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.

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


Project/Tooling Updates




Rust Walkthroughs


Crate of the Week

This week's crate is html5gum, a WHATWG HTML spec-compliant HTML5 tokenizer.

Thanks to Markus Unterwaditzer 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

381 pull requests were merged in the last week

Rust Compiler Performance Triage

An awesome week. There was some bits of noise from PR #91032 that landed and then had to be backed out (and may soon land again), and we continue to wrestle with how to classify which things to include in rollup PR's. But overall there were some very real wins to the compiler's performance, and it is definitely reflected in the total bootstrap time graph. Great job!

Triage done by @pnkfelix. Revision range: 7bc7be..c54dfe

4 Regressions, 5 Improvements, 4 Mixed; 3 of them in rollups

29 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.


  • No RFCs entered FCP this week.

Tracking Issues & PRs

New and Updated RFCs

Upcoming Events

Rusty Events between 1/26/2022 - 2/23/2022 🦀


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.

Rust Jobs




Tempus Ex

Tweet us at @ThisWeekInRust to get your job offers listed here!

Quote of the Week

Rust : We have a race condition bug in our standard filesystem library !
C++ : You guys have a concurrency safe standard filesystem library ?
C : You guys have a standard filesystem library ?

redditmodsareshits on /r/cpp

Thanks to UtherII 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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