mirror of https://github.com/rust-lang/rust
36 lines
823 B
Rust
36 lines
823 B
Rust
//@ run-fail
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//@ needs-unwind
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//@ error-pattern:unwind happens
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//@ error-pattern:drop 3
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//@ error-pattern:drop 2
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//@ 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);
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impl<'a> Drop for Droppable<'a> {
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fn drop(&mut self) {
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if *self.0 {
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eprintln!("{} dropped twice", self.1);
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::std::process::exit(1);
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}
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eprintln!("drop {}", self.1);
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*self.0 = true;
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}
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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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}
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fn mir<'a>(d: Droppable<'a>) {
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let (mut a, mut b) = (false, false);
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let y = Droppable(&mut a, 2);
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let x = [Droppable(&mut b, 1), y, d, may_panic()];
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}
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fn main() {
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let mut c = false;
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mir(Droppable(&mut c, 3));
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}
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