Hello and welcome to another issue of This Week in Rust! Rust is a systems language pursuing the trifecta: safety, concurrency, and speed. 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 css-inline, a crate to inline CSS into style tags.

Thanks to Dmitry Dygalo for the suggestion.

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 Rust Core

297 pull requests were merged in the last week

Rust Compiler Performance Triage

A fairly mixed week with improvements and regressions mostly balancing themselves out. The highlight of this week is we have now started to adopt a new performance triage process which will label PRs that introduce performance regressions with the perf-regression label. Authors and/or reviewers are expected to justify their performance regression either by a short summary of why the change is worth it despite the regression or by creating an issue to follow-up on the regression.

We hope this process will lead to better compiler performance in the long term.

Triage done by @rylev. Revision range: 5a78340..9a27044

2 Regressions, 3 Improvements, 2 Mixed 1 of them in rollups

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 RFCs

No new RFCs were proposed this week.

Upcoming Events


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Rust Jobs


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Quote of the Week

One thing I like about Rust is that it filters out lazy/sloppy thinkers. Even when I disagree with another Rust programmer, there is a certain level of respect that comes from knowing that they thought about the problem deeply enough to pass the borrow checker.

Zeroexcuses on rust-users

Thanks to Jonah for the self-suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, and cdmistman.

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