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ofan/test.hs

Created June 25, 2013 09:39
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test.hs
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE FlexibleInstances #-}
class YesNo a where
yesno :: a -> Bool
instance (Num a, Eq a) => YesNo a where
yesno 0 = False
yesno _ = True
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