24 lines
626 B
Rust
24 lines
626 B
Rust
|
#[test]
|
||
|
|
fn select_unpredictable_drop() {
|
||
|
|
use core::cell::Cell;
|
||
|
|
struct X<'a>(&'a Cell<bool>);
|
||
|
|
impl Drop for X<'_> {
|
||
|
|
fn drop(&mut self) {
|
||
|
|
self.0.set(true);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
let a_dropped = Cell::new(false);
|
||
|
|
let b_dropped = Cell::new(false);
|
||
|
|
let a = X(&a_dropped);
|
||
|
|
let b = X(&b_dropped);
|
||
|
|
assert!(!a_dropped.get());
|
||
|
|
assert!(!b_dropped.get());
|
||
|
|
let selected = core::hint::select_unpredictable(core::hint::black_box(true), a, b);
|
||
|
|
assert!(!a_dropped.get());
|
||
|
|
assert!(b_dropped.get());
|
||
|
|
drop(selected);
|
||
|
|
assert!(a_dropped.get());
|
||
|
|
assert!(b_dropped.get());
|
||
|
|
}
|