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 newsletters or research papers this week.


Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is arraygen, a derive proc macro to generate arrays from structs.

Thanks to José Manuel Barroso Galindo 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

333 pull requests were merged in the last week

Rust Compiler Performance Triage

A lot of noise in the benchmark results this week. We are discussing (zulip archive, live zulip) how best to update the benchmark set to eliminate the noisy cases that are bouncing around. Beyond that, some large improvements to a few individual benchmarks.

The memory usage (max-rss) seemed largely flat. Except for an upward trend on tuple-stess that indicates 4% more memory from a week ago.

Triage done by @pnkfelix. Revision range: 382f..25a2

5 Regressions, 7 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

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

Protocol Labs

Amazon Web Services

Techno Creatives






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

Quote of the Week

I often think about Rust as a process and community for developing a programming language, rather than as a programming language itself.

throwaway894345 on hacker news

Thanks to Krishna Sundarram 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