This Week in Rust 672

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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 karatepe, a statically typed localisation language and library.

Thanks to miro 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.

No calls for testing were issued this week by Rust, Cargo, 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.

  • RustWeek 2027 | CFP closes 2027-01-10 | Utrecht, The Netherlands | Event date: 2027-05-24
  • TokioConf 2027 | CFP closes 2026-11-30 | Portland, Oregon, USA | 2027-04-26 - 2027-04-27

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!

653 pull requests were merged in the last week

A relatively quiet week, but a very positive one nonetheless. Highlights are a 3.1% improvement in rustdoc speed from not using the metadata based crate_hash for rustdoc runs, a 0.5% improvement from a new fast path in the trait solver, and a 0.4% improvement from a cache for the parents of SpanData.

Triage done by @JonathanBrouwer. Revision range: c1070d69..cc9a14f7

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.6% [0.4%, 1.0%] 12
Regressions ❌
(secondary)		 0.4% [0.1%, 0.9%] 26
Improvements ✅
(primary)		 -1.1% [-6.2%, -0.2%] 212
Improvements ✅
(secondary)		 -1.9% [-15.7%, -0.1%] 208
All ❌✅ (primary) -1.0% [-6.2%, 1.0%] 224

4 Regressions, 3 Improvements, 1 Mixed; 5 of them in rollups 33 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:

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

Rust

Compiler Team (MCPs only)

Language Reference

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

This RFC will appear in the Call for Testing section of the next issue (#) of This Week in Rust (TWiR). You may remove the call-for-testing label. Please feel free to leave the call-for-testing label in place if you would like this RFC to appear again in another issue of TWiR.

Rusty Events between 2026-10-07 - 2026-11-04 🦀

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

There ain't no rules here in Quote of the Week - it's survival of the wittest

– Simon Buchan on rust-users

Thanks to Jonas Fassbender for the suggestion!

Please submit quotes and vote for next week!

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