Rust move

fn main() {
    let mut v = vec![1,2,3,4,5];
    v = vec_swap(v);
    v[0] = 55;
    println!("{:?}", v);
}

fn vec_swap<T: Copy>(mut v: Vec<T>) -> Vec<T> {
    if v.len() >= 2 {
        let tmp = v[0];
        v[0] = v[1];
        v[1] = tmp;
    }
    v
}