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 envious, a serde-based deserializer from environment variables.

Thanks to musicmatze for the 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

350 pull requests were merged in the last week

Rust Compiler Performance Triage

Much noise in benchmarks this week, which makes it hard to tell what the real improvements were and what they were due to. A query cache change (PR #107667) is part of the story. In addition, much improvement was reaped from the change to not deaggregate MIR (PR #107267). Finally, microoptimizing fold_ty (PR #107627) yielded a small improvement to a broad set of benchmarks.

Triage done by @pnkfelix. Revision range: a64ef7d0..e4dd9edb

Summary:

(instructions:u)	mean	range	count
Regressions ❌ (primary)	2.4%	[0.3%, 18.8%]	18
Regressions ❌ (secondary)	1.8%	[0.2%, 4.1%]	21
Improvements ✅ (primary)	-1.0%	[-3.2%, -0.3%]	88
Improvements ✅ (secondary)	-4.0%	[-13.1%, -0.1%]	47
All ❌✅ (primary)	-0.4%	[-3.2%, 18.8%]	106

3 Regressions, 3 Improvements, 8 Mixed; 3 of them in rollups 41 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] rework min_choice algorithm of member constraints
[disposition: merge] fix: Unexpected trait bound not satisfied in HRTB and Associated Type
[disposition: merge] Stabilize feature cstr_from_bytes_until_nul
[disposition: merge] rustdoc: remove inconsistently-present sidebar tooltips
[disposition: merge] Relax ordering rules for asm! operands

New and Updated RFCs

[new] recommended-bin-crates field in Cargo.toml
[new] Ref-wrapping

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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