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Updated RELEASES.md for 1.23.0 #46327

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Updated RELEASES.md for 1.23.0 #46327

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Updated RELEASES.md for 1.23.0
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Version 1.23.0 (2018-01-04)
==========================

Language
--------
- [Arbitrary `auto` traits are now permitted in trait objects.][45772]
- [rustc now uses subtyping on the left hand side of binary operations.][45435]
Which should fix some confusing errors in some operations.

Compiler
--------
- [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
undefined behaviour.][45920]
- [rustc now suggests renaming import if names clash.][45660]
- [Display errors/warnings correctly when there are zero-width or
wide characters.][45711]
- [rustc now avoids unnecessary copies of arguments that are
simple bindings][45380] This should improve memory usage on average by 5-10%.
- [Updated musl used to build musl rustc to 1.1.17][45393]

Libraries
---------
- [Allow a trailing comma in `assert_eq/ne` macro][45887]
- [Implement Hash for raw pointers to unsized types][45483]
- [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
- [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
- [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
- [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
and `<*mut T>::as_mut`][44932]
- [Optimized `Thread::{park, unpark}` implementation][45524]
- [Improved `SliceExt::binary_search` performance.][45333]
- [impl `FromIterator<()>` for `()`][45379]
- [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
is now deprecated.

Stabilized APIs
---------------

Cargo
-----
- [Cargo now supports alternative registries][cargo/4506]
- [Cargo now supports uninstallation of multiple packages][cargo/4561]
eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
- [Added unit test checking to `cargo check`][cargo/4592]
- [Cargo now lets you install a specific version
using `cargo install --version`][cargo/4637]

Misc
----
- [Releases now ship with the Cargo book documentation.][45692]
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This might have to get yanked if #46195 isn't resolved

- [rustdoc now prints rendering warnings on every run.][45324]
- [Release tarballs now come with rustfmt][45903]

Compatibility Notes
-------------------
- [Changes have been made to type equality to make it more correct,
in rare cases this could break some code.][45853] [Tracking issue for
further information][45852]
- [`char::escape_debug` now uses Unicode 10 over 9.][45571]
- [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
Android 9, the minimum supported version is Android 14.
- [Bumped the minimum LLVM to 3.9][45326]

[44042]: https://github.com/rust-lang/rust/pull/44042
[44932]: https://github.com/rust-lang/rust/pull/44932
[45267]: https://github.com/rust-lang/rust/pull/45267
[45324]: https://github.com/rust-lang/rust/pull/45324
[45326]: https://github.com/rust-lang/rust/pull/45326
[45333]: https://github.com/rust-lang/rust/pull/45333
[45379]: https://github.com/rust-lang/rust/pull/45379
[45380]: https://github.com/rust-lang/rust/pull/45380
[45393]: https://github.com/rust-lang/rust/pull/45393
[45435]: https://github.com/rust-lang/rust/pull/45435
[45483]: https://github.com/rust-lang/rust/pull/45483
[45524]: https://github.com/rust-lang/rust/pull/45524
[45571]: https://github.com/rust-lang/rust/pull/45571
[45580]: https://github.com/rust-lang/rust/pull/45580
[45610]: https://github.com/rust-lang/rust/pull/45610
[45660]: https://github.com/rust-lang/rust/pull/45660
[45692]: https://github.com/rust-lang/rust/pull/45692
[45711]: https://github.com/rust-lang/rust/pull/45711
[45772]: https://github.com/rust-lang/rust/pull/45772
[45852]: https://github.com/rust-lang/rust/issues/45852
[45853]: https://github.com/rust-lang/rust/pull/45853
[45887]: https://github.com/rust-lang/rust/pull/45887
[45903]: https://github.com/rust-lang/rust/pull/45903
[45920]: https://github.com/rust-lang/rust/pull/45920
[cargo/4506]: https://github.com/rust-lang/cargo/pull/4506
[cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
[cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
[cargo/4637]: https://github.com/rust-lang/cargo/pull/4637


Version 1.22.1 (2017-11-22)
==========================

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