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[Git][ghc/ghc][wip/mangoiv/27672] 68 commits: testsuite: Migrate perf tests off collect_compiler_stats('all')
by Magnus (＠MangoIV) 29 Sep '26

29 Sep '26

Magnus pushed to branch wip/mangoiv/27672 at Glasgow Haskell Compiler / GHC Commits: df058f1d by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Migrate perf tests off collect_compiler_stats('all') The 'all' metric argument applies a single tolerance to bytes allocated, max_bytes_used and peak_megabytes_allocated, although their noise profiles are incompatible (#27653): allocations are nearly deterministic, residency needs 10-20%, and peak is quantized to 1 MB. Any single tolerance is too tight for one metric or too slack for another. This migrates the remaining users of 'all' (and of the 'all' default) to explicit per-metric collection, ahead of removing 'all' from the driver. peak_megabytes_allocated is dropped everywhere: its 1 MB granularity makes tight relative windows meaningless (#27613), and it is sensitive to GC timing. In #27489 it drifted by -5.3% while max_bytes_used moved by less than 0.1%. Where a test guards a memory property, max_bytes_used covers it at byte granularity. Where the motivating ticket was about compile-time memory (T11545, T15304, T26425), residency remains gated via max_bytes_used, now with a residency-appropriate tolerance. max_bytes_used is dropped where residency was only ever an accident of 'all': * T15630, T15630a, T20261: the underlying tickets (#15630, #20261) contain no memory data at all. One is a simplifier-ticks blowup and the other is stated entirely in allocation numbers, so the 20% window never had teeth. * T21839c: #21839's measurements show residency essentially flat (+0.16%) while allocations moved +7%, so allocations are the discriminating metric. They are already gated at 1% via collect_compiler_runtime. The ghc/max gate had previously broken CI spuriously (9fd11585eb widened it from 1% to 10% for that reason). Allocation tolerances are tightened to the testsuite's conventional 2% where 'all' previously left them at 10-20%. Assisted-by: Claude Fable 5 - - - - - 72dd2432 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Remove the 'all' metric argument of collect_stats 'all' gated bytes allocated, max_bytes_used and peak_megabytes_allocated at a single tolerance, although their noise profiles are incompatible, making such tests either flaky or toothless (#27653). Closes #27653. Assisted-by: Claude Fable 5 - - - - - 2228cb30 by Simon Jakobi at 2026-09-02T07:18:06-04:00 testsuite: Make the deviation argument of collect_stats mandatory Almost every caller passes an explicit tolerance matched to the metric's noise profile, and the silent 20% default is far slacker than 'bytes allocated' merits. Only two tests relied on it. They now state their tolerance explicitly: large-project gets 10%, in line with other large compile-time tests. T9848 gets 2%: its metric is byte-for-byte deterministic across CI jobs and platforms of a given test_env, has drifted only about 2.5% since 2015, and the fusion failure it guards against would show up as a roughly +30000% jump. Assisted-by: Claude Fable 5 - - - - - 56291fc5 by Cheng Shao at 2026-09-02T07:18:45-04:00 autoconf/ghc-toolchain: bump llvm upper bound to support llvm 23 This commit bumps llvm upper bound to support llvm 23. - - - - - 20eb3f41 by Cheng Shao at 2026-09-02T07:18:45-04:00 rts: fix compilation issues with clang 23 clang 23 has broadened `-Wall`/`-Wextra` ranges, exposing some minor issues in the rts when building with validate flavours: - Unused locals - `#pragma GCC diagnostic pop` mismatch This commit fixes those. - - - - - 9e7739ab by Simon Jakobi at 2026-09-03T13:45:43-04:00 Add -Wimplicit-field-strictness (#16836) This opt-in warning fires when a data constructor field lacks an explicit strictness annotation (`!` or `~`). It complements the LazyFieldAnnotations extension (4762a8bf30f) from GHC proposal 752, which makes `~` annotations available for this purpose. Deciding which fields to report requires their levity, so the check runs after typechecking. To keep the noise down, the diagnostic is emitted once per data declaration, grouped by constructor. Closes #16836. Assisted-by: Claude Fable 5 - - - - - 6a44d591 by mangoiv at 2026-09-03T13:46:22-04:00 simplifier: remove a bogus `assert` in `rebuild_app'` in `GHC.CoreToStg.Prep.cpeApp`. Prior to this commit commit 08bc245be70d95801bc1138804ed1de9474fbdc0 Author: sheaf <sam.derbyshire(a)gmail.com> Date: Sat Feb 28 16:30:43 2026 +0100 Clean up join points, casts & ticks This commit shores up the logic dealing with casts and ticks occurring in between a join point binding and a jump any `PlaceRuntime` ticks we observed were profiling ticks, even though that isn't necessary. The more liberal rules in the above commit allow e.g. breakpoint ticks (which are valid PlaceRuntime ticks) to legitimately appear in an argument position. Fixes #27556 - - - - - eaa95a6f by Andrei Borzenkov at 2026-09-04T08:08:40-04:00 Parentheses in prefix GADT constructors (#27423) Updated `splitLHsGadtTy` to allow looking through the parentheses for inner binders. General example of a code pattern that's allowed now: data S a where MkS :: (forall a. S a) That should work now with any combination of nested foralls and parentheses. We don't perform parenthesis unwrapping for record GADT constructors in accordance with GHC Proposal #402. To this end `con_inner_bndrs` no longer stores plain forall telescopes: `[HsForAllTelescope pass]` is replaced with `[LHsGadtTelescope pass]`, a new `HsArg`-style type whose `HsGadtForAll` holds an inner telescope and whose `HsGadtPar` holds a pair of parentheses. The parentheses carry no meaning for renaming or type checking; the only reason to record them is exact-printing. Updated `pprConDecl` to improve the `parse == parse . ppr . parse` property of GADT pretty-printing. The pretty printer can now output code that's similar to this: data T a where MkT1 :: (forall a. T a) MkT2 :: forall . forall a. T a These are special cases of inner forall binders for prefix GADT constructors, when we have either implicit or zero explicit outer binders. - - - - - 639456a8 by Evgeny Malyshev at 2026-09-04T08:09:25-04:00 HsPat: Add spacing to unary tuple patterns Use hsep when printing unary boxed TuplePat applications so that the MkSolo constructor is separated from its argument. The old hcat rendered wildcard and parenthesized arguments as MkSolo_ and MkSolo(). Add T27034 to exercise the HsPat splice-dump path with wildcard and variable arguments, and update existing affected golden output. Fixes #27034 Assisted-By: OpenAI Codex - - - - - 2908ab36 by Simon Jakobi at 2026-09-05T07:22:17-04:00 X86 NCG: use btr/bts/btc for single-bit operations Previously the Cmm patterns x & ~(1 << i) x | (1 << i) x ^ (1 << i) compiled to mov/shl/not/and-style sequences of 3-4 instructions. Now they compile to a single btr, bts or btc, matching what C compilers produce. When the bit index is a literal, constant folding has already collapsed these patterns into ones with a literal mask, such as x & 0xfffffeffffffffff for x & ~(1 << 40). Such masks are now also compiled to a bit-test instruction when they don't fit in an imm32 and would otherwise have to be loaded into a register first. For a variable bit index, this applies only when the shift is unchecked (uncheckedShiftL#, Data.Bits.unsafeShiftL): the bounds-checked shiftL used by e.g. the default clearBit/setBit/complementBit implementations wraps the shift in a bounds mask that this optimisation does not see through. With a literal index, the bounds mask is constant-folded away, so the checked operations benefit too. See Note [Bit-test instructions] in GHC.CmmToAsm.X86.CodeGen. Fixes #25233. Assisted-by: Claude Fable 5 - - - - - c673ecf0 by Simon Peyton Jones at 2026-09-05T07:22:59-04:00 Move HsStatic free-var test to typechecker A `static` form should have no free *term* variables, but it can have free *type* variables. Alas, the renamer does not really know what is a term variable and what is a type variable, because of required type arguments. This patch moves the test to the typechecker, which does know. Addresses #27664 - - - - - 5939ceaf by sheaf at 2026-09-05T22:06:18-04:00 Windows: enforce path convention in ./configure As detailed in Note [MSYS paths] in Hadrian.Utilities, the standing convention (using Windows-style paths with forward slashes) is now enforced in ./configure instead of within Hadrian, removing the need for 'cygpath' calls within Hadrian. Fixes #26683 - - - - - a6061455 by sheaf at 2026-09-05T22:06:18-04:00 Hadrian: introduce ExeSpawnPath Specific details about the filepath used to specify the executable to spawn with CreateProcess matters on Windows: whether we use forward or backward slashes, a leading ./, or an absolute path changes how the executable is found. This commit introduces 'ExeSpawnPath' which is a path that is guaranteed to be found when spawning a process. All command invocations now go through this type to ensure the path has been properly sanitised. See Note [NeedCurrentDirectoryForExePath] in Hadrian.Utilities. The same treatment is applied to hsc2hs. Updates hsc2hs submodule. - - - - - e28313e3 by sheaf at 2026-09-05T22:07:06-04:00 Preserve tick ordering in 'tickTickedExpr' 'GHC.Core.Utils.tickTickedExpr' tries to combine a tick 't1' into an existing stack of ticks 't2s'. There are two situations: 1. 't1' is subsumed by a tick in 't2s': drop it. 2. A tick in 't2s' is subsumed by 't1', say 't2'. This commit ensures that in case (2) we keep 't1' on the outside instead of replacing 't2' at its position in the stack. This avoids re-ordering source notes (which was the cause of #27749). This fixes a regression introduced in 2dadf3b0d05. Fixes #27749 - - - - - 3172f557 by sheaf at 2026-09-05T22:07:06-04:00 Consistently prefer local source note ticks GHC.Cmm.DebugBlock.cmmDebugGen (DWARF annotations) and GHC.Stg.Debug.quickSourcePos (-finfo-table-map) both contained logic to prioritise source note ticks from the current module. This commit commons up this logic and propagates it to a third consumer: IPE stack frames, in GHC.Driver.GenerateCgIPEStub. See the new function GHC.Types.Tickish.bestSourceNote. - - - - - 192be0b6 by Luite Stegeman at 2026-09-07T19:43:36-04:00 rts: fix ctoi_tuple_spill_words getting out of sync Fix a few places that were not updating ctoi_tuple_spill_words correctly, leading to corruption/crashes when dealing with large unboxed tuples in bytecode: - captureContinuationAndAbort - findRetryFrameHelper/findAtomicallyFrameHelper - interpretBCO bci_BRK_FUN fixes #27633 - - - - - 604eb43c by Simon Jakobi at 2026-09-07T19:44:15-04:00 Hadrian: don't capture the testsuite driver's output (#27780) a6061455d54 switched the Testsuite RunTest case from Shake's cmd to the cmd' wrapper. cmd' always captures stdout and stderr, and since the caller asks for Exit, it returns without dumping what it captured. As a result the testsuite output no longer appears in CI job logs: failures, performance metrics and the summary were lost with the job. Use cmdExe, the uncaptured cmd, as the other plain-cmd sites in that commit do. Fixes #27780. Assisted-by: Claude Fable 5.1 - - - - - 06eee015 by Luite Stegeman at 2026-09-08T06:03:06+02:00 rts: Fix missing memory barrier in eval_thunk_selector (#27477) unchain_thunk_selectors() was missing an ACQUIRE_LOAD for the indirectee, leading to segfaults and corruption during GC on weakly-ordered architectures. Fixes #27477 - - - - - f8b2bd8f by Alan Zimmerman at 2026-09-08T09:39:12-04:00 EPA Fix HsCmdDo exact print with comments Exact printing of HsCmdDo was ignoring the location for the do statements, and this is an annotation that can have comments in it. Update it so we print the statements as a unit, including any comments. Also add the result of auditing that we capture comments in all needed places, noting that the remaining Anno SrcSpan instances are benign. - - - - - 430967ab by Duncan Coutts at 2026-09-09T11:07:01+01:00 Reorder cmm decls in HeapStackCheck for a better logical grouping And put more section headers in to deliniate the groups. We're about to add more here, so better to organise it first. - - - - - 344080fd by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add raisePrimIOException and add it to RTS<->ghc-internal API The raisePrimIOException is a new helper function that I/O primops will use to help them report I/O errors. This is implemented in Haskell (since that's a lot easier), but has a calling convention that is easy(ish) to use from Cmm in the I/O primops. So we add it to the RTS API struct, and since we'll use it from Cmm we also need a field accessor macro for cmm (in deriveConstants). See the Note about how we cannot have nice things due to async exceptions and thunks preventing us from using catch. - - - - - cfdb3399 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Add new blocking functions for I/O primops See the Note [Thread blocking for new I/O primops], and the Note [Calling convention for raisePrimIOException]. The point is, it will allow us to report synchronous exceptions from I/O primops, and do so much more flexibly. Previously the I/O managers could only report async exceptions and only nullary exceptions. This was OK historically, but no good as we add more I/O managers and expand the range of I/O operations we support. - - - - - f09c09d8 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Change the encoding of results from the I/O manager to I/O primops Previously we just had async continue or heap overflow. We now extend what we can report with synchronous success, and synchronous failure with an errno. See Note [Encoding of result of I/O manager operations] We don't use these two new cases yet, but we will. In particular an epoll I/O manager needs to be able to report synchronous success or failure for waitRead#/waitWrite#. - - - - - 30f074d9 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch waitRead/Write# to use new blocking return frames and update the I/O managers to set the result before resuming the blocked threads. This makes it possible for I/O managers to report synchronous exceptions from the I/O primops, but that will be done in a subsequent commit. - - - - - a8786ced by Duncan Coutts at 2026-09-09T11:07:01+01:00 Switch Poll and Select I/O managers to report sync exceptions rather than using raiseAsync with blockedOnBadFD_closure. This uses the new mechanism in the blocking frame return code to report synchronous exceptions. - - - - - 7a9df79a by Duncan Coutts at 2026-09-09T11:07:01+01:00 Remove now-unused blockedOnBadFD It was previously thrown by the select and poll I/O managers, but now they use raisePrimIOException (with an EBADF errno). - - - - - 6b0424e3 by Duncan Coutts at 2026-09-09T11:07:01+01:00 Improve the docs for delay# waitRead# and waitWrite# Document that the waitRead/Write# can throw exceptions (this was true before too), and that all of them are async exception cancellation points. - - - - - afeb2c30 by Duncan Coutts at 2026-09-09T20:08:58-04:00 Enable printf warnings for trace functions and fix resulting warnings Most of the existing printf-style functions are annotated with attributes to enable gcc/clang warnings for the printf format string, but several trace functions in Trace.h were missing this annotation. Enable them, and fix the resulting warnings. - - - - - 9a442c93 by Alan Zimmerman at 2026-09-09T20:09:36-04:00 EPA: Exact print ConDeclGADT without custom enterAnn !16321 brought in explicit capture of parens in a ConDeclGADT. The ExactPrint update introduced a modification of the fundamental function in exact printing, `enterAnn`, by splitting it into a version allowing injection of functionality normally handled by the ExactPrint class methods. This commit refactors that code, to restore the prior `enterAnn` version, by following the convention in ExactPrint of introducing a helper data structure with its own `ExactPrint` instance to achieve the same effect. - - - - - 4e9297ea by Simon Jakobi at 2026-09-11T08:32:45-04:00 ci: Actually pass --ignore-perf-failures to the testsuite driver 684c0018d9 changed the IGNORE_PERF_FAILURES handling to append to RUNTEST_ARGS with bash array syntax, but the three use sites still expand RUNTEST_ARGS as a scalar, which yields only the first array element. The appended flag was therefore dropped in every job, so perf improvements kept failing Marge Bot batches and master pipelines, contrary to #19562. Append as a string instead, matching the existing --force-colors append in test_hadrian. Fixes #27563. Assisted-by: Claude Fable 5.1 - - - - - 4f78dfdf by Simon Jakobi at 2026-09-11T08:33:24-04:00 testsuite: Give T26537 a 1.5x compile timeout Its -fregs-graph compile step tends to time out in unoptimized builds (#27188, #27776). Assisted-by: Claude Fable 5.1 - - - - - 130286e3 by Alan Zimmerman at 2026-09-11T08:34:08-04:00 EPA: Remove ListBanana / ListParens from AnnListBrackets This is a step towards making AnnList only represent lists of items which can have either braces or layout. - - - - - a9827d13 by Simon Jakobi at 2026-09-11T18:53:32-04:00 Reject ~, UNPACK and multiplicity annotations on type data fields Only `!` was rejected so far. `~`, UNPACK and multiplicity annotations were silently accepted. None of them make sense at the type level, so restriction (R3) of Note [Type data declarations] now covers all of them. Fixes #27732. Assisted-by: Claude Fable 5.1 - - - - - c71d5e23 by Alan Zimmerman at 2026-09-11T18:54:11-04:00 EPA: Add a Note for the exact print main loop - - - - - 7a108e43 by Simon Jakobi at 2026-09-12T18:35:59-04:00 FastString: Drop mkFastStringWith's constructor callback All three callers passed the same callback, a partial application of mkNewFastStringShortByteString to the string being interned. That partial application is allocated as a closure before the table lookup, on the common hit path too, although the callback is needed only after a miss. Drop the parameter and call mkNewFastStringShortByteString directly after a miss. Since nothing is passed "with" anymore, rename the function to internSB. Suggested by Simon PJ in #27528: https://gitlab.haskell.org/ghc/ghc/-/work_items/27528#note_687031 Assisted-by: Claude Fable 5 - - - - - 82c73b22 by Alan Zimmerman at 2026-09-12T18:36:38-04:00 EPA: More targeted HsDo exact print annotation HsDo is multi-purpose, as encoded in its HsDoFlavour field. Some of these are in a layout context (DoExpr, MDoExpr), others are not (ListComp, MonadComp). We are moving towards using AnnList only in layout contexts, so we switch the HsDo TTG annotation from holding an AnnList for this, to holding Either (EpToken "[", EpToken "]") AnnList This also allows us to trim down AnnListBrackets to only have braces or None, thereby opening the door for unification with the existing layout context data type EpLayout. - - - - - 749d2448 by Luite Stegeman at 2026-09-15T14:07:01-04:00 rts: handle large CONSTR 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 1 Closure type 1 is CONSTR. This patch adds cases for CONSTR and CONSTR_NOCAF. This is the same problem as #27434 (large AP closures, fixed by cca0d58963), which missed this case. Fixes #27649 - - - - - 177d6155 by Luite Stegeman at 2026-09-15T14:07:02-04:00 testsuite: fix T27434 test with compacting GC Ensure that the interpreter is actually run with the compacting GC - - - - - 5796aa63 by Luite Stegeman at 2026-09-15T14:07:49-04:00 rts: initialise the stack frame header for mask_frame and apply_mask_frame We must leave the stack in consistent state before jumping to mask_frame or apply_mask_frame because they may result. Failing to do so could lead to a crash if there were waiting exceptions. Fixes #27651 - - - - - 2486cc92 by Simon Peyton Jones at 2026-09-15T14:08:36-04:00 Re-introduce the "weird SpecDict" case In this commit commit f80375dd4945350a1d784e436975b48b9c736eaf Author: Simon Peyton Jones <simon.peytonjones(a)gmail.com> Date: Sun Jun 29 15:26:58 2025 +0100 Refactor of Specialise.hs I removed a test for a dictionary with unbound type variables. This turned out to be wrong; see #27629. So this MR re-introduces it. - - - - - 8e09a46f by Duncan Coutts at 2026-09-15T20:11:35-04:00 Refactor (and rename) removeFromQueues, to simplify I/O managers Rename it to unblockAndAppendToRunQueue which better reflects what it is intended to do. The post-condition for unblockAndAppendToRunQueue is that the TSO is on the run queue or it is in the process of migrating to another cap. Previously it achieved that by always directly adding the TSO to the run queue itself. But this actually made things more complicated for the I/O managers, because it meant they needed a separate code path for notifying for cancellation compared to notifying for completion. The general notification code would always add the TSO to the run queue itself. So the improvement is to allow different cases in unblockAndAppendToRunQueue to achieve the same outcome in different ways: either directly adding to the run queue or calling helper functions that do so themselves. This then allows the new I/O managers to share code between the sync and async cancellation, and to reuse their notifyIOCompletion helpers for cancellation. This avoids a source of bugs where the completion path may be updated but the cancellation path may be forgotten, or similarly in future for sync/async operations. Update all the existing in-RTS I/O managers, and the posix timeout code. - - - - - d668782c by Duncan Coutts at 2026-09-15T20:11:35-04:00 Document that awaitCompletedTimeoutsOrIO expects an empty run queue This was true before but implicit and not relied on much. It's better to be explicit, and allow things to depend on it. - - - - - 11d938bb by Duncan Coutts at 2026-09-15T20:11:35-04:00 Store the I/O opcode and fd in the StgAsyncIOOp This will be useful in several I/O managers and it is handy for logging and debugging. It also doesn't increase the size of the StgAsyncIOOp structure. There was enough spare padding space already. Update the poll I/O manager to set the new fields. Add a helper function to convert the enum IOReadOrWrite into the enum IOOpCode. Also change IOReadOrWrite to be an enum without a typedef, for consistency with other enumerations in IOManager.h - - - - - bfa87882 by Duncan Coutts at 2026-09-15T20:11:36-04:00 Add a new I/O manager based on select() Yes, this is the second such I/O manager, but it is a modern re-implementation based on the new in-RTS I/O manager infrastructure. So it is cleaner and faster than the old select I/O manager. Why do we need another I/O manager based on select? Why isn't the poll() one good enough as a baseline portable unix I/O manager? Because macOS. Apple Inc. is why we cannot have nice things. The man page for poll on macOS documents the fact that it does not work. At least, it does not work for all files. Specifically, it does not work for device files. Whereas macOS select() does work for device files. Aaaaarg! We _do_ want to deprecate and remove the old select I/O manager, but due to macOS we cannot do that until we have a replacement. This is that replacement. Until of course a nice new k-queue I/O manager arrives, which could become the new default for macOS and FreeBSD. Interestingly, this select I/O manager is actually faster than the poll one, on Linix, in some circumstances: specifically when many Haskell threads are waiting on the same fd. The poll I/O manager does O(n) work for n threads waiting on I/O, whereas the select one does O(fds) work for the number of fds that threads are waiting on. Usually this is 1:1, so it's not noticable, but one can concoct extreme benchmarks to show the difference. - - - - - 8e9de15a by Duncan Coutts at 2026-09-15T20:11:36-04:00 Minor updates in the poll I/O manager to keep in sync with select This keeps it in sync with select one. The changes are based on code review while implementing the new select I/O manager. The two I/O managers are so similar in structure that it makes sense to try to minimise the diff between them. This should aid understanding, and fixes to both in future. - - - - - 222668bb by Duncan Coutts at 2026-09-15T20:11:36-04:00 Document the new select I/O manager in the user guide in the RTS section about I/O managers. And add a changelog entry. - - - - - 0f48735b by Cheng Shao at 2026-09-15T20:12:23-04:00 Revert "wasm: workaround WebKit bug in dyld" This reverts commit c9b8465c2c338176fcab9d197e9d31f4aee11f68. The underlying webkit bug has been fixed in https://commits.webkit.org/314219@main. Closes #27564. - - - - - 809294f1 by Luite Stegeman at 2026-09-15T20:13:08-04:00 rts: make stg_threadLabelzh return a valid pointer for unlabeled threads. This fixes a segfault in the GC caused by stg_threadLabelzh returning a 0 pointer in a GC pointer field. stg_threadLabelzh returns a tuple of type (# Int#, ByteArray# #). If a thread has no label, the second field is unused. We must still return a valid heap object pointer. Instead of returning 0, we now return stg_DEAD_SLOT_closure. fixes #27618 - - - - - e2d57026 by Luite Stegeman at 2026-09-15T20:13:54-04:00 JS: fix selector thunk handling fix a bug where entering a selector thunk could lead to a crash if the selected field was still a thunk. fixes #27788 - - - - - 1b4a622f by sheaf at 2026-09-17T02:39:13-04:00 Improvements to type/data family handling This commit makes several improvements to the treatment of type and data families in GHC: - We consistently use "type family" instead of "type synonym family" to avoid a confusion with type synonyms. For example: - OpenSynFamilyTyCon ==> OpenTypeFamilyTyCon - ClosedSynFamilyTyCon => ClosedTypeFamilyTyCon - Various functions that were specific to data families have been renamed to make this clear. For example: - tyConFamInst_maybe ==> tyConDataFamInst_maybe - isFamInstTyCon ==> isDataFamInstTyCon - 'FamTyConFlav' has been refactored so that all closed type families share a single 'ClosedTypeFamilyTyCon' constructor. The corresponding 'IfaceFamTyConFlav' type was updated similarly. This is then used to tidy up the implementation of GHC.Core.FamInstEnv.reduceTyFamApp_maybe. - - - - - c5aa9098 by sheaf at 2026-09-17T02:39:13-04:00 Small refactor of lookupFamInstEnv This commit reworks the code for looking up family instances in GHC.Core.FamInstEnv, reducing duplication a little bit. No change in behaviour. - - - - - a3ad4588 by sheaf at 2026-09-17T02:39:14-04:00 Use a type family for boxing unboxed types This commit overhauls the way in which unboxed types are boxed, as per the updated Note [Boxing constructors] in GHC.Builtin.WiredIn.Types.Box. The main change is to allow boxing to be parametrised by representation, e.g. making 'Box ty' a valid type. We achieve this by implementing 'Box' using a closed type family: newtype Box (a :: TYPE r) = Box (BoxTF r) type BoxTF :: RuntimeRep -> Type type family BoxTF r where BoxTF IntRep = BoxInt BoxTF Int8Rep = BoxInt8 BoxTF WordRep = BoxWord BoxTF LiftedRep = Any @Type BoxTF (TupleRep [r1, r2]) = (BoxTF r1, BoxTF r2) ... BoxTF (SumRep rs) = BoxSum rs This new design solves the following problems: - It allows boxing a type whose 'RuntimeRep' has not yet been determined (e.g. because we only learn the 'RuntimeRep' after constraint solving). That is, 'Box @r a' is a perfectly valid type even if 'r' is an unfilled metavariable. This is a requirement to fix #25065 (in which we need to box a type whose 'RuntimeRep' is only filled in during constraint solving). - It handles boxing of unboxed tuples and unboxed sums, via recursive boxing. See Note [Boxing TupleRep and SumRep] in GHC.Builtin.WiredIn.Types.Box. 'Box', 'BoxTF' and all of the boxing data constructors are defined in a new 'ghc-internal' module, 'GHC.Internal.Box'. This module contains nothing but wired-in declarations, and GHC never loads its interface on account of a wired-in thing (GHC.Builtin.Modules.isWiredInOnlyModule); see Note [Loading instances for wired-in things] in GHC.Iface.Load. The individual boxing data constructors are deliberately left as an internal implementation detail, and not exported. The intended API is via the two new magic 'Id's: box :: forall {r} (a :: TYPE r). a -> Box a unbox :: forall {r} (a :: TYPE r). Box a -> a exported from 'GHC.PrimOps' (in 'ghc-experimental'). The old boxing data types (IntBox, WordBox, FloatBox, DoubleBox, DictBox) are no longer exported from base (CLC proposal #421). We use this new design to consistently desugar: - parallel comprehensions (GHC.HsToCore.ListComp.{deListComp,dsMcStmt}) - then/group/using statements (GHC.HsToCore.ListComp.{dsTransStmt,dsMcStmt}) - recursive do blocks (mdo/rec) (GHC.HsToCore.Expr.dsDo) - arrows (GHC.HsToCore.Arrows) by consistently using 'box'/'unbox' to deal with unboxed types being put into big tuples. We also adapt 'GHC.Tc.Gen.Match.{tcMcStmt,tcDoStmt}' to create fresh /representation-polymorphic/ type variables for the binders that we are going to put into a big tuple (previously, GHC only allowed lifted types in that position). These desugaring of box and unbox is explained in Note [Desugaring box & unbox] in GHC.Core.Make.Box. Roughly speaking, the desugaring looks like: box @r @ty e ==> K e unbox @r @ty e ==> case e of K x -> x where 'K' is the boxing data constructor at RuntimeRep 'r'. It's slightly more complicated than that in practice: we first need to insert a cast (see Note [The canonical type of a RuntimeRep]) using the new 'CanonicalProv' 'UnivCoProvenance', and unboxed tuples/sums need recursive logic explained in Note [box/unbox for unboxed tuples and sums], including a specific 'BoxSum' datatypes for unboxed sum (which also needed a wired-in type-level list indexing type family (!!)). The desugaring happens in two ways: - Occurrences of 'box'/'unbox' emitted by the typechecker are eliminated in the 'ds_app_var' case of GHC.HsToCore.Expr. - Other code that needs to box/unbox emits the appropriate code inline. This includes the big tuple machinery of GHC.Core.Make used by the desugarer (GHC.HsToCore.{Utils,Binds,Arrows,ListComp}) as well as the float-out pass (GHC.Core.Opt.SetLevels). Core Lint checks that no occurrence of 'box'/'unbox' survives desugaring. On the way, we overhaul the litany of big tuple functions by introducing data BigTupleLayout = BoxedElements | BareElements to distinguish the two kinds of "big tuples" that GHC routinely deals with; for example 'mkBigCoreVarTupSolo' becomes 'mkBigCoreVarTup BareElements'. All of this code is moved to the new module GHC.Core.Make.BigTuple. Fixes #20864 #22336 #22473 #25065 #27331 ------------------------- Metric Decrease: T9872a ------------------------- - - - - - 4cf7628a by Evgeny Malyshev at 2026-09-17T02:39:56-04:00 Fix the CompactionFailed documentation link to compact The old Haddock reference links into base instead of ghc-compact. Use an explicit URL because ghc-compact depends on base, not vice versa. Fixes #27558 Assisted-By: OpenAI Codex - - - - - 098bba70 by Facundo Domínguez at 2026-09-17T14:57:41-04:00 Remove the call to hoistFlag from processCmdLineP This call was undesirable because it was causing a reconstruction of the list of flag processors. Even relying on list fusion would not be sufficient because we want to replace the list with a data structure with faster lookups to address #25763. The removal is done in two moves: * We move CmdLineP to CmdLine.hs * Then we move the effect of hoisting to processArgs via a new function hoistEwM - - - - - e01799c7 by Facundo Domínguez at 2026-09-17T14:57:42-04:00 Do not create duplicate flag processors for the -W flag This makes simpler implementing the command line parser with a trie map holding flag processors. If we were to allow duplicate flag processors for any flag, the trie map would need to be a multimap. - - - - - 3875b257 by Facundo Domínguez at 2026-09-17T14:57:42-04:00 Replace the list of flag processors with a trie map in `processArgs` Previously `GHC.Driver.CmdLine.findArg` was called for each command-line argument, doing a linear search on the list of flag processors each time. This was somewhat costly as the list of flag processor has near 2000 elements. A lookup with a trie map is faster in general, but the speed up is only noticeable when calling `GHC.Driver.CmdLine.processArgs` sufficient times, so the amount of lookups piles up. This could happen in large projects with many units each having many dependencies. If only a module needs to be recompiled, the user still needs to wait for all of the flag parsing to complete. The benchmark at testsuite/tests/perf/compiler/cmdline-parser shows a 10x speed up when using the trie. The trie map is implemented in `GHC.Data.StringTrie`. The design is explained in Note [Processing command line argument fast] in GHC.Driver.Session. The commit also: * adds two property-based tests for trie map operations, * adds a benchmark of the command line parser, and * renames the predicate `arg_ok` to `valid_flag_suffix` to decide what flag processor should be used when there are multiple matching prefixes on a flag. Fixes #25763. - - - - - 5236634a by Andreas Klebinger at 2026-09-17T14:58:24-04:00 Compile Word64{Map,Set} with -O2 always. This is the hottest code and even if we build GHC with -O0 otherwise -O2 pays off for these modules. Fixes #27814. - - - - - 545fd4fb by ARATA Mizuki at 2026-09-22T15:03:24-04:00 Change the C types of hs_{bitrev,bswap}{16,32} to match the Haskell types bitReverse{16,32}# and byteSwap{16,32}# have the type Word# -> Word#, but their C correspondents took and returned StgWord{16,32}. The mismatch on bitReverse16# led to the problem reported in #27299. Although no similar issue is reported for bitReverse32# and byteSwap{16,32}#, it seemed wise to change them proactively. This commit fixes the mismatch by changing the C type. Fixes #27299 - - - - - bf17f289 by fendor at 2026-09-22T15:04:05-04:00 Don't lose instances from shadowed imported modules with the same name When we look for instances below the current module, we need to check the unit id as well when we check for whether the module is the current module, otherwise we ignore modules we import that have the same name as the import module. Adds regression test. - - - - - 53eead15 by Wolfgang Jeltsch at 2026-09-24T20:12:03-04:00 Correct the documentation of `explicitUnits` Resolves #27787. - - - - - 35bf6f4b by Simon Jakobi at 2026-09-24T20:12:49-04:00 Remove stale specHeader bullet from Note [Don't make fillers for constraint types] The Note said that Specialise.specHeader also calls mkAbsentFiller. abfc224a27c removed that call: the specialiser no longer drops dead arguments at all, see Note [Do not drop dead args from specialisations] in GHC.Core.Opt.Specialise. Assisted-by: Claude Fable 5.1 - - - - - 1abef1ef by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00 Improve the `mhu-closure` makefile - - - - - a79a68ea by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00 Make `ghci-multi` hide all unneeded packages - - - - - d6e72450 by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00 Improve the definition of the home unit closure property - - - - - c9a2766d by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00 Re-implement the home unit closure check Compared to the previous implementation, the new one has the following advantages: * It is correct. - It distinguishes between units that have the same unit ID but different ABI hashes. - When `-hide-all-packages` is not used, it considers as home unit dependencies also units that are made implicitly available because they are in the package database. * It seems to be faster in usual settings. - In particular, it does not have a preparation phase in which it merges the dependency information from all home units, so that its running time does not grow linearly with the size of the package database in normal Cabal scenarios. * It is (hopefully) clearer. * It is better documented. - - - - - fa96acf8 by Wolfgang Jeltsch at 2026-09-25T17:02:07-04:00 Remove erroneous GHC flag in `hadrian-multi` The flag was `-Werror=-Wno-error=incomplete-record-selectors`. Its purpose was to permit incomplete record selectors, but because of the illegal combination of `-Werror=` and `-Wno-error` it was ignored, without any negative consequences. - - - - - 9f48a5b9 by Alan Zimmerman at 2026-09-25T17:02:50-04:00 EPA: Add specific layout field to AnnList Up to now AnnList has effectively served to represent lists of things having layout, regardless of whether they do or not. In Haskell, layout is optional in many places, as there is also an alternative syntax using braces and semi-colons, which is free-form. This commit introduces AnnListLayout, a data structure capturing this distinction. It is deliberately set up similarly to EpLayout, so that these two can be merged in time. The transition is done mechanically, where AnnListBraces is not used yet, the original Nothing case maps to AnnListNoLayout, and the Just case to AnnListLayout. Later commits will fine tune these against the actual parser layout. - - - - - ae260fb6 by mangoiv at 2026-09-29T15:01:26+02:00 configure: fix sed script and subst tooldir script Fixes #27672 Metric Decrease: LinkableUsage01 MultiLayerModulesTH_OneShot T10547 T12234 T12425 T13035 T13820 T18140 T18730 T18923 T9198 TcPlugin_RewritePerf mhu-perf - - - - - 394 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - + changelog.d/25763-cmdline-opt - + changelog.d/26610 - + changelog.d/27556 - + changelog.d/27732 - + changelog.d/T27629 - + changelog.d/T27749 - + changelog.d/T27764 - + changelog.d/T27788-js-selector - + changelog.d/allow-gadt-prefix-con-parens - + changelog.d/boxing-family - + changelog.d/clc-421 - + changelog.d/fix-compacting-gc-constr-27649 - + changelog.d/fix-control0-mask-trampoline - + changelog.d/fix-parallel-gc-selector-race-27477 - + changelog.d/fix-threadlabel-segfault-27618 - + changelog.d/implicit-field-strictness-warning - changelog.d/lazy-field-annotations - + changelog.d/llvm-23 - 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testsuite/tests/module/mod185.stderr - testsuite/tests/parser/should_compile/DumpParsedAst.stderr - testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr - testsuite/tests/parser/should_compile/DumpRenamedAst.stderr - testsuite/tests/parser/should_compile/DumpSemis.stderr - testsuite/tests/parser/should_compile/KindSigs.stderr - testsuite/tests/parser/should_compile/T15279.stderr - testsuite/tests/parser/should_compile/T20718.stderr - testsuite/tests/parser/should_compile/T20846.stderr - + testsuite/tests/perf/compiler/T25763.stderr - testsuite/tests/perf/compiler/all.T - testsuite/tests/perf/compiler/large-project/all.T - testsuite/tests/perf/space_leaks/all.T - + testsuite/tests/primops/should_run/T27299.hs - + testsuite/tests/primops/should_run/T27299.stdout - testsuite/tests/primops/should_run/all.T - testsuite/tests/printer/Makefile - + testsuite/tests/printer/T27423c.hs - testsuite/tests/printer/Test20297.stdout - testsuite/tests/printer/Test24533.stdout - testsuite/tests/printer/all.T - testsuite/tests/rename/should_fail/RnStaticPointersFail01.stderr - testsuite/tests/rename/should_fail/RnStaticPointersFail03.stderr - testsuite/tests/rename/should_fail/T26545.stderr - + testsuite/tests/rts/T27477.hs - + testsuite/tests/rts/T27477.stdout - + testsuite/tests/rts/T27618.hs - + testsuite/tests/rts/T27618.stdout - + testsuite/tests/rts/T27649.hs - + testsuite/tests/rts/T27649.stdout - testsuite/tests/rts/all.T - + testsuite/tests/rts/continuations/T27651.hs - + testsuite/tests/rts/continuations/T27651.stdout - testsuite/tests/rts/continuations/all.T - testsuite/tests/simplCore/should_compile/Makefile - + testsuite/tests/simplCore/should_compile/T27556.hs - + testsuite/tests/simplCore/should_compile/T27556.script - + testsuite/tests/simplCore/should_compile/T27629.hs - + testsuite/tests/simplCore/should_compile/T27629.stderr - + testsuite/tests/simplCore/should_compile/T27629Plugin.hs - + testsuite/tests/simplCore/should_compile/T27749.hs - + testsuite/tests/simplCore/should_compile/T27749.stderr - testsuite/tests/simplCore/should_compile/all.T - testsuite/tests/th/T17380.stderr - testsuite/tests/th/T18612.stderr - + testsuite/tests/th/T27034.hs - + testsuite/tests/th/T27034.stderr - testsuite/tests/th/T8761.stderr - testsuite/tests/th/all.T - + testsuite/tests/type-data/should_fail/T27732a.hs - + testsuite/tests/type-data/should_fail/T27732a.stderr - + testsuite/tests/type-data/should_fail/T27732b.hs - + testsuite/tests/type-data/should_fail/T27732b.stderr - + testsuite/tests/type-data/should_fail/T27732c.hs - + testsuite/tests/type-data/should_fail/T27732c.stderr - + testsuite/tests/type-data/should_fail/T27732d.hs - + testsuite/tests/type-data/should_fail/T27732d.stderr - + testsuite/tests/type-data/should_fail/T27732e.hs - + testsuite/tests/type-data/should_fail/T27732e.stderr - + testsuite/tests/type-data/should_fail/T27732f.hs - + testsuite/tests/type-data/should_fail/T27732f.stderr - testsuite/tests/type-data/should_fail/TDStrictnessGADT.stderr - testsuite/tests/type-data/should_fail/TDStrictnessH98.stderr - testsuite/tests/type-data/should_fail/all.T - + testsuite/tests/typecheck/should_compile/T27664.hs - testsuite/tests/typecheck/should_compile/all.T - + testsuite/tests/warnings/should_compile/T16836a.hs - + testsuite/tests/warnings/should_compile/T16836a.stderr - + testsuite/tests/warnings/should_compile/T16836b.hs - + testsuite/tests/warnings/should_compile/T16836c.hs - + testsuite/tests/warnings/should_compile/T16836c.stderr - + testsuite/tests/warnings/should_compile/T16836d.hs - + testsuite/tests/warnings/should_compile/T16836d.stderr - testsuite/tests/warnings/should_compile/all.T - + testsuite/tests/warnings/should_fail/WExpectedNoArgError.stderr - testsuite/tests/warnings/should_fail/all.T - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.hs - utils/deriveConstants/Main.hs - utils/ghc-toolchain/src/GHC/Toolchain/Program.hs - utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - utils/hsc2hs - utils/jsffi/dyld.mjs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/a5f53cea90e14a4e66974f307134e5… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/a5f53cea90e14a4e66974f307134e5… 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] Pushed new branch wip/jeltsch/eps-without-mod-iface
by Wolfgang Jeltsch (＠jeltsch) 29 Sep '26

29 Sep '26

Wolfgang Jeltsch pushed new branch wip/jeltsch/eps-without-mod-iface at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/jeltsch/eps-without-mod-iface 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/mingw-bindist] 2 commits: Fix path references in mingw default.target file
by Hannes Siebenhandl (＠fendor) 29 Sep '26

29 Sep '26

Hannes Siebenhandl pushed to branch wip/fendor/mingw-bindist at Glasgow Haskell Compiler / GHC Commits: 720d5c52 by Hannes Siebenhandl at 2026-09-29T14:14:11+02:00 Fix path references in mingw default.target file The escaping `$` is no longer necessary since 7d378476c33 copies the `default.target` instead of generating it via config.mk. - - - - - 5416da68 by Hannes Siebenhandl at 2026-09-29T14:17:52+02:00 Add sanity checking for SUBST_TOOLDIR - - - - - 2 changed files: - distrib/configure.ac.in - m4/subst_tooldir.m4 Changes: ===================================== distrib/configure.ac.in ===================================== @@ -103,7 +103,7 @@ AC_ARG_ENABLE(distro-toolchain, AC_SUBST([EnableDistroToolchain]) if test "$HostOS" = "mingw32" -a "$EnableDistroToolchain" = "NO"; then - FP_SETUP_WINDOWS_TOOLCHAIN([$hardtop/mingw/], [\$\$topdir/../mingw/]) + FP_SETUP_WINDOWS_TOOLCHAIN([$hardtop/mingw/], [\$topdir/../mingw/]) fi ===================================== m4/subst_tooldir.m4 ===================================== @@ -41,5 +41,13 @@ dnl ghc-toolchain. # See Note [How we configure the bundled windows toolchain] AC_DEFUN([SUBST_TOOLDIR], [ - sed -i.bkp $1 's%'"$mingw_prefix"'%'"$mingw_install_prefix"'%g' + if ! grep -qF "$mingw_prefix" $1; then + AC_MSG_ERROR([SUBST_TOOLDIR: $1 does not refer to the bundled mingw toolchain at $mingw_prefix]) + fi + if ! sed -i.bkp 's%'"$mingw_prefix"'%'"$mingw_install_prefix"'%g' $1; then + AC_MSG_ERROR([SUBST_TOOLDIR: failed to substitute $mingw_prefix in $1]) + fi + if grep -qF "$mingw_prefix" $1; then + AC_MSG_ERROR([SUBST_TOOLDIR: $1 still refers to $mingw_prefix after substitution]) + fi ]) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/06c6464956df5306648b95b62c3ca7… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/06c6464956df5306648b95b62c3ca7… 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] Pushed new branch wip/fendor/mingw-bindist
by Hannes Siebenhandl (＠fendor) 29 Sep '26

29 Sep '26

Hannes Siebenhandl pushed new branch wip/fendor/mingw-bindist at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/fendor/mingw-bindist 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] 2 commits: Add regression test for #7803
by Marge Bot (＠marge-bot) 29 Sep '26

29 Sep '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: f998dc1f by Vladislav Zavialov at 2026-09-29T07:14:21-04:00 Add regression test for #7803 Commit 2effe18ab5, first shipped with GHC 8.2.1, fixed #7803 "Superclass methods are left unspecialized". This change turns the example from the ticket description into a regression test, checking that foo1 is fully specialised at Double, with no calls to the overloaded exp5Tail. Closes #7803 Assisted-by: Claude Opus 5 - - - - - 5b27f65f by Alan Zimmerman at 2026-09-29T07:14:22-04:00 EPA: Use EpaLocation in EpVirtualBraces Haddock processing uses EpLayout.EpVirtualBraces to record the current layout column, for allocating haddock comments correctly. For exact printing, we need the line as well as the col, so we know how many lines to skip when the indented code block starts. This commit updates EpLayout.EpVirtualBraces so that it carries an EpaLocation instead of just the Int column, to allow it to be used for both purposes. It is a simple mechanical change, with no other impact, but it allows us to use EpLayout instead of AnnListLayout in AnnList, in the next commit in this series. - - - - - 28 changed files: - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - testsuite/tests/ghc-api/exactprint/T22919.stderr - testsuite/tests/ghc-api/exactprint/Test20239.stderr - testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr - testsuite/tests/haddock/should_compile_flag_haddock/T17544.stderr - testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr - testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr - testsuite/tests/module/mod185.stderr - testsuite/tests/parser/should_compile/DumpParsedAst.stderr - testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr - testsuite/tests/parser/should_compile/DumpSemis.stderr - testsuite/tests/parser/should_compile/KindSigs.stderr - testsuite/tests/parser/should_compile/T15323.stderr - testsuite/tests/parser/should_compile/T20452.stderr - testsuite/tests/parser/should_compile/T20718.stderr - testsuite/tests/parser/should_compile/T20718b.stderr - testsuite/tests/parser/should_compile/T20846.stderr - testsuite/tests/parser/should_compile/T23315/T23315.stderr - testsuite/tests/printer/AnnotationNoListTuplePuns.stdout - testsuite/tests/printer/T18791.stderr - testsuite/tests/printer/Test20297.stdout - testsuite/tests/printer/Test24533.stdout - + testsuite/tests/simplCore/should_compile/T7803.hs - + testsuite/tests/simplCore/should_compile/T7803.stderr - + testsuite/tests/simplCore/should_compile/T7803a.hs - testsuite/tests/simplCore/should_compile/all.T Changes: ===================================== compiler/GHC/Parser.y ===================================== @@ -945,13 +945,13 @@ body :: { ([TrailingAnn] ,([LImportDecl GhcPs], [LHsDecl GhcPs]) ,EpLayout) } : '{' top '}' { (fst $2, snd $2, epExplicitBraces $1 $3) } - | vocurly top close { (fst $2, snd $2, EpVirtualBraces (getVOCURLY $1)) } + | vocurly top close { (fst $2, snd $2, EpVirtualBraces (glR $1)) } body2 :: { ([TrailingAnn] ,([LImportDecl GhcPs], [LHsDecl GhcPs]) ,EpLayout) } : '{' top '}' { (fst $2, snd $2, epExplicitBraces $1 $3) } - | missing_module_keyword top close { ([], snd $2, EpVirtualBraces leftmostColumn) } + | missing_module_keyword top close { ([], snd $2, EpVirtualBraces (EpaDelta noSrcSpan (SameLine 0) [])) } top :: { ([TrailingAnn] @@ -1855,7 +1855,7 @@ decllist_cls : '{' decls_cls '}' { sLL $1 $> ((epTok $1, fst $ unLoc $2, epTok $3) ,snd $ unLoc $2, epExplicitBraces $1 $3) } | vocurly decls_cls close { let { L l (anns, decls) = $2 } - in L l ((noEpTok, anns, noEpTok), decls, EpVirtualBraces (getVOCURLY $1)) } + in L l ((noEpTok, anns, noEpTok), decls, EpVirtualBraces (glR $1)) } -- Class body -- @@ -4305,7 +4305,6 @@ getINLINE (L _ (ITinline_prag _ inl conl)) = (inl,conl) getSPEC_INLINE (L _ (ITspec_inline_prag src True)) = (Inline,FunLike) getSPEC_INLINE (L _ (ITspec_inline_prag src False)) = (NoInline,FunLike) getCOMPLETE_PRAGs (L _ (ITcomplete_prag x)) = x -getVOCURLY (L (RealSrcSpan l _) ITvocurly) = srcSpanStartCol l getINTEGERs (L _ (ITinteger (IL src _ _))) = src getCHARs (L _ (ITchar src _)) = src ===================================== compiler/GHC/Parser/Annotation.hs ===================================== @@ -5,7 +5,7 @@ module GHC.Parser.Annotation ( getEpTokenBufSpan, getEpTokenLoc, getEpUniTokenLoc, TokDcolon, TokDarrow, TokRarrow, TokForall, TokStar, - EpLayout(..), + EpLayout(..), getEpaLocationCol, EpaComment(..), EpaCommentTok(..), IsUnicodeSyntax(..), HasE(..), @@ -282,7 +282,9 @@ data EpLayout = -- bar :: a -- @ EpVirtualBraces - !Int -- ^ Layout column (indentation level, begins at 1) + !EpaLocation -- ^ Layout column (indentation level, begins at 1) + -- We keep this as an 'EpaLocation' so exact printing + -- can use it too. | -- | Empty or compiler-generated blocks do not have layout information -- associated with them. @@ -290,6 +292,14 @@ data EpLayout = deriving instance Data EpLayout +-- | Used in 'GHC.Parser.Haddock' to get layout column. It assumes +-- | there is a RealSrcSpan in it, falling back to zero otherwise +getEpaLocationCol :: EpaLocation -> Int +getEpaLocationCol loc + = case loc of + EpaSpan (RealSrcSpan l _) -> srcSpanStartCol l + _ -> leftmostColumn -- should never happen in Parser output + -- --------------------------------------------------------------------- data EpaComment = ===================================== compiler/GHC/Parser/PostProcess/Haddock.hs ===================================== @@ -392,8 +392,9 @@ addHaddockInterleaveItems layout get_doc_item = go with_layout = case layout of EpNoLayout -> id EpExplicitBraces{} -> id - EpVirtualBraces n -> - let loc_range = mempty { loc_range_col = ColumnFrom (n+1) } + EpVirtualBraces n' -> + let n = getEpaLocationCol n' + loc_range = mempty { loc_range_col = ColumnFrom (n+1) } in hoistHdkA (inLocRange loc_range) instance HasHaddock (LocatedA (HsDecl GhcPs)) where @@ -1304,7 +1305,7 @@ mkDocDecl layout (L l_comment hdk_comment) indent_mismatch = case layout of EpNoLayout -> False EpExplicitBraces{} -> False - EpVirtualBraces n -> n /= srcSpanStartCol (psRealSpan l_comment) + EpVirtualBraces n -> getEpaLocationCol n /= srcSpanStartCol (psRealSpan l_comment) mkDocIE :: PsLocated HdkComment -> Maybe (LIE GhcPs) mkDocIE (L l_comment hdk_comment) = ===================================== testsuite/tests/ghc-api/exactprint/T22919.stderr ===================================== @@ -34,7 +34,7 @@ { T22919.hs:1:8-13 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { T22919.hs:2:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/ghc-api/exactprint/Test20239.stderr ===================================== @@ -34,7 +34,7 @@ "-- ^ Run any arbitrary IO code") { Test20239.hs:7:86 }))])) (EpVirtualBraces - (1)) + (EpaSpan { Test20239.hs:5:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr ===================================== @@ -40,7 +40,7 @@ "-- Trailing comment, should be in HsModule extension point") { ZeroWidthSemi.hs:6:5 }))])) (EpVirtualBraces - (1)) + (EpaSpan { ZeroWidthSemi.hs:6:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/haddock/should_compile_flag_haddock/T17544.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { T17544.hs:5:1 })) (Nothing) (Nothing)) (Just @@ -64,7 +64,7 @@ (EpTok (EpaSpan { <no location info> })) []) (EpVirtualBraces - (3))) + (EpaSpan { T17544.hs:6:3 }))) [] (Nothing) (L @@ -243,7 +243,7 @@ (EpTok (EpaSpan { <no location info> })) []) (EpVirtualBraces - (3))) + (EpaSpan { T17544.hs:10:3 }))) [] (Nothing) (L @@ -423,7 +423,7 @@ (EpTok (EpaSpan { <no location info> })) []) (EpVirtualBraces - (3))) + (EpaSpan { T17544.hs:14:3 }))) [] (Nothing) (L @@ -603,7 +603,7 @@ (EpTok (EpaSpan { <no location info> })) []) (EpVirtualBraces - (3))) + (EpaSpan { T17544.hs:18:3 }))) [] (Nothing) (L ===================================== testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { T17544_kw.hs:13:1 })) (Nothing) (Nothing)) (Just @@ -412,7 +412,7 @@ (EpTok (EpaSpan { <no location info> })) []) (EpVirtualBraces - (5))) + (EpaSpan { T17544_kw.hs:22:5 }))) [] (Nothing) (L ===================================== testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { T24221.hs:3:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/module/mod185.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaDelta { <no location info> } (SameLine 0) [])) (Nothing) (Nothing)) (Nothing) ===================================== testsuite/tests/parser/should_compile/DumpParsedAst.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { DumpParsedAst.hs:5:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr ===================================== @@ -41,7 +41,7 @@ { DumpParsedAstComments.hs:1:1-28 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { DumpParsedAstComments.hs:9:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/DumpSemis.stderr ===================================== @@ -45,7 +45,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { DumpSemis.hs:4:1 })) (Nothing) (Nothing)) (Just @@ -1336,7 +1336,7 @@ (EpTok (EpaSpan { <no location info> })) []) (EpVirtualBraces - (3))) + (EpaSpan { DumpSemis.hs:29:3 }))) [] (Nothing) (L ===================================== testsuite/tests/parser/should_compile/KindSigs.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { KindSigs.hs:8:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/T15323.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { T15323.hs:5:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/T20452.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { T20452.hs:5:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/T20718.stderr ===================================== @@ -68,7 +68,7 @@ "-- end 2") { T20718.hs:10:1-8 }))])) (EpVirtualBraces - (1)) + (EpaSpan { T20718.hs:8:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/T20718b.stderr ===================================== @@ -55,7 +55,7 @@ { T20718b.hs:6:1-21 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { T20718b.hs:8:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/T20846.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { T20846.hs:3:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/parser/should_compile/T23315/T23315.stderr ===================================== @@ -24,7 +24,7 @@ (EpaComments [])) (EpVirtualBraces - (1)) + (EpaSpan { T23315.hsig:3:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/printer/AnnotationNoListTuplePuns.stdout ===================================== @@ -47,7 +47,7 @@ "-- comment post B") { AnnotationNoListTuplePuns.hs:17:3 }))])) (EpVirtualBraces - (1)) + (EpaSpan { AnnotationNoListTuplePuns.hs:5:1 })) (Nothing) (Nothing)) (Just @@ -244,7 +244,7 @@ { AnnotationNoListTuplePuns.ppr.hs:1:1-32 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { AnnotationNoListTuplePuns.ppr.hs:4:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/printer/T18791.stderr ===================================== @@ -28,7 +28,7 @@ [] [])) (EpVirtualBraces - (1)) + (EpaSpan { T18791.hs:4:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/printer/Test20297.stdout ===================================== @@ -34,7 +34,7 @@ { Test20297.hs:1:1 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { Test20297.hs:5:1 })) (Nothing) (Nothing)) (Just @@ -476,7 +476,7 @@ { Test20297.ppr.hs:1:1 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { Test20297.ppr.hs:3:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/printer/Test24533.stdout ===================================== @@ -34,7 +34,7 @@ { Test24533.hs:1:1 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { Test24533.hs:4:1 })) (Nothing) (Nothing)) (Just @@ -694,7 +694,7 @@ { Test24533.ppr.hs:1:1 }))] [])) (EpVirtualBraces - (1)) + (EpaSpan { Test24533.ppr.hs:3:1 })) (Nothing) (Nothing)) (Just ===================================== testsuite/tests/simplCore/should_compile/T7803.hs ===================================== @@ -0,0 +1,23 @@ +{-# OPTIONS_GHC -ddump-simpl #-} + +-- #7803: foo1 should be fully specialised at Double. In the bug report +-- it ended up calling the overloaded exp5Tail (with a dictionary argument), +-- because the specialiser ran before the overloaded call was floated to +-- the top level. So the dumped Core for this module must mention no +-- exp5Tail at all. +module T7803 (foo1) where + +import T7803a + +bar :: Floating a => a -> a -> a +bar z = subtract (evaluate integ z) . evaluate integ + where + integ = indefinite (Piecewise [Poly4 1]) +{-# SPECIALIZE bar :: Double -> Double -> Double #-} + +foo :: Floating a => a -> a -> a +foo x = bar x +{-# SPECIALIZE foo :: Double -> Double -> Double #-} + +foo1 :: Double -> Double -> Double +foo1 x = foo x ===================================== testsuite/tests/simplCore/should_compile/T7803.stderr ===================================== @@ -0,0 +1 @@ +foo1 ===================================== testsuite/tests/simplCore/should_compile/T7803a.hs ===================================== @@ -0,0 +1,73 @@ +{-# LANGUAGE ConstraintKinds #-} +{-# LANGUAGE FlexibleContexts #-} +{-# LANGUAGE FlexibleInstances #-} +{-# LANGUAGE MultiParamTypeClasses #-} +{-# LANGUAGE TypeFamilies #-} +{-# LANGUAGE UndecidableInstances #-} +{-# LANGUAGE UndecidableSuperClasses #-} + +module T7803a + ( Evaluate (..) + , HasIntegral (..) + , Poly4 (..) + , Domain + , IntOfLogPoly4 (..) + , Piecewise (..) + ) where + +import Data.Kind (Constraint, Type) + +class Evaluate poly where + evaluate :: (Domain' poly a) => poly a -> a -> a + +class Evaluate (IntegralOf poly) => HasIntegral poly where + type IntegralOf poly :: Type -> Type + indefinite :: (Domain' poly a, Domain' (IntegralOf poly) a) + => poly a -> IntegralOf poly a + +type family Domain (f :: Type -> Type) a :: Constraint + +class Domain f a => Domain' f a +instance Domain f a => Domain' f a + +newtype Poly4 a = Poly4 { poly4_a :: a } + +type instance Domain Poly4 a = Fractional a + +data IntOfLogPoly4 a = IntOfLogPoly4 { ilp4_k :: !a, ilp4_u :: !a } + +type instance Domain IntOfLogPoly4 a = Floating a + +instance Evaluate IntOfLogPoly4 where + evaluate (IntOfLogPoly4 k _) x = k + x * exp5Tail (- log x) + {-# INLINE evaluate #-} + +{-# RULES "exp5Tail/Double" exp5Tail = exp5TailDouble #-} +{-# NOINLINE exp5Tail #-} + +exp5Tail :: (Floating a) => a -> a +exp5Tail x = x / 120 + +exp5TailDouble :: Double -> Double +exp5TailDouble x = x / 120 + +instance HasIntegral Poly4 where + type IntegralOf Poly4 = IntOfLogPoly4 + indefinite = \ (Poly4 a) -> IntOfLogPoly4 0 a + {-# INLINE indefinite #-} + +newtype Piecewise poly a = Piecewise { unPiecewise :: [poly a] } + +type instance Domain (Piecewise poly) a = (Domain poly a, Num a) + +instance (Evaluate poly) => Evaluate (Piecewise poly) where + evaluate = \ (Piecewise pp) x -> + case pp of + p : _ -> evaluate p x + [] -> error "evaluate: empty Piecewise" + {-# INLINE evaluate #-} + +instance (HasIntegral poly) => HasIntegral (Piecewise poly) where + type IntegralOf (Piecewise poly) = Piecewise (IntegralOf poly) + indefinite (Piecewise m) = Piecewise $ map indefinite m + {-# INLINE indefinite #-} ===================================== testsuite/tests/simplCore/should_compile/all.T ===================================== @@ -148,6 +148,13 @@ test('T7785', [ only_ways(['optasm']), grep_errmsg(r'SPEC') ], compile, ['-ddump-cse']) +# T7803: we expect NO calls to the overloaded 'exp5Tail' in T7803.hs +# In the bug report #7803, the unspecialised call was signalled by 'exp5Tail' +# in foo1's Core, so we grep for that; also for 'foo1', lest we dump nothing +# One module, T7803.hs, has OPTIONS_GHC -ddump-simpl +test('T7803', [ grep_errmsg(r'exp5Tail|foo1') ], + multimod_compile, ['T7803', '-O2 -v0 -dsuppress-all -dsuppress-uniques -dno-typeable-binds']) + test('T7702', [extra_files(['T7702plugin']), pre_cmd('$MAKE -s --no-print-directory -C T7702plugin package.T7702 TOP={top}'), View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/a90c0c7281c26f357cf896dc92504d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/a90c0c7281c26f357cf896dc92504d… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/dcoutts/foreign-label-source-refactoring] Documentation: foreign imports of Cmm code may now specify source package
by David Eichmann (＠DavidEichmann) 29 Sep '26

29 Sep '26

David Eichmann pushed to branch wip/dcoutts/foreign-label-source-refactoring at Glasgow Haskell Compiler / GHC Commits: f7ccabc1 by David Eichmann at 2026-09-29T12:12:05+01:00 Documentation: foreign imports of Cmm code may now specify source package - - - - - 2 changed files: - + changelog.d/foreign-import-prim-with-package.md - docs/users_guide/exts/ffi.rst Changes: ===================================== changelog.d/foreign-import-prim-with-package.md ===================================== @@ -0,0 +1,19 @@ +section: cmm +synopsis: Foreign imports of Cmm code may now specify source package +issues: #27162 +mrs: !15905 +description: { + With the `GHCForeignImportPrim` extension, Cmm symbols can be imported via the + `prim` calling convention, but there was previously no way to specify the + source package where the Cmm symbol is defined. With this change, the source + package may be specified before the symbol name, separated by a space. For + example, a Cmm symbol `addOne` from package `somePackage` can be imported as + follows: + + foreign import prim "somePackage addOne" addOne :: Int# -> Int# + + Once dynamic linking on windows is implemented, it will require specifying the + source package for Cmm imports unless the source package is the current + package. Failure to do so will result in linker errors. Non windows targets + and static linking on windows are unaffected. +} ===================================== docs/users_guide/exts/ffi.rst ===================================== @@ -294,6 +294,10 @@ Primitive imports :status: InternalUseOnly +This feature is not intended for use outside of the core libraries that +come with GHC. For more details see the +:ghc-wiki:`GHC developer wiki <commentary/prim-ops>`. + With :extension:`GHCForeignImportPrim`, GHC extends the FFI with an additional calling convention ``prim``, e.g.: :: @@ -306,9 +310,15 @@ or ``Any :: UnliftedType`` (which can be arranged by way of ``unsafeCoerce#``) and the result type is allowed to be an unboxed tuple or the types ``Any :: Type`` or ``Any :: UnliftedType``. -This feature is not intended for use outside of the core libraries that -come with GHC. For more details see the -:ghc-wiki:`GHC developer wiki <commentary/prim-ops>`. +The source package may be specified before the symbol name, separated by a +space. For example, to import ``addOne`` from ``somePackage``: :: + + foreign import prim "somePackage addOne" addOne :: Int# -> Int# + +When dynamic linking on windows, source package must be correctly specified. +If the source package is omitted then it is assumed to be the current package. +An incorrect source package will result in linker errors when dynamic linking +on windows. Static linking and non-windows targets are unaffected. .. _ffi-interruptible: View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f7ccabc15aac7d817d6789fe00c13d6… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/f7ccabc15aac7d817d6789fe00c13d6… 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/homeunit-is-just] Deleted 1 commit: Use `panic` instead of dummy value for initial HomeUnit
by Hannes Siebenhandl (＠fendor) 29 Sep '26

29 Sep '26

Hannes Siebenhandl pushed to branch wip/fendor/homeunit-is-just at Glasgow Haskell Compiler / GHC WARNING: The push did not contain any new commits, but force pushed to delete the commits and changes below. Deleted commits: 6251dc45 by fendor at 2026-09-29T11:40:20+02:00 Use `panic` instead of dummy value for initial HomeUnit - - - - - 1 changed file: - compiler/GHC/Driver/Main/Hsc.hs Changes: ===================================== compiler/GHC/Driver/Main/Hsc.hs ===================================== @@ -112,7 +112,7 @@ newHscEnv top_dir dflags = do where home_unit_graph hpt = HUG.unitEnv_singleton (homeUnitId_ dflags) - (HUG.mkHomeUnitEnv emptyUnitState dflags hpt (DefiniteHomeUnit (homeUnitId_ dflags) Nothing)) + (HUG.mkHomeUnitEnv emptyUnitState dflags hpt (panic "newHscEnv.mkHomeUnitEnv: HomeUnit is not initialised, call 'initUnits' before using the HomeUnit field")) newHscEnvWithHUG :: FilePath -> DynFlags -> UnitId -> HomeUnitGraph -> IO HscEnv newHscEnvWithHUG top_dir top_dynflags cur_unit home_unit_graph = do View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6251dc4583d271a16c9332c2945957d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6251dc4583d271a16c9332c2945957d… 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/dcoutts/foreign-label-source-refactoring] 15 commits: Change dsCCall to take a CCallSpec
by David Eichmann (＠DavidEichmann) 29 Sep '26

29 Sep '26

David Eichmann pushed to branch wip/dcoutts/foreign-label-source-refactoring at Glasgow Haskell Compiler / GHC Commits: 078d8ad0 by Duncan Coutts at 2026-09-25T13:34:03+01:00 Change dsCCall to take a CCallSpec and change callers as appropriate. There should be no semantic change. It's just moving the CCallSpec construction into the two callers. It is currently only used by the C & JS functions that generate code for the foreign import wrapper constructs (in the call to createAdjustor). - - - - - 8024d575 by Duncan Coutts at 2026-09-25T13:34:04+01:00 Change calls to createAdjustor to specify that it comes from the rts Previously it said TargetIsInThisUnit, meaning that createAdjustor lives in the local library. This is false since createAdjustor is defined in the RTS. In practice, this false source information did not matter because the source information is not used (yet). However in future it will be, for better Windows DLL support (which does care about such distinctions). It doesn't really matter that we say it's the RTS (though that is actually true), what's important is that it will always be external to the current shared library. - - - - - 083ba611 by Duncan Coutts at 2026-09-25T13:34:04+01:00 Remove unused TargetIsInThisUnit case from CCallStaticTargetUnit The CCallStaticTargetUnit infortmation in the XStaticTarget (TTG exstension point) is actually pretty dubious. Historically it was a (Maybe Unit) and the comments say that it is only used by out-of-line primop calls on Windows. Indeed it is only used on Windows for the dynamic way, when each unit is built as a separate DLL (which we currently do not support). And even in that hypothetical situation, the information that actually gets filled in is completely bogus. It _could_ be used in the windows dll case to correctly distinguish making an out-of-line call to a cmm primop that is defined in the current dll or in an external dll. But the information gets filled in in the renaming phase with the _current_ unit. This is blatently wrong. Many out-of-line primops are defined in the rts, which is obviously not the current unit. It _could_ be a reasonable default, that cmm primops are expected to be in the current dll, but we would have to have support to specify a different location, i.e. the rts. Furthermore, in addition to TargetIsInThisUnit being unused (after the previous patch) it should never be used because it uses an implicit "this" which will be wrong as soon as the information is inlined across units. Instead of an implicit unit, it should use an explicit unit which can be initialised to the defining unit and then be compared later to the current unit. This will work correctly when looking at unfoldings across unit boundaries. - - - - - 3de1a8ae by Duncan Coutts at 2026-09-25T13:34:04+01:00 Rename CCallStaticTargetUnit to CLabelTargetLibrary And the constructor TargetIsInThat to CLabelTargetInUnit. We will end up using this type both for calls and for labels/addresses (used in core literals), so adjust the name to be about C names/labels rather than about calls specifically. Also improve related code docs. And introduce a conversion function from CLabelTargetLibrary to ForeignLabelSource. We will extend this conversion when we add more constructors to CLabelTargetLibrary. - - - - - a00f28d1 by Duncan Coutts at 2026-09-25T13:34:04+01:00 Change data PrimOp to use a UnitId rather than Unit This simplifies the conversions slightly, but more importantly in a later change we are going to want to specify a unit where we will only have a UnitId to hand, not a Unit. - - - - - 07bf7fa3 by Duncan Coutts at 2026-09-29T11:38:16+01:00 Extend 'foreign import prim' syntax to allow specifying the source package that is: the package where the cmm entity comes from. The package name is stashed in the "header" field for the FFI call, and then the renamer resolves the package name to a unit id (with a new ghc error for the failure of the package name resolution). Fixes issue #27206 Adds test case T27206 - - - - - 3d5e5e56 by Duncan Coutts at 2026-09-29T11:38:16+01:00 Use new package name syntax for primops from the RTS foreign import prim "rts stg_thething" Most uses of foreign import prim in the libraries are for primops defined in .cmm files local to that library, but some import primops defined in the rts. These cases should use the new syntax to specify the package name in the ffi entity string. - - - - - 26a5ed6d by Duncan Coutts at 2026-09-29T11:38:17+01:00 Extend ForeignLabelSource with ForeignLabelInUnknownPackage case Initially this is treated the same way as ForeignLabelInExternalPackage. Later we will extend this for Windows/PE to support building each Haskell unit as a separate DLL, to support this unknown case specifically. - - - - - f5261593 by Duncan Coutts at 2026-09-29T11:38:17+01:00 Extend CLabelTargetLibrary with CLabelTargetUnknown case Initially unused, but this will become the typical case, because in fact when Haskell code uses ffi imports, we do not know where the name comes from: we do not know if the named entity is defined in the current shared lib or in another one. Knowing where C entities come from is the exception rather than the rule. - - - - - e216bc53 by Duncan Coutts at 2026-09-29T11:38:17+01:00 Extend LitLabel with CLabelTargetLibrary Bundle the three fields of LitLabel into a new data CLabelSpec, defined in GHC.Types.ForeignCall Apart from the binary format, this should not change behaviour. Behaviour changes are in the next patch - - - - - 1c2891e2 by Duncan Coutts at 2026-09-29T11:38:17+01:00 Change FFI imports to use CLabelTargetUnknown We never know the target for normal foreign imports. Historically, this information was only actually used for "foreign import prim", and only on Windows when building with one DLL per unit (which bitrotted). The previous default of using the current package as the source was wrong, even for the limited case of Windows DLLs, because many of the imports are for primops defined in the RTS, which is certainly not the current package. - - - - - 1d64f750 by Duncan Coutts at 2026-09-29T11:38:17+01:00 Pass through the label source in stg->cmm conversion Previously we had to hard code the (often incorrect) source ForeignLabelInThisPackage. Now the Core label literal representation carries the source, so we just convert that and pass it down. As a consequence, if the source will now be either ForeignLabelInUnknownPackage or ForeignLabelInPackage. The typical value will be ForeignLabelInUnknownPackage, since that's what we get for FFI imports of addresses. In practice is not an immediate change of behaviour, because the only user of this information is on Windows when building each Haskell unit as a separate DLl, which isn't (yet) supported. - - - - - 2ba26f14 by Duncan Coutts at 2026-09-29T11:38:17+01:00 Fix source for generated C name for 'foreign import "wrapper"' For a 'foreign import "wrapper"' construct we generate a local wrapper C function. We need to refer to the name of this local C function. We _know_ that this function lives in the local shared lib, because it is compiled into the same library. Thus we set the label source to be CLabelTargetInUnit. - - - - - f117b62c by Duncan Coutts at 2026-09-29T11:38:17+01:00 Fix source for generated C name for 'foreign import capi' For a 'foreign import capi' we generate a local wrapper function and then call that. We need to refer to the name of this local C function. We _know_ that this function lives in the local shared lib, because it is compiled into the same library. Thus we set the label source to be CLabelTargetInUnit. - - - - - c2958f0e by David Eichmann at 2026-09-29T11:38:17+01:00 Documentation: foreign imports of Cmm code may now specify source package - - - - - 31 changed files: - + changelog.d/foreign-import-prim-with-package.md - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/Cmm/CLabel.hs - compiler/GHC/CmmToAsm/PIC.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Foreign/Wasm.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm/Foreign.hs - compiler/GHC/StgToCmm/Lit.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/StgToJS/FFI.hs - compiler/GHC/StgToJS/Literal.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/ForeignCall.hs - compiler/GHC/Types/Literal.hs - docs/users_guide/exts/ffi.rst - libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs - libraries/ghc-internal/src/GHC/Internal/Prim/Ext.hs - libraries/ghc-internal/src/GHC/Internal/Prim/Panic.hs - + testsuite/tests/rename/should_fail/T27206.hs - + testsuite/tests/rename/should_fail/T27206.stderr - testsuite/tests/rename/should_fail/all.T - testsuite/tests/simplCore/should_compile/T16122.stderr The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/55b7385bcaea94ef3ea68f5ce93400… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/55b7385bcaea94ef3ea68f5ce93400… 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] Pushed new branch wip/sjakobi/T27368-cbe-expand-subst
by Simon Jakobi (＠sjakobi) 29 Sep '26

29 Sep '26

Simon Jakobi pushed new branch wip/sjakobi/T27368-cbe-expand-subst at Glasgow Haskell Compiler / GHC -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/tree/wip/sjakobi/T27368-cbe-expand-sub… 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/T27731] 2 commits: Wibble comment
by Simon Peyton Jones (＠simonpj) 29 Sep '26

29 Sep '26

Simon Peyton Jones pushed to branch wip/T27731 at Glasgow Haskell Compiler / GHC Commits: 7020442a by Simon Peyton Jones at 2026-09-29T09:09:41+01:00 Wibble comment - - - - - 2c3c41a4 by Simon Peyton Jones at 2026-09-29T11:00:21+01:00 Improvements - - - - - 18 changed files: - compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Types/Constraint.hs - testsuite/tests/overloadedstrings/should_fail/T25926.stderr - testsuite/tests/overloadedstrings/should_fail/T27124.stderr - testsuite/tests/patsyn/should_fail/records-nofieldselectors.stderr - testsuite/tests/typecheck/should_compile/T11254.stderr - testsuite/tests/typecheck/should_compile/T15370.stderr - testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr - testsuite/tests/typecheck/should_fail/ClassOperator.stderr - testsuite/tests/typecheck/should_fail/DoExpansion2.stderr - testsuite/tests/typecheck/should_fail/DoExpansion3.stderr - testsuite/tests/typecheck/should_fail/T22940.stderr - testsuite/tests/typecheck/should_fail/T26823.stderr - testsuite/tests/typecheck/should_fail/T5691.stderr - testsuite/tests/typecheck/should_fail/T7437.stderr - testsuite/tests/typecheck/should_fail/tcfail019.stderr Changes: ===================================== compiler/GHC/Builtin/WiredIn/Ids.hs ===================================== @@ -600,8 +600,8 @@ Wrinkles (W1) Sometimes case (2) above needs to apply `noinline` to a type of kind Constraint; e.g. noinline @(Eq Int) $dfEqInt - We don't have type-or-kind polymorphism, so we simply have two `inline` - Ids, namely `noinlineId` and `noinlineConstraintId`. + We don't have type-or-constraint polymorphism, so we simply have two + `inline` Ids, namely `noinlineId` and `noinlineConstraintId`. (W2) Note that noinline as currently implemented can hide some simplifications since it hides strictness from the demand analyser. Specifically, the ===================================== compiler/GHC/Tc/Errors.hs ===================================== @@ -711,35 +711,30 @@ reportWanteds ctxt tc_lvl wc@(WC { wc_simple = simples, wc_impl = implics (vis_items, invis_items) = partition (isVisibleOrigin . errorItemOrigin) tidy_items - ; (vis_items1, vis_serious_errs) - <- askErrsFound $ - tryReporters ctxt suppress_insols serious_reporters vis_items - - ; let suppress_invis = suppress_insols || vis_serious_errs - ; (invis_items1, invis_serious_errs) - <- askErrsFound $ - tryReporters ctxt suppress_invis serious_reporters invis_items + ; (vis_items1, suppress_invis) <- tryReporters ctxt serious_reporters + (vis_items, suppress_insols) + ; (invis_items1, suppress_others) <- tryReporters ctxt serious_reporters + (invis_items, suppress_invis) -- Now take account of the inherited cec_error_reported, and augment it -- to suppress further errors if we have found any serious errors locally -- See (SLIE2) in Note Note [cec_error_reported: suppressing less-serious errors] ; let suppress_implics = cec_error_reported ctxt - || suppress_invis - || invis_serious_errs + || suppress_others ctxt_for_implics = ctxt { cec_error_reported = suppress_implics } (insol_implics, other_implics) = partitionBag insolubleImplic implics -- Next, deal with the insoluble implications - ; (_, implic_errs) - <- askErrsFound $ mapBagM_ (reportImplic ctxt_for_implics) insol_implics + ; (_, implic_errs) <- askErrsFound $ + mapBagM_ (reportImplic ctxt_for_implics) insol_implics -- Finally, deal with the less-serious constraints, -- both local and implications -- suppressing if any errors have been reported so far ; let suppress_rest = suppress_implics || implic_errs ctxt_for_rest = ctxt { cec_error_reported = suppress_rest } - ; leftovers <- tryReporters ctxt suppress_rest less_serious_reporters $ - (vis_items1 ++ invis_items1) + ; (leftovers,_) <- tryReporters ctxt less_serious_reporters $ + (vis_items1 ++ invis_items1, suppress_rest) ; mapBagM_ (reportImplic ctxt_for_rest) other_implics -- Check that we have covered all the constraints @@ -749,7 +744,7 @@ reportWanteds ctxt tc_lvl wc@(WC { wc_simple = simples, wc_impl = implics $$ ppr leftovers) } where - env = cec_tidy ctxt + env = cec_tidy ctxt partition_errors :: [DelayedError] -> ([Hole], [Hole], [NotConcreteError], [(TcCoercion, CtLoc)]) partition_errors [] @@ -1439,35 +1434,37 @@ mkErrorTerm ct_loc ty ctxt msg supp hints ; return $ evDelayedError ty err_str } tryReporters :: SolverReportErrCtxt - -> Bool -- Suppress errors if this is True - -- (over-riding cec_error_reported) -> [ReporterSpec] - -> [ErrorItem] - -> TcM [ErrorItem] + -> ([ErrorItem], Bool) -- Bool=True <=> an earlier error has been reported, + -- so suppress further ones + -> TcM ([ErrorItem], Bool) -- Returned Bool augments incoming one -- Use the first reporter in the list whose predicate says True -tryReporters ctxt suppress reporters items +tryReporters ctxt reporters items = do { traceTc "tryReporters {" (ppr items) ; items' <- go reporters items ; traceTc "tryReporters }" (ppr items') ; return items' } where -- Use `suppress` to set the `cec_error_reported` flag for these items - ctxt_w_suppress = ctxt { cec_error_reported = suppress } + go :: [ReporterSpec] -> ([ErrorItem], Bool) -> TcM ([ErrorItem], Bool) go [] items = return items - go (r:rs) items = do { items' <- tryReporter ctxt_w_suppress r items + go (r:rs) items = do { items' <- tryReporter ctxt r items ; go rs items' } -- Carry on with the rest, because we must make -- deferred bindings for them if we have -fdefer-type-errors -tryReporter :: SolverReportErrCtxt -> ReporterSpec -> [ErrorItem] -> TcM [ErrorItem] -tryReporter ctxt (str, keep_me, reporter) items = case nonEmpty yeses of - Nothing -> return items - Just yeses -> do - { traceTc "tryReporter{ " (text str <+> ppr yeses) - ; reporter ctxt yeses - ; traceTc "tryReporter end }" empty - ; return nos } +tryReporter :: SolverReportErrCtxt -> ReporterSpec + -> ([ErrorItem], Bool) -> TcM ([ErrorItem], Bool) +tryReporter ctxt (str, keep_me, reporter) (items, suppress) + = case nonEmpty yeses of + Nothing -> return (items, suppress) + Just yeses -> do + { traceTc "tryReporter{ " (text str <+> ppr yeses) + ; (_, errs_found) <- askErrsFound (reporter ctxt_w_supp yeses) + ; traceTc "tryReporter end }" empty + ; return (nos, suppress || errs_found) } where + ctxt_w_supp = ctxt { cec_error_reported = suppress } (yeses, nos) = partition keep items keep item = keep_me item (classifyPredType (errorItemPred item)) ===================================== compiler/GHC/Tc/Solver/Default.hs ===================================== @@ -993,10 +993,9 @@ last example above. tryTypeClassDefaulting :: WantedConstraints -> TcS WantedConstraints tryTypeClassDefaulting wc - | isEmptyWC wc - -- || insolubleWC wc -- See Note [Defaulting insolubles] + | isSolvedWC wc -- Not isEmptyWC, see (SCS5) in Note [Shortcut solving] = return wc - | otherwise -- See Note [When to do type-class defaulting] + | otherwise -- See Note [When to do type-class defaulting] = do { something_happened <- applyDefaultingRules wc -- See Note [Top-level Defaulting Plan] ; solveAgainIf something_happened wc } @@ -1007,9 +1006,6 @@ applyDefaultingRules :: WantedConstraints -> TcS Bool -- See Note [How type-class constraints are defaulted] applyDefaultingRules wanteds - | isSolvedWC wanteds -- not isEmptyWC, see (SCS5) in Note [Shortcut solving] - = return False - | otherwise = do { (default_env, extended_rules) <- getDefaultInfo ; wanteds <- TcS.zonkWC wanteds @@ -1029,13 +1025,23 @@ applyDefaultingRules wanteds ; return (wanteds, defaultedGroups) } - ; let groups = findDefaultableGroups (default_tys, extended_rules) wanteds + -- Extract from the WantedConstraints + -- a bag of constraints we might default + ; let possibly_defaultable_cts = approximateWC True wanteds + -- True: for the purpose of defaulting we don't care + -- about shape or enclosing equalities + -- See (W3) in Note [ApproximateWC] in GHC.Tc.Types.Constraint + + -- Divide then into groups, by the tyvar they constrain + ; let groups = findDefaultableGroups (default_tys, extended_rules) + possibly_defaultable_cts ; traceTcS "applyDefaultingRules {" $ vcat [ text "wanteds =" <+> ppr wanteds , text "groups =" <+> ppr groups , text "info =" <+> ppr (default_tys, extended_rules) ] + -- Try defaulting each group separately ; something_happeneds <- mapM (disambigGroup wanteds default_tys) groups ; traceTcS "applyDefaultingRules }" (ppr something_happeneds) @@ -1064,10 +1070,10 @@ applyDefaultingRules wanteds findDefaultableGroups :: ( [ClassDefaults] - , Bool ) -- extended default rules - -> WantedConstraints -- Unsolved + , Bool ) -- Extended default rules + -> Bag Ct -- Unsolved, perhpas defaultable -> [(TyVar, [Ct])] -findDefaultableGroups (default_tys, extended_defaults) wanteds +findDefaultableGroups (default_tys, extended_defaults) simples | null default_tys = [] | otherwise @@ -1077,11 +1083,6 @@ findDefaultableGroups (default_tys, extended_defaults) wanteds , defaultable_tyvar tv , defaultable_classes (map sndOf3 group) ] where - simples = approximateWC True wanteds - -- True: for the purpose of defaulting we don't care - -- about shape or enclosing equalities - -- See (W3) in Note [ApproximateWC] in GHC.Tc.Types.Constraint - (unaries, non_unaries) = partitionWith find_unary (bagToList simples) unary_groups = equivClasses cmp_tv unaries ===================================== compiler/GHC/Tc/Types/Constraint.hs ===================================== @@ -1824,6 +1824,10 @@ type ApproxWC = ( Bag Ct -- Free quantifiable constraints -- See (DP1) in Note [decideAndPromoteTyVars] in GHC.Tc.Solver approximateWC :: Bool -> WantedConstraints -> Bag Ct approximateWC include_non_quantifiable cts + | any insolubleWantedCt (wc_simple cts) + = -- See (W5) in Note [ApproximateWC] + emptyCts + | otherwise = fst (approximateWCX include_non_quantifiable cts) approximateWCX :: Bool -> WantedConstraints -> ApproxWC @@ -1861,7 +1865,7 @@ approximateWCX include_non_quantifiable wc -- There can be (insoluble) Given constraints in wc_simple, -- there so that we get error reports for unreachable code -- See `given_insols` in GHC.Tc.Solver.Solve.solveImplication - | insolubleCt ct = acc + | insolubleCt ct = acc -- See (W5) | pred_tvs `intersectsVarSet` skol_tvs = acc | include_non_quantifiable = add_to_quant | is_quantifiable encl_eqs (ctPred ct) = add_to_quant @@ -1973,6 +1977,18 @@ Wrinkle (W4) SPECIALISE pragmas: see (WFA4) in Note [Solving a Wanted forall-constraint]. But there we don't use approximateWC.) +Wrinkle (W5) + If an implication is insoluble we give up and return no constraints. We + do this locally, per-implication, so that sister soluble implications are + defulted normally. + + * For inferring types in `simplifyInfer` dhere is no point in inferring a + type with carefully chosen constraints if there is a type error anyway + + * For defaulting see Note [When to do type-class defaulting]. A tiresome + complication is that in the top-level WantedConstraints we have no + `ic_status` flag to look at, so we consult the `wc_simple` directly. + ------ Historical note ----------- There used to be a second caveat, driven by #8155 ===================================== testsuite/tests/overloadedstrings/should_fail/T25926.stderr ===================================== @@ -1,3 +1,11 @@ +T25926.hs:3:6: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • No instance for ‘Eq a’ arising from the literal ‘0’ + Possible fix: + add (Eq a) to the context of + the inferred type of f :: () -> a -> () + • In the pattern: 0 + In an equation for ‘f’: f () 0 = () + T25926.hs:4:3: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match expected type ‘()’ with actual type ‘Char’ • In the pattern: 'a' ===================================== testsuite/tests/overloadedstrings/should_fail/T27124.stderr ===================================== @@ -4,3 +4,17 @@ T27124.hs:6:5: warning: [GHC-18872] [-Wdeferred-type-errors (in -Wdefault)] • In the pattern: "HI" In an equation for ‘foo’: foo "HI" = True +T27124.hs:9:8: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘f0’ arising from a use of ‘pure’ + prevents the constraint ‘(Applicative f0)’ from being solved. + Relevant bindings include main :: f0 () (bound at T27124.hs:9:1) + Probable fix: use a type annotation to specify what ‘f0’ should be. + Potentially matching instances: + instance Applicative IO -- Defined in ‘GHC.Internal.Base’ + instance Applicative Maybe -- Defined in ‘GHC.Internal.Base’ + ...plus six others + ...plus one instance involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the expression: pure () + In an equation for ‘main’: main = pure () + ===================================== testsuite/tests/patsyn/should_fail/records-nofieldselectors.stderr ===================================== @@ -1,6 +1,6 @@ - records-nofieldselectors.hs:9:12: error: [GHC-88464] - Variable not in scope: x :: [a0] -> Int + Variable not in scope: x :: [Integer] -> Int Suggested fix: Notice that ‘x’ is a field selector that has been suppressed by NoFieldSelectors. + ===================================== testsuite/tests/typecheck/should_compile/T11254.stderr ===================================== @@ -1,9 +1,18 @@ - T11254.hs:16:10: warning: [GHC-18872] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match type ‘Frac Int’ with ‘Int’ arising from the superclasses of an instance declaration • In the instance declaration for ‘ID Rational’ +T11254.hs:16:10: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • No instance for ‘Fractional Int’ + arising from the superclasses of an instance declaration + • In the instance declaration for ‘ID Rational’ + +T11254.hs:16:10: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • No instance for ‘ID Int’ + arising from the superclasses of an instance declaration + • In the instance declaration for ‘ID Rational’ + T11254.hs:18:12: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match type ‘GHC.Internal.Real.Ratio Integer’ with ‘Int’ Expected: Rational -> Frac Rational @@ -13,3 +22,4 @@ T11254.hs:18:12: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] Instance sig: Rational -> Rational Class sig: Rational -> Frac Rational In the instance declaration for ‘ID Rational’ + ===================================== testsuite/tests/typecheck/should_compile/T15370.stderr ===================================== @@ -1,4 +1,3 @@ - T15370.hs:14:10: warning: [GHC-25897] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match type ‘n’ with ‘j’ Expected: n :~: j @@ -27,6 +26,17 @@ T15370.hs:20:13: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] no :: S r (bound at T15370.hs:18:7) right :: S r -> () (bound at T15370.hs:18:1) +T15370.hs:20:16: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Could not deduce ‘Num ()’ arising from a use of ‘+’ + from the context: y ~ x + bound by a pattern with constructor: + Refl :: forall {k} (a :: k). a :~: a, + in a case alternative + at T15370.hs:20:5-8 + • In the expression: no + _ + In a case alternative: Refl -> no + _ + In the expression: case mkRefl @x @y of Refl -> no + _ + T15370.hs:20:18: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] • Found hole: _ :: () • In the second argument of ‘(+)’, namely ‘_’ @@ -41,3 +51,4 @@ T15370.hs:20:18: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] mempty :: forall a. Monoid a => a maxBound :: forall a. Bounded a => a minBound :: forall a. Bounded a => a + ===================================== testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr ===================================== @@ -67,8 +67,7 @@ valid_hole_fits.hs:24:9: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] (and originally defined at ValidHoleFits.hs:4:12-22)) valid_hole_fits.hs:27:5: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] - • Found hole: _ :: t0 -> Maybe Integer - Where: ‘t0’ is an ambiguous type variable + • Found hole: _ :: Integer -> Maybe Integer • In the expression: _ 2 In an equation for ‘k’: k = _ 2 • Relevant bindings include @@ -87,6 +86,20 @@ valid_hole_fits.hs:27:5: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] (imported from ‘Prelude’ at valid_hole_fits.hs:3:1-40 (and originally defined in ‘GHC.Internal.Base’)) +valid_hole_fits.hs:30:5: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘a1’ arising from a use of ‘show’ + prevents the constraint ‘(Show a1)’ from being solved. + Probable fix: use a type annotation to specify what ‘a1’ should be. + Potentially matching instances: + instance (Show a, Show b) => Show (Either a b) + -- Defined in ‘GHC.Internal.Data.Either’ + instance Show Integer -- Defined in ‘GHC.Internal.Show’ + ...plus 26 others + ...plus 40 instances involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the expression: show _ + In an equation for ‘f’: f = show _ + valid_hole_fits.hs:30:10: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] • Found hole: _ :: a1 Where: ‘a1’ is an ambiguous type variable @@ -123,6 +136,20 @@ valid_hole_fits.hs:30:10: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] (imported from ‘Prelude’ at valid_hole_fits.hs:3:1-40 (and originally defined in ‘GHC.Internal.Float’)) +valid_hole_fits.hs:34:5: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘a0’ arising from a use of ‘show’ + prevents the constraint ‘(Show a0)’ from being solved. + Probable fix: use a type annotation to specify what ‘a0’ should be. + Potentially matching instances: + instance (Show a, Show b) => Show (Either a b) + -- Defined in ‘GHC.Internal.Data.Either’ + instance Show Integer -- Defined in ‘GHC.Internal.Show’ + ...plus 26 others + ...plus 35 instances involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the expression: show (_ (_ :: Bool)) + In an equation for ‘h’: h = show (_ (_ :: Bool)) + valid_hole_fits.hs:34:11: warning: [GHC-88464] [-Wtyped-holes (in -Wdefault)] • Found hole: _ :: Bool -> a0 Where: ‘a0’ is an ambiguous type variable ===================================== testsuite/tests/typecheck/should_fail/ClassOperator.stderr ===================================== @@ -2,51 +2,51 @@ ClassOperator.hs:14:3: error: [GHC-39999] • Could not deduce ‘a ><> b0’ from the context: a ><> b bound by the type signature for: - (<**) :: forall a b. (a ><> b) => a -> a -> () + (**>) :: forall a b. (a ><> b) => a -> a -> () at ClassOperator.hs:14:3-44 The type variable ‘b0’ is ambiguous - • In the ambiguity check for ‘<**’ + • In the ambiguity check for ‘**>’ To defer the ambiguity check to use sites, enable AllowAmbiguousTypes When checking the class method: - (<**) :: forall a b. (a ><> b) => a -> a -> () + (**>) :: forall a b. (a ><> b) => a -> a -> () In the class declaration for ‘><>’ ClassOperator.hs:14:3: error: [GHC-39999] • Could not deduce ‘a ><> b0’ from the context: a ><> b bound by the type signature for: - (>**) :: forall a b. (a ><> b) => a -> a -> () + (**<) :: forall a b. (a ><> b) => a -> a -> () at ClassOperator.hs:14:3-44 The type variable ‘b0’ is ambiguous - • In the ambiguity check for ‘>**’ + • In the ambiguity check for ‘**<’ To defer the ambiguity check to use sites, enable AllowAmbiguousTypes When checking the class method: - (>**) :: forall a b. (a ><> b) => a -> a -> () + (**<) :: forall a b. (a ><> b) => a -> a -> () In the class declaration for ‘><>’ ClassOperator.hs:14:3: error: [GHC-39999] • Could not deduce ‘a ><> b0’ from the context: a ><> b bound by the type signature for: - (**<) :: forall a b. (a ><> b) => a -> a -> () + (>**) :: forall a b. (a ><> b) => a -> a -> () at ClassOperator.hs:14:3-44 The type variable ‘b0’ is ambiguous - • In the ambiguity check for ‘**<’ + • In the ambiguity check for ‘>**’ To defer the ambiguity check to use sites, enable AllowAmbiguousTypes When checking the class method: - (**<) :: forall a b. (a ><> b) => a -> a -> () + (>**) :: forall a b. (a ><> b) => a -> a -> () In the class declaration for ‘><>’ ClassOperator.hs:14:3: error: [GHC-39999] • Could not deduce ‘a ><> b0’ from the context: a ><> b bound by the type signature for: - (**>) :: forall a b. (a ><> b) => a -> a -> () + (<**) :: forall a b. (a ><> b) => a -> a -> () at ClassOperator.hs:14:3-44 The type variable ‘b0’ is ambiguous - • In the ambiguity check for ‘**>’ + • In the ambiguity check for ‘<**’ To defer the ambiguity check to use sites, enable AllowAmbiguousTypes When checking the class method: - (**>) :: forall a b. (a ><> b) => a -> a -> () + (<**) :: forall a b. (a ><> b) => a -> a -> () In the class declaration for ‘><>’ ===================================== testsuite/tests/typecheck/should_fail/DoExpansion2.stderr ===================================== @@ -59,6 +59,20 @@ DoExpansion2.hs:34:22: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefaul In the expression: getVal 3 4 In a stmt of a 'do' block: Just x <- getVal 3 4 +DoExpansion2.hs:34:31: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘t0’ arising from the literal ‘4’ + prevents the constraint ‘(Num t0)’ from being solved. + Probable fix: use a type annotation to specify what ‘t0’ should be. + Potentially matching instances: + instance Num Integer -- Defined in ‘GHC.Internal.Num’ + instance Num Double -- Defined in ‘GHC.Internal.Float’ + ...plus three others + ...plus one instance involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the second argument of ‘getVal’, namely ‘4’ + In the expression: getVal 3 4 + In a stmt of a 'do' block: Just x <- getVal 3 4 + DoExpansion2.hs:39:19: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match type ‘[Char]’ with ‘Int’ Expected: Int ===================================== testsuite/tests/typecheck/should_fail/DoExpansion3.stderr ===================================== @@ -1,3 +1,24 @@ +DoExpansion3.hs:12:20: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • No instance for ‘Num String’ arising from the literal ‘1’ + • In the expression: 1 + In an equation for ‘x’: x = 1 + In a stmt of a 'do' block: let x = 1 + +DoExpansion3.hs:13:20: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘a1’ arising from the literal ‘2’ + prevents the constraint ‘(Num a1)’ from being solved. + Relevant bindings include y :: a1 (bound at DoExpansion3.hs:13:16) + Probable fix: use a type annotation to specify what ‘a1’ should be. + Potentially matching instances: + instance Num Integer -- Defined in ‘GHC.Internal.Num’ + instance Num Double -- Defined in ‘GHC.Internal.Float’ + ...plus three others + ...plus one instance involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the expression: 2 + In an equation for ‘y’: y = 2 + In a stmt of a 'do' block: let y = 2 + DoExpansion3.hs:15:20: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match type ‘[Char]’ with ‘Int’ Expected: Int @@ -15,6 +36,38 @@ DoExpansion3.hs:18:20: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefaul In an equation for ‘y’: y = getChar 2 • Relevant bindings include y :: t (bound at DoExpansion3.hs:18:16) +DoExpansion3.hs:18:28: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘t0’ arising from the literal ‘2’ + prevents the constraint ‘(Num t0)’ from being solved. + Probable fix: use a type annotation to specify what ‘t0’ should be. + Potentially matching instances: + instance Num Integer -- Defined in ‘GHC.Internal.Num’ + instance Num Double -- Defined in ‘GHC.Internal.Float’ + ...plus three others + ...plus one instance involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the first argument of ‘getChar’, namely ‘2’ + In the expression: getChar 2 + In an equation for ‘y’: y = getChar 2 + +DoExpansion3.hs:19:20: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • Ambiguous type variable ‘a0’ arising from the literal ‘3’ + prevents the constraint ‘(Num a0)’ from being solved. + Relevant bindings include z :: a0 (bound at DoExpansion3.hs:19:16) + Probable fix: use a type annotation to specify what ‘a0’ should be. + Potentially matching instances: + instance Num Integer -- Defined in ‘GHC.Internal.Num’ + instance Num Double -- Defined in ‘GHC.Internal.Float’ + ...plus three others + ...plus one instance involving out-of-scope types + (use -fprint-potential-instances to see them all) + • In the expression: 3 + In an equation for ‘z’: z = 3 + In a stmt of a 'do' block: + let x = 1 + y = getChar 2 + z = 3 + DoExpansion3.hs:25:20: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match expected type ‘Int’ with actual type ‘Char’ • In the first argument of ‘(+)’, namely ‘x’ @@ -29,6 +82,12 @@ DoExpansion3.hs:27:12: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefaul do Just x <- getChar return x +DoExpansion3.hs:32:11: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • No instance for ‘Num String’ arising from the literal ‘1’ + • In the expression: 1 + In an equation for ‘a’: a = 1 + In a stmt of a 'do' block: let a = 1 + DoExpansion3.hs:33:3: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault)] • Couldn't match type ‘()’ with ‘Int’ Expected: IO Int @@ -44,3 +103,12 @@ DoExpansion3.hs:33:3: warning: [GHC-83865] [-Wdeferred-type-errors (in -Wdefault let a = 1 putStrLn $ a + "" +DoExpansion3.hs:33:16: warning: [GHC-39999] [-Wdeferred-type-errors (in -Wdefault)] + • No instance for ‘Num String’ arising from a use of ‘+’ + • In the second argument of ‘($)’, namely ‘a + ""’ + In a stmt of a 'do' block: putStrLn $ a + "" + In the expression: + do let z :: Int = 3 + let a = 1 + putStrLn $ a + "" + ===================================== testsuite/tests/typecheck/should_fail/T22940.stderr ===================================== @@ -1,3 +1,3 @@ - T22940.hs:4:48: error: [GHC-88464] - Variable not in scope: a + Variable not in scope: a :: Integer + ===================================== testsuite/tests/typecheck/should_fail/T26823.stderr ===================================== @@ -1,7 +1,8 @@ T26823.hs:12:14: error: [GHC-25897] - • Couldn't match expected type ‘a0 -> a0 -> t’ with actual type ‘t’ + • Couldn't match expected type ‘Integer -> Integer -> t’ + with actual type ‘t’ ‘t’ is a rigid type variable bound by - the inferred type of rem :: a0 -> a0 -> t + the inferred type of rem :: Integer -> Integer -> t at T26823.hs:12:5-29 • In the expression: off `rem` vecAli In an equation for ‘rem’: !rem = off `rem` vecAli @@ -12,21 +13,13 @@ T26823.hs:12:14: error: [GHC-25897] !rem = off `rem` vecAli !start = if rem == 0 then off else off + (vecAli - rem) • Relevant bindings include - rem :: a0 -> a0 -> t (bound at T26823.hs:12:6) - off :: a0 (bound at T26823.hs:8:6) - vecAli :: a0 (bound at T26823.hs:10:6) - size :: a0 (bound at T26823.hs:9:6) + rem :: Integer -> Integer -> t (bound at T26823.hs:12:6) -T26823.hs:13:57: error: [GHC-27958] - • Couldn't match expected type ‘a0’ - with actual type ‘a0 -> a0 -> t0’ - • In the second argument of ‘(-)’, namely ‘rem’ +T26823.hs:13:57: error: [GHC-83865] + • Couldn't match expected type ‘Integer’ + with actual type ‘Integer -> Integer -> t0’ + • Probable cause: ‘rem’ is applied to too few arguments + In the second argument of ‘(-)’, namely ‘rem’ In the second argument of ‘(+)’, namely ‘(vecAli - rem)’ In the expression: off + (vecAli - rem) - • Relevant bindings include - start :: a0 (bound at T26823.hs:13:6) - rem :: forall {t}. a0 -> a0 -> t (bound at T26823.hs:12:6) - off :: a0 (bound at T26823.hs:8:6) - vecAli :: a0 (bound at T26823.hs:10:6) - size :: a0 (bound at T26823.hs:9:6) ===================================== testsuite/tests/typecheck/should_fail/T5691.stderr ===================================== @@ -1,10 +1,10 @@ - T5691.hs:24:10: error: [GHC-39999] - • No instance for ‘Alternative RecDecParser’ + • No instance for ‘Monad RecDecParser’ arising from the superclasses of an instance declaration • In the instance declaration for ‘MonadPlus RecDecParser’ T5691.hs:24:10: error: [GHC-39999] - • No instance for ‘Monad RecDecParser’ + • No instance for ‘Alternative RecDecParser’ arising from the superclasses of an instance declaration • In the instance declaration for ‘MonadPlus RecDecParser’ + ===================================== testsuite/tests/typecheck/should_fail/T7437.stderr ===================================== @@ -1,12 +1,3 @@ - -T7437.hs:14:13: error: [GHC-72771] - • The default type signature for put: - forall t. (Generic t, GPut (Rep t)) => t -> [()] - does not match its corresponding non-default type signature - • When checking the class method: - put :: forall a. Put a => a -> [()] - In the class declaration for ‘Put’ - T7437.hs:14:13: error: [GHC-39999] • Could not deduce ‘Put a0’ from the context: (Put a, Generic t, GPut (Rep t)) @@ -18,3 +9,12 @@ T7437.hs:14:13: error: [GHC-39999] To defer the ambiguity check to use sites, enable AllowAmbiguousTypes When checking the class method: put :: forall a. Put a => a -> [()] In the class declaration for ‘Put’ + +T7437.hs:14:13: error: [GHC-72771] + • The default type signature for put: + forall t. (Generic t, GPut (Rep t)) => t -> [()] + does not match its corresponding non-default type signature + • When checking the class method: + put :: forall a. Put a => a -> [()] + In the class declaration for ‘Put’ + ===================================== testsuite/tests/typecheck/should_fail/tcfail019.stderr ===================================== @@ -1,10 +1,10 @@ - tcfail019.hs:18:10: error: [GHC-39999] - • No instance for ‘B [a]’ + • No instance for ‘C [a]’ arising from the superclasses of an instance declaration • In the instance declaration for ‘D [a]’ tcfail019.hs:18:10: error: [GHC-39999] - • No instance for ‘C [a]’ + • No instance for ‘B [a]’ arising from the superclasses of an instance declaration • In the instance declaration for ‘D [a]’ + View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d2286d58c40bba550efdf12b2870b6… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/d2286d58c40bba550efdf12b2870b6… 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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