Merge branch 'master' of http://darcs.haskell.org/ghc into ghc-generics

[ghc-hetmet.git] / compiler / types / Type.lhs

diff --git a/compiler/types/Type.lhs b/compiler/types/Type.lhs
index 3a8675e..995d7a9 100644 (file)
--- a/compiler/types/Type.lhs
+++ b/compiler/types/Type.lhs
@@ -979,9 +979,9 @@ isAlgType ty
 isClosedAlgType :: Type -> Bool
 isClosedAlgType ty
   = case splitTyConApp_maybe ty of
-      Just (tc, ty_args) -> ASSERT( ty_args `lengthIs` tyConArity tc )
-                           isAlgTyCon tc && not (isFamilyTyCon tc)
-      _other            -> False
+      Just (tc, ty_args) | isAlgTyCon tc && not (isFamilyTyCon tc)
+             -> ASSERT2( ty_args `lengthIs` tyConArity tc, ppr ty ) True
+      _other -> False
 \end{code}
 
 \begin{code}