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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Official

• The next Rust All Hands
• This Development-cycle in Cargo: 1.90

Newsletters

• The Embedded Rustacean Issue #55

Project/Tooling Updates

• Bevy 0.17
• Linting Rust code in the kernel
• Fast UDP I/O for Firefox in Rust
• genedex: A Small and Fast FM-Index for Rust
• blogr v0.3.0 - Fast, lightweight static site generator with built in newsletter manager
• Feedr v0.2.0 - A feature-rich terminal-based RSS feed reader with a clean and intuitive TUI
• Glues v0.8.1 adds a browser TUI, proxy support, and redb storage
• Role Based Access Control in SeaORM 2.0

Observations/Thoughts

• On Choosing Rust
• The expression problem and Rust
• Case Study: How Proton uses Rust to build cross-platform applications for millions of people
• The Game Engine that would not have been made without Rust
• Introducing Rust To The Automotive Stack: A Conversation With Julius Gustavsson Of Volvo Cars
• Rust in Paris 2025 – Full Talks Playlist
• [video] How to Optimize Rust for Slowness: Inspired by New Turing Machine Results

Rust Walkthroughs

• Under the hood: Vec<T>
• Axum Backend Series: Implement JWT Access Token
• Level Up your Rust pattern matching
• [video] Sguaba: Type-safe spatial math in Rust

Miscellaneous

• Cloudflare just got faster and more secure, powered by Rust
• Rust: Who, What and Why for ESA SW PA Workshop

Crate of the Week

This week’s crate is blogr, a fast, lightweight static site generator.

Thanks to Gokul 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.

Rust

• FR: Add a –fail-fast option to libtest
• Testing instructions No calls for testing were issued this week by 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.

• Diesel - Feedback on an All About Select guide
• Diesel - Incomplete explanation for PgConnection loading modes
• Diesel - FromSqlRow derive macro fails when in scope where Ok is not the one from the standard library
• Diesel - fk_related_tables not working correctly with two foreign keys to same table 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

473 pull requests were merged in the last week

Compiler

• add an attribute to check the number of lanes in a SIMD vector after monomorphization
• add panic=immediate-abort
• skip stack overflow handler for panic=immediate-abort
• allow &raw [mut | const] for union field in safe code
• debuginfo: add an unstable flag to write split DWARF to an explicit directory
• detect tuple structs that are unconstructable due to re-export
• do not compute optimized MIR if code does not type-check
• do not materialise X in [X; 0] when X is unsizing a const
• improve diagnostics for empty attributes

Library

• BTreeMap: don’t leak allocators when initializing nodes
• constify {Mutex, RwLock, ReentrantLock}::data_ptr
• constify Default on Nanoseconds
• constify {float}::total_cmp()
• unstably constify float mul_add methods
• non-panicking Vec::try_remove
• fix infinite recursion in Path::eq with String
• implement hostname
• remove most #[track_caller] from allocating Vec methods

Cargo

• config: combine key error context into one
• shell: Use a distinct style for transient status
• add retry for git fetch failures in CARGO_NET_GIT_FETCH_WITH_CLI path
• better error message for rust version incompatibility
• sparse URLs in TomlLockfileSourceId
• use host-tuple for host target subsitution

Rustdoc

• Add support for associated items in “jump to def” feature
• add rustdoc doc_cfg features (RFC #3631)
• search: use the same ID for entry and path to same item
• hide #[repr] if it isn’t part of the public ABI
• put the toolbar on the all item index

Clippy

• double_parens: add structured suggestions, fix bug
• filter_next: check for filter().next_back()
• collapsible(_else)_if: respect #[expect] on inner if
• let_unit_value: create the suggestion “differentially”
• new_without_default: if new has #[cfg], copy that onto impl Default
• or_fun_call: respect MSRV for Result::unwrap_or_default suggestion
• should_implement_trait: only suggest traits that are in the prelude
• unnecessary_mut_passed: retain parens around the arguments
• check for proc macros from within explicit_deref_methods and do not lint on proc macro expansions
• fix new_without_default false positive on private type with trait impl
• overhaul mut_mut
• refactor module_style
• rename unchecked_duration_subtraction to unchecked_time_subtraction and check for Duration - Duration

Rust-Analyzer

• add all, any and not completions in #[cfg]
• add cfg_attr predicate completion
• add applicable on bang ! for apply_demorgan
• add const parameter keyword completion
• add let-chain support for convert_to_guarded_return
• allow &raw {mut, const} for union field
• fix “Replace match with if let” not to trigger when invalid transformations occur
• fix SCIP panicking due to salsa not attaching
• fix applicable on if-let-chain for invert_if
• fix expand rest pattern in tuple and slice pattern
• fix precedence parenthesis for replace_arith_op
• don’t turn unused variables into raw identifier
• implement fallback properly
• support negative integer literals in const generics in declarative macros

Rust Compiler Performance Triage

A relatively quiet week. Most of the improvements are to doc builds, driven by continued packing of the search index in rustdoc-search: stringdex update with more packing #147002 and simplifications to doc(cfg) in Implement RFC 3631: add rustdoc doc_cfg features #138907.

Triage done by @simulacrum. Revision range: ce4beebe..8d72d3e1

1 Regressions, 6 Improvements, 4 Mixed; 2 of them in rollups 29 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 const_slice_rotate
• implement Extend<{Group, Literal, Punct, Ident}> for TokenStream
• Stabilize char_max_len
• Add From impls for wrapper types
• prefer alias candidates for sizedness + auto trait goals
• Tracking Issue for NonZero<u*>::div_ceil
• Tracking issue for release notes of #146410: Iterator repeat: no infinite loop for last and count
• Stabilize rwlock_downgrade library feature
• Prevent downstream impl DerefMut for Pin<LocalType>
• Forbid freely casting lifetime bounds of dyn-types
• Fix accidental type inference in array coercion
• docs(style): Specify the frontmatter style
• core: simplify Extend for tuples No Items entered Final Comment Period this week for Rust RFCs, Cargo, Language Team, Language Reference, Leadership Council 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 2025-10-01 - 2025-10-29 🦀

Virtual

• 2025-10-01 | Virtual (Indianapolis, IN, US) | Indy Rust
• Indy.rs - with Social Distancing
• 2025-10-02 | Virtual (Girona, ES) | Rust Girona | Silicon Girona
• Sessió setmanal de codificació / Weekly coding session
• 2025-10-04 | Virtual (Kampala, UG) | Rust Circle Meetup
• Rust Circle Meetup
• 2025-10-05 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
• Rust Readers Discord Discussion: Macros
• 2025-10-07 | Virtual (Beijing, CN) | WebAssembly and Rust Meetup (Wasm Empowering AI)
• Monthly WasmEdge Community Meeting, the runtime for LLM/AGI
• 2025-10-09 - 2025-10-10 | Hybrid (Paris, FR) | EuroRust
• EuroRust 2025
• 2025-10-09 | Virtual (Berlin, DE) | Rust Berlin
• Rust Hack and Learn
• 2025-10-09 | Virtual (Girona, ES) | Rust Girona | Silicon Girona
• Sessió setmanal de codificació / Weekly coding session
• 2025-10-12 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
• Rust Readers Discord Discussion: Macros
• 2025-10-14 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
• Second Tuesday
• 2025-10-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
• Rust Study/Hack/Hang-out
• 2025-10-16 | Virtual (Girona, ES) | Rust Girona | Silicon Girona
• Sessió setmanal de codificació / Weekly coding session
• 2025-10-16 | Virtual (Nürnberg, DE) | Rust Nuremberg
• Rust Nürnberg online
• 2025-10-18 | Virtual (Gdansk, PL) | Stacja IT Trójmiasto
• [BEZPŁATNIE] Programowanie w języku Rust
• 2025-10-19 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
• Rust Readers Discord Discussion: Macros
• 2025-10-21 | Virtual (London, UK) | Women in Rust
• 👋 Community Catch Up
• 2025-10-21 | Virtual (Washington, DC, US) | Rust DC
• Mid-month Rustful
• 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

Asia

• 2025-10-02 | Seoul, KR | Seoul Rust (Programming Language) Meetup
• Seoul Rust Meetup
• 2025-10-04 | Bangalore, IN | Rust Bangalore
• October 2025 Rustacean meetup
• 2025-10-08 | Kuala Lumpur, MY | Rust Malaysia
• Malaysia Rust Meetup
• 2025-10-09 | Tokyo, JP | Tokyo Rust Meetup
• Building Pocket-Sized Terminal UIs with Rust
• 2025-10-20 | Tel Aviv-Yafo, IL | Rust 🦀 TLV
• In person Rust October 2025 at AWS in Tel Aviv

Europe

• 2025-10-01 | Köln, DE | Rust Cologne
• Rust in October: Undefined Rust
• 2025-10-01 | Olomouc, CZ | Rust Moravia
• 4. Rust Moravia Meetup (In the capital!)
• 2025-10-01 | Oxford, UK | Oxford ACCU/Rust Meetup.
• Building AI chatbots with Webassembly, Rust, and Leptos
• 2025-10-01 | Paris, FR | Paris Rustaceans
• Rust Meetup in Paris
• 2025-10-02 | Berlin, DE | Rust Berlin
• Rust Berlin on location 🏳️‍🌈 - Edition 007
• 2025-10-02 | Oslo, NO | Rust Oslo
• Rust Hack’n’Learn at Kampen Bistro
• 2025-10-08 | Girona, ES | Rust Girona
• Rust Girona Hack & Learn 10 2025
• 2025-10-08 | Paris, FR | Rust Paris
• Rust meetup #79
• 2025-10-08 | Reading, UK | Reading Rust Workshop
• Reading Rust Meetup
• 2025-10-09 - 2025-10-10 | Hybrid (Paris, FR) | EuroRust
• EuroRust 2025
• 2025-10-14 | Basel, CH | Rust Basel
• Rust Meetup #13 @ letsboot
• 2025-10-21 | Aarhus, DK | Rust Aarhus
• Hack Night
• 2025-10-21 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
• Topic TBD
• 2025-10-21 | London, UK | London Rust Project Group
• Rust in Surgery: Powering the Data Pipelines
• 2025-10-21 | Bergen, No | Rust Bergen
• Rust Meetup #01 @ Zrch
• 2025-10-28 | Manchester, UK | Rust Manchester
• Rust Manchester October Code Night

North America

• 2025-10-01 | Los Angeles, CA, US | Rust Los Angeles
• Web3 Developer Meetup
• 2025-10-02 | Montréal, QC, CA | Rust Montréal
• October Monthly Social
• 2025-10-02 | Mountain View, CA, US | Hacker Dojo
• RUST MEETUP at HACKER DOJO
• 2025-10-02 | Saint Louis, MO, US | STL Rust
• 🚁 Rust in Flight: Lessons from Designing a 3D‑Printed Quadcopter with Embedded
• 2025-10-04 | Boston, MA, US | Boston Rust Meetup
• North End Rust Lunch, Oct 4
• 2025-10-09 | Lehi, UT, US | Utah Rust
• Aya the Beholder: Writing an eBPF Firewall with the Aya Crate
• 2025-10-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
• Rust Study/Hack/Hang-out
• 2025-10-16 | Mountain View, CA, US | Hacker Dojo
• RUST MEETUP at HACKER DOJO
• 2025-10-21 | San Francisco, CA, US | Vara & Gear
• Rust Workshop by Vara Network
• 2025-10-21 | San Francisco, CA, US | San Francisco Rust Study Group
• Rust Hacking in Person
• 2025-10-22 | Austin, TX, US | Rust ATX
• Rust Lunch - Fareground
• 2025-10-23 | Nashville, TN, US | Music City Rust Developers
• Year In Review
• 2025-10-25 | Boston, MA, US | Boston Rust Meetup
• Porter Square Rust Lunch, Oct 25

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

• 2025-10-08 | Buenos Aires, AR | Rust en Español
• Octubre Async - Escribimos un Runtime desde Cero!
• 2025-10-25 | São Paulo, BR | Rust São Paulo Meetup
• Encontro do Rust-SP na Amazon Web Services 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 must personally extend my condolences to those who forgot they chose in the past to annoy their future self.

– @workingjubilee on github

Thanks to Riking 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

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Discuss on r/rust