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kcsongor/BrokenStar.hs

Last active December 26, 2017 22:38
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BrokenStar.hs
{-# LANGUAGE ImpredicativeTypes #-}
{-# LANGUAGE TypeFamilies #-}
module BrokenStar where
type family Break a where
Break (a -> b) = (a, b)
broken :: Break (Applicative f => a -> f a)
broken = undefined
-- >>> :t broken
-- broken :: (Applicative f, a -> f a)
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