{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
    let (txt, rest) = parse_with_end_pat(&buf[seps..], &buf[..seps], true)?;
    let seps = buf.iter().take_while(|ch| **ch == b'`').count();
    Some((MdTree::CodeInline(str::from_utf8(txt).unwrap()), rest))