Compose two `Ordering`s using transitive relations

libs
#1

Wouldn't it be convenient to have the following API that "composes" two Ordering according to the transitive relations? I'm not sure with the naming though.

impl Ordering {
  fn compose(self, other: Ordering) -> Option<Ordering> {
    use Ordering::*;
    match (a, b) {
        (x, Equal) | (Equal, x) => Some(x),
        (Less, Less) | (Greater, Greater) => Some(a),
        _ => None,
    }
  }
}
#2

Great minds think alike!

EDIT: but my mind is clearly not great, since it misinterpreted what you meant by “compose”

#3

Do you mean match(self, other)?

Anyway, what’s the use case for this operation?