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.

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Updates from Rust Community

Official

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Crate of the Week

This week's crate is flac-coded, an implementation of (unsurprisingly) the Free Lossless Audio Codec (FLAC) file format.

Thanks to tuffy for the self-suggestion!

Please submit your suggestions and votes for next week!

Calls for Testing

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.

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

Call for Participation; projects and speakers

CFP - Projects

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 X (formerly Twitter) or Mastodon!

CFP - Events

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 X (formerly Twitter) or Mastodon!

Updates from the Rust Project

588 pull requests were merged in the last week

Compiler

Library

Cargo

Miri

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

Busy week. Results are dominated by changes that trade some wins for some losses in small incremental scenarios. We also had a lot of noise and spurious small changes on various PRs. Some regressions come from perf related work where we expect to get some wins back later.

Triage done by @panstromek. Revision range: ad3b7257..0d11be5a

Summary:

Note: We switched to a new benchmark machine at the begining of the period. We show summary based on slightly adjusted range 6988a8fe..8df4a58a to avoid misleading comparisons from different machines.

(instructions:u) mean range count
Regressions ❌
(primary)		 1.1% [0.2%, 4.3%] 128
Regressions ❌
(secondary)		 1.0% [0.2%, 3.9%] 84
Improvements ✅
(primary)		 -3.5% [-7.2%, -0.2%] 48
Improvements ✅
(secondary)		 -5.1% [-42.6%, -0.2%] 68
All ❌✅ (primary) -0.2% [-7.2%, 4.3%] 176

3 Regressions, 3 Improvements, 11 Mixed; 6 of them in rollups 44 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:

Final Comment Period

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

Tracking Issues & PRs

Rust
Language Reference

No Items entered Final Comment Period this week for Rust RFCs, Cargo, 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

  • No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2025-07-09 - 2025-08-06 🦀

Virtual

Asia

Europe

North America

South America

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.

Jobs

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

Quote of the Week

You might be asking: why did you rewrite [...] in Rust? And yeah, I don’t really have a good reason. It’s a hobby project. Like gardening, but with more segfaults.

– Collin Richards on their blog

Thanks to robin for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, U007D, joelmarcey, mariannegoldin, bennyvasquez, bdillo

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