[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 6 commits: template-haskell: Better describe getQ semantics

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: 741da00c by Ben Gamari at 2025-11-12T03:38:20-05:00 template-haskell: Better describe getQ semantics Clarify that the state is a type-indexed map, as suggested by #26484. - - - - - 8b080e04 by ARATA Mizuki at 2025-11-12T03:39:11-05:00 Fix incorrect markups in the User's Guide * Correct markup for C--: "C-\-" in reST * Fix internal links * Fix code highlighting * Fix inline code: Use ``code`` rather than `code` * Remove extra backslashes Fixes #16812 Co-authored-by: sheaf - - - - - 1c1fdc28 by sheaf at 2025-11-14T11:56:40+01:00 SimpleOpt: refactor & push coercions into lambdas This commit improves the simple optimiser (in GHC.Core.SimpleOpt) in a couple of ways: - The logic to push coercion lambdas is shored up. The function 'pushCoercionIntoLambda' used to be called in 'finish_app', but this meant we could not continue to optimise the program after performing this transformation. Now, we call 'pushCoercionIntoLambda' as part of 'simple_app'. Doing so can be important when dealing with unlifted newtypes, as explained in Note [Desugaring unlifted newtypes]. - The code is re-structured to avoid duplication and out-of-sync code paths. Now, 'simple_opt_expr' defers to 'simple_app' for the 'App', 'Var', 'Cast' and 'Lam' cases. This means all the logic for those is centralised in a single place (e.g. the 'go_lam' helper function). To do this, the general structure is brought a bit closer to the full-blown simplifier, with a notion of 'continuation' (see 'SimpleContItem'). This commit also modifies GHC.Core.Opt.Arity.pushCoercionIntoLambda to apply a substitution (a slight generalisation of its existing implementation). - - - - - 4d7542db by sheaf at 2025-11-14T11:56:40+01:00 Improve typechecking of data constructors This commit changes the way in which we perform typecheck data constructors, in particular how we make multiplicities line up. Now, impedance matching occurs as part of the existing subsumption machinery. See the revamped Note [Typechecking data constructors] in GHC.Tc.Gen.App, as well as Note [Polymorphisation of linear fields] in GHC.Core.Multiplicity. This allows us to get rid of a fair amount of hacky code that was added with the introduction of LinearTypes; in particular the logic of GHC.Tc.Gen.Head.tcInferDataCon. ------------------------- Metric Decrease: T10421 T14766 T15164 T15703 T5642 T9630 WWRec ------------------------- - - - - - 88bf029e by sheaf at 2025-11-14T11:56:41+01:00 Handle unsaturated rep-poly newtypes This commit allows GHC to handle unsaturated occurrences of unlifted newtype constructors. The plan is detailed in Note [Eta-expanding rep-poly unlifted newtypes] in GHC.Tc.Utils.Concrete: for unsaturated unlifted newtypes, we perform the appropriate representation-polymorphism check in tcInstFun. - - - - - a604dd87 by Simon Peyton Jones at 2025-11-14T13:39:51-05:00 Make TYPE and CONSTRAINT apart again This patch finally fixes #24279. * The story started with #11715 * Then #21623 articulated a plan, which made Type and Constraint not-apart; a horrible hack but it worked. The main patch was commit 778c6adca2c995cd8a1b84394d4d5ca26b915dac Author: Simon Peyton Jones Date: Wed Nov 9 10:33:22 2022 +0000 Type vs Constraint: finally nailed * #24279 reported a bug in the above big commit; this small patch fixes it commit af6932d6c068361c6ae300d52e72fbe13f8e1f18 Author: Simon Peyton Jones Date: Mon Jan 8 10:49:49 2024 +0000 Make TYPE and CONSTRAINT not-apart Issue #24279 showed up a bug in the logic in GHC.Core.Unify.unify_ty which is supposed to make TYPE and CONSTRAINT be not-apart. * Then !10479 implemented "unary classes". * That change in turn allows us to make Type and Constraint apart again, cleaning up the compiler and allowing a little bit more expressiveness. It fixes the original hope in #24279, namely that `Type` and `Constraint` should be distinct throughout. - - - - - 111 changed files: - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/RoughMap.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Driver/Config/Core/Lint.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Syn/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Expr.hs-boot - compiler/GHC/Tc/Gen/Head.hs - compiler/GHC/Tc/Gen/Match.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Id/Make.hs - docs/users_guide/9.16.1-notes.rst - docs/users_guide/bugs.rst - docs/users_guide/debug-info.rst - docs/users_guide/debugging.rst - docs/users_guide/extending_ghc.rst - docs/users_guide/exts/arrows.rst - docs/users_guide/exts/derive_any_class.rst - docs/users_guide/exts/deriving_extra.rst - docs/users_guide/exts/deriving_inferred.rst - docs/users_guide/exts/deriving_strategies.rst - docs/users_guide/exts/gadt.rst - docs/users_guide/exts/generics.rst - docs/users_guide/exts/overloaded_labels.rst - docs/users_guide/exts/overloaded_strings.rst - docs/users_guide/exts/pattern_synonyms.rst - docs/users_guide/exts/poly_kinds.rst - docs/users_guide/exts/primitives.rst - docs/users_guide/exts/rank_polymorphism.rst - docs/users_guide/exts/rebindable_syntax.rst - docs/users_guide/exts/required_type_arguments.rst - docs/users_guide/exts/scoped_type_variables.rst - docs/users_guide/exts/standalone_deriving.rst - docs/users_guide/exts/template_haskell.rst - docs/users_guide/exts/tuple_sections.rst - docs/users_guide/exts/type_data.rst - docs/users_guide/exts/type_defaulting.rst - docs/users_guide/gone_wrong.rst - docs/users_guide/hints.rst - docs/users_guide/javascript.rst - docs/users_guide/phases.rst - docs/users_guide/profiling.rst - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - docs/users_guide/wasm.rst - docs/users_guide/win32-dlls.rst - libraries/ghc-internal/src/GHC/Internal/TH/Monad.hs - testsuite/tests/diagnostic-codes/codes.stdout - testsuite/tests/ghci/scripts/T8959b.stderr - testsuite/tests/ghci/scripts/ghci051.stderr - testsuite/tests/indexed-types/should_compile/T12538.stderr - testsuite/tests/indexed-types/should_fail/T21092.hs - − testsuite/tests/indexed-types/should_fail/T21092.stderr - testsuite/tests/indexed-types/should_fail/all.T - + testsuite/tests/linear/should_compile/LinearEtaExpansions.hs - testsuite/tests/linear/should_compile/all.T - testsuite/tests/linear/should_fail/TypeClass.hs - testsuite/tests/linear/should_fail/TypeClass.stderr - testsuite/tests/linear/should_run/LinearGhci.stdout - testsuite/tests/numeric/should_compile/T16402.stderr-ws-64 - testsuite/tests/parser/should_compile/DumpTypecheckedAst.stderr - testsuite/tests/perf/compiler/all.T - testsuite/tests/rep-poly/RepPolyCase1.stderr - − testsuite/tests/rep-poly/RepPolyCase2.stderr - testsuite/tests/rep-poly/RepPolyRule3.stderr - testsuite/tests/rep-poly/RepPolyTuple4.stderr - testsuite/tests/rep-poly/T13233.stderr - − testsuite/tests/rep-poly/T17021.stderr - testsuite/tests/rep-poly/T20363b.stderr - − testsuite/tests/rep-poly/T21650_a.stderr - − testsuite/tests/rep-poly/T21650_b.stderr - + testsuite/tests/rep-poly/T26072.hs - testsuite/tests/rep-poly/UnliftedNewtypesLevityBinder.stderr - testsuite/tests/rep-poly/all.T - testsuite/tests/typecheck/should_fail/T15883e.stderr - testsuite/tests/typecheck/should_fail/T2414.stderr - testsuite/tests/typecheck/should_fail/T24279.hs - − testsuite/tests/typecheck/should_fail/T24279.stderr - testsuite/tests/typecheck/should_fail/T2534.stderr - testsuite/tests/typecheck/should_fail/T7264.stderr - testsuite/tests/typecheck/should_fail/all.T - utils/haddock/hypsrc-test/ref/src/Classes.html - utils/haddock/hypsrc-test/ref/src/Quasiquoter.html The diff was not included because it is too large. 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