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Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com>
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@ -143,7 +143,8 @@ Compatibility Notes
- [Turn `proc_macro_back_compat` lint into a hard error.](https://github.com/rust-lang/rust/pull/125596/) - [Turn `proc_macro_back_compat` lint into a hard error.](https://github.com/rust-lang/rust/pull/125596/)
- [Detect unused structs even when implementing private traits](https://github.com/rust-lang/rust/pull/122382/) - [Detect unused structs even when implementing private traits](https://github.com/rust-lang/rust/pull/122382/)
- [`std::sync::ReentrantLockGuard<T>` is no longer `Sync` if `T: !Sync`](https://github.com/rust-lang/rust/pull/125527) which means [`std::io::StdoutLock` and `std::io::StderrLock` are no longer Sync](https://github.com/rust-lang/rust/issues/127340) - [`std::sync::ReentrantLockGuard<T>` is no longer `Sync` if `T: !Sync`](https://github.com/rust-lang/rust/pull/125527) which means [`std::io::StdoutLock` and `std::io::StderrLock` are no longer Sync](https://github.com/rust-lang/rust/issues/127340)
- [alloc: implement FromIterator for Box<str>](https://github.com/rust-lang/rust/pull/99969/) - [Type inference will fail in some cases due to a new impl of FromIterator for Box<str>](https://github.com/rust-lang/rust/pull/99969/)
Notably this breaks versions of the `time` crate before 0.3.55, due to no longer inferring the right impl.
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