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. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community


Rust Nation 2023


Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is man-in-the-middle-proxy, a - surprise! - man in the middle proxy.

Thanks to Emanuele Em 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

376 pull requests were merged in the last week

Rust Compiler Performance Triage

A really quiet week with almost all regressions being due to noise in benchmarks that show "bimodality" in codegen that can cause swings in performance from one change to the other. The only true performance change was a two-line change by @nnethercote to remove a redundant function call which led to a 0.3% improvement in performance across roughly 15 benchmarks.

Triage done by @rylev. Revision range: 31f858d9..8f9e09ac


(instructions:u) mean range count
Regressions ❌
- - 0
Regressions ❌
2.0% [1.2%, 2.8%] 8
Improvements ✅
-0.4% [-0.7%, -0.2%] 7
Improvements ✅
-1.0% [-1.8%, -0.1%] 31
All ❌✅ (primary) -0.4% [-0.7%, -0.2%] 7

7 Regressions, 8 Improvements, 2 Mixed; 7 of them in rollups 35 artifact comparisons made in total

Full report

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.


Tracking Issues & PRs

New and Updated RFCs

  • No New or Updated RFCs were created this week.

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 2023-03-08 - 2023-04-05 🦀



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

(…) as much as i dislike the cargo-geiger concept, the name … kind of works

unsafe is a lot like uranium. it’s just one more metal ore you can process, refine, and machine. it doesn’t combust in atmosphere, it doesn’t corrode or make weird acids. unless you go out of your way to make it dangerous you don’t even have to worry about critical masses. you can work with it pretty normally most of the time

but if you don’t know exactly what it is, what it does, and how to work with it, it will cause mysterious illnesses that only crop up long after you’ve stopped touching it

Alexander Payne on /r/rust

Thanks to Stephan Sokolow 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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