61 lines
2.3 KiB
Rust
61 lines
2.3 KiB
Rust
|
// 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.
|
||
|
|
|
||
|
|
// Test that using the `vec!` macro nested within itself works when
|
||
|
|
// the contents implement Drop and we hit a panic in the middle of
|
||
|
|
// construction.
|
||
|
|
|
||
|
|
|
||
|
|
use std::thread;
|
||
|
|
use std::sync::atomic::{AtomicUsize, ATOMIC_USIZE_INIT, Ordering};
|
||
|
|
|
||
|
|
static LOG: AtomicUsize = ATOMIC_USIZE_INIT;
|
||
|
|
|
||
|
|
struct D(u8);
|
||
|
|
|
||
|
|
impl Drop for D {
|
||
|
|
fn drop(&mut self) {
|
||
|
|
println!("Dropping {}", self.0);
|
||
|
|
let old = LOG.load(Ordering::SeqCst);
|
||
|
|
LOG.compare_and_swap(old, old << 4 | self.0 as usize, Ordering::SeqCst);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
fn die() -> D { panic!("Oh no"); }
|
||
|
|
let g = thread::spawn(|| {
|
||
|
|
let _nested = vec![vec![D( 1), D( 2), D( 3), D( 4)],
|
||
|
|
vec![D( 5), D( 6), D( 7), D( 8)],
|
||
|
|
vec![D( 9), D(10), die(), D(12)],
|
||
|
|
vec![D(13), D(14), D(15), D(16)]];
|
||
|
|
});
|
||
|
|
assert!(g.join().is_err());
|
||
|
|
|
||
|
|
// When the panic occurs, we will be in the midst of constructing the
|
||
|
|
// second inner vector. Therefore, we drop the elements of the
|
||
|
|
// partially filled vector first, before we get around to dropping
|
||
|
|
// the elements of the filled vector.
|
||
|
|
|
||
|
|
// Issue 23222: The order in which the elements actually get
|
||
|
|
// dropped is a little funky: as noted above, we'll drop the 9+10
|
||
|
|
// first, but due to #23222, they get dropped in reverse
|
||
|
|
// order. Likewise, again due to #23222, we will drop the second
|
||
|
|
// filled vec before the first filled vec.
|
||
|
|
//
|
||
|
|
// If Issue 23222 is "fixed", then presumably the corrected
|
||
|
|
// expected order of events will be 0x__9_A__1_2_3_4__5_6_7_8;
|
||
|
|
// that is, we would still drop 9+10 first, since they belong to
|
||
|
|
// the more deeply nested expression when the panic occurs.
|
||
|
|
|
||
|
|
let expect = 0x__A_9__5_6_7_8__1_2_3_4;
|
||
|
|
let actual = LOG.load(Ordering::SeqCst);
|
||
|
|
assert!(actual == expect, "expect: 0x{:x} actual: 0x{:x}", expect, actual);
|
||
|
|
}
|