{"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"assert_eq!(t,"}]}
    assert_eq!(t, MdTree::Strong("abcd"));
    let (t, r) = parse_simple_pat(buf.as_bytes(), b"**", b"**", PO::None, MdTree::Strong).unwrap();
    assert_eq!(r, b" rest");