blob: 79671054ca76cafbc33583dc154d44c9a1f22e74 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
// run-pass
//! Test that let bindings and destructuring assignments have consistent drop orders
#![allow(unused_variables, unused_assignments)]
use std::cell::RefCell;
thread_local! {
static DROP_ORDER: RefCell<Vec<usize>> = RefCell::new(Vec::new());
}
struct DropRecorder(usize);
impl Drop for DropRecorder {
fn drop(&mut self) {
DROP_ORDER.with(|d| d.borrow_mut().push(self.0));
}
}
fn main() {
let expected_drop_order = vec![1, 4, 5, 3, 2];
// Check the drop order for let bindings:
{
let _ = DropRecorder(1);
let _val = DropRecorder(2);
let (x, _) = (DropRecorder(3), DropRecorder(4));
drop(DropRecorder(5));
}
DROP_ORDER.with(|d| {
assert_eq!(&*d.borrow(), &expected_drop_order);
d.borrow_mut().clear();
});
// Check that the drop order for destructuring assignment is the same:
{
let _val;
let x;
_ = DropRecorder(1);
_val = DropRecorder(2);
(x, _) = (DropRecorder(3), DropRecorder(4));
drop(DropRecorder(5));
}
DROP_ORDER.with(|d| assert_eq!(&*d.borrow(), &expected_drop_order));
}
|
