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 and archives can be viewed at this-week-in-rust.org. If you find any errors in this week's issue, please submit a PR.

This week's crate is Parsel, an easy to use parser generator.

Thanks to jacg 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

400 pull requests were merged in the last week

Rust Compiler Performance Triage

Relatively quiet week outside of a large win on one incremental benchmark in a regression test (i.e., not real world code). Bimodality in a number of benchmarks continues to be an issue.

Triage done by @simulacrum. Revision range: b9d608c9..b5e51db

5 Regressions, 6 Improvements, 3 Mixed; 5 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:

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: close] Tracking issue for std::default::default()
[disposition: merge] Create unnecessary_send_constraint lint for &(dyn ... + Send)
[disposition: merge] Change default panic handler message format.
[disposition: close] MSVC and rustc disagree on minimum stack alignment on x86 Windows
[disposition: merge] style-guide: Add chapter about formatting for nightly-only syntax
[disposition: merge] rustdoc: Allow whitespace as path separator like double colon
[disposition: merge] Add internal_features lint
[disposition: merge] Don't require associated types with Self: Sized bounds in dyn Trait objects
[disposition: merge] Return Ok on kill if process has already exited

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:

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 2023-06-28 - 2023-07-26 🦀

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.