{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"(true,"}]}
            (true, Newline) if loop_buf.starts_with(BRK) => {
            (true, Newline | Whitespace) if loop_buf.starts_with(HDG) => parse_heading(loop_buf),
                Some((MdTree::HorizontalRule, parse_to_newline(loop_buf).1))