37 lines
1.1 KiB
Rust
37 lines
1.1 KiB
Rust
// Copyright 2012-2014 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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use std::gc::GC;
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fn borrow(x: &int, f: |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 = box(GC) 3;
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borrow(&*x, |b_x| {
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//~^ ERROR cannot borrow `x` as mutable because `*x` is also borrowed as immutable
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assert_eq!(*b_x, 3);
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assert_eq!(&(*x) as *const int, &(*b_x) as *const int);
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//~^ NOTE borrow occurs due to use of `x` in closure
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x = box(GC) 22;
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println!("&*b_x = {:p}", &(*b_x));
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assert_eq!(*b_x, 3);
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assert!(&(*x) as *const int != &(*b_x) as *const int);
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})
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}
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