{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"assert_eq!(t,"}]}
    assert_eq!(t, MdTree::CodeBlock { txt: "code\ncode", lang: Some("rust") });
    let (t, r) = parse_codeblock(buf1.as_bytes());
    assert_eq!(r, b"\nleftovers");