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.

Official

• Announcing the New Rust Project Directors
• docs.rs: changed default targets
• Infrastructure Team 2025 Q3 Recap and Q4 Plan
• Renaming the default branch of rust-lang/rust

Newsletters

• Scientific Computing in Rust #11 (October 2025)

Project/Tooling Updates

• SeaORM 2.0: new entity format and relational capabilities
• Slint 1.14 Released
• Danube Messaging - new topic persistence architecture (Wal + Cloud)
• SierraDB: A Distributed Event Store Built in Rust
• Announcing C2Rust v0.21
• Shove Project Writeup
• ServiceRadar - Open Source Network Management and Observability
• fzf-make v0.65.0 is released! (A command line tool that executes commands using fuzzy finder)
• Diesel Code Audit Report

Observations/Thoughts

• Git considers SHA-256, Rust, LLMs, and more
• DebugFS on Rust
• Python and Rust interoperability
• Controlled Destruction in Rust: Towards Async Drop and Safer Resource Management
• Everybody’s so Creative!
• How we organized the Rust Clippy feature freeze
• Generalizing over mutability in Rust
• [audio] Netstack.FM Episode 10 – zerocopy with Joshua Liebow-Feeser

Rust Walkthroughs

• Real-Time Results in a Federated Query Engine
• Axum: Multi-tenancy (with Hexarch) and Abstracting the Repository
• Fixing rust-lang stdarch issues in LLVM - Blog - Tweede golf
• Rust unit testing: spies and dummy test doubles
• Axum Backend Series: Refresh Token Rotation and Reuse Detection
• Vibe Validation with Lean, ChatGPT-5, & Claude 4.5: Nine Rules for Proving (Rust) Algorithms Correct Without Knowing Formal Methods (Part 1)
• A Typed Evaluator in Rust
• Zero Cost Composition and the Power of GATs
• Integration Testing Rust Binary Crates
• [video] Build with Naz : How to speed up Rust compiler for different workflows

Miscellaneous

• September 2025 Rust Jobs Report

Crate of the Week

This week’s crate is extend_mut, a library to safely extend the lifetime of an exclusive reference under some constraints.P

Thanks to Oleksandr Babak 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.

Cargo * Tracking Issue for cargo-script RFC 3424 * Testing Steps

• No calls for testing were issued this week by Rust, Rust language RFCs 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.

• Diesel - Improve documentation for Postgres loading modes
• Diesel - Add support for currently unsupported postgres json/jsonb functions

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.

• TokioConf 2026| CFP closes 2025-12-08 | Portland, Oregon, USA | 2026-04-20

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

369 pull requests were merged in the last week

Compiler

• add a != check to ChunkedBitSet::union
• bitset cleanups
• deduced_param_attrs: check Freeze on monomorphic types
• deny-by-default never type lints
• improve error message for ambiguous numeric types in closure parameters
• remove boxes from AST list elements
• TaskDeps improvements
• unused_must_use: Don’t warn on Result<(), Uninhabited> or ControlFlow<Uninhabited, ()>
• use regular Vec in BitSet

Library

• const mem::drop
• constify basic Clone impls
• iter repeat: panic on last
• stabilise rotate_left and rotate_right in [_] as const fn items
• stabilize rwlock_downgrade library feature

Cargo

• check: Fix suggested command for bin package
• script: Remove name sanitiztion outside what is strictly required
• script: Tweak cargo script build-dir / target-dir

Rustdoc

• search: stringdex 0.0.2
• fix passes order so intra-doc links are collected after stripping passes

Clippy

• empty_enum: don’t lint if all variants happen to be cfg-d out
• option_option: split part of diagnostic message into help message
• unnecessary_safety_comment Some fixes regarding comments above attributes
• allow explicit_write in tests
• dereference argument of manual_div_ceil() if needed
• manual_rotate: also recognize non-consts
• overhaul mutex_{atomic,integer}

Rust-Analyzer

• parser: Don’t error on frontmatter
• improve fixture support
• fix invalid RestPat for convert_tuple_struct_to_named_struct
• fix missing RestPat for convert_named_struct_to_tuple_struct
• don’t make convert_to_guarded_return applicable on let-else
• fix signature_help to proto conversion creating invalid utf16 offsets
• support break with value in completions
• support else blocks with ! return type in convert_to_guarded_return
• support match inside if in pull_assignment_up
• migrate more stuff to the next solver
• migrate variance to the next solver and remove lint allows from its stuff
• rip Chalk out of the codebase 🎉
• support underscore suffix parameter hide inlayHints
• use FileId::MAX for id assertion in PathInterner::intern

Rust Compiler Performance Triage

Fairly busy week, with lots of mixed results. However, overall we ended with a slight improvement on average.

Triage done by @simulacrum. Revision range: 956f47c3..4068bafe

2 Regressions, 5 Improvements, 10 Mixed; 5 of them in rollups

39 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.

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 NEON fp16 intrinsics
• Change Location<’_> lifetime to ’static in Panic[Hook]Info
• Tracking Issue for substr_range and related methods
• repr(transparent): do not consider repr(C) types to be 1-ZST
• Don’t require T: RefUnwindSafe for vec::IntoIter<T>: UnwindSafe
• Stabilize -Zno-jump-tables into -Cjump-tables=bool
• Tracking issue for alloc_layout_extra
• Add warn-by-default lint for visibility on const _ declarations
• Tracking Issue for debug_closure_helpers
• fully deprecate the legacy integral modules
• Tracking Issue for fmt_from_fn
• Make IoSlice and IoSliceMut methods unstably const
• Tracking Issue for VecDeque::pop_front_if & VecDeque::pop_back_if
• [disposition: unspecified] [std][BTree] Fix behavior of ::append to match documentation, ::insert, and ::extend
• Impls and impl items inherit dead_code lint level of the corresponding traits and trait items
• Document MaybeUninit bit validity

Compiler Team (MCPs only)

• Move unreachable code lint from HIR type check to a proper lint
• Rename //@ add-core-stubs to //@ add-minicore
• Move annotation for profiling compiler-generated moves and copies.
• Use llvm-bitcode-linker as the default linker for nvptx64-nvidia-cuda

Leadership Council * Delegate GSoC money spending to the t-mentorship team

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

• No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2025-10-22 - 2025-11-19 🦀

Virtual

• 2025-10-22 | Virtual (Boulder, CO, US) | Boulder Elixir

• Integrating Elixir and Apache DataFusion with Rustler

• 2025-10-22 | Virtual (Buenos Aires, AR) | [Net-Baires] Comunidad de .NET en Buenos Aires

• Rust para devs .NET | Community Standup #10

• 2025-10-23 | Hybrid (Seattle/Bellevue, WA, US) | Seattle Rust User Group

• October, 2025 SRUG (Seattle Rust User Group) Meetup

• 2025-10-23 | Virtual (Berlin, DE) | Rust Berlin

• Rust Hack and Learn

• 2025-10-23 | Virtual (Girona, ES) | Rust Girona | Silicon Girona

• Sessió setmanal de codificació / Weekly coding session

• 2025-10-26 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Rust Readers Discord Discussion: Macros

• 2025-10-28 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Fourth Tuesday

• 2025-10-30 | Virtual (Girona, ES) | Rust Girona | Silicon Girona

• Sessió setmanal de codificació / Weekly coding session

• 2025-11-01 | Virtual (Kampala, UG) | Rust Circle Meetup

• Rust Circle Meetup

• 2025-11-02 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Rust Readers Discord Discussion: Macros

• 2025-11-05 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup

• Buffalo Rust User Group

• 2025-11-05 | Virtual (Indianapolis, IN, US) | Indy Rust

• Indy.rs - with Social Distancing

• 2025-11-05 | Virtual | Ardan Labs

• Mastering Error Handling in Rust: From Panics to thiserror & anyhow

• 2025-11-06 | Virtual (Berlin, DE) | Rust Berlin

• Rust Hack and Learn

• 2025-11-06 | Virtual (Girona, ES) | Rust Girona | Silicon Girona

• Sessió setmanal de codificació / Weekly coding session

• 2025-11-09 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Rust Readers Discord Discussion: Macros

• 2025-11-10 || BetterCode

• $betterCode() Industrielle Anwendungen mit Rust

• 2025-11-11 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Second Tuesday

• 2025-11-11 | Virtual (London, GB) | Women in Rust

• 👋 Community Catch Up

• 2025-11-13 | Virtual (Girona, ES) | Rust Girona | Silicon Girona

• Sessió setmanal de codificació / Weekly coding session

• 2025-11-13 | Virtual (Nürnberg, DE) | Rust Nuremberg

• Rust Nürnberg online

• 2025-11-16 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Rust Readers Discord Discussion: Macros

• 2025-11-18 | Virtual (Washington, DC, US) | Rust DC

• Mid-month Rustful

• 2025-11-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust

• Rust Study/Hack/Hang-out

Asia

• 2025-11-15 | Bangalore, IN | Rust Bangalore

• November 2025 Rustacean meetup

Europe

• 2025-10-23 | Edinburgh, UK | Rust and Friends

• Rust and Friends (evening pub)

• 2025-10-24 | Edinburgh, UK | Rust and Friends

• Rust and Friends (daytime coffee)

• 2025-10-28 | Manchester, UK | Rust Manchester

• Rust Manchester October Code Night

• 2025-10-29 | Dortmund, DE | Rust Dortmund

• Rust Dortmund Meetup October 2025

• 2025-10-30 | Copenhagen, DK | Copenhagen Rust Community

• Rust meetup #62 sponsored by Google!

• 2025-10-30 | Prague, CZ | Rust Prague

• Rust Meetup Prague (October 2025)

• 2025-11-01 | Stockholm, SE | Stockholm Rust

• Ferris’ Fika Forum #19

• 2025-11-02 - 2025-11-04 | Florence, IT | Rustlab 2025

• $Rustlab 2025

• 2025-11-03 | Bern, CH | Guild42

• Moving out of systems programming into Kubernetes: is it time to adopt Rust ?

• 2025-11-04 | Manchester, UK | Rust Manchester

• Rust Manchester November Talk

• 2025-11-04 | Trondheim, NO | Rust Trondheim

• Optimizing matrix multiplication and building Python packages with Rust

• 2025-11-05 | Girona, ES | Rust Girona | Silicon Girona

• Rust Girona Hack & Learn 11 2025

• 2025-11-05 | Oslo, NO | Rust Oslo

• Rust Hack’n’Learn at Kampen Bistro

• 2025-11-05 | Oxford, UK | Oxford ACCU/Rust Meetup.

• Rust/ACCU meetup.

• 2025-11-06 | Gdansk, PL | Rust Gdansk

• Rust Gdansk Meetup #11

• 2025-11-12 | Reading, UK | Reading Rust Workshop

• Reading Rust Meetup

• 2025-11-13 | Geneva, CH | Rust Geneva

• Rust Meetup Geneva

• 2025-11-13 | Paris, FR | Rust Paris

• Rust meetup #80

• 2025-11-18 | Leipzig, SN, DE | Rust - Modern Systems Programming in Leipzig

• Topic TBD

North America

• 2025-10-22 | Austin, TX, US | Rust ATX

• Rust Lunch - Fareground

• 2025-10-23 | Nashville, TN, US | Music City Rust Developers

• Year In Review

• 2025-10-23 | Hybrid (Seattle/Bellevue, WA, US) | Seattle Rust User Group

• October, 2025 SRUG (Seattle Rust User Group) Meetup

• 2025-10-23 | Spokane, WA, US | Spokane Rust

• October Rust Meetup: A Special Presentation and Monthly Meetups are Back!

• 2025-10-25 | Boston, MA, US | Boston Rust Meetup

• Porter Square Rust Lunch, Oct 25

• 2025-10-25 | Dallas, TX, US | Dallas Rust User Meetup

• In-person Meetup with Collin College Software Engineering Club!

• 2025-10-28 | Chicago, IL, US | Chicago Rust Meetup

• Rust Happy Hour

• 2025-10-29 | New York, NY, US | Rust NYC

• Rust NYC: Scalable static analysis: confronting the halting problem

• 2025-10-30 | Atlanta, GA, US | Rust Atlanta

• Rust-Atl

• 2025-10-30 | Mountain View, CA, US | Hacker Dojo

• RUST MEETUP at HACKER DOJO

• 2025-11-01 | Boston, MA, US | Boston Rust Meetup

• Chinatown Rust Lunch, Nov 1

• 2025-11-06 | Saint Louis, MO, US | STL Rust

• SIUE students on wasm 3D animations

• 2025-11-08 | Boston, MA, US | Boston Rust Meetup

• Winter Hill Rust Lunch, Nov 8

• 2025-11-13 | Lehi, UT, US | Utah Rust

• Ipmap: Building Desktop Apps with Tauri

• 2025-11-18 | San Francisco, CA, US | San Francisco Rust Study Group

• Rust Hacking in Person

Oceania

• 2025-10-22 | Perth, AU | Rust Perth Meetup Group

• October Meetup

• 2025-10-28 | Barton, AU | Canberra Rust User Group

• October Meetup

South America

• 2025-10-22 | Montevideo, UY | Rust Meetup Uruguay

• Rust Uruguay meetup de Octubre

• 2025-10-25 | São Paulo, BR | Rust São Paulo Meetup

• Encontro do Rust-SP na Amazon Web Services

• 2025-10-30 | Florianopolis, BR | Rust Brasil

• 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

There used to be recurring questions about mod vs use in the user forum, until I’ve added a note to the error message [...] and I think it largely solved the problem

– Kornel on rust-internals

Thanks to Noratrieb 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