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prepares 603 for publish and creates draft for 604 

Signed-off-by: Nell Shamrell <nellshamrell@gmail.com>
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Title: This Week in Rust 604
Number: 604
Date: 2025-06-18
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
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### Official
### Foundation
### Newsletters
### Project/Tooling Updates
### Observations/Thoughts
### Rust Walkthroughs
### Research
### Miscellaneous
## 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. The following
RFCs would benefit from user testing before moving forward:
<!-- Calls for Testing go here, use this format:
* [<RFC Topic>](<RFC URL>)
* [Tracking Issue](<Tracking Issue URL>)
* [Testing steps](<Testing Steps URL>)
-->
<!-- or if there are no new or updated RFCs this week, use: -->
<!-- * *No New or Updated RFCs were created this week.* -->
<!-- Remember to remove the `call-for-testing` label from the RFC so that the maintainer can signal for testers again, if desired. -->
### [RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing)
### [Rust](https://github.com/rust-lang/rust/labels/call-for-testing)
### [Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing)
If you are a feature implementer and would like your RFC to appear on the above list, add the new `call-for-testing`
label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature
need testing.
## Call for Participation; projects and speakers
### CFP - Projects
Always wanted to contribute to open-source projects but did not know where to start?
Every week we highlight some tasks from the Rust community for you to pick and get started!
Some of these tasks may also have mentors available, visit the task page for more information.
<!-- CFPs go here, use this format: * [project name - title of issue](URL to issue) -->
<!-- * [ - ]() -->
<!-- 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
<!-- Perf results go here -->
### [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:
<!-- Approved RFCs go here, use this format: * [Topic](URL) -->
<!-- or if none were approved this week, use: * *No RFCs were approved this week.* -->
<!-- * []() -->
<!--
### [Approved Major Change Proposals (MCP)](https://forge.rust-lang.org/compiler/mcp.html)
<!~~ MCPs occur infrequently, so this section is commented out by default. ~~>
<!~~ MCPs which have been approved or rejected this week go here, use this format: * [major change accepted|rejected] [Topic](URL) ~~>
-->
### 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.
#### [RFCs](https://github.com/rust-lang/rfcs/labels/final-comment-period)
<!-- RFCs which have entered FCP go here, use this format: * [disposition: merge|close] [Topic](URL) -->
<!-- or if none entered FCP this week, use: * *No RFCs entered Final Comment Period this week.* -->
<!-- * [disposition: ] []() -->
#### Tracking Issues & PRs
<!-- Tracking Issues which have entered FCP go here, use this format: * [disposition: merge|close] [Topic](URL) -->
<!-- or if none entered FCP this week, use: -->
<!-- * *No Tracking Issues or PRs entered Final Comment Period this week.* -->
<!-- * [disposition: ] []() -->
##### [Rust](https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
##### [Cargo](https://github.com/rust-lang/cargo/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
##### [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)
##### [Unsafe Code Guidelines](https://github.com/rust-lang/unsafe-code-guidelines/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc)
#### [New and Updated RFCs](https://github.com/rust-lang/rfcs/pulls)
<!-- New or updated RFCs go here, use this format: * [new|updated] [Topic](URL) -->
<!-- or if there are no new or updated RFCs this week, use: -->
<!-- * *No New or Updated RFCs were created this week.* -->
<!-- * [new|updated] []() -->
## Upcoming Events
Rusty Events between 2025-06-18 - 2025-07-16 🦀
### Virtual
* 2025-06-11 | Virtual (Tel Aviv, IL) | [Code Mavens 🦀 - 🐍 - 🐪](https://www.meetup.com/code-mavens/)
* [**Rust at Work - conversation with Herbert Wolverson of Ardan Labs & LibreQoS**](https://www.meetup.com/code-mavens/events/308234298/)
* 2025-06-12 | Virtual (Charlottesville, VA, US) | [Charlottesville Rust Meetup](https://www.meetup.com/charlottesville-rust-meetup)
* [**Meet, swap, and learn!**](https://www.meetup.com/charlottesville-rust-meetup/events/307767236)
* 2025-06-12 | Virtual (Girona, ES) | [Rust Girona](https://lu.ma/rust-girona)
* [**Sessió setmanal de codificació / Weekly coding session**](https://lu.ma/jibhz3zs)
* 2025-06-15 | 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/308074808)
* 2025-06-17 | Virtual (Washington, DC, US) | [Rust DC](https://www.meetup.com/rustdc)
* [**Mid-month Rustful**](https://www.meetup.com/rustdc/events/305170853)
* 2025-06-18 | Hybrid (Vancouver, BC, CA) | [Vancouver Rust](https://www.meetup.com/vancouver-rust)
* [**Rust Study/Hack/Hang-out**](https://www.meetup.com/vancouver-rust/events/307730493)
* 2025-06-19 | Hybrid (Redmond, WA, US) | [Seattle Rust User Group](https://www.meetup.com/join-srug)
* [**June, 2025 SRUG (Seattle Rust User Group) Meetup**](https://www.meetup.com/seattle-rust-user-group/events/305658476)
* 2025-06-19 | Virtual (Berlin, DE) | [Rust Berlin](https://www.meetup.com/rust-berlin)
* [**Rust Hack and Learn**](https://www.meetup.com/rust-berlin/events/300820303)
* 2025-06-19 | Virtual (Girona, ES) | [Rust Girona](https://lu.ma/rust-girona)
* [**Sessió setmanal de codificació / Weekly coding session**](https://lu.ma/vna66he1)
* 2025-06-22 | 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/308246353)
* 2025-06-24 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
* [**Fourth Tuesday**](https://www.meetup.com/dallasrust/events/305361436)
* 2025-06-24 | Virtual (London, UK) | [Women in Rust](https://www.meetup.com/women-in-rust)
* [**Building Efficient Web Scrapers: Rust vs. Python for Data Ingestion**](https://www.meetup.com/women-in-rust/events/306683025)
* 2025-06-26 | Virtual (Girona, ES) | [Rust Girona](https://lu.ma/rust-girona)
* [**Sessió setmanal de codificació / Weekly coding session**](https://lu.ma/cgamfls6)
* 2025-06-26 | Virtual (Nürnberg, DE) | [Rust Nuremberg](https://www.meetup.com/rust-noris)
* [**Rust Nürnberg online**](https://www.meetup.com/rust-noris/events/304567869)
* 2025-06-29 | 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/kvqfrtyhcjbmc)
* 2025-07-02 | Virtual (Indianapolis, IN, US) | [Indy Rust](https://www.meetup.com/indyrs)
* [**Indy.rs - with Social Distancing**](https://www.meetup.com/indyrs/events/302031667)
* 2025-07-03 | Virtual (Berlin, DE) | [Rust Berlin](https://www.meetup.com/rust-berlin/events/)
* [**Rust Hack and Learn**](https://www.meetup.com/rust-berlin/events/300820304)
* 2025-07-05 | 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-628763176587)
* 2025-07-06 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust/events/)
* [**Rust Readers Discord Discussion: Async Rust**](https://www.meetup.com/dallasrust/events/308298511)
* 2025-07-08 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust/events/)
* [**Second Tuesday**](https://www.meetup.com/dallasrust/events/305361452)
### Africa
* 2025-06-17 | Johannesburg, ZA | [Johannesburg Rust Meetup](https://www.meetup.com/johannesburg-rust-meetup/events/)
* [**Rust Closures**](https://www.meetup.com/johannesburg-rust-meetup/events/308274745)
### Asia
* 2025-06-14 | Kuala Lumpur, MY | [Rust Malaysia x APUGDC x ACM SIGGRAPH KL](https://www.eventbrite.sg/cc/rust-lang-malaysia-meetup-2017119)
* [**Gentle introduction to GameDev with Bevy (Rust Meetup June 2025)**](https://docs.google.com/forms/d/e/1FAIpQLSeDgCDwORn42mgWoMeMlEJJ2LPsOQzqcgdEPW_L3ipuBFbNbQ/viewform)
* 2025-06-28 | Bangalore/Bengaluru, IN | [Rust Bangalore](https://hasgeek.com/rustbangalore)
* [**June 2025 Rustacean meetup**](https://hasgeek.com/rustbangalore/june-2025-rustacean-meetup/)
* 2025-07-02 | Seoul, KR | [Rust Programming Meetup Seoul](https://www.meetup.com/rust-seoul-meetup/events/)
* [**Seoul Rust Meetup**](https://www.meetup.com/rust-seoul-meetup/events/308408246)
### Europe
* 2025-06-11 | Reading, UK | [Reading Rust Workshop](https://www.meetup.com/reading-rust-workshop)
* [**Reading Rust Meetup**](https://www.meetup.com/reading-rust-workshop/events/305045448)
* 2025-06-12 | Berlin, DE | [Rust Berlin](https://www.meetup.com/rust-berlin)
* [**Rust Berlin on location 🏳️‍🌈 - Edition 003**](https://www.meetup.com/rust-berlin/events/308131380)
* 2025-06-17 | Cambridge, GB | [Cambridge Rust Meetup](https://www.meetup.com/cambridge-rust-meetup/events/)
* [**Monthly Rust Meetup**](https://www.meetup.com/cambridge-rust-meetup/events/308294416)
* 2025-06-17 | Leipzig, SN, 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/305741641)
* 2025-06-18 | Stockholm, SE | [Stockholm Rust](https://www.meetup.com/stockholm-rust)
* [**Rust Meetup @Magello**](https://www.meetup.com/stockholm-rust/events/308129156)
* 2025-06-19 | Aarhus, DK | [Rust Aarhus](https://www.meetup.com/rust-aarhus)
* [**Rust Aarhus meetup at Trifork**](https://www.meetup.com/rust-aarhus/events/308060489)
* 2025-06-19 | Edinburgh, UK | [Rust and Friends](https://www.meetup.com/rust-edi)
* [**Rust and Friends (evening pub)**](https://www.meetup.com/rust-and-friends/events/308023524)
* 2025-06-20 | Edinburgh, UK | [Rust and Friends](https://www.meetup.com/rust-edi)
* [**Rust and Friends (daytime coffee)**](https://www.meetup.com/rust-and-friends/events/308023512)
* 2025-06-24 | Manchester, UK | [Rust Manchester](https://www.meetup.com/rust-manchester)
* [**Rust Manchester June Code Night**](https://www.meetup.com/rust-manchester/events/307919158)
* 2025-06-25 | London, UK | [London Rust Project Group](https://www.meetup.com/london-rust-project-group)
* [**Lessons learnt from making a tiny game in nostd Rust**](https://www.meetup.com/london-rust-project-group/events/306809962)
* 2025-06-26 | Barcelona, ES | [BcnRust](https://www.meetup.com/bcnrust/events/)
* [**18th BcnRust Meetup**](https://www.meetup.com/bcnrust/events/308399403)
* 2025-06-26 | Copenhagen, DK | [Copenhagen Rust Community](https://www.meetup.com/copenhagen-rust-community)
* [**Rust meetup #58**](https://www.meetup.com/copenhagen-rust-community/events/308161212)
* 2025-06-26 | Paris, FR | [Rust Paris](https://www.meetup.com/rust-paris/events/)
* [**Rust meetup #77**](https://www.meetup.com/rust-paris/events/308416060)
* 2025-07-01 | Gdansk, PL | [Rust Gdansk](https://www.meetup.com/rust-gdansk/events/)
* [**Rust Gdansk Meetup #9**](https://www.meetup.com/rust-gdansk/events/308349712)
* 2025-07-02 | Basel, CH | [Rust Basel](https://www.meetup.com/rust-basel)
* [**Rust Meetup #12 @ kHaus**](https://www.meetup.com/rust-basel/events/307567391)
* 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, GB | [Reading Rust Workshop](https://www.meetup.com/reading-rust-workshop/events/)
* [**Reading Rust Meetup**](https://www.meetup.com/reading-rust-workshop/events/wrdkmtyhckbmb)
### North America
* 2025-06-11 | Phoenix, AZ, US | [Desert Rust](https://www.meetup.com/desert-rustaceans)
* [**Rust <> Security**](https://www.meetup.com/desert-rustaceans/events/308010023)
* 2025-06-12 | Mountain View, CA, US | [Hacker Dojo](https://www.meetup.com/hackerdojo/events/)
* [**RUST MEETUP at HACKER DOJO**](https://www.meetup.com/hackerdojo/events/308019627)
* 2025-06-17 | 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/307595021)
* 2025-06-17 | San Francisco, CA, US | [Vara Network](https://lu.ma/events-by-vara-gear)
* [**Rust Workshop by Vara Network**](https://lu.ma/acwxdnwq)
* 2025-06-18 | Hybrid (Vancouver, BC, CA) | [Vancouver Rust](https://www.meetup.com/vancouver-rust)
* [**Rust Study/Hack/Hang-out**](https://www.meetup.com/vancouver-rust/events/307730493)
* 2025-06-19 | Hybrid (Redmond, WA, US) | [Seattle Rust User Group](https://www.meetup.com/join-srug)
* [**June, 2025 SRUG (Seattle Rust User Group) Meetup**](https://www.meetup.com/seattle-rust-user-group/events/305658476)
* 2025-06-19 | México City, MX | [Rust MX](https://www.meetup.com/rust-mx)
* [**programación asíncrona en Rust usando Tokio**](https://www.meetup.com/rust-mx/events/308248260)
* 2025-06-19 | Nashville, TN, US | [Music City Rust Developers](https://www.meetup.com/music-city-rust-developers)
* [**Using Rust For Web Series 3 : Final Presentations and Community Social**](https://www.meetup.com/music-city-rust-developers/events/304333108)
* 2025-06-19 | Redmond, WA, US | [Seattle Rust User Group](https://www.meetup.com/join-srug/events/)
* [**June, 2025 SRUG (Seattle Rust User Group) Meetup**](https://www.meetup.com/seattle-rust-user-group/events/305658476)
* 2025-06-20 | Boston, MA, US | [Boston Rust Meetup](https://www.meetup.com/bostonrust)
* [**Lechmere Rust Lunch, June 20**](https://www.meetup.com/bostonrust/events/307936242)
* 2025-06-25 | Austin, TX, US | [Rust ATX](https://www.meetup.com/rust-atx)
* [**Rust Lunch - Fareground**](https://www.meetup.com/rust-atx/events/xvkdgtyhcjbhc)
* 2025-06-26 | Los Angeles, CA, US | [Rust Los Angeles](https://www.meetup.com/rust-los-angeles/events/)
* [**Rust in Web3 Developer Group**](https://www.meetup.com/rust-los-angeles/events/308401269)
* 2025-06-26 | Los Angeles (Chino Hills), CA, US | [Vara Network](https://lu.ma/events-by-vara-gear)
* [**Rust in Web3**](https://lu.ma/ek8jx2r3)
* 2025-06-26 | Spokane, WA, US | [Spokane Rust](https://www.meetup.com/spokane-rust)
* [**Monthly Meetup: Making a CRUD API with Rust!**](https://www.meetup.com/spokane-rust/events/307969600)
* 2025-06-28 | Boston, MA, US | [Boston Rust Meetup](https://www.meetup.com/bostonrust)
* [**Back Bay Rust Lunch, June 28**](https://www.meetup.com/bostonrust/events/307936269)
* 2025-07-03 | Saint Louis, MO, US | [STL Rust](https://www.meetup.com/stl-rust/events/)
* [**Building Resilient and Observable Rust Services with steady_state**](https://www.meetup.com/stl-rust/events/306345853)
* 2025-07-06 | Boston, MA, US | [Boston Rust Meetup](https://www.meetup.com/bostonrust/events/)
* [**Alewife Rust Lunch, July 6**](https://www.meetup.com/bostonrust/events/307936287)
### Oceania
* 2025-06-11 | Sydney, NS, AU | [Rust Sydney](https://www.meetup.com/rust-sydney/events/)
* [**Crab time June 🦀**](https://www.meetup.com/rust-sydney/events/308325643)
* 2025-06-16 | Christchurch, NZ | [Christchurch Rust Meetup Group](https://www.meetup.com/christchurch-rustlang-meetup-group)
* [**Christchurch Rust Meetup**](https://www.meetup.com/christchurch-rustlang-meetup-group/events/307808896)
* 2025-06-24 | Barton, AU | [Canberra Rust User Group (CRUG)](https://www.meetup.com/rust-canberra)
* [**June CRUG Meetup**](https://www.meetup.com/rust-canberra/events/307520854)
### South America
* 2025-06-12 | Buenos Aires, AR | [Rust en Español](https://www.meetup.com/rust-argentina)
* [**Junio de WebAssembly!**](https://www.meetup.com/rust-argentina/events/307990465)
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>