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Auto merge of #79485 - EllenNyan:stabilize_unsafe_cell_get_mut, r=m-ou-se

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Stabilize `unsafe_cell_get_mut`

Tracking issue: #76943

r? `@m-ou-se`
This commit is contained in:
bors 2020-12-18 11:39:26 +00:00
commit 6340607aca
2 changed files with 2 additions and 5 deletions
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6
library/core/src/cell.rs
View File

@ -1580,7 +1580,7 @@ impl<T: ?Sized + fmt::Display> fmt::Display for RefMut<'_, T> {
/// `&UnsafeCell<_>` reference); there is no magic whatsoever when dealing with _exclusive_
/// accesses (_e.g._, through an `&mut UnsafeCell<_>`): neither the cell nor the wrapped value
/// may be aliased for the duration of that `&mut` borrow.
/// This is showcased by the [`.get_mut()`] accessor, which is a non-`unsafe` getter that yields
/// This is showcased by the [`.get_mut()`] accessor, which is a _safe_ getter that yields
/// a `&mut T`.
///
/// [`.get_mut()`]: `UnsafeCell::get_mut`
@ -1618,7 +1618,6 @@ impl<T: ?Sized + fmt::Display> fmt::Display for RefMut<'_, T> {
/// implies exclusive access to its `T`:
///
/// ```rust
/// #![feature(unsafe_cell_get_mut)]
/// #![forbid(unsafe_code)] // with exclusive accesses,
/// // `UnsafeCell` is a transparent no-op wrapper,
/// // so no need for `unsafe` here.
@ -1722,7 +1721,6 @@ impl<T: ?Sized> UnsafeCell<T> {
/// # Examples
///
/// ```
/// #![feature(unsafe_cell_get_mut)]
/// use std::cell::UnsafeCell;
///
/// let mut c = UnsafeCell::new(5);
@ -1731,7 +1729,7 @@ impl<T: ?Sized> UnsafeCell<T> {
/// assert_eq!(*c.get_mut(), 6);
/// ```
#[inline]
#[unstable(feature = "unsafe_cell_get_mut", issue = "76943")]
#[stable(feature = "unsafe_cell_get_mut", since = "1.50.0")]
pub fn get_mut(&mut self) -> &mut T {
&mut self.value
}

1
library/std/src/lib.rs
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@ -325,7 +325,6 @@
#![feature(try_reserve)]
#![feature(unboxed_closures)]
#![feature(unsafe_block_in_unsafe_fn)]
#![feature(unsafe_cell_get_mut)]
#![feature(unsafe_cell_raw_get)]
#![feature(unwind_attributes)]
#![feature(vec_into_raw_parts)]