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 symbols, a utility to quickly create proc-macros to solidify database tables into enums enabling compile time foreign key checks.

Thanks to Marco Napetti for the self-suggestion!

Please submit your suggestions and votes for next week!

Call for Participation

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.

Updates from the Rust Project

369 pull requests were merged in the last week

Rust Compiler Performance Triage

A small number of perf changes that unfortunately led to quite a few perf regressions. A large chunk of those regressions were in rustdoc and were considered acceptable since rustdoc is now doing strictly more work. Some other regressions have already been fixed and will hopefully soon be merged. The last of the regressions are still under investigation, but hopefully they will be resolved soon.

Triage done by @rylev. Revision range: df0295f0..9358642e


(instructions:u) mean range count
Regressions ❌
3.0% [0.2%, 12.3%] 53
Regressions ❌
4.1% [0.2%, 11.6%] 102
Improvements ✅
-0.3% [-0.5%, -0.1%] 65
Improvements ✅
-0.6% [-1.2%, -0.2%] 25
All ❌✅ (primary) 1.1% [-0.5%, 12.3%] 118

4 Regressions, 1 Improvements, 1 Mixed; 1 of them in rollups 60 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.

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.


  • No RFCs entered Final Comment Period this week.

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 2023-12-06 - 2024-01-03 🦀




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

NVIDIA's firmware, Airlie said, comes with a set of include files that, in turn, define structures that change over time. To deal with these changes, the driver is going to need some sort of automated ABI generation; he noted that the developers working on the Apple M1 GPU driver have run into the same problem. This problem could be made easier to tackle, he suggested, if the driver were, like the M1 driver, to be rewritten in Rust.

Jonathan Corbet paraphrasing David Airlie on Linux Weekly News

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.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust