35 lines
1.0 KiB
Rust
35 lines
1.0 KiB
Rust
// 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.
|
|
|
|
// exec-env:RUST_POISON_ON_FREE=1
|
|
|
|
fn borrow(x: &int, f: &fn(x: &int)) {
|
|
let before = *x;
|
|
f(x);
|
|
let after = *x;
|
|
assert_eq!(before, after);
|
|
}
|
|
|
|
struct F { f: ~int }
|
|
|
|
pub fn main() {
|
|
let mut x = @F {f: ~3};
|
|
do borrow(x.f) |b_x| {
|
|
assert_eq!(*b_x, 3);
|
|
assert_eq!(ptr::to_unsafe_ptr(&(*x.f)), ptr::to_unsafe_ptr(&(*b_x)));
|
|
x = @F {f: ~4};
|
|
|
|
debug!("ptr::to_unsafe_ptr(*b_x) = %x",
|
|
ptr::to_unsafe_ptr(&(*b_x)) as uint);
|
|
assert_eq!(*b_x, 3);
|
|
assert!(ptr::to_unsafe_ptr(&(*x.f)) != ptr::to_unsafe_ptr(&(*b_x)));
|
|
}
|
|
}
|