// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//


trait Cat {
    fn meow(&self) -> bool;
    fn scratch(&self) -> bool;
    fn purr(&self) -> bool { true }
}

impl Cat for isize {
    fn meow(&self) -> bool {
        self.scratch()
    }
    fn scratch(&self) -> bool {
        self.purr()
    }
}

pub fn main() {
    assert!(5.meow());
}