the 'toConstr' method, which could trigger for example when looking at -ddump-tc-ast traces. Replace it with the 'abstractConstr' pattern used in the rest of the codebase. (cherry picked from commit 98c20394e8a130df928272c360199fb5e9265f22) - - - - - 4a70cf55 by sheaf at 2026-07-20T14:25:43+05:30 Fix AArch64 clobbering bug for MUL2 On AArch64, the code generator could clobber one of the input operands when computing the lower bits of a MUL2 operation. This rendered invalid the subsequent computation of the high bits. This commit fixes that by using a temporary register. The register allocator can remove the redundant move in the common case when the registers do not conflict. Fixes #27046 (cherry picked from commit c9015f0953e72829e89ac768b6ad9ece34c7e187) - - - - - f17ccdf3 by sheaf at 2026-07-20T14:25:43+05:30 Add type family performance test for #26426 Some GHC versions produced large numbers of coercions after typechecking and desugaring when compiling the program in #26426: Version | Typechecker time | Typechecker allocations | Coercions -------:|-----------------:|------------------------:|---------: 9.6 | 47 ms | 48 MB | 110k 9.8 | 1000 ms | 486 MB | 10,437k 9.10 | 922 ms | 489 MB | 10,436k 9.12 | 906 ms | 482 MB | 10,437k 9.14 | 63 ms | 55 MB | 333k 10.0 | 47 ms | 64 MB | 35k The improvement 9.12 -> 9.14 was due to commit 22d11fa818fae2c95c494fc0fac1f8cb4c6e7cb6, while the improvement 9.14 -> 10.0 was due to commit 0b7df6db9e46df40e86fbff1a66dc10440b99db5. As the behaviour of GHC seems better than it's ever been on this program, we declare victory, adding this performance test to ensure we don't regress on this program. On the way, we update Note [Combining equalities] in GHC.Tc.SolveR.Equality with the explanation of the 9.12 -> 9.14 improvement (getting rid of an exponential blowup in coercion sizes), and we update Note [Exploiting closed type families] in GHC.Tc.Solver.FunDeps with the explanation of the 9.14 -> 10.0 improvement (bringing down coercion size growth from cubic to quadratic). (cherry picked from commit 40764930f10d73f6ca00dfbbce908f9516d262ce) - - - - - eca8e6eb by mangoiv at 2026-07-20T14:25:48+05:30 libraries/process: bump submodule to v1.6.30.0 - bump the submodule to the appropriate tag - suppress benign warning resulting from the change (cherry picked from commit d9ea2d76545452a7df567b162340079cb024a40c) - - - - - 7aba67c2 by ARATA Mizuki at 2026-07-20T14:25:57+05:30 RISC-V NCG: Zero-extend the result of castFloatToWord32 According to the ISA manual, FMV.X.W sign-extends the result. We need to truncate the result to avoid creating an exotic Word32 value. Fixes #27300 (cherry picked from commit 291ce3aafe4ca3d2562154a28c595a858987d9f1) - - - - - 9dba4f96 by ARATA Mizuki at 2026-07-20T14:25:57+05:30 RISC-V NCG: Treat d28-d31 (ft8-ft11) as caller-saved According to the calling convention, the registers d28-d31 (ft8-ft11) are caller-saved. Fixes #27306 (cherry picked from commit 011be91fdaa7869dff2f30b8f2ecca3c9a713739) - - - - - 4e7a3d23 by ARATA Mizuki at 2026-07-20T14:25:57+05:30 RISC-V NCG: Set rounding mode when emitting `truncate` If we omit the rounding mode for `fcvt`, `dyn` will be used. We do not want that for `truncate`, so we set `rtz`. In other places, we set `rne` because we do not use the dynamic rounding mode. Fixes #27303 (cherry picked from commit e8a547133031b7de8f6f9bbd70a7148eda0941ee) - - - - - b9d78ac1 by Zubin Duggal at 2026-07-20T14:25:57+05:30 rts: fix validate build with gcc 16. `__attribute__((regparm(1)))` is ignored on x86_64 and now gcc warns that it is ignored: rts/sm/Evac.h:35:1: error: error: ‘regparm’ attribute ignored [-Werror=attributes] See https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ccead81bbc39668376eb5cf47066a… Fixes #27366 (cherry picked from commit 9438bec7117433bbc70449d4288f6ee32dbbbec4) - - - - - dfd1dd1b by Ian Duncan at 2026-07-20T14:25:58+05:30 AArch64: use SXTH, not SXTW, for W32 signExtendReg signExtendReg was using SXTH (sign-extend halfword, 16-bit) for W32-to-W64 sign extension. This should be SXTW (sign-extend word, 32-bit). SXTH only sign-extends the lower 16 bits, producing wrong results for 32-bit values whose bit 15 differs from bit 31. Other fixes: - At sub-W64, code gen for MO_S_Mul2 should use W32 registers for SMULL source operands as per the ARM spec (SMULL Xd, Wn, Wm), and not W64. - Ensure signExtendReg uses the source width for the source operand in SXTW/SXTH/SXTB instructions. GNU as requires sxtw Xd,Wn (not sxtw Xd,Xn), while LLVM's integrated assembler on macOS is lenient. - Fix overflow flag computation for `MO_S_Mul2`. The overflow bit was exactly inverted for sub-W64 operands. Fixes #26978 and #27047 (cherry picked from commit 636c1c7ae47495f022affa501ea0a40cb55cd4a4) - - - - - 36de60c2 by Luite Stegeman at 2026-07-20T14:25:58+05:30 tag inference: don't confuse functions with their return values inferTagRhs was mixing up taggedness for closures and return values for function closures. We really shouldn't assign TagTuple to a properly tagged function returning a tuple. We fix this by keeping track of functions (TagFun) separately from values (TagVal) and keeping track of their return value. TagFun is also used for join points. fixes #27005 (cherry picked from commit 7fe4f2ec3ce12ea138177c81a019dcfc148fe5d4) - - - - - caac944f by Sebastian Graf at 2026-07-20T14:26:25+05:30 Desugar a `case` scrutinee only once (#27383, #20251) In `dsExpr` for `HsCase` we desugared the scrutinee /twice/: once to build the Core `case` itself, and again inside `matchWrapper`, which re-desugared the source scrutinee (via `addHsScrutTmCs`) purely to record long-distance information for the pattern-match checker. For a single `case` that is merely wasteful. But for nested cases it is catastrophic. Consider case (case (case e of ... ) of ... ) of ... Desugaring the outer scrutinee desugars the middle `case` twice, each of which desugars the inner `case` twice, and so on. The work doubles at every level, so desugaring takes O(2^n) time in the nesting depth. That is the blowup reported in #27383; it is also what makes the machine-generated program in #20251 take an age to compile. The fix is simple. `matchWrapper` is handed the scrutinee anyway, so we give it the Core expression we have /already/ desugared, and record the long-distance term constraint with `addCoreScrutTmCs` instead of re-desugaring from source. This is just what `matchSinglePatVar` already does for single-pattern matches. So: * `matchWrapper` now takes `Maybe [CoreExpr]` rather than `Maybe [LHsExpr GhcTc]`. * The `HsCase` equation of `dsExpr` passes the already-desugared `core_discrim`; the arrow desugarer passes its match variables. * `addHsScrutTmCs` had no other use, so it is gone. Desugaring is now linear in the nesting depth. (The coverage checker still runs `simpleOptExpr` over each scrutinee, which leaves the total at O(n^2); that is ample.) The long-distance information itself is unchanged: the checker sees precisely the Core that backs the generated code. Test: deSugar/should_compile/T27383 (cherry picked from commit 67d41299be96798702377e6e2b826f9c8e070821) - - - - - 26c22c6e by sheaf at 2026-07-20T14:26:26+05:30 Avoid mkTick in Core Prep breaking ANF (part II) Hotfix for 2f9579765f55b3920ceb2e04995ff41a9d0e2d4e fixing a small oversight in the call to tickTickedExpr from mkTick, in which we improperly recursively called mkTick without passing on the preserve_anf flag. Fixes #27386 (cherry picked from commit 473b97ebc742305f56e30d5b1bbf95b7681312f0) - - - - - 4872ef31 by Simon Hengel at 2026-07-20T15:39:29+05:30 Reference correct package in error messages for reexported modules (fixes #27417) (cherry picked from commit a805b2a25021606b30d250e084d4beecbfac0d0a) - - - - - 9f158de1 by mangoiv at 2026-07-20T15:39:29+05:30 compiler: rename ZonkAny to UnusedType and add pretty printing logic ZonkAny is a hard to understand name for users who do not know how the compiler works internally. Additionally, it is confusing that ZonkAny, while being a concrete type *represents* a meta variable, espeically in the compiler output. This patch changes the name of ZonkAny to UnusedType which is closer to its intended semantics and adds special pretty printing logic to display this type in the same fashion the compiler displays meta variables in other places, whenever they leak from the implementation to the user. It also exports the type from ghc-internal:GHC.Internal.Types in order to expose documentation. Fixes #27390 Co-Authored-By: Sam Derbyshire <sam.derbyshire(a)gmail.com> (cherry picked from commit a72ff58fa86172b1557e405f7246d27914fdae6e) - - - - - 7f19139e by Luite Stegeman at 2026-07-20T15:39:29+05:30 rts: handle large AP closures in compacting GC The function update_fwd_large in the compacting GC could run into an unexpected object with the following error: internal error: update_fwd_large: unknown/strange object 24 Closure type 24 is the AP closure, which was not handled in upd_fwd_large. This patch adds handling them. fixes #27434 (cherry picked from commit cca0d58963f802a8b2e43aa2dbc58592f8ad07bb) - - - - - 34a825d4 by Cheng Shao at 2026-07-20T15:39:29+05:30 compiler: fix missing handling of CmmUnsafeForeignCall node in LayoutStack This patch fixes missing handling of `CmmUnsafeForeignCall` middle node in the `LayoutStack` pass. Before proc-points splitting, this pass computes liveliness of local registers, and spills those alive across a Cmm native call onto the stack. It need to traverse all middle nodes in each block and check whether a local register is an assignee, if so then the previous mapping in `sm_regs` is invalidated and needs to be dropped. However, it didn't handle `CmmUnsafeForeignCall` node which may also assign to a local register. When proc-points splitting is enabled, this can produce an invalid basic block that doesn't properly backup the updated local register to the stack before doing a Cmm call, resulting in completely invalid runtime behavior. The patch also adds a `T27447` regression test. With no-TNTC or with LLVM backend, without the fix the test case would output a stale 0x1111111111111111 value, instead of the expected 0x2222222222222222 output. Fixes #27447. Co-authored-by: Codex <codex(a)openai.com> (cherry picked from commit 3f00f234d0d5b3b3b2a23a5dc70ce372eb9bbdb4) - - - - - 835ed6f2 by mangoiv at 2026-07-20T15:39:29+05:30 ci: retry fetching test metrics Retry fetching test metrics to make the CI not fail if the services is temporarily unavailable (cherry picked from commit b7e24044fde064cb3f0d44c36872a86d024cd7d4) - - - - - 89a634fc by Zubin Duggal at 2026-07-20T15:39:29+05:30 Bump semaphore-compat submodule to 2.0.1 This versions includes some cruicial fixes for darwin (cherry picked from commit 4180af3f71754472dbd49b85179b25fd29bd9998) - - - - - e5b1fab6 by Zubin Duggal at 2026-07-20T15:39:29+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 (cherry picked from commit 9b714c4c833461c621f0a050680848d7248aa57e) - - - - - ebe99a26 by Zubin Duggal at 2026-07-20T15:39:29+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 (cherry picked from commit 4a59b3eece9b7106fcbe73d2d06a49755be4ea8f) - - - - - 2d4a6f31 by Andreas Klebinger at 2026-07-20T15:39:29+05:30 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. (cherry picked from commit ed09895d7de1ca116a561868c151fd825a16ad0c) - - - - - 5775b5ca by Cheng Shao at 2026-07-20T15:39:29+05:30 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(a)openai.com> (cherry picked from commit 67c03eb2c762fdfeb646eb8345341173dd4268b2) - - - - - cb19b6c5 by Andrea Vezzosi at 2026-07-20T15:39:29+05:30 [Fix #27287] preserve ModBreaks in ModIface (cherry picked from commit 4396a6f2a4c7799908e1e0b88a218a51d063fdca) - - - - - e401ef1c by Zubin Duggal at 2026-07-20T15:39:29+05:30 hadrian: Remove old package.conf files when generating new ones Old package.conf files might exists with different hashes, causing issues like #26661 Fixes #26661 (cherry picked from commit 5ac9ce7d3821c75e2d2cc17fae00b9e865a02987) - - - - - 7f50e6d6 by Cheng Shao at 2026-07-20T15:39:29+05:30 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(a)openai.com> (cherry picked from commit eee8ec5b25ef0f83ba4822e7a0a941df7b0bec5f) - - - - - d184ea5d by Cheng Shao at 2026-07-20T15:39:29+05:30 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(a)openai.com> (cherry picked from commit d377e83e51d39a06e1f0bf2e35a923a3210b21a2) - - - - - 2036f996 by Cheng Shao at 2026-07-20T15:39:29+05:30 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(a)openai.com> (cherry picked from commit 8ed038421a20e3e4e681973b2f5098e5bd2144b5) - - - - - 3b82fd7f by Cheng Shao at 2026-07-20T15:39:29+05:30 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(a)openai.com> (cherry picked from commit 5aa7000ae246ae6a706437799338295b5801a629) - - - - - c25a2d92 by Brian McKenna at 2026-07-20T15:39:29+05:30 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 (cherry picked from commit d43a7b7ad90047f1445c88d796ee7b15a0a605d7) - - - - - 42778740 by Ben Gamari at 2026-07-20T15:39:29+05:30 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. (cherry picked from commit ede4b17bdc54c055e44ad95711409c7d1dcb1128) - - - - - cd1fdc26 by Brian McKenna at 2026-07-20T15:39:29+05:30 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 (cherry picked from commit b388d0934c0933c1cdb47226489634e229239d0a) - - - - - 2a27443f by Duncan Coutts at 2026-07-20T15:39:29+05:30 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. (cherry picked from commit 42918646169c7c5ba61912b39b5f5147bf1d255c) - - - - - 202 changed files: - .gitlab/test-metrics.sh - + changelog.d/T26978 - + changelog.d/T27046 - + changelog.d/T27047 - + changelog.d/T27123.md - + changelog.d/T27225 - + changelog.d/T27314.md - + changelog.d/T27359 - + changelog.d/T27360 - + changelog.d/T27386 - + changelog.d/T27456 - + changelog.d/fix-absent-dict-projection - + changelog.d/fix-cmm-atomic-load-store - + changelog.d/fix-compacting-gc-ap-27434 - + changelog.d/fix-exponential-case-desugar-27383 - + changelog.d/fix-layout-stack-fcall - + changelog.d/fix-peekitbl-no-tntc - + changelog.d/fix-use-std-ap-thunk - + changelog.d/hadrian-stale-package-confs-26661 - + changelog.d/reexported-module-errors - changelog.d/semaphore-v2 - + changelog.d/tag-inference-27005 - + changelog.d/unused-type - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/ByteCode/Breakpoints.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/LayoutStack.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/AArch64/Instr.hs - compiler/GHC/CmmToAsm/AArch64/Ppr.hs - compiler/GHC/CmmToAsm/RV64/CodeGen.hs - compiler/GHC/CmmToAsm/RV64/Instr.hs - compiler/GHC/CmmToAsm/RV64/Ppr.hs - compiler/GHC/CmmToAsm/RV64/Regs.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Config/StgToCmm.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Hs/Instances.hs - compiler/GHC/HsToCore/Arrows.hs - compiler/GHC/HsToCore/Breakpoints.hs - + compiler/GHC/HsToCore/Breakpoints/Types.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Pmc.hs - compiler/GHC/HsToCore/Pmc/Desugar.hs - compiler/GHC/HsToCore/Pmc/Solver.hs - compiler/GHC/Iface/Errors.hs - compiler/GHC/Iface/Errors/Ppr.hs - compiler/GHC/Iface/Errors/Types.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Recomp.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/Stg/EnforceEpt.hs - compiler/GHC/Stg/EnforceEpt/Rewrite.hs - compiler/GHC/Stg/EnforceEpt/TagSig.hs - compiler/GHC/Stg/EnforceEpt/Types.hs - compiler/GHC/StgToCmm/Bind.hs - compiler/GHC/StgToCmm/Config.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/FunDeps.hs - compiler/GHC/Tc/Types.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Literal.hs - compiler/GHC/Types/RepType.hs - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Finder/Types.hs - compiler/GHC/Unit/Module/ModGuts.hs - compiler/GHC/Unit/Module/ModIface.hs - compiler/GHC/Unit/Module/WholeCoreBindings.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Utils/Binary.hs - compiler/ghc.cabal.in - ghc/GHCi/UI/Exception.hs - hadrian/src/Hadrian/Haskell/Cabal/Parse.hs - hadrian/src/Settings/Warnings.hs - libraries/base/changelog.md - libraries/base/src/GHC/Base.hs - libraries/base/src/GHC/Exts.hs - libraries/base/tests/T15349.stderr - libraries/ghc-experimental/src/GHC/PrimOps.hs - + libraries/ghc-heap/tests/T27465.hs - + libraries/ghc-heap/tests/T27465.stdout - libraries/ghc-heap/tests/all.T - libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs - libraries/ghc-internal/src/GHC/Internal/Heap/InfoTable.hsc - libraries/ghc-internal/src/GHC/Internal/Heap/InfoTableProf.hsc - libraries/ghc-internal/src/GHC/Internal/Types.hs - libraries/ghc-internal/tests/backtraces/T14532b.stdout - libraries/process - libraries/semaphore-compat - rts/Apply.cmm - rts/ContinuationOps.cmm - rts/PrimOps.cmm - rts/sm/Compact.c - rts/sm/Evac.h - rts/sm/NonMovingMark.c - testsuite/driver/testlib.py - testsuite/tests/cmm/should_run/AtomicFetch.hs - testsuite/tests/cmm/should_run/AtomicFetch_cmm.cmm - + testsuite/tests/cmm/should_run/T27447.hs - 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+ testsuite/tests/simplStg/should_run/T27005a.stdout - testsuite/tests/simplStg/should_run/all.T - testsuite/tests/typecheck/should_fail/T13292.stderr - + testsuite/tests/typecheck/should_fail/T27390-explicit-kinds.stderr - + testsuite/tests/typecheck/should_fail/T27390.hs - + testsuite/tests/typecheck/should_fail/T27390.stderr - + testsuite/tests/typecheck/should_fail/T27390a.hs - testsuite/tests/typecheck/should_fail/all.T The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/207b6cc6a30ad7221fd84ecc319692… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/207b6cc6a30ad7221fd84ecc319692… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/fendor/external-unit-db-cache] 4 commits: Introduce global package database cache
by Hannes Siebenhandl (＠fendor) 20 Jul '26

20 Jul '26

Hannes Siebenhandl pushed to branch wip/fendor/external-unit-db-cache at Glasgow Haskell Compiler / GHC Commits: af42808c by fendor at 2026-07-20T10:42:00+02:00 Introduce global package database cache Add regression test for #26423 Closes #26423 - - - - - 647f9da9 by fendor at 2026-07-20T10:42:20+02:00 Introduce UnitIndex for global external database caching - - - - - 29cff3f8 by fendor at 2026-07-20T11:00:00+02:00 Split State.hs into many more modules - - - - - 5f1f5e4a by fendor at 2026-07-20T12:09:01+02:00 Don't force unnecessarily - - - - - 42 changed files: - + changelog.d/unit-index - compiler/GHC.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Interactive.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Session/Units.hs - compiler/GHC/Types/Unique.hs - compiler/GHC/Unit/Env.hs - + compiler/GHC/Unit/External/Database.hs - + compiler/GHC/Unit/External/Index.hs - + compiler/GHC/Unit/External/ModuleOrigin.hs - + compiler/GHC/Unit/External/Providers.hs - + compiler/GHC/Unit/External/Query.hs - + compiler/GHC/Unit/External/Substitution.hs - + compiler/GHC/Unit/External/Validate.hs - + compiler/GHC/Unit/External/Visibility.hs - + compiler/GHC/Unit/External/Wired.hs - compiler/GHC/Unit/Home/Graph.hs - compiler/GHC/Unit/Info.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Unit/State.hs-boot - compiler/GHC/Unit/Types.hs - compiler/ghc.cabal.in - ghc/GHCi/UI.hs - hadrian/src/Rules/Generate.hs - testsuite/tests/count-deps/CountDepsParser.stdout - + testsuite/tests/driver/T26423/Hello.hs - + testsuite/tests/driver/T26423/Makefile - + testsuite/tests/driver/T26423/T26423.hs - + testsuite/tests/driver/T26423/T26423.stderr - + testsuite/tests/driver/T26423/T26423.stdout - + testsuite/tests/driver/T26423/all.T - + testsuite/tests/driver/T26423/test/Test.hs - + testsuite/tests/driver/T26423/test/test.pkg - + testsuite/tests/driver/TUnitInfo/Foo.hs - + testsuite/tests/driver/TUnitInfo/Makefile - + testsuite/tests/driver/TUnitInfo/all.T - + testsuite/tests/driver/TUnitInfo/generic-unit-info-space.hs - + testsuite/tests/driver/TUnitInfo/generic-unit-info-space.stdout - utils/haddock/haddock-api/src/Haddock.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/913a02a11d8aff4e5318720d71d898… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/913a02a11d8aff4e5318720d71d898… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/21101] Improve error messages for invalid record wildcards
by Sasha Bogicevic (＠Bogicevic) 20 Jul '26

20 Jul '26

Sasha Bogicevic pushed to branch wip/21101 at Glasgow Haskell Compiler / GHC Commits: 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 - - - - - 17 changed files: - + changelog.d/21101 - compiler/GHC/Hs/Utils.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Types/GREInfo.hs - compiler/GHC/Types/Hint.hs - compiler/GHC/Types/Hint/Ppr.hs - + testsuite/tests/rename/should_fail/T21101.hs - + testsuite/tests/rename/should_fail/T21101.stderr - testsuite/tests/rename/should_fail/T9815.stderr - testsuite/tests/rename/should_fail/T9815b.stderr - testsuite/tests/rename/should_fail/T9815bghci.stderr - testsuite/tests/rename/should_fail/T9815ghci.stderr - testsuite/tests/rename/should_fail/all.T Changes: ===================================== changelog.d/21101 ===================================== @@ -0,0 +1,8 @@ +section: compiler +synopsis: Improve error messages and hints for invalid record wildcards +description: + 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. +mrs: !8673 +issues: #21101 ===================================== compiler/GHC/Hs/Utils.hs ===================================== @@ -1613,8 +1613,8 @@ hsConDeclsBinders in the following format: with its record fields, in the form of a list of Int indices into... - IntMap FieldOcc, an IntMap of record fields. -(In actual fact, we use [(ConRdrName, Maybe [Located Int])], with Nothing indicating -that the constructor has unlabelled fields: see Note [Local constructor info in the renamer] +(In actual fact, we use [(ConRdrName, Either VisArity [Located Int])], with Left n indicating +that the constructor has n unlabelled arguments: see Note [Local constructor info in the renamer] in GHC.Types.GREInfo.) This allows us to do the following (see GHC.Rename.Names.getLocalNonValBinders.new_tc): @@ -1635,7 +1635,7 @@ Other relevant test cases: rnfail015. -- See Note [Collecting record fields in data declarations]. data LConsWithFields p = LConsWithFields - { consWithFieldIndices :: [(LocatedA (IdP (GhcPass p)), Maybe [Located Int])] + { consWithFieldIndices :: [(LocatedA (IdP (GhcPass p)), Either VisArity [Located Int])] , consFields :: IntMap (LFieldOcc (GhcPass p)) } @@ -1675,16 +1675,15 @@ hsConDeclsBinders cons = go emptyFieldIndices cons LConsWithFields ns fs = go seen' rs get_flds_h98 :: FieldIndices p -> HsConDeclH98Details (GhcPass p) - -> (Maybe [Located Int], FieldIndices p) - get_flds_h98 seen (RecCon _ flds) = first Just $ get_flds seen flds - get_flds_h98 seen (PrefixCon _ []) = (Just [], seen) - get_flds_h98 seen _ = (Nothing, seen) + -> (Either VisArity [Located Int], FieldIndices p) + get_flds_h98 seen (RecCon _ flds) = first Right $ get_flds seen flds + get_flds_h98 seen (PrefixCon _ args) = (Left (length args), seen) + get_flds_h98 seen (InfixCon {}) = (Left 2, seen) get_flds_gadt :: FieldIndices p -> HsConDeclGADTDetails (GhcPass p) - -> (Maybe [Located Int], FieldIndices p) - get_flds_gadt seen (RecConGADT _ flds) = first Just $ get_flds seen flds - get_flds_gadt seen (PrefixConGADT _ []) = (Just [], seen) - get_flds_gadt seen _ = (Nothing, seen) + -> (Either VisArity [Located Int], FieldIndices p) + get_flds_gadt seen (RecConGADT _ flds) = first Right $ get_flds seen flds + get_flds_gadt seen (PrefixConGADT _ args) = (Left (length args), seen) get_flds :: FieldIndices p -> LocatedA [LHsConDeclRecField (GhcPass p)] -> ([Located Int], FieldIndices p) ===================================== compiler/GHC/Rename/Env.hs ===================================== @@ -423,7 +423,12 @@ lookupConstructorInfo qcon@(WithUserRdr _ con_name) = do { info <- lookupGREInfo_GRE con_name ; case info of IAmConLike con_info -> return con_info - UnboundGRE -> return $ ConInfo (ConIsData []) ConHasPositionalArgs + UnboundGRE -> return $ ConInfo (ConIsData []) (ConHasPositionalArgs 0) + -- NB: it's OK to use the dummy value of '0' for the constructor arity: + -- we only use this information for 'TcRnIllegalWildcardsInConstructor', + -- which is an error we don't emit when the constructor is unbound. + -- See GHC.Rename.Pat.rnHsRecFields.rn_dotdot. + IAmTyCon {} -> failIllegalTyCon WL_ConLike qcon _ -> pprPanic "lookupConstructorInfo: not a ConLike" $ vcat [ text "name:" <+> ppr con_name ] ===================================== compiler/GHC/Rename/Names.hs ===================================== @@ -71,7 +71,7 @@ import GHC.Types.FieldLabel import GHC.Types.Hint import GHC.Types.SourceFile import GHC.Types.SrcLoc as SrcLoc -import GHC.Types.Basic ( TyConFlavour (..), convImportLevel ) +import GHC.Types.Basic (TyConFlavour (..), convImportLevel, VisArity) import GHC.Types.Id import GHC.Types.PkgQual import GHC.Types.GREInfo (ConInfo(..), ConFieldInfo (..), ConLikeInfo (ConIsData)) @@ -875,15 +875,16 @@ getLocalNonValBinders fixity_env -- -- The information we needed was all set up for us: -- see Note [Collecting record fields in data declarations] in GHC.Hs.Utils. - mk_fld_env :: [(Name, Maybe [Located Int])] -> IntMap FieldLabel + mk_fld_env :: [(Name, Either VisArity [Located Int])] -> IntMap FieldLabel -> [(ConLikeName, ConInfo)] mk_fld_env names flds = [ (DataConName con, ConInfo (ConIsData (map fst names)) fld_info) - | (con, mb_fl_indxs) <- names - , let fld_info = case fmap (map ((flds IntMap.!) . unLoc)) mb_fl_indxs of - Nothing -> ConHasPositionalArgs - Just [] -> ConIsNullary - Just (fld:flds) -> ConHasRecordFields $ fld NE.:| flds ] + | (con, con_fl_indxs) <- names + , let fld_info = case fmap (map ((flds IntMap.!) . unLoc)) con_fl_indxs of + Left 0 -> ConIsNullary + Left arity -> ConHasPositionalArgs arity + Right [] -> ConIsNullary + Right (fld:flds) -> ConHasRecordFields $ fld NE.:| flds ] new_assoc :: DuplicateRecordFields -> FieldSelectors -> LInstDecl GhcPs -> RnM [GlobalRdrElt] @@ -939,10 +940,10 @@ getLocalNonValBinders fixity_env -- Add errors if a constructor has a duplicate record field. add_dup_fld_errs :: IntMap FieldLabel - -> (Name, Maybe [Located Int]) + -> (Name, Either VisArity [Located Int]) -> IOEnv (Env TcGblEnv TcLclEnv) () - add_dup_fld_errs all_flds (con, mb_con_flds) - | Just con_flds <- mb_con_flds + add_dup_fld_errs all_flds (con, con_flds_or_arity) + | Right con_flds <- con_flds_or_arity , let (_, dups) = removeDups (comparing unLoc) con_flds = for_ dups $ \ dup_flds -> -- Report the error at the location of the second occurrence ===================================== compiler/GHC/Rename/Pat.hs ===================================== @@ -874,7 +874,10 @@ rnHsRecFields ctxt mk_arg (HsRecFields { rec_flds = flds, rec_dotdot = dotdot }) ; checkErr dd_flag (needFlagDotDot ctxt) ; (rdr_env, lcl_env) <- getRdrEnvs ; conInfo <- lookupConstructorInfo qcon - ; when (conFieldInfo conInfo == ConHasPositionalArgs) (addErr (TcRnIllegalWildcardsInConstructor con)) + ; case conFieldInfo conInfo of + ConHasPositionalArgs nbArgs -> + addErr $ TcRnIllegalWildcardsInConstructor (toRecordFieldPart ctxt) con nbArgs + _ -> return () ; let present_flds = mkOccSet $ map rdrNameOcc (getFieldRdrs flds) -- For constructor uses (but not patterns) ===================================== compiler/GHC/Tc/Errors/Ppr.hs ===================================== @@ -357,11 +357,11 @@ instance Diagnostic TcRnMessage where -> mkSimpleDecorated $ vcat [text "Illegal view pattern: " <+> ppr pat] TcRnCharLiteralOutOfRange c -> mkSimpleDecorated $ text "character literal out of range: '\\" <> char c <> char '\'' - TcRnIllegalWildcardsInConstructor con + TcRnIllegalWildcardsInConstructor ctx con _ -> mkSimpleDecorated $ - vcat [ text "Illegal `{..}' notation for constructor" <+> quotes (ppr con) - , nest 2 (text "Record wildcards may not be used for constructors with unlabelled fields.") - , nest 2 (text "Possible fix: Remove the `{..}' and add a match for each field of the constructor.") + vcat [ text "Invalid record" <+> pprRecordFieldPart ctx <+> quotes (ppr con <> text "{..}") <> dot + , text "The data constructor" <+> quotes (ppr con) + <+> text "does not have named record fields." ] TcRnIgnoringAnnotations anns -> mkSimpleDecorated $ @@ -2791,8 +2791,12 @@ instance Diagnostic TcRnMessage where -> [suggestExtension LangExt.ViewPatterns] TcRnCharLiteralOutOfRange{} -> noHints - TcRnIllegalWildcardsInConstructor{} - -> noHints + TcRnIllegalWildcardsInConstructor ctx con arity + -> case ctx of + RecordFieldPattern{} -> [ SuggestEmptyRecordBraces con + , SuggestExplicitConstructorArguments con arity + ] + _ -> [SuggestExplicitConstructorArguments con arity] TcRnIgnoringAnnotations{} -> noHints TcRnAnnotationInSafeHaskell ===================================== compiler/GHC/Tc/Errors/Types.hs ===================================== @@ -818,17 +818,35 @@ data TcRnMessage where TcRnNegativeNumTypeLiteral :: IntegralLit GhcRn -> TcRnMessage {-| TcRnIllegalWildcardsInConstructor is an error that occurs whenever - the record wildcards '..' are used inside a constructor without labeled fields. + the record wildcards '..' are used with a constructor whose fields are + positional (unlabelled). The 'RecordFieldPart' field records whether + the wildcards occurred in a record construction (an expression) or in + a record pattern, so that the message and its suggested fixes can be + worded accordingly. Constructors with no fields at all do not trigger + this error: since GHC proposal 496 ("Nullary record wildcards"), + @C {..}@ is legal for nullary constructors. + Example(s): - Examples(s): None + data D = D Int Bool + + f :: D -> () + f D{..} = () -- record pattern + + g :: D + g = D{..} -- record construction Test cases: rename/should_fail/T9815.hs rename/should_fail/T9815b.hs rename/should_fail/T9815ghci.hs rename/should_fail/T9815bghci.hs + rename/should_fail/T21101.hs -} - TcRnIllegalWildcardsInConstructor :: !Name -> TcRnMessage + TcRnIllegalWildcardsInConstructor + :: !RecordFieldPart -- ^ context in which the constructor application occurs + -> !Name -- ^ name of the constructor + -> !VisArity -- ^ arity of the constructor + -> TcRnMessage {-| TcRnIgnoringAnnotations is a warning that occurs when the source code contains annotation pragmas but the platform in use does not support an ===================================== compiler/GHC/Types/GREInfo.hs ===================================== @@ -244,14 +244,14 @@ instance NFData ConLikeInfo where -- See Note [Local constructor info in the renamer] data ConFieldInfo = ConHasRecordFields (NonEmpty FieldLabel) - | ConHasPositionalArgs + | ConHasPositionalArgs !VisArity | ConIsNullary deriving stock Eq deriving Data instance NFData ConFieldInfo where rnf ConIsNullary = () - rnf ConHasPositionalArgs = () + rnf (ConHasPositionalArgs arity) = rnf arity rnf (ConHasRecordFields flds) = rnf flds mkConInfo :: ConLikeInfo -> VisArity -> [FieldLabel] -> ConInfo @@ -259,9 +259,9 @@ mkConInfo con_ty n flds = ConInfo { conLikeInfo = con_ty , conFieldInfo = mkConFieldInfo n flds } -mkConFieldInfo :: Arity -> [FieldLabel] -> ConFieldInfo +mkConFieldInfo :: VisArity -> [FieldLabel] -> ConFieldInfo mkConFieldInfo 0 _ = ConIsNullary -mkConFieldInfo _ fields = maybe ConHasPositionalArgs ConHasRecordFields +mkConFieldInfo arity fields = maybe (ConHasPositionalArgs arity) ConHasRecordFields $ NonEmpty.nonEmpty fields conInfoFields :: ConInfo -> [FieldLabel] @@ -269,7 +269,7 @@ conInfoFields = conFieldInfoFields . conFieldInfo conFieldInfoFields :: ConFieldInfo -> [FieldLabel] conFieldInfoFields (ConHasRecordFields fields) = NonEmpty.toList fields -conFieldInfoFields ConHasPositionalArgs = [] +conFieldInfoFields (ConHasPositionalArgs _) = [] conFieldInfoFields ConIsNullary = [] instance Outputable ConInfo where @@ -284,7 +284,7 @@ instance Outputable ConLikeInfo where instance Outputable ConFieldInfo where ppr ConIsNullary = text "ConIsNullary" - ppr ConHasPositionalArgs = text "ConHasPositionalArgs" + ppr (ConHasPositionalArgs arity) = text "ConHasPositionalArgs" <+> braces (ppr arity) ppr (ConHasRecordFields fieldLabels) = text "ConHasRecordFields" <+> braces (ppr fieldLabels) ===================================== compiler/GHC/Types/Hint.hs ===================================== @@ -45,7 +45,7 @@ import GHC.Types.InlinePragma (ActivationGhc) import GHC.Types.Name (Name, NameSpace, OccName (occNameFS), isSymOcc, nameOccName) import GHC.Types.Name.Reader (RdrName (Unqual), ImpDeclSpec, GlobalRdrElt) import GHC.Types.SrcLoc (SrcSpan) -import GHC.Types.Basic (RuleName) +import GHC.Types.Basic (RuleName, VisArity) import GHC.Parser.Errors.Basic import GHC.Utils.Outputable import GHC.Data.FastString (fsLit) @@ -548,6 +548,23 @@ data GhcHint | SuggestUpgradeForSemaphoreVersionMismatch !SemaphoreUpgradeTarget !Int -- ^ The 'Int' is the required protocol version. + {-| Suggest replacing a record wildcard pattern @C {..}@ with @C {}@, + which matches a constructor without binding its fields. + + Triggered by 'GHC.Tc.Errors.Types.TcRnIllegalWildcardsInConstructor' + in a record pattern. + -} + | SuggestEmptyRecordBraces !Name + + {-| Suggest applying a constructor directly to its arguments instead + of record syntax, for constructors without labelled fields. + + Triggered by 'GHC.Tc.Errors.Types.TcRnIllegalWildcardsInConstructor' + in a record construction and record patterns. + The 'VisArity' is the number of positional arguments of the constructor. + -} + | SuggestExplicitConstructorArguments !Name !VisArity + -- | What the user should upgrade to resolve an @-jsem@ semaphore -- protocol version mismatch. data SemaphoreUpgradeTarget ===================================== compiler/GHC/Types/Hint/Ppr.hs ===================================== @@ -345,6 +345,12 @@ instance Outputable GhcHint where text "The jobserver uses a newer semaphore protocol than this GHC." $$ (text "Upgrade GHC to a version that supports semaphore protocol v" <> int required <> text " to resolve this.") + SuggestEmptyRecordBraces con + -> text "Use" <+> quotes (ppr con <> text "{}") <+> text "instead," + <+> text "which matches" <+> quotes (ppr con) <+> text "regardless of its fields" + SuggestExplicitConstructorArguments con nbArgs + -> text "Apply" <+> quotes (ppr con) <+> text "to its" + <+> speakNOf nbArgs (text "argument") perhapsAsPat :: SDoc perhapsAsPat = text "Perhaps you meant an as-pattern, which must not be surrounded by whitespace" ===================================== testsuite/tests/rename/should_fail/T21101.hs ===================================== @@ -0,0 +1,7 @@ +{-# LANGUAGE RecordWildCards #-} +module T21101 where + +data D = D Int Bool + +f :: D -> () +f D{..} = () ===================================== testsuite/tests/rename/should_fail/T21101.stderr ===================================== @@ -0,0 +1,7 @@ +T21101.hs:7:3: error: [GHC-47217] + Invalid record pattern ‘D{..}’. + The data constructor ‘D’ does not have named record fields. + Suggested fixes: + • Use ‘D{}’ instead, which matches ‘D’ regardless of its fields + • Apply ‘D’ to its two arguments + ===================================== testsuite/tests/rename/should_fail/T9815.stderr ===================================== @@ -1,5 +1,5 @@ - T9815.hs:6:13: error: [GHC-47217] - Illegal `{..}' notation for constructor ‘N’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. + Invalid record construction ‘N{..}’. + The data constructor ‘N’ does not have named record fields. + Suggested fix: Apply ‘N’ to its one argument + ===================================== testsuite/tests/rename/should_fail/T9815b.stderr ===================================== @@ -1,5 +1,5 @@ - T9815.hs:6:13: error: [GHC-47217] - Illegal `{..}' notation for constructor ‘N’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. + Invalid record construction ‘N{..}’. + The data constructor ‘N’ does not have named record fields. + Suggested fix: Apply ‘N’ to its one argument + ===================================== testsuite/tests/rename/should_fail/T9815bghci.stderr ===================================== @@ -1,5 +1,5 @@ +<interactive>:5:7: error: [GHC-47217] + Invalid record construction ‘Arg{..}’. + The data constructor ‘Arg’ does not have named record fields. + Suggested fix: Apply ‘Arg’ to its two arguments -<interactive>:5:7: [GHC-47217] - Illegal `{..}' notation for constructor ‘Arg’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. ===================================== testsuite/tests/rename/should_fail/T9815ghci.stderr ===================================== @@ -1,5 +1,5 @@ +<interactive>:3:7: error: [GHC-47217] + Invalid record construction ‘Data.Semigroup.Arg{..}’. + The data constructor ‘Data.Semigroup.Arg’ does not have named record fields. + Suggested fix: Apply ‘Data.Semigroup.Arg’ to its two arguments -<interactive>:3:7: [GHC-47217] - Illegal `{..}' notation for constructor ‘Data.Semigroup.Arg’ - Record wildcards may not be used for constructors with unlabelled fields. - Possible fix: Remove the `{..}' and add a match for each field of the constructor. ===================================== testsuite/tests/rename/should_fail/all.T ===================================== @@ -186,6 +186,7 @@ test('T18138', normal, compile_fail, ['']) test('T20147', normal, compile_fail, ['']) test('RnEmptyStatementGroup1', normal, compile_fail, ['']) test('RnImplicitBindInMdoNotation', normal, compile_fail, ['']) +test('T21101', normal, compile_fail, ['']) test('T21605a', normal, compile_fail, ['']) test('T21605b', normal, compile_fail, ['']) test('T21605c', normal, compile_fail, ['']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c2f6dcd4118d09356e9812a50728864… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c2f6dcd4118d09356e9812a50728864… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/fendor/external-unit-db-cache] 6 commits: Add regression test for #26423
by Hannes Siebenhandl (＠fendor) 20 Jul '26

20 Jul '26

Hannes Siebenhandl pushed to branch wip/fendor/external-unit-db-cache at Glasgow Haskell Compiler / GHC Commits: 510a0c2b by fendor at 2026-07-20T09:25:55+02:00 Add regression test for #26423 - - - - - f5edbf8c by fendor at 2026-07-20T09:25:55+02:00 WIP: introduce external unit database cache - - - - - 5f6610fb by fendor at 2026-07-20T09:41:04+02:00 Never modify UnitInfo for better sharing - - - - - 46b94ad1 by fendor at 2026-07-20T09:42:01+02:00 WIP: Introduce UnitIndex for global data ------------------------- Metric Decrease: MultiComponentModules MultiComponentModulesRecomp MultiComponentModulesRecomp100 mhu-perf ------------------------- - - - - - 5fb5966b by fendor at 2026-07-20T09:45:33+02:00 Split State.hs into many more modules - - - - - 913a02a1 by fendor at 2026-07-20T09:45:35+02:00 Add memory usage regression test for UnitInfo - - - - - 43 changed files: - + changelog.d/unit-index - compiler/GHC.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Interactive.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Session/Units.hs - compiler/GHC/Types/Unique.hs - compiler/GHC/Unit/Env.hs - + compiler/GHC/Unit/External/Database.hs - + compiler/GHC/Unit/External/Index.hs - + compiler/GHC/Unit/External/ModuleOrigin.hs - + compiler/GHC/Unit/External/Providers.hs - + compiler/GHC/Unit/External/Query.hs - + compiler/GHC/Unit/External/Substitution.hs - + compiler/GHC/Unit/External/Validate.hs - + compiler/GHC/Unit/External/Visibility.hs - + compiler/GHC/Unit/External/Wired.hs - compiler/GHC/Unit/Home/Graph.hs - compiler/GHC/Unit/Info.hs - compiler/GHC/Unit/State.hs - compiler/GHC/Unit/State.hs-boot - compiler/GHC/Unit/Types.hs - compiler/ghc.cabal.in - ghc/GHCi/UI.hs - hadrian/src/Rules/Generate.hs - libraries/ghc-boot/GHC/Unit/Database.hs - testsuite/tests/count-deps/CountDepsParser.stdout - + testsuite/tests/driver/T26423/Hello.hs - + testsuite/tests/driver/T26423/Makefile - + testsuite/tests/driver/T26423/T26423.hs - + testsuite/tests/driver/T26423/T26423.stderr - + testsuite/tests/driver/T26423/T26423.stdout - + testsuite/tests/driver/T26423/all.T - + testsuite/tests/driver/T26423/test/Test.hs - + testsuite/tests/driver/T26423/test/test.pkg - + testsuite/tests/driver/TUnitInfo/Foo.hs - + testsuite/tests/driver/TUnitInfo/Makefile - + testsuite/tests/driver/TUnitInfo/all.T - + testsuite/tests/driver/TUnitInfo/generic-unit-info-space.hs - + testsuite/tests/driver/TUnitInfo/generic-unit-info-space.stdout - utils/haddock/haddock-api/src/Haddock.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/de821184b45e877e904e8171779a62… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/de821184b45e877e904e8171779a62… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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