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onlyshk/gist:1441857

Created December 7, 2011 07:27
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Liftable
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gistfile1.hs
{-# OPTIONS -fglasgow-exts #-}
{-# LANGUAGE AllowUndecidableInstances #-}
import Control.Monad
instance (Functor m, Monad m) => Liftable m where
zipL = liftM2 (\x y -> (x,y))
zeroL = return ()
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