{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"ty::GenericArgKind::Lifetime(re)"}]}
            ty::GenericArgKind::Lifetime(re) => {
        let existing = match var.kind() {
                if let ty::RegionKind::ReBound(ty::INNERMOST, bv) = re.kind() {