rust/src/test/run-pass/panic-recover-propagate.rs

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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// ignore-emscripten no threads support
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#![feature(std_panic, recover, panic_propagate, panic_handler, const_fn)]
use std::sync::atomic::{AtomicUsize, Ordering};
use std::panic;
use std::thread;
static A: AtomicUsize = AtomicUsize::new(0);
fn main() {
panic::set_handler(|_| {
A.fetch_add(1, Ordering::SeqCst);
});
let result = thread::spawn(|| {
let result = panic::recover(|| {
panic!("hi there");
});
panic::propagate(result.unwrap_err());
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}).join();
let msg = *result.unwrap_err().downcast::<&'static str>().unwrap();
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assert_eq!("hi there", msg);
assert_eq!(1, A.load(Ordering::SeqCst));
}