+- [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
+ The library will need to be installed for `rustc` to work, even though we
+ expect it to be already available on most systems.
+- [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
+ under QEMU.][74820]
+- [Pretty printing of some tokens in procedural macros changed.][75453] The
+ exact output returned by rustc's pretty printing is an unstable
+ implementation detail: we recommend any macro relying on it to switch to a
+ more robust parsing system.
+
+[75453]: https://github.com/rust-lang/rust/issues/75453/
+[74820]: https://github.com/rust-lang/rust/issues/74820/
+[74420]: https://github.com/rust-lang/rust/issues/74420/