Rust 1.66.0 pre-release testing

The 1.66.0 pre-release is ready for testing. The release is scheduled for December 15. Release notes can be found here.

You can try it out locally by running:

RUSTUP_DIST_SERVER= rustup update stable

The index is

The release team is also thinking about changes to our pre-release process: we'd love your feedback on this GitHub issue.


Small changes this time around. It's quite a contrast with the last release!

There are some things not quite correct:

The link works if you change /stable/ to /beta/, so that will go live after the actual release.


It seems as though rust-lld with lto="fat" is not working. I discovered the issue with riscv32imac-unknown-xous-elf, and was able to replicate it with x86_64-fortanix-unknown-sgx: rust-lld: lto="fat" no longer works

We aren't in the pre-release period any more, but this is arguably a “release documentation” problem more than a bug, so I thought I'd mention it here: the changelog for Clippy says that uninlined_format_args is new and enabled by default, but it isn't enabled by default.

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