blob: a6d44237b0d98436e580426b0922470e961eb42e (
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
|
// Ensure that *any* assignment to the return place of a value with interior mutability
// disqualifies it from promotion.
use std::cell::Cell;
const X: Option<Cell<i32>> = {
let mut x = None;
if false {
x = Some(Cell::new(4));
}
x
};
const Y: Option<Cell<i32>> = {
let mut y = Some(Cell::new(4));
if true {
y = None;
}
y
};
const Z: Option<Cell<i32>> = {
let mut z = None;
let mut i = 0;
while i < 10 {
if i == 8 {
z = Some(Cell::new(4));
}
if i == 9 {
z = None;
}
i += 1;
}
z
};
fn main() {
let x: &'static _ = &X; //~ ERROR temporary value dropped while borrowed
let y: &'static _ = &Y; //~ ERROR temporary value dropped while borrowed
let z: &'static _ = &Z; //~ ERROR temporary value dropped while borrowed
}
|
