32 lines
963 B
Rust
32 lines
963 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::mem::swap;
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pub fn main() {
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let mut x = 4;
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for i in range(0u, 3) {
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// ensure that the borrow in this alt
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// does not inferfere with the swap
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// below. note that it would it you
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// naively borrowed &x for the lifetime
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// of the variable x, as we once did
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match i {
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i => {
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let y = &x;
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assert!(i < *y);
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}
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}
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let mut y = 4;
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swap(&mut y, &mut x);
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}
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}
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