ined) {
                        glob_group(file, data.g, span_ids);
                    }
                    if (data.s != undefined) {
                        data.s.forEach(span_id => span_ids.add(span_id));
                    }
                };

                let glob_node = (file, nodes, span_ids) => {
                    nodes.forEach(node => {
                        let data = node[1];
                        coverage_spans(file, data, span_ids);
                        if (data.c) {
          