This Week in Rust 671

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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 ying-profiler, a native Rust sampling memory profiler.

Thanks to Evan Chan 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.

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!

546 pull requests were merged in the last week

This week was fairly positive. We had no pure regressions, and most of the results came from a few architectural improvements with mixed or mostly positive impact. Some improvements also come from addressing previously triaged regression caused by missing no_alias annotation for references in closures.

The biggest improvement this week is in rustdoc, from tackling quadratic behaviour when generating sidebar links. This was reported by a user, but the effect didn't show up in our benchmarks, so we added a special stress test for it.

Triage done by @panstromek. Revision range: 3670d253..c1070d69

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.6% [0.2%, 0.8%] 8
Regressions ❌
(secondary)		 1.4% [0.1%, 5.8%] 30
Improvements ✅
(primary)		 -0.6% [-1.7%, -0.2%] 192
Improvements ✅
(secondary)		 -1.5% [-82.5%, -0.1%] 101
All ❌✅ (primary) -0.6% [-1.7%, 0.8%] 200

0 Regressions, 2 Improvements, 6 Mixed; 3 of them in rollups 26 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)

No Items entered Final Comment Period this week for Language Team, Language Reference, 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

Rusty Events between 2026-09-30 - 2026-10-28 🦀

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 community is obnoxiously helpful. I asked a simple question on the Rust community Discord server. What is the best way to read a file in Rust? I expected a straightforward response. Instead, I got back a 2,000-word essay on the inner workings of IO, buffering, error handling, and ownership, plus links to four different blog posts and three different approaches depending on file size, and a working code example. ... The Rust community has weaponized education against me. I'm now a better engineer than I was yesterday against my will.

– tris on youtube

Thanks to MusicalNinjaDad for the suggestion!

Please submit quotes and vote for next week!

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