[Git][ghc/ghc][wip/substitution-via-mapper] Make substitution strict
by Simon Peyton Jones (＠simonpj) 04 Aug '26
by Simon Peyton Jones (＠simonpj) 04 Aug '26
04 Aug '26
Simon Peyton Jones pushed to branch wip/substitution-via-mapper at Glasgow Haskell Compiler / GHC
Commits:
6b1cf29d by Simon Peyton Jones at 2026-08-04T14:37:34+01:00
Make substitution strict
It's nice that it is so easy to do so
- - - - -
5 changed files:
- compiler/GHC/Core/TyCo/Make.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/Type.hs
- + compiler/GHC/Utils/StrictIdentity.hs
- compiler/ghc.cabal.in
Changes:
=====================================
compiler/GHC/Core/TyCo/Make.hs
=====================================
@@ -48,14 +48,12 @@ module GHC.Core.TyCo.Make (
-- Coercions
, mkReflCo, mkNomReflCo, mkRepReflCo
, mkCoVarCo, mkCoVarCos, mkHoleCo
- , mkKindCo, mkSelCo
+ , mkKindCo
, mkGReflCo, mkGReflRightCo, mkGReflLeftCo
, mkGReflMCo, mkGReflRightMCo, mkGReflLeftMCo
, mkSubCo, mkSymCo, mkSymMCo
, mkFunCo2, mkForAllCo, mkUnivCo
, mkAxiomCo, mkUnbranchedAxInstCo
- , mkAppCo, mkTyConAppCo
- , mkInstCo, mkLRCo
, mkFunCo, mkNakedFunCo
, mkNakedForAllCo, mkForAllVisCos, mkHomoForAllCo, mkHomoForAllCos
, mkAxInstCo
@@ -83,7 +81,7 @@ module GHC.Core.TyCo.Make (
import GHC.Prelude
import {-# SOURCE #-} GHC.Core.Coercion
- ( mkLRCo, mkInstCo, mkAppCo, mkAppCos, mkTyConAppCo, mkSelCo
+ ( mkLRCo, mkInstCo, mkAppCo, mkAppCos, mkSelCo
, decomposePiCos
, isKindCo
, coercionKind -- Used in toPhantomCo
@@ -222,60 +220,60 @@ mapTyCoX (TyCoMapper { tcm_tyvar = tyvar
= (go_ty, go_tys, go_co, go_cos)
where
-- See Note [Use explicit recursion in mapTyCo]
- go_tys !_ [] = return []
- go_tys !env (ty:tys) = (:) <$> go_ty env ty <*> go_tys env tys
+ go_tys _ [] = return []
+ go_tys env (ty:tys) = (:) <$> go_ty env ty <*> go_tys env tys
- go_ty !env (TyVarTy tv) = tyvar env tv
- go_ty !env (AppTy t1 t2) = mkAppTy <$> go_ty env t1 <*> go_ty env t2
- go_ty !_ ty@(LitTy {}) = return ty
- go_ty !env (CastTy ty co) = mkCastTy <$> go_ty env ty <*> go_co env co
- go_ty !env (CoercionTy co) = CoercionTy <$> go_co env co
+ go_ty env (TyVarTy tv) = tyvar env tv
+ go_ty env (AppTy t1 t2) = mkAppTy <$> go_ty env t1 <*> go_ty env t2
+ go_ty _ ty@(LitTy {}) = return ty
+ go_ty env (CastTy ty co) = mkCastTy <$> go_ty env ty <*> go_co env co
+ go_ty env (CoercionTy co) = CoercionTy <$> go_co env co
- go_ty !env ty@(FunTy _ w arg res)
+ go_ty env ty@(FunTy _ w arg res)
= do { w' <- go_ty env w; arg' <- go_ty env arg; res' <- go_ty env res
; return (ty { ft_mult = w', ft_arg = arg', ft_res = res' }) }
- go_ty !env ty@(TyConApp tc tys)
+ go_ty env ty@(TyConApp tc tys)
= do { tys' <- go_tys env tys; tcapp_ty env ty tc tys' }
- go_ty !env (ForAllTy (Bndr tv vis) inner)
+ go_ty env (ForAllTy (Bndr tv vis) inner)
= do { tycobinder env tv vis $ \env' tv' -> do
; inner' <- go_ty env' inner
; return $ ForAllTy (Bndr tv' vis) inner' }
-- See Note [Use explicit recursion in mapTyCo]
- go_cos !_ [] = return []
- go_cos !env (co:cos) = (:) <$> go_co env co <*> go_cos env cos
+ go_cos _ [] = return []
+ go_cos env (co:cos) = (:) <$> go_co env co <*> go_cos env cos
- go_mco !_ MRefl = return MRefl
- go_mco !env (MCo co) = MCo <$> (go_co env co)
+ go_mco _ MRefl = return MRefl
+ go_mco env (MCo co) = MCo <$> (go_co env co)
go_co :: env -> Coercion -> m Coercion
- go_co !env (Refl ty) = Refl <$> go_ty env ty
- go_co !env (GRefl r ty mco) = mkGReflCo r <$> go_ty env ty <*> go_mco env mco
- go_co !env (AppCo c1 c2) = mkAppCo <$> go_co env c1 <*> go_co env c2
- go_co !env (FunCo r afl afr cw c1 c2) = mkFunCo2 r afl afr <$> go_co env cw
+ go_co env (Refl ty) = Refl <$> go_ty env ty
+ go_co env (GRefl r ty mco) = mkGReflCo r <$> go_ty env ty <*> go_mco env mco
+ go_co env (AppCo c1 c2) = mkAppCo <$> go_co env c1 <*> go_co env c2
+ go_co env (FunCo r afl afr cw c1 c2) = mkFunCo2 r afl afr <$> go_co env cw
<*> go_co env c1 <*> go_co env c2
- go_co !env (CoVarCo cv) = covar env cv
- go_co !env (HoleCo hole) = cohole env hole
- go_co !env (UnivCo { uco_prov = p, uco_role = r
- , uco_lty = t1, uco_rty = t2, uco_deps = deps })
- = mkUnivCo <$> pure p
- <*> go_cos env deps
- <*> pure r
- <*> go_ty env t1 <*> go_ty env t2
- go_co !env (SymCo co) = mkSymCo <$> go_co env co
- go_co !env (TransCo c1 c2) = mkTransCo <$> go_co env c1 <*> go_co env c2
- go_co !env (AxiomCo r cos) = mkAxiomCo r <$> go_cos env cos
- go_co !env (SelCo i co) = SelCo i <$> go_co env co
- go_co !env (LRCo lr co) = mkLRCo lr <$> go_co env co
- go_co !env (InstCo co arg) = mkInstCo <$> go_co env co <*> go_co env arg
- go_co !env (KindCo co) = mkKindCo <$> go_co env co
- go_co !env (SubCo co) = mkSubCo <$> go_co env co
- go_co !env co@(TyConAppCo r tc cos) = do { cos' <- go_cos env cos
+ go_co env (CoVarCo cv) = covar env cv
+ go_co env (HoleCo hole) = cohole env hole
+ go_co env (UnivCo { uco_prov = p, uco_role = r
+ , uco_lty = t1, uco_rty = t2, uco_deps = deps })
+ = mkUnivCo <$> pure p
+ <*> go_cos env deps
+ <*> pure r
+ <*> go_ty env t1 <*> go_ty env t2
+ go_co env (SymCo co) = mkSymCo <$> go_co env co
+ go_co env (TransCo c1 c2) = mkTransCo <$> go_co env c1 <*> go_co env c2
+ go_co env (AxiomCo r cos) = mkAxiomCo r <$> go_cos env cos
+ go_co env (SelCo i co) = mkSelCo i <$> go_co env co
+ go_co env (LRCo lr co) = mkLRCo lr <$> go_co env co
+ go_co env (InstCo co arg) = mkInstCo <$> go_co env co <*> go_co env arg
+ go_co env (KindCo co) = mkKindCo <$> go_co env co
+ go_co env (SubCo co) = mkSubCo <$> go_co env co
+ go_co env co@(TyConAppCo r tc cos) = do { cos' <- go_cos env cos
; tcapp_co env co r tc cos' }
- go_co !env (ForAllCo { fco_tcv = tv, fco_visL = visL, fco_visR = visR
- , fco_kind = kind_co, fco_body = co })
+ go_co env (ForAllCo { fco_tcv = tv, fco_visL = visL, fco_visR = visR
+ , fco_kind = kind_co, fco_body = co })
= do { kind_co' <- go_mco env kind_co
; tycobinder env tv visL $ \env' tv' -> do
; co' <- go_co env' co
=====================================
compiler/GHC/Core/TyCo/Subst.hs
=====================================
@@ -53,7 +53,7 @@ module GHC.Core.TyCo.Subst
import GHC.Prelude
-import {-# SOURCE #-} GHC.Core.Coercion ( mkCoercionType, coVarTypesRole )
+import {-# SOURCE #-} GHC.Core.Coercion ( mkCoercionType, coVarTypesRole, mkTyConAppCo )
import {-# SOURCE #-} GHC.Core.TyCo.Ppr ( pprTyVar )
import {-# SOURCE #-} GHC.Core.Ppr ( ) -- instance Outputable CoreExpr
import {-# SOURCE #-} GHC.Core ( CoreExpr )
@@ -76,8 +76,8 @@ import GHC.Utils.Constants (debugIsOn)
import GHC.Utils.Misc
import GHC.Utils.Outputable
import GHC.Utils.Panic
+import GHC.Utils.StrictIdentity
-import Data.Functor.Identity ( Identity (..) )
import Data.List (mapAccumL)
{-
@@ -769,8 +769,9 @@ substTheta = substTys
substThetaUnchecked :: Subst -> ThetaType -> ThetaType
substThetaUnchecked = substTysUnchecked
-
-substTyCoMapper :: TyCoMapper Subst Identity
+substTyCoMapper :: TyCoMapper Subst StrictIdentity
+-- Use StrictIdentity, so that the entire mapping
+-- operation is strict, building no thunks
substTyCoMapper
= TyCoMapper { tcm_tyvar = subst_tv
, tcm_covar = subst_cv
@@ -787,16 +788,16 @@ substTyCoMapper
tcv_bndr subst tcv _vis k
= k subst' tcv'
where
- (subst', tcv') = substVarBndrUnchecked subst tcv
+ !(subst', tcv') = substVarBndrUnchecked subst tcv
-- Sadly unchecked because subst_ty is used from substTyUnchecked
-- Avoid allocation in this very
-- common case (E.g. Int, LiftedRep etc)
- tcapp_ty :: Subst -> Type -> TyCon -> [Type] -> Identity Type
+ tcapp_ty :: Subst -> Type -> TyCon -> [Type] -> StrictIdentity Type
tcapp_ty _ ty tc tys'
| null tys' = return ty
| otherwise = return (mkTyConApp tc tys')
- tcapp_co :: Subst -> Coercion -> Role -> TyCon -> [Coercion] -> Identity Coercion
+ tcapp_co :: Subst -> Coercion -> Role -> TyCon -> [Coercion] -> StrictIdentity Coercion
tcapp_co _ co r tc cos'
| null cos' = return co
| otherwise = return (mkTyConAppCo r tc cos')
@@ -807,43 +808,8 @@ subst_co :: Subst -> Coercion -> Coercion
= case mapTyCoX substTyCoMapper of
(ms_ty, _, ms_co, _) -> (run ms_ty, run ms_co)
where
- run :: forall a. (Subst -> a -> Identity a) -> Subst -> a -> a
- run ms subst x = runIdentity (ms subst x)
-
-{-
-subst_ty :: Subst -> Type -> Type
--- subst_ty is the main workhorse for type substitution
---
--- Note that the in_scope set is poked only if we hit a forall
--- so it may often never be fully computed
-subst_ty subst ty
- = go ty
- where
- go (TyVarTy tv) = substTyVar subst tv
- go (AppTy fun arg) = (mkAppTy $! (go fun)) $! (go arg)
- -- The mkAppTy smart constructor is important
- -- we might be replacing (a Int), represented with App
- -- by [Int], represented with TyConApp
- go ty@(TyConApp tc []) = tc `seq` ty -- avoid allocation in this common case
- go (TyConApp tc tys) = (mkTyConApp $! tc) $! strictMap go tys
- -- NB: mkTyConApp, not TyConApp.
- -- mkTyConApp has optimizations.
- -- See Note [Using synonyms to compress types]
- -- in GHC.Core.Type
- go ty@(FunTy { ft_mult = mult, ft_arg = arg, ft_res = res })
- = let !mult' = go mult
- !arg' = go arg
- !res' = go res
- in ty { ft_mult = mult', ft_arg = arg', ft_res = res' }
- go (ForAllTy (Bndr tv vis) ty)
- = (ForAllTy $! ((Bndr $! tv') vis)) $! (subst_ty subst' ty)
- where
- !(subst',tv') = substVarBndrUnchecked subst tv
- -- Unchecked because subst_ty is used from substTyUnchecked
- go (LitTy n) = LitTy $! n
- go (CastTy ty co) = (mkCastTy $! (go ty)) $! (subst_co subst co)
- go (CoercionTy co) = CoercionTy $! (subst_co subst co)
--}
+ run :: forall a. (Subst -> a -> StrictIdentity a) -> Subst -> a -> a
+ run ms subst x = runStrictIdentity (ms subst x)
substTyVar :: Subst -> TyVar -> Type
substTyVar (Subst _ _ tenv _) tv
@@ -885,51 +851,6 @@ substCos subst cos
| isEmptyTCvSubst subst = cos
| otherwise = checkValidSubst subst [] cos $ map (subst_co subst) cos
-{-
-subst_co :: HasDebugCallStack => Subst -> Coercion -> Coercion
-subst_co subst co
- = go co
- where
- go_ty :: Type -> Type
- go_ty = subst_ty subst
-
- go_mco :: MCoercion -> MCoercion
- go_mco MRefl = MRefl
- go_mco (MCo co) = MCo (go co)
-
- go :: Coercion -> Coercion
- go (Refl ty) = mkNomReflCo $! (go_ty ty)
- go (GRefl r ty mco) = (mkGReflCo r $! (go_ty ty)) $! (go_mco mco)
- go (TyConAppCo r tc args)= mkTyConAppCo r tc $! go_cos args
- go (AxiomCo con cos) = mkAxiomCo con $! go_cos cos
- go (AppCo co arg) = (mkAppCo $! go co) $! go arg
- go (ForAllCo { fco_tcv = tcv, fco_visL = visL, fco_visR = visR
- , fco_kind = kind_co, fco_body = co })
- = ((mkForAllCo $! tcv') visL visR
- $! go_mco kind_co)
- $! subst_co subst' co
- where
- !(subst', tcv') = substVarBndrUnchecked subst tcv
- -- Unchecked because used from substTyUnchecked
- go (FunCo r afl afr w co1 co2) = ((mkFunCo2 r afl afr $! go w) $! go co1) $! go co2
- go (CoVarCo cv) = substCoVar subst cv
- go (HoleCo h) = substCoHole subst h
- go (UnivCo { uco_prov = p, uco_role = r
- , uco_lty = t1, uco_rty = t2, uco_deps = deps })
- = ((((mkUnivCo $! p) $! go_cos deps) $! r) $!
- (go_ty t1)) $! (go_ty t2)
- go (SymCo co) = mkSymCo $! (go co)
- go (TransCo co1 co2) = (mkTransCo $! (go co1)) $! (go co2)
- go (SelCo d co) = mkSelCo d $! (go co)
- go (LRCo lr co) = mkLRCo lr $! (go co)
- go (InstCo co arg) = (mkInstCo $! (go co)) $! go arg
- go (KindCo co) = mkKindCo $! (go co)
- go (SubCo co) = mkSubCo $! (go co)
-
- go_cos cos = let cos' = map go cos
- in cos' `seqList` cos'
--}
-
-- | Perform a substitution within a 'DVarSet' of free variables,
-- returning the free coercion variables.
substDCoVarSet :: Subst -> DCoVarSet -> DCoVarSet
=====================================
compiler/GHC/Core/Type.hs
=====================================
@@ -256,13 +256,13 @@ import {-# SOURCE #-} GHC.Tc.Utils.TcType ( isConcreteTyVar )
import GHC.Utils.Misc
import GHC.Utils.Outputable
import GHC.Utils.Panic
-import GHC.Data.FastString
+import GHC.Utils.StrictIdentity
+import GHC.Data.FastString
import GHC.Data.Maybe ( orElse, isJust )
import GHC.List (build)
import qualified Data.Monoid as M
-import Data.Functor.Identity
-- $type_classification
-- #type_classification#
@@ -483,9 +483,9 @@ expandTypeSynonyms ty
expandTypeSynonymsX :: Subst -> Type -> Type
expandTypeSynonymsX
= case mapTyCoX expandTypeSynonymMapper of
- (exp_ty, _, _, _) -> \subst ty -> runIdentity (exp_ty subst ty)
+ (exp_ty, _, _, _) -> \subst ty -> runStrictIdentity (exp_ty subst ty)
-expandTypeSynonymMapper :: TyCoMapper Subst Identity
+expandTypeSynonymMapper :: TyCoMapper Subst StrictIdentity
-- Just like substitution, but treat TyConApp specially
expandTypeSynonymMapper
= substTyCoMapper { tcm_tcapp_ty = tcapp_ty }
=====================================
compiler/GHC/Utils/StrictIdentity.hs
=====================================
@@ -0,0 +1,39 @@
+-- |
+-- Module : GHC.Utils.StrictIdentity
+-- License : BSD-style (see the file LICENSE)
+--
+-- The /strict/ identity functor and monad.
+--
+-- This trivial type constructor serves two purposes:
+--
+-- * It can be used with functions parameterized by functor or monad classes.
+--
+-- * It can be used as a base monad to which a series of monad
+-- transformers may be applied to construct a composite monad.
+-- Most monad transformer modules include the special case of
+-- applying the transformer to 'Identity'. For example, @State s@
+-- is an abbreviation for @StateT s 'Identity'@.
+
+-----------------------------------------------------------------------------
+
+module GHC.Utils.StrictIdentity (
+ StrictIdentity(..)
+ ) where
+
+import GHC.Prelude
+
+newtype StrictIdentity a = StrictIdentity { runStrictIdentity :: a }
+
+-----------------------------------------------------------------------------
+-- In the following instances, the key lines are the strict applications ($!)
+-----------------------------------------------------------------------------
+
+instance Functor StrictIdentity where
+ fmap f (StrictIdentity x) = StrictIdentity (f $! x)
+
+instance Applicative StrictIdentity where
+ pure = StrictIdentity
+ (StrictIdentity f) <*> (StrictIdentity x) = StrictIdentity (f $! x)
+
+instance Monad StrictIdentity where
+ m >>= k = k $! (runStrictIdentity m)
=====================================
compiler/ghc.cabal.in
=====================================
@@ -1029,6 +1029,7 @@ Library
GHC.Utils.Panic.Plain
GHC.Utils.Ppr
GHC.Utils.Ppr.Colour
+ GHC.Utils.StrictIdentity
GHC.Utils.TmpFs
GHC.Utils.Touch
GHC.Utils.Trace
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/6b1cf29dcd97a162a5ea3a6fb2fddab…
--
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[Git][ghc/ghc][wip/T27455] base: Don't drop exception context in SomeException(toException)
by sheaf (＠sheaf) 04 Aug '26
by sheaf (＠sheaf) 04 Aug '26
04 Aug '26
sheaf pushed to branch wip/T27455 at Glasgow Haskell Compiler / GHC
Commits:
de52a671 by Ben Gamari at 2026-08-04T15:35:14+02:00
base: Don't drop exception context in SomeException(toException)
For reasons that are lost to time, the implementation of [CLC #200]
that was merged inappropriately dropped `ExceptionContext` in the
`toException` implementation given to `SomeException`.
Fix this infelicity.
[CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200
- - - - -
5 changed files:
- + changelog.d/T27455
- libraries/base/changelog.md
- libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
- testsuite/tests/ghc-e/should_fail/T18441fail7.stderr
- testsuite/tests/ghc-e/should_run/ghc-e005.stderr
Changes:
=====================================
changelog.d/T27455
=====================================
@@ -0,0 +1,8 @@
+section: base
+issues: #27455
+mrs: !16274
+synopsis:
+ Don't drop `ExceptionContext` in `SomeException(toException)`
+description:
+ Previously the implementation of ``Exception(toException)`` given to `SomeException` would inappropriately drop the carried `ExceptionContext`. Now ``toException = id``, faithfully implementing the semantics proposed in :ref:`CLC Proposal #200 <https://github.com/haskell/core-libraries-committee/issues/200>`.
+
=====================================
libraries/base/changelog.md
=====================================
@@ -38,6 +38,7 @@
* Show `ExceptionContext` in `displayExceptionAnnotation` implementation of `WhileHandling` ([GHC #27456](https://gitlab.haskell.org/ghc/ghc/-/issues/27456))
* Hide implementation details when throwing exceptions in throw and throwSTM. ([CLC proposal #387](https://github.com/haskell/core-libraries-committee/issues/387))
* Change `hIsReadable` and `hIsWritable` such that they always throw a respective exception when encountering a closed or semi-closed handle, not just in the case of a file handle. ([CLC proposal #371](github.com/haskell/core-libraries-committee/issues/371))
+ * The implementation of `toException` in `SomeException`'s `Exception` instance no longer drops exception context, in keeping with the behavior originally proposed in [CLC Proposal #200](https://github.com/haskell/core-libraries-committee/issues/200).
* Annotate `onException` continuation with `WhileHandling`. ([CLC Proposal #397](https://github.com/haskell/core-libraries-committee/issues/397))
* Improve error message for `Data.Char.chr`. ([CLC Proposal #384](https://github.com/haskell/core-libraries-committee/issues/384))
=====================================
libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs
=====================================
@@ -55,7 +55,7 @@ import GHC.Internal.Data.Maybe
import GHC.Internal.Data.Typeable (Typeable, TypeRep, cast)
import qualified GHC.Internal.Data.Typeable as Typeable
-- loop: GHC.Internal.Data.Typeable -> GHC.Internal.Err -> GHC.Internal.Exception
-import GHC.Internal.Base (String, Void, fmap, return, ($), (.), (++))
+import GHC.Internal.Base (String, Void, fmap, return, ($), (.), (++), id)
import GHC.Internal.Show
import GHC.Internal.Types (Bool(..))
import GHC.Internal.Exception.Context
@@ -208,7 +208,16 @@ Caught MismatchedParentheses
-}
class (Typeable e, Show e) => Exception e where
- -- | @toException@ should produce a 'SomeException' with no attached 'ExceptionContext'.
+ -- | 'toException' converts an exception into the existential 'SomeException'
+ -- wrapper type.
+ --
+ -- In doing so, 'toException' should not /add/ an 'ExceptionContext'.
+ --
+ -- - In most cases, the exception does not store its own 'ExceptionContext'.
+ -- The default implementation of 'toException' (which does not store any
+ -- 'ExceptionContext') is suitable for these cases.
+ -- - In the rare case that the exception itself stores an 'ExceptionContext',
+ -- this context should be preserved by 'toException'.
toException :: e -> SomeException
fromException :: SomeException -> Maybe e
@@ -231,13 +240,11 @@ class (Typeable e, Show e) => Exception e where
-- | @since base-4.8.0.0
instance Exception Void
--- | This drops any attached 'ExceptionContext'.
+-- | NB: this instance preserves the attached 'ExceptionContext'.
--
-- @since base-3.0
instance Exception SomeException where
- toException (SomeException e) =
- let ?exceptionContext = emptyExceptionContext
- in SomeException e
+ toException = id
fromException = Just
backtraceDesired (SomeException e) = backtraceDesired e
displayException (SomeException e) = displayException e
=====================================
testsuite/tests/ghc-e/should_fail/T18441fail7.stderr
=====================================
@@ -5,8 +5,12 @@ IO error: "Abcde" does not exist
While handling ghc-10.1-inplace:GHC.Utils.Panic.GhcException:
|
| IO error: "Abcde" does not exist
+ |
+ | HasCallStack backtrace:
+ | throw, called at compiler/GHC/Utils/Panic.hs:180:21 in ghc-10.1-inplace:GHC.Utils.Panic
+ | throwGhcException, called at ghc/GHCi/UI.hs:2851:21 in ghc-bin-10.1.20260801-inplace:GHCi.UI
HasCallStack backtrace:
- throwIO, called at compiler\GHC\Utils\Error.hs:499:19 in ghc-10.1-inplace:GHC.Utils.Error
+ throwIO, called at compiler/GHC/Utils/Error.hs:513:19 in ghc-10.1-inplace:GHC.Utils.Error
1
=====================================
testsuite/tests/ghc-e/should_run/ghc-e005.stderr
=====================================
@@ -4,3 +4,8 @@ foo
HasCallStack backtrace:
error, called at ghc-e005.hs:12:10 in main:Main
+
+
+HasCallStack backtrace:
+ throwIO, called at ghc\GHCi\UI.hs:1655:31 in ghc-bin-10.1.20260629-inplace:GHCi.UI
+
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/de52a671a1893ce445fa2d8aacfedb0…
--
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04 Aug '26
Vladislav Zavialov pushed new branch wip/int-index/t18725 at Glasgow Haskell Compiler / GHC
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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 7 commits: ci: add caching steps for ghc build results
by Marge Bot (＠marge-bot) 04 Aug '26
by Marge Bot (＠marge-bot) 04 Aug '26
04 Aug '26
Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC
Commits:
a3a9e8dd by mangoiv at 2026-08-04T08:41:10-04:00
ci: add caching steps for ghc build results
cache the ghc build directory keyed by the commit sha, such that it can
be restored in case of a spurious failure occuring when running the
testsuite. Previously this would result in running another GHC build.
Not running the GHC build saves about 1 hour CI time per run.
Resolves #26739
- - - - -
b20cee06 by Simon Jakobi at 2026-08-04T08:41:11-04:00
testsuite: Don't crash on non-UTF-8 test output
read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded
strictly (the first three with UTF-8, read_diff with the locale
encoding), so a test emitting invalid UTF-8 (binary output, or a crash
truncating a multi-byte character) raised UnicodeDecodeError and was
reported as a framework failure instead of its actual result.
Decode with errors='replace', like read_no_crs and safe_print.
Assisted-by: Claude Fable 5
- - - - -
2bd7fb5f by Simon Jakobi at 2026-08-04T08:41:11-04:00
testsuite: Colorize the test summary, also in CI
The summary headings were plain, and SUMMARY was colored unconditionally,
so the escapes also ended up in the file written by --summary-file.
Color is now decided per output sink via term_color.colored_if; see the
comments in term_color.
CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so
add --force-colors and pass it in .gitlab/ci.sh.
Assisted-by: Claude Opus 5
- - - - -
cf9d30ce by Simon Jakobi at 2026-08-04T08:41:12-04:00
testsuite: Repeat unexpected failure output in the summary
Finding out why a test failed meant scrolling back through a possibly
very long log to the point where the test ran. The summary now repeats
the captured output of unexpected failures, before the statistics, so
the most interesting part is at the end of the log (#16720).
Output mismatches report their diff instead of the mismatching stream
(see Note [Redundant output in test results]). The repeated output is
bounded per stream, and skipped altogether beyond
MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in
several ways share one block.
Test results now report a source-relative directory, stable regardless
of where the run was started from.
Assisted-by: Claude Fable 5
- - - - -
0693290e by Vladislav Zavialov at 2026-08-04T08:41:12-04:00
Discard type arguments in tcPatToExpr (#27440, #27583)
The builder expression of an implicitly bidirectional pattern synonym must not
mention types written in the RHS:
* Invisible type arguments led to a panic (#27440)
* Required type arguments failed with out-of-scope variables (#27583)
Both are now discarded, following the precedent established by pattern
signatures (#9867).
Discarding type arguments takes some care: a type pattern cannot be told from a
value pattern by syntax alone, as the `type` keyword may be omitted. Consider:
data T a b c where
MkT :: forall a. forall b c -> a -> T a b c
pattern P :: x -> T x y z
pattern P x = MkT @a (type b) c x
In P's right-hand side, `@a` and `type b` are clearly type arguments, but what
about `c` and `x`? We can only tell by matching the patterns against MkT's
type. So tcPatToExpr now runs in TcM and matches the arguments against the
constructor's TyVarBinders using zipPatsBndrs, which is made public for this
purpose. The resulting builder is $bP x = MkT _ _ x.
See Note [Discarding types in the builder expression].
Test cases: T27440a T27440b T27440c T27440d T27440e
T27583a T27583b T27583c T27583d T27583e T27583f T27583g
Assisted-by: Claude Opus 5
- - - - -
df867367 by Vladislav Zavialov at 2026-08-04T08:41:13-04:00
Test case for #20902
Starting with GHC 9.14.1 (the first major release to include 51e3ec83),
and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68
and b30f25591e), all examples in this ticket are handled as expected.
- - - - -
e3365137 by Alan Zimmerman at 2026-08-04T08:41:14-04:00
EPA: Remove LocatedP, last use in WarningTxt
The last step of removing LocatedP, by moving the AnnPragma for
WarningTxt into its TTG extension point instead.
This also allows us to remove LocatedP and SrcSpanAnnP
- - - - -
42 changed files:
- .gitlab/ci.sh
- .gitlab/generate-ci/flake.lock
- .gitlab/generate-ci/flake.nix
- .gitlab/generate-ci/gen_ci.hs
- .gitlab/jobs.yaml
- + changelog.d/T27440
- + changelog.d/T27583
- compiler/GHC/Builtin/Utils.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Dump.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Warnings.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Tc/Gen/Pat.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Unit/Module/Warnings.hs
- testsuite/driver/runtests.py
- testsuite/driver/term_color.py
- testsuite/driver/testlib.py
- + testsuite/tests/patsyn/should_compile/T27440a.hs
- + testsuite/tests/patsyn/should_compile/T27440b.hs
- + testsuite/tests/patsyn/should_compile/T27440c.hs
- testsuite/tests/patsyn/should_compile/all.T
- + testsuite/tests/patsyn/should_fail/T27440d.hs
- + testsuite/tests/patsyn/should_fail/T27440d.stderr
- testsuite/tests/patsyn/should_fail/all.T
- + testsuite/tests/th/T20902.hs
- testsuite/tests/th/all.T
- + testsuite/tests/vdq-rta/should_compile/T27583a.hs
- + testsuite/tests/vdq-rta/should_compile/T27583b.hs
- + testsuite/tests/vdq-rta/should_compile/T27583c.hs
- + testsuite/tests/vdq-rta/should_compile/T27583d.hs
- + testsuite/tests/vdq-rta/should_compile/T27583e.hs
- + testsuite/tests/vdq-rta/should_compile/T27583g.hs
- testsuite/tests/vdq-rta/should_compile/all.T
- + testsuite/tests/vdq-rta/should_fail/T27440e.hs
- + testsuite/tests/vdq-rta/should_fail/T27440e.stderr
- + testsuite/tests/vdq-rta/should_fail/T27583f.hs
- + testsuite/tests/vdq-rta/should_fail/T27583f.stderr
- testsuite/tests/vdq-rta/should_fail/all.T
- utils/check-exact/ExactPrint.hs
The diff was not included because it is too large.
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04 Aug '26
Simon Peyton Jones pushed to branch wip/T27591 at Glasgow Haskell Compiler / GHC
Commits:
f9bdc8e7 by Simon Peyton Jones at 2026-08-04T13:34:57+01:00
Documentation only
...driven by my investigation of #27591
- - - - -
3 changed files:
- compiler/GHC/Core/Class.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Types/Id/Make.hs
Changes:
=====================================
compiler/GHC/Core/Class.hs
=====================================
@@ -84,9 +84,9 @@ data Class
-- Here fun-deps are [([a,b],[c]), ([a,c],[b])]
type FunDep a = ([a],[a])
-type ClassOpItem = (Id, DefMethInfo)
- -- Selector function; contains unfolding
- -- Default-method info
+type ClassOpItem = ( Id -- Dictionary selector function
+ -- See Note [Dictionary selectors]
+ , DefMethInfo) -- Default-method info
type DefMethInfo = Maybe (Name, DefMethSpec Type)
-- Nothing No default method
@@ -164,7 +164,19 @@ classMinimalDef :: Class -> ClassMinimalDef
classMinimalDef Class{ classBody = ConcreteClass{ cls_min_def = d } } = d
classMinimalDef _ = mkTrue -- TODO: make sure this is the right direction
-{-
+{- Note [Dictionary selectors]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Each `ClassOpItem` stores a dictionary selector `Id`:
+
+* The type of the selector is always closed, and has form
+ forall a1..an. C a1 .. an => blah
+ where `a1..an` are the class variables, and
+ `blah` is the method type.
+ See GHC.Types.Id.Make.mkDictSelId, which constructs them.
+
+* The selector has no unfolding, but one RULE.
+ See Note [ClassOp/DFun selection] in GHC.Tc.TyCl.Instance
+
Note [Associated type defaults]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The following is an example of associated type defaults:
=====================================
compiler/GHC/Rename/HsType.hs
=====================================
@@ -1188,10 +1188,20 @@ bindHsOuterTyVarBndrs :: OutputableBndrFlag flag 'Renamed
-> RnM (a, FreeNames)
bindHsOuterTyVarBndrs doc mb_cls implicit_vars outer_bndrs thing_inside =
case outer_bndrs of
+
HsOuterImplicit{} ->
+ -- Add an implicit `forall a1..an` at the top, where `a1..an`
+ -- are not-otherwise-in-scope type variables.
+ -- Used when there is no forall, or a /visible/ (forall a -> blah)
+ -- See Note [forall-or-nothing rule] in Language.Haskell.Syntax.Type
rnImplicitTvOccs mb_cls implicit_vars $ \implicit_vars' ->
thing_inside $ HsOuterImplicit { hso_ximplicit = implicit_vars' }
+
HsOuterExplicit{hso_bndrs = exp_bndrs} ->
+ -- The type already has an explicit, user-written, invisible forall,
+ -- so do not add an implicit forall
+ -- See Note [forall-or-nothing rule] in Language.Haskell.Syntax.Type
+ --
-- Note: If we pass mb_cls instead of Nothing below, bindLHsTyVarBndrs
-- will use class variables for any names the user meant to bring in
-- scope here. This is an explicit forall, so we want fresh names, not
=====================================
compiler/GHC/Types/Id/Make.hs
=====================================
@@ -480,7 +480,7 @@ Therefore there is no loss of generality if we make all selectors unrestricted.
mkDictSelId :: Name -- Name of one of the *value* selectors
-- (dictionary superclass or method)
-> Class -> Id
--- Important: see Note [ClassOp/DFun selection] in GHC.Tc.TyCl.Instance
+-- See Note [Dictionary selectors]
mkDictSelId name clas
= mkGlobalId (ClassOpId clas terminating) name sel_ty info
where
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[Git][ghc/ghc][wip/spj-reinstallable-base2] Allow GHC.Essentials to be hidden
by sheaf (＠sheaf) 04 Aug '26
by sheaf (＠sheaf) 04 Aug '26
04 Aug '26
sheaf pushed to branch wip/spj-reinstallable-base2 at Glasgow Haskell Compiler / GHC
Commits:
b43e6a1d by sheaf at 2026-08-04T14:34:52+02:00
Allow GHC.Essentials to be hidden
- - - - -
34 changed files:
- compiler/GHC/Builtin.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/Iface/Errors/Ppr.hs
- compiler/GHC/Iface/Errors/Types.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Unit/External.hs
- compiler/GHC/Unit/External/ModuleOrigin.hs
- compiler/GHC/Unit/External/Providers.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/State.hs
- libraries/base/base.cabal.in
- testsuite/tests/cabal/T12485/Makefile
- testsuite/tests/driver/T27013e/T27013e.stderr
- testsuite/tests/driver/T27013f/T27013f.stderr
- testsuite/tests/driver/multipleHomeUnits/Makefile
- testsuite/tests/driver/multipleHomeUnits/all.T
- + testsuite/tests/driver/multipleHomeUnits/essentials-home/GHC/Essentials.hs
- + testsuite/tests/driver/multipleHomeUnits/essentials-user/M.hs
- testsuite/tests/driver/multipleHomeUnits/multipleHomeUnitsModuleVisibility.stderr
- + testsuite/tests/driver/multipleHomeUnits/multipleHomeUnits_essentials.stdout
- + testsuite/tests/driver/multipleHomeUnits/unitEssentialsHome
- + testsuite/tests/driver/multipleHomeUnits/unitEssentialsUser
- testsuite/tests/ghci/scripts/all.T
- testsuite/tests/interface-stability/base-exports.stdout
- testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs
- testsuite/tests/interface-stability/base-exports.stdout-mingw32
The diff was not included because it is too large.
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[Git][ghc/ghc][wip/jeltsch/textual-bytecode-output] Change the `emsdk` test output name suffix to `ghcjs`
by Wolfgang Jeltsch (＠jeltsch) 04 Aug '26
by Wolfgang Jeltsch (＠jeltsch) 04 Aug '26
04 Aug '26
Wolfgang Jeltsch pushed to branch wip/jeltsch/textual-bytecode-output at Glasgow Haskell Compiler / GHC
Commits:
2471d88d by Wolfgang Jeltsch at 2026-08-04T15:04:36+03:00
Change the `emsdk` test output name suffix to `ghcjs`
- - - - -
3 changed files:
- testsuite/tests/show-bytecode/show-bytecode-breakpoints.stdout-ws → testsuite/tests/show-bytecode/show-bytecode-breakpoints.stdout-ghcjs
- testsuite/tests/show-bytecode/show-bytecode-hpc.stdout-ws → testsuite/tests/show-bytecode/show-bytecode-hpc.stdout-ghcjs
- testsuite/tests/show-bytecode/show-bytecode-vanilla.stdout-ws → testsuite/tests/show-bytecode/show-bytecode-vanilla.stdout-ghcjs
Changes:
=====================================
testsuite/tests/show-bytecode/show-bytecode-breakpoints.stdout-ws → testsuite/tests/show-bytecode/show-bytecode-breakpoints.stdout-ghcjs
=====================================
=====================================
testsuite/tests/show-bytecode/show-bytecode-hpc.stdout-ws → testsuite/tests/show-bytecode/show-bytecode-hpc.stdout-ghcjs
=====================================
=====================================
testsuite/tests/show-bytecode/show-bytecode-vanilla.stdout-ws → testsuite/tests/show-bytecode/show-bytecode-vanilla.stdout-ghcjs
=====================================
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Simon Peyton Jones pushed new branch wip/T27591 at Glasgow Haskell Compiler / GHC
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[Git][ghc/ghc][wip/substitution-via-mapper] Make substitution strict
by Simon Peyton Jones (＠simonpj) 04 Aug '26
by Simon Peyton Jones (＠simonpj) 04 Aug '26
04 Aug '26
Simon Peyton Jones pushed to branch wip/substitution-via-mapper at Glasgow Haskell Compiler / GHC
Commits:
9890c886 by Simon Peyton Jones at 2026-08-04T11:52:22+01:00
Make substitution strict
It's nice that it is so easy to do so
- - - - -
5 changed files:
- compiler/GHC/Core/TyCo/Make.hs
- compiler/GHC/Core/TyCo/Subst.hs
- compiler/GHC/Core/Type.hs
- + compiler/GHC/Utils/StrictIdentity.hs
- compiler/ghc.cabal.in
Changes:
=====================================
compiler/GHC/Core/TyCo/Make.hs
=====================================
@@ -48,14 +48,12 @@ module GHC.Core.TyCo.Make (
-- Coercions
, mkReflCo, mkNomReflCo, mkRepReflCo
, mkCoVarCo, mkCoVarCos, mkHoleCo
- , mkKindCo, mkSelCo
+ , mkKindCo
, mkGReflCo, mkGReflRightCo, mkGReflLeftCo
, mkGReflMCo, mkGReflRightMCo, mkGReflLeftMCo
, mkSubCo, mkSymCo, mkSymMCo
, mkFunCo2, mkForAllCo, mkUnivCo
, mkAxiomCo, mkUnbranchedAxInstCo
- , mkAppCo, mkTyConAppCo
- , mkInstCo, mkLRCo
, mkFunCo, mkNakedFunCo
, mkNakedForAllCo, mkForAllVisCos, mkHomoForAllCo, mkHomoForAllCos
, mkAxInstCo
@@ -83,7 +81,7 @@ module GHC.Core.TyCo.Make (
import GHC.Prelude
import {-# SOURCE #-} GHC.Core.Coercion
- ( mkLRCo, mkInstCo, mkAppCo, mkAppCos, mkTyConAppCo, mkSelCo
+ ( mkLRCo, mkInstCo, mkAppCo, mkAppCos, mkSelCo
, decomposePiCos
, isKindCo
, coercionKind -- Used in toPhantomCo
@@ -222,60 +220,60 @@ mapTyCoX (TyCoMapper { tcm_tyvar = tyvar
= (go_ty, go_tys, go_co, go_cos)
where
-- See Note [Use explicit recursion in mapTyCo]
- go_tys !_ [] = return []
- go_tys !env (ty:tys) = (:) <$> go_ty env ty <*> go_tys env tys
+ go_tys _ [] = return []
+ go_tys env (ty:tys) = (:) <$> go_ty env ty <*> go_tys env tys
- go_ty !env (TyVarTy tv) = tyvar env tv
- go_ty !env (AppTy t1 t2) = mkAppTy <$> go_ty env t1 <*> go_ty env t2
- go_ty !_ ty@(LitTy {}) = return ty
- go_ty !env (CastTy ty co) = mkCastTy <$> go_ty env ty <*> go_co env co
- go_ty !env (CoercionTy co) = CoercionTy <$> go_co env co
+ go_ty env (TyVarTy tv) = tyvar env tv
+ go_ty env (AppTy t1 t2) = mkAppTy <$> go_ty env t1 <*> go_ty env t2
+ go_ty _ ty@(LitTy {}) = return ty
+ go_ty env (CastTy ty co) = mkCastTy <$> go_ty env ty <*> go_co env co
+ go_ty env (CoercionTy co) = CoercionTy <$> go_co env co
- go_ty !env ty@(FunTy _ w arg res)
+ go_ty env ty@(FunTy _ w arg res)
= do { w' <- go_ty env w; arg' <- go_ty env arg; res' <- go_ty env res
; return (ty { ft_mult = w', ft_arg = arg', ft_res = res' }) }
- go_ty !env ty@(TyConApp tc tys)
+ go_ty env ty@(TyConApp tc tys)
= do { tys' <- go_tys env tys; tcapp_ty env ty tc tys' }
- go_ty !env (ForAllTy (Bndr tv vis) inner)
+ go_ty env (ForAllTy (Bndr tv vis) inner)
= do { tycobinder env tv vis $ \env' tv' -> do
; inner' <- go_ty env' inner
; return $ ForAllTy (Bndr tv' vis) inner' }
-- See Note [Use explicit recursion in mapTyCo]
- go_cos !_ [] = return []
- go_cos !env (co:cos) = (:) <$> go_co env co <*> go_cos env cos
+ go_cos _ [] = return []
+ go_cos env (co:cos) = (:) <$> go_co env co <*> go_cos env cos
- go_mco !_ MRefl = return MRefl
- go_mco !env (MCo co) = MCo <$> (go_co env co)
+ go_mco _ MRefl = return MRefl
+ go_mco env (MCo co) = MCo <$> (go_co env co)
go_co :: env -> Coercion -> m Coercion
- go_co !env (Refl ty) = Refl <$> go_ty env ty
- go_co !env (GRefl r ty mco) = mkGReflCo r <$> go_ty env ty <*> go_mco env mco
- go_co !env (AppCo c1 c2) = mkAppCo <$> go_co env c1 <*> go_co env c2
- go_co !env (FunCo r afl afr cw c1 c2) = mkFunCo2 r afl afr <$> go_co env cw
+ go_co env (Refl ty) = Refl <$> go_ty env ty
+ go_co env (GRefl r ty mco) = mkGReflCo r <$> go_ty env ty <*> go_mco env mco
+ go_co env (AppCo c1 c2) = mkAppCo <$> go_co env c1 <*> go_co env c2
+ go_co env (FunCo r afl afr cw c1 c2) = mkFunCo2 r afl afr <$> go_co env cw
<*> go_co env c1 <*> go_co env c2
- go_co !env (CoVarCo cv) = covar env cv
- go_co !env (HoleCo hole) = cohole env hole
- go_co !env (UnivCo { uco_prov = p, uco_role = r
- , uco_lty = t1, uco_rty = t2, uco_deps = deps })
- = mkUnivCo <$> pure p
- <*> go_cos env deps
- <*> pure r
- <*> go_ty env t1 <*> go_ty env t2
- go_co !env (SymCo co) = mkSymCo <$> go_co env co
- go_co !env (TransCo c1 c2) = mkTransCo <$> go_co env c1 <*> go_co env c2
- go_co !env (AxiomCo r cos) = mkAxiomCo r <$> go_cos env cos
- go_co !env (SelCo i co) = SelCo i <$> go_co env co
- go_co !env (LRCo lr co) = mkLRCo lr <$> go_co env co
- go_co !env (InstCo co arg) = mkInstCo <$> go_co env co <*> go_co env arg
- go_co !env (KindCo co) = mkKindCo <$> go_co env co
- go_co !env (SubCo co) = mkSubCo <$> go_co env co
- go_co !env co@(TyConAppCo r tc cos) = do { cos' <- go_cos env cos
+ go_co env (CoVarCo cv) = covar env cv
+ go_co env (HoleCo hole) = cohole env hole
+ go_co env (UnivCo { uco_prov = p, uco_role = r
+ , uco_lty = t1, uco_rty = t2, uco_deps = deps })
+ = mkUnivCo <$> pure p
+ <*> go_cos env deps
+ <*> pure r
+ <*> go_ty env t1 <*> go_ty env t2
+ go_co env (SymCo co) = mkSymCo <$> go_co env co
+ go_co env (TransCo c1 c2) = mkTransCo <$> go_co env c1 <*> go_co env c2
+ go_co env (AxiomCo r cos) = mkAxiomCo r <$> go_cos env cos
+ go_co env (SelCo i co) = mkSelCo i <$> go_co env co
+ go_co env (LRCo lr co) = mkLRCo lr <$> go_co env co
+ go_co env (InstCo co arg) = mkInstCo <$> go_co env co <*> go_co env arg
+ go_co env (KindCo co) = mkKindCo <$> go_co env co
+ go_co env (SubCo co) = mkSubCo <$> go_co env co
+ go_co env co@(TyConAppCo r tc cos) = do { cos' <- go_cos env cos
; tcapp_co env co r tc cos' }
- go_co !env (ForAllCo { fco_tcv = tv, fco_visL = visL, fco_visR = visR
- , fco_kind = kind_co, fco_body = co })
+ go_co env (ForAllCo { fco_tcv = tv, fco_visL = visL, fco_visR = visR
+ , fco_kind = kind_co, fco_body = co })
= do { kind_co' <- go_mco env kind_co
; tycobinder env tv visL $ \env' tv' -> do
; co' <- go_co env' co
=====================================
compiler/GHC/Core/TyCo/Subst.hs
=====================================
@@ -53,7 +53,7 @@ module GHC.Core.TyCo.Subst
import GHC.Prelude
-import {-# SOURCE #-} GHC.Core.Coercion ( mkCoercionType, coVarTypesRole )
+import {-# SOURCE #-} GHC.Core.Coercion ( mkCoercionType, coVarTypesRole, mkTyConAppCo )
import {-# SOURCE #-} GHC.Core.TyCo.Ppr ( pprTyVar )
import {-# SOURCE #-} GHC.Core.Ppr ( ) -- instance Outputable CoreExpr
import {-# SOURCE #-} GHC.Core ( CoreExpr )
@@ -76,8 +76,8 @@ import GHC.Utils.Constants (debugIsOn)
import GHC.Utils.Misc
import GHC.Utils.Outputable
import GHC.Utils.Panic
+import GHC.Utils.StrictIdentity
-import Data.Functor.Identity ( Identity (..) )
import Data.List (mapAccumL)
{-
@@ -769,8 +769,9 @@ substTheta = substTys
substThetaUnchecked :: Subst -> ThetaType -> ThetaType
substThetaUnchecked = substTysUnchecked
-
-substTyCoMapper :: TyCoMapper Subst Identity
+substTyCoMapper :: TyCoMapper Subst StrictIdentity
+-- Use StrictIdentity, so that the entire mapping
+-- operation is strict, building no thunks
substTyCoMapper
= TyCoMapper { tcm_tyvar = subst_tv
, tcm_covar = subst_cv
@@ -787,16 +788,16 @@ substTyCoMapper
tcv_bndr subst tcv _vis k
= k subst' tcv'
where
- (subst', tcv') = substVarBndrUnchecked subst tcv
+ !(subst', tcv') = substVarBndrUnchecked subst tcv
-- Sadly unchecked because subst_ty is used from substTyUnchecked
-- Avoid allocation in this very
-- common case (E.g. Int, LiftedRep etc)
- tcapp_ty :: Subst -> Type -> TyCon -> [Type] -> Identity Type
+ tcapp_ty :: Subst -> Type -> TyCon -> [Type] -> StrictIdentity Type
tcapp_ty _ ty tc tys'
| null tys' = return ty
| otherwise = return (mkTyConApp tc tys')
- tcapp_co :: Subst -> Coercion -> Role -> TyCon -> [Coercion] -> Identity Coercion
+ tcapp_co :: Subst -> Coercion -> Role -> TyCon -> [Coercion] -> StrictIdentity Coercion
tcapp_co _ co r tc cos'
| null cos' = return co
| otherwise = return (mkTyConAppCo r tc cos')
@@ -807,43 +808,8 @@ subst_co :: Subst -> Coercion -> Coercion
= case mapTyCoX substTyCoMapper of
(ms_ty, _, ms_co, _) -> (run ms_ty, run ms_co)
where
- run :: forall a. (Subst -> a -> Identity a) -> Subst -> a -> a
- run ms subst x = runIdentity (ms subst x)
-
-{-
-subst_ty :: Subst -> Type -> Type
--- subst_ty is the main workhorse for type substitution
---
--- Note that the in_scope set is poked only if we hit a forall
--- so it may often never be fully computed
-subst_ty subst ty
- = go ty
- where
- go (TyVarTy tv) = substTyVar subst tv
- go (AppTy fun arg) = (mkAppTy $! (go fun)) $! (go arg)
- -- The mkAppTy smart constructor is important
- -- we might be replacing (a Int), represented with App
- -- by [Int], represented with TyConApp
- go ty@(TyConApp tc []) = tc `seq` ty -- avoid allocation in this common case
- go (TyConApp tc tys) = (mkTyConApp $! tc) $! strictMap go tys
- -- NB: mkTyConApp, not TyConApp.
- -- mkTyConApp has optimizations.
- -- See Note [Using synonyms to compress types]
- -- in GHC.Core.Type
- go ty@(FunTy { ft_mult = mult, ft_arg = arg, ft_res = res })
- = let !mult' = go mult
- !arg' = go arg
- !res' = go res
- in ty { ft_mult = mult', ft_arg = arg', ft_res = res' }
- go (ForAllTy (Bndr tv vis) ty)
- = (ForAllTy $! ((Bndr $! tv') vis)) $! (subst_ty subst' ty)
- where
- !(subst',tv') = substVarBndrUnchecked subst tv
- -- Unchecked because subst_ty is used from substTyUnchecked
- go (LitTy n) = LitTy $! n
- go (CastTy ty co) = (mkCastTy $! (go ty)) $! (subst_co subst co)
- go (CoercionTy co) = CoercionTy $! (subst_co subst co)
--}
+ run :: forall a. (Subst -> a -> StrictIdentity a) -> Subst -> a -> a
+ run ms subst x = runStrictIdentity (ms subst x)
substTyVar :: Subst -> TyVar -> Type
substTyVar (Subst _ _ tenv _) tv
@@ -885,51 +851,6 @@ substCos subst cos
| isEmptyTCvSubst subst = cos
| otherwise = checkValidSubst subst [] cos $ map (subst_co subst) cos
-{-
-subst_co :: HasDebugCallStack => Subst -> Coercion -> Coercion
-subst_co subst co
- = go co
- where
- go_ty :: Type -> Type
- go_ty = subst_ty subst
-
- go_mco :: MCoercion -> MCoercion
- go_mco MRefl = MRefl
- go_mco (MCo co) = MCo (go co)
-
- go :: Coercion -> Coercion
- go (Refl ty) = mkNomReflCo $! (go_ty ty)
- go (GRefl r ty mco) = (mkGReflCo r $! (go_ty ty)) $! (go_mco mco)
- go (TyConAppCo r tc args)= mkTyConAppCo r tc $! go_cos args
- go (AxiomCo con cos) = mkAxiomCo con $! go_cos cos
- go (AppCo co arg) = (mkAppCo $! go co) $! go arg
- go (ForAllCo { fco_tcv = tcv, fco_visL = visL, fco_visR = visR
- , fco_kind = kind_co, fco_body = co })
- = ((mkForAllCo $! tcv') visL visR
- $! go_mco kind_co)
- $! subst_co subst' co
- where
- !(subst', tcv') = substVarBndrUnchecked subst tcv
- -- Unchecked because used from substTyUnchecked
- go (FunCo r afl afr w co1 co2) = ((mkFunCo2 r afl afr $! go w) $! go co1) $! go co2
- go (CoVarCo cv) = substCoVar subst cv
- go (HoleCo h) = substCoHole subst h
- go (UnivCo { uco_prov = p, uco_role = r
- , uco_lty = t1, uco_rty = t2, uco_deps = deps })
- = ((((mkUnivCo $! p) $! go_cos deps) $! r) $!
- (go_ty t1)) $! (go_ty t2)
- go (SymCo co) = mkSymCo $! (go co)
- go (TransCo co1 co2) = (mkTransCo $! (go co1)) $! (go co2)
- go (SelCo d co) = mkSelCo d $! (go co)
- go (LRCo lr co) = mkLRCo lr $! (go co)
- go (InstCo co arg) = (mkInstCo $! (go co)) $! go arg
- go (KindCo co) = mkKindCo $! (go co)
- go (SubCo co) = mkSubCo $! (go co)
-
- go_cos cos = let cos' = map go cos
- in cos' `seqList` cos'
--}
-
-- | Perform a substitution within a 'DVarSet' of free variables,
-- returning the free coercion variables.
substDCoVarSet :: Subst -> DCoVarSet -> DCoVarSet
=====================================
compiler/GHC/Core/Type.hs
=====================================
@@ -256,13 +256,13 @@ import {-# SOURCE #-} GHC.Tc.Utils.TcType ( isConcreteTyVar )
import GHC.Utils.Misc
import GHC.Utils.Outputable
import GHC.Utils.Panic
-import GHC.Data.FastString
+import GHC.Utils.StrictIdentity
+import GHC.Data.FastString
import GHC.Data.Maybe ( orElse, isJust )
import GHC.List (build)
import qualified Data.Monoid as M
-import Data.Functor.Identity
-- $type_classification
-- #type_classification#
@@ -483,9 +483,9 @@ expandTypeSynonyms ty
expandTypeSynonymsX :: Subst -> Type -> Type
expandTypeSynonymsX
= case mapTyCoX expandTypeSynonymMapper of
- (exp_ty, _, _, _) -> \subst ty -> runIdentity (exp_ty subst ty)
+ (exp_ty, _, _, _) -> \subst ty -> runStrictIdentity (exp_ty subst ty)
-expandTypeSynonymMapper :: TyCoMapper Subst Identity
+expandTypeSynonymMapper :: TyCoMapper Subst StrictIdentity
-- Just like substitution, but treat TyConApp specially
expandTypeSynonymMapper
= substTyCoMapper { tcm_tcapp_ty = tcapp_ty }
=====================================
compiler/GHC/Utils/StrictIdentity.hs
=====================================
@@ -0,0 +1,41 @@
+-- |
+-- Module : GHC.Utils.StrictIdentity
+-- License : BSD-style (see the file LICENSE)
+--
+-- The /strict/ identity functor and monad.
+--
+-- This trivial type constructor serves two purposes:
+--
+-- * It can be used with functions parameterized by functor or monad classes.
+--
+-- * It can be used as a base monad to which a series of monad
+-- transformers may be applied to construct a composite monad.
+-- Most monad transformer modules include the special case of
+-- applying the transformer to 'Identity'. For example, @State s@
+-- is an abbreviation for @StateT s 'Identity'@.
+
+-----------------------------------------------------------------------------
+
+module GHC.Utils.StrictIdentity (
+ StrictIdentity(..)
+ ) where
+
+import GHC.Prelude
+
+import Data.Coerce( coerce )
+
+newtype StrictIdentity a = StrictIdentity { runStrictIdentity :: a }
+
+-----------------------------------------------------------------------------
+-- In the following instances, the key lines are the strict applications ($!)
+-----------------------------------------------------------------------------
+
+instance Functor StrictIdentity where
+ fmap f (StrictIdentity x) = StrictIdentity (f $! x)
+
+instance Applicative StrictIdentity where
+ pure = StrictIdentity
+ (StrictIdentity f) <*> (StrictIdentity x) = StrictIdentity (f $! x)
+
+instance Monad StrictIdentity where
+ m >>= k = k $! (runStrictIdentity m)
=====================================
compiler/ghc.cabal.in
=====================================
@@ -1029,6 +1029,7 @@ Library
GHC.Utils.Panic.Plain
GHC.Utils.Ppr
GHC.Utils.Ppr.Colour
+ GHC.Utils.StrictIdentity
GHC.Utils.TmpFs
GHC.Utils.Touch
GHC.Utils.Trace
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/9890c886344f28b32af722675efb64a…
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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/9890c886344f28b32af722675efb64a…
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[Git][ghc/ghc][wip/spj-reinstallable-base2] 84 commits: ci: add missing docker permission workaround in abi-test job
by sheaf (＠sheaf) 04 Aug '26
by sheaf (＠sheaf) 04 Aug '26
04 Aug '26
sheaf pushed to branch wip/spj-reinstallable-base2 at Glasgow Haskell Compiler / GHC
Commits:
0f64f348 by Cheng Shao at 2026-07-16T15:41:08+00:00
ci: add missing docker permission workaround in abi-test job
- - - - -
660cb239 by Cheng Shao at 2026-07-16T19:37:48+00:00
bindist: Fix make install -j race condition on macos/freebsd
This patch fixes make install -j race condition on macos/freebsd. BSD
install fails with EEXIST when multiple install processes concurrently
create the same prefix directory. So we add an `install_dirs`
prerequisite job that sequentially creates the directories for
subsequent jobs to work with. Fixes #27499.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
08130257 by Cheng Shao at 2026-07-16T19:37:48+00:00
ci: run bindist make install with -j
This patch makes the ci scripts run `make install` with `-j` to reduce
wall clock time when installing the bindist, see related issue for
benchmark numbers. This only affects ghc ci logic, the user-facing
default is up to distributors and is still `-j1`. Closes #27029.
- - - - -
d5ae6906 by Adam Gundry at 2026-07-17T04:57:43-04:00
Mark various language extension flags as deprecated (see #27329)
The following language extensions are now deprecated:
- AlternativeLayoutRule
- AlternativeLayoutRuleTransitional
- ParallelArrays
- PolymorphicComponents
- Rank2Types
In addition, the warning `-Walternative-layout-rule-transitional`
has been marked as deprecated, as it is emitted only under the
deprecated extension `XAlternativeLayoutRuleTransitional`.
- - - - -
fe3b059c by Andrew Lelechenko at 2026-07-17T04:58:26-04:00
base: re-export GHC.Environment.getFullArgs from System.Environment
CLC proposal https://github.com/haskell/core-libraries-committee/issues/431
- - - - -
722236dd by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid double-Sym for InstCo
Ticket #27374 pointed out an issue with GHC.Core.Coercion.Opt.optCoercion's
handling of InstCo: it contravened (LC2) in Note [The LiftingContext in optCoercion]
because it applied the ambient 'sym' to a coercion that was then added
to the lifting context substitution.
Fixes #27374
Co-authored-by: Simon Jakobi <simon.jakobi(a)gmail.com>
- - - - -
ff70fc75 by sheaf at 2026-07-18T08:48:31-04:00
Coercion optimisation: avoid exponential behaviour
The change to coercion optimisation of 'InstCo' in the previous commit
introduces exponential behaviour to the coercion optimiser. To avoid
this, this commit provides a way to push in 'Sym' of an already-optimised
coercion: GHC.Core.Coercion.Opt.mkDeepSymCo.
See Note [Pushing Sym without re-optimising] in GHC.Core.Coercion.Opt.
- - - - -
dfef27f0 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Move THREADED_RTS-conditional struct members to end of Capability
Accessing members of the Capability struct from CMM code rely on
accessor macros. (The macros are generated by deriveConstants).
These macros have a single definition. This means that the offsets of
all struct members must *not* vary based on THREADED_RTS vs
!THREADED_RTS. This requires that any struct members that are
conditional on THREADED_RTS must occur after the unconditional struct
members. Hence we move all the ones that are conditional on
THREADED_RTS to the end.
Add a deriveConstants entry for the iomgr member of the Capability
struct, which was the motivation for this change.
Add warning messages to help our future selves. Debugging this took me
a couple hours in gdb!
- - - - -
c254e022 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Make the IOManager API use CapIOManager rather than Capability
This makes the API somewhat more self-contained and more consistent.
Now the IOManager API and each of the backends takes just the I/O
manager structure. Previously we had a bit of a mixture, depending on
whether the function needed access to the Capability or just the
CapIOManager.
We still need access to the cap, so we introduce a back reference to
reach the capability, via iomgr->cap.
Convert all uses in select and poll backends, but not win32 ones.
Convert callers in the scheduler and elsewhere.
Also convert the three CMM primops that call IOManager APIs. They just
need to use Capability_iomgr(MyCapability()).
- - - - -
4f3d8f31 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Split posix/MIO.c out of posix/Signals.c
The MIO I/O manager was secretly living inside the Signals file.
Now it gets its own file, like any other self-respecting I/O manager.
- - - - -
52ce04a9 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rationalise some scheduler run queue utilities
Move them all to the same place in the file.
Make some static that were used only internally.
Also remove a redundant assignment after calling truncateRunQueue that
is already done within truncateRunQueue.
- - - - -
75bbdebc by Duncan Coutts at 2026-07-18T08:49:12-04:00
Rename initIOManager{AfterFork} to {re}startIOManager
These are more accurate names, since these actions happen after
initialisation and are really about starting (or restarting) background
threads.
- - - - -
724c0517 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Free per-cap I/O managers during shutdown and forkProcess
Historically this was not strictly necessary. The select and win32
legacy I/O managers did not maintain any dynamically allocated
resources. The new poll one does (an auxillary table), and so this
should be freed.
After forkProcess, all threads get deleted. This includes threads
waiting on I/O or timers. So as of this patch, resetting the I/O
manager is just about tidying things up. For example, for the poll
I/O manager this will reset the size of the AIOP table (which
otherwise grows but never shrinks).
In future however the re-initialising will become neeecessary for
functionality, since some I/O managers will need to re-initialise
wakeup fds that are set CLOEXEC.
- - - - -
c007d122 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a TODO to the MIO I/O manager
The direction of travel is to make I/O managers per-capability and have
all their state live in the struct CapIOManager. The MIO I/O manager
however still has a number of global variables.
It's not obvious how handle these globals however.
- - - - -
b65ab7b3 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a FIXME note in the Poll I/O manager
- - - - -
daf2bd6f by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add missing updateRemembSetPushClosure in poll I/O manager
For the non-moving GC.
- - - - -
e33ca830 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvement to struct StgAsyncIOOp member outcome
Mention the enumeration names, as well as their numeric values. The rest
of the code uses the enum names.
- - - - -
4edd2579 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Minor doc improvements for StgTSOBlockInfo
Clarify that certain union members are used only by certain legacy
I/O managers. Hopefully we will be able to remove these at some point.
- - - - -
536bedbb by Duncan Coutts at 2026-07-18T08:49:12-04:00
Avoid exporting various win32-specific rts symbols
The BeginPrivate.h / EndPrivate.h scheme works perfectly well on
Windows, but all of the rts/win32/*.h files were not using it.
- - - - -
8139b5ac by Duncan Coutts at 2026-07-18T08:49:12-04:00
Remove wakeupIOManager, ioManagerWakeup and setIOManagerWakeupFd
We no longer need wakeupIOManager for the threaded RTS case, so we can
remove it and the bits only needed to support it. This includes the
pipe/eventfd fd shared between the RTS and the in-library I/O manager
used for waking up the I/O manager thread. The pipe/eventfd still
exists, but it no longer has to be communicated to the RTS, since the
RTS no longer needs to use it.
So we remove the RTS API export setIOManagerWakeupFd, and remove uses of
it within the I/O managers in ghc-internal.
- - - - -
74fe7c66 by Duncan Coutts at 2026-07-18T08:49:12-04:00
Add a new interruptIOManager API for the I/O managers
It will be used to interrupt awaitCompletedTimeoutsOrIO. Also update the
return type and docs for awaitCompletedTimeoutsOrIO to have it return
false when it gets interrupted, and have no useful post condition in
that case.
- - - - -
38792843 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for select I/O manager
Uses the FdWakup mechanism.
- - - - -
2f3b00aa by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for poll I/O manager
Uses the FdWakup mechanism.
A quirk we have to cope with is that we now need to poll one more fd --
the wakeup_fd_r -- but this fd has no corresponding entry in the
aiop_table. This is awkward since we have set up our aiop_poll_table to
be an auxilliary table with matching indicies.
The solution this patch uses (and described in the comments) is to have
two tables: struct pollfd *aiop_poll_table, *full_poll_table;
and to have the aiop_poll_table alias the tail of the full_poll_table.
The head entry in the full_poll_table is the extra fd. So we poll the
full_poll_table, while the aiop_poll_table still has matching indicies
with the aiop_table.
Hurrah for C aliasing rules.
- - - - -
cee50131 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Add interruptIOManager support for win32 legacy I/O manager
And remove unused related helper resetAbandonRequestWait. It is not
called because the event is created in auto-reset mode, so never needs
to be reset manually.
- - - - -
cf453143 by Duncan Coutts at 2026-07-18T08:49:13-04:00
Note lack of interruptIOManager support for WinIO I/O manager
Though there's a plausible design, we can't sanely test it at the moment
due to related WinIO bugs. Filed as issue #27403.
- - - - -
1b74a0ad by Duncan Coutts at 2026-07-18T08:49:13-04:00
Be more explicit about enum IOReadOrWrite values, and type within cmm
Belt and braces.
- - - - -
b388d093 by Brian McKenna at 2026-07-18T17:51:50-04:00
Ignore ticks in the pattern-match term oracle
The term-oracle in the pattern-match checker is keyed by a canonical
form of the scrutinee, computed by `makeDictsCoherent`. That canonical
form was tick-sensitive: two occurrences of an otherwise identical
expression that happened to carry different ticks were treated as
distinct values, breaking long-distance information.
This shows up in practice under `-finfo-table-map`, because the
desugarer wraps every record-selector use site in a `SourceNote`
carrying that site's span. For example:
data Box = Box { unBox :: Maybe Int }
f b = case unBox b of
Nothing -> 0
Just _ -> let Just x = unBox b in x
The two `unBox b` expressionss carry different SourceNote spans, the
pattern-match checker sees them as different, the long-distance
information from the outer `Just _` branch never reaches the
let-pattern, and `Just x = unBox b` is wrongly reported as
non-exhaustive.
We now strip all ticks in `makeDictsCoherent`. This is documented as
Wrinkle (UD1) of Note [Unique dictionaries in the TmOracle CoreMap].
Fixes #27314
- - - - -
c23e1acb by Mrjtjmn at 2026-07-18T17:52:45-04:00
Add explanations for unsolved Typeable constraints
This commit adds explanations for unsolved 'Typeable' constraints.
GHC will now provide additional explanations for an unsolved constraint
of the form 'Typeable ty', explain why GHC did not solve Typeable constraint.
e.g.:
- 'ty' is a polymorphic type (e.g. forall a. a -> a)
- 'ty' is a qualified type (e.g. Eq Int => Int)
- 'ty' is an unboxed sum type
- 'ty' is an unreduced type family application
- 'ty' whose kind is not typeable
Fixes #26532
- - - - -
cbef021e by Artem Pelenitsyn at 2026-07-19T07:49:55-04:00
ghc-internal: Lock.hs: fix typo and indentation
- - - - -
42918646 by Duncan Coutts at 2026-07-19T07:50:36-04:00
Fix failing test GcStaticPointers for non-moving GC
Minor mistake in asserting something before checking for that same
thing.
Specifically, Bdescr asserts HEAP_ALLOCED_GC, but Bdescr was being used
prior to a guard that checks HEAP_ALLOCED_GC. The solution is just to
move the use of Bdescr after the guard.
Thanks to Simon Jakobi for identifying the problem.
- - - - -
c2f6dcd4 by Sasha Bogicevic at 2026-07-20T10:31:56+02:00
Improve error messages for invalid record wildcards
Record wildcard hints are now shown in more contexts and include
constructor arity; matching with `..` on a fieldless constructor
now produces a dedicated error message.
Fixes #21101
- - - - -
4c02e76b by Duncan Coutts at 2026-07-21T10:37:21-04:00
Mark test T27105 as fragile, citing issue #27522
Scheduler fairness is fine, except when it isn't. And it isn't on CI
machines surprisingly often! See the issue for details.
- - - - -
43dd2b15 by Recursion Ninja at 2026-07-21T17:09:53-04:00
Resolving many TTG related orphan type-class instances
This is part a technical debt removal effort made possible now
that separating out the AST via TTG has come to a close.
As the AST in 'L.H.S' has been incrementally separated from the GHC internals,
there are many accumulated orphan instance of 'Binary', 'NFData', 'Outputable',
and 'Uniquable'. The orphan instance of data-types from within 'L.H.S' have had
their orphan instances moved to either:
1. The module which defines the data-type
2. The module which defines the type-class;
i.e. moving an orphan 'Binary' instance to 'GHC.Utils.Binary'
Orphan instances resolved (37):
| Data-type | Resolved instance(s) | Former orphan module(s) |
| -------------------- | -------------------------- | ------------------------- |
| Role | Binary, NFData, Outputable | GHC.Core.Coercion.Axiom |
| SrcStrictness | Binary, NFData, Outputable | GHC.Core.DataCon |
| SrcUnpackedness | Binary, NFData, Outputable | GHC.Core.DataCon |
| Fixity | Binary, Outputable | GHC.Hs.Basic |
| FixityDirection | Binary, Outputable | GHC.Hs.Basic |
| LexicalFixity | Outputable | GHC.Hs.Basic |
| CCallTarget | NFData | GHC.Hs.Decls.Foreign |
| CType | NFData | GHC.Hs.Decls.Foreign |
| Header | NFData | GHC.Hs.Decls.Foreign |
| OverlapMode | Binary, NFData | GHC.Hs.Decls.Overlap |
| WithHsDocIdentifiers | NFData, Outputable | GHC.Hs.Doc |
| HsDocString | NFData | GHC.Hs.DocString |
| HsDocStringChunk | Binary, Outputable | GHC.Hs.DocString |
| HsDocStringDecorator | Binary, Outputable | GHC.Hs.DocString |
| NamespaceSpecifier | Outputable | GHC.Hs.ImpExp |
| ForAllTyFlag | Binary, NFData, Outputable | GHC.Hs.Specificity |
| Specificity | Binary, NFData | GHC.Hs.Specificity |
| PromotionFlag | Binary, Outputable | GHC.Types.Basic |
| FieldLabelString | Outputable, Uniquable | GHC.Types.FieldLabel |
| InlinePragma | Binary | GHC.Types.InlinePragma |
-------------------------
Metric Decrease:
hard_hole_fits
-------------------------
Closes #21262, #27469
- - - - -
ab9ab895 by Cheng Shao at 2026-07-21T17:10:53-04:00
rts: always use StgInt to represent cost center id
Currently cost center id is modeled as `Int` and it should be `StgInt`
uniformly in the RTS, hence this patch. Fixes #27524.
- - - - -
94d8f83b by Cheng Shao at 2026-07-22T11:30:40-04:00
hadrian: clean up stale cabal package flags in the tree
This patch cleans up stale cabal package flags in the tree and related
hadrian/autoconf logic. Closes #27474.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
0bf1d8c9 by Sasha Bogicevic at 2026-07-22T11:31:21-04:00
parser: don't suggest ImportQualifiedPost when it is already enabled
-Wprepositive-qualified-module unconditionally attached a hint to
enable ImportQualifiedPost, even when the extension was already on
(as it is by default under GHC2021). Record the extension's state in
the PsWarnImportPreQualified diagnostic and drop the hint when it is
already enabled.
Fixes #27380
- - - - -
700a1dd1 by Simon Jakobi at 2026-07-23T11:21:20-04:00
ci: Reduce lint job setup costs
Avoid fetching unnecessary history and submodules for lightweight lint
jobs. Run changelog validation without Hadrian.
Because the lint-author job is now based on the .lint template directly,
we enhance it to allow Git to read from the runner-owned checkouts,
In the previously used .lint-params template, this permissions issue was
addressed via `chown`.
Closes #27521.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
26a44fb0 by ARATA Mizuki at 2026-07-23T11:22:10-04:00
testsuite: Fix memory issues of doublex2_* and simd010
doublex2_* had reads from uninitialized memory.
simd010 had out-of-bounds array access.
Fixes #27544
- - - - -
4d798b17 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Eliminate STM_AWOKEN
It was used as nullary closure for the block_info.closure in the case of
a thread being awoken after an STM transaction.
However, while it was written, it was never read, so contributed nothing
to the behaviour. Furthermore, in the only place it was set (in
tryWakeupThread) the why_blocked was immediately overwritten by the
NotBlocked status, and the block_info was updated accordingly (by
appendToRunQueue).
So it didn't even serve a purpose of clarifying an intermediate state,
there really was no such intermediate state.
Cleaning this up will allow the BlockedOnSTM case to follow the same
pattern as the other why_blocked cases that do not use the block_info,
and in turn this reduces the number of different categories.
- - - - -
e1cece79 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document that eventlog thread stop code ThreadBlocked is no longer used
It has not been used since GHC 7.0.x (2011). In 7.2 all the BlockedOn*
codes were added, and these were and are used instead of ThreadBlocked.
- - - - -
795db115 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a proper mapping to eventlog external thread stop status
That is the mapping from rts-internal codes, to the coes used in the
status field in the eventlog EVENT_STOP_THREAD event.
See issue #9003 for what goes wrong when we mess this up. In that
ticket, people note that we should really not require the internal
tso->why_blocked codes to leak into the external eventlog thread stop
codes. The same principle applies to the StgThreadReturnCode.
This change properly separates them, and explicitly maps between them
using a pair of (compact, constant) tables. These tables are pretty
small (with no alignment constraints) and will soon shrink so it seems
a sensible tradeoff.
We also introduce and use proper EVENT_STOP_THREAD constants in the
event log format header. Previously there was not specification in the
code for these (only in the docs): the values were encoded into the
conversion code.
This will allow us to renumber the internal why_blockd codes without
breaking the eventlog output.
- - - - -
6f1c8efa by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove unused tso->block_info.wakeup member
Presumably it was used once, but not now.
- - - - -
740b88a9 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Document StgTSOBlockInfo to say what cases use what members
In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union,
so we should be able to say for each union member the why_blocked cases
that use that member.
- - - - -
5b92eae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.mvar member and use it
in preference to the generic block_info.closure union member, with
casts.
The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.
- - - - -
d931715f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Add a tso->block_info.unused member and use it
in preference to the generic block_info.closure union member, with
casts.
The plan is that when we know what case we're in (via tso->why_blocked)
then we can always access the correct union member, and so we will only
need to access block_info.closure for generic cases where we don't know
or don't care.
- - - - -
47e28ebb by Duncan Coutts at 2026-07-23T17:26:18-04:00
Avoid storing to tso->block_info.closure
In one case we can use a specific union member (.prev) instead. In
several cases the stores were in fact redundant because of subsequent
overwrites.
In scavengeTSO we replace setting tso->block_info.closure to a valid
closure, with an assertion that the block_info.unused is already set to
END_TSO_QUEUE which is a valid (static) closure.
- - - - -
96e4749d by Duncan Coutts at 2026-07-23T17:26:18-04:00
Renumber the tso->why_blocked constants
We can do this now because we have separated the internal values from
the external ones used in the eventlog.
This lets us put them back into a deliberate order and consolodate some
gaps.
More importantly, it is a prepation for a slightly more sophisticated
encoding.
- - - - -
8f62661c by Duncan Coutts at 2026-07-23T17:26:18-04:00
Define constants for the existing stg_threadStatuszh return codes
The stg_threadStatuszh reuses the internal tso->why_blocked codes but
also extends them with a couple previously magic values. This is awkward
since we need to know what those magic values are so we don't
accidentally use those values to mean something else. By pulling a
definition up to where the why_blocked codes are defined we will be able
to avoid mistakenly assining those codes some meaning (or just changing
the BlockedThreadComplete, BlockedThreadKilled code if necessary).
- - - - -
42c69ae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Extend the tso->why_blocked encoding to indicate block_info closures
We use some bit tricks to cheaply and generically test if a
tso->why_blocked tag implies that the corresponding tso->block_info will
contain a non-trivial valid closure (i.e. not just block_info.unused set
to END_TSO_QUEUE).
In particular we arrange for most why_blocked values to naturally have a
distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they
can come in either non-closure or closure forms. We allow an additional
bit to distinguish these cases. The non-closure forms are only from
legacy I/O managers: select and win32-legacy. So this extra bit
mechanism will be able to be retired once the legacy I/O managers are
themselves retired.
This means in a few places we need to untag the why_blocked value before
inspecting it, but in most places we do not.
- - - - -
7c64632b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the select I/O manager
- - - - -
8fd7104a by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use BlockInfoForceNonClosure in the win32-legacy I/O manager
for the BlockedOn{Read,Write} since these use the non-heap allocated
StgAsyncIOResult.
- - - - -
e0da603b by Duncan Coutts at 2026-07-23T17:26:18-04:00
Enforce the why_blocked and block_info rules in checkTSO
We now check the cases wher IsBlockInfoClosure should hold, the cases
that are supposed to use block_info.unused == END_TSO_QUEUE, and which
cases are allowed to use BlockInfoForceNonClosure.
This partially enforces the use of why_blocked as a tag for the
block_info union. We could be stricter and check for the correct
expected info table for the closure cases.
- - - - -
1dd0f381 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Use IsBlockInfoClosure to simplify several tests
In GC and generic traversal we need to know if we should look at the
block_info.closure or not. Now we can do just that using a cheap bit
test on the why_blocked tag.
This fixes issue 26717, where the problem was that some GC modes did not
know when to look at block_info.closure, because the poll I/O manager
uses a closure for BlockedOn{Read,Write} while the select I/O manager
uses a non-closure. Now this information is in the why_blocked tag
itself.
- - - - -
7a00ffbc by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove the now-unused scavengeTSOIOManager
The GC no longer has to delegate to the I/O manager, since it can use
IsBlockInfoClosure to decide things itself.
- - - - -
522a481f by Duncan Coutts at 2026-07-23T17:26:18-04:00
Remove duplicate assertion
- - - - -
0874d965 by Duncan Coutts at 2026-07-23T17:26:18-04:00
Follow atomic access rules more consistently for tso->why_blocked
The rule is this:
store block_info *before* why_blocked
store why_blocked using store release
load why_blocked using load acquire
load block_info *after* why_blocked
This is a an atomic store release / load acquire pair and (if the reads
are in a separate thread to the writes, and the read receives the value
stored) then this guarantees a full "happens before" relationship of
these stores and loads.
In some cases, we do not need a full load acquire, because we don't read
the block_info at all and so do not need any ordering. In this case we
just need an atomic relaxed load.
This was being followed in most places, but not all. If there's good
reason in any case that we don't need atomic access, then we should
document that in a comment. In the absence of that I think it's easier
to follow the rule everywhere.
- - - - -
8f0bdbe1 by Duncan Coutts at 2026-07-23T17:26:19-04:00
Add a changelog entry
- - - - -
4fdfe757 by Alan Zimmerman at 2026-07-23T17:27:06-04:00
EPA: Keep decls together in ClassDecl
Similar to 1718230f4d3d19d8c49c0e5d496cb0fb6f399528 for HsValBindsLR,
this commit updates ClassDecl so that it no longer splits out the
assorted `LHsDecl GhcPs` until the renamer.
It does this by inserting a type family (separate from the classic TTG one) for this.
So
data TyClDecl
...
| ClassDecl {
...
tcdDecls :: XClassDecls pass
with
type instance XClassDecls GhcPs = [LHsDecl GhcPs]
type instance XClassDecls GhcRn = ClassDeclX GhcRn
type instance XClassDecls GhcTc = ClassDeclX GhcTc
data ClassDeclX pass
= ClassDeclX { tcdSigs :: [LSig pass], -- ^ Methods' signatures
tcdMeths :: LHsBinds pass, -- ^ Default methods
tcdATs :: [LFamilyDecl pass], -- ^ Associated types;
tcdATDefs :: [LTyFamDefltDecl pass], -- ^ Associated type defaults
tcdDocs :: [LDocDecl pass] -- ^ Haddock docs
}
- - - - -
f586c885 by Simon Jakobi at 2026-07-24T18:05:00-04:00
ci: Use shallow submodule clones by default
Limit submodule clones to depth one to reduce CI checkout costs. Keep
fetching full submodule history for the submodule lint jobs, which
inspect commits across a range.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
306120d2 by Duncan Coutts at 2026-07-24T18:05:43-04:00
Fix flaky test T3994 on FreeBSD
On current FreeBSD versions, calling getpgid on a zombie process fails.
In T3994, if we're really unlucky with delays and scheduling then we can
end up in exactly that situation.
Just catch that specific exception and ignore it. It's rare, and not our
fault.
- - - - -
7b116a0b by Cheng Shao at 2026-07-24T18:06:24-04:00
ci: add missing workaround for docker permissions in lint jobs
Some lint jobs use ci-images with default user `ghc`, and the gitlab
ci docker executor requires the `sudo chown` workaround to fix
workspace directory permission issue. This patch adds the missing
workarounds for the lint jobs. Fixes #27554.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
815149f3 by Andrzej Rybczak at 2026-07-25T15:06:43+00:00
Add -Wdefaulted-callstack
Adds a new warning, -Wdefaulted-callstack, which warns when an implicit
CallStack parameter is defaulted to the empty stack. In particular, this
includes call sites where a function with a HasCallStack constraint is called
from a definition that does *not* provide one. At such call sites the call stack
is cut off and does not include the enclosing definition's callers, which can be
a source of surprise if the user wants complete call stacks.
Closes #27077.
- - - - -
f6f2343f by Zubin Duggal at 2026-07-25T17:40:51-04:00
UniqueDFM: alter should preserve insertion order
Before it always inserting new elements at the end.
This is problematic because instances get inserted into the map with
`alterF`, which can change ordering of how instances are printed
with `:info` depending on the order in which we consult interfaces
I expect `alter id k = id` and `alter (fmap f) k = adjust f k`. Moving keys to
the end breaks that (`adjust` already preserves position).
Fixes #27532
- - - - -
5d0ab71a by fendor at 2026-07-27T17:31:05-04:00
Introduce global unit database cache
As a first step for better sharing of `UnitInfo` across `UnitEnv`,
we introduce a new datatype called `ExternalUnitDatabases`.
It primarily serves as an in-memory representation of *all*
`UnitDatabase`s across `UnitEnv`. This means, if multiple `HomeUnitEnv`s
depend on the same database, one way or another, we make sure that we
don't parse from disk every time.
Instead, we store the in-memory representation in `ExternalUnitDatabases`.
`ExternalUnitDatabaseCache` is the equivalent of `ExternalUnitState` in
the `UnitEnv`. It is a mutable variable wrapping `ExternalUnitDatabases`.
The mutable `ExternalUnitDatabaseCache` is used in `initUnits` to make
sure we don't parse the same unit database multiple times.
Almost by accident, we change the semantics of `initUnits` to honour
modifications to `packageDBFlags`.
The inability to change `packageDBFlags` while also reusing the already
parsed `UnitDatabase`s was reported in #26423 as a bug.
Hence, we think this behaviour change is warranted and acceptable,
especially since it comes with a breaking change to the `initUnits` API.
Add regression test for #26423
Closes #26423
- - - - -
6cce494a by fendor at 2026-07-27T17:31:05-04:00
Introduce UnitIndex for global external unit caching
`UnitInfo`s have been observed to cause a lot of memory usage in #27500.
Especially with multiple home units, as the same (external) units are
processed from scratch, even though most of the time we end up with
exactly the same `UnitInfo`.
We introduce a `UnitEnv` global cache that allows us to store external
unit information that is used across all `HomeUnitEnv`s.
The most important change in this commit is the introduction of the `UnitIndex`.
It stores a global mapping of `UnitId` -> `UnitInfo`, and `initUnits`
always uses the cached `UnitInfo` entry to populate each
`HomeUnitEnv`'s `UnitState`.
This allows us to ensure the following property:
> Each `UnitInfo` should be alive exactly once in GHC.
All `UnitState`s should reference 'UnitInfo's stored in the 'UnitIndex'.
This ensured by calling 'initUnits' with the 'UnitIndex'.
In addition, the `ExternalUnitDatabases` may also hold a reference
to each on-disk representation of `UnitInfo`.
This means, we impose an hard upper bound on the number of `UnitInfo`s
alive in the GHC session:
> The number of alive `UnitInfo`s closure objects must be the
> sum of all loaded unit database times two.
We add performance regression tests that make sure the number of live
`UnitInfo` cannot exceed this threshold.
Closes #27500
-------------------------
Metric Decrease:
MultiComponentModules
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
mhu-perf
LinkableUsage02
-------------------------
These metrics increases are especially notable, as we are not even
sharing anything big but merely the global package database with 50
entries.
It shows how careful sharing of `UnitInfo` can improve memory usage.
We expect this to be much more notable when the whole cabal package
database is shared across multiple home units.
`LinkableUsage02` metric decreases on unreg and i386 platform, only.
---
Technical details
To share the `UnitInfo`s correctly, it is important that we extract
the `WireMap` into the `UnitIndex`. At the moment of writing, `WireMap`
must be globally the same for all `HomeUnitEnv`s.
This is important, as we could otherwise not cache the "fully-resolved"
`UnitInfo`, as we don't change the `UnitId` or `unitAbiHash` when
resolving wired-in units. Thus, there could be ambiguities, when the
`WireMap` is not the same for all `UnitState`s across the `UnitEnv`.
We consider a `UnitInfo` fully-resolved, if wired-in units have been
updated, the `UnitInfo` has been validated and variables in the unit
config, such as `${pkgroot}` have been resolved.
Updating the wired-in units requires the `WireMap` to be globally the
same.
- - - - -
f8e3bee9 by Zubin Duggal at 2026-07-27T17:31:49-04:00
testsuite: skip runtime stats tests on debugged compilers
Debugged flavours build the boot libraries without optimisation, so the
runtime numbers do not match the baselines.
- - - - -
1e326770 by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: mark #20706 tests fragile rather than broken
Whether the static linux linker issues manifest depends on the host
toolchain.
- - - - -
c0b13cbe by Zubin Duggal at 2026-07-27T17:31:50-04:00
testsuite: exclude libnuma from mostly-static
It needs static system libraries (libnuma.a) that many platforms do not
ship.
Fixes #26914
- - - - -
bee1913d by Alan Zimmerman at 2026-07-28T16:42:29-04:00
EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs
Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit
changes the as-parsed representation of class instance declarations to
[LHsDecl GhcPs], and only separates them by type from the renamer onward.
This also allows us to remove all the AnnSortKey machinery for exact
printing, as it is now no longer needed.
- - - - -
72c55eee by Cheng Shao at 2026-07-28T16:43:11-04:00
hadrian: implement and use writeFileAtomic to fix race condition
This patch implements `writeFileAtomic` in hadrian and change all
invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`,
to avoid multiple hadrian concurrent invocations overwriting the same
in-tree generated file not in the build root directory. Fixes #27536.
Additional notes:
- `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since
it involves reading the file's older version, so their uses are left
alone. It doesn't affect #27536 given their outputs are contained in
the build root directory.
- It's possible to shrink this patch by only making writes outside the
build root directory atomic. But I think it's not worth the effort
for fine grained distinction here, and atomic writes within the
build root directory should also improve robustness of a hadrian
build.
- In the longer term we do want to make a ghc build only generate
files within the build root directory, though that's a lot of work
and outside the scope of this particular bugfix.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
46d4f963 by Sylvain Henry at 2026-07-29T06:38:40-04:00
RTS: correctly mark slop bytes when shrinking large arrays (#19048)
Correctly mark slop bytes even when profiling is off so that heap census
doesn't traverse garbage-collected closures.
- - - - -
4762a8bf by Simon Jakobi at 2026-07-29T06:39:23-04:00
Add -XLazyFieldAnnotations (GHC proposal 752)
Unbundle the prefix `~` lazy field annotation syntax from StrictData. The
new LazyFieldAnnotations extension controls whether `~` is accepted on
constructor fields. StrictData (and Strict, transitively) imply the new
extension.
See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-l….
Closes #24455.
Assisted-by: Claude Opus 4.8
- - - - -
0b6dcc84 by Simon Jakobi at 2026-07-29T06:40:04-04:00
testsuite: Relax T24471 residency tolerance
T24471 peak residency fluctuates enough on i386 to cause spurious
failures. Use the standard residency tolerance while retaining the
existing allocation threshold.
See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303.
Assisted-by: gpt-5.6-sol via Codex CLI
- - - - -
90e95b34 by Cheng Shao at 2026-07-29T06:40:45-04:00
compiler: fix missing top-level procedure labels in cmm dumps
This patch fixes missing top-level procedure labels in some
intermediate Cmm pass dumps. Fixes #27553.
Co-authored-by: Codex <codex(a)openai.com>
- - - - -
360a5946 by sheaf at 2026-07-29T06:41:35-04:00
Add some type-family-heavy performance tests
FamAppCachePerf stress-tests the performance of lookups in the
type family application cache.
T27336 is a minimisation extracted from the reported reproducer.
SimplCastPerf is a measure of coercion growth due to the simplifier
calling mkTransCo without re-optimising the result.
- - - - -
3ec9e2b9 by Mike Pilgrem at 2026-07-31T08:21:33-04:00
GHC Guide: Improve docs on response files
- - - - -
e5b2a1f7 by sheaf at 2026-07-31T08:22:23-04:00
Disable Core Lint for TcPlugin_RewritePerf
This is a compiler performance test, but the test source hard-coded
-dcore-lint, defeating the measurement.
-------------------------
Metric Decrease:
TcPlugin_RewritePerf
-------------------------
- - - - -
85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00
EPA: Remove LocatedP from OverlapMode
We have
type LocatedP = GenLocated SrcSpanAnnP
type SrcSpanAnnP = EpAnn AnnPragma
As the first step in removing this in favour of LocatedA which only
captures location, comments and trailing annotations, we remove it
from OverlapMode
We do this by moving the AnnPragma into the TTG extension point
instead.
- - - - -
c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00
Fix note typo
- - - - -
4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00
Apply oneShot Monad trick to STG LintM
- - - - -
21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00
stgLint: Use a single reader env for read only arguments.
- - - - -
d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00
EPA: Remove LocatedP from CType
The next step of removing use of LocatedP by moving
the AnnPragma for CType into its TTG extension point
instead.
- - - - -
42d83c74 by Simon Peyton Jones at 2026-08-04T11:57:05+02:00
Major patch to re-engineer known-key names
This big patch implements the New Plan for known-key names,
described in #27013.
Read the big Note [Overview of known-key names] in GHC.Types.Name
Some things had to be reworked slightly to accomodate the new known-keys
design. A significant one was the generation of auxiliary KindRep
bindings, which was greatly simplified. Note [Grand plan for Typeable]
was updated accordingly. Another example: GHC.Internal.CString was
merged into GHC.Internal.Types.
Co-authored-by: Rodrigo Mesquita <rodrigo.m.mesquita(a)gmail.com>
The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed
Metrics: compile_time/bytes allocated
-------------------------------------
Baseline
Test Metric value New value Change
------------------------------------------------------------------------------------------
MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD
MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD
MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD
MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD
T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD
T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD
T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD
T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD
T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD
T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD
hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD
mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD
geo. mean +0.1%
minimum -8.0%
maximum +5.4%
All performance regressions were investigated in depth. The surviving
ones:
- MultiComponentModules100, MultiComponentModulesRecomp100,
MultiComponentModulesRecomp regresses because existing bugs that make
an additional implicit edge do too much redundant work: #27053 and #27461
- T13820, T18140, T10547, T13035 regress because we load an additional
interface and associated Names for GHC.Essentials.
-------------------------
Metric Decrease:
MultiLayerModules
T13701
T14697
T26989
T4801
T783
hard_hole_fits
mhu-perf
size_hello_obj
Metric Increase:
LinkableUsage01
MultiComponentModules100
MultiComponentModulesRecomp
MultiComponentModulesRecomp100
T10547
T13035
T13820
T18140
T20049
-------------------------
Bumps submodule binary
Closes #27013
- - - - -
6b691ee2 by sheaf at 2026-08-04T12:14:47+02:00
Allow GHC.Essentials to be hidden
- - - - -
1057 changed files:
- .gitlab-ci.yml
- .gitlab/ci.sh
- + changelog.d/21101
- + changelog.d/27380
- + changelog.d/27532
- + changelog.d/T26423
- + changelog.d/T26532
- + changelog.d/T26716
- + changelog.d/T27314.md
- + changelog.d/T27329
- + changelog.d/T27374
- + changelog.d/fix-cmm-dump-labels
- + changelog.d/fix-heap-census-large-arrays-19048
- + changelog.d/fix-make-install-j
- + changelog.d/lazy-field-annotations
- + changelog.d/refactor-known-names
- + changelog.d/unit-index
- + changelog.d/warn-defaulted-callstack
- compiler/GHC.hs
- + compiler/GHC/Builtin.hs
- + compiler/GHC/Builtin/KnownKeys.hs
- + compiler/GHC/Builtin/KnownOccs.hs
- + compiler/GHC/Builtin/Modules.hs
- − compiler/GHC/Builtin/Names.hs
- − compiler/GHC/Builtin/Names/TH.hs
- compiler/GHC/Builtin/PrimOps.hs
- compiler/GHC/Builtin/PrimOps/Casts.hs
- compiler/GHC/Builtin/PrimOps/Ids.hs
- + compiler/GHC/Builtin/TH.hs
- compiler/GHC/Builtin/Uniques.hs
- compiler/GHC/Builtin/Uniques.hs-boot
- − compiler/GHC/Builtin/Utils.hs
- + compiler/GHC/Builtin/WiredIn/Ids.hs
- compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs
- compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs
- compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs
- compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot
- compiler/GHC/ByteCode/Asm.hs
- compiler/GHC/Cmm/Pipeline.hs
- compiler/GHC/Core.hs
- compiler/GHC/Core/Coercion.hs
- compiler/GHC/Core/Coercion/Axiom.hs
- compiler/GHC/Core/Coercion/Opt.hs
- compiler/GHC/Core/DataCon.hs
- compiler/GHC/Core/FVs.hs
- compiler/GHC/Core/FamInstEnv.hs
- compiler/GHC/Core/Lint.hs
- compiler/GHC/Core/Make.hs
- compiler/GHC/Core/Multiplicity.hs
- compiler/GHC/Core/Opt/Arity.hs
- compiler/GHC/Core/Opt/ConstantFold.hs
- compiler/GHC/Core/Opt/CprAnal.hs
- compiler/GHC/Core/Opt/DmdAnal.hs
- compiler/GHC/Core/Opt/LiberateCase.hs
- compiler/GHC/Core/Opt/OccurAnal.hs
- compiler/GHC/Core/Opt/SetLevels.hs
- compiler/GHC/Core/Opt/Simplify/Env.hs
- compiler/GHC/Core/Opt/Simplify/Iteration.hs
- compiler/GHC/Core/Opt/SpecConstr.hs
- compiler/GHC/Core/Opt/Specialise.hs
- compiler/GHC/Core/Opt/WorkWrap/Utils.hs
- compiler/GHC/Core/Ppr.hs
- compiler/GHC/Core/Predicate.hs
- compiler/GHC/Core/Rules.hs
- compiler/GHC/Core/SimpleOpt.hs
- compiler/GHC/Core/Subst.hs
- compiler/GHC/Core/TyCo/FVs.hs
- compiler/GHC/Core/TyCo/Rep.hs
- compiler/GHC/Core/TyCon.hs
- compiler/GHC/Core/Type.hs
- compiler/GHC/Core/Unfold.hs
- compiler/GHC/Core/Unify.hs
- compiler/GHC/Core/Utils.hs
- compiler/GHC/CoreToIface.hs
- compiler/GHC/CoreToStg.hs
- compiler/GHC/CoreToStg/Prep.hs
- compiler/GHC/Driver/Backpack.hs
- compiler/GHC/Driver/Config/Tidy.hs
- compiler/GHC/Driver/Downsweep.hs
- compiler/GHC/Driver/DynFlags.hs
- compiler/GHC/Driver/Env.hs
- compiler/GHC/Driver/Env/KnotVars.hs
- compiler/GHC/Driver/Env/Types.hs
- compiler/GHC/Driver/Flags.hs
- compiler/GHC/Driver/Main/Hsc.hs
- compiler/GHC/Driver/Main/Interactive.hs
- compiler/GHC/Driver/Main/Passes.hs
- compiler/GHC/Driver/MakeFile.hs
- compiler/GHC/Driver/Pipeline.hs
- compiler/GHC/Driver/Pipeline/Execute.hs
- compiler/GHC/Driver/Plugins.hs
- compiler/GHC/Driver/Session.hs
- compiler/GHC/Driver/Session/Units.hs
- compiler/GHC/Hs/Basic.hs
- compiler/GHC/Hs/Decls.hs
- compiler/GHC/Hs/Decls/Overlap.hs
- compiler/GHC/Hs/Doc.hs
- compiler/GHC/Hs/DocString.hs
- compiler/GHC/Hs/Expr.hs
- compiler/GHC/Hs/ImpExp.hs
- compiler/GHC/Hs/Instances.hs
- compiler/GHC/Hs/Lit.hs
- compiler/GHC/Hs/Pat.hs
- − compiler/GHC/Hs/Specificity.hs
- compiler/GHC/Hs/Stats.hs
- compiler/GHC/Hs/Syn/Type.hs
- compiler/GHC/Hs/Type.hs
- compiler/GHC/Hs/Utils.hs
- compiler/GHC/HsToCore.hs
- compiler/GHC/HsToCore/Arrows.hs
- compiler/GHC/HsToCore/Binds.hs
- compiler/GHC/HsToCore/Docs.hs
- compiler/GHC/HsToCore/Expr.hs
- compiler/GHC/HsToCore/Foreign/C.hs
- compiler/GHC/HsToCore/Foreign/Call.hs
- compiler/GHC/HsToCore/Foreign/JavaScript.hs
- compiler/GHC/HsToCore/Foreign/Utils.hs
- compiler/GHC/HsToCore/Foreign/Wasm.hs
- compiler/GHC/HsToCore/ListComp.hs
- compiler/GHC/HsToCore/Match.hs
- compiler/GHC/HsToCore/Match/Literal.hs
- compiler/GHC/HsToCore/Monad.hs
- compiler/GHC/HsToCore/Pmc/Check.hs
- compiler/GHC/HsToCore/Pmc/Desugar.hs
- compiler/GHC/HsToCore/Pmc/Ppr.hs
- compiler/GHC/HsToCore/Pmc/Solver.hs
- compiler/GHC/HsToCore/Pmc/Solver/Types.hs
- compiler/GHC/HsToCore/Quote.hs
- compiler/GHC/HsToCore/Types.hs
- compiler/GHC/HsToCore/Utils.hs
- compiler/GHC/Iface/Binary.hs
- compiler/GHC/Iface/Env.hs
- − compiler/GHC/Iface/Env.hs-boot
- compiler/GHC/Iface/Errors/Ppr.hs
- compiler/GHC/Iface/Errors/Types.hs
- compiler/GHC/Iface/Ext/Ast.hs
- compiler/GHC/Iface/Load.hs
- compiler/GHC/Iface/Make.hs
- compiler/GHC/Iface/Recomp.hs
- compiler/GHC/Iface/Syntax.hs
- compiler/GHC/Iface/Tidy.hs
- compiler/GHC/Iface/Type.hs
- compiler/GHC/IfaceToCore.hs
- compiler/GHC/Parser.y
- compiler/GHC/Parser/Annotation.hs
- compiler/GHC/Parser/Errors/Ppr.hs
- compiler/GHC/Parser/Errors/Types.hs
- compiler/GHC/Parser/Header.hs
- compiler/GHC/Parser/PostProcess.hs
- compiler/GHC/Parser/PostProcess/Haddock.hs
- compiler/GHC/Plugins.hs
- compiler/GHC/Rename/Env.hs
- compiler/GHC/Rename/Expr.hs
- compiler/GHC/Rename/HsType.hs
- compiler/GHC/Rename/Lit.hs
- compiler/GHC/Rename/Module.hs
- compiler/GHC/Rename/Names.hs
- compiler/GHC/Rename/Pat.hs
- compiler/GHC/Rename/Splice.hs
- compiler/GHC/Rename/Unbound.hs
- compiler/GHC/Rename/Utils.hs
- compiler/GHC/Runtime/Context.hs
- compiler/GHC/Runtime/Debugger.hs
- compiler/GHC/Runtime/Eval.hs
- compiler/GHC/Runtime/Heap/Inspect.hs
- compiler/GHC/Runtime/Interpreter.hs
- compiler/GHC/Runtime/Loader.hs
- compiler/GHC/Stg/BcPrep.hs
- compiler/GHC/Stg/Lint.hs
- compiler/GHC/Stg/Unarise.hs
- compiler/GHC/StgToByteCode.hs
- compiler/GHC/StgToCmm/Bind.hs
- compiler/GHC/StgToCmm/DataCon.hs
- compiler/GHC/StgToCmm/Env.hs
- compiler/GHC/StgToCmm/Foreign.hs
- compiler/GHC/StgToCmm/Lit.hs
- compiler/GHC/StgToCmm/Ticky.hs
- compiler/GHC/StgToJS/Apply.hs
- compiler/GHC/StgToJS/Arg.hs
- compiler/GHC/StgToJS/Expr.hs
- compiler/GHC/StgToJS/FFI.hs
- compiler/GHC/StgToJS/Linker/Utils.hs
- compiler/GHC/StgToJS/Utils.hs
- compiler/GHC/Tc/Deriv.hs
- compiler/GHC/Tc/Deriv/Functor.hs
- compiler/GHC/Tc/Deriv/Generate.hs
- compiler/GHC/Tc/Deriv/Generics.hs
- compiler/GHC/Tc/Deriv/Infer.hs
- compiler/GHC/Tc/Deriv/Utils.hs
- compiler/GHC/Tc/Errors.hs
- compiler/GHC/Tc/Errors/Hole.hs
- compiler/GHC/Tc/Errors/Ppr.hs
- compiler/GHC/Tc/Errors/Types.hs
- compiler/GHC/Tc/Gen/App.hs
- compiler/GHC/Tc/Gen/Arrow.hs
- compiler/GHC/Tc/Gen/Bind.hs
- compiler/GHC/Tc/Gen/Default.hs
- compiler/GHC/Tc/Gen/Export.hs
- compiler/GHC/Tc/Gen/Expr.hs
- compiler/GHC/Tc/Gen/Foreign.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/Sig.hs
- compiler/GHC/Tc/Gen/Splice.hs
- compiler/GHC/Tc/Instance/Class.hs
- compiler/GHC/Tc/Instance/FunDeps.hs
- compiler/GHC/Tc/Instance/Typeable.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/FunDeps.hs
- compiler/GHC/Tc/Solver/InertSet.hs
- compiler/GHC/Tc/Solver/Monad.hs
- compiler/GHC/Tc/Solver/Rewrite.hs
- compiler/GHC/Tc/TyCl.hs
- compiler/GHC/Tc/TyCl/Build.hs
- compiler/GHC/Tc/TyCl/Class.hs
- compiler/GHC/Tc/TyCl/Instance.hs
- compiler/GHC/Tc/TyCl/PatSyn.hs
- compiler/GHC/Tc/TyCl/Utils.hs
- compiler/GHC/Tc/Types.hs
- compiler/GHC/Tc/Types/Constraint.hs
- compiler/GHC/Tc/Types/Evidence.hs
- compiler/GHC/Tc/Types/LclEnv.hs
- compiler/GHC/Tc/Types/Origin.hs
- compiler/GHC/Tc/Types/Rank.hs
- compiler/GHC/Tc/Utils/Backpack.hs
- compiler/GHC/Tc/Utils/Concrete.hs
- compiler/GHC/Tc/Utils/Env.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/Validity.hs
- compiler/GHC/Tc/Zonk/Type.hs
- compiler/GHC/ThToHs.hs
- compiler/GHC/Types/Basic.hs
- compiler/GHC/Types/DefaultEnv.hs
- compiler/GHC/Types/Error/Codes.hs
- compiler/GHC/Types/FieldLabel.hs
- compiler/GHC/Types/Fixity.hs
- compiler/GHC/Types/ForeignCall.hs
- compiler/GHC/Types/GREInfo.hs
- compiler/GHC/Types/Hint.hs
- compiler/GHC/Types/Hint/Ppr.hs
- compiler/GHC/Types/Id/Make.hs
- compiler/GHC/Types/InlinePragma.hs
- compiler/GHC/Types/Literal.hs
- compiler/GHC/Types/Name.hs
- compiler/GHC/Types/Name/Cache.hs
- compiler/GHC/Types/Name/Ppr.hs
- compiler/GHC/Types/Name/Reader.hs
- compiler/GHC/Types/RepType.hs
- compiler/GHC/Types/TyThing.hs
- compiler/GHC/Types/Unique.hs
- compiler/GHC/Types/Unique/DFM.hs
- compiler/GHC/Types/Unique/FM.hs
- compiler/GHC/Types/Var.hs
- compiler/GHC/Unit.hs
- compiler/GHC/Unit/Env.hs
- compiler/GHC/Unit/External.hs
- + compiler/GHC/Unit/External/Database.hs
- + compiler/GHC/Unit/External/Index.hs
- + compiler/GHC/Unit/External/ModuleOrigin.hs
- + compiler/GHC/Unit/External/Providers.hs
- + compiler/GHC/Unit/External/Query.hs
- + compiler/GHC/Unit/External/Substitution.hs
- + compiler/GHC/Unit/External/Validate.hs
- + compiler/GHC/Unit/External/Visibility.hs
- + compiler/GHC/Unit/External/Wired.hs
- compiler/GHC/Unit/Finder.hs
- compiler/GHC/Unit/Finder/Types.hs
- compiler/GHC/Unit/Home/Graph.hs
- compiler/GHC/Unit/Info.hs
- compiler/GHC/Unit/Module/Deps.hs
- compiler/GHC/Unit/Module/ModSummary.hs
- compiler/GHC/Unit/State.hs
- compiler/GHC/Unit/State.hs-boot
- compiler/GHC/Unit/Types.hs
- compiler/GHC/Utils/Binary.hs
- − compiler/GHC/Utils/Binary/Typeable.hs
- compiler/GHC/Utils/Outputable.hs
- compiler/Language/Haskell/Syntax/Basic.hs
- compiler/Language/Haskell/Syntax/Binds.hs
- compiler/Language/Haskell/Syntax/Decls.hs
- compiler/Language/Haskell/Syntax/Decls/Foreign.hs
- compiler/Language/Haskell/Syntax/Doc.hs
- compiler/Language/Haskell/Syntax/Expr.hs
- compiler/Language/Haskell/Syntax/Extension.hs
- compiler/Language/Haskell/Syntax/ImpExp.hs
- compiler/Language/Haskell/Syntax/Specificity.hs
- compiler/ghc.cabal.in
- configure.ac
- distrib/configure.ac.in
- docs/users_guide/eventlog-formats.rst
- docs/users_guide/expected-undocumented-flags.txt
- docs/users_guide/exts/rank_polymorphism.rst
- docs/users_guide/exts/static_pointers.rst
- docs/users_guide/exts/strict.rst
- docs/users_guide/separate_compilation.rst
- docs/users_guide/using-warnings.rst
- docs/users_guide/using.rst
- ghc/GHCi/UI.hs
- ghc/GHCi/UI/Monad.hs
- hadrian/bindist/Makefile
- hadrian/cfg/system.config.host.in
- hadrian/cfg/system.config.target.in
- hadrian/src/Hadrian/Builder/Ar.hs
- hadrian/src/Hadrian/Utilities.hs
- hadrian/src/Oracles/Flag.hs
- hadrian/src/Rules/BinaryDist.hs
- hadrian/src/Rules/CabalReinstall.hs
- hadrian/src/Rules/Documentation.hs
- hadrian/src/Rules/Generate.hs
- hadrian/src/Rules/Library.hs
- hadrian/src/Rules/Nofib.hs
- hadrian/src/Rules/Program.hs
- hadrian/src/Rules/Register.hs
- hadrian/src/Rules/Rts.hs
- hadrian/src/Rules/SourceDist.hs
- hadrian/src/Rules/Test.hs
- hadrian/src/Rules/ToolArgs.hs
- hadrian/src/Settings/Packages.hs
- libraries/base/base.cabal.in
- libraries/base/changelog.md
- libraries/base/src/Control/Applicative.hs
- libraries/base/src/Control/Concurrent.hs
- libraries/base/src/Control/Concurrent/Chan.hs
- libraries/base/src/Control/Concurrent/QSem.hs
- libraries/base/src/Control/Concurrent/QSemN.hs
- libraries/base/src/Data/Array/Byte.hs
- libraries/base/src/Data/Bifoldable.hs
- libraries/base/src/Data/Bifoldable1.hs
- libraries/base/src/Data/Bifunctor.hs
- libraries/base/src/Data/Bitraversable.hs
- libraries/base/src/Data/Bool.hs
- libraries/base/src/Data/Complex.hs
- libraries/base/src/Data/Data.hs
- libraries/base/src/Data/Enum.hs
- libraries/base/src/Data/Fixed.hs
- libraries/base/src/Data/Foldable1.hs
- libraries/base/src/Data/Functor/Classes.hs
- libraries/base/src/Data/Functor/Compose.hs
- libraries/base/src/Data/Functor/Contravariant.hs
- libraries/base/src/Data/Functor/Product.hs
- libraries/base/src/Data/Functor/Sum.hs
- libraries/base/src/Data/List.hs
- libraries/base/src/Data/List/NonEmpty.hs
- libraries/base/src/Data/List/NubOrdSet.hs
- libraries/base/src/Data/Semigroup.hs
- libraries/base/src/Data/Version.hs
- libraries/base/src/GHC/Base.hs
- libraries/base/src/GHC/ByteOrder.hs
- + libraries/base/src/GHC/Essentials.hs
- libraries/base/src/GHC/Exts.hs
- libraries/base/src/GHC/Fingerprint.hs
- libraries/base/src/GHC/RTS/Flags.hs
- libraries/base/src/GHC/ResponseFile.hs
- libraries/base/src/GHC/Stack.hs
- libraries/base/src/GHC/Stats.hs
- libraries/base/src/GHC/Weak/Finalize.hs
- libraries/base/src/Numeric.hs
- libraries/base/src/Prelude.hs
- libraries/base/src/System/CPUTime/Posix/ClockGetTime.hsc
- libraries/base/src/System/CPUTime/Posix/RUsage.hsc
- libraries/base/src/System/CPUTime/Posix/Times.hsc
- libraries/base/src/System/CPUTime/Unsupported.hs
- libraries/base/src/System/Console/GetOpt.hs
- libraries/base/src/System/Environment.hs
- libraries/base/src/System/Exit.hs
- libraries/base/src/System/IO.hs
- libraries/base/src/System/IO/OS.hs
- libraries/base/src/System/IO/Unsafe.hs
- libraries/base/src/System/Info.hs
- libraries/base/src/System/Timeout.hs
- libraries/base/src/Text/Printf.hs
- libraries/base/src/Text/Read.hs
- libraries/base/src/Text/Show/Functions.hs
- libraries/binary
- libraries/ghc-experimental/src/Data/Sum/Experimental.hs
- libraries/ghc-experimental/src/Data/Tuple/Experimental.hs
- libraries/ghc-experimental/src/GHC/Profiling/Eras.hs
- libraries/ghc-experimental/src/Prelude/Experimental.hs
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingDisabled.hsc
- libraries/ghc-heap/GHC/Exts/Heap/FFIClosures_ProfilingEnabled.hsc
- libraries/ghc-internal/codepages/MakeTable.hs
- libraries/ghc-internal/ghc-internal.cabal.in
- libraries/ghc-internal/include/RtsIfaceSymbols.h
- libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs
- libraries/ghc-internal/src/GHC/Internal/Arr.hs
- libraries/ghc-internal/src/GHC/Internal/ArrayArray.hs
- libraries/ghc-internal/src/GHC/Internal/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/GMP.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Integer.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/Natural.hs-boot
- libraries/ghc-internal/src/GHC/Internal/Bignum/Primitives.hs
- libraries/ghc-internal/src/GHC/Internal/Bignum/WordArray.hs
- libraries/ghc-internal/src/GHC/Internal/Bits.hs
- libraries/ghc-internal/src/GHC/Internal/ByteOrder.hs
- libraries/ghc-internal/src/GHC/Internal/CString.hs
- libraries/ghc-internal/src/GHC/Internal/Char.hs
- libraries/ghc-internal/src/GHC/Internal/Classes.hs
- libraries/ghc-internal/src/GHC/Internal/Classes/IP.hs
- libraries/ghc-internal/src/GHC/Internal/Clock.hsc
- libraries/ghc-internal/src/GHC/Internal/ClosureTypes.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Bound.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/POSIX.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/POSIX/Const.hsc
- libraries/ghc-internal/src/GHC/Internal/Conc/Signal.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/Sync.hs
- libraries/ghc-internal/src/GHC/Internal/ConsoleHandler.hsc
- libraries/ghc-internal/src/GHC/Internal/Control/Arrow.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Category.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Concurrent/MVar.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Exception/Base.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fail.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Fix.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/IO/Class.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/ST/Lazy/Imp.hs
- libraries/ghc-internal/src/GHC/Internal/Control/Monad/Zip.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Bits.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Coerce.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Data.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Dynamic.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Either.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Foldable.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Function.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Const.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Identity.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Functor/Utils.hs
- libraries/ghc-internal/src/GHC/Internal/Data/IORef.hs
- libraries/ghc-internal/src/GHC/Internal/Data/List.hs
- libraries/ghc-internal/src/GHC/Internal/Data/List/NonEmpty.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Maybe.hs
- libraries/ghc-internal/src/GHC/Internal/Data/Monoid.hs
- libraries/ghc-internal/src/GHC/Internal/Data/NonEmpty.hs
- libraries/ghc-internal/src/GHC/Internal/Data/OldList.hs
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- libraries/ghc-internal/src/GHC/Internal/Data/Proxy.hs
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- libraries/ghc-internal/src/GHC/Internal/Unicode/Char/UnicodeData/SimpleUpperCaseMapping.hs
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- testsuite/tests/perf/should_run/ByteCodeAsm.hs
- testsuite/tests/plugins/all.T
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- testsuite/tests/plugins/defaulting-plugin/DefaultMultiParam.hs
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- testsuite/tests/profiling/should_run/callstack002.stdout
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- testsuite/tests/rename/should_compile/T3103/GHC/Word.hs
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- testsuite/tests/rts/ipe/IpeStats/Fold.hs
- testsuite/tests/rts/linker/all.T
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- testsuite/tests/simd/should_run/doublex2_arith_baseline.stdout
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- testsuite/tests/tcplugins/T26395_Plugin.hs
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- + testsuite/tests/typecheck/should_fail/T26532.hs
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- testsuite/tests/typecheck/should_fail/tcfail072.stderr
- testsuite/tests/typecheck/should_fail/tcfail097.stderr
- testsuite/tests/typecheck/should_fail/tcfail133.stderr
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- testsuite/tests/typecheck/should_run/T22510.stdout
- testsuite/tests/typecheck/should_run/T3731-short.hs
- testsuite/tests/typecheck/should_run/T3731.hs
- testsuite/tests/typecheck/should_run/church.hs
- testsuite/tests/typecheck/should_run/tcrun008.hs
- testsuite/tests/typecheck/should_run/tcrun017.hs
- testsuite/tests/typecheck/should_run/tcrun026.hs
- testsuite/tests/typecheck/should_run/tcrun035.hs
- testsuite/tests/typecheck/should_run/tcrun036.hs
- testsuite/tests/unboxedsums/UbxSumLevPoly.hs
- testsuite/tests/unboxedsums/unboxedsums_unit_tests.hs
- testsuite/tests/warnings/should_compile/DerivingTypeable.stderr
- utils/check-exact/ExactPrint.hs
- utils/check-exact/Utils.hs
- utils/deriveConstants/Main.hs
- utils/genprimopcode/Main.hs
- utils/haddock/haddock-api/src/Haddock.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Hoogle.hs
- utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs
- utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
- utils/haddock/haddock-api/src/Haddock/Convert.hs
- utils/haddock/haddock-api/src/Haddock/GhcUtils.hs
- utils/haddock/haddock-api/src/Haddock/Interface.hs
- utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Create.hs
- utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs
- utils/haddock/haddock-api/src/Haddock/Types.hs
The diff was not included because it is too large.
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/0e2a6606e655f602c15f2cf606547d…
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