gistfile1.rs

        assert_eq!(parse(~[BeginFunction,
                           Integer(1),
                           BeginArray,
                           Integer(2),
                           Integer(3),
                           EndArray,
                           EndFunction]),
                   ~[Function(~[Leaf(Integer(1)),
                                Array(~[Leaf(Integer(2)),
                                        Leaf(Integer(3))])])])