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 aquamarine bringing you inline diagrams for your rustdocs.

Thanks to Willi Kappler 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

299 pull requests were merged in the last week

Rust Compiler Performance Triage

This week continues a trend of relatively large rollups, which often contain perf-sensitive PRs. We need to get better at marking PRs as rollup=never or otherwise not including them, but it is unclear how precisely to go about doing so. The tooling for testing individual PRs merged in rollups should also be improved to work better in the next few days, though.

Other than that, this week saw several regressions, most of which were not easily explained. We are seeking feedback from PR authors and reviewers on whether the results are expected and if anything can be done.

Triage done by @rylevick and @simulacrum. Revision range: e05409a02c6e73a3dea6da98798468db2910ca59..1483e67addd37d9bd20ba3b4613b678ee9ad4d68

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

See the full report for more.

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.


Tracking Issues & PRs

New RFCs

Upcoming Events


North America

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Rust Jobs

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Quote of the Week

Describing Rust as a systems programming language in 2021 is like describing Microsoft as Windows or Google as search. Yes, Rust is equipped for systems programming, but its applicability is much wider.

Tim McNamara on twitter

Thanks to Nixon Enraght-Moony for the suggestion.

Please submit quotes and vote for next week!

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

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