{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"assert!(underline_start"}]}
                    assert!(underline_start >= 0 && underline_end >= 0);
                    let underline_end = (span_start_pos + start + sub_len) as isize + offset;
                    let padding: usize = max_line_num_len + 3;