This Week in Rust 673

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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 hotcode, a crate for hot-reloading Rust functions at runtime.

Thanks to alordash 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.

No Calls for participation were submitted this week.

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!

603 pull requests were merged in the last week

No significant improvements or regressions this week. Most of the PRs marked as improvements had a similar perf. result, which was caused by codegen noise in the measurements.

There were some nice wins for memory usage though, thanks to #163915 and especially #163887.

Triage done by @Kobzol. Revision range: cc9a14f7..7211ea59

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.2% [0.1%, 0.6%] 73
Regressions ❌
(secondary)		 0.3% [0.1%, 1.4%] 57
Improvements ✅
(primary)		 -0.3% [-1.0%, -0.1%] 21
Improvements ✅
(secondary)		 -0.3% [-1.7%, -0.1%] 28
All ❌✅ (primary) 0.1% [-1.0%, 0.6%] 94

3 Regressions, 21 Improvements, 2 Mixed; 1 of them in rollups 27 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

Language Reference

Leadership Council

No Items entered Final Comment Period this week for Cargo, Compiler Team, Language Team 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 2026-10-14 - 2026-11-11 🦀

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 think that there are a nonzero number of people who are experts in the field who would genuinely respond to "how does C work?" with "it doesn't, next question"

– Clar Fon at the rust-lang zulip

Thanks to kleines Filmröllchen for the suggestion!

Please submit quotes and vote for next week!

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