43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(rustc_attrs)]
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// error-pattern:drop 1
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// error-pattern:drop 2
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use std::io::{self, Write};
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/// Structure which will not allow to be dropped twice.
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struct Droppable<'a>(&'a mut bool, u32);
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impl<'a> Drop for Droppable<'a> {
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fn drop(&mut self) {
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if *self.0 {
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writeln!(io::stderr(), "{} dropped twice", self.1);
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::std::process::exit(1);
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}
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writeln!(io::stderr(), "drop {}", self.1);
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*self.0 = true;
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}
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}
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#[rustc_mir]
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fn mir() {
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let (mut xv, mut yv) = (false, false);
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let x = Droppable(&mut xv, 1);
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let y = Droppable(&mut yv, 2);
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let mut z = x;
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let k = y;
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z = k;
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}
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fn main() {
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mir();
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panic!();
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}
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