33 lines
998 B
Rust
33 lines
998 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 before == after;
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}
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struct F { f: ~int }
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fn main() {
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let mut x = ~mut @F{f: ~3};
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do borrow(x.f) |b_x| {
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assert *b_x == 3;
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assert ptr::addr_of(&(*x.f)) == ptr::addr_of(&(*b_x));
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*x = @F{f: ~4};
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debug!("ptr::addr_of(*b_x) = %x", ptr::addr_of(&(*b_x)) as uint);
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assert *b_x == 3;
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assert ptr::addr_of(&(*x.f)) != ptr::addr_of(&(*b_x));
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}
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} |