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Title: This Week in Rust 629
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Number: 629
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Date: 2025-12-10
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Category: This Week in Rust
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Hello and welcome to another issue of *This Week in Rust*!
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[Rust](https://www.rust-lang.org/) is a programming language empowering everyone to build reliable and efficient software.
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This is a weekly summary of its progress and community.
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Want something mentioned? Tag us at
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[@thisweekinrust.bsky.social](https://bsky.app/profile/thisweekinrust.bsky.social) on Bluesky or
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[@ThisWeekinRust](https://mastodon.social/@thisweekinrust) on mastodon.social, or
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[send us a pull request](https://github.com/rust-lang/this-week-in-rust).
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Want to get involved? [We love contributions](https://github.com/rust-lang/rust/blob/main/CONTRIBUTING.md).
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*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/).
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If you find any errors in this week's issue, [please submit a PR](https://github.com/rust-lang/this-week-in-rust/pulls).
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Want TWIR in your inbox? [Subscribe here](https://this-week-in-rust.us11.list-manage.com/subscribe?u=fd84c1c757e02889a9b08d289&id=0ed8b72485).
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## Updates from Rust Community
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<!--
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Dear community contributors:
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Please read README.md for guidance on submissions.
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Each submitted link should be of the form:
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* [Title of the linked Page](https://example.com/my_article)
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If you add a link to a non-text content please prefix it with `[video]` or `[audio]`:
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* [video] [Title of the linked video](https://example.com/my_video_article)
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* [audio] [Title of the linked audio file](https://example.com/my_podcast)
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If you don't know which category to use, feel free to submit a PR anyway
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and just ask the editors to select the category.
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-->
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### Official
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### Foundation
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### Newsletters
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### Project/Tooling Updates
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### Observations/Thoughts
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### Rust Walkthroughs
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### Research
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### Miscellaneous
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## Crate of the Week
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<!-- COTW goes here -->
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[Please submit your suggestions and votes for next week][submit_crate]!
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[submit_crate]: https://users.rust-lang.org/t/crate-of-the-week/2704
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## Calls for Testing
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An important step for RFC implementation is for people to experiment with the
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implementation and give feedback, especially before stabilization.
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If you are a feature implementer and would like your RFC to appear in this list, add a
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`call-for-testing` label to your RFC along with a comment providing testing instructions and/or
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guidance on which aspect(s) of the feature need testing.
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<!-- If there are new CfT items this week, include:
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[Repo Name](Repo URL)
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* [<Feature name>](<Feature URL>)
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* [Testing steps](<Testing Steps URL>)
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- and make note in the item so the authors know to remove the `call-for-testing` label:
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This RFC will appear in the **Call for Testing** section of the next issue (#) of This Week in Rust (TWiR).
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You may remove the `call-for-testing` label. Please feel free to leave the `call-for-testing` label in place if you would like this RFC to appear again in another issue of TWiR.
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- where `Repo Name` and `Repo URL` are one of:
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[Rust](https://github.com/rust-lang/rust/labels/call-for-testing),
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[Rust language RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing),
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[Cargo](https://github.com/rust-lang/cargo/labels/call-for-testing) or
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[Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing)
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- and `Testing steps` points directly to the procedures the item wants users to exercise.
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- For all `Repo Names` with no new CfT items this week: use (removing the repos for which new
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CfT items did appear, of course)
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* *No calls for testing were issued this week by
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[Rust](https://github.com/rust-lang/rust/labels/call-for-testing),
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[Rust language RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing),
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[Cargo](https://github.com/rust-lang/cargo/labels/call-for-testing) or
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[Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing).*
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-->
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[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.
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### [RFCs](https://github.com/rust-lang/rfcs/issues?q=label%3Acall-for-testing)
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### [Rust](https://github.com/rust-lang/rust/labels/call-for-testing)
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### [Rustup](https://github.com/rust-lang/rustup/labels/call-for-testing)
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If you are a feature implementer and would like your RFC to appear on the above list, add the new `call-for-testing`
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label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature
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need testing.
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## Call for Participation; projects and speakers
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### CFP - Projects
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Always wanted to contribute to open-source projects but did not know where to start?
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Every week we highlight some tasks from the Rust community for you to pick and get started!
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Some of these tasks may also have mentors available, visit the task page for more information.
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<!-- CFPs go here, use this format: * [project name - title of issue](URL to issue) -->
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<!-- * [ - ]() -->
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<!-- or if none - *No Calls for participation were submitted this week.* -->
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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 [Bluesky](https://bsky.app/profile/thisweekinrust.bsky.social) or [Mastodon](https://mastodon.social/@thisweekinrust)!
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[guidelines]:https://github.com/rust-lang/this-week-in-rust?tab=readme-ov-file#call-for-participation-guidelines
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### CFP - Events
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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.
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<!-- 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 -->
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<!-- or if none - *No Calls for papers or presentations were submitted this week.* -->
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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 [Bluesky](https://bsky.app/profile/thisweekinrust.bsky.social) or [Mastodon](https://mastodon.social/@thisweekinrust)!
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## Updates from the Rust Project
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<!-- Rust updates go here -->
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### Rust Compiler Performance Triage
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<!-- Perf results go here -->
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### [Approved RFCs](https://github.com/rust-lang/rfcs/commits/master)
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Changes to Rust follow the Rust [RFC (request for comments) process](https://github.com/rust-lang/rfcs#rust-rfcs). These
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are the RFCs that were approved for implementation this week:
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<!-- Use either
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* [Item title](Item URL)
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- or
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* *No RFCs were approved this week.*
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-->
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### Final Comment Period
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Every week, [the team](https://www.rust-lang.org/team.html) announces the 'final comment period' for RFCs and key PRs
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which are reaching a decision. Express your opinions now.
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#### Tracking Issues & PRs
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<!-- Either remove the group from the "No Items Entered Final Comment Period this week for" section
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and add the item(s) which entered Final comment period:
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##### [Group](Group URL)
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* [Item title](Item URL)
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- for `disposition-merge` `final-comment-period` items, or
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* [disposition: postpone]
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- for `disposition-postpone` `final-comment-period` items, or
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* [disposition: close]
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- for `disposition-close` `final-comment-period` items,
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* [disposition: unspecified]
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- when `disposition` is unspecified or ensure the group is a part of the
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"No Items Entered Final Comment Period this week for" section
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*No Items entered Final Comment Period this week for
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[Rust RFCs](https://github.com/rust-lang/rfcs/labels/final-comment-period),
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[Cargo](https://github.com/rust-lang/cargo/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc),
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[Compiler Team](https://github.com/rust-lang/compiler-team/issues?q=label%3Amajor-change%20%20label%3Afinal-comment-period) [(MCPs only)](https://forge.rust-lang.org/compiler/mcp.html),
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[Language Team](https://github.com/rust-lang/lang-team/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc+),
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[Language Reference](https://github.com/rust-lang/reference/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc),
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[Leadership Council](https://github.com/rust-lang/leadership-council/issues?q=state%3Aopen%20label%3Afinal-comment-period) or
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[Unsafe Code Guidelines](https://github.com/rust-lang/unsafe-code-guidelines/issues?q=is%3Aopen+label%3Afinal-comment-period+sort%3Aupdated-desc).*
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Let us know if you would like your PRs, Tracking Issues or RFCs to be tracked as a part of this list.
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-->
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#### [New and Updated RFCs](https://github.com/rust-lang/rfcs/pulls)
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<!-- Use either
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* [Item title](Item URL)
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- for new items, or
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* [updated] [Item title](Item URL)
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- for updated items, or
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* *No New or Updated RFCs were created this week.*
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-->
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<!-- Sample commit message
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Update CFT, FCP, MCP and RFC sections for TWiR-xxx
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-->
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## Upcoming Events
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Rusty Events between 2025-12-10 - 2026-01-07 🦀
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### Virtual
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* 2025-12-03 | Virtual (Buffalo, NY, US) | [Buffalo Rust Meetup](https://www.meetup.com/buffalo-rust-meetup)
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* [**Buffalo Rust User Group**](https://www.meetup.com/buffalo-rust-meetup/events/305304242/)
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* 2025-12-03 | Virtual (Indianapolis, IN, US) | [Indy Rust](https://www.meetup.com/indyrs)
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* [**Indy.rs - with Social Distancing**](https://www.meetup.com/indyrs/events/311886445/)
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* 2025-12-04 | Virtual (Berlin, DE) | [Rust Berlin](https://www.meetup.com/rust-berlin)
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* [**Rust Hack and Learn**](https://www.meetup.com/rust-berlin/events/306046643/)
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* 2025-12-05 | Virtual (Cardiff, UK) | [Rust and C++ Cardiff](https://www.meetup.com/rust-and-c-plus-plus-in-cardiff)
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* [**Rust & C++ Christmas Game Jam Kick-Off!**](https://www.meetup.com/rust-and-c-plus-plus-in-cardiff/events/311103307/)
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* 2025-12-06 | Virtual (Kampala, UG) | [Rust Circle Meetup](https://www.eventbrite.com/o/rust-circle-kampala-65249289033)
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* [**Rust Circle Meetup**](https://www.eventbrite.com/e/rust-circle-meetup-tickets-628763878687)
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* 2025-12-07 | Virtual (Cardiff, UK) | [Rust and C++ Cardiff](https://www.meetup.com/rust-and-c-plus-plus-in-cardiff)
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* [**Rust & C++ Christmas Game Jam Finale**](https://www.meetup.com/rust-and-c-plus-plus-in-cardiff/events/311103329/)
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* 2025-12-09 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
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* [**Second Tuesday**](https://www.meetup.com/dallasrust/events/305361537/)
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* 2025-12-10 | Virtual (Girona, ES) | [Rust Girona](https://lu.ma/rust-girona)
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* [**Sessió setmanal de codificació / Weekly coding session**](https://luma.com/li5de4ts)
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* 2025-12-11 | Hybrid (Seattle, WA, US) | [Seattle Rust User Group](https://www.meetup.com/join-srug)
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* [**December, 2025 SRUG (Seattle Rust User Group) Meetup**](https://www.meetup.com/seattle-rust-user-group/events/311351054/)
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* 2025-12-11 | Virtual (Nürnberg, DE) | [Rust Nuremberg](https://www.meetup.com/rust-noris)
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* [**Rust Nürnberg online**](https://www.meetup.com/rust-noris/events/310728572/)
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* 2025-12-16 | Virtual (Washington, DC, US) | [Rust DC](https://www.meetup.com/rustdc)
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* [**Mid-month Rustful**](https://www.meetup.com/rustdc/events/310002338/)
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* 2025-12-17 | Hybrid (Vancouver, BC, CA) | [Vancouver Rust](https://www.meetup.com/vancouver-rust)
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* [**Rust Study/Hack/Hang-out**](https://www.meetup.com/vancouver-rust/events/309926569/)
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* 2025-12-17 | Virtual (Girona, ES) | [Rust Girona](https://lu.ma/rust-girona)
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* [**Sessió setmanal de codificació / Weekly coding session**](https://luma.com/6v2rorp3)
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* 2025-12-18 | Virtual (Berlin, DE) | [Rust Berlin](https://www.meetup.com/rust-berlin)
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* [**Rust Hack and Learn**](https://www.meetup.com/rust-berlin/events/306046644/)
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* 2025-12-23 | Virtual (Dallas, TX, US) | [Dallas Rust User Meetup](https://www.meetup.com/dallasrust)
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* [**Fourth Tuesday**](https://www.meetup.com/dallasrust/events/305361448/)
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* 2025-12-25 | Virtual (Nürnberg, DE) | [Rust Nuremberg](https://www.meetup.com/rust-noris)
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* [**Rust Nürnberg online**](https://www.meetup.com/rust-noris/events/306046673/)
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### Asia
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* 2025-12-08 | Tokyo, JP | [Rust Global: Tokyo](https://rustfoundation.org/event/rust-global-tokyo/)
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* [**Rust Global: Tokyo**](https://rustfoundation.org/event/rust-global-tokyo/)
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* 2025-12-20 | Bangalore, IN | [Rust Bangalore](https://hasgeek.com/rustbangalore)
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* [**December 2025 Rustacean meetup**](https://hasgeek.com/rustbangalore/december-2025-rustacean-meetup/)
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### Europe
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* 2025-12-03 | Girona, ES | [Rust Girona](https://lu.ma/rust-girona)
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* [**Rust Girona Hack & Learn 12 2025**](https://luma.com/8ncu1p8l)
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* 2025-12-03 | Oxford, UK | [Oxford ACCU/Rust Meetup.](https://www.meetup.com/oxford-rust-meetup-group)
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* [**Rust/ACCU meetup.**](https://www.meetup.com/oxford-rust-meetup-group/events/311994790/)
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* 2025-12-04 | Vienna, AT | [Rust Vienna](https://www.meetup.com/rust-vienna)
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* [**Rust Vienna S2E2 - December | at metalab 🦀**](https://www.meetup.com/rust-vienna/events/311680386/)
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* 2025-12-06 | Stockholm, SE | [Stockholm Rust](https://www.meetup.com/stockholm-rust)
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* [**Ferris' Fika Forum #20**](https://www.meetup.com/stockholm-rust/events/312195848/)
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* 2025-12-08 | Dortmund, DE | [Rust Dortmund](https://www.meetup.com/rust-dortmund)
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* [**Rust Dortmund Meetup - December 2025**](https://www.meetup.com/rust-dortmund/events/312165912/)
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* 2025-12-08 | Paris, FR | [Rust Paris](https://www.meetup.com/rust-paris)
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* [**Rust meetup #81**](https://www.meetup.com/rust-paris/events/312004357/)
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* 2025-12-10 | London, UK | [Rust London User Group](https://www.meetup.com/rust-london-user-group)
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* [**Rust LDN Talks: Christmas Party with London Gophers & Red Badger**](https://www.meetup.com/rust-london-user-group/events/312264843/)
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* 2025-12-10 | München, DE | [Rust Munich](https://www.meetup.com/rust-munich)
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* [**Rust Munich 2025 / 4 - Hacking Evening**](https://www.meetup.com/rust-munich/events/307105932/)
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* 2025-12-10 | Reading, UK | [Reading Rust Workshop](https://www.meetup.com/reading-rust-workshop)
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* [**Reading Rust Meetup**](https://www.meetup.com/reading-rust-workshop/events/308944053/)
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* 2025-12-15 | Trondheim, NO | [Rust Trondheim](https://www.meetup.com/rust-trondheim)
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* [**Rust Advent of Code Hackathon**](https://www.meetup.com/rust-trondheim/events/312278650/)
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* 2025-12-16 | Bergen, NO | [Rust Bergen](https://www.meetup.com/bergen-rust-new-technology/events/)
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* [**Rust Bergen #3 @ Zrch**](https://www.meetup.com/de-de/bergen-rust-new-technology/events/312037597)
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* 2025-12-16 | Leipzig, SN, DE | [Rust - Modern Systems Programming in Leipzig](https://www.meetup.com/rust-modern-systems-programming-in-leipzig)
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* [**Topic TBD**](https://www.meetup.com/rust-modern-systems-programming-in-leipzig/events/308592258/)
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* 2025-12-19 | Lyon, FR | [Rust Lyon](https://www.meetup.com/rust-lyon)
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* [**Rust Lyon Meetup #11**](https://www.meetup.com/rust-lyon/events/312180836/)
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### North America
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* 2025-12-04 | México City, MX | [Rust MX](https://www.meetup.com/rust-mx/)
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* [**Optimizando rendimiento de Python con Rust**](https://www.meetup.com/rust-mx/events/312052780/)
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* 2025-12-04 | Saint Louis, MO, US | [STL Rust](https://www.meetup.com/stl-rust)
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* [**Actix Web Unleashed: Mastering State, Security, and Scalable Handlers in Rust**](https://www.meetup.com/stl-rust/events/311396006/)
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* 2025-12-05 | New York, NY, US | [Rust NYC](https://www.meetup.com/rust-nyc)
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* [**Rust NYC Unconf 2025: Our Biggest Event Yet!**](https://www.meetup.com/rust-nyc/events/311757146/)
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* 2025-12-06 | Boston, MA, US | [Boston Rust Meetup](https://www.meetup.com/bostonrust)
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* [**Downtown Rust Lunch, Dec 6**](https://www.meetup.com/bostonrust/events/311917263/)
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* 2025-12-10 | Chicago, IL, US | [Chicago Rust Meetup](https://www.meetup.com/chicago-rust-meetup)
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* [**Rust Happy Hour**](https://www.meetup.com/chicago-rust-meetup/events/312289655/)
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* 2025-12-11 | Hybrid (Seattle, WA, US) | [Seattle Rust User Group](https://www.meetup.com/join-srug)
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* [**December, 2025 SRUG (Seattle Rust User Group) Meetup**](https://www.meetup.com/seattle-rust-user-group/events/311351054/)
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* 2025-12-11 | Lehi, UT, US | [Utah Rust](https://www.meetup.com/utah-rust/)
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* [**Competetive Robotics with Rust**](https://www.meetup.com/utah-rust/events/311613704/)
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* 2025-12-11 | Mountain View, CA, US | [Hacker Dojo](https://www.meetup.com/hackerdojo/events/)
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* [**RUST MEETUP at HACKER DOJO**](https://www.meetup.com/hackerdojo/events/312103517/)
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* 2025-12-11 | San Diego, CA, US | [San Diego Rust](https://www.meetup.com/san-diego-rust)
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* [**San Diego Rust December Meetup - Back in person!**](https://www.meetup.com/san-diego-rust/events/312009598/)
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* 2025-12-13 | Boston, MA, US | [Boston Rust Meetup](https://www.meetup.com/bostonrust)
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* [**Alewife Rust Lunch, Dec 13**](https://www.meetup.com/bostonrust/events/311917267/)
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* 2025-12-16 | San Francisco, CA, US | [San Francisco Rust Study Group](https://www.meetup.com/san-francisco-rust-study-group)
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* [**Rust Hacking in Person**](https://www.meetup.com/san-francisco-rust-study-group/events/308865807/)
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* 2025-12-17 | Austin, TX, US | [Rust ATX](https://www.meetup.com/rust-atx)
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* [**Rust Lunch - Fareground**](https://www.meetup.com/rust-atx/events/312076080/)
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* 2025-12-17 | Hybrid (Vancouver, BC, CA) | [Vancouver Rust](https://www.meetup.com/vancouver-rust)
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* [**Rust Study/Hack/Hang-out**](https://www.meetup.com/vancouver-rust/events/309926569/)
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* 2025-12-17 | Spokane, WA, US | [Spokane Rust](https://www.meetup.com/spokane-rust)
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* [**Year-End Social Meetup w/ Python, Rust, and Others Local User Groups**](https://www.meetup.com/spokane-rust/events/312292668/)
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* 2025-12-20 | Boston, MA, US | [Boston Rust Meetup](https://www.meetup.com/bostonrust)
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* [**Back Bay Rust Lunch, Dec 20**](https://www.meetup.com/bostonrust/events/311917280/)
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### Oceania
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* 2025-12-11 | Brisbane City, QL, AU | [Rust Brisbane](https://www.meetup.com/rust-brisbane)
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* [**Rust Meetup Dec 2025**](https://www.meetup.com/rust-brisbane/events/312027415/)
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If you are running a Rust event please add it to the [calendar] to get
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it mentioned here. Please remember to add a link to the event too.
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Email the [Rust Community Team][community] for access.
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[calendar]: https://www.google.com/calendar/embed?src=apd9vmbc22egenmtu5l6c5jbfc%40group.calendar.google.com
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[community]: mailto:[email protected]
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## Jobs
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Please see the latest [Who's Hiring thread on r/rust](INSERT_LINK_HERE)
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# Quote of the Week
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<!-- QOTW goes here -->
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[Please submit quotes and vote for next week!](https://users.rust-lang.org/t/twir-quote-of-the-week/328)
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This Week in Rust is edited by:
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* [nellshamrell](https://github.com/nellshamrell)
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