// 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 Foo {
    fn f(&self);
}

struct S {
    x: int
}

impl S : Foo {
    fn f(&self) {
        assert self.x == 3;
    }
}

fn main() {
    let x = @S { x: 3 };
    let y = x as @Foo;
    y.f();
}