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{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE PolyKinds #-}
module T14441 where
import Data.Kind
type family Demote (k :: Type) :: Type
type family DemoteX (a :: k) :: Demote k
data Prox (a :: k) = P
type instance Demote (Prox (a :: k)) = Prox (DemoteX a)
$(return [])
type instance DemoteX P = P
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