Auto merge of rust-lang#97574 - Dylan-DPC:rollup-jq850l6, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - rust-lang#97089 (Improve settings theme display)
 - rust-lang#97229 (Document the current aliasing rules for `Box<T>`.)
 - rust-lang#97371 (Suggest adding a semicolon to a closure without block)
 - rust-lang#97455 (Stabilize `toowned_clone_into`)
 - rust-lang#97565 (Add doc alias `memset` to `write_bytes`)
 - rust-lang#97569 (Remove `memset` alias from `fill_with`.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

alloc/src/borrow.rs

@@ -67,14 +67,13 @@ pub trait ToOwned {
     /// Basic usage:
     ///
     /// ```
-    /// # #![feature(toowned_clone_into)]
     /// let mut s: String = String::new();
     /// "hello".clone_into(&mut s);
     ///
     /// let mut v: Vec<i32> = Vec::new();
     /// [1, 2][..].clone_into(&mut v);
     /// ```
-    #[unstable(feature = "toowned_clone_into", reason = "recently added", issue = "41263")]
+    #[stable(feature = "toowned_clone_into", since = "1.63.0")]
     fn clone_into(&self, target: &mut Self::Owned) {
         *target = self.to_owned();
     }

alloc/src/boxed.rs

@@ -122,7 +122,21 @@
 //! definition is just using `T*` can lead to undefined behavior, as
 //! described in [rust-lang/unsafe-code-guidelines#198][ucg#198].
 //!
+//! # Considerations for unsafe code
+//!
+//! **Warning: This section is not normative and is subject to change, possibly
+//! being relaxed in the future! It is a simplified summary of the rules
+//! currently implemented in the compiler.**
+//!
+//! The aliasing rules for `Box<T>` are the same as for `&mut T`. `Box<T>`
+//! asserts uniqueness over its content. Using raw pointers derived from a box
+//! after that box has been mutated through, moved or borrowed as `&mut T`
+//! is not allowed. For more guidance on working with box from unsafe code, see
+//! [rust-lang/unsafe-code-guidelines#326][ucg#326].
+//!
+//!
 //! [ucg#198]: https://github.com/rust-lang/unsafe-code-guidelines/issues/198
+//! [ucg#326]: https://github.com/rust-lang/unsafe-code-guidelines/issues/326
 //! [dereferencing]: core::ops::Deref
 //! [`Box::<T>::from_raw(value)`]: Box::from_raw
 //! [`Global`]: crate::alloc::Global

core/src/intrinsics.rs

@@ -2287,6 +2287,7 @@ pub const unsafe fn copy<T>(src: *const T, dst: *mut T, count: usize) {
 /// // Now the box is fine
 /// assert_eq!(*v, 42);
 /// ```
+#[doc(alias = "memset")]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")]
 #[inline]

core/src/ptr/mut_ptr.rs

@@ -1412,6 +1412,7 @@ impl<T: ?Sized> *mut T {
     /// See [`ptr::write_bytes`] for safety concerns and examples.
     ///
     /// [`ptr::write_bytes`]: crate::ptr::write_bytes()
+    #[doc(alias = "memset")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")]
     #[inline(always)]

core/src/slice/mod.rs

@@ -3083,7 +3083,6 @@ impl<T> [T] {
     /// buf.fill_with(Default::default);
     /// assert_eq!(buf, vec![0; 10]);
     /// ```
-    #[doc(alias = "memset")]
     #[stable(feature = "slice_fill_with", since = "1.51.0")]
     pub fn fill_with<F>(&mut self, mut f: F)
     where

std/src/lib.rs

@@ -299,7 +299,6 @@
 #![feature(map_try_insert)]
 #![feature(new_uninit)]
 #![feature(thin_box)]
-#![feature(toowned_clone_into)]
 #![feature(try_reserve_kind)]
 #![feature(vec_into_raw_parts)]
 #![feature(slice_concat_trait)]