Rust 1.98.0 pre-release testing

The 1.98.0 pre-release is ready for testing. The release is scheduled for August 20. Release notes can be found here.

You can try it out locally by running:

RUSTUP_DIST_SERVER=https://dev-static.rust-lang.org rustup update stable

The index is https://dev-static.rust-lang.org/dist/2026-08-18/index.html.

General feedback about our pre-release process is welcome on this GitHub issue.

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One error in the release notes: they claim to have stabilised Send and Sync for std::process::CommandArgs, but I think actually the opposite occurred (negative impls !Send and !Sync were stabilised on the type). EDIT: this was wrong, the outdated links to stable catch me out sometimes and I may have muddled it with a different commit that isn't part of the stable release and affects a different type.

No, it just links to the docs of stable instead of beta.