rust/src/test/compile-fail/mutable-class-fields-2.rs

// error-pattern:assigning to immutable field
struct cat {
  priv {
    mut meows : uint,
  }

  how_hungry : int,
}

impl cat {
  fn eat() {
    self.how_hungry -= 5;
  }

}

fn cat(in_x : uint, in_y : int) -> cat {
    cat {
        meows: in_x,
        how_hungry: in_y
    }
}

fn main() {
  let nyan : cat = cat(52u, 99);
  nyan.eat();
}