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Rollup merge of #91851 - woppopo:const_maybeuninit_zeroed, r=yaahc

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Make `MaybeUninit::zeroed` `const`

Tracking issue: #91850

```rust
// core::mem
impl<T> MaybeUninit<T> {
    pub const fn zeroed() -> MaybeUninit<T>;
}
```
This commit is contained in:
Matthias Krüger 2021-12-14 10:21:04 +01:00 • committed by GitHub
commit 75e8d65ccd
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3
library/core/src/mem/maybe_uninit.rs
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@ -394,10 +394,11 @@ impl<T> MaybeUninit<T> {
/// // This is undefined behavior. ⚠️
/// ```
#[stable(feature = "maybe_uninit", since = "1.36.0")]
#[rustc_const_unstable(feature = "const_maybe_uninit_zeroed", issue = "91850")]
#[must_use]
#[inline]
#[rustc_diagnostic_item = "maybe_uninit_zeroed"]
pub fn zeroed() -> MaybeUninit<T> {
pub const fn zeroed() -> MaybeUninit<T> {
let mut u = MaybeUninit::<T>::uninit();
// SAFETY: `u.as_mut_ptr()` points to allocated memory.
unsafe {