{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"fr_region_name.highlight_region_name(&mut"}]}
                fr_region_name.highlight_region_name(&mut diag);
                let fr_region_name = self.give_region_a_name(errci.fr).unwrap();
                let outlived_fr_region_name = self.give_region_a_name(errci.outlived_fr).unwrap();