Big tidy-up of deriving code

[ghc-hetmet.git] / compiler / basicTypes / DataCon.lhs

diff --git a/compiler/basicTypes/DataCon.lhs b/compiler/basicTypes/DataCon.lhs
index d7a7e2a..0fb7fae 100644 (file)
--- a/compiler/basicTypes/DataCon.lhs
+++ b/compiler/basicTypes/DataCon.lhs
@@ -619,7 +619,7 @@ dataConUserType  (MkData { dcUnivTyVars = univ_tvs,
     mkFunTys (mkPredTys theta) $
     mkFunTys arg_tys $
     case tyConFamInst_maybe tycon of
-      Nothing             -> mkTyConApp tycon (map (substTyVar subst) univ_tvs)
+      Nothing             -> mkTyConApp tycon (substTyVars subst univ_tvs)
       Just (ftc, insttys) -> mkTyConApp ftc insttys        -- data instance
   where
     subst = mkTopTvSubst eq_spec