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Fix Trac #5084
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcMType.lhs
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;
| 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 $$ ppr meta_details) )
traceTc "writeMetaTyVar" (ppr tyvar <+> text ":=" <+> ppr ty)
2 (ppr tyvar $$ ppr meta_details) )
traceTc "writeMetaTyVar" (ppr tyvar <+> text ":=" <+> ppr ty)