Delete duplicate in an Array

uniq.rs

fn uniq(arr: &[i32]) -> Vec<i32> {
    let mut res = vec![arr[0]];
    for a in arr.iter().skip(1) {
        let mut uniq = true;
        for n in res.iter() {
            if a == n {
                uniq = false;
            }
        }
        if uniq { res.push(*a) };
    };
    res
}

#[test]
fn test_uniq() {
    assert_eq!(
        uniq(&[2, 45, 7, 45, 11, -7, 8, 7, 992]),
        vec![2, 45, 7, 11, -7, 8, 992]
    );
}