-- | Returns the instantiated type scheme ty', and the
-- mapping from new (instantiated) -to- old (skolem) type variables
--- We want this mapping just for old RuntimeUnkSkols, to avoid
--- gratuitously changing their unique on every trip
instScheme :: QuantifiedType -> TR (TcType, RttiInstantiation)
instScheme (tvs, ty)
= liftTcM $ do { (tvs', _, subst) <- tcInstTyVars tvs
- ; let rtti_inst = [(tv',tv) | (tv',tv) <- tvs' `zip` tvs
- , isRuntimeUnkSkol tv]
+ ; let rtti_inst = [(tv',tv) | (tv',tv) <- tvs' `zip` tvs]
; return (substTy subst ty, rtti_inst) }
applyRevSubst :: RttiInstantiation -> TR ()
where
zonk_unbound_meta tv
= ASSERT( isTcTyVar tv )
- do { tv' <- skolemiseUnboundMetaTyVar RuntimeUnkSkol tv
+ do { tv' <- skolemiseUnboundMetaTyVar tv RuntimeUnk
-- This is where RuntimeUnkSkols are born:
-- otherwise-unconstrained unification variables are
-- turned into RuntimeUnkSkols as they leave the