rust/tests/ui/mir/mir_dynamic_drops_3.rs
2024-02-16 20:02:50 +00:00

36 lines
823 B
Rust

//@ run-fail
//@ needs-unwind
//@ error-pattern:unwind happens
//@ error-pattern:drop 3
//@ error-pattern:drop 2
//@ error-pattern:drop 1
//@ ignore-emscripten no processes
/// Structure which will not allow to be dropped twice.
struct Droppable<'a>(&'a mut bool, u32);
impl<'a> Drop for Droppable<'a> {
fn drop(&mut self) {
if *self.0 {
eprintln!("{} dropped twice", self.1);
::std::process::exit(1);
}
eprintln!("drop {}", self.1);
*self.0 = true;
}
}
fn may_panic<'a>() -> Droppable<'a> {
panic!("unwind happens");
}
fn mir<'a>(d: Droppable<'a>) {
let (mut a, mut b) = (false, false);
let y = Droppable(&mut a, 2);
let x = [Droppable(&mut b, 1), y, d, may_panic()];
}
fn main() {
let mut c = false;
mir(Droppable(&mut c, 3));
}