[code]
fn swap(a: *i32, b: *i32) {
    let temp = *a;
    *a = *b;
    *b = temp;
}

fn main() -> i32 {
    let a = [10, 20];
    swap(&a[0], &a[1]);
    return a[0] - a[1]; // 20 - 10 = 10
}

[expected_return_code]
10