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 symphonia, a collection of pure-Rust audio decoders for many common formats.

Thanks to Kornel 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.

diesel - Generate matching SQL types for Mysql enums

If you are a Rust project owner and are looking for contributors, please submit tasks here.

Updates from the Rust Project

377 pull requests were merged in the last week

Rust Compiler Performance Triage

Overall a positive week, with relatively few regressions overall and a number of improvements.

Triage done by @simulacrum. Revision range: c8e6a9e..a64ef7d

Summary:

(instructions:u)	mean	range	count
Regressions ❌ (primary)	0.6%	[0.6%, 0.6%]	1
Regressions ❌ (secondary)	0.3%	[0.3%, 0.3%]	1
Improvements ✅ (primary)	-0.8%	[-2.0%, -0.2%]	27
Improvements ✅ (secondary)	-0.9%	[-1.9%, -0.5%]	11
All ❌✅ (primary)	-0.8%	[-2.0%, 0.6%]	28

2 Regressions, 4 Improvements, 6 Mixed; 2 of them in rollups 44 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:

Create an Operational Semantics Team

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] Stabilize feature cstr_from_bytes_until_nul
[disposition: merge] Support true and false as boolean flag params
[disposition: merge] Implement AsFd and AsRawFd for Rc
[disposition: merge] rustdoc: compute maximum Levenshtein distance based on the query

New and Updated RFCs

[new] Permissions
[new] Add text for the CFG OS Version RFC

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:

Feature: Help test Cargo's new index protocol

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.

Upcoming Events

Rusty Events between 2023-02-01 - 2023-03-01 🦀

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.