Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. 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.

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Updates from Rust Community




Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is bstr, a fast and featureful byte-string library.

Thanks to 8573 for the suggestion!

Please 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 the Rust Project

324 pull requests were merged in the last week

Rust Compiler Performance Triage

From the viewpoint of metrics gathering, this was an absolutely terrible week, because the vast majority of this week's report is dominated by noise. Several benchmarks (html5ever, cranelift-codegen, and keccak) have all been exhibiting bimodal behavior where their compile-times would regress and improve randomly from run to run. Looking past that, we had one small win from adding an inline directive.

Triage done by @pnkfelix. Revision range: e7cdd4c0..17cbdfd0


(instructions:u) mean range count
Regressions ❌
1.1% [0.2%, 6.2%] 26
Regressions ❌
1.9% [0.1%, 5.6%] 34
Improvements ✅
-1.8% [-29.4%, -0.2%] 42
Improvements ✅
-1.3% [-5.3%, -0.2%] 50
All ❌✅ (primary) -0.7% [-29.4%, 6.2%] 68

11 Regressions, 11 Improvements, 13 Mixed; 11 of them in rollups 71 artifact comparisons made in total

Full report here

Call for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization. The following RFCs would benefit from user testing before moving forward:

  • No RFCs issued a call for testing this week.

If you are a feature implementer and would like your RFC to appear on the above list, add the new call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

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 and Updated RFCs

  • No New or Updated RFCs were created this week.

Upcoming Events

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Please see the latest Who's Hiring thread on r/rust

Quote of the Week

In Rust We Trust

Alexander Sidorov on Medium

Thanks to Anton Fetisov for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, andrewpollack, U007D, kolharsam, joelmarcey, mariannegoldin.

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