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{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeInType #-}
{-# LANGUAGE TypeOperators #-}
module T14366 where
import Data.Kind
import Data.Type.Equality
type family Cast (a :: Type) (b :: Type) (e :: a :~: b) (x :: a) :: b where
Cast _ _ Refl x = x
type family F (a :: Type) :: Type where
F (a :: _) = a
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