Auto merge of #128142 - matthiaskrgr:rollup-rep8ofv, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - #126152 (size_of_val_raw: for length 0 this is safe to call)
 - #127252 (Add edge-case examples to `{count,leading,trailing}_{ones,zeros}` methods)
 - #127374 (Tweak "wrong # of generics" suggestions)
 - #127457 (Make tidy fast without compromising case alternation)
 - #127480 (Fix build failure on vxworks #127084 )
 - #127733 (Replace some `mem::forget`'s with `ManuallyDrop`)
 - #128120 (Gate `AsyncFn*` under `async_closure` feature)
 - #128131 (Import `c_void` rather than using the full path)
 - #128133 (Improve spans on evaluated `cfg_attr`s.)

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

Author: bors

tests/fail-dep/concurrency/libc_pthread_mutex_deadlock.stderr

@@ -10,7 +10,7 @@ LL |             assert_eq!(libc::pthread_mutex_lock(lock_copy.0.get() as *mut _
 error: deadlock: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/pal/PLATFORM/thread.rs:LL:CC
    |
-LL |             let ret = libc::pthread_join(self.id, ptr::null_mut());
+LL |         let ret = unsafe { libc::pthread_join(id, ptr::null_mut()) };
    |                                                                  ^ the evaluated program deadlocked
    |
    = note: BACKTRACE:

tests/fail-dep/concurrency/libc_pthread_rwlock_write_read_deadlock.stderr

@@ -10,7 +10,7 @@ LL |             assert_eq!(libc::pthread_rwlock_wrlock(lock_copy.0.get() as *mu
 error: deadlock: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/pal/PLATFORM/thread.rs:LL:CC
    |
-LL |             let ret = libc::pthread_join(self.id, ptr::null_mut());
+LL |         let ret = unsafe { libc::pthread_join(id, ptr::null_mut()) };
    |                                                                  ^ the evaluated program deadlocked
    |
    = note: BACKTRACE:

tests/fail-dep/concurrency/libc_pthread_rwlock_write_write_deadlock.stderr

@@ -10,7 +10,7 @@ LL |             assert_eq!(libc::pthread_rwlock_wrlock(lock_copy.0.get() as *mu
 error: deadlock: the evaluated program deadlocked
   --> RUSTLIB/std/src/sys/pal/PLATFORM/thread.rs:LL:CC
    |
-LL |             let ret = libc::pthread_join(self.id, ptr::null_mut());
+LL |         let ret = unsafe { libc::pthread_join(id, ptr::null_mut()) };
    |                                                                  ^ the evaluated program deadlocked
    |
    = note: BACKTRACE: