mirror of https://github.com/rust-lang/rust.git
62 lines
1.2 KiB
Rust
62 lines
1.2 KiB
Rust
//@ run-pass
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//@ needs-unwind
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#![allow(unused_variables)]
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#![allow(unused_imports)]
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// Test that builtin implementations of `Clone` cleanup everything
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// in case of unwinding.
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use std::thread;
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use std::rc::Rc;
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struct S(Rc<()>);
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impl Clone for S {
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fn clone(&self) -> Self {
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if Rc::strong_count(&self.0) == 7 {
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panic!("oops");
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}
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S(self.0.clone())
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}
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}
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fn main() {
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let counter = Rc::new(());
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// Unwinding with tuples...
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let ccounter = counter.clone();
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let result = std::panic::catch_unwind(move || {
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let _ = (
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S(ccounter.clone()),
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S(ccounter.clone()),
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S(ccounter.clone()),
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S(ccounter)
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).clone();
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});
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assert!(result.is_err());
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assert_eq!(
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1,
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Rc::strong_count(&counter)
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);
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// ... and with arrays.
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let ccounter = counter.clone();
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let child = std::panic::catch_unwind(move || {
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let _ = [
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S(ccounter.clone()),
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S(ccounter.clone()),
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S(ccounter.clone()),
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S(ccounter)
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].clone();
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});
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assert!(child.is_err());
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assert_eq!(
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1,
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Rc::strong_count(&counter)
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);
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}
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