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Fix Trac #2414: occurrs check was missed
[ghc-hetmet.git]
/
compiler
/
typecheck
/
TcTyClsDecls.lhs
diff --git
a/compiler/typecheck/TcTyClsDecls.lhs
b/compiler/typecheck/TcTyClsDecls.lhs
index
fa10fbf
..
635fef9
100644
(file)
--- a/
compiler/typecheck/TcTyClsDecls.lhs
+++ b/
compiler/typecheck/TcTyClsDecls.lhs
@@
-224,6
+224,10
@@
mkGlobalThings decls things
= (name, AClass cl)
mk_thing (L _ decl, ~(ATyCon tc))
= (tcdName decl, ATyCon tc)
+#if __GLASGOW_HASKELL__ < 605
+-- Old GHCs don't understand that ~... matches anything
+ mk_thing _ = panic "mkGlobalThings: Can't happen"
+#endif
\end{code}