Move stack size to Libraries

Author: Mark-Simulacrum

RELEASES.md

@@ -46,6 +46,8 @@ Libraries
 - [Fix overly restrictive lifetime in `core::panic::Location::file` return type](https://github.com/rust-lang/rust/pull/132087)
 - [Guarantee parameter order for `_by()` variants of `min` / `max`/ `minmax` in `std::cmp`](https://github.com/rust-lang/rust/pull/139357)
 - [Document assumptions about `Clone` and `Eq` traits](https://github.com/rust-lang/rust/pull/144330/)
+- [`std::thread`: Return error if setting thread stack size fails](https://github.com/rust-lang/rust/pull/144210)
+  This used to panic within the standard library.
 
 <a id="1.91.0-Stabilized-APIs"></a>
 
@@ -155,6 +157,7 @@ Rustdoc
 
 Compatibility Notes
 -------------------
+
 - [Always require coroutine captures to be drop-live](https://github.com/rust-lang/rust/pull/144156)
 - [Apple: Always pass SDK root when linking with `cc`, and pass it via `SDKROOT` env var](https://github.com/rust-lang/rust/pull/131477). This should fix linking issues with `rustc` running inside Xcode. Libraries in `/usr/local/lib` may no longer be linked automatically, if you develop or use a crate that relies on this, you should explicitly set `cargo::rustc-link-search=/usr/local/lib` in a `build.rs` script.
 - [Relaxed bounds in associated type bound position like in `TraitRef<AssocTy: ?Sized>` are now correctly forbidden](https://github.com/rust-lang/rust/pull/135331)
@@ -204,7 +207,6 @@ significant improvements to the performance or internals of rustc and related
 tools.
 
 - [Update to LLVM 21](https://github.com/rust-lang/rust/pull/143684)
-- [std: thread: Return error if setting thread stack size fails](https://github.com/rust-lang/rust/pull/144210)
 
 
 Version 1.90.0 (2025-09-18)