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{-# LANGUAGE LinearTypes, GADTs, DataKinds, KindSignatures #-}
-- this caused a TcLevel assertion failure
module T18998 where
import GHC.Types
import GHC.TypeLits
data Id :: Nat -> Type -> Type where
MkId :: a %1-> Id 0 a
f :: a %1-> Id n a -> Id n a
f a (MkId _) = MkId a
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