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michaelficarra/Main.hs

Forked from paf31/Main.hs
Created May 24, 2015 17:00
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Main.hs
{-# LANGUAGE PolyKinds, KindSignatures, MultiParamTypeClasses #-}
module Main where
class Category (arr :: k -> k -> *) where
id :: arr t t
(.) :: arr b c -> arr a b -> arr a c
instance Category (->) where
id x = x
(f . g) x = f (g x)
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