33 lines
1022 B
Rust
33 lines
1022 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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// exec-env:RUST_POISON_ON_FREE=1
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fn borrow(x: &int, f: &fn(x: &int)) {
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let before = *x;
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f(x);
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let after = *x;
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assert_eq!(before, after);
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}
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pub fn main() {
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let mut x = @3;
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do borrow(x) |b_x| {
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assert_eq!(*b_x, 3);
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assert_eq!(ptr::to_unsafe_ptr(&(*x)), ptr::to_unsafe_ptr(&(*b_x)));
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x = @22;
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debug!("ptr::to_unsafe_ptr(*b_x) = %x",
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ptr::to_unsafe_ptr(&(*b_x)) as uint);
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assert_eq!(*b_x, 3);
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assert!(ptr::to_unsafe_ptr(&(*x)) != ptr::to_unsafe_ptr(&(*b_x)));
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}
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}
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