3607c7a982
Remove the ability of the borrow checker to determine that repeated dereferences of a Box<T> refer to the same memory object. This will usually require one of two workarounds: 1) The interior of a Box<T> will sometimes need to be moved / borrowed into a temporary before moving / borrowing individual derived paths. 2) A `ref x` pattern will have to be replaced with a `box ref x` pattern. Fixes #16094. [breaking-change]
23 lines
752 B
Rust
23 lines
752 B
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.
|
|
|
|
|
|
struct Pair { a: Box<int>, b: Box<int> }
|
|
|
|
pub fn main() {
|
|
let mut x = box Pair {a: box 10, b: box 20};
|
|
let x_internal = &mut *x;
|
|
match *x_internal {
|
|
Pair {a: ref mut a, b: ref mut _b} => {
|
|
assert!(**a == 10); *a = box 30; assert!(**a == 30);
|
|
}
|
|
}
|
|
}
|