This Week in Rust 668

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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 tokio-rcu, a user-space RCU implementation specifically built around the semantics of async rust and tokio.

Thanks to Roee Shoshani 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.

Cargo

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

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

RFCs

Rust

Rustup

If you are a feature implementer and would like your RFC to appear on the above list, add the new 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.

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.

  • No Calls for papers or presentations were submitted this week.

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!

613 pull requests were merged in the last week

This week we've hit quite a few regressions, both expected and unexpected. One of them has already been fixed, with fixes for a few others being discussed. One big improvement comes from caching the sanitizer set in Session, which fixes a large regression from last week. A few minor improvements landed, including a 75% reduction in memory usage while compiling bevy_render with the next trait solver.

Triage done by @JonathanBrouwer. Revision range: 5321a4f4..656a9da1

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.5% [0.1%, 1.3%] 121
Regressions ❌
(secondary)		 0.6% [0.1%, 10.3%] 106
Improvements ✅
(primary)		 -0.6% [-1.9%, -0.1%] 63
Improvements ✅
(secondary)		 -0.6% [-2.4%, -0.1%] 65
All ❌✅ (primary) 0.1% [-1.9%, 1.3%] 184

3 Regressions, 2 Improvements, 8 Mixed; 6 of them in rollups 33 artifact comparisons made in total

Full report here

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.

Cargo

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

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

Approved RFCs

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

Cargo

Language Reference

Unsafe Code Guidelines

No Items entered Final Comment Period this week for Rust RFCs, Compiler Team, Language Team or Leadership Council. 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

  • No New or Updated RFCs were created this week.

Rusty Events between 2026-09-09 - 2026-10-07 🦀

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

The Demon has access to a Super Turing Machine.

– Connor Horman on rust zulip

Thanks to Theemathas for the suggestion!

Please submit quotes and vote for next week!

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