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// Copyright 2016 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.
// check that panics in destructors during assignment do not leave
// destroyed values lying around for other destructors to observe.
// error-pattern:panicking destructors ftw!
struct Observer<'a>(&'a mut FilledOnDrop);
struct FilledOnDrop(u32);
impl Drop for FilledOnDrop {
fn drop(&mut self) {
if self.0 == 0 {
// this is only set during the destructor - safe
// code should not be able to observe this.
self.0 = 0x1c1c1c1c;
panic!("panicking destructors ftw!");
}
}
}
impl<'a> Drop for Observer<'a> {
fn drop(&mut self) {
assert_eq!(self.0 .0, 1);
}
}
fn foo(b: &mut Observer) {
*b.0 = FilledOnDrop(1);
}
fn main() {
let mut bomb = FilledOnDrop(0);
let mut observer = Observer(&mut bomb);
foo(&mut observer);
}
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