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{-# LANGUAGE ImpredicativeTypes, NoMonomorphismRestriction #-}
module Test where
f1 :: Maybe (forall a. [a] -> [a]) -> Maybe ([Int], [Char])
f1 (Just g) = Just (g [3], g "hello")
f1 Nothing = Nothing
f2 :: [forall a. [a] -> [a]] -> Maybe ([Int], [Char])
f2 [g] = Just (g [3], g "hello")
f2 [] = Nothing
g1 = (f1 . Just) reverse
g1' = f1 (Just reverse)
g2 = f2 [reverse]
-- Left sections not working yet
-- g2' = f2 ((: []) reverse)
g2'' = f2 (reverse : [])
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