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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UnliftedNewtypes #-}
module T16821 where
import Data.Kind
type family Id (x :: Type) :: Type where
Id x = x
newtype T :: Id Type where
MkT :: Int -> T
f :: T -> T
f (MkT x) = MkT (x + 1)
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