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patrl/forwards-backwards.hs

Last active October 16, 2018 14:25
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forwards-backwards.hs
{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}
Module ForwardsBackwards where
import Data.Function ((&))
class A a b where
apply :: a -> b
instance A (a -> b) (a -> b) where
apply = ($)
instance A a ((a -> b) -> b) where
apply = (&)
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