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 on Twitter 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.

Updates from Rust Community

Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is Apache Iceberg Rust, a Rust implementation of a table format for huge analytic datasets.

Thanks to Renjie Liu for the self-suggestion!

Please submit your suggestions and votes for next week!

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.

CFP - Speakers

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 were submitted this week.

If you are an event organizer hoping to expand the reach of your event, please submit a link to the submission website through a PR to TWiR.

Updates from the Rust Project

409 pull requests were merged in the last week

Rust Compiler Performance Triage

This was a very quiet week with only one PR having any real impact on overall compiler performance. The removal of the internal StructuralEq trait saw a roughly 0.4% improvement on average across nearly 50 real-world benchmarks.

Triage done by @rylev. Revision range: d6b151fc7..5c9c3c7


(instructions:u) mean range count
Regressions ❌
0.5% [0.3%, 0.7%] 5
Regressions ❌
0.5% [0.2%, 1.4%] 10
Improvements ✅
-0.5% [-1.5%, -0.2%] 48
Improvements ✅
-2.3% [-7.7%, -0.4%] 36
All ❌✅ (primary) -0.4% [-1.5%, 0.7%] 53

0 Regressions, 4 Improvements, 4 Mixed; 3 of them in rollups 37 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

Language Reference

  • No Language Reference RFCs entered Final Comment Period this week.

Unsafe Code Guidelines

  • No Unsafe Code Guideline RFCs entered Final Comment Period this week.

New and Updated RFCs

Call for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization. The following RFCs would benefit from user testing before moving forward:

  • No RFCs issued a call for testing this week.

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.

Upcoming Events

Rusty Events between 2024-01-31 - 2024-02-28 🦀




North 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.


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

Quote of the Week

The sheer stability of this program is what made me use rust for everything going forward. The social-service has a 100% uptime for almost 2.5 years now. It’s processed 12.9TB of traffic and is still using 1.5mb of ram just like the day we ran it 2.5 years ago. The resource usage is so low it brings tears to my eyes. As someone who came from Java, the lack of OOM errors or GC problems has been a huge benefit of rust and I don’t ever see myself using any other programming language. I’m a big fan of the mindset “build it once, but build it the right way” which is why rust is always my choice.

/u/Tiflotin on /r/rust

Thanks to Brian Kung for the suggestion!

Please submit quotes and vote for next week!

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

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