Auto merge of #67670 - oli-obk:rollup-2dp08sd, r=oli-obk

Rollup of 15 pull requests

Successful merges:

 - #65244 (add IntoFuture trait and support for await)
 - #67576 (reuse `capacity` variable in slice::repeat)
 - #67588 (Use NonNull in slice::Iter and slice::IterMut.)
 - #67594 (Update libc to 0.2.66)
 - #67602 (Use issue = "none" instead of "0" in intrinsics)
 - #67604 (Add Scalar::to_(u|i)16 methods)
 - #67617 (Remove `compiler_builtins_lib` documentation)
 - #67621 (Use the correct type for static qualifs)
 - #67629 (Remove redundant link texts)
 - #67632 (Convert collapsed to shortcut reference links)
 - #67633 (Update .mailmap)
 - #67635 (Document safety of Path casting)
 - #67654 (Add regression test for old NLL ICE)
 - #67659 (Stabilize the `matches!` macro)
 - #67664 (Fix some mailmap entries)

Failed merges:

r? @ghost

Author: bors

Diff for: .mailmap

@@ -54,9 +54,10 @@ Chris C Cerami <chrisccerami@users.noreply.github.com> Chris C Cerami <chrisccer
 Chris Pressey <cpressey@gmail.com>
 Chris Thorn <chris@thorn.co> Chris Thorn <thorn@thoughtbot.com>
 Chris Vittal <christopher.vittal@gmail.com> Christopher Vittal <christopher.vittal@gmail.com>
-Christian Poveda <christianpoveda@protonmail.com> <cn.poveda.ruiz@gmail.com>
-Christian Poveda <christianpoveda@protonmail.com> <z1mvader@protonmail.com>
-Christian Poveda <christianpoveda@protonmail.com> <cpovedar@fnal.gov>
+Christian Poveda <git@christianpoveda.xyz> <christianpoveda@protonmail.com>
+Christian Poveda <git@christianpoveda.xyz> <cn.poveda.ruiz@gmail.com>
+Christian Poveda <git@christianpoveda.xyz> <z1mvader@protonmail.com>
+Christian Poveda <git@christianpoveda.xyz> <cpovedar@fnal.gov>
 Clark Gaebel <cg.wowus.cg@gmail.com> <cgaebel@mozilla.com>
 Clinton Ryan <clint.ryan3@gmail.com>
 Corey Richardson <corey@octayn.net> Elaine "See More" Nemo <corey@octayn.net>
@@ -154,6 +155,7 @@ Lindsey Kuper <lindsey@composition.al> <lkuper@mozilla.com>
 Luke Metz <luke.metz@students.olin.edu>
 Luqman Aden <me@luqman.ca> <laden@csclub.uwaterloo.ca>
 Luqman Aden <me@luqman.ca> <laden@mozilla.com>
+Manish Goregaokar <manishsmail@gmail.com>
 Marcell Pardavi <marcell.pardavi@gmail.com>
 Margaret Meyerhofer <mmeyerho@andrew.cmu.edu> <mmeyerho@andrew>
 Mark Rousskov <mark.simulacrum@gmail.com>
@@ -185,6 +187,7 @@ Neil Pankey <npankey@gmail.com> <neil@wire.im>
 Nick Platt <platt.nicholas@gmail.com>
 Nicole Mazzuca <npmazzuca@gmail.com>
 Nif Ward <nif.ward@gmail.com>
+Nika Layzell <michael@thelayzells.com>
 Oliver Middleton <olliemail27@gmail.com> <ollie27@users.noreply.github.com>
 Oliver Scherer <oliver.schneider@kit.edu> <git-spam-no-reply9815368754983@oli-obk.de>
 Oliver Scherer <oliver.schneider@kit.edu> <git-spam9815368754983@oli-obk.de>
@@ -204,7 +207,6 @@ Paul Faria <paul_faria@ultimatesoftware.com> Paul Faria <Nashenas88@gmail.com>
 Peer Aramillo Irizar <peer.aramillo.irizar@gmail.com> parir <peer.aramillo.irizar@gmail.com>
 Peter Elmers <peter.elmers@yahoo.com> <peter.elmers@rice.edu>
 Peter Liniker <peter.liniker+github@gmail.com>
-Peter Zotov <whitequark@whitequark.org>
 Phil Dawes <phil@phildawes.net> Phil Dawes <pdawes@drw.com>
 Philipp Brüschweiler <blei42@gmail.com> <blei42@gmail.com>
 Philipp Brüschweiler <blei42@gmail.com> <bruphili@student.ethz.ch>
@@ -255,6 +257,7 @@ Ulrik Sverdrup <bluss@users.noreply.github.com> Ulrik Sverdrup <root@localhost>
 Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
 Vadim Petrochenkov <vadim.petrochenkov@gmail.com> petrochenkov <vadim.petrochenkov@gmail.com>
 Vitali Haravy <HumaneProgrammer@gmail.com> Vitali Haravy <humaneprogrammer@gmail.com>
+whitequark <whitequark@whitequark.org>
 William Ting <io@williamting.com> <william.h.ting@gmail.com>
 Xuefeng Wu <benewu@gmail.com> Xuefeng Wu <xfwu@thoughtworks.com>
 Xuefeng Wu <benewu@gmail.com> XuefengWu <benewu@gmail.com>

Diff for: CONTRIBUTING.md

@@ -367,7 +367,7 @@ labels to triage issues:
   to fix the issue.
 
 * The dark blue **final-comment-period** label marks bugs that are using the
-  RFC signoff functionality of [rfcbot][rfcbot] and are currently in the final
+  RFC signoff functionality of [rfcbot] and are currently in the final
   comment period.
 
 * Red, **I**-prefixed labels indicate the **importance** of the issue. The
@@ -385,7 +385,7 @@ labels to triage issues:
   label.
 
 * The gray **proposed-final-comment-period** label marks bugs that are using
-  the RFC signoff functionality of [rfcbot][rfcbot] and are currently awaiting
+  the RFC signoff functionality of [rfcbot] and are currently awaiting
   signoff of all team members in order to enter the final comment period.
 
 * Pink, **regression**-prefixed labels track regressions from stable to the

Diff for: Cargo.lock

@@ -1773,9 +1773,9 @@ checksum = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
 
 [[package]]
 name = "libc"
-version = "0.2.64"
+version = "0.2.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74dfca3d9957906e8d1e6a0b641dc9a59848e793f1da2165889fd4f62d10d79c"
+checksum = "d515b1f41455adea1313a4a2ac8a8a477634fbae63cc6100e3aebb207ce61558"
 dependencies = [
  "rustc-std-workspace-core",
 ]

Diff for: RELEASES.md

@@ -4951,10 +4951,10 @@ Stabilized APIs
 ---------------
 
 * [`std::panic`]
-* [`std::panic::catch_unwind`][] (renamed from `recover`)
-* [`std::panic::resume_unwind`][] (renamed from `propagate`)
-* [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
-* [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
+* [`std::panic::catch_unwind`] (renamed from `recover`)
+* [`std::panic::resume_unwind`] (renamed from `propagate`)
+* [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
+* [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
 * [`str::is_char_boundary`]
 * [`<*const T>::as_ref`]
 * [`<*mut T>::as_ref`]
@@ -5234,18 +5234,18 @@ Libraries
 ---------
 
 * Stabilized APIs:
-  * [`str::encode_utf16`][] (renamed from `utf16_units`)
-  * [`str::EncodeUtf16`][] (renamed from `Utf16Units`)
+  * [`str::encode_utf16`] (renamed from `utf16_units`)
+  * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
   * [`Ref::map`]
   * [`RefMut::map`]
   * [`ptr::drop_in_place`]
   * [`time::Instant`]
   * [`time::SystemTime`]
   * [`Instant::now`]
-  * [`Instant::duration_since`][] (renamed from `duration_from_earlier`)
+  * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
   * [`Instant::elapsed`]
   * [`SystemTime::now`]
-  * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`)
+  * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
   * [`SystemTime::elapsed`]
   * Various `Add`/`Sub` impls for `Time` and `SystemTime`
   * [`SystemTimeError`]
@@ -5432,8 +5432,8 @@ Libraries
 
 * Stabilized APIs
   * `Path`
-    * [`Path::strip_prefix`][] (renamed from relative_from)
-    * [`path::StripPrefixError`][] (new error type returned from strip_prefix)
+    * [`Path::strip_prefix`] (renamed from relative_from)
+    * [`path::StripPrefixError`] (new error type returned from strip_prefix)
   * `Ipv4Addr`
     * [`Ipv4Addr::is_loopback`]
     * [`Ipv4Addr::is_private`]
@@ -5646,7 +5646,7 @@ Libraries
 
 * Stabilized APIs:
   [`Read::read_exact`],
-  [`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
+  [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
   [`fs::DirBuilder`], [`fs::DirBuilder::new`],
   [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
   [`os::unix::fs::DirBuilderExt`],
@@ -5659,11 +5659,11 @@ Libraries
   [`collections::hash_set::HashSet::drain`],
   [`collections::binary_heap::Drain`],
   [`collections::binary_heap::BinaryHeap::drain`],
-  [`Vec::extend_from_slice`][] (renamed from `push_all`),
+  [`Vec::extend_from_slice`] (renamed from `push_all`),
   [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
   [`RwLock::into_inner`],
-  [`Iterator::min_by_key`][] (renamed from `min_by`),
-  [`Iterator::max_by_key`][] (renamed from `max_by`).
+  [`Iterator::min_by_key`] (renamed from `min_by`),
+  [`Iterator::max_by_key`] (renamed from `max_by`).
 * The [core library][1.6co] is stable, as are most of its APIs.
 * [The `assert_eq!` macro supports arguments that don't implement
   `Sized`][1.6ae], such as arrays. In this way it behaves more like

Diff for: src/doc/unstable-book/src/language-features/lang-items.md

@@ -188,11 +188,7 @@ pub extern fn rust_begin_panic(info: &PanicInfo) -> ! {
 
 In many cases, you may need to manually link to the `compiler_builtins` crate
 when building a `no_std` binary. You may observe this via linker error messages
-such as "```undefined reference to `__rust_probestack'```". Using this crate
-also requires enabling the library feature `compiler_builtins_lib`. You can read
-more about this [here][compiler-builtins-lib].
-
-[compiler-builtins-lib]: ../library-features/compiler-builtins-lib.md
+such as "```undefined reference to `__rust_probestack'```".
 
 ## More about the language items
 

Diff for: src/doc/unstable-book/src/library-features/compiler-builtins-lib.md

@@ -1094,7 +1094,7 @@ impl<T> FusedIterator for Iter<'_, T> {}
 
 /// An owning iterator over the elements of a `BinaryHeap`.
 ///
-/// This `struct` is created by the [`into_iter`] method on [`BinaryHeap`][`BinaryHeap`]
+/// This `struct` is created by the [`into_iter`] method on [`BinaryHeap`]
 /// (provided by the `IntoIterator` trait). See its documentation for more.
 ///
 /// [`into_iter`]: struct.BinaryHeap.html#method.into_iter

Diff for: src/liballoc/collections/binary_heap.rs

@@ -283,7 +283,7 @@ pub struct IterMut<'a, K: 'a, V: 'a> {
 
 /// An owning iterator over the entries of a `BTreeMap`.
 ///
-/// This `struct` is created by the [`into_iter`] method on [`BTreeMap`][`BTreeMap`]
+/// This `struct` is created by the [`into_iter`] method on [`BTreeMap`]
 /// (provided by the `IntoIterator` trait). See its documentation for more.
 ///
 /// [`into_iter`]: struct.BTreeMap.html#method.into_iter

Diff for: src/liballoc/collections/btree/map.rs

@@ -83,7 +83,7 @@ impl<T: fmt::Debug> fmt::Debug for Iter<'_, T> {
 
 /// An owning iterator over the items of a `BTreeSet`.
 ///
-/// This `struct` is created by the [`into_iter`] method on [`BTreeSet`][`BTreeSet`]
+/// This `struct` is created by the [`into_iter`] method on [`BTreeSet`]
 /// (provided by the `IntoIterator` trait). See its documentation for more.
 ///
 /// [`BTreeSet`]: struct.BTreeSet.html

Diff for: src/liballoc/collections/btree/set.rs

@@ -105,7 +105,7 @@ impl<T: fmt::Debug> fmt::Debug for IterMut<'_, T> {
 
 /// An owning iterator over the elements of a `LinkedList`.
 ///
-/// This `struct` is created by the [`into_iter`] method on [`LinkedList`][`LinkedList`]
+/// This `struct` is created by the [`into_iter`] method on [`LinkedList`]
 /// (provided by the `IntoIterator` trait). See its documentation for more.
 ///
 /// [`into_iter`]: struct.LinkedList.html#method.into_iter

Diff for: src/liballoc/collections/linked_list.rs

@@ -2474,7 +2474,7 @@ impl<T> FusedIterator for IterMut<'_, T> {}
 
 /// An owning iterator over the elements of a `VecDeque`.
 ///
-/// This `struct` is created by the [`into_iter`] method on [`VecDeque`][`VecDeque`]
+/// This `struct` is created by the [`into_iter`] method on [`VecDeque`]
 /// (provided by the `IntoIterator` trait). See its documentation for more.
 ///
 /// [`into_iter`]: struct.VecDeque.html#method.into_iter

Diff for: src/liballoc/collections/vec_deque.rs

@@ -330,7 +330,7 @@
 //!
 //! Additionally, the return value of this function is [`fmt::Result`] which is a
 //! type alias of [`Result`]`<(), `[`std::fmt::Error`]`>`. Formatting implementations
-//! should ensure that they propagate errors from the [`Formatter`][`Formatter`] (e.g., when
+//! should ensure that they propagate errors from the [`Formatter`] (e.g., when
 //! calling [`write!`]). However, they should never return errors spuriously. That
 //! is, a formatting implementation must and may only return an error if the
 //! passed-in [`Formatter`] returns an error. This is because, contrary to what

Diff for: src/liballoc/fmt.rs

@@ -450,7 +450,8 @@ impl<T> [T] {
         // and `rem` is the remaining part of `n`.
 
         // Using `Vec` to access `set_len()`.
-        let mut buf = Vec::with_capacity(self.len().checked_mul(n).expect("capacity overflow"));
+        let capacity = self.len().checked_mul(n).expect("capacity overflow");
+        let mut buf = Vec::with_capacity(capacity);
 
         // `2^expn` repetition is done by doubling `buf` `expn`-times.
         buf.extend(self);
@@ -476,7 +477,7 @@ impl<T> [T] {
 
         // `rem` (`= n - 2^expn`) repetition is done by copying
         // first `rem` repetitions from `buf` itself.
-        let rem_len = self.len() * n - buf.len(); // `self.len() * rem`
+        let rem_len = capacity - buf.len(); // `self.len() * rem`
         if rem_len > 0 {
             // `buf.extend(buf[0 .. rem_len])`:
             unsafe {
@@ -487,8 +488,7 @@ impl<T> [T] {
                     rem_len,
                 );
                 // `buf.len() + rem_len` equals to `buf.capacity()` (`= self.len() * n`).
-                let buf_cap = buf.capacity();
-                buf.set_len(buf_cap);
+                buf.set_len(capacity);
             }
         }
         buf

Diff for: src/liballoc/slice.rs

@@ -242,7 +242,7 @@ use crate::raw_vec::RawVec;
 /// ensures no unnecessary allocations or deallocations occur. Emptying a `Vec`
 /// and then filling it back up to the same [`len`] should incur no calls to
 /// the allocator. If you wish to free up unused memory, use
-/// [`shrink_to_fit`][`shrink_to_fit`].
+/// [`shrink_to_fit`].
 ///
 /// [`push`] and [`insert`] will never (re)allocate if the reported capacity is
 /// sufficient. [`push`] and [`insert`] *will* (re)allocate if
@@ -2461,7 +2461,7 @@ where
 
 /// An iterator that moves out of a vector.
 ///
-/// This `struct` is created by the `into_iter` method on [`Vec`][`Vec`] (provided
+/// This `struct` is created by the `into_iter` method on [`Vec`] (provided
 /// by the [`IntoIterator`] trait).
 ///
 /// [`Vec`]: struct.Vec.html

Diff for: src/liballoc/vec.rs

@@ -99,6 +99,21 @@ pub trait Future {
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>;
 }
 
+/// Conversion into a `Future`.
+#[unstable(feature = "into_future", issue = "67644")]
+pub trait IntoFuture {
+    /// The output that the future will produce on completion.
+    #[unstable(feature = "into_future", issue = "67644")]
+    type Output;
+    /// Which kind of future are we turning this into?
+    #[unstable(feature = "into_future", issue = "67644")]
+    type Future: Future<Output = Self::Output>;
+
+    /// Creates a future from a value.
+    #[unstable(feature = "into_future", issue = "67644")]
+    fn into_future(self) -> Self::Future;
+}
+
 #[stable(feature = "futures_api", since = "1.36.0")]
 impl<F: ?Sized + Future + Unpin> Future for &mut F {
     type Output = F::Output;
@@ -119,3 +134,13 @@ where
         Pin::get_mut(self).as_mut().poll(cx)
     }
 }
+
+#[unstable(feature = "into_future", issue = "67644")]
+impl<F: Future> IntoFuture for F {
+    type Output = F::Output;
+    type Future = F;
+
+    fn into_future(self) -> Self::Future {
+        self
+    }
+}

Diff for: src/libcore/future/future.rs

@@ -5,3 +5,6 @@
 mod future;
 #[stable(feature = "futures_api", since = "1.36.0")]
 pub use self::future::Future;
+
+#[unstable(feature = "into_future", issue = "67644")]
+pub use self::future::IntoFuture;

Diff for: src/libcore/future/mod.rs

@@ -697,7 +697,7 @@ extern "rust-intrinsic" {
 
     #[rustc_const_stable(feature = "const_min_align_of", since = "1.40.0")]
     pub fn min_align_of<T>() -> usize;
-    #[rustc_const_unstable(feature = "const_pref_align_of", issue = "0")]
+    #[rustc_const_unstable(feature = "const_pref_align_of", issue = "none")]
     pub fn pref_align_of<T>() -> usize;
 
     /// The size of the referenced value in bytes.
@@ -708,13 +708,13 @@ extern "rust-intrinsic" {
     pub fn min_align_of_val<T: ?Sized>(_: &T) -> usize;
 
     /// Gets a static string slice containing the name of a type.
-    #[rustc_const_unstable(feature = "const_type_name", issue = "0")]
+    #[rustc_const_unstable(feature = "const_type_name", issue = "none")]
     pub fn type_name<T: ?Sized>() -> &'static str;
 
     /// Gets an identifier which is globally unique to the specified type. This
     /// function will return the same value for a type regardless of whichever
     /// crate it is invoked in.
-    #[rustc_const_unstable(feature = "const_type_id", issue = "0")]
+    #[rustc_const_unstable(feature = "const_type_id", issue = "none")]
     pub fn type_id<T: ?Sized + 'static>() -> u64;
 
     /// A guard for unsafe functions that cannot ever be executed if `T` is uninhabited:
@@ -1222,7 +1222,7 @@ extern "rust-intrinsic" {
     /// let num_leading = unsafe { ctlz_nonzero(x) };
     /// assert_eq!(num_leading, 3);
     /// ```
-    #[rustc_const_unstable(feature = "constctlz", issue = "0")]
+    #[rustc_const_unstable(feature = "constctlz", issue = "none")]
     pub fn ctlz_nonzero<T>(x: T) -> T;
 
     /// Returns the number of trailing unset bits (zeroes) in an integer type `T`.
@@ -1267,7 +1267,7 @@ extern "rust-intrinsic" {
     /// let num_trailing = unsafe { cttz_nonzero(x) };
     /// assert_eq!(num_trailing, 3);
     /// ```
-    #[rustc_const_unstable(feature = "const_cttz", issue = "0")]
+    #[rustc_const_unstable(feature = "const_cttz", issue = "none")]
     pub fn cttz_nonzero<T>(x: T) -> T;
 
     /// Reverses the bytes in an integer type `T`.
@@ -1396,7 +1396,7 @@ extern "rust-intrinsic" {
     pub fn nontemporal_store<T>(ptr: *mut T, val: T);
 
     /// See documentation of `<*const T>::offset_from` for details.
-    #[rustc_const_unstable(feature = "const_ptr_offset_from", issue = "0")]
+    #[rustc_const_unstable(feature = "const_ptr_offset_from", issue = "none")]
     pub fn ptr_offset_from<T>(ptr: *const T, base: *const T) -> isize;
 
     /// Internal hook used by Miri to implement unwinding.