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Improve unification error messages (again) (push to 6.6 branch)
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcMType.lhs
diff --git
a/compiler/typecheck/TcMType.lhs
b/compiler/typecheck/TcMType.lhs
index
23c3381
..
f01d69d
100644
(file)
--- a/
compiler/typecheck/TcMType.lhs
+++ b/
compiler/typecheck/TcMType.lhs
@@
-368,7
+368,8
@@
data LookupTyVarResult -- The result of a lookupTcTyVar call
lookupTcTyVar :: TcTyVar -> TcM LookupTyVarResult
lookupTcTyVar tyvar
lookupTcTyVar :: TcTyVar -> TcM LookupTyVarResult
lookupTcTyVar tyvar
- = case details of
+ = ASSERT( isTcTyVar tyvar )
+ case details of
SkolemTv _ -> return (DoneTv details)
MetaTv _ ref -> do { meta_details <- readMutVar ref
; case meta_details of
SkolemTv _ -> return (DoneTv details)
MetaTv _ ref -> do { meta_details <- readMutVar ref
; case meta_details of