{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"self.diag_info.last_unclosed_found_span"}]}
                    self.diag_info.last_unclosed_found_span = Some(self.token.span);
                    // do not complain about the same unclosed delimiter multiple times
                    // This is a conservative error: only report the last unclosed