// I AM NOT DONE

    let z = &mut *y;

    let z = &mut *y;

// I AM NOT DONE

    let vec0 = Vec::new();

    let mut vec1 = fill_vec();

    let mut vec1 = fill_vec(vec0);

    let mut vec = vec;
    vec.push(22);
    vec.push(44);
    vec.push(66);
    vec

    vec![22, 44, 66]

// I AM NOT DONE

fn fill_vec(vec: Vec<i32>) -> Vec<i32> {

fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {

// I AM NOT DONE

    let mut vec1 = fill_vec(vec0);

    let mut vec1 = fill_vec(vec0.clone());

// I AM NOT DONE

    let vec1 = fill_vec(vec0);

    let mut vec1 = fill_vec(vec0);