| // 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 repeat<A> { fn get(&self) -> A; } |
| |
| impl<A:Clone + 'static> repeat<A> for Box<A> { |
| fn get(&self) -> A { |
| (**self).clone() |
| } |
| } |
| |
| fn repeater<A:Clone + 'static>(v: Box<A>) -> Box<repeat<A>+'static> { |
| box v as Box<repeat<A>+'static> // No |
| } |
| |
| pub fn main() { |
| let x = 3; |
| let y = repeater(box x); |
| assert_eq!(x, y.get()); |
| } |
