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.bsky.social on Bluesky or @ThisWeekinRust on mastodon.social, or send us a pull request. Want to get involved? We love contributions.

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Updates from Rust Community

Foundation

Newsletters

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Miscellaneous

Crate of the Week

This week's crate is cloakrs, a library and CLI tool for detecting and masking personally identifiable information.

Despite having no suggestion to work with, llogiq is content with his choice.

Please submit your suggestions and votes for next week!

Calls for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization.

If you are a feature implementer and would like your RFC to appear in this list, add a 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.

No calls for testing were issued this week by Rust, Cargo, Rustup or Rust language RFCs.

Let us know if you would like your feature to be tracked as a part of this list.

Call for Participation; projects and speakers

CFP - Projects

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.

No Calls for participation were submitted this week.

If you are a Rust project owner and are looking for contributors, please submit tasks here or through a PR to TWiR or by reaching out on Bluesky or Mastodon!

CFP - Events

Are you a new or experienced speaker looking for a place to share something cool? This section highlights events that are being planned and are accepting submissions to join their event as a speaker.

If you are an event organizer hoping to expand the reach of your event, please submit a link to the website through a PR to TWiR or by reaching out on Bluesky or Mastodon!

Updates from the Rust Project

502 pull requests were merged in the last week

Compiler

Library

Cargo

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

This week saw a couple of PRs affecting the new trait solver, which is steadily moving forward, in particular #156139 was a massive perf. win. #156185 optimized visibility computation, resulting in up to a 8% win on the typenum crate.

Triage done by @Kobzol. Revision range: 1d72d7e8..aa31d6d8

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.3% [0.1%, 0.4%] 62
Regressions ❌
(secondary)		 0.5% [0.1%, 1.5%] 77
Improvements ✅
(primary)		 -1.7% [-8.8%, -0.2%] 18
Improvements ✅
(secondary)		 -13.6% [-85.6%, -0.0%] 34
All ❌✅ (primary) -0.2% [-8.8%, 0.4%] 80

2 Regressions, 2 Improvements, 5 Mixed; 4 of them in rollups 31 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:

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

Rust
Rust RFCs
Language Reference
Leadership Council

No Items entered Final Comment Period this week for Cargo, Compiler Team (MCPs only), Language Team or Unsafe Code Guidelines. Let us know if you would like your PRs, Tracking Issues or RFCs to be tracked as a part of this list.

New and Updated RFCs

  • No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2026-05-13 - 2026-06-10 🦀

Virtual

Asia

Europe

North America

Oceania

South America

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.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

Of the last 150 merged PRs to Bun, 108 are memory-safety-adjacent — missed cleanup on an error path, use-after-free, uninitialized reads, out-of-bounds access, reentrancy. 75 of those would not compile in a language with destructors, move semantics, and a borrow checker. One in three PRs we ship is "forgot to free something on an error path."

Of the 108, ~88 are in Zig. The ~14 in C++ are mostly ref-cycles and GC-concurrency races — the residual class that survives any language. So the Zig→Rust delta is real: the Zig bugs are exactly the destructor/ownership-fixable kind, and the C++ side is already near the floor.

Without stronger compile-time guarantees, this stays a cat-and-mouse game. The proposal is to remove the largest bug class structurally rather than fix instances of it indefinitely.

– Jarred Sumner on the bun github

Thanks to Brian Kung for the suggestion!

Please submit quotes and vote for next week!

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