| // Copyright 2013 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)] |
| |
| struct X { |
| a: isize |
| } |
| |
| trait Changer { |
| fn change(mut self: Box<Self>) -> Box<Self>; |
| } |
| |
| impl Changer for X { |
| fn change(mut self: Box<X>) -> Box<X> { |
| self.a = 55; |
| self |
| } |
| } |
| |
| pub fn main() { |
| let x: Box<_> = box X { a: 32 }; |
| let new_x = x.change(); |
| assert_eq!(new_x.a, 55); |
| } |
