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{-# LANGUAGE RankNTypes, MagicHash, TypeFamilies, PolyKinds #-}
module T9357 where
import GHC.Exts
type family F (a :: k1) :: k2
type instance F Int# = Int
-- This one is actually OK (F is poly-kinded;
-- c.f. #11120 comment:19
type instance F (forall a. a->a) = Int
-- But this one is not (impredicative)
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