Dear Haskellers, I had used some code which worked fine on GHC 6.4 and now it dont compile on GHC 6.6. Can anyone please give me some workarounds and/or explanations about these 2 errors? instance InfoKind a b => InfoKind (Maybe a) b where blank = Nothing check n _ Nothing = ["No info value stored with "++n] check n g (Just a) = check n g a GHC complains that Illegal instance declaration for `InfoKind (Maybe a) b' (the Coverage Condition fails for one of the functional dependencies) In the instance declaration for `InfoKind (Maybe a) b' multiListViewGetTSelections :: MultiListView x () -> IO [x] multiListViewGetTSelections multiListView = do { Just ((model, _) :: (Var [x], x -> String)) <- unsafeObjectGetClientData multiListView ; -- more and more code } GHC complains that A pattern type signature cannot bind scoped type variables `x' unless the pattern has a rigid type context In the pattern: (model, _) :: (Var [x], x -> String) I would really appreciate some help. Best regards Miguel Vilaça