{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"None"}]}
                None => " (unknown line col)".to_owned(),
            let line_col = match db.line_index(file_id).try_line_col(text_range.start()) {
                Some(x) => format!("#{}:{}", x.line + 1, x.col),