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{-# LANGUAGE ExplicitForAll, TypeOperators #-}
module Main where
-- Infix type operator
f1 :: forall m a b. (a `m` b) -> ((a `m` b) -> a) -> a
f1 x g = g x
-- Infix type operator
f2 :: forall a b (-->). (a --> b) -> ((a --> b) -> b) -> b
f2 x g = g x
main = do { print (f1 (3,5) fst); print (f2 (3,5) snd) }
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