This Week in Rust 666

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Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tag us at @thisweekinrust.bsky.social on Bluesky or @ThisWeekinRust on mastodon.social, or send us a pull request. Want to get involved? We love contributions.

This Week in Rust is openly developed on GitHub and archives can be viewed at this-week-in-rust.org. If you find any errors in this week's issue, please submit a PR.

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This week's crate is swift-topomap, a microarchitectural observability tool.

Thanks to Ankur Rathore for the self-suggestion!

Please submit your suggestions and votes for next week!

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization.

If you are a feature implementer and would like your RFC to appear in this list, add a call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

Rust

Cargo

No calls for testing were issued this week by Rustup or Rust language RFCs.

Let us know if you would like your feature to be tracked as a part of this list.

Always wanted to contribute to open-source projects but did not know where to start? Every week we highlight some tasks from the Rust community for you to pick and get started!

Some of these tasks may also have mentors available, visit the task page for more information.

If you are a Rust project owner and are looking for contributors, please submit tasks here or through a PR to TWiR or by reaching out on Bluesky or Mastodon!

Are you a new or experienced speaker looking for a place to share something cool? This section highlights events that are being planned and are accepting submissions to join their event as a speaker.

If you are an event organizer hoping to expand the reach of your event, please submit a link to the website through a PR to TWiR or by reaching out on Bluesky or Mastodon!

593 pull requests were merged in the last week

A busy week, with a continued stream of improvements to the next trait solver and next borrow check implementations. Other than those changes, the week was pretty quiet for performance.

Triage done by @simulacrum. Revision range: 8fa1c96c..9a4ad59a

2 Regressions, 4 Improvements, 2 Mixed; 2 of them in rollups. 28 artifact comparisons made in total.

Full report here

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

  • No RFCs were approved this week.

Every week, the team announces the 'final comment period' for RFCs and key PRs which are reaching a decision. Express your opinions now.

Rust

Rust RFCs

Cargo

Compiler Team (MCPs only)

Leadership Council

No Items entered Final Comment Period this week for Language Team, Language Reference or Unsafe Code Guidelines. Let us know if you would like your PRs, Tracking Issues or RFCs to be tracked as a part of this list.

New and Updated RFCs

Rusty Events between 2026-08-26 - 2026-09-23 🦀

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Please see the latest Who's Hiring thread on r/rust

I care about this community, including its human and social nature. I want others to appreciate those qualities, and I don't want to see them compromised and replaced by excessive machine-generated content.

– Quine Dot on rust-users

Thanks to Jonas Fassbender for the suggestion!

Please submit quotes and vote for next week!

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