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Rollup merge of #130542 - ultrabear:stabilize_const_maybeuninit_as_mut_ptr, r=workingjubilee

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Stabilize const `MaybeUninit::as_mut_ptr`

This PR stabilizes the following APIs as const stable as of rust `1.83`:
```rs
impl<T> MaybeUninit<T> {
    pub const fn as_mut_ptr(&mut self) -> *mut T;
}
```
This is made possible by const_mut_refs being stabilized (yay).

FCP: #75251 [(comment)](https://github.com/rust-lang/rust/issues/75251#issuecomment-2356197443)
This commit is contained in:
Jubilee 2024-09-18 23:40:31 -07:00 • committed by GitHub
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4 changed files with 5 additions and 5 deletions
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1
library/alloc/src/lib.rs
View file

@ -110,7 +110,6 @@
#![feature(const_cow_is_borrowed)]
#![feature(const_eval_select)]
#![feature(const_heap)]
#![feature(const_maybe_uninit_as_mut_ptr)]
#![feature(const_maybe_uninit_write)]
#![feature(const_option)]
#![feature(const_pin)]

1
library/core/src/lib.rs
View file

@ -131,7 +131,6 @@
#![feature(const_ipv4)]
#![feature(const_ipv6)]
#![feature(const_likely)]
#![feature(const_maybe_uninit_as_mut_ptr)]
#![feature(const_maybe_uninit_assume_init)]
#![feature(const_nonnull_new)]
#![feature(const_num_midpoint)]

7
library/core/src/mem/maybe_uninit.rs
View file

@ -393,7 +393,6 @@ impl<T> MaybeUninit<T> {
// These are OK to allow since we do not leak &mut to user-visible API
#[rustc_allow_const_fn_unstable(const_mut_refs)]
#[rustc_allow_const_fn_unstable(const_ptr_write)]
#[rustc_allow_const_fn_unstable(const_maybe_uninit_as_mut_ptr)]
#[rustc_const_stable(feature = "const_maybe_uninit_zeroed", since = "1.75.0")]
pub const fn zeroed() -> MaybeUninit<T> {
let mut u = MaybeUninit::<T>::uninit();
@ -570,7 +569,11 @@ impl<T> MaybeUninit<T> {
/// (Notice that the rules around references to uninitialized data are not finalized yet, but
/// until they are, it is advisable to avoid them.)
#[stable(feature = "maybe_uninit", since = "1.36.0")]
#[rustc_const_unstable(feature = "const_maybe_uninit_as_mut_ptr", issue = "75251")]
#[rustc_const_stable(
feature = "const_maybe_uninit_as_mut_ptr",
since = "CURRENT_RUSTC_VERSION"
)]
#[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_mut_refs))]
#[inline(always)]
pub const fn as_mut_ptr(&mut self) -> *mut T {
// `MaybeUninit` and `ManuallyDrop` are both `repr(transparent)` so we can cast the pointer.

1
library/core/tests/lib.rs
View file

@ -26,7 +26,6 @@
#![feature(const_ipv4)]
#![feature(const_ipv6)]
#![feature(const_likely)]
#![feature(const_maybe_uninit_as_mut_ptr)]
#![feature(const_nonnull_new)]
#![feature(const_option)]
#![feature(const_option_ext)]