Rust 1.23.0 prerelease testing


Rust 1.23 is released on Thursday (Happy New Year!) and builds are available now for testing. Release artifacts are uploaded to dev ( currently and will be promoted to prod ( this Thursday. The URL is

You can test rustup with

RUSTUP_DIST_SERVER= rustup update stable

Please let us know if you run into any issues! Pending any detected regressions these are likely to be the exact artifacts that we’ll release on Thursday.

You can find the release notes on GitHub as well:


can we clarify that improve memory usage on average by 5-10%. is of the compilation of programs, not of the resulting binarys.


Upgraded Android SDK to 27, and NDK to r15c. This drops support for Android 9, the minimum supported version is Android 14.

I guess this drops Android NDK 9 and not Android 9.


Yes, it refers to API level 9/14, meaning 2.3/4.0 (gingerbread/ice-cream-sandwich). Android versioning is hard :man_shrugging: