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onlyshk/gist:1338842

Created November 4, 2011 07:20
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Foldable
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gistfile1.hs
class Foldable t where
foldr :: (a -> b -> b) -> b -> [a] -> [b]
foldMap :: (Monoid m, Foldable t) => (a -> m) -> t a -> m
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