rust/src/test/run-pass/traits-default-method-trivial.rs

// 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() -> bool;
    fn scratch() -> bool;
    fn purr() -> bool { true }
}

impl int : Cat {
    fn meow() -> bool {
        self.scratch()
    }
    fn scratch() -> bool {
        self.purr()
    }
}

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