43 lines
876 B
Rust
43 lines
876 B
Rust
// 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 T {
|
|
fn print(&self);
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct S {
|
|
s: isize,
|
|
}
|
|
|
|
impl T for S {
|
|
fn print(&self) {
|
|
println!("{:?}", self);
|
|
}
|
|
}
|
|
|
|
fn print_t(t: &T) {
|
|
t.print();
|
|
}
|
|
|
|
fn print_s(s: &S) {
|
|
s.print();
|
|
}
|
|
|
|
pub fn main() {
|
|
let s: Box<S> = box S { s: 5 };
|
|
print_s(&*s);
|
|
let t: Box<T> = s as Box<T>;
|
|
print_t(&*t);
|
|
}
|