fn swap<U,T>((a,b): (U,T)) -> (T,U)
{
  (b,a)
}

fn formatme<U: std::fmt::Display, T: std::fmt::Display>((a,b): (U,T)) -> String
{
  format!("({},{})", a, b)
}

fn main()
{
  let t1 = (3.14, "Pi");
  let t2 = (2, false);

  println!("{} <-> {}", formatme(t1), formatme(swap(t1)));
  println!("{} <-> {}", formatme(t2), formatme(swap(t2)));
}