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{-# LANGUAGE MultiParamTypeClasses, FlexibleContexts #-}
-- We want to get the type
-- g :: forall a b c. C a (b,c) => a -> b
--but GHC 6.0 bogusly gets
-- g :: forall a b. C a (b,()) => a -> b
-- Having done this, we reject f on the grounds
-- that its type is ambiguous: adding the type
-- signature g :: C a (b,c) => a -> b
-- would fail
module ShouldFail where
class C a b where { op :: a -> b }
g x = fst (op x)
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