Pre: Intern lookup_ref by reference.
Pre: Intern lookup_ref by reference.

mozilla/mentat,ncalexan/mentat,ncalexan/mentat,ncalexan/mentat,mozilla/mentat,mozilla/mentat,ncalexan/datomish,mozilla/mentat,mozilla/mentat,ncalexan/mentat,ncalexan/mentat,ncalexan/datomish,mozilla/mentat,ncalexan/mentat