Feed: This Week in Rust

This Week in Rust 📃

This Week in Rust 660

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

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Miscellaneous

Crate of the Week

This week's crate is dashu, a pure Rust set of libraries of arbitrary precision numbers.

Thanks to JacobZ 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.

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

550 pull requests were merged in the last week

Compiler

Library

Cargo

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

This week many new optimizations landed, making this a very good week for performance. The only real regression was a fix for a miscompile that will likely be re-landed in the future.

Triage done by @JonathanBrouwer. Revision range: 3659db0d..5503df87

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.3% [0.2%, 0.4%] 3
Regressions ❌
(secondary)		 0.9% [0.1%, 2.5%] 25
Improvements ✅
(primary)		 -1.2% [-9.9%, -0.2%] 195
Improvements ✅
(secondary)		 -3.4% [-92.1%, -0.1%] 174
All ❌✅ (primary) -1.2% [-9.9%, 0.4%] 198

2 Regressions, 10 Improvements, 10 Mixed; 7 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:

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)

No Items entered Final Comment Period this week for Cargo, Language Reference, Language Team, Leadership Council, Rust RFCs 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 2026-07-15 - 2026-08-12 🦀

Virtual

Asia

Europe

North America

South 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

Thank you for your PR, but please edit the description like you are a chainsaw-wielding maniac that just discovered the sentences are young adults who came to the lake at summer camp after sunset.

– workingjubilee on Rust github

Thanks to Theemathas 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 659

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 apis-saltans, a Zigbee implementation including a coordinator API.

Thanks to Richard Neumann 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.

* Protocol - Extend bit-exactness tests to f64 reconstruction targets
* Dofigen - No image tag replacement flag for the generate command

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

598 pull requests were merged in the last week

Compiler

Library

Cargo

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

This week was dominated by wild swings in benchmarks of the new-solver, which is not enabled by default, yet. Apart from that, we got a very few notable changes, only one unexpected speedup from a bugfix in rustdoc.

Triage done by @panstromek. Revision range: 7dc2c162..3659db0d

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.2% [0.2%, 0.2%] 3
Regressions ❌
(secondary)		 162.1% [0.2%, 1116.3%] 20
Improvements ✅
(primary)		 -1.4% [-8.4%, -0.1%] 7
Improvements ✅
(secondary)		 -1.1% [-8.4%, -0.1%] 11
All ❌✅ (primary) -0.9% [-8.4%, 0.2%] 10

1 Regression, 1 Improvement, 4 Mixed; 3 of them in rollups 17 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)
Language Reference

No Items entered Final Comment Period this week for Cargo, Language Team, Leadership Council, Rust RFCs or Unsafe Code Guidelines.

New and Updated RFCs

Upcoming Events

Rusty Events between 2026-07-08 - 2026-08-05 🦀

Virtual

Asia

Africa:

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

if a ptr is dereferenced in a forest and nobody hears it, is it sound?

– Kornel on rust-users

Thanks to Cerber-Ursi 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 658

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

Crate of the Week

This week's crate is deconvolution, a image deconvolution and restoration library.

Thanks to pbkx 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.

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

426 pull requests were merged in the last week

Compiler

Library

Cargo

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

Overall, the week was fairly neutral, with no meaningful shift on most benchmarks on any of our statistics.

Triage done by @simulacrum. Revision range: 8b6558a0..7dc2c162

2 Regressions, 1 Improvement, 7 Mixed; 5 of them in rollups 34 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)
Language Reference
Rust RFCs
Unsafe Code Guidelines

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

Upcoming Events

Rusty Events between 2026-07-01 - 2026-07-29 🦀

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

I do rather hope anyone using -Zllvm-target-features or any stabilized form thereof would know that they are getting a conversation with the dragon directly and they should mind their words carefully if they do not wish to be barbecued by it and served over a nice plate of iron filings.

– workingjubilee on rust zulip

Thanks to Tomáš Šedovič 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 657

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

Foundation

Newsletters

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Crate of the Week

This week's crate is cargo-rdme, a cargo command to create your README from your crate’s documentation.

Thanks to Diogo Sousa 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.

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

515 pull requests were merged in the last week

Compiler

Library

Cargo

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

This week had a lot of big swings, with two significant perf regressions that are accepted because they unlock future features and perf improvements. We also saw large improvements in the next trait solver due to the performance optimization work happening there.

Triage done by @JonathanBrouwer with help from @Kobzol. Revision range: b5d46ecb..8b6558a0

Summary:

(instructions:u) mean range count
Regressions ❌
(primary)		 0.9% [0.2%, 2.7%] 184
Regressions ❌
(secondary)		 1.0% [0.1%, 4.2%] 160
Improvements ✅
(primary)		 -0.3% [-0.3%, -0.2%] 2
Improvements ✅
(secondary)		 -11.8% [-69.9%, -0.2%] 25
All ❌✅ (primary) 0.8% [-0.3%, 2.7%] 186

5 Regressions, 3 Improvements, 2 Mixed; 4 of them in rollups 30 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
Leadership Council

No Items entered Final Comment Period this week for Cargo, Compiler Team (MCPs only), Language Reference, Language Team, Rust RFCs 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 2026-06-24 - 2026-07-22 🦀

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

I think this is the wrong decision, and I wish the lang team had stabilized the Late type instead. Better Late than Never.

– /u/CouteauBleu on /r/rust

Thanks to Theemathas 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