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{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
{-# LANGUAGE RankNTypes #-}
module T3692 where
type Foo a b = () -> (Bar a => a)
class Bar a where {}
boo :: Foo p q
boo x = undefined
foo :: Foo a b
foo y = id (\x -> boo x) y
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