tyVarsOfInst :: Inst -> TcTyVarSet
tyVarsOfInst (LitInst {tci_ty = ty}) = tyVarsOfType ty
tyVarsOfInst (Dict {tci_pred = pred}) = tyVarsOfPred pred
-tyVarsOfInst (Method {tci_oid = id, tci_tys = tys}) = tyVarsOfTypes tys `unionVarSet` idFreeTyVars id
+tyVarsOfInst (Method {tci_oid = id, tci_tys = tys}) = tyVarsOfTypes tys `unionVarSet` varTypeTyVars id
-- The id might have free type variables; in the case of
-- locally-overloaded class methods, for example
tyVarsOfInst (ImplicInst {tci_tyvars = tvs, tci_given = givens, tci_wanted = wanteds})
- = (tyVarsOfInsts givens `unionVarSet` tyVarsOfInsts wanteds) `minusVarSet` mkVarSet tvs
-
+ = (tyVarsOfInsts givens `unionVarSet` tyVarsOfInsts wanteds)
+ `minusVarSet` mkVarSet tvs
+ `unionVarSet` unionVarSets (map varTypeTyVars tvs)
+ -- Remember the free tyvars of a coercion
tyVarsOfInsts insts = foldr (unionVarSet . tyVarsOfInst) emptyVarSet insts
tyVarsOfLIE lie = tyVarsOfInsts (lieToList lie)
IParam ip _ -> getOccName (ipNameName ip)
EqPred ty _ -> mkEqPredCoOcc baseOcc
where
- -- we use the outermost tycon of the lhs, which must be a type
- -- function, as the base name for an equality
+ -- we use the outermost tycon of the lhs, if there is one, to
+ -- improve readability of Core code
baseOcc = case splitTyConApp_maybe ty of
- Nothing ->
- pprPanic "Inst.mkPredName:" (ppr ty)
+ Nothing -> mkOccName tcName "$"
Just (tc, _) -> getOccName tc
\end{code}
(theta, _) = tcSplitPhiTy dfun_rho
src_loc = instLocSpan loc
dfun = HsVar dfun_id
- tys = map (substTyVar tenv') tyvars
+ tys = substTyVars tenv' tyvars
; if null theta then
returnM (GenInst [] (L src_loc $ HsWrap (mkWpTyApps tys) dfun))
else do