{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"assert_eq!(t,"}]}
    assert_eq!(t, MdTree::CodeBlock { txt: "code\ncode````", lang: None });
    let (t, r) = parse_codeblock(buf2.as_bytes());
    assert_eq!(r, b"\nleftovers");