Bitwise or of all subsequence sums

#[test]
fn test_example1() {
    let start = std::time::Instant::now();
    let val = Solution::subsequence_sum_or(vec![2, 1, 0, 3]);
    let expected = 7;
    log_result!(val == expected, "test_example1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example2() {
    let start = std::time::Instant::now();
    let val = Solution::subsequence_sum_or(vec![0, 0, 0]);
    let expected = 0;
    log_result!(val == expected, "test_example2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_powers_of_two() {
    let start = std::time::Instant::now();
    let val = Solution::subsequence_sum_or(vec![1, 2, 4]);
    let expected = 7;
    log_result!(val == expected, "test_powers_of_two", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_same_elements() {
    let start = std::time::Instant::now();
    let val = Solution::subsequence_sum_or(vec![3, 3]);
    let expected = 7;
    log_result!(val == expected, "test_same_elements", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_single_element() {
    let start = std::time::Instant::now();
    let val = Solution::subsequence_sum_or(vec![5]);
    let expected = 5;
    log_result!(val == expected, "test_single_element", start, &expected, &val);
    assert_eq!(val, expected);
}