//use std::ops::Deref;

struct S {
  v: i64
}

fn print_s(s: &S)
{
  println!("S->v: {}", s.v)
}

fn main()
{
  let v    = S{v: 1};
  let sp   = Box::new(S{v: 1});
  let rc   = std::rc::Rc::new(S{v: 2}); 
  let cell = std::cell::RefCell::new(S{v: 3});

  print_s(&v);
  print_s(&sp);
  print_s(&rc.clone());
  print_s(&(*cell.borrow()));

  print_s(&v);
  print_s(&sp);
  print_s(&rc);
  print_s(&cell.borrow());
}