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// 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.
#![allow(unknown_features)]
#![feature(box_syntax)]
trait double {
fn double(self) -> usize;
}
impl double for usize {
fn double(self) -> usize { self }
}
impl double for Box<usize> {
fn double(self) -> usize { *self * 2 }
}
pub fn main() {
let x: Box<_> = box 3;
assert_eq!(x.double(), 6);
}
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