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brentonashworth/gist:904481

Created April 5, 2011 20:32
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Polymorphic on return type
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gistfile1.hs
{-# LANGUAGE TypeSynonymInstances #-}
class TwoOf a where
twoOf :: String -> a
instance TwoOf Bool where
twoOf str = length str >= 2
instance TwoOf String where
twoOf str = take 2 str
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