{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE RecursiveDo #-}
{-# LANGUAGE TupleSections #-}
{-# OPTIONS_GHC -Wno-incomplete-record-updates #-}
module GHC.Tc.Utils.TcMType (
TcTyVar, TcKind, TcType, TcTauType, TcThetaType, TcTyVarSet,
newFlexiTyVar,
newNamedFlexiTyVar,
newFlexiTyVarTy,
newFlexiTyVarTys,
newOpenFlexiTyVar, newOpenFlexiTyVarTy, newOpenTypeKind,
newOpenFlexiFRRTyVar, newOpenFlexiFRRTyVarTy,
newOpenBoxedTypeKind,
newMetaKindVar, newMetaKindVars,
newMetaTyVarTyAtLevel, newConcreteTyVarTyAtLevel, substConcreteTvOrigin,
newAnonMetaTyVar, newConcreteTyVar,
cloneMetaTyVar, cloneMetaTyVarWithInfo,
newCycleBreakerTyVar,
newMultiplicityVar,
readMetaTyVar, writeMetaTyVar, writeMetaTyVarRef,
newTauTvDetailsAtLevel, newMetaDetails, newMetaTyVarName,
isFilledMetaTyVar_maybe, isFilledMetaTyVar, isUnfilledMetaTyVar,
newEvVar, newEvVars, newDict,
newWantedWithLoc, newWanted, newWanteds, cloneWanted, cloneWC, cloneWantedCtEv,
emitWanted, emitWantedEq, emitWantedEvVar, emitWantedEvVars,
emitWantedEqs,
newTcEvBinds, newNoTcEvBinds, addTcEvBind,
emitNewExprHole,
newCoercionHole, newCoercionHoleO, newVanillaCoercionHole,
fillCoercionHole, isFilledCoercionHole,
unpackCoercionHole, unpackCoercionHole_maybe,
checkCoercionHole,
newImplication,
newMetaTyVars, newMetaTyVarX, newMetaTyVarsX, newMetaTyVarBndrsX,
newMetaTyVarTyVarX,
newTyVarTyVar, cloneTyVarTyVar,
newConcreteTyVarX,
newPatTyVar, newSkolemTyVar, newWildCardX,
ExpType(..), ExpSigmaType, ExpRhoType,
mkCheckExpType, newInferExpType, newInferExpTypeFRR,
tcInfer, tcInferFRR,
readExpType, readExpType_maybe, readScaledExpType,
expTypeToType, scaledExpTypeToType,
checkingExpType_maybe, checkingExpType,
inferResultToType, ensureMonoType, promoteTcType,
tcCheckUsage,
defaultTyVar, promoteMetaTyVarTo, promoteTyVarSet,
quantifyTyVars, doNotQuantifyTyVars,
zonkAndSkolemise, skolemiseQuantifiedTyVar,
candidateQTyVarsOfType, candidateQTyVarsOfKind,
candidateQTyVarsOfTypes, candidateQTyVarsOfKinds,
candidateQTyVarsWithBinders,
CandidatesQTvs(..), delCandidates,
candidateKindVars, partitionCandidates,
checkTypeHasFixedRuntimeRep,
mkHsDictLet, mkHsApp,
mkHsAppTy, mkHsCaseAlt,
tcShortCutLit, shortCutLit, hsOverLitName,
conLikeResTy
) where
import GHC.Prelude
import GHC.Hs
import GHC.Platform
import GHC.Driver.DynFlags
import qualified GHC.LanguageExtensions as LangExt
import {-# SOURCE #-} GHC.Tc.Utils.Unify( unifyInvisibleType, tcSubMult )
import GHC.Tc.Types.Origin
import GHC.Tc.Types.Constraint
import GHC.Tc.Types.Evidence
import GHC.Tc.Types.CtLoc( CtLoc, ctLocOrigin )
import GHC.Tc.Utils.Monad
import GHC.Tc.Utils.TcType
import GHC.Tc.Errors.Types
import GHC.Tc.Zonk.Type
import GHC.Tc.Zonk.TcType
import GHC.Builtin.Names
import GHC.Core.ConLike
import GHC.Core.DataCon
import GHC.Core.TyCo.Rep
import GHC.Core.TyCo.Ppr
import GHC.Core.Type
import GHC.Core.TyCon
import GHC.Core.Coercion
import GHC.Core.Class
import GHC.Core.Predicate
import GHC.Core.UsageEnv
import GHC.Types.Var
import GHC.Types.Id as Id
import GHC.Types.Name
import GHC.Types.SourceText
import GHC.Types.Var.Set
import GHC.Builtin.Types
import GHC.Types.Var.Env
import GHC.Types.Unique.Set
import GHC.Types.Basic ( TypeOrKind(..)
, NonStandardDefaultingStrategy(..)
, DefaultingStrategy(..), defaultNonStandardTyVars )
import GHC.Data.FastString
import GHC.Data.Bag
import GHC.Utils.Misc
import GHC.Utils.Outputable
import GHC.Utils.Panic
import GHC.Utils.Constants (debugIsOn)
import Control.Monad
import Data.IORef
import GHC.Data.Maybe
import qualified Data.Semigroup as Semi
import GHC.Types.Name.Reader
newMetaKindVar :: TcM TcKind
newMetaKindVar :: TcM TcType
newMetaKindVar
= do { details <- MetaInfo -> TcM TcTyVarDetails
newMetaDetails MetaInfo
TauTv
; name <- newMetaTyVarName (fsLit "k")
; let kv = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name TcType
liftedTypeKind TcTyVarDetails
details
; traceTc "newMetaKindVar" (ppr kv)
; return (mkTyVarTy kv) }
newMetaKindVars :: Int -> TcM [TcKind]
newMetaKindVars :: Int -> TcM [TcType]
newMetaKindVars Int
n = Int -> TcM TcType -> TcM [TcType]
forall (m :: * -> *) a. Applicative m => Int -> m a -> m [a]
replicateM Int
n TcM TcType
newMetaKindVar
newEvVars :: TcThetaType -> TcM [EvVar]
newEvVars :: [TcType] -> TcM [TcTyVar]
newEvVars [TcType]
theta = (TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar)
-> [TcType] -> TcM [TcTyVar]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall gbl lcl. TcType -> TcRnIf gbl lcl TcTyVar
newEvVar [TcType]
theta
newEvVar :: TcPredType -> TcRnIf gbl lcl EvVar
newEvVar :: forall gbl lcl. TcType -> TcRnIf gbl lcl TcTyVar
newEvVar TcType
ty = do { name <- OccName -> TcRnIf gbl lcl Name
forall gbl lcl. OccName -> TcRnIf gbl lcl Name
newSysName (TcType -> OccName
predTypeOccName TcType
ty)
; return (mkLocalIdOrCoVar name ManyTy ty) }
newWantedWithLoc :: CtLoc -> PredType -> TcM CtEvidence
newWantedWithLoc :: CtLoc -> TcType -> TcM CtEvidence
newWantedWithLoc CtLoc
loc TcType
pty
= do dst <- case TcType -> Pred
classifyPredType TcType
pty of
EqPred {} -> CoercionHole -> TcEvDest
HoleDest (CoercionHole -> TcEvDest)
-> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
-> IOEnv (Env TcGblEnv TcLclEnv) TcEvDest
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> CtLoc -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
newCoercionHole CtLoc
loc TcType
pty
Pred
_ -> TcTyVar -> TcEvDest
EvVarDest (TcTyVar -> TcEvDest)
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcEvDest
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall gbl lcl. TcType -> TcRnIf gbl lcl TcTyVar
newEvVar TcType
pty
return $ CtWanted { ctev_dest = dst
, ctev_pred = pty
, ctev_loc = loc
, ctev_rewriters = emptyRewriterSet }
newWanted :: CtOrigin -> Maybe TypeOrKind -> PredType -> TcM CtEvidence
newWanted :: CtOrigin -> Maybe TypeOrKind -> TcType -> TcM CtEvidence
newWanted CtOrigin
orig Maybe TypeOrKind
t_or_k TcType
pty
= do loc <- CtOrigin -> Maybe TypeOrKind -> TcM CtLoc
getCtLocM CtOrigin
orig Maybe TypeOrKind
t_or_k
newWantedWithLoc loc pty
newWanteds :: CtOrigin -> ThetaType -> TcM [CtEvidence]
newWanteds :: CtOrigin -> [TcType] -> TcM [CtEvidence]
newWanteds CtOrigin
orig = (TcType -> TcM CtEvidence) -> [TcType] -> TcM [CtEvidence]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (CtOrigin -> Maybe TypeOrKind -> TcType -> TcM CtEvidence
newWanted CtOrigin
orig Maybe TypeOrKind
forall a. Maybe a
Nothing)
cloneWantedCtEv :: CtEvidence -> TcM CtEvidence
cloneWantedCtEv :: CtEvidence -> TcM CtEvidence
cloneWantedCtEv ctev :: CtEvidence
ctev@(CtWanted { ctev_pred :: CtEvidence -> TcType
ctev_pred = TcType
pty, ctev_dest :: CtEvidence -> TcEvDest
ctev_dest = HoleDest CoercionHole
_, ctev_loc :: CtEvidence -> CtLoc
ctev_loc = CtLoc
loc })
| TcType -> Bool
isEqPred TcType
pty
= do { co_hole <- CtLoc -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
newCoercionHole CtLoc
loc TcType
pty
; return (ctev { ctev_dest = HoleDest co_hole }) }
| Bool
otherwise
= String -> SDoc -> TcM CtEvidence
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"cloneWantedCtEv" (TcType -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcType
pty)
cloneWantedCtEv CtEvidence
ctev = CtEvidence -> TcM CtEvidence
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CtEvidence
ctev
cloneWanted :: Ct -> TcM Ct
cloneWanted :: Ct -> TcM Ct
cloneWanted Ct
ct = CtEvidence -> Ct
mkNonCanonical (CtEvidence -> Ct) -> TcM CtEvidence -> TcM Ct
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> CtEvidence -> TcM CtEvidence
cloneWantedCtEv (Ct -> CtEvidence
ctEvidence Ct
ct)
cloneWC :: WantedConstraints -> TcM WantedConstraints
cloneWC :: WantedConstraints -> TcM WantedConstraints
cloneWC wc :: WantedConstraints
wc@(WC { wc_simple :: WantedConstraints -> Cts
wc_simple = Cts
simples, wc_impl :: WantedConstraints -> Bag Implication
wc_impl = Bag Implication
implics })
= do { simples' <- (Ct -> TcM Ct) -> Cts -> IOEnv (Env TcGblEnv TcLclEnv) Cts
forall (m :: * -> *) a b.
Monad m =>
(a -> m b) -> Bag a -> m (Bag b)
mapBagM Ct -> TcM Ct
cloneWanted Cts
simples
; implics' <- mapBagM cloneImplication implics
; return (wc { wc_simple = simples', wc_impl = implics' }) }
cloneImplication :: Implication -> TcM Implication
cloneImplication :: Implication -> IOEnv (Env TcGblEnv TcLclEnv) Implication
cloneImplication implic :: Implication
implic@(Implic { ic_binds :: Implication -> EvBindsVar
ic_binds = EvBindsVar
binds, ic_wanted :: Implication -> WantedConstraints
ic_wanted = WantedConstraints
inner_wanted })
= do { binds' <- EvBindsVar -> TcM EvBindsVar
cloneEvBindsVar EvBindsVar
binds
; inner_wanted' <- cloneWC inner_wanted
; return (implic { ic_binds = binds', ic_wanted = inner_wanted' }) }
emitWanted :: CtOrigin -> TcPredType -> TcM EvTerm
emitWanted :: CtOrigin -> TcType -> TcM EvTerm
emitWanted CtOrigin
origin TcType
pty
= do { ev <- CtOrigin -> Maybe TypeOrKind -> TcType -> TcM CtEvidence
newWanted CtOrigin
origin Maybe TypeOrKind
forall a. Maybe a
Nothing TcType
pty
; emitSimple $ mkNonCanonical ev
; return $ ctEvTerm ev }
emitWantedEqs :: CtOrigin -> [(TcType,TcType)] -> TcM ()
emitWantedEqs :: CtOrigin -> [(TcType, TcType)] -> TcRn ()
emitWantedEqs CtOrigin
origin [(TcType, TcType)]
pairs
| [(TcType, TcType)] -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null [(TcType, TcType)]
pairs
= () -> TcRn ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
| Bool
otherwise
= ((TcType, TcType) -> IOEnv (Env TcGblEnv TcLclEnv) Coercion)
-> [(TcType, TcType)] -> TcRn ()
forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ ((TcType -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) Coercion)
-> (TcType, TcType) -> IOEnv (Env TcGblEnv TcLclEnv) Coercion
forall a b c. (a -> b -> c) -> (a, b) -> c
uncurry (CtOrigin
-> TypeOrKind
-> Role
-> TcType
-> TcType
-> IOEnv (Env TcGblEnv TcLclEnv) Coercion
emitWantedEq CtOrigin
origin TypeOrKind
TypeLevel Role
Nominal)) [(TcType, TcType)]
pairs
emitWantedEq :: CtOrigin -> TypeOrKind -> Role -> TcType -> TcType -> TcM Coercion
emitWantedEq :: CtOrigin
-> TypeOrKind
-> Role
-> TcType
-> TcType
-> IOEnv (Env TcGblEnv TcLclEnv) Coercion
emitWantedEq CtOrigin
origin TypeOrKind
t_or_k Role
role TcType
ty1 TcType
ty2
= do { hole <- CtOrigin -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
newCoercionHoleO CtOrigin
origin TcType
pty
; loc <- getCtLocM origin (Just t_or_k)
; emitSimple $ mkNonCanonical $
CtWanted { ctev_pred = pty
, ctev_dest = HoleDest hole
, ctev_loc = loc
, ctev_rewriters = emptyRewriterSet }
; return (HoleCo hole) }
where
pty :: TcType
pty = Role -> TcType -> TcType -> TcType
mkEqPredRole Role
role TcType
ty1 TcType
ty2
emitWantedEvVar :: CtOrigin -> TcPredType -> TcM EvVar
emitWantedEvVar :: CtOrigin -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
emitWantedEvVar CtOrigin
origin TcType
ty
= do { new_cv <- TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall gbl lcl. TcType -> TcRnIf gbl lcl TcTyVar
newEvVar TcType
ty
; loc <- getCtLocM origin Nothing
; let ctev = CtWanted { ctev_pred :: TcType
ctev_pred = TcType
ty
, ctev_dest :: TcEvDest
ctev_dest = TcTyVar -> TcEvDest
EvVarDest TcTyVar
new_cv
, ctev_loc :: CtLoc
ctev_loc = CtLoc
loc
, ctev_rewriters :: RewriterSet
ctev_rewriters = RewriterSet
emptyRewriterSet }
; emitSimple $ mkNonCanonical ctev
; return new_cv }
emitWantedEvVars :: CtOrigin -> [TcPredType] -> TcM [EvVar]
emitWantedEvVars :: CtOrigin -> [TcType] -> TcM [TcTyVar]
emitWantedEvVars CtOrigin
orig = (TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar)
-> [TcType] -> TcM [TcTyVar]
forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
(a -> m b) -> t a -> m (t b)
forall (m :: * -> *) a b. Monad m => (a -> m b) -> [a] -> m [b]
mapM (CtOrigin -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
emitWantedEvVar CtOrigin
orig)
emitNewExprHole :: RdrName
-> Type -> TcM HoleExprRef
emitNewExprHole :: RdrName -> TcType -> TcM HoleExprRef
emitNewExprHole RdrName
occ TcType
ty
= do { u <- TcRnIf TcGblEnv TcLclEnv Unique
forall gbl lcl. TcRnIf gbl lcl Unique
newUnique
; ref <- newTcRef (pprPanic "unfilled unbound-variable evidence" (ppr u))
; let her = TcRef EvTerm -> TcType -> Unique -> HoleExprRef
HER TcRef EvTerm
ref TcType
ty Unique
u
; loc <- getCtLocM (ExprHoleOrigin (Just occ)) (Just TypeLevel)
; let hole = Hole { hole_sort :: HoleSort
hole_sort = HoleExprRef -> HoleSort
ExprHole HoleExprRef
her
, hole_occ :: RdrName
hole_occ = RdrName
occ
, hole_ty :: TcType
hole_ty = TcType
ty
, hole_loc :: CtLoc
hole_loc = CtLoc
loc }
; emitHole hole
; return her }
newDict :: Class -> [TcType] -> TcM DictId
newDict :: Class -> [TcType] -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newDict Class
cls [TcType]
tys
= do { name <- OccName -> TcM Name
forall gbl lcl. OccName -> TcRnIf gbl lcl Name
newSysName (OccName -> OccName
mkDictOcc (Class -> OccName
forall a. NamedThing a => a -> OccName
getOccName Class
cls))
; return (mkLocalId name ManyTy (mkClassPred cls tys)) }
predTypeOccName :: PredType -> OccName
predTypeOccName :: TcType -> OccName
predTypeOccName TcType
ty = case TcType -> Pred
classifyPredType TcType
ty of
ClassPred Class
cls [TcType]
_ -> OccName -> OccName
mkDictOcc (Class -> OccName
forall a. NamedThing a => a -> OccName
getOccName Class
cls)
EqPred {} -> FastString -> OccName
mkVarOccFS (String -> FastString
fsLit String
"co")
IrredPred {} -> FastString -> OccName
mkVarOccFS (String -> FastString
fsLit String
"irred")
ForAllPred {} -> FastString -> OccName
mkVarOccFS (String -> FastString
fsLit String
"df")
newImplication :: TcM Implication
newImplication :: IOEnv (Env TcGblEnv TcLclEnv) Implication
newImplication
= do env <- TcRnIf TcGblEnv TcLclEnv TcLclEnv
forall gbl lcl. TcRnIf gbl lcl lcl
getLclEnv
warn_inaccessible <- woptM Opt_WarnInaccessibleCode
let in_gen_code = TcLclEnv -> Bool
lclEnvInGeneratedCode TcLclEnv
env
return $
(implicationPrototype (mkCtLocEnv env))
{ ic_warn_inaccessible = warn_inaccessible && not in_gen_code }
newVanillaCoercionHole :: TcPredType -> TcM CoercionHole
newVanillaCoercionHole :: TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
newVanillaCoercionHole = Bool -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
new_coercion_hole Bool
False
newCoercionHole :: CtLoc -> TcPredType -> TcM CoercionHole
newCoercionHole :: CtLoc -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
newCoercionHole CtLoc
loc = CtOrigin -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
newCoercionHoleO (CtLoc -> CtOrigin
ctLocOrigin CtLoc
loc)
newCoercionHoleO :: CtOrigin -> TcPredType -> TcM CoercionHole
newCoercionHoleO :: CtOrigin -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
newCoercionHoleO (KindEqOrigin {}) TcType
pty = Bool -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
new_coercion_hole Bool
True TcType
pty
newCoercionHoleO CtOrigin
_ TcType
pty = Bool -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
new_coercion_hole Bool
False TcType
pty
new_coercion_hole :: Bool -> TcPredType -> TcM CoercionHole
new_coercion_hole :: Bool -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) CoercionHole
new_coercion_hole Bool
hetero_kind TcType
pred_ty
= do { co_var <- TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall gbl lcl. TcType -> TcRnIf gbl lcl TcTyVar
newEvVar TcType
pred_ty
; traceTc "New coercion hole:" (ppr co_var <+> dcolon <+> ppr pred_ty)
; ref <- newMutVar Nothing
; return $ CoercionHole { ch_co_var = co_var, ch_ref = ref
, ch_hetero_kind = hetero_kind } }
fillCoercionHole :: CoercionHole -> Coercion -> TcM ()
fillCoercionHole :: CoercionHole -> Coercion -> TcRn ()
fillCoercionHole (CoercionHole { ch_ref :: CoercionHole -> IORef (Maybe Coercion)
ch_ref = IORef (Maybe Coercion)
ref, ch_co_var :: CoercionHole -> TcTyVar
ch_co_var = TcTyVar
cv }) Coercion
co = do
Bool -> TcRn () -> TcRn ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
debugIsOn (TcRn () -> TcRn ()) -> TcRn () -> TcRn ()
forall a b. (a -> b) -> a -> b
$ do
cts <- IORef (Maybe Coercion)
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe Coercion)
forall (m :: * -> *) a. MonadIO m => TcRef a -> m a
readTcRef IORef (Maybe Coercion)
ref
whenIsJust cts $ \Coercion
old_co ->
String -> SDoc -> TcRn ()
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"Filling a filled coercion hole" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
cv SDoc -> SDoc -> SDoc
forall doc. IsDoc doc => doc -> doc -> doc
$$ Coercion -> SDoc
forall a. Outputable a => a -> SDoc
ppr Coercion
co SDoc -> SDoc -> SDoc
forall doc. IsDoc doc => doc -> doc -> doc
$$ Coercion -> SDoc
forall a. Outputable a => a -> SDoc
ppr Coercion
old_co)
String -> SDoc -> TcRn ()
traceTc String
"Filling coercion hole" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
cv SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> String -> SDoc
forall doc. IsLine doc => String -> doc
text String
":=" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> Coercion -> SDoc
forall a. Outputable a => a -> SDoc
ppr Coercion
co)
IORef (Maybe Coercion) -> Maybe Coercion -> TcRn ()
forall (m :: * -> *) a. MonadIO m => TcRef a -> a -> m ()
writeTcRef IORef (Maybe Coercion)
ref (Coercion -> Maybe Coercion
forall a. a -> Maybe a
Just Coercion
co)
newInferExpType :: TcM ExpType
newInferExpType :: TcM ExpType
newInferExpType = Maybe FixedRuntimeRepContext -> TcM ExpType
new_inferExpType Maybe FixedRuntimeRepContext
forall a. Maybe a
Nothing
newInferExpTypeFRR :: FixedRuntimeRepContext -> TcM ExpTypeFRR
newInferExpTypeFRR :: FixedRuntimeRepContext -> TcM ExpType
newInferExpTypeFRR FixedRuntimeRepContext
frr_orig
= do { th_stage <- TcM ThStage
getStage
; if
| Brack _ (TcPending {}) <- th_stage
-> new_inferExpType Nothing
| otherwise
-> new_inferExpType (Just frr_orig) }
new_inferExpType :: Maybe FixedRuntimeRepContext -> TcM ExpType
new_inferExpType :: Maybe FixedRuntimeRepContext -> TcM ExpType
new_inferExpType Maybe FixedRuntimeRepContext
mb_frr_orig
= do { u <- TcRnIf TcGblEnv TcLclEnv Unique
forall gbl lcl. TcRnIf gbl lcl Unique
newUnique
; tclvl <- getTcLevel
; traceTc "newInferExpType" (ppr u <+> ppr tclvl)
; ref <- newMutVar Nothing
; return (Infer (IR { ir_uniq = u, ir_lvl = tclvl
, ir_ref = ref
, ir_frr = mb_frr_orig })) }
readExpType_maybe :: MonadIO m => ExpType -> m (Maybe TcType)
readExpType_maybe :: forall (m :: * -> *). MonadIO m => ExpType -> m (Maybe TcType)
readExpType_maybe (Check TcType
ty) = Maybe TcType -> m (Maybe TcType)
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (TcType -> Maybe TcType
forall a. a -> Maybe a
Just TcType
ty)
readExpType_maybe (Infer (IR { ir_ref :: InferResult -> IORef (Maybe TcType)
ir_ref = IORef (Maybe TcType)
ref})) = IO (Maybe TcType) -> m (Maybe TcType)
forall a. IO a -> m a
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO (Maybe TcType) -> m (Maybe TcType))
-> IO (Maybe TcType) -> m (Maybe TcType)
forall a b. (a -> b) -> a -> b
$ IORef (Maybe TcType) -> IO (Maybe TcType)
forall a. IORef a -> IO a
readIORef IORef (Maybe TcType)
ref
{-# INLINEABLE readExpType_maybe #-}
readScaledExpType :: MonadIO m => Scaled ExpType -> m (Scaled Type)
readScaledExpType :: forall (m :: * -> *).
MonadIO m =>
Scaled ExpType -> m (Scaled TcType)
readScaledExpType (Scaled TcType
m ExpType
exp_ty)
= do { ty <- ExpType -> m TcType
forall (m :: * -> *). MonadIO m => ExpType -> m TcType
readExpType ExpType
exp_ty
; return (Scaled m ty) }
{-# INLINEABLE readScaledExpType #-}
readExpType :: MonadIO m => ExpType -> m TcType
readExpType :: forall (m :: * -> *). MonadIO m => ExpType -> m TcType
readExpType ExpType
exp_ty
= do { mb_ty <- ExpType -> m (Maybe TcType)
forall (m :: * -> *). MonadIO m => ExpType -> m (Maybe TcType)
readExpType_maybe ExpType
exp_ty
; case mb_ty of
Just TcType
ty -> TcType -> m TcType
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return TcType
ty
Maybe TcType
Nothing -> String -> SDoc -> m TcType
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"Unknown expected type" (ExpType -> SDoc
forall a. Outputable a => a -> SDoc
ppr ExpType
exp_ty) }
{-# INLINEABLE readExpType #-}
scaledExpTypeToType :: Scaled ExpType -> TcM (Scaled TcType)
scaledExpTypeToType :: Scaled ExpType -> TcM (Scaled TcType)
scaledExpTypeToType (Scaled TcType
m ExpType
exp_ty)
= do { ty <- ExpType -> TcM TcType
expTypeToType ExpType
exp_ty
; return (Scaled m ty) }
expTypeToType :: ExpType -> TcM TcType
expTypeToType :: ExpType -> TcM TcType
expTypeToType (Check TcType
ty) = TcType -> TcM TcType
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return TcType
ty
expTypeToType (Infer InferResult
inf_res) = InferResult -> TcM TcType
inferResultToType InferResult
inf_res
inferResultToType :: InferResult -> TcM Type
inferResultToType :: InferResult -> TcM TcType
inferResultToType (IR { ir_uniq :: InferResult -> Unique
ir_uniq = Unique
u, ir_lvl :: InferResult -> TcLevel
ir_lvl = TcLevel
tc_lvl
, ir_ref :: InferResult -> IORef (Maybe TcType)
ir_ref = IORef (Maybe TcType)
ref
, ir_frr :: InferResult -> Maybe FixedRuntimeRepContext
ir_frr = Maybe FixedRuntimeRepContext
mb_frr })
= do { mb_inferred_ty <- IORef (Maybe TcType)
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
forall (m :: * -> *) a. MonadIO m => TcRef a -> m a
readTcRef IORef (Maybe TcType)
ref
; tau <- case mb_inferred_ty of
Just TcType
ty -> do { TcType -> TcRn ()
ensureMonoType TcType
ty
; TcType -> TcM TcType
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return TcType
ty }
Maybe TcType
Nothing -> do { tau <- TcM TcType
new_meta
; writeMutVar ref (Just tau)
; return tau }
; traceTc "Forcing ExpType to be monomorphic:"
(ppr u <+> text ":=" <+> ppr tau)
; return tau }
where
new_meta :: TcM TcType
new_meta = case Maybe FixedRuntimeRepContext
mb_frr of
Maybe FixedRuntimeRepContext
Nothing -> do { rr <- TcLevel -> TcType -> TcM TcType
newMetaTyVarTyAtLevel TcLevel
tc_lvl TcType
runtimeRepTy
; newMetaTyVarTyAtLevel tc_lvl (mkTYPEapp rr) }
Just FixedRuntimeRepContext
frr -> mdo { rr <- newConcreteTyVarTyAtLevel conc_orig tc_lvl runtimeRepTy
; tau <- newMetaTyVarTyAtLevel tc_lvl (mkTYPEapp rr)
; let conc_orig = FixedRuntimeRepOrigin -> ConcreteTvOrigin
ConcreteFRR (FixedRuntimeRepOrigin -> ConcreteTvOrigin)
-> FixedRuntimeRepOrigin -> ConcreteTvOrigin
forall a b. (a -> b) -> a -> b
$ TcType -> FixedRuntimeRepContext -> FixedRuntimeRepOrigin
FixedRuntimeRepOrigin TcType
tau FixedRuntimeRepContext
frr
; return tau }
tcInfer :: (ExpSigmaType -> TcM a) -> TcM (a, TcSigmaType)
tcInfer :: forall a. (ExpType -> TcM a) -> TcM (a, TcType)
tcInfer = Maybe FixedRuntimeRepContext
-> (ExpType -> TcM a) -> TcM (a, TcType)
forall a.
Maybe FixedRuntimeRepContext
-> (ExpType -> TcM a) -> TcM (a, TcType)
tc_infer Maybe FixedRuntimeRepContext
forall a. Maybe a
Nothing
tcInferFRR :: FixedRuntimeRepContext -> (ExpSigmaTypeFRR -> TcM a) -> TcM (a, TcSigmaTypeFRR)
tcInferFRR :: forall a.
FixedRuntimeRepContext -> (ExpType -> TcM a) -> TcM (a, TcType)
tcInferFRR FixedRuntimeRepContext
frr_orig = Maybe FixedRuntimeRepContext
-> (ExpType -> TcM a) -> TcM (a, TcType)
forall a.
Maybe FixedRuntimeRepContext
-> (ExpType -> TcM a) -> TcM (a, TcType)
tc_infer (FixedRuntimeRepContext -> Maybe FixedRuntimeRepContext
forall a. a -> Maybe a
Just FixedRuntimeRepContext
frr_orig)
tc_infer :: Maybe FixedRuntimeRepContext -> (ExpSigmaType -> TcM a) -> TcM (a, TcSigmaType)
tc_infer :: forall a.
Maybe FixedRuntimeRepContext
-> (ExpType -> TcM a) -> TcM (a, TcType)
tc_infer Maybe FixedRuntimeRepContext
mb_frr ExpType -> TcM a
tc_check
= do { res_ty <- Maybe FixedRuntimeRepContext -> TcM ExpType
new_inferExpType Maybe FixedRuntimeRepContext
mb_frr
; result <- tc_check res_ty
; res_ty <- readExpType res_ty
; return (result, res_ty) }
ensureMonoType :: TcType -> TcM ()
ensureMonoType :: TcType -> TcRn ()
ensureMonoType TcType
res_ty
| TcType -> Bool
isTauTy TcType
res_ty
= () -> TcRn ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
| Bool
otherwise
= do { mono_ty <- TcM TcType
newOpenFlexiTyVarTy
; _co <- unifyInvisibleType res_ty mono_ty
; return () }
promoteTcType :: TcLevel -> TcType -> TcM (TcCoercionN, TcType)
promoteTcType :: TcLevel -> TcType -> TcM (Coercion, TcType)
promoteTcType TcLevel
dest_lvl TcType
ty
= do { cur_lvl <- TcM TcLevel
getTcLevel
; if (cur_lvl `sameDepthAs` dest_lvl)
then return (mkNomReflCo ty, ty)
else promote_it }
where
promote_it :: TcM (TcCoercion, TcType)
promote_it :: TcM (Coercion, TcType)
promote_it
= do { rr <- TcLevel -> TcType -> TcM TcType
newMetaTyVarTyAtLevel TcLevel
dest_lvl TcType
runtimeRepTy
; prom_ty <- newMetaTyVarTyAtLevel dest_lvl (mkTYPEapp rr)
; co <- unifyInvisibleType ty prom_ty
; return (co, prom_ty) }
newMetaTyVarName :: FastString -> TcM Name
newMetaTyVarName :: FastString -> TcM Name
newMetaTyVarName FastString
str
= OccName -> TcM Name
forall gbl lcl. OccName -> TcRnIf gbl lcl Name
newSysName (FastString -> OccName
mkTyVarOccFS FastString
str)
cloneMetaTyVarName :: Name -> TcM Name
cloneMetaTyVarName :: Name -> TcM Name
cloneMetaTyVarName Name
name
= OccName -> TcM Name
forall gbl lcl. OccName -> TcRnIf gbl lcl Name
newSysName (Name -> OccName
nameOccName Name
name)
metaInfoToTyVarName :: MetaInfo -> FastString
metaInfoToTyVarName :: MetaInfo -> FastString
metaInfoToTyVarName MetaInfo
meta_info =
case MetaInfo
meta_info of
MetaInfo
TauTv -> String -> FastString
fsLit String
"t"
MetaInfo
TyVarTv -> String -> FastString
fsLit String
"a"
MetaInfo
RuntimeUnkTv -> String -> FastString
fsLit String
"r"
MetaInfo
CycleBreakerTv -> String -> FastString
fsLit String
"b"
ConcreteTv {} -> String -> FastString
fsLit String
"c"
newAnonMetaTyVar :: MetaInfo -> Kind -> TcM TcTyVar
newAnonMetaTyVar :: MetaInfo -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newAnonMetaTyVar MetaInfo
mi = FastString
-> MetaInfo -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newNamedAnonMetaTyVar (MetaInfo -> FastString
metaInfoToTyVarName MetaInfo
mi) MetaInfo
mi
newNamedAnonMetaTyVar :: FastString -> MetaInfo -> Kind -> TcM TcTyVar
newNamedAnonMetaTyVar :: FastString
-> MetaInfo -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newNamedAnonMetaTyVar FastString
tyvar_name MetaInfo
meta_info TcType
kind
= do { name <- FastString -> TcM Name
newMetaTyVarName FastString
tyvar_name
; details <- newMetaDetails meta_info
; let tyvar = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name TcType
kind TcTyVarDetails
details
; traceTc "newAnonMetaTyVar" (ppr tyvar)
; return tyvar }
newSkolemTyVar :: SkolemInfo -> Name -> Kind -> TcM TcTyVar
newSkolemTyVar :: SkolemInfo
-> Name -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newSkolemTyVar SkolemInfo
skol_info Name
name TcType
kind
= do { lvl <- TcM TcLevel
getTcLevel
; return (mkTcTyVar name kind (SkolemTv skol_info lvl False)) }
newTyVarTyVar :: Name -> Kind -> TcM TcTyVar
newTyVarTyVar :: Name -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newTyVarTyVar Name
name TcType
kind
= do { details <- MetaInfo -> TcM TcTyVarDetails
newMetaDetails MetaInfo
TyVarTv
; let tyvar = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name TcType
kind TcTyVarDetails
details
; traceTc "newTyVarTyVar" (ppr tyvar)
; return tyvar }
cloneTyVarTyVar :: Name -> Kind -> TcM TcTyVar
cloneTyVarTyVar :: Name -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
cloneTyVarTyVar Name
name TcType
kind
= do { details <- MetaInfo -> TcM TcTyVarDetails
newMetaDetails MetaInfo
TyVarTv
; uniq <- newUnique
; let name' = Name
name Name -> Unique -> Name
`setNameUnique` Unique
uniq
tyvar = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name' TcType
kind TcTyVarDetails
details
; traceTc "cloneTyVarTyVar" (ppr tyvar)
; return tyvar }
newConcreteTyVar :: HasDebugCallStack => ConcreteTvOrigin
-> FastString -> TcKind -> TcM TcTyVar
newConcreteTyVar :: HasDebugCallStack =>
ConcreteTvOrigin
-> FastString -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newConcreteTyVar ConcreteTvOrigin
reason FastString
fs TcType
kind
= Bool
-> SDoc
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (TcType -> Bool
isConcreteType TcType
kind) SDoc
assert_msg (IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar)
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall a b. (a -> b) -> a -> b
$
do { th_stage <- TcM ThStage
getStage
; if
| Brack _ (TcPending {}) <- th_stage
-> newNamedAnonMetaTyVar fs TauTv kind
| otherwise
-> newNamedAnonMetaTyVar fs (ConcreteTv reason) kind }
where
assert_msg :: SDoc
assert_msg = String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"newConcreteTyVar: non-concrete kind" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> TcType -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcType
kind
newPatTyVar :: Name -> Kind -> TcM TcTyVar
newPatTyVar :: Name -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newPatTyVar Name
name TcType
kind
= do { details <- MetaInfo -> TcM TcTyVarDetails
newMetaDetails MetaInfo
TauTv
; uniq <- newUnique
; let name' = Name
name Name -> Unique -> Name
`setNameUnique` Unique
uniq
tyvar = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name' TcType
kind TcTyVarDetails
details
; traceTc "newPatTyVar" (ppr tyvar)
; return tyvar }
cloneAnonMetaTyVar :: MetaInfo -> TyVar -> TcKind -> TcM TcTyVar
cloneAnonMetaTyVar :: MetaInfo
-> TcTyVar -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
cloneAnonMetaTyVar MetaInfo
info TcTyVar
tv TcType
kind
= do { details <- MetaInfo -> TcM TcTyVarDetails
newMetaDetails MetaInfo
info
; name <- cloneMetaTyVarName (tyVarName tv)
; let tyvar = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name TcType
kind TcTyVarDetails
details
; traceTc "cloneAnonMetaTyVar" (ppr tyvar <+> dcolon <+> ppr (tyVarKind tyvar))
; return tyvar }
newCycleBreakerTyVar :: TcKind -> TcM TcTyVar
newCycleBreakerTyVar :: TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newCycleBreakerTyVar TcType
kind
= do { details <- MetaInfo -> TcM TcTyVarDetails
newMetaDetails MetaInfo
CycleBreakerTv
; name <- newMetaTyVarName (fsLit "cbv")
; return (mkTcTyVar name kind details) }
newMetaDetails :: MetaInfo -> TcM TcTyVarDetails
newMetaDetails :: MetaInfo -> TcM TcTyVarDetails
newMetaDetails MetaInfo
info
= do { ref <- MetaDetails -> IOEnv (Env TcGblEnv TcLclEnv) (IORef MetaDetails)
forall a env. a -> IOEnv env (IORef a)
newMutVar MetaDetails
Flexi
; tclvl <- getTcLevel
; return (MetaTv { mtv_info = info
, mtv_ref = ref
, mtv_tclvl = tclvl }) }
newTauTvDetailsAtLevel :: TcLevel -> TcM TcTyVarDetails
newTauTvDetailsAtLevel :: TcLevel -> TcM TcTyVarDetails
newTauTvDetailsAtLevel TcLevel
tclvl
= do { ref <- MetaDetails -> IOEnv (Env TcGblEnv TcLclEnv) (IORef MetaDetails)
forall a env. a -> IOEnv env (IORef a)
newMutVar MetaDetails
Flexi
; return (MetaTv { mtv_info = TauTv
, mtv_ref = ref
, mtv_tclvl = tclvl }) }
newConcreteTvDetailsAtLevel :: ConcreteTvOrigin -> TcLevel -> TcM TcTyVarDetails
newConcreteTvDetailsAtLevel :: ConcreteTvOrigin -> TcLevel -> TcM TcTyVarDetails
newConcreteTvDetailsAtLevel ConcreteTvOrigin
conc_orig TcLevel
tclvl
= do { ref <- MetaDetails -> IOEnv (Env TcGblEnv TcLclEnv) (IORef MetaDetails)
forall a env. a -> IOEnv env (IORef a)
newMutVar MetaDetails
Flexi
; return (MetaTv { mtv_info = ConcreteTv conc_orig
, mtv_ref = ref
, mtv_tclvl = tclvl }) }
cloneMetaTyVar :: TcTyVar -> TcM TcTyVar
cloneMetaTyVar :: TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
cloneMetaTyVar TcTyVar
tv
= Bool
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall a. HasCallStack => Bool -> a -> a
assert (TcTyVar -> Bool
isTcTyVar TcTyVar
tv) (IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar)
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall a b. (a -> b) -> a -> b
$
do { ref <- MetaDetails -> IOEnv (Env TcGblEnv TcLclEnv) (IORef MetaDetails)
forall a env. a -> IOEnv env (IORef a)
newMutVar MetaDetails
Flexi
; name' <- cloneMetaTyVarName (tyVarName tv)
; let details' = case TcTyVar -> TcTyVarDetails
tcTyVarDetails TcTyVar
tv of
details :: TcTyVarDetails
details@(MetaTv {}) -> TcTyVarDetails
details { mtv_ref = ref }
TcTyVarDetails
_ -> String -> SDoc -> TcTyVarDetails
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"cloneMetaTyVar" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv)
tyvar = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name' (TcTyVar -> TcType
tyVarKind TcTyVar
tv) TcTyVarDetails
details'
; traceTc "cloneMetaTyVar" (ppr tyvar)
; return tyvar }
cloneMetaTyVarWithInfo :: MetaInfo -> TcLevel -> TcTyVar -> TcM TcTyVar
cloneMetaTyVarWithInfo :: MetaInfo
-> TcLevel -> TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
cloneMetaTyVarWithInfo MetaInfo
info TcLevel
tc_lvl TcTyVar
tv
= Bool
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall a. HasCallStack => Bool -> a -> a
assert (TcTyVar -> Bool
isTcTyVar TcTyVar
tv) (IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar)
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
forall a b. (a -> b) -> a -> b
$
do { ref <- MetaDetails -> IOEnv (Env TcGblEnv TcLclEnv) (IORef MetaDetails)
forall a env. a -> IOEnv env (IORef a)
newMutVar MetaDetails
Flexi
; name' <- cloneMetaTyVarName (tyVarName tv)
; let details = MetaTv { mtv_info :: MetaInfo
mtv_info = MetaInfo
info
, mtv_ref :: IORef MetaDetails
mtv_ref = IORef MetaDetails
ref
, mtv_tclvl :: TcLevel
mtv_tclvl = TcLevel
tc_lvl }
tyvar = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
name' (TcTyVar -> TcType
tyVarKind TcTyVar
tv) TcTyVarDetails
details
; traceTc "cloneMetaTyVarWithInfo" (ppr tyvar)
; return tyvar }
readMetaTyVar :: MonadIO m => TyVar -> m MetaDetails
readMetaTyVar :: forall (m :: * -> *). MonadIO m => TcTyVar -> m MetaDetails
readMetaTyVar TcTyVar
tyvar = Bool -> SDoc -> m MetaDetails -> m MetaDetails
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (TcTyVar -> Bool
isMetaTyVar TcTyVar
tyvar) (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tyvar) (m MetaDetails -> m MetaDetails) -> m MetaDetails -> m MetaDetails
forall a b. (a -> b) -> a -> b
$
IO MetaDetails -> m MetaDetails
forall a. IO a -> m a
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO MetaDetails -> m MetaDetails)
-> IO MetaDetails -> m MetaDetails
forall a b. (a -> b) -> a -> b
$ IORef MetaDetails -> IO MetaDetails
forall a. IORef a -> IO a
readIORef (TcTyVar -> IORef MetaDetails
metaTyVarRef TcTyVar
tyvar)
{-# SPECIALISE readMetaTyVar :: TyVar -> TcM MetaDetails #-}
{-# SPECIALISE readMetaTyVar :: TyVar -> ZonkM MetaDetails #-}
isFilledMetaTyVar_maybe :: TcTyVar -> TcM (Maybe Type)
isFilledMetaTyVar_maybe :: TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
isFilledMetaTyVar_maybe TcTyVar
tv
| TcTyVar -> Bool
isTcTyVar TcTyVar
tv
, MetaTv { mtv_ref :: TcTyVarDetails -> IORef MetaDetails
mtv_ref = IORef MetaDetails
ref } <- TcTyVar -> TcTyVarDetails
tcTyVarDetails TcTyVar
tv
= do { cts <- IORef MetaDetails -> IOEnv (Env TcGblEnv TcLclEnv) MetaDetails
forall (m :: * -> *) a. MonadIO m => TcRef a -> m a
readTcRef IORef MetaDetails
ref
; case cts of
Indirect TcType
ty -> Maybe TcType -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (TcType -> Maybe TcType
forall a. a -> Maybe a
Just TcType
ty)
MetaDetails
Flexi -> Maybe TcType -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe TcType
forall a. Maybe a
Nothing }
| Bool
otherwise
= Maybe TcType -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe TcType
forall a. Maybe a
Nothing
isFilledMetaTyVar :: TyVar -> TcM Bool
isFilledMetaTyVar :: TcTyVar -> TcRnIf TcGblEnv TcLclEnv Bool
isFilledMetaTyVar TcTyVar
tv = Maybe TcType -> Bool
forall a. Maybe a -> Bool
isJust (Maybe TcType -> Bool)
-> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
-> TcRnIf TcGblEnv TcLclEnv Bool
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
isFilledMetaTyVar_maybe TcTyVar
tv
isUnfilledMetaTyVar :: TyVar -> TcM Bool
isUnfilledMetaTyVar :: TcTyVar -> TcRnIf TcGblEnv TcLclEnv Bool
isUnfilledMetaTyVar TcTyVar
tv
| MetaTv { mtv_ref :: TcTyVarDetails -> IORef MetaDetails
mtv_ref = IORef MetaDetails
ref } <- TcTyVar -> TcTyVarDetails
tcTyVarDetails TcTyVar
tv
= do { details <- IORef MetaDetails -> IOEnv (Env TcGblEnv TcLclEnv) MetaDetails
forall a env. IORef a -> IOEnv env a
readMutVar IORef MetaDetails
ref
; return (isFlexi details) }
| Bool
otherwise = Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
newMultiplicityVar :: TcM TcType
newMultiplicityVar :: TcM TcType
newMultiplicityVar = TcType -> TcM TcType
newFlexiTyVarTy TcType
multiplicityTy
newFlexiTyVar :: Kind -> TcM TcTyVar
newFlexiTyVar :: TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newFlexiTyVar TcType
kind = MetaInfo -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newAnonMetaTyVar MetaInfo
TauTv TcType
kind
newNamedFlexiTyVar :: FastString -> Kind -> TcM TcTyVar
newNamedFlexiTyVar :: FastString -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newNamedFlexiTyVar FastString
fs TcType
kind = FastString
-> MetaInfo -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newNamedAnonMetaTyVar FastString
fs MetaInfo
TauTv TcType
kind
newFlexiTyVarTy :: Kind -> TcM TcType
newFlexiTyVarTy :: TcType -> TcM TcType
newFlexiTyVarTy TcType
kind = do
tc_tyvar <- TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newFlexiTyVar TcType
kind
return (mkTyVarTy tc_tyvar)
newFlexiTyVarTys :: Int -> Kind -> TcM [TcType]
newFlexiTyVarTys :: Int -> TcType -> TcM [TcType]
newFlexiTyVarTys Int
n TcType
kind = Int -> TcM TcType -> TcM [TcType]
forall (m :: * -> *) a. Applicative m => Int -> m a -> m [a]
replicateM Int
n (TcType -> TcM TcType
newFlexiTyVarTy TcType
kind)
newOpenTypeKind :: TcM TcKind
newOpenTypeKind :: TcM TcType
newOpenTypeKind
= do { rr <- TcType -> TcM TcType
newFlexiTyVarTy TcType
runtimeRepTy
; return (mkTYPEapp rr) }
newOpenFlexiTyVarTy :: TcM TcType
newOpenFlexiTyVarTy :: TcM TcType
newOpenFlexiTyVarTy
= do { tv <- IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newOpenFlexiTyVar
; return (mkTyVarTy tv) }
newOpenFlexiTyVar :: TcM TcTyVar
newOpenFlexiTyVar :: IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newOpenFlexiTyVar
= do { kind <- TcM TcType
newOpenTypeKind
; newFlexiTyVar kind }
newOpenFlexiFRRTyVar :: FixedRuntimeRepContext -> TcM TcTyVar
newOpenFlexiFRRTyVar :: FixedRuntimeRepContext -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newOpenFlexiFRRTyVar FixedRuntimeRepContext
frr_ctxt
= do { th_stage <- TcM ThStage
getStage
; case th_stage of
{ Brack ThStage
_ (TcPending {})
-> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newOpenFlexiTyVar
; ThStage
_ ->
mdo { let conc_orig = FixedRuntimeRepOrigin -> ConcreteTvOrigin
ConcreteFRR (FixedRuntimeRepOrigin -> ConcreteTvOrigin)
-> FixedRuntimeRepOrigin -> ConcreteTvOrigin
forall a b. (a -> b) -> a -> b
$
FixedRuntimeRepOrigin
{ frr_context :: FixedRuntimeRepContext
frr_context = FixedRuntimeRepContext
frr_ctxt
, frr_type :: TcType
frr_type = TcTyVar -> TcType
mkTyVarTy TcTyVar
tv }
; rr <- mkTyVarTy <$> newConcreteTyVar conc_orig (fsLit "cx") runtimeRepTy
; tv <- newFlexiTyVar (mkTYPEapp rr)
; return tv } } }
newOpenFlexiFRRTyVarTy :: FixedRuntimeRepContext -> TcM TcType
newOpenFlexiFRRTyVarTy :: FixedRuntimeRepContext -> TcM TcType
newOpenFlexiFRRTyVarTy FixedRuntimeRepContext
frr_ctxt
= do { tv <- FixedRuntimeRepContext -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newOpenFlexiFRRTyVar FixedRuntimeRepContext
frr_ctxt
; return (mkTyVarTy tv) }
newOpenBoxedTypeKind :: TcM TcKind
newOpenBoxedTypeKind :: TcM TcType
newOpenBoxedTypeKind
= do { lev <- TcType -> TcM TcType
newFlexiTyVarTy (TyCon -> TcType
mkTyConTy TyCon
levityTyCon)
; let rr = TyCon -> [TcType] -> TcType
mkTyConApp TyCon
boxedRepDataConTyCon [TcType
lev]
; return (mkTYPEapp rr) }
newMetaTyVars :: [TyVar] -> TcM (Subst, [TcTyVar])
newMetaTyVars :: [TcTyVar] -> TcM (Subst, [TcTyVar])
newMetaTyVars = Subst -> [TcTyVar] -> TcM (Subst, [TcTyVar])
newMetaTyVarsX Subst
emptySubst
newMetaTyVarsX :: Subst -> [TyVar] -> TcM (Subst, [TcTyVar])
newMetaTyVarsX :: Subst -> [TcTyVar] -> TcM (Subst, [TcTyVar])
newMetaTyVarsX Subst
subst = (Subst
-> TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar))
-> Subst -> [TcTyVar] -> TcM (Subst, [TcTyVar])
forall (m :: * -> *) (t :: * -> *) acc x y.
(Monad m, Traversable t) =>
(acc -> x -> m (acc, y)) -> acc -> t x -> m (acc, t y)
mapAccumLM Subst -> TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
newMetaTyVarX Subst
subst
newMetaTyVarBndrsX :: Subst -> [VarBndr TyVar vis] -> TcM (Subst, [VarBndr TcTyVar vis])
newMetaTyVarBndrsX :: forall vis.
Subst
-> [VarBndr TcTyVar vis] -> TcM (Subst, [VarBndr TcTyVar vis])
newMetaTyVarBndrsX Subst
subst [VarBndr TcTyVar vis]
bndrs = do
(subst, bndrs') <- Subst -> [TcTyVar] -> TcM (Subst, [TcTyVar])
newMetaTyVarsX Subst
subst ([VarBndr TcTyVar vis] -> [TcTyVar]
forall tv argf. [VarBndr tv argf] -> [tv]
binderVars [VarBndr TcTyVar vis]
bndrs)
pure (subst, zipWith mkForAllTyBinder flags bndrs')
where
flags :: [vis]
flags = [VarBndr TcTyVar vis] -> [vis]
forall tv argf. [VarBndr tv argf] -> [argf]
binderFlags [VarBndr TcTyVar vis]
bndrs
newMetaTyVarX :: Subst -> TyVar -> TcM (Subst, TcTyVar)
newMetaTyVarX :: Subst -> TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
newMetaTyVarX = MetaInfo
-> Subst
-> TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
new_meta_tv_x MetaInfo
TauTv
newConcreteTyVarX :: ConcreteTvOrigin -> Subst -> TyVar -> TcM (Subst, TcTyVar)
newConcreteTyVarX :: ConcreteTvOrigin
-> Subst
-> TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
newConcreteTyVarX ConcreteTvOrigin
conc Subst
subst TcTyVar
tv
= do { th_stage <- TcM ThStage
getStage
; if
| Brack _ (TcPending {}) <- th_stage
-> new_meta_tv_x TauTv subst tv
| otherwise
-> new_meta_tv_x (ConcreteTv conc) subst tv }
newMetaTyVarTyVarX :: Subst -> TyVar -> TcM (Subst, TcTyVar)
newMetaTyVarTyVarX :: Subst -> TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
newMetaTyVarTyVarX Subst
subst TcTyVar
tv = MetaInfo
-> Subst
-> TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
new_meta_tv_x MetaInfo
TyVarTv Subst
subst TcTyVar
tv
newWildCardX :: Subst -> TyVar -> TcM (Subst, TcTyVar)
newWildCardX :: Subst -> TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
newWildCardX Subst
subst TcTyVar
tv
= do { new_tv <- MetaInfo -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
newAnonMetaTyVar MetaInfo
TauTv (HasDebugCallStack => Subst -> TcType -> TcType
Subst -> TcType -> TcType
substTy Subst
subst (TcTyVar -> TcType
tyVarKind TcTyVar
tv))
; return (extendTvSubstWithClone subst tv new_tv, new_tv) }
new_meta_tv_x :: MetaInfo -> Subst -> TyVar -> TcM (Subst, TcTyVar)
new_meta_tv_x :: MetaInfo
-> Subst
-> TcTyVar
-> IOEnv (Env TcGblEnv TcLclEnv) (Subst, TcTyVar)
new_meta_tv_x MetaInfo
info Subst
subst TcTyVar
tv
= do { new_tv <- MetaInfo
-> TcTyVar -> TcType -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
cloneAnonMetaTyVar MetaInfo
info TcTyVar
tv TcType
substd_kind
; let subst1 = Subst -> TcTyVar -> TcTyVar -> Subst
extendTvSubstWithClone Subst
subst TcTyVar
tv TcTyVar
new_tv
; return (subst1, new_tv) }
where
substd_kind :: TcType
substd_kind = HasDebugCallStack => Subst -> TcType -> TcType
Subst -> TcType -> TcType
substTy Subst
subst (TcTyVar -> TcType
tyVarKind TcTyVar
tv)
newMetaTyVarTyAtLevel :: TcLevel -> TcKind -> TcM TcType
newMetaTyVarTyAtLevel :: TcLevel -> TcType -> TcM TcType
newMetaTyVarTyAtLevel TcLevel
tc_lvl TcType
kind
= do { details <- TcLevel -> TcM TcTyVarDetails
newTauTvDetailsAtLevel TcLevel
tc_lvl
; name <- newMetaTyVarName (fsLit "p")
; return (mkTyVarTy (mkTcTyVar name kind details)) }
newConcreteTyVarTyAtLevel :: ConcreteTvOrigin -> TcLevel -> TcKind -> TcM TcType
newConcreteTyVarTyAtLevel :: ConcreteTvOrigin -> TcLevel -> TcType -> TcM TcType
newConcreteTyVarTyAtLevel ConcreteTvOrigin
conc_orig TcLevel
tc_lvl TcType
kind
= do { details <- ConcreteTvOrigin -> TcLevel -> TcM TcTyVarDetails
newConcreteTvDetailsAtLevel ConcreteTvOrigin
conc_orig TcLevel
tc_lvl
; name <- newMetaTyVarName (fsLit "c")
; return (mkTyVarTy (mkTcTyVar name kind details)) }
substConcreteTvOrigin :: Subst -> Type -> ConcreteTvOrigin -> ConcreteTvOrigin
substConcreteTvOrigin :: Subst -> TcType -> ConcreteTvOrigin -> ConcreteTvOrigin
substConcreteTvOrigin Subst
subst TcType
body_ty (ConcreteFRR FixedRuntimeRepOrigin
frr_orig)
= let subst' :: Subst
subst' = case TcType -> ([TcTyVar], TcType)
splitForAllTyCoVars TcType
body_ty of
([], TcType
_) -> Subst
subst
([TcTyVar]
bndrs, TcType
_) -> (Subst, [TcTyVar]) -> Subst
forall a b. (a, b) -> a
fst ((Subst, [TcTyVar]) -> Subst) -> (Subst, [TcTyVar]) -> Subst
forall a b. (a -> b) -> a -> b
$ HasDebugCallStack => Subst -> [TcTyVar] -> (Subst, [TcTyVar])
Subst -> [TcTyVar] -> (Subst, [TcTyVar])
substTyVarBndrs Subst
subst [TcTyVar]
bndrs
in FixedRuntimeRepOrigin -> ConcreteTvOrigin
ConcreteFRR (FixedRuntimeRepOrigin -> ConcreteTvOrigin)
-> FixedRuntimeRepOrigin -> ConcreteTvOrigin
forall a b. (a -> b) -> a -> b
$ Subst -> FixedRuntimeRepOrigin -> FixedRuntimeRepOrigin
substFRROrigin Subst
subst' FixedRuntimeRepOrigin
frr_orig
substFRROrigin :: Subst -> FixedRuntimeRepOrigin -> FixedRuntimeRepOrigin
substFRROrigin :: Subst -> FixedRuntimeRepOrigin -> FixedRuntimeRepOrigin
substFRROrigin Subst
subst orig :: FixedRuntimeRepOrigin
orig@(FixedRuntimeRepOrigin { frr_type :: FixedRuntimeRepOrigin -> TcType
frr_type = TcType
ty })
= FixedRuntimeRepOrigin
orig { frr_type = substTy subst ty }
data CandidatesQTvs
= DV { CandidatesQTvs -> DTyVarSet
dv_kvs :: DTyVarSet
, CandidatesQTvs -> DTyVarSet
dv_tvs :: DTyVarSet
, CandidatesQTvs -> CoVarSet
dv_cvs :: CoVarSet
}
instance Semi.Semigroup CandidatesQTvs where
(DV { dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
kv1, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
tv1, dv_cvs :: CandidatesQTvs -> CoVarSet
dv_cvs = CoVarSet
cv1 })
<> :: CandidatesQTvs -> CandidatesQTvs -> CandidatesQTvs
<> (DV { dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
kv2, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
tv2, dv_cvs :: CandidatesQTvs -> CoVarSet
dv_cvs = CoVarSet
cv2 })
= DV { dv_kvs :: DTyVarSet
dv_kvs = DTyVarSet
kv1 DTyVarSet -> DTyVarSet -> DTyVarSet
`unionDVarSet` DTyVarSet
kv2
, dv_tvs :: DTyVarSet
dv_tvs = DTyVarSet
tv1 DTyVarSet -> DTyVarSet -> DTyVarSet
`unionDVarSet` DTyVarSet
tv2
, dv_cvs :: CoVarSet
dv_cvs = CoVarSet
cv1 CoVarSet -> CoVarSet -> CoVarSet
`unionVarSet` CoVarSet
cv2 }
instance Monoid CandidatesQTvs where
mempty :: CandidatesQTvs
mempty = DV { dv_kvs :: DTyVarSet
dv_kvs = DTyVarSet
emptyDVarSet, dv_tvs :: DTyVarSet
dv_tvs = DTyVarSet
emptyDVarSet, dv_cvs :: CoVarSet
dv_cvs = CoVarSet
emptyVarSet }
mappend :: CandidatesQTvs -> CandidatesQTvs -> CandidatesQTvs
mappend = CandidatesQTvs -> CandidatesQTvs -> CandidatesQTvs
forall a. Semigroup a => a -> a -> a
(Semi.<>)
instance Outputable CandidatesQTvs where
ppr :: CandidatesQTvs -> SDoc
ppr (DV {dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
kvs, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
tvs, dv_cvs :: CandidatesQTvs -> CoVarSet
dv_cvs = CoVarSet
cvs })
= String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"DV" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc
braces ((SDoc -> SDoc) -> [SDoc] -> SDoc
forall a. (a -> SDoc) -> [a] -> SDoc
pprWithCommas SDoc -> SDoc
forall a. a -> a
id [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"dv_kvs =" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> DTyVarSet -> SDoc
forall a. Outputable a => a -> SDoc
ppr DTyVarSet
kvs
, String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"dv_tvs =" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> DTyVarSet -> SDoc
forall a. Outputable a => a -> SDoc
ppr DTyVarSet
tvs
, String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"dv_cvs =" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> CoVarSet -> SDoc
forall a. Outputable a => a -> SDoc
ppr CoVarSet
cvs ])
isEmptyCandidates :: CandidatesQTvs -> Bool
isEmptyCandidates :: CandidatesQTvs -> Bool
isEmptyCandidates (DV { dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
kvs, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
tvs })
= DTyVarSet -> Bool
isEmptyDVarSet DTyVarSet
kvs Bool -> Bool -> Bool
&& DTyVarSet -> Bool
isEmptyDVarSet DTyVarSet
tvs
candidateVars :: CandidatesQTvs -> ([TcTyVar], [TcTyVar])
candidateVars :: CandidatesQTvs -> ([TcTyVar], [TcTyVar])
candidateVars (DV { dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
dep_kv_set, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
nondep_tkv_set })
= ([TcTyVar]
dep_kvs, [TcTyVar]
nondep_tvs)
where
dep_kvs :: [TcTyVar]
dep_kvs = [TcTyVar] -> [TcTyVar]
scopedSort ([TcTyVar] -> [TcTyVar]) -> [TcTyVar] -> [TcTyVar]
forall a b. (a -> b) -> a -> b
$ DTyVarSet -> [TcTyVar]
dVarSetElems DTyVarSet
dep_kv_set
nondep_tvs :: [TcTyVar]
nondep_tvs = DTyVarSet -> [TcTyVar]
dVarSetElems (DTyVarSet
nondep_tkv_set DTyVarSet -> DTyVarSet -> DTyVarSet
`minusDVarSet` DTyVarSet
dep_kv_set)
candidateKindVars :: CandidatesQTvs -> TyVarSet
candidateKindVars :: CandidatesQTvs -> CoVarSet
candidateKindVars CandidatesQTvs
dvs = DTyVarSet -> CoVarSet
dVarSetToVarSet (CandidatesQTvs -> DTyVarSet
dv_kvs CandidatesQTvs
dvs)
delCandidates :: CandidatesQTvs -> [Var] -> CandidatesQTvs
delCandidates :: CandidatesQTvs -> [TcTyVar] -> CandidatesQTvs
delCandidates (DV { dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
kvs, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
tvs, dv_cvs :: CandidatesQTvs -> CoVarSet
dv_cvs = CoVarSet
cvs }) [TcTyVar]
vars
= DV { dv_kvs :: DTyVarSet
dv_kvs = DTyVarSet
kvs DTyVarSet -> [TcTyVar] -> DTyVarSet
`delDVarSetList` [TcTyVar]
vars
, dv_tvs :: DTyVarSet
dv_tvs = DTyVarSet
tvs DTyVarSet -> [TcTyVar] -> DTyVarSet
`delDVarSetList` [TcTyVar]
vars
, dv_cvs :: CoVarSet
dv_cvs = CoVarSet
cvs CoVarSet -> [TcTyVar] -> CoVarSet
`delVarSetList` [TcTyVar]
vars }
partitionCandidates :: CandidatesQTvs -> (TyVar -> Bool) -> (TyVarSet, CandidatesQTvs)
partitionCandidates :: CandidatesQTvs -> (TcTyVar -> Bool) -> (CoVarSet, CandidatesQTvs)
partitionCandidates dvs :: CandidatesQTvs
dvs@(DV { dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
kvs, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
tvs }) TcTyVar -> Bool
pred
= (CoVarSet
extracted, CandidatesQTvs
dvs { dv_kvs = rest_kvs, dv_tvs = rest_tvs })
where
(DTyVarSet
extracted_kvs, DTyVarSet
rest_kvs) = (TcTyVar -> Bool) -> DTyVarSet -> (DTyVarSet, DTyVarSet)
partitionDVarSet TcTyVar -> Bool
pred DTyVarSet
kvs
(DTyVarSet
extracted_tvs, DTyVarSet
rest_tvs) = (TcTyVar -> Bool) -> DTyVarSet -> (DTyVarSet, DTyVarSet)
partitionDVarSet TcTyVar -> Bool
pred DTyVarSet
tvs
extracted :: CoVarSet
extracted = DTyVarSet -> CoVarSet
dVarSetToVarSet DTyVarSet
extracted_kvs CoVarSet -> CoVarSet -> CoVarSet
`unionVarSet` DTyVarSet -> CoVarSet
dVarSetToVarSet DTyVarSet
extracted_tvs
candidateQTyVarsWithBinders :: [TyVar] -> Type -> TcM CandidatesQTvs
candidateQTyVarsWithBinders :: [TcTyVar] -> TcType -> TcM CandidatesQTvs
candidateQTyVarsWithBinders [TcTyVar]
bound_tvs TcType
ty
= do { kvs <- [TcType] -> TcM CandidatesQTvs
candidateQTyVarsOfKinds ((TcTyVar -> TcType) -> [TcTyVar] -> [TcType]
forall a b. (a -> b) -> [a] -> [b]
map TcTyVar -> TcType
tyVarKind [TcTyVar]
bound_tvs)
; cur_lvl <- getTcLevel
; all_tvs <- collect_cand_qtvs ty False cur_lvl emptyVarSet kvs ty
; return (all_tvs `delCandidates` bound_tvs) }
candidateQTyVarsOfType :: TcType
-> TcM CandidatesQTvs
candidateQTyVarsOfType :: TcType -> TcM CandidatesQTvs
candidateQTyVarsOfType TcType
ty
= do { cur_lvl <- TcM TcLevel
getTcLevel
; collect_cand_qtvs ty False cur_lvl emptyVarSet mempty ty }
candidateQTyVarsOfTypes :: [Type] -> TcM CandidatesQTvs
candidateQTyVarsOfTypes :: [TcType] -> TcM CandidatesQTvs
candidateQTyVarsOfTypes [TcType]
tys
= do { cur_lvl <- TcM TcLevel
getTcLevel
; foldlM (\CandidatesQTvs
acc TcType
ty -> TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
ty Bool
False TcLevel
cur_lvl CoVarSet
emptyVarSet CandidatesQTvs
acc TcType
ty)
mempty tys }
candidateQTyVarsOfKind :: TcKind
-> TcM CandidatesQTvs
candidateQTyVarsOfKind :: TcType -> TcM CandidatesQTvs
candidateQTyVarsOfKind TcType
ty
= do { cur_lvl <- TcM TcLevel
getTcLevel
; collect_cand_qtvs ty True cur_lvl emptyVarSet mempty ty }
candidateQTyVarsOfKinds :: [TcKind]
-> TcM CandidatesQTvs
candidateQTyVarsOfKinds :: [TcType] -> TcM CandidatesQTvs
candidateQTyVarsOfKinds [TcType]
tys
= do { cur_lvl <- TcM TcLevel
getTcLevel
; foldM (\CandidatesQTvs
acc TcType
ty -> TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
ty Bool
True TcLevel
cur_lvl CoVarSet
emptyVarSet CandidatesQTvs
acc TcType
ty)
mempty tys }
collect_cand_qtvs
:: TcType
-> Bool
-> TcLevel
-> VarSet
-> CandidatesQTvs
-> Type
-> TcM CandidatesQTvs
collect_cand_qtvs :: TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
orig_ty Bool
is_dep TcLevel
cur_lvl CoVarSet
bound CandidatesQTvs
dvs TcType
ty
= CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go CandidatesQTvs
dvs TcType
ty
where
is_bound :: TcTyVar -> Bool
is_bound TcTyVar
tv = TcTyVar
tv TcTyVar -> CoVarSet -> Bool
`elemVarSet` CoVarSet
bound
go :: CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go :: CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go CandidatesQTvs
dv (AppTy TcType
t1 TcType
t2) = (CandidatesQTvs -> TcType -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [TcType] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go CandidatesQTvs
dv [TcType
t1, TcType
t2]
go CandidatesQTvs
dv (TyConApp TyCon
tc [TcType]
tys) = CandidatesQTvs -> [TyConBinder] -> [TcType] -> TcM CandidatesQTvs
go_tc_args CandidatesQTvs
dv (TyCon -> [TyConBinder]
tyConBinders TyCon
tc) [TcType]
tys
go CandidatesQTvs
dv (FunTy FunTyFlag
_ TcType
w TcType
arg TcType
res) = (CandidatesQTvs -> TcType -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [TcType] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go CandidatesQTvs
dv [TcType
w, TcType
arg, TcType
res]
go CandidatesQTvs
dv (LitTy {}) = CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
go CandidatesQTvs
dv (CastTy TcType
ty Coercion
co) = do { dv1 <- CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go CandidatesQTvs
dv TcType
ty
; collect_cand_qtvs_co orig_ty cur_lvl bound dv1 co }
go CandidatesQTvs
dv (CoercionTy Coercion
co) = TcType
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> Coercion
-> TcM CandidatesQTvs
collect_cand_qtvs_co TcType
orig_ty TcLevel
cur_lvl CoVarSet
bound CandidatesQTvs
dv Coercion
co
go CandidatesQTvs
dv (TyVarTy TcTyVar
tv)
| TcTyVar -> Bool
is_bound TcTyVar
tv = CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
| Bool
otherwise = do { m_contents <- TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe TcType)
isFilledMetaTyVar_maybe TcTyVar
tv
; case m_contents of
Just TcType
ind_ty -> CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go CandidatesQTvs
dv TcType
ind_ty
Maybe TcType
Nothing -> CandidatesQTvs -> TcTyVar -> TcM CandidatesQTvs
go_tv CandidatesQTvs
dv TcTyVar
tv }
go CandidatesQTvs
dv (ForAllTy (Bndr TcTyVar
tv ForAllTyFlag
_) TcType
ty)
= do { dv1 <- TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
orig_ty Bool
True TcLevel
cur_lvl CoVarSet
bound CandidatesQTvs
dv (TcTyVar -> TcType
tyVarKind TcTyVar
tv)
; collect_cand_qtvs orig_ty is_dep cur_lvl (bound `extendVarSet` tv) dv1 ty }
go_tc_args :: CandidatesQTvs -> [TyConBinder] -> [TcType] -> TcM CandidatesQTvs
go_tc_args CandidatesQTvs
dv (TyConBinder
tc_bndr:[TyConBinder]
tc_bndrs) (TcType
ty:[TcType]
tys)
= do { dv1 <- TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
orig_ty (Bool
is_dep Bool -> Bool -> Bool
|| TyConBinder -> Bool
isNamedTyConBinder TyConBinder
tc_bndr)
TcLevel
cur_lvl CoVarSet
bound CandidatesQTvs
dv TcType
ty
; go_tc_args dv1 tc_bndrs tys }
go_tc_args CandidatesQTvs
dv [TyConBinder]
_bndrs [TcType]
tys
= (CandidatesQTvs -> TcType -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [TcType] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> TcType -> TcM CandidatesQTvs
go CandidatesQTvs
dv [TcType]
tys
go_tv :: CandidatesQTvs -> TcTyVar -> TcM CandidatesQTvs
go_tv dv :: CandidatesQTvs
dv@(DV { dv_kvs :: CandidatesQTvs -> DTyVarSet
dv_kvs = DTyVarSet
kvs, dv_tvs :: CandidatesQTvs -> DTyVarSet
dv_tvs = DTyVarSet
tvs }) TcTyVar
tv
| TcLevel
cur_lvl TcLevel -> TcLevel -> Bool
`deeperThanOrSame` TcTyVar -> TcLevel
tcTyVarLevel TcTyVar
tv
= CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
| case TcTyVar -> TcTyVarDetails
tcTyVarDetails TcTyVar
tv of
SkolemTv SkolemInfo
_ TcLevel
lvl Bool
_ -> TcLevel
lvl TcLevel -> TcLevel -> Bool
`strictlyDeeperThan` TcLevel -> TcLevel
pushTcLevel TcLevel
cur_lvl
TcTyVarDetails
_ -> Bool
False
= CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
| TcTyVar
tv TcTyVar -> DTyVarSet -> Bool
`elemDVarSet` DTyVarSet
kvs
= CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
| Bool -> Bool
not Bool
is_dep
, TcTyVar
tv TcTyVar -> DTyVarSet -> Bool
`elemDVarSet` DTyVarSet
tvs
= CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
| Bool
otherwise
= do { tv_kind <- ZonkM TcType -> TcM TcType
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM TcType -> TcM TcType) -> ZonkM TcType -> TcM TcType
forall a b. (a -> b) -> a -> b
$ TcType -> ZonkM TcType
zonkTcType (TcTyVar -> TcType
tyVarKind TcTyVar
tv)
; let tv_kind_vars = TcType -> CoVarSet
tyCoVarsOfType TcType
tv_kind
; if | intersectsVarSet bound tv_kind_vars
-> do { traceTc "Naughty quantifier" $
vcat [ ppr tv <+> dcolon <+> ppr tv_kind
, text "bound:" <+> pprTyVars (nonDetEltsUniqSet bound)
, text "fvs:" <+> pprTyVars (nonDetEltsUniqSet tv_kind_vars) ]
; let escapees = CoVarSet -> CoVarSet -> CoVarSet
intersectVarSet CoVarSet
bound CoVarSet
tv_kind_vars
; naughtyQuantification orig_ty tv escapees }
| otherwise
-> do { let tv' = TcTyVar
tv TcTyVar -> TcType -> TcTyVar
`setTyVarKind` TcType
tv_kind
dv' | Bool
is_dep = CandidatesQTvs
dv { dv_kvs = kvs `extendDVarSet` tv' }
| Bool
otherwise = CandidatesQTvs
dv { dv_tvs = tvs `extendDVarSet` tv' }
; collect_cand_qtvs orig_ty True cur_lvl bound dv' tv_kind } }
collect_cand_qtvs_co :: TcType
-> TcLevel
-> VarSet
-> CandidatesQTvs -> Coercion
-> TcM CandidatesQTvs
collect_cand_qtvs_co :: TcType
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> Coercion
-> TcM CandidatesQTvs
collect_cand_qtvs_co TcType
orig_ty TcLevel
cur_lvl CoVarSet
bound = CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co
where
go_co :: CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv (Refl TcType
ty) = TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
orig_ty Bool
True TcLevel
cur_lvl CoVarSet
bound CandidatesQTvs
dv TcType
ty
go_co CandidatesQTvs
dv (GRefl Role
_ TcType
ty MCoercionN
mco) = do { dv1 <- TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
orig_ty Bool
True TcLevel
cur_lvl CoVarSet
bound CandidatesQTvs
dv TcType
ty
; go_mco dv1 mco }
go_co CandidatesQTvs
dv (TyConAppCo Role
_ TyCon
_ [Coercion]
cos) = (CandidatesQTvs -> Coercion -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [Coercion] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv [Coercion]
cos
go_co CandidatesQTvs
dv (AppCo Coercion
co1 Coercion
co2) = (CandidatesQTvs -> Coercion -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [Coercion] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv [Coercion
co1, Coercion
co2]
go_co CandidatesQTvs
dv (FunCo Role
_ FunTyFlag
_ FunTyFlag
_ Coercion
w Coercion
co1 Coercion
co2) = (CandidatesQTvs -> Coercion -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [Coercion] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv [Coercion
w, Coercion
co1, Coercion
co2]
go_co CandidatesQTvs
dv (AxiomCo CoAxiomRule
_ [Coercion]
cos) = (CandidatesQTvs -> Coercion -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [Coercion] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv [Coercion]
cos
go_co CandidatesQTvs
dv (UnivCo { uco_lty :: Coercion -> TcType
uco_lty = TcType
t1, uco_rty :: Coercion -> TcType
uco_rty = TcType
t2, uco_deps :: Coercion -> [Coercion]
uco_deps = [Coercion]
deps })
= do { dv1 <- TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
orig_ty Bool
True TcLevel
cur_lvl CoVarSet
bound CandidatesQTvs
dv TcType
t1
; dv2 <- collect_cand_qtvs orig_ty True cur_lvl bound dv1 t2
; foldM go_co dv2 deps }
go_co CandidatesQTvs
dv (SymCo Coercion
co) = CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
co
go_co CandidatesQTvs
dv (TransCo Coercion
co1 Coercion
co2) = (CandidatesQTvs -> Coercion -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [Coercion] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv [Coercion
co1, Coercion
co2]
go_co CandidatesQTvs
dv (SelCo CoSel
_ Coercion
co) = CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
co
go_co CandidatesQTvs
dv (LRCo LeftOrRight
_ Coercion
co) = CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
co
go_co CandidatesQTvs
dv (InstCo Coercion
co1 Coercion
co2) = (CandidatesQTvs -> Coercion -> TcM CandidatesQTvs)
-> CandidatesQTvs -> [Coercion] -> TcM CandidatesQTvs
forall (t :: * -> *) (m :: * -> *) b a.
(Foldable t, Monad m) =>
(b -> a -> m b) -> b -> t a -> m b
foldlM CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv [Coercion
co1, Coercion
co2]
go_co CandidatesQTvs
dv (KindCo Coercion
co) = CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
co
go_co CandidatesQTvs
dv (SubCo Coercion
co) = CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
co
go_co CandidatesQTvs
dv (HoleCo CoercionHole
hole)
= do m_co <- CoercionHole -> IOEnv (Env TcGblEnv TcLclEnv) (Maybe Coercion)
unpackCoercionHole_maybe CoercionHole
hole
case m_co of
Just Coercion
co -> CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
co
Maybe Coercion
Nothing -> CandidatesQTvs -> TcTyVar -> TcM CandidatesQTvs
go_cv CandidatesQTvs
dv (CoercionHole -> TcTyVar
coHoleCoVar CoercionHole
hole)
go_co CandidatesQTvs
dv (CoVarCo TcTyVar
cv) = CandidatesQTvs -> TcTyVar -> TcM CandidatesQTvs
go_cv CandidatesQTvs
dv TcTyVar
cv
go_co CandidatesQTvs
dv (ForAllCo { fco_tcv :: Coercion -> TcTyVar
fco_tcv = TcTyVar
tcv, fco_kind :: Coercion -> Coercion
fco_kind = Coercion
kind_co, fco_body :: Coercion -> Coercion
fco_body = Coercion
co })
= do { dv1 <- CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
kind_co
; collect_cand_qtvs_co orig_ty cur_lvl (bound `extendVarSet` tcv) dv1 co }
go_mco :: CandidatesQTvs -> MCoercionN -> TcM CandidatesQTvs
go_mco CandidatesQTvs
dv MCoercionN
MRefl = CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
go_mco CandidatesQTvs
dv (MCo Coercion
co) = CandidatesQTvs -> Coercion -> TcM CandidatesQTvs
go_co CandidatesQTvs
dv Coercion
co
go_cv :: CandidatesQTvs -> CoVar -> TcM CandidatesQTvs
go_cv :: CandidatesQTvs -> TcTyVar -> TcM CandidatesQTvs
go_cv dv :: CandidatesQTvs
dv@(DV { dv_cvs :: CandidatesQTvs -> CoVarSet
dv_cvs = CoVarSet
cvs }) TcTyVar
cv
| TcTyVar -> Bool
is_bound TcTyVar
cv = CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
| TcTyVar
cv TcTyVar -> CoVarSet -> Bool
`elemVarSet` CoVarSet
cvs = CandidatesQTvs -> TcM CandidatesQTvs
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return CandidatesQTvs
dv
| Bool
otherwise = TcType
-> Bool
-> TcLevel
-> CoVarSet
-> CandidatesQTvs
-> TcType
-> TcM CandidatesQTvs
collect_cand_qtvs TcType
orig_ty Bool
True TcLevel
cur_lvl CoVarSet
bound
(CandidatesQTvs
dv { dv_cvs = cvs `extendVarSet` cv })
(TcTyVar -> TcType
idType TcTyVar
cv)
is_bound :: TcTyVar -> Bool
is_bound TcTyVar
tv = TcTyVar
tv TcTyVar -> CoVarSet -> Bool
`elemVarSet` CoVarSet
bound
quantifyTyVars :: SkolemInfo
-> NonStandardDefaultingStrategy
-> CandidatesQTvs
-> TcM [TcTyVar]
quantifyTyVars :: SkolemInfo
-> NonStandardDefaultingStrategy -> CandidatesQTvs -> TcM [TcTyVar]
quantifyTyVars SkolemInfo
skol_info NonStandardDefaultingStrategy
ns_strat CandidatesQTvs
dvs
| CandidatesQTvs -> Bool
isEmptyCandidates CandidatesQTvs
dvs
= do { String -> SDoc -> TcRn ()
traceTc String
"quantifyTyVars has nothing to quantify" SDoc
forall doc. IsOutput doc => doc
empty
; [TcTyVar] -> TcM [TcTyVar]
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return [] }
| Bool
otherwise
= do { String -> SDoc -> TcRn ()
traceTc String
"quantifyTyVars {"
( [SDoc] -> SDoc
forall doc. IsDoc doc => [doc] -> doc
vcat [ String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"ns_strat =" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> NonStandardDefaultingStrategy -> SDoc
forall a. Outputable a => a -> SDoc
ppr NonStandardDefaultingStrategy
ns_strat
, String -> SDoc
forall doc. IsLine doc => String -> doc
text String
"dvs =" SDoc -> SDoc -> SDoc
forall doc. IsLine doc => doc -> doc -> doc
<+> CandidatesQTvs -> SDoc
forall a. Outputable a => a -> SDoc
ppr CandidatesQTvs
dvs ])
; undefaulted <- NonStandardDefaultingStrategy -> CandidatesQTvs -> TcM [TcTyVar]
defaultTyVars NonStandardDefaultingStrategy
ns_strat CandidatesQTvs
dvs
; final_qtvs <- liftZonkM $ mapMaybeM zonk_quant undefaulted
; traceTc "quantifyTyVars }"
(vcat [ text "undefaulted:" <+> pprTyVars undefaulted
, text "final_qtvs:" <+> pprTyVars final_qtvs ])
; let co_vars = (TcTyVar -> Bool) -> [TcTyVar] -> [TcTyVar]
forall a. (a -> Bool) -> [a] -> [a]
filter TcTyVar -> Bool
isCoVar [TcTyVar]
final_qtvs
; massertPpr (null co_vars) (ppr co_vars)
; return final_qtvs }
where
zonk_quant :: TcTyVar -> ZonkM (Maybe TcTyVar)
zonk_quant TcTyVar
tkv
| Bool -> Bool
not (TcTyVar -> Bool
isTyVar TcTyVar
tkv)
= Maybe TcTyVar -> ZonkM (Maybe TcTyVar)
forall a. a -> ZonkM a
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe TcTyVar
forall a. Maybe a
Nothing
| Bool
otherwise
= TcTyVar -> Maybe TcTyVar
forall a. a -> Maybe a
Just (TcTyVar -> Maybe TcTyVar)
-> ZonkM TcTyVar -> ZonkM (Maybe TcTyVar)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> SkolemInfo -> TcTyVar -> ZonkM TcTyVar
skolemiseQuantifiedTyVar SkolemInfo
skol_info TcTyVar
tkv
zonkAndSkolemise :: SkolemInfo -> TcTyCoVar -> ZonkM TcTyCoVar
zonkAndSkolemise :: SkolemInfo -> TcTyVar -> ZonkM TcTyVar
zonkAndSkolemise SkolemInfo
skol_info TcTyVar
tyvar
| TcTyVar -> Bool
isTyVarTyVar TcTyVar
tyvar
= do { zonked_tyvar <- HasDebugCallStack => TcTyVar -> ZonkM TcTyVar
TcTyVar -> ZonkM TcTyVar
zonkTcTyVarToTcTyVar TcTyVar
tyvar
; skolemiseQuantifiedTyVar skol_info zonked_tyvar }
| Bool
otherwise
= Bool -> SDoc -> ZonkM TcTyVar -> ZonkM TcTyVar
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (TcTyVar -> Bool
isImmutableTyVar TcTyVar
tyvar Bool -> Bool -> Bool
|| TcTyVar -> Bool
isCoVar TcTyVar
tyvar) (TcTyVar -> SDoc
pprTyVar TcTyVar
tyvar) (ZonkM TcTyVar -> ZonkM TcTyVar) -> ZonkM TcTyVar -> ZonkM TcTyVar
forall a b. (a -> b) -> a -> b
$
TcTyVar -> ZonkM TcTyVar
zonkTyCoVarKind TcTyVar
tyvar
skolemiseQuantifiedTyVar :: SkolemInfo -> TcTyVar -> ZonkM TcTyVar
skolemiseQuantifiedTyVar :: SkolemInfo -> TcTyVar -> ZonkM TcTyVar
skolemiseQuantifiedTyVar SkolemInfo
skol_info TcTyVar
tv
= case TcTyVar -> TcTyVarDetails
tcTyVarDetails TcTyVar
tv of
MetaTv {} -> SkolemInfo -> TcTyVar -> ZonkM TcTyVar
skolemiseUnboundMetaTyVar SkolemInfo
skol_info TcTyVar
tv
SkolemTv SkolemInfo
_ TcLevel
lvl Bool
_
-> do { kind <- TcType -> ZonkM TcType
zonkTcType (TcTyVar -> TcType
tyVarKind TcTyVar
tv)
; let details = SkolemInfo -> TcLevel -> Bool -> TcTyVarDetails
SkolemTv SkolemInfo
skol_info TcLevel
lvl Bool
False
name = TcTyVar -> Name
tyVarName TcTyVar
tv
; return (mkTcTyVar name kind details) }
TcTyVarDetails
_other -> String -> SDoc -> ZonkM TcTyVar
forall a. HasCallStack => String -> SDoc -> a
pprPanic String
"skolemiseQuantifiedTyVar" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv)
defaultTyVar :: DefaultingStrategy
-> TcTyVar
-> TcM Bool
defaultTyVar :: DefaultingStrategy -> TcTyVar -> TcRnIf TcGblEnv TcLclEnv Bool
defaultTyVar DefaultingStrategy
def_strat TcTyVar
tv
| Bool -> Bool
not (TcTyVar -> Bool
isMetaTyVar TcTyVar
tv)
Bool -> Bool -> Bool
|| TcTyVar -> Bool
isTyVarTyVar TcTyVar
tv
= Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
| TcTyVar -> Bool
isRuntimeRepVar TcTyVar
tv
, Bool
default_ns_vars
= do { String -> SDoc -> TcRn ()
traceTc String
"Defaulting a RuntimeRep var to LiftedRep" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv)
; ZonkM () -> TcRn ()
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM () -> TcRn ()) -> ZonkM () -> TcRn ()
forall a b. (a -> b) -> a -> b
$ HasDebugCallStack => TcTyVar -> TcType -> ZonkM ()
TcTyVar -> TcType -> ZonkM ()
writeMetaTyVar TcTyVar
tv TcType
liftedRepTy
; Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True }
| TcTyVar -> Bool
isLevityVar TcTyVar
tv
, Bool
default_ns_vars
= do { String -> SDoc -> TcRn ()
traceTc String
"Defaulting a Levity var to Lifted" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv)
; ZonkM () -> TcRn ()
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM () -> TcRn ()) -> ZonkM () -> TcRn ()
forall a b. (a -> b) -> a -> b
$ HasDebugCallStack => TcTyVar -> TcType -> ZonkM ()
TcTyVar -> TcType -> ZonkM ()
writeMetaTyVar TcTyVar
tv TcType
liftedDataConTy
; Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True }
| TcTyVar -> Bool
isMultiplicityVar TcTyVar
tv
, Bool
default_ns_vars
= do { String -> SDoc -> TcRn ()
traceTc String
"Defaulting a Multiplicity var to Many" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv)
; ZonkM () -> TcRn ()
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM () -> TcRn ()) -> ZonkM () -> TcRn ()
forall a b. (a -> b) -> a -> b
$ HasDebugCallStack => TcTyVar -> TcType -> ZonkM ()
TcTyVar -> TcType -> ZonkM ()
writeMetaTyVar TcTyVar
tv TcType
manyDataConTy
; Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True }
| TcTyVar -> Bool
isConcreteTyVar TcTyVar
tv
= do { lvl <- TcM TcLevel
getTcLevel
; _ <- promoteMetaTyVarTo lvl tv
; return True }
| DefaultingStrategy
DefaultKindVars <- DefaultingStrategy
def_strat
= TcTyVar -> TcRnIf TcGblEnv TcLclEnv Bool
default_kind_var TcTyVar
tv
| Bool
otherwise
= Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
where
default_ns_vars :: Bool
default_ns_vars :: Bool
default_ns_vars = DefaultingStrategy -> Bool
defaultNonStandardTyVars DefaultingStrategy
def_strat
default_kind_var :: TyVar -> TcM Bool
default_kind_var :: TcTyVar -> TcRnIf TcGblEnv TcLclEnv Bool
default_kind_var TcTyVar
kv
| TcType -> Bool
isLiftedTypeKind (TcTyVar -> TcType
tyVarKind TcTyVar
kv)
= do { String -> SDoc -> TcRn ()
traceTc String
"Defaulting a kind var to *" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
kv)
; ZonkM () -> TcRn ()
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM () -> TcRn ()) -> ZonkM () -> TcRn ()
forall a b. (a -> b) -> a -> b
$ HasDebugCallStack => TcTyVar -> TcType -> ZonkM ()
TcTyVar -> TcType -> ZonkM ()
writeMetaTyVar TcTyVar
kv TcType
liftedTypeKind
; Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True }
| Bool
otherwise
= do { let (TidyEnv
tidy_env, TcTyVar
kv') = TidyEnv -> TcTyVar -> (TidyEnv, TcTyVar)
tidyFreeTyCoVarX TidyEnv
emptyTidyEnv TcTyVar
kv
; (TidyEnv, TcRnMessage) -> TcRn ()
addErrTcM ((TidyEnv, TcRnMessage) -> TcRn ())
-> (TidyEnv, TcRnMessage) -> TcRn ()
forall a b. (a -> b) -> a -> b
$ (TidyEnv
tidy_env, TcTyVar -> TcType -> TcRnMessage
TcRnCannotDefaultKindVar TcTyVar
kv' (TcTyVar -> TcType
tyVarKind TcTyVar
kv'))
; Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
}
defaultTyVars :: NonStandardDefaultingStrategy
-> CandidatesQTvs
-> TcM [TcTyVar]
defaultTyVars :: NonStandardDefaultingStrategy -> CandidatesQTvs -> TcM [TcTyVar]
defaultTyVars NonStandardDefaultingStrategy
ns_strat CandidatesQTvs
dvs
= do { poly_kinds <- Extension -> TcRnIf TcGblEnv TcLclEnv Bool
forall gbl lcl. Extension -> TcRnIf gbl lcl Bool
xoptM Extension
LangExt.PolyKinds
; let
def_tvs, def_kvs :: DefaultingStrategy
def_tvs = NonStandardDefaultingStrategy -> DefaultingStrategy
NonStandardDefaulting NonStandardDefaultingStrategy
ns_strat
def_kvs | Bool
poly_kinds = DefaultingStrategy
def_tvs
| Bool
otherwise = DefaultingStrategy
DefaultKindVars
; defaulted_kvs <- mapM (defaultTyVar def_kvs) dep_kvs
; defaulted_tvs <- mapM (defaultTyVar def_tvs) nondep_tvs
; let undefaulted_kvs = [ TcTyVar
kv | (TcTyVar
kv, Bool
False) <- [TcTyVar]
dep_kvs [TcTyVar] -> [Bool] -> [(TcTyVar, Bool)]
forall a b. [a] -> [b] -> [(a, b)]
`zip` [Bool]
defaulted_kvs ]
undefaulted_tvs = [ TcTyVar
tv | (TcTyVar
tv, Bool
False) <- [TcTyVar]
nondep_tvs [TcTyVar] -> [Bool] -> [(TcTyVar, Bool)]
forall a b. [a] -> [b] -> [(a, b)]
`zip` [Bool]
defaulted_tvs ]
; return (undefaulted_kvs ++ undefaulted_tvs) }
where
([TcTyVar]
dep_kvs, [TcTyVar]
nondep_tvs) = CandidatesQTvs -> ([TcTyVar], [TcTyVar])
candidateVars CandidatesQTvs
dvs
skolemiseUnboundMetaTyVar :: SkolemInfo -> TcTyVar -> ZonkM TyVar
skolemiseUnboundMetaTyVar :: SkolemInfo -> TcTyVar -> ZonkM TcTyVar
skolemiseUnboundMetaTyVar SkolemInfo
skol_info TcTyVar
tv
= Bool -> SDoc -> ZonkM TcTyVar -> ZonkM TcTyVar
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (TcTyVar -> Bool
isMetaTyVar TcTyVar
tv) (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv) (ZonkM TcTyVar -> ZonkM TcTyVar) -> ZonkM TcTyVar -> ZonkM TcTyVar
forall a b. (a -> b) -> a -> b
$
do { TcTyVar -> ZonkM ()
forall {f :: * -> *}. MonadIO f => TcTyVar -> f ()
check_empty TcTyVar
tv
; ZonkGblEnv { zge_src_span = here, zge_tc_level = tc_lvl }
<- ZonkM ZonkGblEnv
getZonkGblEnv
; kind <- zonkTcType (tyVarKind tv)
; let tv_name = TcTyVar -> Name
tyVarName TcTyVar
tv
final_name | Name -> Bool
isSystemName Name
tv_name
= Unique -> OccName -> SrcSpan -> Name
mkInternalName (Name -> Unique
nameUnique Name
tv_name)
(Name -> OccName
nameOccName Name
tv_name) SrcSpan
here
| Bool
otherwise
= Name
tv_name
details = SkolemInfo -> TcLevel -> Bool -> TcTyVarDetails
SkolemTv SkolemInfo
skol_info (TcLevel -> TcLevel
pushTcLevel TcLevel
tc_lvl) Bool
False
final_tv = Name -> TcType -> TcTyVarDetails -> TcTyVar
mkTcTyVar Name
final_name TcType
kind TcTyVarDetails
details
; traceZonk "Skolemising" (ppr tv <+> text ":=" <+> ppr final_tv)
; writeMetaTyVar tv (mkTyVarTy final_tv)
; return final_tv }
where
check_empty :: TcTyVar -> f ()
check_empty TcTyVar
tv
= Bool -> f () -> f ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
debugIsOn (f () -> f ()) -> f () -> f ()
forall a b. (a -> b) -> a -> b
$
do { cts <- TcTyVar -> f MetaDetails
forall (m :: * -> *). MonadIO m => TcTyVar -> m MetaDetails
readMetaTyVar TcTyVar
tv
; case cts of
MetaDetails
Flexi -> () -> f ()
forall a. a -> f a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
Indirect TcType
ty -> Bool -> String -> SDoc -> f () -> f ()
forall a. HasCallStack => Bool -> String -> SDoc -> a -> a
warnPprTrace Bool
True String
"skolemiseUnboundMetaTyVar" (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv SDoc -> SDoc -> SDoc
forall doc. IsDoc doc => doc -> doc -> doc
$$ TcType -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcType
ty) (f () -> f ()) -> f () -> f ()
forall a b. (a -> b) -> a -> b
$
() -> f ()
forall a. a -> f a
forall (m :: * -> *) a. Monad m => a -> m a
return () }
doNotQuantifyTyVars :: CandidatesQTvs
-> (TidyEnv -> ZonkM (TidyEnv, UninferrableTyVarCtx))
-> TcM ()
doNotQuantifyTyVars :: CandidatesQTvs
-> (TidyEnv -> ZonkM (TidyEnv, UninferrableTyVarCtx)) -> TcRn ()
doNotQuantifyTyVars CandidatesQTvs
dvs TidyEnv -> ZonkM (TidyEnv, UninferrableTyVarCtx)
where_found
| CandidatesQTvs -> Bool
isEmptyCandidates CandidatesQTvs
dvs
= String -> SDoc -> TcRn ()
traceTc String
"doNotQuantifyTyVars has nothing to error on" SDoc
forall doc. IsOutput doc => doc
empty
| Bool
otherwise
= do { String -> SDoc -> TcRn ()
traceTc String
"doNotQuantifyTyVars" (CandidatesQTvs -> SDoc
forall a. Outputable a => a -> SDoc
ppr CandidatesQTvs
dvs)
; undefaulted <- NonStandardDefaultingStrategy -> CandidatesQTvs -> TcM [TcTyVar]
defaultTyVars NonStandardDefaultingStrategy
DefaultNonStandardTyVars CandidatesQTvs
dvs
; let leftover_metas = (TcTyVar -> Bool) -> [TcTyVar] -> [TcTyVar]
forall a. (a -> Bool) -> [a] -> [a]
filter TcTyVar -> Bool
isMetaTyVar [TcTyVar]
undefaulted
; unless (null leftover_metas) $
do { let (tidy_env1, tidied_tvs) = tidyFreeTyCoVarsX emptyTidyEnv leftover_metas
; (tidy_env2, where_doc) <- liftZonkM $ where_found tidy_env1
; let msg = [TcTyVar] -> UninferrableTyVarCtx -> TcRnMessage
TcRnUninferrableTyVar [TcTyVar]
tidied_tvs UninferrableTyVarCtx
where_doc
; failWithTcM (tidy_env2, msg) }
; traceTc "doNotQuantifyTyVars success" empty }
tcCheckUsage :: Name -> Mult -> TcM a -> TcM a
tcCheckUsage :: forall a. Name -> TcType -> TcM a -> TcM a
tcCheckUsage Name
name TcType
id_mult TcM a
thing_inside
= do { (local_usage, result) <- TcM a -> TcM (UsageEnv, a)
forall a. TcM a -> TcM (UsageEnv, a)
tcCollectingUsage TcM a
thing_inside
; check_usage (lookupUE local_usage name)
; tcEmitBindingUsage (deleteUE local_usage name)
; return result }
where
check_usage :: Usage -> TcM ()
check_usage :: Usage -> TcRn ()
check_usage Usage
actual_u
= do { String -> SDoc -> TcRn ()
traceTc String
"check_usage" (TcType -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcType
id_mult SDoc -> SDoc -> SDoc
forall doc. IsDoc doc => doc -> doc -> doc
$$ Usage -> SDoc
forall a. Outputable a => a -> SDoc
ppr Usage
actual_u)
; case Usage
actual_u of
Usage
Bottom -> () -> TcRn ()
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return ()
Usage
Zero -> CtOrigin -> TcType -> TcType -> TcRn ()
tcSubMult (Name -> CtOrigin
UsageEnvironmentOf Name
name) TcType
ManyTy TcType
id_mult
MUsage TcType
m -> do { m <- TcType -> TcM TcType
promote_mult TcType
m
; tcSubMult (UsageEnvironmentOf name) m id_mult } }
promote_mult :: TcType -> TcM TcType
promote_mult TcType
m = do { fvs <- ZonkM CoVarSet -> TcM CoVarSet
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM CoVarSet -> TcM CoVarSet) -> ZonkM CoVarSet -> TcM CoVarSet
forall a b. (a -> b) -> a -> b
$ CoVarSet -> ZonkM CoVarSet
zonkTyCoVarsAndFV (TcType -> CoVarSet
tyCoVarsOfType TcType
m)
; any_promoted <- promoteTyVarSet fvs
; if any_promoted then liftZonkM $ zonkTcType m else return m
}
tcShortCutLit :: HsOverLit GhcRn -> ExpRhoType -> TcM (Maybe (HsOverLit GhcTc))
tcShortCutLit :: HsOverLit GhcRn -> ExpType -> TcM (Maybe (HsOverLit GhcTc))
tcShortCutLit lit :: HsOverLit GhcRn
lit@(OverLit { ol_val :: forall p. HsOverLit p -> OverLitVal
ol_val = OverLitVal
val, ol_ext :: forall p. HsOverLit p -> XOverLit p
ol_ext = OverLitRn Bool
rebindable LIdP GhcRn
_}) ExpType
exp_res_ty
| Bool -> Bool
not Bool
rebindable
, Just TcType
res_ty <- ExpType -> Maybe TcType
checkingExpType_maybe ExpType
exp_res_ty
= do { dflags <- IOEnv (Env TcGblEnv TcLclEnv) DynFlags
forall (m :: * -> *). HasDynFlags m => m DynFlags
getDynFlags
; let platform = DynFlags -> Platform
targetPlatform DynFlags
dflags
; case shortCutLit platform val res_ty of
Just HsExpr GhcTc
expr -> Maybe (HsOverLit GhcTc) -> TcM (Maybe (HsOverLit GhcTc))
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return (Maybe (HsOverLit GhcTc) -> TcM (Maybe (HsOverLit GhcTc)))
-> Maybe (HsOverLit GhcTc) -> TcM (Maybe (HsOverLit GhcTc))
forall a b. (a -> b) -> a -> b
$ HsOverLit GhcTc -> Maybe (HsOverLit GhcTc)
forall a. a -> Maybe a
Just (HsOverLit GhcTc -> Maybe (HsOverLit GhcTc))
-> HsOverLit GhcTc -> Maybe (HsOverLit GhcTc)
forall a b. (a -> b) -> a -> b
$
HsOverLit GhcRn
lit { ol_ext = OverLitTc False expr res_ty }
Maybe (HsExpr GhcTc)
Nothing -> Maybe (HsOverLit GhcTc) -> TcM (Maybe (HsOverLit GhcTc))
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe (HsOverLit GhcTc)
forall a. Maybe a
Nothing }
| Bool
otherwise
= Maybe (HsOverLit GhcTc) -> TcM (Maybe (HsOverLit GhcTc))
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Maybe (HsOverLit GhcTc)
forall a. Maybe a
Nothing
shortCutLit :: Platform -> OverLitVal -> TcType -> Maybe (HsExpr GhcTc)
shortCutLit :: Platform -> OverLitVal -> TcType -> Maybe (HsExpr GhcTc)
shortCutLit Platform
platform OverLitVal
val TcType
res_ty
= case OverLitVal
val of
HsIntegral IntegralLit
int_lit -> IntegralLit -> Maybe (HsExpr GhcTc)
go_integral IntegralLit
int_lit
HsFractional FractionalLit
frac_lit -> FractionalLit -> Maybe (HsExpr GhcTc)
go_fractional FractionalLit
frac_lit
HsIsString SourceText
s FastString
src -> SourceText -> FastString -> Maybe (HsExpr GhcTc)
go_string SourceText
s FastString
src
where
go_integral :: IntegralLit -> Maybe (HsExpr GhcTc)
go_integral int :: IntegralLit
int@(IL SourceText
src Bool
neg Integer
i)
| TcType -> Bool
isIntTy TcType
res_ty Bool -> Bool -> Bool
&& Platform -> Integer -> Bool
platformInIntRange Platform
platform Integer
i
= HsExpr GhcTc -> Maybe (HsExpr GhcTc)
forall a. a -> Maybe a
Just (XLitE GhcTc -> HsLit GhcTc -> HsExpr GhcTc
forall p. XLitE p -> HsLit p -> HsExpr p
HsLit XLitE GhcTc
NoExtField
noExtField (XHsInt GhcTc -> IntegralLit -> HsLit GhcTc
forall x. XHsInt x -> IntegralLit -> HsLit x
HsInt XHsInt GhcTc
NoExtField
noExtField IntegralLit
int))
| TcType -> Bool
isWordTy TcType
res_ty Bool -> Bool -> Bool
&& Platform -> Integer -> Bool
platformInWordRange Platform
platform Integer
i
= HsExpr GhcTc -> Maybe (HsExpr GhcTc)
forall a. a -> Maybe a
Just (DataCon -> HsLit GhcTc -> HsExpr GhcTc
mkLit DataCon
wordDataCon (XHsWordPrim GhcTc -> Integer -> HsLit GhcTc
forall x. XHsWordPrim x -> Integer -> HsLit x
HsWordPrim XHsWordPrim GhcTc
SourceText
src Integer
i))
| TcType -> Bool
isIntegerTy TcType
res_ty
= HsExpr GhcTc -> Maybe (HsExpr GhcTc)
forall a. a -> Maybe a
Just (XLitE GhcTc -> HsLit GhcTc -> HsExpr GhcTc
forall p. XLitE p -> HsLit p -> HsExpr p
HsLit XLitE GhcTc
NoExtField
noExtField (XXLit GhcTc -> HsLit GhcTc
forall x. XXLit x -> HsLit x
XLit (XXLit GhcTc -> HsLit GhcTc) -> XXLit GhcTc -> HsLit GhcTc
forall a b. (a -> b) -> a -> b
$ SourceText -> Integer -> TcType -> HsLitTc
HsInteger SourceText
src Integer
i TcType
res_ty))
| Bool
otherwise
= FractionalLit -> Maybe (HsExpr GhcTc)
go_fractional (Bool -> Integer -> FractionalLit
integralFractionalLit Bool
neg Integer
i)
go_fractional :: FractionalLit -> Maybe (HsExpr GhcTc)
go_fractional FractionalLit
f
| TcType -> Bool
isFloatTy TcType
res_ty Bool -> Bool -> Bool
&& Bool
valueInRange = HsExpr GhcTc -> Maybe (HsExpr GhcTc)
forall a. a -> Maybe a
Just (DataCon -> HsLit GhcTc -> HsExpr GhcTc
mkLit DataCon
floatDataCon (XHsFloatPrim GhcTc -> FractionalLit -> HsLit GhcTc
forall x. XHsFloatPrim x -> FractionalLit -> HsLit x
HsFloatPrim XHsFloatPrim GhcTc
NoExtField
noExtField FractionalLit
f))
| TcType -> Bool
isDoubleTy TcType
res_ty Bool -> Bool -> Bool
&& Bool
valueInRange = HsExpr GhcTc -> Maybe (HsExpr GhcTc)
forall a. a -> Maybe a
Just (DataCon -> HsLit GhcTc -> HsExpr GhcTc
mkLit DataCon
doubleDataCon (XHsDoublePrim GhcTc -> FractionalLit -> HsLit GhcTc
forall x. XHsDoublePrim x -> FractionalLit -> HsLit x
HsDoublePrim XHsDoublePrim GhcTc
NoExtField
noExtField FractionalLit
f))
| Bool
otherwise = Maybe (HsExpr GhcTc)
forall a. Maybe a
Nothing
where
valueInRange :: Bool
valueInRange =
case FractionalLit
f of
FL { fl_exp :: FractionalLit -> Integer
fl_exp = Integer
e } -> (-Integer
100) Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
<= Integer
e Bool -> Bool -> Bool
&& Integer
e Integer -> Integer -> Bool
forall a. Ord a => a -> a -> Bool
<= Integer
100
go_string :: SourceText -> FastString -> Maybe (HsExpr GhcTc)
go_string SourceText
src FastString
s
| TcType -> Bool
isStringTy TcType
res_ty = HsExpr GhcTc -> Maybe (HsExpr GhcTc)
forall a. a -> Maybe a
Just (XLitE GhcTc -> HsLit GhcTc -> HsExpr GhcTc
forall p. XLitE p -> HsLit p -> HsExpr p
HsLit XLitE GhcTc
NoExtField
noExtField (XHsString GhcTc -> FastString -> HsLit GhcTc
forall x. XHsString x -> FastString -> HsLit x
HsString XHsString GhcTc
SourceText
src FastString
s))
| Bool
otherwise = Maybe (HsExpr GhcTc)
forall a. Maybe a
Nothing
mkLit :: DataCon -> HsLit GhcTc -> HsExpr GhcTc
mkLit :: DataCon -> HsLit GhcTc -> HsExpr GhcTc
mkLit DataCon
con HsLit GhcTc
lit = XApp GhcTc -> LHsExpr GhcTc -> LHsExpr GhcTc -> HsExpr GhcTc
forall p. XApp p -> LHsExpr p -> LHsExpr p -> HsExpr p
HsApp XApp GhcTc
NoExtField
noExtField (DataCon -> LHsExpr GhcTc
nlHsDataCon DataCon
con) (HsLit GhcTc -> LHsExpr GhcTc
forall (p :: Pass). HsLit (GhcPass p) -> LHsExpr (GhcPass p)
nlHsLit HsLit GhcTc
lit)
hsOverLitName :: OverLitVal -> Name
hsOverLitName :: OverLitVal -> Name
hsOverLitName (HsIntegral {}) = Name
fromIntegerName
hsOverLitName (HsFractional {}) = Name
fromRationalName
hsOverLitName (HsIsString {}) = Name
fromStringName
promoteMetaTyVarTo :: HasDebugCallStack => TcLevel -> TcTyVar -> TcM Bool
promoteMetaTyVarTo :: HasDebugCallStack =>
TcLevel -> TcTyVar -> TcRnIf TcGblEnv TcLclEnv Bool
promoteMetaTyVarTo TcLevel
tclvl TcTyVar
tv
| Bool -> SDoc -> Bool -> Bool
forall a. HasCallStack => Bool -> SDoc -> a -> a
assertPpr (TcTyVar -> Bool
isMetaTyVar TcTyVar
tv) (TcTyVar -> SDoc
forall a. Outputable a => a -> SDoc
ppr TcTyVar
tv) (Bool -> Bool) -> Bool -> Bool
forall a b. (a -> b) -> a -> b
$
TcTyVar -> TcLevel
tcTyVarLevel TcTyVar
tv TcLevel -> TcLevel -> Bool
`strictlyDeeperThan` TcLevel
tclvl
= do { cloned_tv <- TcTyVar -> IOEnv (Env TcGblEnv TcLclEnv) TcTyVar
cloneMetaTyVar TcTyVar
tv
; let rhs_tv = TcTyVar -> TcLevel -> TcTyVar
setMetaTyVarTcLevel TcTyVar
cloned_tv TcLevel
tclvl
; liftZonkM $ writeMetaTyVar tv (mkTyVarTy rhs_tv)
; traceTc "promoteTyVar" (ppr tv <+> text "-->" <+> ppr rhs_tv)
; return True }
| Bool
otherwise
= Bool -> TcRnIf TcGblEnv TcLclEnv Bool
forall a. a -> IOEnv (Env TcGblEnv TcLclEnv) a
forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
promoteTyVarSet :: HasDebugCallStack => TcTyVarSet -> TcM Bool
promoteTyVarSet :: HasDebugCallStack => CoVarSet -> TcRnIf TcGblEnv TcLclEnv Bool
promoteTyVarSet CoVarSet
tvs
= do { tclvl <- TcM TcLevel
getTcLevel
; bools <- mapM (promoteMetaTyVarTo tclvl) $
filter isPromotableMetaTyVar $
nonDetEltsUniqSet tvs
; return (or bools) }
checkTypeHasFixedRuntimeRep :: FixedRuntimeRepProvenance -> Type -> TcM ()
checkTypeHasFixedRuntimeRep :: FixedRuntimeRepProvenance -> TcType -> TcRn ()
checkTypeHasFixedRuntimeRep FixedRuntimeRepProvenance
prov TcType
ty =
Bool -> TcRn () -> TcRn ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless (HasDebugCallStack => TcType -> Bool
TcType -> Bool
typeHasFixedRuntimeRep TcType
ty)
((ErrInfo -> TcRnMessage) -> TcRn ()
addDetailedDiagnostic ((ErrInfo -> TcRnMessage) -> TcRn ())
-> (ErrInfo -> TcRnMessage) -> TcRn ()
forall a b. (a -> b) -> a -> b
$ TcType -> FixedRuntimeRepProvenance -> ErrInfo -> TcRnMessage
TcRnTypeDoesNotHaveFixedRuntimeRep TcType
ty FixedRuntimeRepProvenance
prov)
naughtyQuantification :: TcType
-> TcTyVar
-> TyVarSet
-> TcM a
naughtyQuantification :: forall a. TcType -> TcTyVar -> CoVarSet -> TcM a
naughtyQuantification TcType
orig_ty TcTyVar
tv CoVarSet
escapees
= do { (orig_ty1, escapees') <- ZonkM (TcType, [TcTyVar]) -> TcM (TcType, [TcTyVar])
forall a. ZonkM a -> TcM a
liftZonkM (ZonkM (TcType, [TcTyVar]) -> TcM (TcType, [TcTyVar]))
-> ZonkM (TcType, [TcTyVar]) -> TcM (TcType, [TcTyVar])
forall a b. (a -> b) -> a -> b
$
do { orig_ty1 <- TcType -> ZonkM TcType
zonkTcType TcType
orig_ty
; escapees' <- zonkTcTyVarsToTcTyVars $
nonDetEltsUniqSet escapees
; return (orig_ty1, escapees') }
; let fvs = TcType -> [TcTyVar]
tyCoVarsOfTypeList TcType
orig_ty1
env0 = TidyEnv -> [TcTyVar] -> TidyEnv
tidyFreeTyCoVars TidyEnv
emptyTidyEnv [TcTyVar]
fvs
env = TidyEnv
env0 TidyEnv -> [TcTyVar] -> TidyEnv
`delTidyEnvList` [TcTyVar]
escapees'
orig_ty' = TidyEnv -> TcType -> TcType
tidyType TidyEnv
env TcType
orig_ty1
tidied = (TcTyVar -> TcTyVar) -> [TcTyVar] -> [TcTyVar]
forall a b. (a -> b) -> [a] -> [b]
map (TidyEnv -> TcTyVar -> TcTyVar
tidyTyCoVarOcc TidyEnv
env) [TcTyVar]
escapees'
msg = [TcTyVar] -> TcTyVar -> TcType -> TcRnMessage
TcRnSkolemEscape [TcTyVar]
tidied (TidyEnv -> TcTyVar -> TcTyVar
tidyTyCoVarOcc TidyEnv
env TcTyVar
tv) TcType
orig_ty'
; failWithTcM (env, msg) }