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.

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


Project/Tooling Updates


Rust Walkthroughs

Crate of the Week

This week's crate is error-stack, a currently nightly-only error handling library that optimizes for ease of use while allowing to add arbitrary context data to errors.

Thanks to Alfred Mountfield for the self-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

374 pull requests were merged in the last week

Rust Compiler Performance Triage

A pretty busy week for performance, with quite a few PRs landing with significant improvements to specific benchmarks. Overall the week was positive, with many benchmarks improving at least a little. No significant changes in memory usage this week.

Triage done by @simulacrum. Revision range: edab34a..abace0a

5 Regressions, 6 Improvements, 3 Mixed; 1 of them in rollups 54 artifact comparisons made in total

See full report for details.

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.

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Quote of the Week

Rwlock vs Mutex? Please, tell me like I'm 5

Mutex: "Mom says it's my turn on the synchronization primitive."
Write lock: "Hey! You all are not allowed to look until I'm done writing!" Read lock: "Hey! You are not allowed to edit what you wrote until we're done reading it!"

Thanks for an actual 5 year old reply, made me laugh

/u/LyonSyonII and /u/everything-narrative on /r/rust

Thanks to Josh Triplett 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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