41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
// 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.
|
|
// error-pattern:drop 1
|
|
// error-pattern:drop 2
|
|
use std::io::{self, Write};
|
|
|
|
|
|
/// Structure which will not allow to be dropped twice.
|
|
struct Droppable<'a>(&'a mut bool, u32);
|
|
impl<'a> Drop for Droppable<'a> {
|
|
fn drop(&mut self) {
|
|
if *self.0 {
|
|
writeln!(io::stderr(), "{} dropped twice", self.1);
|
|
::std::process::exit(1);
|
|
}
|
|
writeln!(io::stderr(), "drop {}", self.1);
|
|
*self.0 = true;
|
|
}
|
|
}
|
|
|
|
fn mir() {
|
|
let (mut xv, mut yv) = (false, false);
|
|
let x = Droppable(&mut xv, 1);
|
|
let y = Droppable(&mut yv, 2);
|
|
let mut z = x;
|
|
let k = y;
|
|
z = k;
|
|
}
|
|
|
|
fn main() {
|
|
mir();
|
|
panic!();
|
|
}
|