{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"trace!(scc"}]}
        trace!(scc = ?self.constraint_sccs.scc(fr1));
    pub(crate) fn find_sub_region_live_at(&self, fr1: RegionVid, location: Location) -> RegionVid {
        trace!(universe = ?self.max_nameable_universe(self.constraint_sccs.scc(fr1)));