import CoreFVs ( exprFreeVars )
import TypeRep ( Type(..), TyNote(..) ) -- friend
import Type ( ThetaType, SourceType(..), PredType,
- tyVarsOfType, tyVarsOfTypes, mkAppTy, mkUTy, isUTy
+ tyVarsOfType, tyVarsOfTypes, mkAppTy,
)
import VarSet
import VarEnv
zapSubstEnv (Subst in_scope env) = Subst in_scope emptySubstEnv
extendSubst :: Subst -> Var -> SubstResult -> Subst
-extendSubst (Subst in_scope env) v r = UASSERT( case r of { DoneTy ty -> not (isUTy ty) ; _ -> True } )
- Subst in_scope (extendSubstEnv env v r)
+extendSubst (Subst in_scope env) v r = Subst in_scope (extendSubstEnv env v r)
extendSubstList :: Subst -> [Var] -> [SubstResult] -> Subst
-extendSubstList (Subst in_scope env) v r = UASSERT( all (\ r1 -> case r1 of { DoneTy ty -> not (isUTy ty) ; _ -> True }) r )
- Subst in_scope (extendSubstEnvList env v r)
+extendSubstList (Subst in_scope env) v r = Subst in_scope (extendSubstEnvList env v r)
lookupSubst :: Subst -> Var -> Maybe SubstResult
lookupSubst (Subst _ env) v = lookupSubstEnv env v
go (ForAllTy tv ty) = case substTyVar subst tv of
(subst', tv') -> ForAllTy tv' $! (subst_ty subst' ty)
-
- go (UsageTy u ty) = mkUTy (go u) $! (go ty)
\end{code}
Here is where we invent a new binder if necessary.