]>
git.proxmox.com Git - rustc.git/blob - tests/ui/array-slice-vec/nested-vec-3.rs
3 #![allow(overflowing_literals)]
5 // ignore-emscripten no threads support
7 // Test that using the `vec!` macro nested within itself works when
8 // the contents implement Drop and we hit a panic in the middle of
12 use std
::sync
::atomic
::{AtomicUsize, Ordering}
;
14 static LOG
: AtomicUsize
= AtomicUsize
::new(0);
20 println
!("Dropping {}", self.0);
21 let old
= LOG
.load(Ordering
::SeqCst
);
22 let _
= LOG
.compare_exchange(
24 old
<< 4 | self.0 as usize,
32 fn die() -> D { panic!("Oh no"); }
33 let g
= thread
::spawn(|| {
34 let _nested
= vec
![vec
![D( 1), D( 2), D( 3), D( 4)],
35 vec
![D( 5), D( 6), D( 7), D( 8)],
36 vec
![D( 9), D(10), die(), D(12)],
37 vec
![D(13), D(14), D(15), D(16)]];
39 assert
!(g
.join().is_err());
41 // When the panic occurs, we will be in the midst of constructing the
42 // second inner vector. Therefore, we drop the elements of the
43 // partially filled vector first, before we get around to dropping
44 // the elements of the filled vector.
46 // Issue 23222: The order in which the elements actually get
47 // dropped is a little funky: as noted above, we'll drop the 9+10
48 // first, but due to #23222, they get dropped in reverse
49 // order. Likewise, again due to #23222, we will drop the second
50 // filled vec before the first filled vec.
52 // If Issue 23222 is "fixed", then presumably the corrected
53 // expected order of events will be 0x__9_A__1_2_3_4__5_6_7_8;
54 // that is, we would still drop 9+10 first, since they belong to
55 // the more deeply nested expression when the panic occurs.
57 let expect
= 0x__A_9__5_6_7_8__1_2_3_4;
58 let actual
= LOG
.load(Ordering
::SeqCst
);
59 assert
!(actual
== expect
, "expect: 0x{:x} actual: 0x{:x}", expect
, actual
);