| // 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. |
| |
| |
| use std::mem::swap; |
| |
| pub fn main() { |
| let mut x = 4; |
| |
| for i in 0_usize..3 { |
| // ensure that the borrow in this alt |
| // does not interfere with the swap |
| // below. note that it would it you |
| // naively borrowed &x for the lifetime |
| // of the variable x, as we once did |
| match i { |
| i => { |
| let y = &x; |
| assert!(i < *y); |
| } |
| } |
| let mut y = 4; |
| swap(&mut y, &mut x); |
| } |
| } |
