Comparison not working

Comparison Problem

enum Ordering {
    Less,
    Equal,
    Greater,
}

fn cmp(a: int, b: int) -> Ordering {
    if a < b { Less }
    else if a > b { Greater }
    else { Equal }
}

fn main() {
    let x = 5i;
    let y = 6i;

    let ordering = cmp(x, y);

    if ordering == Less {
        println!("less");
    } else if ordering == Equal {
        println!("equal");
    } else {
        println!("greater");
    }
}

Compilation output

vagrant@vagrant-ubuntu-trusty-64:/vagrant/projects/hello_world$ cargo build && ./target/hello_world
   Compiling hello_world v0.0.1 (file:///vagrant/projects/hello_world)
/vagrant/projects/hello_world/src/main.rs:19:5: 19:21 error: binary operation `==` cannot be applied to type `Ordering`
/vagrant/projects/hello_world/src/main.rs:19    if ordering == Less {
                                                   ^~~~~~~~~~~~~~~~
/vagrant/projects/hello_world/src/main.rs:21:12: 21:29 error: binary operation `==` cannot be applied to type `Ordering

/vagrant/projects/hello_world/src/main.rs:21    } else if ordering == Equal {
                                                          ^~~~~~~~~~~~~~~~~
error: aborting due to 2 previous errors
Could not compile `hello_world`.

To learn more, run the command again with --verbose.
vagrant@vagrant-ubuntu-trusty-64:/vagrant/projects/hello_world$ rustc --version
rustc 0.13.0-nightly (b87619e27 2014-11-02 23:27:10 +0000)

enum Ordering {
    Less,
    Equal,
    Greater,
}

fn cmp(a: int, b: int) -> Ordering {
    if a < b { Less }
    else if a > b { Greater }
    else { Equal }
}

fn main() {
    let x = 5i;
    let y = 6i;

    let ordering = cmp(x, y);

    match ordering {
        Less => println!("less"),
        Equal => println!("equal"),
        Greater => println!("greater"),
    }
}