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? Tag us at @ThisWeekInRust on Twitter or @ThisWeekinRust on mastodon.social, 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.

This week's crate is bkmr, a fast CLI bookmark manager and launcher.

Thanks to sysid 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 did not 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

387 pull requests were merged in the last week

Rust Compiler Performance Triage

Overall a good week for performance with 77 real world crates benchmarks showing an average of nearly 1% performance improvement. Unfortunately, the largest regressions are not yet fully understood and require additional investigation. Of particular interest were some large improvements in doc builds due to storing additional metadata. However, this change might cause some crates to compile slightly slower in incremental check builds, but this is still being investigated.

Triage done by @rylev. Revision range: e4dd9edb..9bb6e60

Summary:

(instructions:u)	mean	range	count
Regressions ❌ (primary)	1.4%	[0.4%, 11.0%]	13
Regressions ❌ (secondary)	0.8%	[0.2%, 1.6%]	4
Improvements ✅ (primary)	-1.4%	[-7.9%, -0.3%]	64
Improvements ✅ (secondary)	-2.1%	[-5.6%, -0.3%]	73
All ❌✅ (primary)	-0.9%	[-7.9%, 11.0%]	77

3 Regressions, 4 Improvements, 9 Mixed; 4 of them in rollups 46 artifact comparisons made in total

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.

RFCs

No RFCs entered Final Comment Period this week.

Tracking Issues & PRs

[disposition: merge] Drop support for FreeBSD 10 and 11 from std
[disposition: merge] Stabilize cmpxchg16b_target_feature

New and Updated RFCs

No New or Updated RFCs were created this week.

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.

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