1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // ignore-emscripten no threads support
13 // Test that using the `vec!` macro nested within itself works when
14 // the contents implement Drop and we hit a panic in the middle of
20 use std::sync::atomic::{AtomicUsize, Ordering};
22 static LOG: AtomicUsize = AtomicUsize::new(0);
28 println!("Dropping {}", self.0);
29 let old = LOG.load(Ordering::SeqCst);
30 LOG.compare_and_swap(old, old << 4 | self.0 as usize, Ordering::SeqCst);
35 fn die() -> D { panic!("Oh no"); }
36 let g = thread::spawn(|| {
37 let _nested = vec![vec![D( 1), D( 2), D( 3), D( 4)],
38 vec![D( 5), D( 6), D( 7), D( 8)],
39 vec![D( 9), D(10), die(), D(12)],
40 vec![D(13), D(14), D(15), D(16)]];
42 assert!(g.join().is_err());
44 // When the panic occurs, we will be in the midst of constructing the
45 // second inner vector. Therefore, we drop the elements of the
46 // partially filled vector first, before we get around to dropping
47 // the elements of the filled vector.
49 // Issue 23222: The order in which the elements actually get
50 // dropped is a little funky: as noted above, we'll drop the 9+10
51 // first, but due to #23222, they get dropped in reverse
52 // order. Likewise, again due to #23222, we will drop the second
53 // filled vec before the first filled vec.
55 // If Issue 23222 is "fixed", then presumably the corrected
56 // expected order of events will be 0x__9_A__1_2_3_4__5_6_7_8;
57 // that is, we would still drop 9+10 first, since they belong to
58 // the more deeply nested expression when the panic occurs.
60 let expect = 0x__A_9__5_6_7_8__1_2_3_4;
61 let actual = LOG.load(Ordering::SeqCst);
62 assert!(actual == expect, "expect: 0x{:x} actual: 0x{:x}", expect, actual);