mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-23 23:34:48 +00:00
42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
|
// Copyright 2015 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 Foo<'r>(&'r mut i32);
|
||
|
|
|
||
|
|
impl<'r> Drop for Foo<'r> {
|
||
|
|
fn drop(&mut self) {
|
||
|
|
*self.0 += 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
trait Trait {}
|
||
|
|
impl<'r> Trait for Foo<'r> {}
|
||
|
|
|
||
|
|
struct Holder<T: ?Sized>(T);
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let mut drops = 0;
|
||
|
|
|
||
|
|
{
|
||
|
|
let y = &Holder([Foo(&mut drops)]) as &Holder<[Foo]>;
|
||
|
|
// this used to cause an extra drop of the Foo instance
|
||
|
|
let x = &y.0;
|
||
|
|
}
|
||
|
|
assert_eq!(1, drops);
|
||
|
|
|
||
|
|
drops = 0;
|
||
|
|
{
|
||
|
|
let y = &Holder(Foo(&mut drops)) as &Holder<Trait>;
|
||
|
|
// this used to cause an extra drop of the Foo instance
|
||
|
|
let x = &y.0;
|
||
|
|
}
|
||
|
|
assert_eq!(1, drops);
|
||
|
|
}
|