-------------------
- [The target configuration option `abi_blacklist` has been renamed
to `unsupported_abis`.][74150] The old name will still continue to work.
-- [Rustc will now warn if you have a C-like enum that implements `Drop`.][72331]
+- [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
This was previously accepted but will become a hard error in a future release.
- [Rustc will fail to compile if you have a struct with
`#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
- [Rustc now correctly relates the lifetime of an existential associated
type.][71896] This fixes some edge cases where `rustc` would erroneously allow
you to pass a shorter lifetime than expected.
-
+- [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/
[74109]: https://github.com/rust-lang/rust/pull/74109/
[74150]: https://github.com/rust-lang/rust/pull/74150/
[73862]: https://github.com/rust-lang/rust/pull/73862/