1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![feature(box_syntax)]
14 fn double(self) -> usize;
17 impl double for usize {
18 fn double(self) -> usize { self }
21 impl double for Box<usize> {
22 fn double(self) -> usize { *self * 2 }
26 let x: Box<_> = box 3;
27 assert_eq!(x.double(), 6);