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

fn main() -> i32 {
    let x = 10;
    let y = 20;
    swap(&x, &y);
    return x - y; // 20 - 10 = 10
}

[expected_return_code]
10