fidzu : thunderbird

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

• Announcing Rust 1.96.1 | Rust Blog
• The many journeys of learning Rust | Rust Blog

Foundation

• Rust Foundation Trusted Training Program Launches, Giving Learners a Mark of Quality to Trust

Newsletters

• Scientific Computing in Rust #19 (June 2026)

Project/Tooling Updates

• Slint 1.17 Released
• rustc_codegen_gcc: Progress Report #42
• Introducing Test That!
• Introducing Test That!: A rich test assertion library for Rust from the original author of GoogleTest Rust
• Inside RSSH: one Rust crate, three binaries, and the Tauri lessons along the way
• Rustty 1.38 - accessibility & keyboard nav
• GuardianDB 0.17.0: Secure namespaces, Iroh 1.0, and the arrival of the ODM
• Building a real-time voice-agent runtime in Rust: no GIL, one binary, 2,000 calls a box
• AimDB: Bring Your Own Connector
• kache 0.8.0: zero-copy restores on Windows (ReFS)
• Warbell - a castle-defense action-RPG built with Bevy 0.19
• I built a macOS FTP client entirely in Rust - no Electron, no webview

Observations/Thoughts

• Hoisting Expressions
• The Unglamorous Side of Rust Web Development
• How I Found Out 52% of My Knowledge Graph Was Duplicates (and What I Did About It)
• A Novel Approach to Rust Error Handling
• We put a Redis server inside our runtime
• High-performance Rust: Understanding and eliminating memory fragmentation
• AI and worktrees are filling our disks: kache storage, measured
• Designing a cross-platform terminal memory visualizer in Rust
• Your Rust Service Isn't Leaking - It Could Be the Allocator

Rust Walkthroughs

• Measure, Don't Guess: Building viser, a Content-Adaptive Video Encoding Optimizer in Rust
• Learn SQL and SQLx by Building a Book Library CLI in Rust
• [series] Reasoning About Async Rust with State Machines
• The C to Rust Migration Book

Crate of the Week

This week's crate is deconvolution, a image deconvolution and restoration library.

Thanks to pbkx 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.

multicalc - good first issues

• AimDB - Add minimal example: hello-single-latest
• AimDB - Wire .transform() and .transform_join() into stage profiling
• edid-info - Increase test coverage with real EDID data
• edid-info - Finalize CTA-861 extension implementation
• edid-info - Support additional EDID extension block types

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

426 pull requests were merged in the last week

Compiler

• drop the full-crate AST walk in check_unused
• make stable_crate_ids reads lock-free after crate loading
• rework lint pass running
• simplify some proc_macro things

Library

• add io::ErrorKind::TooManyOpenFiles
• expand OptionFlatten's iterator methods
• move std::io::Error into core
• optimize network address parser

Cargo

• add -Zhint-msrv flag

Clippy

• filter_map_next: clean-up, overhaul suggestions
• chunks_exact_to_as_chunks: Prevent syntactically invalid suggestions
• chunks_exact_to_as_chunks: Use correct method name in message
• chunks_exact_to_as_chunks: Pick iter method depending on mut-ness
• non_ascii_literal, invisible_characters: don't suggest a fix on raw strings
• create a single ConstEvalCtxt in expr_eagerness
• detect new range types in higher::Range
• do not trigger manual_option_zip when map receiver is a lazy evaluated expression
• enhance needless_late_init to cover grouped assignments
• fix: borrow_as_ptr is triggered on generated code

Rust-Analyzer

• add diagnostic for E0596
• add fixes add '.await' for type_mismatch
• crash on lowering consts with associated types
• crash when hovering on anonymous consts
• only run Drop::drop when implemented
• mark inline_convert_while_ascii() as unsafe
• switch out lsp-types for gen-lsp-types

Rust Compiler Performance Triage

Overall, the week was fairly neutral, with no meaningful shift on most benchmarks on any of our statistics.

Triage done by @simulacrum. Revision range: 8b6558a0..7dc2c162

2 Regressions, 1 Improvement, 7 Mixed; 5 of them in rollups 34 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:

• No RFCs were approved 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

• Tracking Issue for LocalKey/Cell::update
• Tracking Issue for {str, [T], Path}::trim_prefix and {str, [T]}::trim_suffix
• Stabilize c-variadic function definitions
• Tracking Issue for layout information behind pointers
• Fix feature gate for repr(simd)
• reat no_mangle_generic_items as hard error instead of lint warning
• Lint against invalid POSIX symbol definitions
• Fix overflowing_literals lint with repeated negation
• stabilize extern "custom"
• Don't escape U+FF9E and U+FF9F in escape_debug_ext

Compiler Team (MCPs only)

• Decouple BackendRepr from ABI alignment
• MCP: Stabilization strategy for rustc parallel frontend

Language Reference

• Fields must fit in the type, even for repr(Rust)

Rust RFCs

• RFC: Associated const underscore
• Add extern "custom"

Unsafe Code Guidelines

• Opsem extension proposal: atomic volatile accesses

No Items entered Final Comment Period this week for Cargo, Language Team or Leadership Council.

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

• Method chain as item
• Add extern "custom"

Upcoming Events

Rusty Events between 2026-07-01 - 2026-07-29 🦀

Virtual

• 2026-07-01 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-07-02 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-07-02 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Learning Game Development the Hard Way with Rust and Bevy
• 2026-07-02 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-07-04 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2026-07-05 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: First Sunday
• 2026-07-07 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2026-07-14 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-07-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Jiff
• 2026-07-16 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • July, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-07-16 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-07-19 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: Third Sunday
• 2026-07-21 | Virtual (London, UK) | Women in Rust
  • Lunch & Learn: Learning Rust as First Programming Language
• 2026-07-21 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-07-28 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday

Asia

• 2026-07-18 | Bangalore, IN | Rust Bangalore
  • July 2026 Rustacean Meetup

Europe

• 2026-07-01 | Köln, DE | Rust Cologne
  • Rust in July: Vecs and Strings and Slices, Oh My!
• 2026-07-01 | Manchester, UK | Rust Manchester
  • Rust Manchester June Talks
• 2026-07-01 | Oxford, UK | Oxford ACCU/Rust Meetup.
  • Building a file system from scratch
• 2026-07-02 | Edinburgh, UK | Rust and Friends
  • Bevy, Bits, & Cats (Rust July Talks)
• 2026-07-02 | Enschede, NL | Baseflow Tech Meetups
  • AI Summit
• 2026-07-08 | Dublin, IE | Rust Dublin
  • Join us live and INPERSON for Rust 262
• 2026-07-09 | Switzerland, CH | PostTenebrasLab
  • Rust Meetup Geneva
• 2026-07-21 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Supercharge Rust funcs with implicit arguments and context-generic programming
• 2026-07-23 | Berlin, DE | Rust Berlin
  • Rust Berlin Talks: The next generation
• 2026-07-23 | London, UK | London Rust Project Group
  • Rama modular service framework for Rust
• 2026-07-23 | Paris, FR | Rust Paris
  • Rust meetup #87

North America

• 2026-07-02 | Saint Louis, MO, US | STL Rust
  • Git is easy?
• 2026-07-04 | Boston, MA, US | Boston Rust Meetup
  • Boston University Rust Lunch, July 4
• 2026-07-09 | Lehi, UT, US | Utah Rust
  • Utah Rust July Meetup
• 2026-07-11 | Boston, MA, US | Boston Rust Meetup
  • MIT Rust Lunch, July 11
• 2026-07-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Jiff
• 2026-07-16 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • July, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-07-18 | Boston, MA, US | Boston Rust Meetup
  • North End Rust Lunch, July 18
• 2026-07-21 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-07-22 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-07-22 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA: Rust in Distributed Systems with Flight Science!
• 2026-07-25 | Brooklyn, NY, US | Flower
  • BOG-A-THON 2

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!

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

I do rather hope anyone using -Zllvm-target-features or any stabilized form thereof would know that they are getting a conversation with the dragon directly and they should mind their words carefully if they do not wish to be barbecued by it and served over a nice plate of iron filings.

- workingjubilee on rust zulip

Thanks to Tomáš Šedovič for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by:

• nellshamrell
• llogiq
• ericseppanen
• extrawurst
• U007D
• mariannegoldin
• bdillo
• opeolluwa
• bnchi
• KannanPalani57
• tzilist

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

01 Jul 2026 4:00am GMT

Github Link

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

• Bug 1726931 - New issues should displayed on "My Dashboard" for first time users instead of assigned bugs
• Bug 1834454 - [WEBHOOKS] Webhooks for a product change don't fire if product is changed away from the target product
• Bug 1684509 - Have a single button to mark a bug as abusive/spam

Discuss these changes in the BMO Matrix Room

1 post - 1 participant

Read full topic

01 Jul 2026 12:55am GMT

The Rust team has published a new point release of Rust, 1.96.1. 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 1.96.1 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 1.96.1

Rust 1.96.1 fixes:

• Missing retries / timeouts in Cargo's HTTP client
• Miscompilation in a MIR optimization

It also fixes three CVEs affecting libssh2 (which is compiled into Cargo):

• CVE-2025-15661
• CVE-2026-55199
• CVE-2026-55200

Contributors to 1.96.1

Many people came together to create Rust 1.96.1. We couldn't have done it without all of you. Thanks!

30 Jun 2026 12:00am GMT