yes: least significant bit is set for every odd number ;-)

Random test on https://www.codewars.com/kumite/6265f7afe67fbaf7b37204a6?sel=6265f7afe67fbaf7b37204a6

Thanks for your comment.

I've adapted @My-'s code to Rust 1.60 and rand::Rng +0.8.0 (Changelog 'gen_range(a, b) was replaced with gen_range(a..b)" ir order to compile the battery of tests.

I suggest to include (Rust language) this test in order to check non empty vector when all elements are zero (see my last exercise attempt to understand the reason):

#[test]
fn all_zeroes_not_empty_result() {
    assert_eq!(count_positives_sum_negatives(vec![0]), vec![0, 0]);
    assert_eq!(count_positives_sum_negatives(vec![0, 0, 0, 0]), vec![0, 0]);
}

Clever too much since test asserts don't cover when all elements in array are 0 ;-)

I suggest to include this new assert in the exercise:

    assert_eq!(count_positives_sum_negatives(vec![0]), vec![0,0]);