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Rollup merge of #130214 - RalfJung:zeroed, r=Mark-Simulacrum

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MaybeUninit::zeroed: mention that padding is not zeroed

That should clarify cases like [this](https://github.com/rust-lang/rust/pull/129778#issuecomment-2342542847).
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Stuart Cook 2024-09-15 12:14:56 +10:00 committed by GitHub
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library/core/src/mem/maybe_uninit.rs
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@ -351,6 +351,9 @@ impl<T> MaybeUninit<T> {
/// but `MaybeUninit<&'static i32>::zeroed()` is not because references must not
/// be null.
///
/// Note that if `T` has padding bytes, those bytes are *not* preserved when the
/// `MaybeUninit<T>` value is returned from this function, so those bytes will *not* be zeroed.
///
/// Note that dropping a `MaybeUninit<T>` will never call `T`'s drop code.
/// It is your responsibility to make sure `T` gets dropped if it got initialized.
///