{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
            let r1_outlives_r2 = self.universal_region_relations.outlives(r1, r2);
        let Some(min_choice) = totally_ordered_subset.reduce(|r1, r2| {
            let r2_outlives_r1 = self.universal_region_relations.outlives(r2, r1);