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 or newsletters this week.

Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is RustFFT, a Fast Fourier transformation library that lives up to the name.

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

292 pull requests were merged in the last week

Rust Compiler Performance Triage

  • 2020-12-15: 6 Regressions, 1 Improvements, 2 Mixed

This week was fairly quite with lots of small regressions. Most of the regressions were either for fixes to changes that yielded large performance wins in previous weeks or small performance losses where there is already a plan for how to gain those losses back.

Triage done by @rylev.

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


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

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

Quote of the Week

It took me sometime to let go and embrace getting things working before optimizing. It was a major breakthrough on that journey when I realized that ALL my python variables are Rc<RefCell<_>> , so any chance I had to make a variable that was less complicated than that was already a big optimization. If 1/10 Rust variables had to be that complicated it would not feel good, but it would already be 90% better. So if 1/50 make the code ezere to read and maintain then do it!

Eh2406 on /r/rust

Thanks to Stephan Sokolow 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