Simon Peyton Jones pushed to branch wip/T23162-spj at Glasgow Haskell Compiler / GHC Commits: 14281a22 by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/nonmoving: Fix comment spelling - - - - - bedd38b0 by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/nonmoving: Use atomic operations to update bd->flags - - - - - 215d6841 by Ben Gamari at 2025-10-11T14:06:47-04:00 nonmoving: Use get_itbl instead of explicit loads This is cleaner and also fixes unnecessary (and unsound) use of `volatile`. - - - - - 2c94aa3a by Ben Gamari at 2025-10-11T14:06:47-04:00 rts/Scav: Handle WHITEHOLEs in scavenge_one `scavenge_one`, used to scavenge mutable list entries, may encounter `WHITEHOLE`s when the non-moving GC is in use via two paths: 1. when an MVAR is being marked concurrently 2. when the object belongs to a chain of selectors being short-cutted. Fixes #26204. - - - - - 6bd8155c by Matthew Pickering at 2025-10-11T14:07:29-04:00 Add support for generating bytecode objects This commit adds the `-fwrite-byte-code` option which makes GHC emit a `.gbc` file which contains a serialised representation of bytecode. The bytecode can be loaded by the compiler to avoid having to reinterpret a module when using the bytecode interpreter (for example, in GHCi). There are also the new options: * -gbcdir=<DIR>: Specify the directory to place the gbc files * -gbcsuf=<suffix>: Specify the suffix for gbc files The option `-fbyte-code-and-object-code` now implies `-fwrite-byte-code`. These performance tests fail due to https://github.com/haskell/directory/issues/204 ------------------------- Metric Increase: MultiComponentModules MultiLayerModules MultiComponentModulesRecomp MultiLayerModulesRecomp MultiLayerModulesTH_Make MultiLayerModulesTH_OneShot T13701 ------------------------- The bytecode serialisation part was implemented by Cheng Shao Co-authored-by: Cheng Shao - - - - - dc8f9599 by Matthew Pickering at 2025-10-11T14:07:30-04:00 Revert "Add a perf test for #26425" This test has a large memory spike currently, which makes the test sensitive, since if you allocate a little more or less, the precise location where GC happens shifts and you observe a different part of the spike. Andreas told me to revert the patch for now, and he will add it back when he fixes the memory spike. This reverts commit 41bdb16fd083110a06507248f648c507a2feb4af. - - - - - e10dcd65 by Sven Tennie at 2025-10-12T10:24:56+00:00 T22859: Increase threadDelay for small machines The previously used thread delay led to failures on my RISC-V test setups. - - - - - d59ef6b6 by Hai / @BestYeen at 2025-10-14T21:51:14-04:00 Change Alex and Happy m4 scripts to display which version was found in the system, adapt small formatting details in Happy script to be more like the Alex script again. - - - - - c98abb6a by Hai / @BestYeen at 2025-10-14T21:52:08-04:00 Update occurrences of return to pure and add a sample for redefining :m to mean :main - - - - - 70ee825a by Cheng Shao at 2025-10-14T21:52:50-04:00 testsuite: fix T3586 for non-SSE3 platforms `T3586.hs` contains `-fvia-C -optc-msse3` which I think is a best-effort basis to harvest the C compiler's auto vectorization optimizations via the C backend back when the test was added. The `-fvia-C` part is now a deprecated no-op because GHC can't fall back to the C backend on a non-unregisterised build, and `-optc-msse3` might actually cause the test to fail on non x86/x64 platforms, e.g. recent builds of wasi-sdk would report `wasm32-wasi-clang: error: unsupported option '-msse3' for target 'wasm32-unknown-wasi'`. So this patch cleans up this historical cruft. `-fvia-C` is removed, and `-optc-msse3` is only passed when cpuid contains `pni` (which indicates support of SSE3). - - - - - 4be32153 by Teo Camarasu at 2025-10-15T08:06:09-04:00 Add submodules for template-haskell-lift and template-haskell-quasiquoter These two new boot libraries expose stable subsets of the template-haskell interface. This is an implemenation of the GHC proposal https://github.com/ghc-proposals/ghc-proposals/pull/696 Work towards #25262 - - - - - 0c00c9c3 by Ben Gamari at 2025-10-15T08:06:51-04:00 rts: Eliminate uses of implicit constant arrays Folding of `const`-sized variable-length arrays to a constant-length array is a gnu extension which clang complains about. Closes #26502. - - - - - bf902a1d by Fendor at 2025-10-15T16:00:59-04:00 Refactor distinct constructor tables map construction Adds `GHC.Types.Unique.FM.alterUFM_L`, `GHC.Types.Unique.DFM.alterUDFM_L` `GHC.Data.Word64Map.alterLookup` to support fusion of distinct constructor data insertion and lookup during the construction of the `DataCon` map in `GHC.Stg.Debug.numberDataCon`. Co-authored-by: Fendor Co-authored-by: Finley McIlwaine - - - - - b3585ba1 by Fendor at 2025-10-15T16:00:59-04:00 Allow per constructor refinement of distinct-constructor-tables Introduce `-fno-distinct-constructor-tables`. A distinct constructor table configuration is built from the combination of flags given, in order. For example, to only generate distinct constructor tables for a few specific constructors and no others, just pass `-fdistinct-constructor-tables-only=C1,...,CN`. This flag can be supplied multiple times to extend the set of constructors to generate a distinct info table for. You can disable generation of distinct constructor tables for all configurations by passing `-fno-distinct-constructor-tables`. The various configurations of these flags is included in the `DynFlags` fingerprints, which should result in the expected recompilation logic. Adds a test that checks for distinct tables for various given or omitted constructors. Updates CountDepsAst and CountDepsParser tests to account for new dependencies. Fixes #23703 Co-authored-by: Fendor Co-authored-by: Finley McIlwaine - - - - - e17dc695 by fendor at 2025-10-15T16:01:41-04:00 Fix typos in haddock documentation for stack annotation API - - - - - f85058d3 by Zubin Duggal at 2025-10-17T13:50:52+05:30 compiler: Attempt to systematize Unique tags by introducing an ADT for each different tag Fixes #26264 Metric Decrease: T9233 - - - - - c85c845d by sheaf at 2025-10-17T22:35:32-04:00 Don't prematurely final-zonk PatSyn declarations This commit makes GHC hold off on the final zonk for pattern synonym declarations, in 'GHC.Tc.TyCl.PatSyn.tc_patsyn_finish'. This accommodates the fact that pattern synonym declarations without a type signature can contain unfilled metavariables, e.g. if the RHS of the pattern synonym involves view-patterns whose type mentions promoted (level 0) metavariables. Just like we do for ordinary function bindings, we should allow these metavariables to be settled later, instead of eagerly performing a final zonk-to-type. Now, the final zonking-to-type for pattern synonyms is performed in GHC.Tc.Module.zonkTcGblEnv. Fixes #26465 - - - - - ba3e5bdd by Rodrigo Mesquita at 2025-10-18T16:57:18-04:00 Move code-gen aux symbols from ghc-internal to rts These symbols were all previously defined in ghc-internal and made the dependency structure awkward, where the rts may refer to some of these symbols and had to work around that circular dependency the way described in #26166. Moreover, the code generator will produce code that uses these symbols! Therefore, they should be available in the rts: PRINCIPLE: If the code generator may produce code which uses this symbol, then it should be defined in the rts rather than, say, ghc-internal. That said, the main motivation is towards fixing #26166. Towards #26166. Pre-requisite of !14892 - - - - - f31de2a9 by Ben Gamari at 2025-10-18T16:57:18-04:00 rts: Avoid static symbol references to ghc-internal This resolves #26166, a bug due to new constraints placed by Apple's linker on undefined references. One source of such references in the RTS is the many symbols referenced in ghc-internal. To mitigate #26166, we make these references dynamic, as described in Note [RTS/ghc-internal interface]. Fixes #26166 Co-authored-by: Rodrigo Mesquita Co-authored-by: Cheng Shao - - - - - 43fdfddc by Ben Gamari at 2025-10-18T16:57:18-04:00 compiler: Rename isMathFun -> isLibcFun This set includes more than just math functions. - - - - - 4ed5138f by Ben Gamari at 2025-10-18T16:57:18-04:00 compiler: Add libc allocator functions to libc_funs Prototypes for these are now visible from `Prim.h`, resulting in multiple-declaration warnings in the unregisterised job. - - - - - 9a0a076b by Ben Gamari at 2025-10-18T16:57:18-04:00 rts: Minimize header dependencies of Prim.h Otherwise we will end up with redundant and incompatible declarations resulting in warnings during the unregisterised build. - - - - - 26b8a414 by Diego Antonio Rosario Palomino at 2025-10-18T16:58:10-04:00 Cmm Parser: Fix incorrect example in comment The Parser.y file contains a comment with an incorrect example of textual Cmm (used in .cmm files). This commit updates the comment to ensure it reflects valid textual Cmm syntax. Fixes #26313 - - - - - 67831474 by Richard Eisenberg at 2025-10-21T16:13:25+01:00 Refactor fundep solving This commit is a large-scale refactor of the increasingly-messy code that handles functional dependencies. It has virtually no effect on what compiles but improves error messages a bit. And it does the groundwork for #23162. The big picture is described in Note [Overview of functional dependencies in type inference] in GHC.Tc.Solver.FunDeps * New module GHC.Tc.Solver.FunDeps contains all the fundep-handling code for the constraint solver. * Fundep-equalities are solved in a nested scope; they may generate unifications but otherwise have no other effect. See GHC.Tc.Solver.FunDeps.solveFunDeps The nested needs to start from the Givens in the inert set, but not the Wanteds; hence a new function `resetInertCans`, used in `nestFunDepsTcS`. * That in turn means that fundep equalities never show up in error messages, so the complicated FunDepOrigin tracking can all disappear. * We need to be careful about tracking unifications, so we kick out constraints from the inert set after doing unifications. Unification tracking has been majorly reformed: see Note [WhatUnifications] in GHC.Tc.Utils.Unify. A good consequence is that the hard-to-grok `resetUnificationFlag` has been replaced with a simpler use of `reportCoarseGrainUnifications` Smaller things: * Rename `FunDepEqn` to `FunDepEqns` since it contains multiple type equalities. Some compile time improvement Metrics: compile_time/bytes allocated Baseline Test value New value Change ---------------------- -------------------------------------- T5030(normal) 173,839,232 148,115,248 -14.8% GOOD hard_hole_fits(normal) 286,768,048 284,015,416 -1.0% geo. mean -0.2% minimum -14.8% maximum +0.3% Metric Decrease: T5030 - - - - - 51194dc2 by Simon Peyton Jones at 2025-10-21T16:13:25+01:00 QuickLook's tcInstFun should make instantiation variables directly tcInstFun must make "instantiation variables", not regular unification variables, when instantiating function types. That was previously implemented by a hack: set the /ambient/ level to QLInstTyVar. But the hack finally bit me, when I was refactoring WhatUnifications. And it was always wrong: see the now-expunged (TCAPP2) note. This commit does it right, by making tcInstFun call its own instantiation functions. That entails a small bit of duplication, but the result is much, much cleaner. - - - - - 07273cef by Simon Peyton Jones at 2025-10-21T16:13:25+01:00 Build implication for constraints from (static e) This commit addresses #26466, by buiding an implication for the constraints arising from a (static e) form. The implication has a special ic_info field of StaticFormSkol, which tells the constraint solver to use an empty set of Givens. See (SF3) in Note [Grand plan for static forms] in GHC.Iface.Tidy.StaticPtrTable This commit also reinstates an `assert` in GHC.Tc.Solver.Equality. The test `StaticPtrTypeFamily` was failing with an assertion failure, but it now works. - - - - - 38e504b9 by Simon Peyton Jones at 2025-10-21T16:14:46+01:00 Comments about defaulting representation equalities - - - - - a6773e40 by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Improve kick-out after filling coercion holes The Note needs updating if CI is happy - - - - - 6d7dc48a by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Improve tracking of RewriterSets A bit experimental. Avoids taking the free coercion holes of a coercion, which can be expensive if the coercion is the result of a huge rewrite. The rewriter returns the RewriterSet! - - - - - 75cdeda3 by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Tidy up trySolveImplication This completes some leftover mess from commit 14123ee646f2b9738a917b7cec30f9d3941c13de Author: Simon Peyton Jones Date: Wed Aug 20 00:35:48 2025 +0100 Solve forall-constraints via an implication, again - - - - - 1537702b by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Big increment in rewriter tracking Needs more documentation More tidying up of rewriter sets - - - - - 4bc88e42 by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Do not treat CoercionHoles as free variables in coercions - - - - - 742cca9b by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Fix buglet in solving equalities from QCIs - - - - - 5ce894fa by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Improve equality checking for foralls a bit ...by re-using the TcEvBindsVar - - - - - 422876f4 by Simon Peyton Jones at 2025-10-21T16:15:03+01:00 Update debug-tracing in CallArity No effect on behaviour, and commented out anyway - - - - - 304 changed files: - .gitmodules - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/ByteCode/Breakpoints.hs - + compiler/GHC/ByteCode/Serialize.hs - compiler/GHC/ByteCode/Types.hs - compiler/GHC/Cmm/CLabel.hs - compiler/GHC/Cmm/Info.hs - compiler/GHC/Cmm/Info/Build.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/Cmm/Pipeline.hs - compiler/GHC/Cmm/UniqueRenamer.hs - compiler/GHC/CmmToAsm/Wasm/FromCmm.hs - compiler/GHC/CmmToC.hs - compiler/GHC/CmmToLlvm/Base.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Opt/CallArity.hs - compiler/GHC/Core/Opt/Monad.hs - compiler/GHC/Core/Opt/Pipeline.hs - compiler/GHC/Core/Opt/Simplify/Monad.hs - compiler/GHC/Core/PatSyn.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Data/FlatBag.hs - compiler/GHC/Data/SmallArray.hs - compiler/GHC/Data/Word64Map/Internal.hs - compiler/GHC/Data/Word64Map/Lazy.hs - compiler/GHC/Driver/Backend.hs - compiler/GHC/Driver/Backpack.hs - + compiler/GHC/Driver/ByteCode.hs - compiler/GHC/Driver/CodeOutput.hs - compiler/GHC/Driver/Config/Finder.hs - compiler/GHC/Driver/Config/Stg/Debug.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/Driver/Messager.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/HsToCore/Breakpoints.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Foreign/Wasm.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Usage.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Iface/Binary.hs - compiler/GHC/Iface/Flags.hs - compiler/GHC/Iface/Recomp/Flags.hs - compiler/GHC/Iface/Rename.hs - compiler/GHC/Iface/Tidy/StaticPtrTable.hs - compiler/GHC/JS/JStg/Monad.hs - compiler/GHC/Linker/Deps.hs - compiler/GHC/Linker/Dynamic.hs - compiler/GHC/Linker/Loader.hs - compiler/GHC/Linker/Static.hs - compiler/GHC/Linker/Types.hs - compiler/GHC/Platform/Reg.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Stg/Debug.hs - + compiler/GHC/Stg/Debug/Types.hs - compiler/GHC/Stg/EnforceEpt.hs - compiler/GHC/Stg/Pipeline.hs - compiler/GHC/StgToCmm/ExtCode.hs - compiler/GHC/StgToCmm/Monad.hs - compiler/GHC/StgToJS/CodeGen.hs - compiler/GHC/StgToJS/Ids.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Instance/FunDeps.hs - compiler/GHC/Tc/Module.hs - compiler/GHC/Tc/Solver.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - + compiler/GHC/Tc/Solver/FunDeps.hs - compiler/GHC/Tc/Solver/InertSet.hs - compiler/GHC/Tc/Solver/Irred.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/Solver/Solve.hs-boot - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Tc/Types.hs - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Instantiate.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Zonk/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Basic.hs - compiler/GHC/Types/Name/Cache.hs - compiler/GHC/Types/SptEntry.hs - compiler/GHC/Types/Tickish.hs - compiler/GHC/Types/Unique.hs - compiler/GHC/Types/Unique/DFM.hs - compiler/GHC/Types/Unique/DSM.hs - compiler/GHC/Types/Unique/FM.hs - compiler/GHC/Types/Unique/Supply.hs - compiler/GHC/Unit/Finder.hs - compiler/GHC/Unit/Finder/Types.hs - compiler/GHC/Unit/Module/Graph.hs - compiler/GHC/Unit/Module/Location.hs - compiler/GHC/Unit/Module/ModSummary.hs - compiler/GHC/Unit/Module/WholeCoreBindings.hs - compiler/GHC/Utils/Binary.hs - + compiler/GHC/Utils/EndoOS.hs - compiler/Language/Haskell/Syntax/Binds.hs - compiler/ghc.cabal.in - docs/users_guide/debug-info.rst - docs/users_guide/ghci.rst - docs/users_guide/phases.rst - docs/users_guide/separate_compilation.rst - hadrian/src/Packages.hs - hadrian/src/Settings/Default.hs - hadrian/src/Settings/Packages.hs - libraries/ghc-experimental/src/GHC/Stack/Annotation/Experimental.hs - + libraries/ghc-internal/cbits/RtsIface.c - libraries/ghc-internal/ghc-internal.cabal.in - + libraries/ghc-internal/include/RtsIfaceSymbols.h - libraries/ghc-internal/src/GHC/Internal/TH/Lift.hs - libraries/ghc-internal/src/GHC/Internal/TH/Quote.hs - + libraries/template-haskell-lift - + libraries/template-haskell-quasiquoter - m4/fptools_alex.m4 - m4/fptools_happy.m4 - rts/BuiltinClosures.c - rts/CloneStack.h - rts/Compact.cmm - rts/ContinuationOps.cmm - rts/Exception.cmm - rts/Prelude.h - rts/PrimOps.cmm - rts/Printer.c - rts/RtsAPI.c - rts/RtsStartup.c - rts/RtsSymbols.c - + rts/RtsToHsIface.c - rts/StgStdThunks.cmm - rts/configure.ac - − rts/external-symbols.list.in - rts/include/Rts.h - rts/include/RtsAPI.h - rts/include/Stg.h - + rts/include/rts/RtsToHsIface.h - rts/include/rts/Types.h - rts/include/rts/storage/Block.h - rts/include/stg/Prim.h - rts/posix/OSMem.c - rts/posix/Signals.c - libraries/ghc-internal/cbits/atomic.c → rts/prim/atomic.c - libraries/ghc-internal/cbits/bitrev.c → rts/prim/bitrev.c - libraries/ghc-internal/cbits/bswap.c → rts/prim/bswap.c - libraries/ghc-internal/cbits/clz.c → rts/prim/clz.c - libraries/ghc-internal/cbits/ctz.c → rts/prim/ctz.c - libraries/ghc-internal/cbits/int64x2minmax.c → rts/prim/int64x2minmax.c - libraries/ghc-internal/cbits/longlong.c → rts/prim/longlong.c - libraries/ghc-internal/cbits/mulIntMayOflo.c → rts/prim/mulIntMayOflo.c - libraries/ghc-internal/cbits/pdep.c → rts/prim/pdep.c - libraries/ghc-internal/cbits/pext.c → rts/prim/pext.c - libraries/ghc-internal/cbits/popcnt.c → rts/prim/popcnt.c - libraries/ghc-internal/cbits/vectorQuotRem.c → rts/prim/vectorQuotRem.c - libraries/ghc-internal/cbits/word2float.c → rts/prim/word2float.c - − rts/rts.buildinfo.in - rts/rts.cabal - rts/sm/NonMoving.c - rts/sm/NonMovingMark.c - rts/sm/Scav.c - rts/wasm/JSFFI.c - rts/wasm/scheduler.cmm - rts/win32/libHSghc-internal.def - testsuite/driver/cpu_features.py - testsuite/tests/bytecode/T24634/T24634a.stdout - testsuite/tests/bytecode/T24634/T24634b.stdout - testsuite/tests/count-deps/CountDepsAst.stdout - testsuite/tests/count-deps/CountDepsParser.stdout - testsuite/tests/default/default-fail05.stderr - testsuite/tests/dependent/should_fail/T13135_simple.stderr - testsuite/tests/deriving/should_fail/T3621.stderr - + testsuite/tests/driver/bytecode-object/A.hs - + testsuite/tests/driver/bytecode-object/BytecodeForeign.c - + testsuite/tests/driver/bytecode-object/BytecodeForeign.hs - + testsuite/tests/driver/bytecode-object/BytecodeMain.hs - + testsuite/tests/driver/bytecode-object/BytecodeTest.hs - + testsuite/tests/driver/bytecode-object/Makefile - + testsuite/tests/driver/bytecode-object/all.T - + testsuite/tests/driver/bytecode-object/bytecode_object12.stderr - + testsuite/tests/driver/bytecode-object/bytecode_object13.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object14.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object15.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object16.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object17.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object18.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object19.script - + testsuite/tests/driver/bytecode-object/bytecode_object19.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object25.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object4.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object5.stdout - + testsuite/tests/driver/bytecode-object/bytecode_object6.stdout - testsuite/tests/driver/fat-iface/T22405/T22405.stdout - testsuite/tests/driver/fat-iface/T22405/T22405b.stdout - testsuite/tests/driver/fat-iface/fat011.stderr - + testsuite/tests/ghc-api/T26264.hs - 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