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fragamus/gist:747fd299e63477bdef71c33812c3265b

Created December 2, 2018 19:55
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gistfile1.txt
data Store s a = Store (s -> a) s deriving Functor
instance Comonad (Store s) where
extract (Store f s) = f s
duplicate (Store f s) = Store (Store f) s
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