rust/src/test/run-pass/class-separate-impl.rs

// xfail-fast
import to_str::*;
import to_str::to_str;

class cat {
  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;
    }
  }
}

impl of to_str for cat {
  fn to_str() -> ~str { self.name }
}

fn print_out<T: to_str>(thing: T, expected: ~str) {
  let actual = thing.to_str();
  debug!{"%s", actual};
  assert(actual == expected);
}

fn main() {
  let nyan : to_str  = cat(0u, 2, ~"nyan") as to_str;
  print_out(nyan, ~"nyan");
}