Info

This post is auto-generated from RSS feed This Week in Rust. Source: This Week in Rust 607

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.

Want TWIR in your inbox? Subscribe here.

Updates from Rust Community

Official

• Stabilizing naked functions

Project/Tooling Updates

• toml v0.9
• Announcing dynify: Pin-init trait objects on the stack in stable Rust
• What's new in Ratatui 0.30.0?
• Introducing Tyr, a new Rust DRM driver
• RustFS: distributed object storage and MinIO alternative written in Rust
• Rama 0.3.0-alpha.1 - A Protocol Leap Forward
• Streaming data analytics, Fluvio 0.18.1 release

Observations/Thoughts

• Bootstrapping Rust with GCC
• The journey towards the best error handling in Rust web frameworks
• Unsoundness and accidental features in the #[target_feature] attribute
• Tree-Structured Concurrency II: Replacing Background Tasks With Actors
• Rapid Machine Learning Prototyping in Rust
• 330× faster: Four different ways to speed up your code
• Programming Extensible Data Types in Rust with CGP, Part 1 and Part 2
• Making Unsafe Rust a Little Safer: Find Memory Errors in Production with GWP-ASan
• Deterministic Simulation Testing in Rust: A Theater Of State Machines
• Slint Material Components Tech Preview
• Memory-safe malware: Rust challenges security researchers
• The scary and surprisingly deep rabbit hole of Rust's temporaries
• The 4 pillars of Rust's superiority

Rust Walkthroughs

• JavaScript is being rewritten in Rust
• Rust Security Best Practices 2025
• From 'It Might Work' to 'It Will Work': Typestate in Rust
• Tactical Trust (1 of 2): Platform Crypto for Developers in Rust

Crate of the Week

This week's crate is flac-coded, an implementation of (unsurprisingly) the Free Lossless Audio Codec (FLAC) file format.

Thanks to tuffy 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, Rust language RFCs, Cargo or Rustup.

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.

• rama - Implement all JWA algorithms
• rama - support X-Clacks-Overhead (response) http header
• rama - Feature Request: Dynamic Local IPv4/IPv6 Binding for TcpConnector
• rama - add curl module to rama-http-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 X (formerly Twitter) 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.

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 or by reaching out on X (formerly Twitter) or Mastodon!

Updates from the Rust Project

588 pull requests were merged in the last week

Compiler

• rewrite macro_rules! parser to not use the MBE engine itself
• loop match: fix 'no terminator on block'
• loop match: handle opaque patterns
• align attr fixes
• avoid suggesting traits from private dependencies
• detect more cases of unused_parens around types
• make metadata a workproduct and reuse it
• remove some unnecessary unsafe in VecCache
• start moving wf checking away from HIR

Library

• stabilize mixed_integer_ops_unsigned_sub
• add Vec::into_chunks
• add const Rem
• add methods for converting bool to Result<(), E>
• change {Box,Arc,Rc,Weak}::into_raw to only work with A = Global

Cargo

• publish: Stabilize multi-package publishing
• implement package feature unification
• report valid file name when we can't find a build target for name = "foo.rs"

Miri

• improve errors for type validity assertion failures
• shims::fs adding more fields to FileMetadata

Rustdoc

• fix rustdoc not correctly showing attributes on re-exports
• don't treat methods under const impls or traits as const

Clippy

• neg_multiply should preserve parenthesis when method is called
• doc_nested_refdefs: do not falsely report checkboxes as refdefs
• or_fun_call: also lint and method for Option/Result
• do not lint intrinsics as empty loops
• do not remove as if it changes the type
• don't remove explicit cast to trait object pointer
• fix std-instead-of-core false positive when not all items come from the new crate
• redundant_closure_call: lint for closures with block
• improve floating point lint to handle ambiguous type
• handle potentially-shadowing bindings in manual_let_else
• propagate accept-comment-above-attributes to statements
• return_and_then: prevent false positives in case of a partially used expression

Rust-Analyzer

• add AsMut, Borrow and BorrowMut to minicore and famous_defs
• add fn load_workspace_into_db variant for ra_ap_load_cargo's fn load_workspace
• always couple --compile-time-deps with
• include enum variants in world symbols
• fix a case where the link type was None
• fix diverging destructuring assignments
• fix some things with builtin derives
• honor rust-analyzer.cargo.noDeps option when fetching sysroot metadata
• improve diagnostic ranges for macro_calls!
• fix incorrect closure capturing for let exprs
• resolve HIR display length issues and improve adjustment tooltips
• resolve item in match bind
• improve flycheck and build script progress reporting
• re-enable fixpoint iteration for variance computation
• restructure proc-macro loading erros, differentiate hard error property on kind
• workaround missing none group support in builtin macros

Rust Compiler Performance Triage

Busy week. Results are dominated by changes that trade some wins for some losses in small incremental scenarios. We also had a lot of noise and spurious small changes on various PRs. Some regressions come from perf related work where we expect to get some wins back later.

Triage done by @panstromek. Revision range: ad3b7257..0d11be5a

Summary:

Note: We switched to a new benchmark machine at the begining of the period. We show summary based on slightly adjusted range 6988a8fe..8df4a58a to avoid misleading comparisons from different machines.

(instructions:u)	mean	range	count
Regressions ❌ (primary)	1.1%	[0.2%, 4.3%]	128
Regressions ❌ (secondary)	1.0%	[0.2%, 3.9%]	84
Improvements ✅ (primary)	-3.5%	[-7.2%, -0.2%]	48
Improvements ✅ (secondary)	-5.1%	[-42.6%, -0.2%]	68
All ❌✅ (primary)	-0.2%	[-7.2%, 4.3%]	176

3 Regressions, 3 Improvements, 11 Mixed; 6 of them in rollups 44 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:

• Declarative macro_rules! derive macros
• Declarative macro_rules! attribute macros

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 const_slice_reverse

Language Reference

• &str and &[u8] have the same layout

No Items entered Final Comment Period this week for Rust RFCs, Cargo, Language Team 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

• No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2025-07-09 - 2025-08-06 🦀

Virtual

• 2025-07-13 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Async Rust
• 2025-07-15 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2025-07-15 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2025-07-16 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2025-07-17 | Hybrid (Redmond, WA, US) | Seattle Rust User Group
  • July, 2025 Computer Programming Language Panel (Special Event)
• 2025-07-17 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-07-20 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Rust Atomics and Locks
• 2025-07-22 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2025-07-22 | Virtual (London, UK) | Women in Rust
  • Lunch & Learn: Crates, Tips & Tricks Lightning Talks - Bring your ideas!
• 2025-07-24 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2025-07-27 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Rust Atomics and Locks
• 2025-07-31 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-08-02 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2025-08-03 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Rust Atomics and Locks
• 2025-08-06 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing

Asia

• 2025-07-26 | Bangalore, IN | Rust Bangalore
  • July 2025 Rustacean meetup

Europe

• 2025-07-09 | Girona, ES | Rust Girona
  • Rust Girona Hack & Learn 07 2025
• 2025-07-09 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup
• 2025-07-10 | Berlin, DE | Rust Berlin
  • Rust Berlin on location 🏳️‍🌈 - Edition 004
• 2025-07-15 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Topic TBD
• 2025-07-15 | London, UK | London Rust Project Group
  • TUI Power: Simulating & Visualising Sensor Data with Rust
• 2025-07-23 | Dortmund, DE | Rust Dortmund
  • Rust Dortmund Meetup - Teach and Hack
• 2025-07-24 | Edinburgh, UK | Rust and Friends
  • July talks: A Crab, a Pufferfish and a State-of-the-art Chess AI
• 2025-07-24 | Nuremberg/Nürnberg, DE | Rust Nuremberg
  • Rust Nürnberg online
• 2025-07-29 | Manchester, UK | Rust Manchester
  • Lightning Talks July 2025
• 2025-07-29 | Prague, CZ | Rust Czech Republic
  • Nix Meetup at Braiins :)
• 2025-07-30 | Amsterdam, NL | Rust Developers Amsterdam Group
  • Rust Meetup @ BlockTech
• 2025-07-31 | Augsburg, DE | Rust Meetup Augsburg
  • Rust Meetup #14: Prof. Dr. Claudia Meitinger - Embassy - Möglichkeiten und Herausforderungen im Modul "Interdisciplinary Project"

North America

• 2025-07-09 | Phoenix, AZ, US | Desert Rust
  • Rust <> AI
• 2025-07-10 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-07-10 | Portland, OR, US | PDXRust
  • July 2025 PDX Rust Meetup
• 2025-07-15 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2025-07-16 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2025-07-17 | Chicago, IL, US | Chicago Rust Meetup
  • Rust Happy Hour
• 2025-07-17 | Hybrid (Redmond, WA, US) | Seattle Rust User Group
  • July, 2025 Computer Programming Language Panel (Special Event)
• 2025-07-17 | Nashville, TN, US | Music City Rust Developers
  • Rust on Bare Metal Series 1 : Introduction to Embedded Development
• 2025-07-23 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2025-07-24 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-07-31 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl

South America

• 2025-07-12 | São Paulo, BR | Rust São Paulo Meetup
  • Encontro do Rust-SP na WillBank
• 2025-07-17 | Florianópolis, BR | Rust Brazil + Rust Floripa
  • Rust Floripa

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

You might be asking: why did you rewrite [...] in Rust? And yeah, I don’t really have a good reason. It’s a hobby project. Like gardening, but with more segfaults.

– Collin Richards on their blog

Thanks to robin for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, U007D, joelmarcey, mariannegoldin, bennyvasquez, bdillo

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust

🏷️ rust_feed