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{-# LANGUAGE FunctionalDependencies, FlexibleContexts #-}
class C a where
class D a where
dop :: a -> a
instance C a => D [a] where
dop = undefined
class J a b | a -> b
where j :: a -> b -> ()
instance J Bool Int where
j = undefined
foo :: D [Int] => ()
foo = j True (head (dop [undefined]))
main = return ()
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