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Title: This Week in Rust 608
Number: 608
Date: 2025-07-16
Category: This Week in Rust

Hello and welcome to another issue of *This Week in Rust*!
[Rust](https://www.rust-lang.org/) 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](https://bsky.app/profile/thisweekinrust.bsky.social) on Bluesky or
[@ThisWeekinRust](https://mastodon.social/@thisweekinrust) on mastodon.social, or
[send us a pull request](https://github.com/rust-lang/this-week-in-rust).
Want to get involved? [We love contributions](https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md).

*This Week in Rust* is openly developed [on GitHub](https://github.com/rust-lang/this-week-in-rust) and archives can be viewed at [this-week-in-rust.org](https://this-week-in-rust.org/).
If you find any errors in this week's issue, [please submit a PR](https://github.com/rust-lang/this-week-in-rust/pulls).

Want TWIR in your inbox? [Subscribe here](https://this-week-in-rust.us11.list-manage.com/subscribe?u=fd84c1c757e02889a9b08d289&id=0ed8b72485).

## Updates from Rust Community

<!--

Dear community contributors:
Please read README.md for guidance on submissions.
Each submitted link should be of the form:

* [Title of the Linked Page](https://example.com/my_article)

If you don't know which category to use, feel free to submit a PR anyway
and just ask the editors to select the category.

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### Official

### Foundation

### Newsletters

### Project/Tooling Updates
* [egui 0.32 - Atoms, popups, and better SVG support](https://github.com/emilk/egui/releases/tag/0.32.0)
* [Introducing Rudy: A Toolchain for Rust Debuginfo](https://www.samjs.io/blog/rudy)

[UltraGraph 0.8: 1,300x Faster Graph Analytics — No Cluster Needed](https://deepcausality.com/blog/announcement-ultragraph-0-8)

### Observations/Thoughts

* [Here comes the sun: iteratively building a Rust program that gets the current weather conditions](https://bitfieldconsulting.com/posts/here-comes-sun)

### Rust Walkthroughs

### Research

### Miscellaneous
* [June 2025 Rust Jobs Report](https://filtra.io/rust/jobs-report/jun-25)

## Crate of the Week

<!-- COTW goes here -->

[Please submit your suggestions and votes for next week][submit_crate]!

[submit_crate]: https://users.rust-lang.org/t/crate-of-the-week/2704

## 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](https://github.com/rust-lang/rust/labels/call-for-testing),
[Rust language RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing),
[Cargo](https://github.com/rust-lang/cargo/labels/call-for-testing) or
[Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing).*

[Let us know](https://github.com/rust-lang/this-week-in-rust/issues) 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.

<!-- CFPs go here, use this format: * [project name - title of issue](URL to issue) -->
* [Diesel: Designing `#[derive(QueryModel)]` Poll I - Default for #[diesel(check_for_backend()]](https://github.com/diesel-rs/diesel/discussions/4680)
* [Diesel: Designing `#[derive(QueryModel)]` Poll II - Joining behaviour for #[diesel(embed)]](https://github.com/diesel-rs/diesel/discussions/4681)
* [Diesel: Designing `#[derive(QueryModel)]` Poll III - All in one derive? ](https://github.com/diesel-rs/diesel/discussions/4682)
<!-- * [ - ]() -->
<!-- or if none - *No Calls for participation were submitted this week.* -->

If you are a Rust project owner and are looking for contributors, please submit tasks [here][guidelines] or through a [PR to TWiR](https://github.com/rust-lang/this-week-in-rust) or by reaching out on [X (formerly Twitter)](https://x.com/ThisWeekInRust) or [Mastodon](https://mastodon.social/@thisweekinrust)!

[guidelines]:https://github.com/rust-lang/this-week-in-rust?tab=readme-ov-file#call-for-participation-guidelines

### 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.

<!-- CFPs go here, use this format: * [**event name**](URL to CFP)| Date CFP closes in YYYY-MM-DD | city,state,country | Date of event in YYYY-MM-DD -->
<!-- or if none - *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](https://github.com/rust-lang/this-week-in-rust) or by reaching out on [X (formerly Twitter)](https://x.com/ThisWeekInRust) or [Mastodon](https://mastodon.social/@thisweekinrust)!

## Updates from the Rust Project

<!-- Rust updates go here -->

### Rust Compiler Performance Triage

A busy week with a lot of rollups containing perf. regressions and mixed results. Overall, regressions won slightly, but there were also a few impressive wins on a few primary and secondary benchmarks. A lot of perf. effects are caused by the current rework of attribute parsing, which will hopefully result in slightly improved performance once it's finished.

Triage done by **@kobzol**.
Revision range: [0d11be5a..a9fb6103](https://perf.rust-lang.org/?start=0d11be5aabe0cd49609fff5fce57c4691a22fe55&end=a9fb6103b05c6ad6eee6bed4c0bb5a2e8e1024c6&absolute=false&stat=instructions%3Au)

**Summary**:

| (instructions:u) | mean | range | count |
|:----------------------------------:|:-----:|:---------------:|:-----:|
| Regressions ❌ <br /> (primary) | 0.5% | [0.1%, 1.5%] | 62 |
| Regressions ❌ <br /> (secondary) | 0.5% | [0.1%, 1.8%] | 78 |
| Improvements ✅ <br /> (primary) | -0.4% | [-3.9%, -0.1%] | 40 |
| Improvements ✅ <br /> (secondary) | -1.4% | [-11.6%, -0.0%] | 74 |
| All ❌✅ (primary) | 0.1% | [-3.9%, 1.5%] | 102 |

5 Regressions, 4 Improvements, 8 Mixed; 5 of them in rollups
47 artifact comparisons made in total

[Full report here](https://github.com/rust-lang/rustc-perf/blob/87d471ce81dd139cca60ee46377a4cf5c131f7cc/triage/2025/2025-07-15.md).

### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)

Changes to Rust follow the Rust [RFC (request for comments) process](https://github.com/rust-lang/rfcs#rust-rfcs). These
are the RFCs that were approved for implementation this week:

* *No RFCs were approved this week.*

### Final Comment Period

Every week, [the team](https://www.rust-lang.org/team.html) announces the 'final comment period' for RFCs and key PRs
which are reaching a decision. Express your opinions now.

#### Tracking Issues & PRs
##### [Rust](https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
* [[rustdoc] Display unsafe attrs with edition 2024 unsafe() wrappers.](https://github.com/rust-lang/rust/pull/143662)
* [disposition: close] [take into account the num of processes by ulimit](https://github.com/rust-lang/rust/pull/143614)
* [Port the proc macro attributes to the new attribute parsing infrastructure](https://github.com/rust-lang/rust/pull/143607)
* [stop specializing on `Copy`](https://github.com/rust-lang/rust/pull/135634)
* [Remove `[T]::array_chunks(_mut)`](https://github.com/rust-lang/rust/pull/143289)
* [Port `#[macro_export] to the new attribute parsing infrastructure](https://github.com/rust-lang/rust/pull/143857)

##### [Rust RFCs](https://github.com/rust-lang/rfcs/labels/final-comment-period),
* [RFC: enable derive(From) for single-field structs](https://github.com/rust-lang/rfcs/pull/3809)

##### [Cargo](https://github.com/rust-lang/cargo/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
* [Redefine `CARGO_TARGET_DIR` to be only an artifacts directory](https://github.com/rust-lang/cargo/issues/14125)

*No Items entered Final Comment Period this week for
[Language Team](https://github.com/rust-lang/lang-team/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc+),
[Language Reference](https://github.com/rust-lang/reference/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc) or
[Unsafe Code Guidelines](https://github.com/rust-lang/unsafe-code-guidelines/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc).*

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](https://github.com/rust-lang/rfcs/pulls)
* [new] [RFC: ID_Compat_Math characters allowed in identifiers](https://github.com/rust-lang/rfcs/pull/3840)

## Upcoming Events

Rusty Events between 2025-07-16 - 2025-08-13 🦀

### Virtual
* 2025-07-13 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
* [**Rust Readers Discord Discussion: Async Rust**](https://www.meetup.com/dallasrust/events/308298512)
* 2025-07-15 | Virtual (London, UK) | [Women in Rust](https://www.meetup.com/women-in-rust)
* [**👋 Community Catch Up**](https://www.meetup.com/women-in-rust/events/307560349)
* 2025-07-15 | Virtual (Washington, DC, US) | [Rust DC](https://www.meetup.com/rustdc)
* [**Mid-month Rustful**](https://www.meetup.com/rustdc/events/306757755)
* 2025-07-16 | Hybrid (Vancouver, BC, CA) | [Vancouver Rust](https://www.meetup.com/vancouver-rust)
* [**Rust Study/Hack/Hang-out**](https://www.meetup.com/vancouver-rust/events/307731031)
* 2025-07-17 | Hybrid (Redmond, WA, US) | [Seattle Rust User Group](https://www.meetup.com/join-srug)
* [**July, 2025 Computer Programming Language Panel (Special Event)**](https://www.meetup.com/seattle-rust-user-group/events/307698855)
* 2025-07-17 | Virtual (Berlin, DE) | [Rust Berlin](https://www.meetup.com/rust-berlin)
* [**Rust Hack and Learn**](https://www.meetup.com/rust-berlin/events/300820305)
* 2025-07-20 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
* [**Rust Readers Discord Discussion: Rust Atomics and Locks**](https://www.meetup.com/dallasrust/events/308383001)
* 2025-07-22 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
* [**Fourth Tuesday**](https://www.meetup.com/dallasrust/events/tgctrtyhckbdc)
* 2025-07-22 | Virtual (London, UK) | [Women in Rust](https://www.meetup.com/women-in-rust)
* [**Lunch & Learn: Crates, Tips & Tricks Lightning Talks - Bring your ideas!**](https://www.meetup.com/women-in-rust/events/307560304)
* 2025-07-24 | Virtual (Nürnberg, DE) | [Rust Nuremberg](https://www.meetup.com/rust-noris)
* [**Rust Nürnberg online**](https://www.meetup.com/rust-noris/events/304567874)
* 2025-07-27 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
* [**Rust Readers Discord Discussion: Rust Atomics and Locks**](https://www.meetup.com/dallasrust/events/bhctrtyhckbkc)
* 2025-07-31 | Virtual (Berlin, DE) | [Rust Berlin](https://www.meetup.com/rust-berlin)
* [**Rust Hack and Learn**](https://www.meetup.com/rust-berlin/events/300820306)
* 2025-08-02 | Virtual (Kampala, UG) | [Rust Circle Meetup](https://www.eventbrite.com/o/rust-circle-kampala-65249289033)
* [**Rust Circle Meetup**](https://www.eventbrite.com/e/rust-circle-meetup-tickets-628763838567)
* 2025-08-03 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
* [**Rust Readers Discord Discussion: Rust Atomics and Locks**](https://www.meetup.com/dallasrust/events/bhctrtyhclbfb)
* 2025-08-06 | Virtual (Indianapolis, IN, US) | [Indy Rust](https://www.meetup.com/indyrs)
* [**Indy.rs - with Social Distancing**](https://www.meetup.com/indyrs/events/wqzhftyhclbjb)

### Asia
* 2025-07-26 | Bangalore, IN | [Rust Bangalore](https://hasgeek.com/rustbangalore)
* [**July 2025 Rustacean meetup**](https://hasgeek.com/rustbangalore/july-2025-rustacean-meetup/)

### Europe
* 2025-07-09 | Girona, ES | [Rust Girona](https://lu.ma/rust-girona)
* [**Rust Girona Hack & Learn 07 2025**](https://lu.ma/hismn492)
* 2025-07-09 | Reading, UK | [Reading Rust Workshop](https://www.meetup.com/reading-rust-workshop)
* [**Reading Rust Meetup**](https://www.meetup.com/reading-rust-workshop/events/308705791)
* 2025-07-10 | Berlin, DE | [Rust Berlin](https://www.meetup.com/rust-berlin)
* [**Rust Berlin on location 🏳️‍🌈 - Edition 004**](https://www.meetup.com/rust-berlin/events/308987361)
* 2025-07-15 | Leipzig, DE | [Rust - Modern Systems Programming in Leipzig](https://www.meetup.com/rust-modern-systems-programming-in-leipzig)
* [**Topic TBD**](https://www.meetup.com/rust-modern-systems-programming-in-leipzig/events/308592246)
* 2025-07-15 | London, UK | [London Rust Project Group](https://www.meetup.com/london-rust-project-group)
* [**TUI Power: Simulating & Visualising Sensor Data with Rust**](https://www.meetup.com/london-rust-project-group/events/308434768)
* 2025-07-23 | Dortmund, DE | [Rust Dortmund](https://www.meetup.com/rust-dortmund/)
* [**Rust Dortmund Meetup - Teach and Hack**](https://www.meetup.com/rust-dortmund/events/308517530/)
* 2025-07-24 | Edinburgh, UK | [Rust and Friends](https://www.meetup.com/rust-edi)
* [**July talks: A Crab, a Pufferfish and a State-of-the-art Chess AI**](https://www.meetup.com/rust-and-friends/events/308687848)
* 2025-07-24 | Nuremberg/Nürnberg, DE | [Rust Nuremberg](https://www.meetup.com/rust-noris/)
* [**Rust Nürnberg online**](https://www.meetup.com/rust-noris/events/304567874/)
* 2025-07-29 | Manchester, UK | [Rust Manchester](https://www.meetup.com/rust-manchester)
* [**Lightning Talks July 2025**](https://www.meetup.com/rust-manchester/events/308085035)
* 2025-07-29 | Prague, CZ | [Rust Czech Republic](https://www.meetup.com/rust-czech-republic)
* [**Nix Meetup at Braiins :)**](https://www.meetup.com/rust-czech-republic/events/308963318)
* 2025-07-30 | Amsterdam, NL | [Rust Developers Amsterdam Group](https://www.meetup.com/rust-amsterdam-group)
* [**Rust Meetup @ BlockTech**](https://www.meetup.com/rust-amsterdam-group/events/308548455)
* 2025-07-31 | Augsburg, DE | [Rust Meetup Augsburg](https://rust-augsburg.github.io/meetup)
* [**Rust Meetup #14: Prof. Dr. Claudia Meitinger - Embassy - Möglichkeiten und Herausforderungen im Modul "Interdisciplinary Project"**](https://rust-augsburg.github.io/meetup/Meetup_14.html)

### North America
* 2025-07-09 | Phoenix, AZ, US | [Desert Rust](https://www.meetup.com/desert-rustaceans)
* [**Rust <> AI**](https://www.meetup.com/desert-rustaceans/events/308507249)
* 2025-07-10 | Mountain View, CA, US | [Hacker Dojo](https://www.meetup.com/hackerdojo/)
* [**RUST MEETUP at HACKER DOJO**](https://www.meetup.com/hackerdojo/events/308277549)
* 2025-07-10 | Portland, OR, US | [PDXRust](https://www.meetup.com/pdxrust)
* [**July 2025 PDX Rust Meetup**](https://www.meetup.com/pdxrust/events/309056548)
* 2025-07-15 | San Francisco, CA, US | [San Francisco Rust Study Group](https://www.meetup.com/san-francisco-rust-study-group)
* [**Rust Hacking in Person**](https://www.meetup.com/san-francisco-rust-study-group/events/307931266)
* 2025-07-16 | Hybrid (Vancouver, BC, CA) | [Vancouver Rust](https://www.meetup.com/vancouver-rust)
* [**Rust Study/Hack/Hang-out**](https://www.meetup.com/vancouver-rust/events/307731031)
* 2025-07-17 | Chicago, IL, US | [Chicago Rust Meetup](https://www.meetup.com/chicago-rust-meetup)
* [**Rust Happy Hour**](https://www.meetup.com/chicago-rust-meetup/events/308979091)
* 2025-07-17 | Hybrid (Redmond, WA, US) | [Seattle Rust User Group](https://www.meetup.com/join-srug)
* [**July, 2025 Computer Programming Language Panel (Special Event)**](https://www.meetup.com/seattle-rust-user-group/events/307698855)
* 2025-07-17 | Nashville, TN, US | [Music City Rust Developers](https://www.meetup.com/music-city-rust-developers)
* [**Rust on Bare Metal Series 1 : Introduction to Embedded Development**](https://www.meetup.com/music-city-rust-developers/events/304333113)
* 2025-07-23 | Austin, TX, US | [Rust ATX](https://www.meetup.com/rust-atx)
* [**Rust Lunch - Fareground**](https://www.meetup.com/rust-atx/events/308791385)
* 2025-07-24 | Mountain View, CA, US | [Hacker Dojo](https://www.meetup.com/hackerdojo/)
* [**RUST MEETUP at HACKER DOJO**](https://www.meetup.com/hackerdojo/events/xdxtqtyhckbgc)
* 2025-07-31 | Atlanta, GA, US | [Rust Atlanta](https://www.meetup.com/rust-atl)
* [**Rust-Atl**](https://www.meetup.com/rust-atl/events/308675947)

### South America
* 2025-07-12 | São Paulo, BR | [Rust São Paulo Meetup](https://www.meetup.com/rust-sao-paulo-meetup)
* [**Encontro do Rust-SP na WillBank**](https://www.meetup.com/rust-sao-paulo-meetup/events/307308851)
* 2025-07-17 | Florianópolis, BR | [Rust Brazil + Rust Floripa](https://lu.ma/calendar/cal-iOloL5ZqswCO5Mm)
* [**Rust Floripa**](https://lu.ma/p0umq6vm)

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][community] for access.

[calendar]: https://www.google.com/calendar/embed?src=apd9vmbc22egenmtu5l6c5jbfc%40group.calendar.google.com
[community]: mailto:community-team@rust-lang.org

## Jobs
<!--

Rust Jobs:

TWiR has stopped featuring individual job postings. You can read more about this change here:

https://github.com/rust-lang/this-week-in-rust/issues/3412

-->

Please see the latest [Who's Hiring thread on r/rust](INSERT_LINK_HERE)

# Quote of the Week

<!-- QOTW goes here -->

[Please submit quotes and vote for next week!](https://users.rust-lang.org/t/twir-quote-of-the-week/328)

*This Week in Rust is edited by: [nellshamrell](https://github.com/nellshamrell), [llogiq](https://github.com/llogiq), [cdmistman](https://github.com/cdmistman), [ericseppanen](https://github.com/ericseppanen), [extrawurst](https://github.com/extrawurst), [U007D](https://github.com/U007D), [joelmarcey](https://github.com/joelmarcey), [mariannegoldin](https://github.com/mariannegoldin), [bennyvasquez](https://github.com/bennyvasquez), [bdillo](https://github.com/bdillo)*

*Email list hosting is sponsored by [The Rust Foundation](https://foundation.rust-lang.org/)*

<small>[Discuss on r/rust](REDDIT_LINK_HERE)</small>
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