Function assert_range_difference

ostd/src/util/ops.rs:33–43

(
        a: Range<usize>,
        b: Range<usize>,
        expected: [Range<usize>; N],
    )

    };
    let right = if !b.start.is_lt(&b.end) {
        b
    } else {
        Range { start: spec_ord_max(a.start, b.end), end: a.end }
    };
    if left.start.is_lt(&left.end) {
        if right.start.is_lt(&right.end) {
            seq![left, right]
        } else {
            seq![left]
        }
    } else if right.start.is_lt(&right.end) {
        seq![right]
    } else {
        Seq::empty()