{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"RegionResolutionError::UpperBoundUniverseConflict(a,"}]}
                RegionResolutionError::UpperBoundUniverseConflict(a, _, _, _, b) => {
                RegionResolutionError::SubSupConflict(_, _, _, a, _, b, _) => format!("{b}: {a}"),
                    format!("{b}: {a}", a = ty::Region::new_var(tcx, a))