UserTypeCtxt(..), pprUserTypeCtxt,
TcTyVarDetails(..), BoxInfo(..), pprTcTyVarDetails,
MetaDetails(Flexi, Indirect), SkolemInfo(..), pprSkolTvBinding, pprSkolInfo,
- isImmutableTyVar, isSkolemTyVar, isMetaTyVar, isBoxyTyVar, isSigTyVar, isExistentialTyVar,
+ isImmutableTyVar, isSkolemTyVar, isMetaTyVar, isBoxyTyVar,
+ isSigTyVar, isExistentialTyVar, isTyConableTyVar,
metaTvRef,
isFlexi, isIndirect,
---------------------------------
-- Misc type manipulators
- deNoteType, classesOfTheta,
+ deNoteType,
tyClsNamesOfType, tyClsNamesOfDFunHead,
getDFunTyKey,
mkOpenTvSubst, zipOpenTvSubst, zipTopTvSubst, mkTopTvSubst, notElemTvSubst,
getTvSubstEnv, setTvSubstEnv, getTvInScope, extendTvInScope, lookupTyVar,
extendTvSubst, extendTvSubstList, isInScope, mkTvSubst, zipTyEnv,
- substTy, substTys, substTyWith, substTheta, substTyVar, substTyVarBndr,
+ substTy, substTys, substTyWith, substTheta, substTyVar, substTyVars, substTyVarBndr,
isUnLiftedType, -- Source types are always lifted
isUnboxedTupleType, -- Ditto
tcTyVarsOfType, tcTyVarsOfTypes, exactTyVarsOfType, exactTyVarsOfTypes,
pprKind, pprParendKind,
- pprType, pprParendType, pprTyThingCategory,
+ pprType, pprParendType, pprTypeApp, pprTyThingCategory,
pprPred, pprTheta, pprThetaArrow, pprClassPred
) where
%************************************************************************
\begin{code}
-isImmutableTyVar, isSkolemTyVar, isExistentialTyVar, isBoxyTyVar, isMetaTyVar :: TyVar -> Bool
+isImmutableTyVar :: TyVar -> Bool
+
isImmutableTyVar tv
| isTcTyVar tv = isSkolemTyVar tv
| otherwise = True
+isTyConableTyVar, isSkolemTyVar, isExistentialTyVar,
+ isBoxyTyVar, isMetaTyVar :: TcTyVar -> Bool
+
+isTyConableTyVar tv
+ -- True of a meta-type variable tha can be filled in
+ -- with a type constructor application; in particular,
+ -- not a SigTv
+ = ASSERT( isTcTyVar tv)
+ case tcTyVarDetails tv of
+ MetaTv BoxTv _ -> True
+ MetaTv TauTv _ -> True
+ MetaTv (SigTv {}) _ -> False
+ SkolemTv {} -> False
+
isSkolemTyVar tv
= ASSERT( isTcTyVar tv )
case tcTyVarDetails tv of
mkSigmaTy tyvars theta tau = mkForAllTys tyvars (mkPhiTy theta tau)
mkPhiTy :: [PredType] -> Type -> Type
-mkPhiTy theta ty = foldr (\p r -> FunTy (mkPredTy p) r) ty theta
+mkPhiTy theta ty = foldr (\p r -> mkFunTy (mkPredTy p) r) ty theta
\end{code}
@isTauTy@ tests for nested for-alls. It should not be called on a boxy type.
isTauTyCon :: TyCon -> Bool
-- Returns False for type synonyms whose expansion is a polytype
isTauTyCon tc
- | isSynTyCon tc && not (isOpenTyCon tc) = isTauTy (snd (synTyConDefn tc))
- | otherwise = True
+ | isClosedSynTyCon tc = isTauTy (snd (synTyConDefn tc))
+ | otherwise = True
---------------
isBoxyTy :: TcType -> Bool
-- but it doesn't need to be quantified over the Num a dictionary
-- which can be free in g's rhs, and shared by both calls to g
isInheritablePred (ClassP _ _) = True
-isInheritablePred other = False
+isInheritablePred (EqPred _ _) = True
+isInheritablePred other = False
\end{code}
--------------------- Equality predicates ---------------------------------
tyClsNamesOfDFunHead dfun_ty
= case tcSplitSigmaTy dfun_ty of
(tvs,_,head_ty) -> tyClsNamesOfType head_ty
-
-classesOfTheta :: ThetaType -> [Class]
--- Looks just for ClassP things; maybe it should check
-classesOfTheta preds = [ c | ClassP c _ <- preds ]
\end{code}