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