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 this week.


Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is fancy-regex a regex implementation using regex for speed and backtracking for fancy features.

Thanks to Benjamin Minixhofer 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

323 pull requests were merged in the last week

Rust Compiler Performance Triage

Another week dominated by rollups, most of which had relatively small changes with unclear causes embedded. Overall no major changes in performance this week.

Triage done by @simulacrum. Revision range: 1483e67addd37d9bd20ba3b4613b678ee9ad4d68.. f6cb45ad01a4518f615926f39801996622f46179


2 Regressions, 1 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.


No RFCs are currently in the final comment period.

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

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

Quote of the Week

This time we had two very good quotes, I could not decide, so here are both:

What I have been learning ... was not Rust in particular, but how to write sound software in general, and that in my opinion is the largest asset that the rust community tough me, through the language and tools that you developed.

Under this prism, it was really easy for me to justify the step learning curve that Rust offers: I wanted to learn how to write sound software, writing sound software is really hard , and the Rust compiler is a really good teacher.


This ability to identify unsound code transcends Rust's language, and in my opinion is heavily under-represented in most cost-benefit analysis over learning Rust or not.

Jorge Leitao on rust-users


Having a fast language is not enough (ASM), and having a language with strong type guarantees neither (Haskell), and having a language with ease of use and portability also neither (Python/Java). Combine all of them together, and you get the best of all these worlds.

Rust is not the best option for any coding philosophy, it’s the option that is currently the best at combining all these philosophies.

/u/CalligrapherMinute77 on /r/rust

Thanks to 2e71828 and Rusty Shell for their respective suggestions.

Please submit quotes and vote for next week!

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

Discuss on r/rust