Hello and welcome to another issue of This Week in Rust! Rust is a systems language pursuing the trifecta: safety, concurrency, and speed. 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

Papers and Research Projects

No Papers or Research Projects this week


Crate of the Week

This week's crate is egg, a project using e-graphs to provide a new way to build program optimizers and synthesizers.

Thanks to Daniel Nugent for the suggestion!

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 Rust Core

389 pull requests were merged in the last week

Rust Compiler Performance Triage

An overall busy but decent week for performance. While there were some performance regressions they were mostly small, and they were outnumbered by performance gains. Perhaps the most interesting news is not a compiler performance improvement but rather the introduction of no-alias optimizations at the LLVM level. This slightly hurts optimized build time performance in some cases, but it should make some workloads run faster after compilation.

Triage done by @rylev. Revision range: f24ce9b0..9b6339e4

2 Regressions, 5 Improvements, 3 Mixed

1 of them in rollups

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 RFCs

No new RFCs were proposed this week.

Upcoming Events


Asia Pacific

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Rust Jobs




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Quote of the Week

This is just to say,
I have rebased
the feature branch
opened against

and which
you might have been
already working
on fixing

Forgive me,
the diff was so trivial
so minor
so smol

Jubilee on rust-lang zulip

Thanks to Josh Triplett for the suggestion.

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, and cdmistman.

Discuss on r/rust