ghc-7.7.20130829: The GHC API

Safe HaskellNone

Unify

Documentation

tcMatchTy :: TyVarSet -> Type -> Type -> Maybe TvSubstSource

tcMatchTys :: TyVarSet -> [Type] -> [Type] -> Maybe TvSubstSource

tcMatchTyX :: TyVarSet -> TvSubst -> Type -> Type -> Maybe TvSubstSource

ruleMatchTyX :: MatchEnv -> TvSubstEnv -> Type -> Type -> Maybe TvSubstEnvSource

tcMatchPreds :: [TyVar] -> [PredType] -> [PredType] -> Maybe TvSubstEnvSource

data MatchEnv Source

Constructors

ME 

Fields

me_tmpls :: VarSet
 
me_env :: RnEnv2
 

matchList :: (env -> a -> b -> Maybe env) -> env -> [a] -> [b] -> Maybe envSource

typesCantMatch :: [(Type, Type)] -> BoolSource

tcUnifyTys :: (TyVar -> BindFlag) -> [Type] -> [Type] -> Maybe TvSubstSource

data BindFlag Source

Constructors

BindMe 
Skolem 

niFixTvSubst :: TvSubstEnv -> TvSubstSource

niSubstTvSet :: TvSubstEnv -> TyVarSet -> TyVarSetSource

data UnifyResultM a Source

Constructors

Unifiable a 
MaybeApart a 
SurelyApart 

type UnifyResult = UnifyResultM TvSubstSource

tcUnifyTysFG :: (TyVar -> BindFlag) -> [Type] -> [Type] -> UnifyResultSource