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

Newsletters

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Research

Crate of the Week

This week's crate is tower-resilience, a library offering resilience features for tower.

Thanks to Josh Rotenberg for the self-suggestion!

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.

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

RFCs

Rust

Rustup

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.

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.

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.

No Calls for papers or presentations were submitted this week.

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

463 pull requests were merged in the last week

Compiler

Library

Cargo

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

Mostly negative week, coming almost entirely from adding sizedness bounds in #142712. Other than that, we got a nice win for async code from state transform optimization in #147493 and quite a few smaller improvements from codegen optimization in #147890.

Triage done by @panstromek. Revision range: 4068bafe..23fced0f

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.7% [0.2%, 3.7%] 113
Regressions ❌
(secondary)		 0.5% [0.1%, 1.7%] 75
Improvements ✅
(primary)		 -0.4% [-0.7%, -0.2%] 3
Improvements ✅
(secondary)		 -2.3% [-20.8%, -0.1%] 30
All ❌✅ (primary) 0.7% [-0.7%, 3.7%] 116

2 Regressions, 2 Improvements, 7 Mixed; 2 of them in rollups 42 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.

Tracking Issues & PRs

Rust

Compiler Team (MCPs only) * Use v0 mangling by default on nightly * Use annotate-snippets as the default emitter on nightly * Creating a new maintainable debuginfo test suite * Switch to v0 mangling for symbols exceeding 64KB characters on targets generated PDB debug info * Promote riscv64a23-unknown-linux-gnu to Tier 2 without host tools * Omit suggestions when spans overlap * Replace rustc_target::specTarget::arch string with enum * Run main rust-analyzer tests in rust-lang/rust CI * Turn emscripten-wasm-eh unwinding ABI on by default * target tier 3 support for hexagon-unknown-qurt * Proposal for a dedicated test suite for the parallel frontend * Give integer literals a sign instead of relying on negation expressions * Also enable ICE file dumps on stable * New Tier-3 target proposal: loongarch64-linux-android

Leadership Council * Proposal: Require all project team members to have Zulip IDs

No Items entered Final Comment Period this week for Rust RFCs, Cargo, Language Team, Language Reference 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

Upcoming Events

Rusty Events between 2025-10-29 - 2025-11-26 🦀

Virtual

Africa

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

Petition to add an unwise keyword in Rust

– James Logan on hachyderm.io

Thanks to llogiq for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, U007D, joelmarcey, mariannegoldin, bennyvasquez, bdillo

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