Re-enable assertion now the new type checker is in

(See Trac #3011.)

diff --git a/compiler/typecheck/TcMType.lhs b/compiler/typecheck/TcMType.lhs
index 9d74ff8..7453334 100644 (file)
--- a/compiler/typecheck/TcMType.lhs
+++ b/compiler/typecheck/TcMType.lhs
@@ -364,8 +364,8 @@ writeMetaTyVarRef tyvar ref ty
 
   | otherwise
   = do { meta_details <- readMutVar ref; 
-       ; WARN( not (isFlexi meta_details), 
-                hang (text "Double update of meta tyvar")
+       ; ASSERT2( isFlexi meta_details, 
+                  hang (text "Double update of meta tyvar")
                    2 (ppr tyvar $$ ppr meta_details) )
 
          traceTc "writeMetaTyVar" (ppr tyvar <+> text ":=" <+> ppr ty)