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

• Demoting x86_64-apple-darwin to Tier 2 with host tools
• Leadership Council September 2025 Representative Selections
• Electing new Project Directors 2025

Newsletters

• This Month in Rust OSDev: July 2025
• The Embedded Rustacean Issue #52

Project/Tooling Updates

• Zed for Windows: What's Taking So Long?!
• SeaQuery just made writing raw SQL more enjoyable
• r3bl-cmdr v0.0.22
• r3bl_tui v0.7.4
• Heapless v0.9.1 - static friendly data structures that don't require dynamic memory allocation
• Announcing Asterinas 0.16.0

Observations/Thoughts

• Placing Arguments
• Update on our advocacy for memory-safety - Tweede golf
• Speed wins when fuzzing Rust code with #[derive(Arbitrary)]
• Rewriting Numaflow’s Data Plane: A Foundation for the Future
• Terminal sessions you can bookmark: Building Zellij's web client
• Testing failure modes using error injection
• Multiple Breakpoints in Rust: Ownership-Driven Debugger Design
• Lessons learned from rewriting the UltraGraph crate
• Scientific Computing in Rust
• RKL: A Docker-like Command-line Interface Built in Rust
• kruci: Post-mortem of a UI library
• Nine Rules for Generalizing Your Rust Library: Lessons from Extending RangeSetBlaze to Maps (Part 2)
• [audio] Intrusive lists for fun and profit

Rust Walkthroughs

• Constructor Best Practices in Rust
• Let's write a macro in Rust - Part 1
• Memory analysis in Rust

Miscellaneous

• Rust At Microsoft And Chairing The Rust Foundation
• Talking To Zed Industries- Makers Of The 100% Rust, Super-Performant, Collaborative Code Editor
• All the Rust Tutorials
• July 2025 Rust Jobs Report

Crate of the Week

This week's crate is tur, a turing machine emulator with text-mode user interface.

Despite a lack of suggestions, llogiq is very pleased with his choice.

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.

RFCs

Rust

Rustup

If you are a feature implementer and would like your RFC to appear on the above list, add the new 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.

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.

No calls for participation this week

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

390 pull requests were merged in the last week

Compiler

• compiler: allow extern "interrupt" fn() → !
• const-eval: full support for pointer fragments
• don't warn on never to any as casts as unreachable
• implement declarative macro_rules! derive macros (RFC #3698)
• implement #[derive(From)]
• more Printer cleanups
• tail call diagnostics to include lifetime info

Library

• add Ref/RefMut try_map method
• add Default impls for Pinned Box, Rc, Arc
• add ASCII-related methods from u8 and MIN/MAX to core::ascii::Char
• change the desugaring of assert! for better error output
• constify SystemTime methods
• implement ptr_cast_array
• migrate from cfg_if to cfg_select
• stabilize as_array_of_cells
• stabilize const_exposed_provenance feature
• stabilize core::iter::chain
• stabilize ip_from
• stabilize path_file_prefix feature
• stabilize sse4a and tbm target features
• thread: return error if setting thread stack size fails
• windows: replace GetThreadId+GetCurrentThread with GetCurrentThreadId

Cargo

• unstable: Added -Zbuild-dir-new-layout unstable feature
• unstable: add -Zbuild-analysis unstable feature
• package: Always reuse the workspace's target-dir
• add initial integration for --json=timings behind -Zsection-timings
• fix error while running the cargo clippy --all-targets -- -D warning
• implement host-target substitution
• more helpful error for invalid cargo-features = []
• stabilize build.build-dir

Rustdoc

• search: search backend with partitioned suffix tree
• allow multiple references to a single footnote
• correct negative-to-implicit discriminant display

Clippy

• similar_names stop linting for 3-char names
• unnecessary_operation: add space between stmts in suggestion
• {borrow,ptr}_as_ptr: don't lint inside proc-macros
• adjust declare_interior_mutable_const lint's category
• do not suggest to use implicit DerefMut on ManuallyDrop reached through unions
• fix match_ref_pats false positive on match scrutinee of never type
• fix unnecessary_semicolon: don't lint on stmts with attrs

Rust-Analyzer

• hint at unterminated strings in unknown prefix errors
• fix "Implement default members" to resolve IdentPat
• add if..else completions in LetStmt and ArgList
• fix indent for convert_match_to_let_else
• make lang items query properly filter out overwritten/excluded sysroots
• only import the item in "Unqualify method call" if needed
• support guards in replace_match_with_if_let
• track diagnostic generations per package
• next-solver fun time
• switch from Chalk to the next trait solver
• use a more specific error message when talking about the server logs

Rust Compiler Performance Triage

Lots of noise/bimodality this week. Overall though no major performance impacting changes landed.

Triage done by @simulacrum. Revision range: 6355cd39..239e8b1b

1 Regressions, 3 Improvements, 7 Mixed; 4 of them in rollups 27 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

• Partial-stabilize the basics from bigint_helper_methods
• fix drop scope for super let bindings within if let
• Make sure to treat only param where clauses as inherent

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

• [new] propose 2025h2 Goals

Upcoming Events

Rusty Events between 2025-08-20 - 2025-09-17 🦀

Virtual

• 2025-08-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2025-08-21 | Hybrid (Mexico City, MX) | Rust MX
  • Polars para análisis y manipulación de datos
• 2025-08-21 | Hybrid (Buenos Aires, AR) | Rust en Español
  • Agosto de Protocol Buffers!
• 2025-08-21 | Virtual (London, UK) | Conf42: Online Tech Events
  • Conf42 Rustlang 2025
• 2025-08-21 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2025-08-24 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Rust Atomics and Locks
• 2025-08-26 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2025-08-28 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-08-28 | Virtual (Los Angeles, CA, US) | Rust Los Angeles
  • AI-Powered Smart Contracts Workshop
• 2025-08-31 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Rust Atomics and Locks
• 2025-09-02 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group
• 2025-09-02 - 2025-09-05 | Hybrid (Seattle, WA, US) | RustConf
  • RustConf 2025
• 2025-09-02 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group
• 2025-09-03 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2025-09-06 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2025-09-07 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Rust Atomics and Locks
• 2025-09-09 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2025-09-09 | Virtual (London, UK) | Women in Rust
  • From First Lines to First Clients: Carol Nichols on Building a Career in Rust
• 2025-09-11 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-09-11 | Virtual (San Diego, CA, US) | San Diego Rust
  • San Diego Rust September 2025 Online Meetup
• 2025-09-14 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Rust Atomics and Locks
• 2025-09-16 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2025-09-17 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out

Asia

• 2025-08-20 | Seoul, KR | Seoul Rust
  • Seoul Rust Meetup
• 2025-08-21 | Kuala Lumpur, MY | Rust Malaysia
  • Malaysia Rust Meetup
• 2025-08-23 | Bangalore, IN | Rust Bangalore
  • August 2025 Rustacean meetup
• 2025-09-13 | Hangzhou, ZH, CN | WebAssembly and Rust Meetup (Wasm Empowering AI)
  • GOSIM AI Hangzhou 2025 (CFP is still open)

Europe

• 2025-08-21 | Oslo, NO | Rust Oslo
  • Rust Hack'n'Learn at Kampen Bistro
• 2025-08-28 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #60 sponsored by Bang & Olufsen
• 2025-08-28 | Edinburgh, GB | Rust and Friends
  • Rust and Friends (evening pub)
• 2025-08-28 | Manchester, UK | Rust Manchester
  • Rust Manchester August Code Night
• 2025-08-29 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (daytime coffee)
• 2025-08-30 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #16
• 2025-09-03 | Edinburgh, GB | Rust and Friends
  • Want a Squeezable / Modern / Helpful / Wide Language? Choose Four
• 2025-09-03 | Frankfurt, DE | Rust Rhein-Main
  • From bugs to parallelism to future-proofing: What makes Rust different
• 2025-09-04 | Gdansk, PL | Rust Gdansk
  • Rust Gdansk Meetup #10
• 2025-09-10 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup
• 2025-09-11 | Bern, CH | Rust Bern
  • 2025 Rust Talks Bern #4 @Zühlke
• 2025-09-16 | Berlin, DE | [Oxidize Conference] (https://oxidizeconf.com/)
  • Oxidize Conference
• 2025-09-16 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Topic TBD
• 2025-09-17 | Girona, ES | Rust Girona | Silicon Girona
  • Rust Girona Hack & Learn 09 2025

North America

• 2025-08-20 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2025-08-21 | Hybrid (Mexico City, MX) | Rust MX
  • Polars para análisis y manipulación de datos
• 2025-08-21 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-08-21 | Nashville, TN, US | Music City Rust Developers
  • Rust on Bare Metal Series 2 : Place Holder
• 2025-08-23 | Boston, MA, US | Boston Rust Meetup
  • Somerville Union Square Rust Lunch, Aug 23
• 2025-08-27 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2025-08-28 | Atlanta, GA, US | Rust Atlanta
  • We're going again!
• 2025-08-28 | Chicago, IL, US | Chicago Rust Meetup
  • Rust Happy Hour
• 2025-08-28 | Los Angeles, CA, US | Rust Los Angeles
  • Rust in Web3 Meetup
• 2025-09-02 - 2025-09-05 | Hybrid (Seattle, WA, US) | RustConf
  • RustConf 2025
• 2025-09-04 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-09-03 | Phoenix, AZ, US | Desert Rust
  • RustConf 2025 Watch Party (Day 1)
• 2025-09-04 | Phoenix, AZ, US | Desert Rust
  • RustConf 2025 Watch Party (Day 2)
• 2025-09-04 | Saint Louis, MO, US | STL Rust
  • emulation of retro systems (NES, Gameboy) in Rust
• 2025-09-06 | Boston, MA, US | Boston Rust Meetup
  • Beacon Hill Rust Lunch, Sep 6
• 2025-09-11 | Seattle, WA, US | Seattle Rust User Group
  • September, 2025 SRUG (Seattle Rust User Group) Meetup
• 2025-09-14 | Boston, MA, US | Boston Rust Meetup
  • Davis Square Rust Lunch, Sep 14
• 2025-09-16 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2025-09-17 | Charlottesville, VA, US | Charlottesville Rust Meetup
  • Tick, Tock, talk—find out how Rust secures embedded devices

Oceania

• 2025-08-26 | Barton, AU | Canberra Rust User Group
  • August Meetup
• 2025-08-27 - 2025-08-30 | Wellington, NZ | Rust Forge
  • Rust Forge

South America

• 2025-08-21 | Hybrid (Buenos Aires, AR) | Rust en Español | Rust Lang AR | Oxidar
  • Agosto de Protocol Buffers! | Live Stream

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

It's amazing how far const eval has come in #Rust. It wasn't too long ago that even a simple if/else wasn't permitted. Now we're not that far off from having const trait impls and const closures, which will make damn near everything const capable.

– Jacob Pratt on Mastodon

llogiq has looked at all zero suggestions and came up empty, so he just chose this quote instead.

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

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Discuss on r/rust