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ahammar/gist:1019376

Created June 10, 2011 18:01
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Constrained associated type
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gistfile1.hs
{-# LANGUAGE TypeFamilies, FlexibleContexts #-}
class Xyzzy a where
xyzzy :: a -> Int
class Foo a where
type Bar a :: *
foo :: Xyzzy (Bar a) => a -> Bar a
baz :: (Foo a, Xyzzy (Bar a)) => a -> Int
baz = xyzzy . foo
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