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{-# LANGUAGE Rank2Types #-}
-- These ones failed with 5.04. They need a coercion
-- in the pattern matching compiler, so they are a bit
-- tricky.
-- GHC 6.3: these are back to failures, because we no longer do
-- type subsumption in pattern-matching
-- GHC 7.0: back to success
module ShouldCompile where
newtype Bug s a = Bug a
runBug :: (forall s. Bug s a) -> a
runBug (Bug _) = undefined
newtype BugN s a = BugN a
runBugN :: (forall s. BugN s a) -> a
runBugN (BugN _) = undefined
data Foo a b = Foo { foo :: a -> b }
baz :: String -> (forall a b . Foo a b) -> IO ()
baz s (Foo { foo = foo }) = putStrLn s
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