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