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// run-pass
// needs-unwind
#![allow(overflowing_literals)]
// Test that we cleanup a fixed size Box<[D; k]> properly when D has a
// destructor.
// ignore-emscripten no threads support
use std::thread;
use std::sync::atomic::{AtomicUsize, Ordering};
static LOG: AtomicUsize = AtomicUsize::new(0);
struct D(u8);
impl Drop for D {
fn drop(&mut self) {
println!("Dropping {}", self.0);
let old = LOG.load(Ordering::SeqCst);
let _ = LOG.compare_exchange(
old,
old << 4 | self.0 as usize,
Ordering::SeqCst,
Ordering::SeqCst
);
}
}
fn main() {
fn die() -> D { panic!("Oh no"); }
let g = thread::spawn(|| {
let _b1: Box<[D; 4]> = Box::new([D( 1), D( 2), D( 3), D( 4)]);
let _b2: Box<[D; 4]> = Box::new([D( 5), D( 6), D( 7), D( 8)]);
let _b3: Box<[D; 4]> = Box::new([D( 9), D(10), die(), D(12)]);
let _b4: Box<[D; 4]> = Box::new([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 input to `_b3`. Therefore, we drop the elements of the
// partially filled array first, before we get around to dropping
// the elements of `_b1` and _b2`.
// Issue 23222: The order in which the elements actually get
// dropped is a little funky. See similar notes in nested-vec-3;
// in essence, I would not be surprised if we change the ordering
// given in `expect` in the future.
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);
}
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