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 loole, another multiple-producer multiple-consumer channel.

Thanks to Mahdi Shojaee 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

358 pull requests were merged in the last week

Rust Compiler Performance Triage

A week completely free of pure regressions! The compiler has definitely come out of this week a decent amount faster and less memory hungry than before with the large gain coming from building the compiler with a single CGU on x64 Linux. This not only allows LLVM to do more optimizations across the entire compiler, but should hopefully also result in less non-deterministic performance regressions in the future. This improvement largely comes only at the expense of a few more minutes spent when bootstrapping the compiler.

Triage done by @rylev. Revision range: 27b4eb..9998f4


(instructions:u) mean range count
Regressions ❌
1.0% [0.3%, 6.1%] 41
Regressions ❌
2.0% [0.9%, 7.8%] 21
Improvements ✅
-1.3% [-5.1%, -0.2%] 134
Improvements ✅
-1.8% [-6.9%, -0.2%] 175
All ❌✅ (primary) -0.8% [-5.1%, 6.1%] 175

0 Regressions, 2 Improvements, 4 Mixed; 0 of them in rollups 74 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.


Tracking Issues & PRs

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 2023-10-04 - 2023-11-01 🦀




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

I've been writing Rust code everyday for years, and I used to say Rust wasn't great for writing prototypes because if forced you to ask yourself many questions that you may want to avoid at that time.

I recently realized this is all wrong: you can write Rust pretty much as fast as you can write code in any other language, with a meaningful difference: with a little discipline it's easy to make the rough edges obvious so you can sort them out later.

/u/moiaussi4213 on /r/rust

There was no suggestion this week, but llogiq is pleased with his choice nonetheless!

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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