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{-# LANGUAGE DeepSubsumption #-}
{-# LANGUAGE NoPolyKinds #-}
module DeepSubsumption03 where
class Profunctor p where
dimap :: (s -> a) -> (b -> t) -> p i a b -> p i s t
type Iso s t a b = forall p i . Profunctor p => p i a b -> p i s t
iso :: (s -> a) -> (b -> t) -> Iso s t a b
-- iso f g = dimap f g
iso = dimap
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