vector mutability

fn mutate_vector(v: &mut Vec<i32>) {
  // is this correct? &*v seems dirty but is required
  // due to the function header...
  
  for i in &*v {
    // do something
  }
  
  v.push(32);
}

#[test]
fn mutate_vector_test() {
  let mut v = vec![1, 2, 3];
  
  mutate_vector(&mut v);
  
  assert_eq!(4, v.len());
  assert_eq!(32, v[v.len() - 1]);
}