struct S {
  a: i32,
  b: i32
}

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

  p.a = 666;
  if a == 3 {
    let p1 = p;

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

    p = p1;
  }

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