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{-# Language RankNTypes #-}
{-# Language TypeFamilies #-}
{-# Language TypeApplications #-}
{-# Language PolyKinds #-}
module T15793 where
import Data.Kind
type family
F1 (a :: Type) :: Type where
F1 a = Maybe a
f1 :: F1 a
f1 = Nothing
type family
F2 :: forall (a :: Type). Type where
F2 @a = Maybe a
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