{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"for"}]}
        for &(_, span) in &self.diag_info.open_delimiters[..len] {
        let len = usize::min(UNCLOSED_DELIMITER_SHOW_LIMIT, self.diag_info.open_delimiters.len());
            err.span_label(span, "unclosed delimiter");