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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE UnliftedNewtypes #-}
module T15883b where
import GHC.Exts
newtype Foo rep = MkFoo (forall (a :: TYPE rep). a)
deriving stock instance Eq (Foo (BoxedRep Lifted))
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