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{-# LANGUAGE TypeFamilies, FlexibleContexts #-}
-- Results in context reduction stack overflow
module Class1 where
class C a where
foo :: a x -> a y
class C (T a) => D a where
type T a :: * -> *
bar :: a -> T a x -> T a y
instance C Maybe where
foo Nothing = Nothing
instance D () where
type T () = Maybe
bar x t = foo t
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