This Week in Rust

This Week in Rust 651

TWiR Contributors — Wed, 13 May 2026 00:00:00 -0400

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

Rust Foundation and Package Registry Leaders Unite to Address Open Source Sustainability Crisis

Newsletters

The Embedded Rustacean Issue #71

Project/Tooling Updates

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.

Scientific Computing in Rust 2026| 2026-06-05 | Virtual | 2026-07-08 - 2026-07-10

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

New rule layout.repr.c.struct.align-empty

Leadership Council

Establish the funding team

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

2026-05-17 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Rust Deep Learning: Third Sunday
2026-05-19 | Virtual (Washington, DC, US) | Rust DC
- Mid-month Rustful
2026-05-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
- Mouse Control with Rust
2026-05-20 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-21 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
- May, 2026 SRUG (Seattle Rust User Group) Meetup
2026-05-21 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-05-21 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
- Tock OS Part #4 - Capsule coding in QEMU!
2026-05-26 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Fourth Tuesday
2026-05-26 | Virtual (London, UK) | Women in Rust
- Lunch & Learn: Seeing Into Your Code - A Practical Guide to Tracing in Rust
2026-05-27 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-06-03 | Virtual (Indianapolis, IN, US) | Indy Rust
- Indy.rs - with Social Distancing
2026-06-04 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-06-04 | Virtual (Nürnberg, DE) | Rust Nuremberg
- Rust Nürnberg online
2026-06-07 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Rust Deep Learning: First Sunday
2026-06-09 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Second Tuesday
2026-06-10 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session

Asia

2026-05-13 | Malaysia, MY | Rust Meetup Malaysia
- Rust Meetup May 2026
2026-05-14 | Seoul, KR | Seoul Rust (Programming Language) Meetup
- Seoul Rust Meetup
2026-05-16 | Bangalore, IN | Rust Bangalore
- May 2026 Rustacean meetup
2026-06-02 | Beijing, CN | Voice AI and Rust Meetup (Rust for AI, lowcoderust.com)
- AI Agents and Open Source LLM (Call for Speakers)

Europe

2026-05-13 | Girona, ES | Rust Girona
- Rust Girona Hack & Learn 05 2026
2026-05-14 | Switzerland, CH | PostTenebrasLab
- Rust Meetup Geneva
2026-05-18 - 2026-05-23 | Utrecht, NL | RustWeek 2026
- RustWeek 2026
2026-05-18 | Milano, MI, IT | Rust Language Milan
- RustWeek 2026
2026-05-19 | Aarhus, DK | Rust Aarhus
- Hack Night
2026-05-19 | Amsterdam, NL | RustNL
- RustWeek 2026 announcement
2026-05-19 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
- Cross-Building & Cross-Testing
2026-05-19 | London, UK | Women in Rust
- RustWeek lunch meetup
2026-05-21 | Amsterdam, NL | RustNL
- RustWeek Hackathon
2026-05-22 | Amsterdam, NL | RustNL
- Bike tour around Utrecht
2026-05-26 | Dortmund, DE | Rust Dortmund
- Rust Dortmund Meetup - Agentic Programming - May
2026-05-26 | Manchester, UK | Rust Manchester
- Rust Manchester May Code Night
2026-05-29 | Berlin, DE | Rust Berlin
- Rust Berlin Talks: The next generation
2026-06-03 | Dublin, IE | Rust Dublin
- Join us live and INPERSON for Rust 261

North America

2026-05-14 | Lehi, UT, US | Utah Rust
- Utah Rust May Meetup
2026-05-14 | Mountain View, CA, US | Hacker Dojo
- RUST MEETUP at HACKER DOJO
2026-05-14 | Portland, OR, US | PDXRust
- From Radio Waves to Pixels - Real-Time Visualizations with Rust and WebAssembly
2026-05-14 | San Diego, CA, US | San Diego Rust
- San Diego Rust May Meetup - Back in person!
2026-05-16 | Boston, MA, US | Boston Rust Meetup
- Lechmere Rust Lunch, May 16
2026-05-19 | San Francisco, CA, US | San Francisco Rust Study Group
- Rust Hacking in Person
2026-05-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
- Mouse Control with Rust
2026-05-20 | San Francisco, CA, US | Bay Area Rust Meetup
- Bay Area Rust Meetup
2026-05-21 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
- May, 2026 SRUG (Seattle Rust User Group) Meetup
2026-05-21 | Nashville, TN, US | Music City Rust Developers
- Community Meetup
2026-05-23 | Boston, MA, US | Boston Rust Meetup
- Allston Rust Lunch, May 23
2026-05-27 | Austin, TX, US | Rust ATX
- Rust Lunch - Fareground
2026-05-28 | Atlanta, GA, US | Rust Atlanta
- Rust-Atl
2026-05-28 | Los Angeles, CA, US | Rust Los Angeles
- Rust LA: Rust in Embedded & Autonomous Systems at Parallel Systems in DTLA
2026-05-30 | Boston, MA, US | Boston Rust Meetup
- Central Cambridge Rust Lunch, May 30
2026-06-04 | Saint Louis, MO, US | STL Rust
- Testing, Coverage, Tracey & Mutations
2026-06-06 | Boston, MA, US | Boston Rust Meetup
- Boston Common Rust Lunch, June 6

Oceania

2026-05-14 | Melbourne, AU | Rust Melbourne
- Rust Melbourne - May 2026
2026-05-26 | Barton, ACT, AU | Canberra Rust User Group
- May Meetup

South America

2026-05-13 | Montevideo, UY | Rust Meetup Uruguay
- Rust Uruguay meetup de Mayo

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!

This Week in Rust is edited by:

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

This Week in Rust 650

TWiR Contributors — Wed, 06 May 2026 00:00:00 -0400

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

Announcing Google Summer of Code 2026 selected projects

Newsletters

Rust Trends Issue 77 - Rust Sharpens the Craft

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Miscellaneous

Awesome SQLx Resources

Crate of the Week

This week's crate is burn, a tensor and deep learning library.

Thanks to Jonas for the 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.

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.

Scientific Computing in Rust 2026| 2026-06-05 | Virtual | 2026-07-08 - 2026-07-10

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

504 pull requests were merged in the last week

Compiler

canonicalize free regions from inputs as placeholders in root univ

Library

don't reload length in String::push

Cargo

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

This week's result is pretty much neutral. It looks negative in icount numbers, but that's spurious, wall time remained largely unchanged. Some big performance improvements landed in the new solver, which is not enabled by default, yet.

Triage done by @panstromek. Revision range: ca9a134e..1d72d7e8

Summary:

(instructions:u)	mean	range	count
Regressions ? (primary)	0.6%	[0.2%, 1.2%]	106
Regressions ? (secondary)	0.7%	[0.2%, 2.4%]	67
Improvements ? (primary)	-0.6%	[-1.7%, -0.2%]	66
Improvements ? (secondary)	-0.6%	[-2.8%, -0.0%]	60
All ?? (primary)	0.1%	[-1.7%, 1.2%]	172

1 Regression, 2 Improvements, 9 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)

Rust RFCs

Propose the concept of a crates.io username for identity

Language Team

Revise decision process: champion vs FCP decisions

No Items entered Final Comment Period this week for Cargo, 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 2026-05-06 - 2026-06-03 🦀

Virtual

2026-05-06 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
- Practical introduction to SIMD
2026-05-06 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-06 | Virtual (Indianapolis, IN, US) | Indy Rust
- Indy.rs - with Social Distancing
2026-05-07 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-05-07 | Virtual (Nürnberg, DE) | Rust Nuremberg
- Rust Nürnberg online
2026-05-09 | Virtual (Girona, ES) | Rust Girona
- Learning Rust the Hard Way: Building a TUI Chess Game
2026-05-12 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Second Tuesday
2026-05-12 | Virtual (London, UK) | Women in Rust
- 👋 Community Catch Up
2026-05-12 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
- Introduction to database access using Rust SQLx
2026-05-17 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Rust Deep Learning: Third Sunday
2026-05-19 | Virtual (Washington, DC, US) | Rust DC
- Mid-month Rustful
2026-05-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
- Mouse Control with Rust
2026-05-20 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-21 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
- May, 2026 SRUG (Seattle Rust User Group) Meetup
2026-05-21 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-05-21 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
- Tock OS Part #4 - Capsule coding in QEMU!
2026-05-26 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Fourth Tuesday
2026-05-26 | Virtual (London, UK) | Women in Rust
- Lunch & Learn: Seeing Into Your Code - A Practical Guide to Tracing in Rust
2026-05-27 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-06-03 | Virtual (Indianapolis, IN, US) | Indy Rust
- Indy.rs - with Social Distancing

Africa

2026-05-12 | Johannesburg, ZA | Johannesburg Rust Meetup
- Rust by Example - Flow of Control

Asia

2026-05-13 | Malaysia, MY | Rust Meetup Malaysia
- Rust Meetup May 2026
2026-05-14 | Seoul, KR | Seoul Rust (Programming Language) Meetup
- Seoul Rust Meetup
2026-05-16 | Bangalore, IN | Rust Bangalore
- May 2026 Rustacean meetup

Europe

2026-05-06 | Köln, DE | Rust Cologne
- Rust in May: Rust for Starters, Part 2
2026-05-06 | Milano, MI, IT | Rust Language Milan
- Rust Milan @ Python Milano: Python or Rust? Yes!
2026-05-06 | Oxford, UK | Oxford ACCU/Rust Meetup.
- Building LLMs from scratch
2026-05-07 | Edinburgh, UK | Rust and Friends
- Rust May Talks: Aetherus + Bevy
2026-05-11 | Augsburg, DE | Rust Meetup Augsburg
- Rust Meetup #19: Tiago Manczak - Game On with Rust & Pico
2026-05-13 | Girona, ES | Rust Girona
- Rust Girona Hack & Learn 05 2026
2026-05-14 | Switzerland, CH | PostTenebrasLab
- Rust Meetup Geneva
2026-05-18 - 2026-05-23 | Utrecht, NL | RustWeek 2026
- RustWeek 2026
2026-05-18 | Milano, MI, IT | Rust Language Milan
- RustWeek 2026
2026-05-19 | Aarhus, DK | Rust Aarhus
- Hack Night
2026-05-19 | Amsterdam, NL | RustNL
- RustWeek 2026 announcement
2026-05-19 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
- Cross-Building & Cross-Testing
2026-05-19 | London, UK | Women in Rust
- RustWeek lunch meetup
2026-05-21 | Amsterdam, NL | RustNL
- RustWeek Hackathon
2026-05-22 | Amsterdam, NL | RustNL
- Bike tour around Utrecht
2026-05-26 | Dortmund, DE | Rust Dortmund
- Rust Dortmund Meetup - Agentic Programming - May
2026-05-26 | Manchester, UK | Rust Manchester
- Rust Manchester May Code Night
2026-05-29 | Berlin, DE | Rust Berlin
- Rust Berlin Talks: The next generation

North America

2026-05-07 | New York, NY, US | Rust NYC
- Rust NYC: Reversing the Great Firewall and Geospatial Rust
2026-05-07 | Saint Louis, MO, US | STL Rust
- Open Project Night
2026-05-09 | Boston, MA, US | Boston Rust Meetup
- Back Bay Rust Lunch, May 9
2026-05-14 | Mountain View, CA, US | Hacker Dojo
- RUST MEETUP at HACKER DOJO
2026-05-14 | Portland, OR, US | PDXRust
- From Radio Waves to Pixels - Real-Time Visualizations with Rust and WebAssembly
2026-05-14 | San Diego, CA, US | San Diego Rust
- San Diego Rust May Meetup - Back in person!
2026-05-16 | Boston, MA, US | Boston Rust Meetup
- Lechmere Rust Lunch, May 16
2026-05-19 | San Francisco, CA, US | San Francisco Rust Study Group
- Rust Hacking in Person
2026-05-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
- Mouse Control with Rust
2026-05-20 | San Francisco, CA, US | Bay Area Rust Meetup
- Bay Area Rust Meetup
2026-05-21 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
- May, 2026 SRUG (Seattle Rust User Group) Meetup
2026-05-21 | Nashville, TN, US | Music City Rust Developers
- Community Meetup
2026-05-23 | Boston, MA, US | Boston Rust Meetup
- Allston Rust Lunch, May 23
2026-05-27 | Austin, TX, US | Rust ATX
- Rust Lunch - Fareground
2026-05-28 | Atlanta, GA, US | Rust Atlanta
- Rust-Atl
2026-05-28 | Los Angeles, CA, US | Rust Los Angeles
- Rust LA: Rust in Embedded & Autonomous Systems at Parallel Systems in DTLA
2026-05-30 | Boston, MA, US | Boston Rust Meetup
- Central Cambridge Rust Lunch, May 30

Oceania

2026-05-14 | Melbourne, AU | Rust Melbourne
- Rust Melbourne - May 2026
2026-05-26 | Barton, ACT, AU | Canberra Rust User Group
- May Meetup

South America

2026-05-13 | Montevideo, UY | Rust Meetup Uruguay
- Rust Uruguay meetup de Mayo

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

From a business standpoint, we should have reasonable confidence that it’ll stick around and be healthy for more than 10 years. We’d also like a robust ecosystem of code and tools that we can rely on, and experts we can hire.

– David Anderson on the tailscale blog

Thanks to Ivan Fraixedes 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 649

TWiR Contributors — Wed, 29 Apr 2026 00:00:00 -0400

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

Research

Performance of Rust language

Miscellaneous

awesome axum

Crate of the Week

This week's crate is dithr, a buffer-first dithering and halftoning 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.

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.

EuroRust 2026| 2026-05-04 (extended) | Barcelona, Spain | 2026-10-14 – 2026-10-17
NDC Techtown | 2026-05-03 | Kongsberg, Norway | 2026-09-21 to 23.
Scientific Computing in Rust 2026| 2026-06-05 | Virtual | 2026-07-08 - 2026-07-10

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

480 pull requests were merged in the last week

Compiler

Library

Cargo

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

Relatively few perf-affecting changes this week. Perf report is more positive than users should see due to the -Zincremental-verify-ich related improvements in #155473.

Triage done by @simulacrum. Revision range: 9ab01ae5..ca9a134e

1 Regression, 5 Improvements, 3 Mixed; 3 of them in rollups 32 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

Cargo

Remove curl dependency from crates-io crate

Compiler Team (MCPs only)

Rust RFCs

Unsafe Code Guidelines

Should validity of a reference depend on the contents of memory in any way?

No Items entered Final Comment Period this week for Language Reference, 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 2026-04-29 - 2026-05-27 🦀

Virtual

2026-04-29 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-01 | Virtual (Nürnberg, DE) | Rust Nuremberg
- Hacker's Hike 0x1
2026-05-02 | Virtual (Kampala, UG) | Rust Circle Meetup
- Rust Circle Meetup
2026-05-03 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Rust Deep Learning: First Sunday
2026-05-05 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
- Rust code reading and open source contribution
2026-05-06 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
- Practical introduction to SIMD
2026-05-06 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-06 | Virtual (Indianapolis, IN, US) | Indy Rust
- Indy.rs - with Social Distancing
2026-05-07 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-05-07 | Virtual (Nürnberg, DE) | Rust Nuremberg
- Rust Nürnberg online
2026-05-12 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Second Tuesday
2026-05-12 | Virtual (London, UK) | Women in Rust
- 👋 Community Catch Up
2026-05-17 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Rust Deep Learning: Third Sunday
2026-05-19 | Virtual (Washington, DC, US) | Rust DC
- Mid-month Rustful
2026-05-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
- Mouse Control with Rust
2026-05-20 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-21 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
- May, 2026 SRUG (Seattle Rust User Group) Meetup
2026-05-21 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-05-21 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
- Tock OS Part #4 - Capsule coding in QEMU!
2026-05-26 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Fourth Tuesday
2026-05-26 | Virtual (London, UK) | Women in Rust
- Lunch & Learn: Seeing Into Your Code - A Practical Guide to Tracing in Rust
2026-05-27 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session

Asia

2026-05-13 | Malaysia, MY | Rust Meetup Malaysia
- Rust Meetup May 2026
2026-05-16 | Bangalore, IN | Rust Bangalore
- May 2026 Rustacean meetup

Europe

2026-04-29 | Copenhagen, DK | Copenhagen Rust Community
- Rust meetup #67
2026-04-29 | Paris, FR | Paris Rustaceans
- Rust Meetup in Paris
2026-04-30 | Berlin, DE | Rust Berlin
- Rust Berlin Talks: The next generation
2026-04-30 | Manchester, GB | Rust Manchester
- Rust Manchester April Talk
2026-05-02 | Augsburg, DE | Rust Munich and Rust Augsburg
- Augsburger Linux-Infotag 2026: Gemeinschaftsstand Rust Augsburg und Rust München
2026-05-04 | Amsterdam, NH, NL | Rust Developers Amsterdam Group
- Rust Meetup @ JetBrains
2026-05-04 | Frankfurt, DE | Rust Rhein-Main
- Writing a stock portfolio simulation in Rust with Leptos
2026-05-05 | Olomouc, CZ | Rust Moravia
- 5. Rust Moravia Meetup (Ukaž testy!)
2026-05-06 | Milano, MI, IT | Rust Language Milan
- Rust Milan @ Python Milano: Python or Rust? Yes!
2026-05-06 | Oxford, UK | Oxford ACCU/Rust Meetup.
- Building LLMs from scratch
2026-05-07 | Edinburgh, UK | Rust and Friends
- Rust May Talks: Aetherus + Bevy
2026-05-13 | Girona, ES | Rust Girona
- Rust Girona Hack & Learn 05 2026
2026-05-14 | Switzerland, CH | PostTenebrasLab
- Rust Meetup Geneva
2026-05-18 - 2026-05-23 | Utrecht, NL | RustWeek 2026
- RustWeek 2026
2026-05-19 | Aarhus, DK | Rust Aarhus
- Hack Night
2026-05-19 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
- Cross-Building & Cross-Testing
2026-05-19 | London, UK | Women in Rust
- RustWeek lunch meetup
2026-05-21 | Amsterdam, NL | RustNL
- RustWeek Hackathon
2026-05-22 | Amsterdam, NL | RustNL
- Bike tour around Utrecht
2026-05-26 | Dortmund, DE | Rust Dortmund
- Rust Dortmund Meetup - Agentic Programming - May
2026-05-26 | Manchester, UK | Rust Manchester
- Rust Manchester May Code Night

North America

2026-04-30 | Atlanta, GA, US | Rust Atlanta
- Rust-Atl
2026-04-30 | Mountain View, CA, US | Hacker Dojo
- RUST MEETUP at HACKER DOJO
2026-05-02 | Boston, MA, US | Boston Rust Meetup
- Alewife Rust Lunch, May 2
2026-05-07 | Saint Louis, MO, US | STL Rust
- Open Project Night
2026-05-09 | Boston, MA, US | Boston Rust Meetup
- Back Bay Rust Lunch, May 9
2026-05-14 | Portland, OR, US | PDXRust
- From Radio Waves to Pixels - Real-Time Visualizations with Rust and WebAssembly
2026-05-14 | San Diego, CA, US | San Diego Rust
- San Diego Rust May Meetup - Back in person!
2026-05-16 | Boston, MA, US | Boston Rust Meetup
- Lechmere Rust Lunch, May 16
2026-05-19 | San Francisco, CA, US | San Francisco Rust Study Group
- Rust Hacking in Person
2026-05-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
- Mouse Control with Rust
2026-05-20 | San Francisco, CA, US | Bay Area Rust Meetup
- Bay Area Rust Meetup
2026-05-21 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
- May, 2026 SRUG (Seattle Rust User Group) Meetup
2026-05-21 | Nashville, TN, US | Music City Rust Developers
- Community Meetup
2026-05-23 | Boston, MA, US | Boston Rust Meetup
- Allston Rust Lunch, May 23
2026-05-27 | Austin, TX, US | Rust ATX
- Rust Lunch - Fareground

Oceania

2026-05-14 | Melbourne, AU | Rust Melbourne
- Rust Melbourne - May 2026
2026-05-26 | Barton, ACT, AU | Canberra Rust User Group
- May Meetup

South America

2026-05-13 | Montevideo, UY | Rust Meetup Uruguay
- Rust Uruguay meetup de Mayo

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

Sometimes, the best projects are the ones you never thought you could build.

– Chris Dell on his blog

Another week bereft of any quote suggestions. llogiq is glad to have found this anyway.

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 648

TWiR Contributors — Wed, 22 Apr 2026 00:00:00 -0400

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

RustConf 2026 schedule and registration are live! Early bird ticket prices are available through April 29.

Project/Tooling Updates

Observations/Thoughts

Rust Walkthroughs

Crate of the Week

This week's crate is farben, a German-named macro crate for terminal colors.

Thanks to Nik Revenco for the 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.

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.

EuroRust | 2026-04-27 | Barcelona, Spain | 2026-10-14 - 2026-10-17
NDC Techtown | 2026-05-03 | Kongsberg, Norway | 2026-09-21 to 23.

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

542 pull requests were merged in the last week

Compiler

Library

Rustdoc

Clippy

Rust-Analyzer

Rust Compiler Performance Triage

This week was a bit all over the place, but the largest regressions were either already fixed or they are being investigated. There were also a couple of nice perf. wins.

Triage done by @Kobzol. Revision range: dab8d9d1..9ab01ae5

Summary:

(instructions:u)	mean	range	count
Regressions ❌ (primary)	0.7%	[0.2%, 4.6%]	39
Regressions ❌ (secondary)	0.6%	[0.2%, 1.4%]	31
Improvements ✅ (primary)	-0.6%	[-4.8%, -0.1%]	70
Improvements ✅ (secondary)	-0.7%	[-4.1%, -0.0%]	93
All ❌✅ (primary)	-0.1%	[-4.8%, 4.6%]	109

3 Regressions, 4 Improvements, 6 Mixed; 4 of them in rollups 41 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.

2026-04-22 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-04-23 | Virtual (Amsterdam, NL) | Bevy Game Development
- Bevy Meetup #13
2026-04-23 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-04-24 | Virtual (Nairobi, KE) | RustaceansKenya
- Transitioning To Rust: The Learning Curve
2026-04-28 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Fourth Tuesday
2026-04-28 | Virtual (London, UK) | Women in Rust
- Lunch & Learn: From Protobuf to Production - A Guide to gRPC in Rust
2026-04-28 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
- Web development using axum in Rust - part 4
2026-04-29 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-01 | Virtual (Nürnberg, DE) | Rust Nuremberg
- Hacker's Hike 0x1
2026-05-02 | Virtual (Kampala, UG) | Rust Circle Meetup
- Rust Circle Meetup
2026-05-03 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Rust Deep Learning: First Sunday
2026-05-06 | Virtual (Cardiff, GB) | Rust and C++ Cardiff
- Practical introduction to SIMD
2026-05-06 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-06 | Virtual (Indianapolis, IN, US) | Indy Rust
- Indy.rs - with Social Distancing
2026-05-07 | Virtual (Berlin, DE) | Rust Berlin
- Rust Hack and Learn
2026-05-07 | Virtual (Nürnberg, DE) | Rust Nuremberg
- Rust Nürnberg online
2026-05-12 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Second Tuesday
2026-05-12 | Virtual (London, UK) | Women in Rust
- 👋 Community Catch Up
2026-05-13 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-17 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
- Rust Deep Learning: Third Sunday
2026-05-19 | Virtual (Washington, DC, US) | Rust DC
- Mid-month Rustful
2026-05-20 | Virtual (Girona, ES) | Rust Girona
- Weekly coding session
2026-05-20 | Virtual (Vancouver, BC, CA) | Vancouver Rust
- Mouse Control with Rust

Asia

2026-05-13 | Malaysia, MY | Rust Meetup Malaysia
- Rust Meetup May 2026

Europe

2026-04-23 | Aarhus, DK | Rust Aarhus
- Talk Night and Birthday Party at MFT Energy
2026-04-23 | Paris, FR | Rust Paris
- Rust meetup #85
2026-04-24 - 2026-04-26 | Augsburg, DE | Rust Meetup Augsburg
- Future Week Augsburg: Road to Game Jam – Spielend Bevy und Rust lernen bei Tuxedo Computers
2026-04-25 | Stockholm, SE | Stockholm Rust
- Ferris' Fika Forum #26
2026-04-29 | Copenhagen, DK | Copenhagen Rust Community
- Rust meetup #67
2026-04-29 | Paris, FR | Paris Rustaceans
- Rust Meetup in Paris
2026-04-30 | Berlin, DE | Rust Berlin
- Rust Berlin Talks: The next generation
2026-04-30 | Manchester, GB | Rust Manchester
- Rust Manchester April Talk
2026-05-02 | Augsburg, DE | Rust Munich and Rust Augsburg
- Augsburger Linux-Infotag 2026: Gemeinschaftsstand Rust Augsburg und Rust München
2026-05-04 | Amsterdam, NH, NL | Rust Developers Amsterdam Group
- Rust Meetup @ JetBrains
2026-05-04 | Frankfurt, DE | Rust Rhein-Main
- Writing a stock portfolio simulation in Rust with Leptos
2026-05-05 | Olomouc, CZ | Rust Moravia
- 5. Rust Moravia Meetup (Ukaž testy!)
2026-05-07 | Edinburgh, GB | Rust and Friends
- Rust May Talks: Aetherus + TBA
2026-05-13 | Girona, ES | Rust Girona
- Rust Girona Hack & Learn 05 2026
2026-05-14 | Switzerland, CH | PostTenebrasLab
- Rust Meetup Geneva
2026-05-18 | Milano, MI, IT | Rust Language Milan
- RustWeek 2026
2026-05-19 | Aarhus, DK | Rust Aarhus
- Hack Night
2026-05-19 | Amsterdam, NL | RustNL
- RustWeek 2026 announcement
2026-05-19 | Leipzig, SN, DE | Rust - Modern Systems Programming in Leipzig
- Cross-Building & Cross-Testing
2026-05-19 | London, UK | Women in Rust
- RustWeek lunch meetup

North America

2026-04-20 - 2026-04-22 | Portland, OR | Tokio
- TokioConf 2026
2026-04-22 | Austin, TX, US | Rust ATX
- Rust Lunch - Fareground
2026-04-22 | New York, NY, US | Rust NYC
- Rust NYC: Formally Verified Rust & SAT Solvers
2026-04-22 | Portland, OR | Apache DataFusion Meetup
- Portland Apache DataFusion Meetup
2026-04-23 | Los Angeles, CA, US | Rust Los Angeles
- Rust LA April!
2026-04-25 | Boston, MA, US | Boston Rust Meetup
- South Station Rust Lunch, Apr 25
2026-04-28 | New York, NY, US | Rust NYC
- Rust NYC x OpenAI: Safer 'unsafe' & Barnum: The agentic workflow engine.
2026-04-30 | Atlanta, GA, US | Rust Atlanta
- Rust-Atl
2026-05-07 | Saint Louis, MO, US | STL Rust
- Open Project Night
2026-05-14 | Portland, OR, US | PDXRust
- From Radio Waves to Pixels - Real-Time Visualizations with Rust and WebAssembly
2026-05-14 | San Diego, CA, US | San Diego Rust
- San Diego Rust May Meetup - Back in person!
2026-05-19 | San Francisco, CA, US | San Francisco Rust Study Group
- Rust Hacking in Person
2026-05-20 | San Francisco, CA, US | Bay Area Rust Meetup
- Bay Area Rust Meetup

Oceania

2026-05-14 | Melbourne, AU | Rust Melbourne
- Rust Melbourne - May 2026

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 Rust we pay the price of composition up-front

– Nadieril on rust zulip

Thanks to Nadieril for the self-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