Feed: This Week in Rust

This Week in Rust 📃

This Week in Rust 640

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.

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.

Want TWIR in your inbox? Subscribe here.

Updates from Rust Community

Official

Foundation

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Research

Miscellaneous

Crate of the Week

This week's crate is docstr, a macro crate providing a macro to create multiline strings out of doc comments.

Thanks to Nik Revenco 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.

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

450 pull requests were merged in the last week

Compiler

Library

Cargo

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

Overall, a bit more noise than usual this week, but mostly a slight improvement with several low-level optimizations at MIR and LLVM IR building landing. Also less commits landing than usual, mostly due to GitHub CI issues during the week.

Triage done by @simulacrum. Revision range: 3c9faa0d..eeb94be7

3 Regressions, 4 Improvements, 4 Mixed; 3 of them in rollups 24 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)
Cargo

No Items entered Final Comment Period this week for Rust RFCs, Language Reference, Language Team, Leadership Council 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 2026-02-25 - 2026-03-25 🦀

Virtual

Asia

Europe

North America

Oceania

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

This is actually just Rust adding support for C++-style duck-typed templates, and the long and mostly-irrelevant information contained in the ICE message is part of the experience.

– robofinch on rust-users

Thanks to Kyllingene for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by:

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

This Week in Rust 639

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.

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.

Want TWIR in your inbox? Subscribe here.

Updates from Rust Community

Official

Newsletters

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Miscellaneous

Crate of the Week

This week's crate is banish, a proc macro to build rule-driven state machines using a declarative DSL.

Thanks to Logan Flaherty 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.

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

564 pull requests were merged in the last week

Compiler

Library

Cargo

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

Several pull requests introduced (usually very small) regressions across the board this week. On the other hand, #151380 provided a nice performance win in the inference engine. I would also like to bring attention to #152375, which improved the parallel frontend. It is not shown in this report, because we don't yet have many benchmarks for the parallel frontend, but this PR seemingly improved the check (wall-time) performance with multiple frontend threads on several real-world crates by 5-10%!

Triage done by @kobzol. Revision range: 39219ceb..3c9faa0d

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.7% [0.2%, 3.1%] 96
Regressions ❌
(secondary)		 1.1% [0.0%, 5.7%] 62
Improvements ✅
(primary)		 -0.4% [-0.9%, -0.2%] 8
Improvements ✅
(secondary)		 -2.6% [-7.0%, -0.0%] 45
All ❌✅ (primary) 0.6% [-0.9%, 3.1%] 104

2 Regressions, 0 Improvements, 9 Mixed; 4 of them in rollups 36 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)
Leadership Council

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 2026-02-18 - 2026-03-18 🦀

Virtual

Asia

Europe

North America

Oceania

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

Clearly there is such a thing as too much syntactic sugar (as one of my professors put it, "syntactic sugar causes semantic cancer"), but at the same time also clearly some syntactic sugar is worth having.

– Ralf Jung on rust-internals

Thanks to robofinch for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by:

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

This Week in Rust 638

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.

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.

Want TWIR in your inbox? Subscribe here.

Updates from Rust Community

Newsletters

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Crate of the Week

This week's crate is zedbar, a crate to read QR codes and a bunch of other barcode formats from images.

Thanks to Brian Donovan 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.

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.

  • Oxidize Conference | CFP open until 2026-03-23 | Berlin, Germany | 2026-09-14 - 2026-09-16
  • RustConf 2026 | Last chance: CFP closes 2026-02-16 | Montreal, Quebec, Canada | 2026-09-08 - 2026-09-11

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

569 pull requests were merged in the last week

Compiler

Library

Cargo

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

This week we saw quite a few improvements. Largest one comes from adding two targeted with_capacity calls in #151929. Another source of multiple improvements is the ongoing migration away from using external files to store diagnostic messages.

Triage done by @panstromek. Revision range: a60d12cb..39219ceb

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 2.0% [2.0%, 2.0%] 1
Regressions ❌
(secondary)		 0.6% [0.0%, 2.0%] 22
Improvements ✅
(primary)		 -0.8% [-2.8%, -0.2%] 179
Improvements ✅
(secondary)		 -3.1% [-31.1%, -0.0%] 211
All ❌✅ (primary) -0.7% [-2.8%, 2.0%] 180

1 Regression, 6 Improvements, 7 Mixed; 9 of them in rollups 36 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)
Cargo

No Items entered Final Comment Period this week for Rust RFCs, Language Team, Language Reference, Leadership Council, 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 2026-02-11 - 2026-03-11 🦀

Virtual

Asia

Europe

North America

Oceania

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

Unpopular opinion: error handling in Rust is actually fantastic. Once you know the right patterns, which regrettably are NOT always obvious 😂

– Ian Wagner on fosstodon

Despite another week with a lamentable lack of suggestions, llogiq is pleased with what he found.

Please submit quotes and vote for next week!

This Week in Rust is edited by:

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

This Week in Rust 637

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.

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.

Want TWIR in your inbox? Subscribe here.

Updates from Rust Community

Official

Foundation

Newsletters

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Research

Crate of the Week

This week's crate is vortex, a linux only io_uring based BitTorrent library and TUI.

Thanks to Nehliin 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.

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.

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. * **Oxidize Conference | CFP open until 2026-03-23 | Berlin, Germany | 2026-09-14 - 2026-09-16

  • RustConf 2026 | CFP closes 2026-02-16 | Montreal, Quebec, Canada | 2026-09-08 - 2026-09-11

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

530 pull requests were merged in the last week

Compiler

Library

Cargo

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

Overall a positive week for instruction counts (~1% improvement on check/debug/opt/doc builds). Cycle counts and memory usage remain broadly unchanged across the week though.

Triage done by @simulacrum. Revision range: ebf13cca..a60d12cb

0 Regression, 6 Improvements, 3 Mixed; 3 of them in rollups 33 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
Compiler Team (MCPs only)

Language Team

Unsafe Code Guidelines

No Items entered Final Comment Period this week for Rust RFCs, Cargo, Language Reference or Leadership Council.

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 2026-02-04 - 2026-03-04 🦀

Virtual

Asia

Europe

North America

Oceania

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

In C++, the muscle memory you develop over time is avoidant. You learn not to do certain things. It's a negative memory, not in a pejorative sense, but in the sense that you have to remember what not to do rather than what to do: a list of patterns to avoid, of traps to dodge. And this list keeps growing, because the language doesn't prevent you from falling into the traps, you just have to remember they exist.

In Rust, muscle memory is constructive. You learn patterns that are inherently correct. You don't have to remember what to avoid because the compiler won't let you do it. Instead of thinking "I must remember not to leave the door open", you learn to build a door that closes by itself.

– Marco Bollero on dev.to

Given an acute lack of suggestions, llogiq is pretty thankful to himself for having found a quote regardless.

Please submit quotes and vote for next week!

This Week in Rust is edited by:

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust