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{-# LANGUAGE TypeFamilies #-}
module Simple9 where
import Data.Kind (Type)
-- The test succeeds with
--
-- type family F a b
-- type instance F () b = Maybe b
type family F a :: Type -> Type
type instance F () = Maybe
type family G a
type instance G (Maybe a) = Int
foo :: G (F () a) -> Int
foo x = x
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