rust/tests/ui/mir/mir_dynamic_drops_3.rs

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