Auto merge of #137046 - workingjubilee:rollup-u56aw1m, r=workingjubilee

Rollup of 10 pull requests

Successful merges:

 - #133312 (triagebot: automatically add more rustdoc related labels)
 - #134016 (Stabilize `const_is_char_boundary` and `const_str_split_at`.)
 - #136971 (Add a new check-pass UI test for returning `impl Fn(T) -> impl Trait`)
 - #136983 (Prepare standard library for Rust 2024 migration)
 - #137002 (Fix early lint check desc in query)
 - #137006 (borrowck diagnostics cleanup: remove an unused and a barely-used field)
 - #137032 (Decode metadata buffer in one go)
 - #137035 (Normalize closure instance before eagerly monomorphizing it)
 - #137037 (add x86-sse2 (32bit) ABI that requires SSE2 target feature)
 - #137038 (llvm: Tolerate captures in tests)

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

2 files changed, 6 insertions, 6 deletions

diff --git a/library/core/src/mem/maybe_uninit.rs b/library/core/src/mem/maybe_uninit.rs
index 0d8c3ef906b..2c7f1d86341 100644
--- a/library/core/src/mem/maybe_uninit.rs
+++ b/library/core/src/mem/maybe_uninit.rs
@@ -345,7 +345,7 @@ impl<T> MaybeUninit<T> {
     ///
     /// use std::mem::MaybeUninit;
     ///
-    /// extern "C" {
+    /// unsafe extern "C" {
     ///     fn read_into_buffer(ptr: *mut u8, max_len: usize) -> usize;
     /// }
     ///
diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs
index 5b258a7c844..05c16791ce7 100644
--- a/library/core/src/str/mod.rs
+++ b/library/core/src/str/mod.rs
@@ -361,7 +361,7 @@ impl str {
     /// ```
     #[must_use]
     #[stable(feature = "is_char_boundary", since = "1.9.0")]
-    #[rustc_const_unstable(feature = "const_is_char_boundary", issue = "131516")]
+    #[rustc_const_stable(feature = "const_is_char_boundary", since = "CURRENT_RUSTC_VERSION")]
     #[inline]
     pub const fn is_char_boundary(&self, index: usize) -> bool {
         // 0 is always ok.
@@ -818,7 +818,7 @@ impl str {
     #[inline]
     #[must_use]
     #[stable(feature = "str_split_at", since = "1.4.0")]
-    #[rustc_const_unstable(feature = "const_str_split_at", issue = "131518")]
+    #[rustc_const_stable(feature = "const_str_split_at", since = "CURRENT_RUSTC_VERSION")]
     pub const fn split_at(&self, mid: usize) -> (&str, &str) {
         match self.split_at_checked(mid) {
             None => slice_error_fail(self, 0, mid),
@@ -859,7 +859,7 @@ impl str {
     #[inline]
     #[must_use]
     #[stable(feature = "str_split_at", since = "1.4.0")]
-    #[rustc_const_unstable(feature = "const_str_split_at", issue = "131518")]
+    #[rustc_const_stable(feature = "const_str_split_at", since = "CURRENT_RUSTC_VERSION")]
     pub const fn split_at_mut(&mut self, mid: usize) -> (&mut str, &mut str) {
         // is_char_boundary checks that the index is in [0, .len()]
         if self.is_char_boundary(mid) {
@@ -899,7 +899,7 @@ impl str {
     #[inline]
     #[must_use]
     #[stable(feature = "split_at_checked", since = "1.80.0")]
-    #[rustc_const_unstable(feature = "const_str_split_at", issue = "131518")]
+    #[rustc_const_stable(feature = "const_str_split_at", since = "CURRENT_RUSTC_VERSION")]
     pub const fn split_at_checked(&self, mid: usize) -> Option<(&str, &str)> {
         // is_char_boundary checks that the index is in [0, .len()]
         if self.is_char_boundary(mid) {
@@ -940,7 +940,7 @@ impl str {
     #[inline]
     #[must_use]
     #[stable(feature = "split_at_checked", since = "1.80.0")]
-    #[rustc_const_unstable(feature = "const_str_split_at", issue = "131518")]
+    #[rustc_const_stable(feature = "const_str_split_at", since = "CURRENT_RUSTC_VERSION")]
     pub const fn split_at_mut_checked(&mut self, mid: usize) -> Option<(&mut str, &mut str)> {
         // is_char_boundary checks that the index is in [0, .len()]
         if self.is_char_boundary(mid) {