{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
        let path = path.as_deref().unwrap_or("<unknown file>");
        let path = source_root.path_for_file(&file_id).map(|x| x.to_string());
        match db.line_index(file_id).try_line_col(text_range.start()) {