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Fix assertion in MaybeUninit::array_assume_init() for zero-length arrays #81412

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Merged
merged 1 commit into from Jan 26, 2021
Merged

Fix assertion in MaybeUninit::array_assume_init() for zero-length arrays #81412

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2 changes: 1 addition & 1 deletion library/core/src/mem/maybe_uninit.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -839,7 +839,7 @@ impl<T> MaybeUninit<T> {
// * MaybeUnint does not drop, so there are no double-frees
// And thus the conversion is safe
unsafe {
intrinsics::assert_inhabited::<T>();
intrinsics::assert_inhabited::<[T; N]>();
(&array as *const _ as *const [T; N]).read()
}
}
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2 changes: 2 additions & 0 deletions library/core/tests/mem.rs
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Expand Up @@ -152,6 +152,8 @@ fn uninit_array_assume_init() {
let array = unsafe { MaybeUninit::array_assume_init(array) };

assert_eq!(array, [3, 1, 4, 1, 5]);

let [] = unsafe { MaybeUninit::<!>::array_assume_init([]) };
}

#[test]
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