{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"ty::RePlaceholder(placeholder)"}]}
                    ty::RePlaceholder(placeholder) => placeholder.universe,
                    | ty::ReError(_) => ty::UniverseIndex::ROOT,
                    ty::ReVar(..) | ty::ReBound(..) => bug!("not a universal region"),