Add tests for 'impl Default for [T; N]'
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@ -241,3 +241,44 @@ fn iterator_drops() {
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}
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assert_eq!(i.get(), 5);
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}
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#[test]
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fn array_default_impl_avoids_leaks_on_panic() {
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use core::sync::atomic::{AtomicUsize, Ordering::Relaxed};
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static COUNTER: AtomicUsize = AtomicUsize::new(0);
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#[derive(Debug)]
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struct Bomb(usize);
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impl Default for Bomb {
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fn default() -> Bomb {
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if COUNTER.load(Relaxed) == 3 {
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panic!("bomb limit exceeded");
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}
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COUNTER.fetch_add(1, Relaxed);
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Bomb(COUNTER.load(Relaxed))
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}
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}
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impl Drop for Bomb {
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fn drop(&mut self) {
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COUNTER.fetch_sub(1, Relaxed);
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}
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}
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let res = std::panic::catch_unwind(|| <[Bomb; 5]>::default());
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let panic_msg = match res {
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Ok(_) => unreachable!(),
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Err(p) => p.downcast::<&'static str>().unwrap(),
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};
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assert_eq!(*panic_msg, "bomb limit exceeded");
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// check that all bombs are successfully dropped
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assert_eq!(COUNTER.load(Relaxed), 0);
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}
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#[test]
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fn empty_array_is_always_default() {
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struct DoesNotImplDefault;
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let _arr = <[DoesNotImplDefault; 0]>::default();
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}
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