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{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FunctionalDependencies #-}
{-# LANGUAGE UndecidableInstances #-}
module T816 where
class Foo x y | x -> y where
foo :: x -> y
class Bar x y where
bar :: x -> y -> Int
instance (Foo x y, Bar y z) => Bar x z where
bar x z = bar (foo x) z
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