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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UnliftedNewtypes #-}
module T17021 where
import Data.Kind
import GHC.Exts
type family Id (x :: a) :: a where
Id x = x
newtype T :: TYPE (Id LiftedRep) where
MkT :: Int -> T
f :: T
f = MkT 42
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