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{-# LANGUAGE TypeFamilies, GADTs, UndecidableInstances #-}
module T8550 where
type family F a
type instance F () = F ()
data A where
A :: F () ~ () => A
x :: A
x = A
main :: IO ()
main = seq A (return ())
-- Note: This worked in GHC 7.8, but I (Richard E) think this regression
-- is acceptable.
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