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Rollup merge of #131713 - tgross35:stabilize-const_maybe_uninit_write, r=RalfJung,dtolnay

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Stabilize `const_maybe_uninit_write`

Mark the following API const stable:

```rust
impl<T> MaybeUninit<T> {
    pub const fn write(&mut self, val: T) -> &mut T;
}
```

This depends on `const_mut_refs` and [`const_maybe_uninit_assume_init`](https://github.com/rust-lang/rust/issues/86722), both of which have recently been stabilized.

Closes: <https://github.com/rust-lang/rust/issues/63567>
This commit is contained in:
Guillaume Gomez 2024-12-02 23:08:52 +01:00 committed by GitHub
commit e56e68541b
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4
library/core/src/mem/maybe_uninit.rs
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@ -485,9 +485,9 @@ impl<T> MaybeUninit<T> {
/// }
/// }
/// ```
#[stable(feature = "maybe_uninit_write", since = "1.55.0")]
#[rustc_const_unstable(feature = "const_maybe_uninit_write", issue = "63567")]
#[inline(always)]
#[stable(feature = "maybe_uninit_write", since = "1.55.0")]
#[rustc_const_stable(feature = "const_maybe_uninit_write", since = "CURRENT_RUSTC_VERSION")]
pub const fn write(&mut self, val: T) -> &mut T {
*self = MaybeUninit::new(val);
// SAFETY: We just initialized this value.