add -fsimpleopt-before-flatten

[ghc-hetmet.git] / compiler / iface / BuildTyCl.lhs

diff --git a/compiler/iface/BuildTyCl.lhs b/compiler/iface/BuildTyCl.lhs
index 4319d1f..e71eefe 100644 (file)
--- a/compiler/iface/BuildTyCl.lhs
+++ b/compiler/iface/BuildTyCl.lhs
@@ -112,10 +112,14 @@ mkDataTyConRhs :: [DataCon] -> AlgTyConRhs
 mkDataTyConRhs cons
   = DataTyCon {
         data_cons = cons,
-        is_enum = not (null cons) &&
-                  all isNullarySrcDataCon cons
+        is_enum = not (null cons) && all is_enum_con cons
                  -- See Note [Enumeration types] in TyCon
     }
+  where
+    is_enum_con con
+       | (_tvs, theta, arg_tys, _res) <- dataConSig con
+       = null theta && null arg_tys
+
 
 mkNewTyConRhs :: Name -> TyCon -> DataCon -> TcRnIf m n AlgTyConRhs
 -- ^ Monadic because it makes a Name for the coercion TyCon