struct S {
  v: i32
}

fn f(v: i32) -> i32 {
  (v + 1) / 2
}

fn main()
{
  let cell = std::cell::RefCell::new(S{v:666});
  let c1 = std::cell::RefCell::new(S{v:0});
  let a = f(-1);
  let r1   = cell.borrow();
  let mut r2 = c1.borrow_mut();
  let r3;

  if a == 0 {
    r3 = cell.borrow();
  } else {
    r2 = cell.borrow_mut();
  }

  println!("{} {}", r1.v, r2.v)
}