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? Tweet us at @ThisWeekInRust or send us a pull request. Want to get involved? We love contributions.

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Updates from Rust Community

Project/Tooling Updates


Rust Walkthroughs

Crate of the Week

This week's crate is sass-embedded, a library to communicate with Embedded Dart Sass.

Thanks to Ahab 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 didn't 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

411 pull requests were merged in the last week

Rust Compiler Performance Triage

Overall some really impressive wins this week. Note in particular PR #100209, "Lazily decode SourceFile from metadata" (which improved 75 primary benchmark scenarios and 158 secondary scenarios) and PR #98655 "Don't derive PartialEq::ne", which improved 65 primary scenarios and 27 secondary scenarios). There were a few cases that pnkfelix explicitly decided not to mark as triaged; see report for more details there. Also pnkfelix wonders if there is a recent slight-upward trend on max-rss for the past week, see the summary graph

Triage done by @pnkfelix. Revision range: 14a459bf..4a24f08b


(instructions:u) mean range count
Regressions ❌
0.6% [0.4%, 0.8%] 27
Regressions ❌
0.4% [0.2%, 0.6%] 9
Improvements ✅
-1.7% [-20.1%, -0.3%] 91
Improvements ✅
-3.6% [-18.7%, -0.3%] 160
All ❌✅ (primary) -1.2% [-20.1%, 0.8%] 118

3 Regressions, 4 Improvements, 4 Mixed; 3 of them in rollups 43 artifact comparisons made in total

Full report

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.

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

New and Updated RFCs

Upcoming Events

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

Quote of the Week

A fast executing language that crashes all the time is like a supercar… that crashes all the time.

Tris on youtube

Thanks to scottmcm 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.

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