rust/src/test/run-pass/class-cast-to-iface.rs

iface noisy {
  fn speak();
}

class cat : noisy {
  priv {
    let mut meows : uint;
    fn meow() {
      #error("Meow");
      self.meows += 1u;
      if self.meows % 5u == 0u {
          self.how_hungry += 1;
      }
    }
  }

  let mut how_hungry : int;
  let name : ~str;

  new(in_x : uint, in_y : int, in_name: ~str)
    { self.meows = in_x; self.how_hungry = in_y; self.name = in_name; }

  fn speak() { self.meow(); }

  fn eat() -> bool {
    if self.how_hungry > 0 {
        #error("OM NOM NOM");
        self.how_hungry -= 2;
        ret true;
    }
    else {
        #error("Not hungry!");
        ret false;
    }
  }
}

fn main() {
  let nyan : noisy  = cat(0u, 2, ~"nyan") as noisy;
  nyan.speak();
}