{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"assert_eq!(t,"}]}
    assert_eq!(t, MdTree::Comment(r"foobar! \"));
    let (t, r) = parse_simple_pat(buf.as_bytes(), CMT_S, CMT_E, opt, MdTree::Comment).unwrap();
    assert_eq!(r, b"rest");