Auto merge of #139595 - matthiaskrgr:rollup-kaa8aim, r=matthiaskrgr

Rollup of 10 pull requests

Successful merges:

 - #138470 (Test interaction between RFC 2229 migration and use closures)
 - #138628 (Add more ergonomic clone tests)
 - #139164 (std: improve documentation for get_mut() methods regarding forgotten guards)
 - #139488 (Add missing regression GUI test)
 - #139489 (compiletest: Add directive `dont-require-annotations`)
 - #139513 (Report higher-ranked trait error when higher-ranked projection goal fails in new solver)
 - #139521 (triagebot: roll compiler reviewers for rustc/unstable book)
 - #139532 (Update `u8`-to-and-from-`i8` suggestions.)
 - #139551 (report call site of inlined scopes for large assignment lints)
 - #139575 (Remove redundant words)

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

2 files changed, 8 insertions, 2 deletions

diff --git a/library/std/src/sync/poison/mutex.rs b/library/std/src/sync/poison/mutex.rs
index 9362c764173..adb74bb6f3d 100644
--- a/library/std/src/sync/poison/mutex.rs
+++ b/library/std/src/sync/poison/mutex.rs
@@ -582,7 +582,9 @@ impl<T: ?Sized> Mutex<T> {
     /// Returns a mutable reference to the underlying data.
     ///
     /// Since this call borrows the `Mutex` mutably, no actual locking needs to
-    /// take place -- the mutable borrow statically guarantees no locks exist.
+    /// take place -- the mutable borrow statically guarantees no new locks can be acquired
+    /// while this reference exists. Note that this method does not clear any previous abandoned locks
+    /// (e.g., via [`forget()`] on a [`MutexGuard`]).
     ///
     /// # Errors
     ///
@@ -599,6 +601,8 @@ impl<T: ?Sized> Mutex<T> {
     /// *mutex.get_mut().unwrap() = 10;
     /// assert_eq!(*mutex.lock().unwrap(), 10);
     /// ```
+    ///
+    /// [`forget()`]: mem::forget
     #[stable(feature = "mutex_get_mut", since = "1.6.0")]
     pub fn get_mut(&mut self) -> LockResult<&mut T> {
         let data = self.data.get_mut();
diff --git a/library/std/src/sync/poison/rwlock.rs b/library/std/src/sync/poison/rwlock.rs
index f9d9321f5f2..a2abd4f692e 100644
--- a/library/std/src/sync/poison/rwlock.rs
+++ b/library/std/src/sync/poison/rwlock.rs
@@ -608,7 +608,9 @@ impl<T: ?Sized> RwLock<T> {
     /// Returns a mutable reference to the underlying data.
     ///
     /// Since this call borrows the `RwLock` mutably, no actual locking needs to
-    /// take place -- the mutable borrow statically guarantees no locks exist.
+    /// take place -- the mutable borrow statically guarantees no new locks can be acquired
+    /// while this reference exists. Note that this method does not clear any previously abandoned locks
+    /// (e.g., via [`forget()`] on a [`RwLockReadGuard`] or [`RwLockWriteGuard`]).
     ///
     /// # Errors
     ///