Comparison Problem

#[deriving(PartialEq)]
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");
    }
}