Auto merge of #89608 - Manishearth:rollup-m7kd76f, r=Manishearth

Rollup of 12 pull requests

Successful merges:

 - #87601 (Add functions to add unsigned and signed integers)
 - #88523 (Expand documentation for `FpCategory`.)
 - #89050 (refactor: VecDeques Drain fields to private)
 - #89245 (refactor: make VecDeque's IterMut fields module-private, not just crate-private)
 - #89324 (Rename `std::thread::available_conccurrency` to `std::thread::available_parallelism`)
 - #89329 (print-type-sizes: skip field printing for primitives)
 - #89501 (Note specific regions involved in 'borrowed data escapes' error)
 - #89506 (librustdoc: Use correct heading levels.)
 - #89528 (Fix suggestion to borrow when casting from pointer to reference)
 - #89531 (library std, libc dependency update)
 - #89588 (Add a test for generic_const_exprs)
 - #89591 (fix: alloc-optimisation is only for rust llvm)

Failed merges:

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

1 files changed, 7 insertions, 5 deletions

diff --git a/library/std/src/thread/mod.rs b/library/std/src/thread/mod.rs
index 9d659102b03..707a55b6258 100644
--- a/library/std/src/thread/mod.rs
+++ b/library/std/src/thread/mod.rs
@@ -1453,12 +1453,14 @@ fn _assert_sync_and_send() {
 ///
 /// ```
 /// # #![allow(dead_code)]
-/// #![feature(available_concurrency)]
+/// #![feature(available_parallelism)]
 /// use std::thread;
 ///
-/// let count = thread::available_concurrency().map(|n| n.get()).unwrap_or(1);
+/// let count = thread::available_parallelism().map(|n| n.get()).unwrap_or(1);
 /// ```
-#[unstable(feature = "available_concurrency", issue = "74479")]
-pub fn available_concurrency() -> io::Result<NonZeroUsize> {
-    imp::available_concurrency()
+#[doc(alias = "hardware_concurrency")] // Alias for C++ `std::thread::hardware_concurrency`.
+#[doc(alias = "available_concurrency")] // Alias for a name we gave this API on unstable.
+#[unstable(feature = "available_parallelism", issue = "74479")]
+pub fn available_parallelism() -> io::Result<NonZeroUsize> {
+    imp::available_parallelism()
 }