Add tests
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@ -16,3 +16,39 @@ fn unitialized_zero_size_box() {
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NonNull::<MaybeUninit<String>>::dangling().as_ptr(),
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);
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}
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#[derive(Clone, PartialEq, Eq, Debug)]
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struct Dummy {
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_data: u8,
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}
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#[test]
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fn box_clone_and_clone_from_equivalence() {
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for size in (0..8).map(|i| 2usize.pow(i)) {
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let control = vec![Dummy { _data: 42 }; size].into_boxed_slice();
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let clone = control.clone();
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let mut copy = vec![Dummy { _data: 84 }; size].into_boxed_slice();
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copy.clone_from(&control);
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assert_eq!(control, clone);
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assert_eq!(control, copy);
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}
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}
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#[test]
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fn box_clone_from_ptr_stability() {
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for size in (0..8).map(|i| 2usize.pow(i)) {
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let control = vec![Dummy { _data: 42 }; size].into_boxed_slice();
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let mut copy = vec![Dummy { _data: 84 }; size].into_boxed_slice();
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let copy_raw = copy.as_ptr() as usize;
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copy.clone_from(&control);
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assert_eq!(copy.as_ptr() as usize, copy_raw);
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}
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for size in (0..8).map(|i| 2usize.pow(i)) {
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let control = vec![Dummy { _data: 42 }; size].into_boxed_slice();
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let mut copy = vec![Dummy { _data: 84 }; size + 1].into_boxed_slice();
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let copy_raw = copy.as_ptr() as usize;
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copy.clone_from(&control);
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assert_ne!(copy.as_ptr() as usize, copy_raw);
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}
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}
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