Apoorv Ingle pushed to branch wip/spj-apporv-Oct24 at Glasgow Haskell Compiler / GHC Commits: e64b3f16 by ARATA Mizuki at 2025-06-17T10:13:42+09:00 MachRegs.h: Don't define NO_ARG_REGS when a XMM register is defined On i386, MAX_REAL_VANILLA_REG is 1, but MAX_REAL_XMM_REG is 4. If we define NO_ARG_REGS on i386, programs that use SIMD vectors may segfault. Closes #25985 A couple of notes on the BROKEN_TESTS field: * This fixes the segfault from T25062_V16. * The failure from T22187_run was fixed in an earlier commit (see #25561), but BROKEN_TESTS was missed at that time. Now should be a good time to mark it fixed. - - - - - 3e7c6b4d by Matthew Pickering at 2025-06-18T15:34:04-04:00 Improve error messages when implicit lifting fails This patch concerns programs which automatically try to fix level errors by inserting `Lift`. For example: ``` foo x = [| x |] ~> foo x = [| $(lift x) |] ``` Before, there were two problems with the message. 1. (#26031), the location of the error was reported as the whole quotation. 2. (#26035), the message just mentions there is no Lift instance, but gives no indicate why the user program needed a Lift instance in the first place. This problem is especially bad when you disable `ImplicitStagePersistence`, so you just end up with a confusing "No instance for" message rather than an error message about levels This patch fixes both these issues. Firstly, `PendingRnSplice` differentiates between a user-written splice and an implicit lift. Then, the Lift instance is precisely requested with a specific origin in the typechecker. If the instance fails to be solved, the message is reported using the `TcRnBadlyLevelled` constructor (like a normal level error). Fixes #26031, #26035 - - - - - 44b8cee2 by Cheng Shao at 2025-06-18T15:34:46-04:00 testsuite: add T26120 marked as broken - - - - - 894a04f3 by Cheng Shao at 2025-06-18T15:34:46-04:00 compiler: fix GHC.SysTools.Ar archive member size writing logic This patch fixes a long-standing bug in `GHC.SysTools.Ar` that emits the wrong archive member size in each archive header. It should encode the exact length of the member payload, excluding any padding byte, otherwise malformed archive that extracts a broken object with an extra trailing byte could be created. Apart from the in-tree `T26120` test, I've also created an out-of-tree testsuite at https://github.com/TerrorJack/ghc-ar-quickcheck that contains QuickCheck roundtrip tests for `GHC.SysTools.Ar`. With this fix, simple roundtrip tests and `writeGNUAr`/GNU `ar` roundtrip test passes. There might be more bugs lurking in here, but this patch is still a critical bugfix already. Fixes #26120 #22586. Co-authored-by: Codex - - - - - f677ab5f by Lauren Yim at 2025-06-18T15:35:37-04:00 fix some typos in the warnings page in the user guide - - - - - b968e1c1 by Rodrigo Mesquita at 2025-06-18T15:36:18-04:00 Add a frozen callstack to throwGhcException Fixes #25956 - - - - - a5e0c3a3 by fendor at 2025-06-18T15:36:59-04:00 Update using.rst to advertise full mhu support for GHCi - - - - - d3e60e97 by Ryan Scott at 2025-06-18T22:29:21-04:00 Deprecate -Wdata-kinds-tc, make DataKinds issues in typechecker become errors !11314 introduced the `-Wdata-kinds-tc` warning as part of a fix for #22141. This was a temporary stopgap measure to allow users who were accidentally relying on code which needed the `DataKinds` extension in order to typecheck without having to explicitly enable the extension. Now that some amount of time has passed, this patch deprecates `-Wdata-kinds-tc` and upgrades any `DataKinds`-related issues in the typechecker (which were previously warnings) into errors. - - - - - fd5b5177 by Ryan Hendrickson at 2025-06-18T22:30:06-04:00 haddock: Add redact-type-synonyms pragma `{-# OPTIONS_HADDOCK redact-type-synonyms #-}` pragma will hide the RHS of type synonyms, and display the result kind instead, if the RHS contains any unexported types. - - - - - fbc0b92a by Vladislav Zavialov at 2025-06-22T04:25:16+03:00 Visible forall in GADTs (#25127) Add support for visible dependent quantification `forall a -> t` in types of data constructors, e.g. data KindVal a where K :: forall k. forall (a::k) -> -- now allowed! k -> KindVal a For details, see docs/users_guide/exts/required_type_arguments.rst, which has gained a new subsection. DataCon in compiler/GHC/Core/DataCon.hs --------------------------------------- The main change in this patch is that DataCon, the Core representation of a data constructor, now uses a different type to store user-written type variable binders: - dcUserTyVarBinders :: [InvisTVBinder] + dcUserTyVarBinders :: [TyVarBinder] where type TyVarBinder = VarBndr TyVar ForAllTyFlag type InvisTVBinder = VarBndr TyVar Specificity and data Specificity = InferredSpec | SpecifiedSpec data ForAllTyFlag = Invisible Specificity | Required This change necessitates some boring, mechanical changes scattered throughout the diff: ... is now used in place of ... -----------------+--------------- TyVarBinder | InvisTVBinder IfaceForAllBndr | IfaceForAllSpecBndr Specified | SpecifiedSpec Inferred | InferredSpec mkForAllTys | mkInvisForAllTys additionally, tyVarSpecToBinders -- added or removed calls ifaceForAllSpecToBndrs -- removed calls Visibility casts in mkDataConRep -------------------------------- Type abstractions in Core (/\a. e) always have type (forall a. t) because coreTyLamForAllTyFlag = Specified. This is also true of data constructor workers. So we may be faced with the following: data con worker: (forall a. blah) data con wrapper: (forall a -> blah) In this case the wrapper must use a visibility cast (e |> ForAllCo ...) with appropriately set fco_vis{L,R}. Relevant functions: mkDataConRep in compiler/GHC/Types/Id/Make.hs dataConUserTyVarBindersNeedWrapper in compiler/GHC/Core/DataCon.hs mkForAllVisCos in compiler/GHC/Core/Coercion.hs mkCoreTyLams in compiler/GHC/Core/Make.hs mkWpForAllCast in compiler/GHC/Tc/Types/Evidence.hs More specifically: - dataConUserTyVarBindersNeedWrapper has been updated to answer "yes" if there are visible foralls in the type of the data constructor. - mkDataConRep now uses mkCoreTyLams to generate the big lambda abstractions (/\a b c. e) in the data con wrapper. - mkCoreTyLams is a variant of mkCoreLams that applies visibility casts as needed. It similar in purpose to the pre-existing mkWpForAllCast, so the common bits have been factored out into mkForAllVisCos. ConDecl in compiler/Language/Haskell/Syntax/Decls.hs ---------------------------------------------------- The surface syntax representation of a data constructor declaration is ConDecl. In accordance with the proposal, only GADT syntax is extended with support for visible forall, so we are interested in ConDeclGADT. ConDeclGADT's field con_bndrs has been renamed to con_outer_bndrs and is now accompanied by con_inner_bndrs: con_outer_bndrs :: XRec pass (HsOuterSigTyVarBndrs pass) con_inner_bndrs :: [HsForAllTelescope pass] Visible foralls always end up in con_inner_bndrs. The outer binders are stored and processed separately to support implicit quantification and the forall-or-nothing rule, a design established by HsSigType. A side effect of this change is that even in absence of visible foralls, GHC now permits multiple invisible foralls, e.g. data T a where { MkT :: forall a b. forall c d. ... -> T a } But of course, this is done in service of making at least some of these foralls visible. The entire compiler front-end has been updated to deal with con_inner_bndrs. See the following modified or added functions: Parser: mkGadtDecl in compiler/GHC/Parser/PostProcess.hs splitLHsGadtTy in compiler/GHC/Hs/Type.hs Pretty-printer: pprConDecl in compiler/GHC/Hs/Decls.hs pprHsForAllTelescope in compiler/GHC/Hs/Type.hs Renamer: rnConDecl in compiler/GHC/Rename/Module.hs bindHsForAllTelescopes in compiler/GHC/Rename/HsType.hs extractHsForAllTelescopes in compiler/GHC/Rename/HsType.hs Type checker: tcConDecl in compiler/GHC/Tc/TyCl.hs tcGadtConTyVarBndrs in compiler/GHC/Tc/Gen/HsType.hs Template Haskell ---------------- The TH AST is left unchanged for the moment to avoid breakage. An attempt to quote or reify a data constructor declaration with visible forall in its type will result an error: data ThRejectionReason -- in GHC/HsToCore/Errors/Types.hs = ... | ThDataConVisibleForall -- new error constructor However, as noted in the previous section, GHC now permits multiple invisible foralls, and TH was updated accordingly. Updated code: repC in compiler/GHC/HsToCore/Quote.hs reifyDataCon in compiler/GHC/Tc/Gen/Splice.hs ppr @Con in libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs Pattern matching ---------------- Everything described above concerns data constructor declarations, but what about their use sites? Now it is trickier to type check a pattern match fn(Con a b c)=... because we can no longer assume that a,b,c are all value arguments. Indeed, some or all of them may very well turn out to be required type arguments. To that end, see the changes to: tcDataConPat in compiler/GHC/Tc/Gen/Pat.hs splitConTyArgs in compiler/GHC/Tc/Gen/Pat.hs and the new helpers split_con_ty_args, zip_pats_bndrs. This is also the reason the TcRnTooManyTyArgsInConPattern error constructor has been removed. The new code emits TcRnArityMismatch or TcRnIllegalInvisibleTypePattern. Summary ------- DataCon, ConDecl, as well as all related functions have been updated to support required type arguments in data constructors. Test cases: HieGadtConSigs GadtConSigs_th_dump1 GadtConSigs_th_pprint1 T25127_data T25127_data_inst T25127_infix T25127_newtype T25127_fail_th_quote T25127_fail_arity TyAppPat_Tricky Co-authored-by: mniip - - - - - ae003a3a by Teo Camarasu at 2025-06-23T05:21:48-04:00 linters: lint-whitespace: bump upper-bound for containers The version of containers was bumped in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13989 - - - - - 1f1c2b63 by Apoorv Ingle at 2025-06-23T12:10:51-05:00 - Remove one `SrcSpan` field from `VAExpansion`. It is no longer needed. - Make `tcExpr` take a `Maybe HsThingRn` which will be passed on to tcApp and used by splitHsApps to determine a more accurate `AppCtx` - `tcXExpr` is less hacky now - do not look through HsExpansion applications - kill OrigPat and remove HsThingRn From VAExpansion - look through XExpr ExpandedThingRn while inferring type of head - always set in generated code after stepping inside a ExpandedThingRn - fixing record update error messages - remove special case of tcbody from tcLambdaMatches - wrap last stmt expansion in a HsPar so that the error messages are prettier - remove special case of dsExpr for ExpandedThingTc - make EExpand (HsExpr GhcRn) instead of EExpand HsThingRn - fixing error messages for rebindable - - - - - 1835148b by Apoorv Ingle at 2025-06-23T12:10:51-05:00 some progress on tick - - - - - 6b8722cb by Apoorv Ingle at 2025-06-23T12:10:51-05:00 remove adhoc cases from ticks - - - - - b55fcb1c by Apoorv Ingle at 2025-06-23T12:10:51-05:00 fix the case where head of the application chain is an expanded expression and the argument is a type application c.f. T19167.hs - - - - - c66ace87 by Apoorv Ingle at 2025-06-23T12:10:51-05:00 move setQLInstLevel inside tcInstFun - - - - - fd05047f by Apoorv Ingle at 2025-06-23T12:10:51-05:00 ignore ds warnings originating from gen locations - - - - - af54d265 by Apoorv Ingle at 2025-06-23T12:10:51-05:00 filter expr stmts error msgs - - - - - 2ee245fd by Apoorv Ingle at 2025-06-23T12:10:51-05:00 exception for AppDo while making error ctxt - - - - - d6f6f649 by Apoorv Ingle at 2025-06-23T12:10:51-05:00 moving around things for locations and error ctxts - - - - - 78f91709 by Apoorv Ingle at 2025-06-23T12:10:52-05:00 popErrCtxt doesn't push contexts and popErrCtxts in the first argument to bind and >> in do expansion statements - - - - - 76c62744 by Apoorv Ingle at 2025-06-23T12:10:52-05:00 accept test cases with changed error messages ------------------------- Metric Decrease: T9020 ------------------------- - - - - - 626865ed by Apoorv Ingle at 2025-06-23T12:10:52-05:00 look through PopErrCtxt while splitting exprs in application chains - - - - - a2eba186 by Apoorv Ingle at 2025-06-23T12:10:52-05:00 remove special case for HsExpanded in Ticks - - - - - 7bd577b8 by Apoorv Ingle at 2025-06-23T12:10:52-05:00 check the right origin for record selector incomplete warnings - - - - - c96743a8 by Apoorv Ingle at 2025-06-23T12:10:52-05:00 kill VAExpansion - - - - - f5cb1107 by Apoorv Ingle at 2025-06-23T12:10:52-05:00 pass CtOrigin to tcApp for instantiateSigma - - - - - 08e22fde by Apoorv Ingle at 2025-06-23T12:10:52-05:00 do not suppress pprArising - - - - - e0f457e1 by Apoorv Ingle at 2025-06-23T12:11:25-05:00 kill VACall - - - - - 441f13ca by Apoorv Ingle at 2025-06-23T12:11:29-05:00 kill AppCtxt - - - - - 9fb913b8 by Apoorv Ingle at 2025-06-23T12:11:29-05:00 remove addHeadCtxt - - - - - 1777e9d2 by Apoorv Ingle at 2025-06-23T12:11:29-05:00 fix pprArising for MonadFailErrors - - - - - 1ca5a81f by Apoorv Ingle at 2025-06-23T12:11:29-05:00 rename ctxt to sloc - - - - - a49006c0 by Apoorv Ingle at 2025-06-23T12:11:29-05:00 fix RepPolyDoBind error message herald - - - - - e83473b8 by Apoorv Ingle at 2025-06-23T12:11:29-05:00 SrcCodeCtxt more changes - - - - - 99488532 by Apoorv Ingle at 2025-06-23T17:03:41-05:00 make tcl_in_gen_code a SrcCodeCtxt and rename DoOrigin to DoStmtOrigin - - - - - 202 changed files: - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - compiler/GHC/Builtin/Types.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/ConLike.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/DataCon.hs-boot - compiler/GHC/Core/Make.hs - compiler/GHC/Core/PatSyn.hs - compiler/GHC/Core/TyCo/Ppr.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/HsToCore/Errors/Ppr.hs - compiler/GHC/HsToCore/Errors/Types.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Pmc.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Iface/Decl.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Parser/PostProcess/Haddock.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/SysTools/Ar.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/App.hs-boot - compiler/GHC/Tc/Gen/Do.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Head.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Match.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Splice.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/Build.hs - compiler/GHC/Tc/TyCl/Utils.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/LclEnv.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Validity.hs - compiler/GHC/ThToHs.hs - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/Var.hs-boot - compiler/GHC/Utils/Panic.hs - compiler/Language/Haskell/Syntax/Decls.hs - compiler/Language/Haskell/Syntax/Pat.hs - docs/users_guide/9.14.1-notes.rst - docs/users_guide/exts/gadt_syntax.rst - docs/users_guide/exts/required_type_arguments.rst - docs/users_guide/using-warnings.rst - docs/users_guide/using.rst - libraries/ghc-boot-th/GHC/Boot/TH/Ppr.hs - linters/lint-whitespace/lint-whitespace.cabal - rts/include/stg/MachRegs.h - testsuite/tests/annotations/should_fail/annfail03.stderr - testsuite/tests/annotations/should_fail/annfail09.stderr - testsuite/tests/deSugar/should_compile/T10662.stderr - testsuite/tests/deSugar/should_compile/T3263-1.stderr - testsuite/tests/deSugar/should_compile/T3263-2.stderr - testsuite/tests/default/default-fail05.stderr - testsuite/tests/dependent/should_fail/T16326_Fail6.stderr - + testsuite/tests/ghc-api/T26120.hs - + testsuite/tests/ghc-api/T26120.stdout - 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utils/haddock/haddock-api/src/Haddock/Interface/Create.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/InterfaceFile.hs - utils/haddock/haddock-api/src/Haddock/Types.hs - + utils/haddock/html-test/ref/RedactTypeSynonyms.html - + utils/haddock/html-test/src/RedactTypeSynonyms.hs - + utils/haddock/latex-test/ref/RedactTypeSynonyms/RedactTypeSynonyms.tex - + utils/haddock/latex-test/src/RedactTypeSynonyms/RedactTypeSynonyms.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/f7f418af96e46614c0dc2ff09935e5a... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/f7f418af96e46614c0dc2ff09935e5a... You're receiving this email because of your account on gitlab.haskell.org.