Rust 1.57.0 prerelease testing

The 1.57.0 pre-release is ready for testing. The release is scheduled for this Thursday, December 2nd. Release notes can be found here.

You can try it out locally by running:

RUSTUP_DIST_SERVER= rustup update stable

The index is You can leave feedback on this thread.

I also wanted to followup on a suggestion for change in recommended testing strategy; pre-release testing strategy · Issue #16 · rust-lang/release-team · GitHub is now tracking that discussion, so please engage there if you have opinions. Thanks!