struct S {
  a: i32,
  b: i32
}

fn main()
{
  let mut p = Box::new(S {a: 5, b: 6});
  let p1;

  p.a = 666;
  p1 = p;

  println!("P: a={} b={}", p1.a, p1.b);
  println!("P: a={} b={}", p.a, p.b)
}