15 Jul 2026

feedPlanet Mozilla

This Week In Rust: This Week in Rust 660

Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tag us at @thisweekinrust.bsky.social on Bluesky or @ThisWeekinRust on mastodon.social, or send us a pull request. Want to get involved? We love contributions.

This Week in Rust is openly developed on GitHub and archives can be viewed at this-week-in-rust.org. If you find any errors in this week's issue, please submit a PR.

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Updates from Rust Community

Official
Project/Tooling Updates
Observations/Thoughts
Rust Walkthroughs
Miscellaneous

Crate of the Week

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

Thanks to JacobZ for the self-suggestion!

Please submit your suggestions and votes for next week!

Calls for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization.

If you are a feature implementer and would like your RFC to appear in this list, add a call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

No calls for testing were issued this week by Rust, Cargo, Rustup or Rust language RFCs.

Let us know if you would like your feature to be tracked as a part of this list.

Call for Participation; projects and speakers

CFP - Projects

Always wanted to contribute to open-source projects but did not know where to start? Every week we highlight some tasks from the Rust community for you to pick and get started!

Some of these tasks may also have mentors available, visit the task page for more information.

If you are a Rust project owner and are looking for contributors, please submit tasks here or through a PR to TWiR or by reaching out on Bluesky or Mastodon!

CFP - Events

Are you a new or experienced speaker looking for a place to share something cool? This section highlights events that are being planned and are accepting submissions to join their event as a speaker.

If you are an event organizer hoping to expand the reach of your event, please submit a link to the website through a PR to TWiR or by reaching out on Bluesky or Mastodon!

Updates from the Rust Project

550 pull requests were merged in the last week

Compiler
Library
Cargo
Clippy
Rust-Analyzer
Rust Compiler Performance Triage

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

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

Summary:

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

2 Regressions, 10 Improvements, 10 Mixed; 7 of them in rollups 36 artifact comparisons made in total

Full report here

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

Final Comment Period

Every week, the team announces the 'final comment period' for RFCs and key PRs which are reaching a decision. Express your opinions now.

Tracking Issues & PRs

Rust

Compiler Team (MCPs only)

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

Let us know if you would like your PRs, Tracking Issues or RFCs to be tracked as a part of this list.

New and Updated RFCs

Upcoming Events

Rusty Events between 2026-07-15 - 2026-08-12 🦀

Virtual
Asia
Europe
North America
South America
Oceania

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

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

- workingjubilee on Rust github

Thanks to Theemathas for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by:

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

15 Jul 2026 4:00am GMT

14 Jul 2026

feedPlanet Mozilla

Thunderbird Blog: Community Office Hours: A Thundermail Update

Our Community Office Hours series is all about connecting with the people behind Thunderbird and our products, and sharing the work that's happening behind the scenes. These conversations are a chance to learn more about the direction of our projects and to hear directly from the people making it happen.

In this episode, we are talking about Thundermail!

Since we first shared our plans for Thundermail, we have seen an incredible amount of excitement, curiosity, and thoughtful feedback from the community of early bird testers. In this Community Office Hours session, members of the Thunderbird team sit down to talk about the project's vision, share where things stand today, and answer some of the questions we've been getting along the way.

In this conversation, you'll hear about:

One of the best parts of Community Office Hours is the opportunity to have open conversations with our community. Your questions, ideas, and feedback help shape Thunderbird and its products, and we are excited to keep sharing updates as Thundermail continues to evolve.

Resources

Resources for Suggesting Features:

Thunderbird on Desktop and Mobile - https://connect.mozilla.org

Thundermail and Thunderbird Pro - https://ideas.tb.pro

Resources for diving into Thundermail:

Thundermail (and other services) roadmap: https://roadmaps.thunderbird.net/en-US/services/

Subreddit: https://www.reddit.com/r/ThunderbirdPro/

Thunderbird Pro addon repo that is now shipped natively in Thunderbird: https://github.com/thunderbird/tbpro-add-on

Thunderbird Accounts repo: https://github.com/thunderbird/thunderbird-accounts

Webmail client repo: https://github.com/thunderbird/stormbox

Appointment repo: https://github.com/thunderbird/appointment

Thundermail deployment repo: https://github.com/thunderbird/thundermail-deploy

SieveConnect repo: https://github.com/philpennock/sieve-connect

Resources for Getting Help with Thunderbird:

Thunderbird for Android Support Channel (Matrix) - https://matrix.to/#/#tb-android:mozilla.org

Thunderbird Desktop Support Channel (Matrix) - https://matrix.to/#/#thunderbird:mozilla.org

The post Community Office Hours: A Thundermail Update appeared first on The Thunderbird Blog.

14 Jul 2026 7:36pm GMT

Firefox Tooling Announcements: Happy BMO Push Day! (20260713.1)

Github Link

The following changes have been pushed to bugzilla.mozilla.org:

Discuss these changes in the BMO Matrix Room

1 post - 1 participant

Read full topic

14 Jul 2026 6:44pm GMT