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

No official blog posts, newsletters, or research papers this week.

Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is typed-index-collections, a crate that lets you make Vecs with custom-typed indices.

Thanks to Tim for the nomination

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.

No issues were proposed for CfP.

Updates from Rust Core

280 pull requests were merged in the last week

Rust Compiler Performance Triage

A somewhat quiet week. Some PRs had performance runs performed on them, but the changes were merged despite this. Also, we still have issues with certain benchmarks being noisy.

Triage done by @rylev. Revision range: 25a277..cdbe2

2 Regressions, 2 Improvements, 1 Mixed 0 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:

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

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


Red Hat





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

Quote of the Week

Ok, you wanted it. Let's go full meta:

This time, there were two crates and one quote, which is not much, but ok. Keep it up, folks!

llogiq on reddit

Thanks to Patrice Peterson for the suggestion!

Please submit quotes and vote for next week!

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

Discuss on r/rust