thunderbird

The Rust team has published a new point release of Rust, 1.97.1. Rust is a programming language that is empowering everyone to build reliable and efficient software.

If you have a previous version of Rust installed via rustup, getting Rust 1.97.1 is as easy as:

rustup update stable

If you don't have it already, you can get rustup from the appropriate page on our website.

What's in 1.97.1

Rust 1.97.1 fixes a miscompilation in an LLVM optimization.

We have backported both an LLVM fix and a disable of the underlying change in Rust 1.97.0 of Rust's generated IR that increased the likelihood of this happening. However, note that the underlying miscompilation has been present since at least Rust 1.87.

If you'd like to help us out by testing future releases, you might consider running your code's CI or locally using the beta channel (rustup default beta) or the nightly channel (rustup default nightly). Please report any bugs you might come across!

Contributors to 1.97.1

Many people came together to create Rust 1.97.1. We couldn't have done it without all of you. Thanks!

16 Jul 2026 12:00am GMT

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

Oxidize XIAO - An Embedded Rust Community Program

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.

Nika - showcase: CSV → chart PNG → markdown report (nika:chart has no example yet)

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:

Named Fn trait parameters

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

bf16 primitive type

Upcoming Events

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

South America

2026-08-08 | São Paulo, SP | Rust-SP
- Rust SP - Aug/2026

Oceania

2026-07-21 | Barton, AU | Canberra Rust User Group
- July Meetup
2026-07-23 | Perth, AU | Rust Perth Meetup Group
- Rust Perth: July Meetup!
2026-07-30 | Melbourne, AU | Rust Melbourne
- Rust Melbourne July 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

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

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:

Progress since the initial announcement of Thunderbird Pro and Thundermail
Many of the community's questions submitted via Reddit.
What we're working on next and what you can expect in the months ahead.

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

fidzu : thunderbird

16 Jul 2026

What's in 1.97.1

Contributors to 1.97.1

15 Jul 2026

14 Jul 2026

Resources