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

• Project goals for 2025H2 | Rust Blog
• Announcing Rust 1.91.0 | Rust Blog

Foundation

• Announcing the Rust Foundation Maintainers Fund - The Rust Foundation

Newsletters

• Rust Trends Issue #71: Production Rust at Internet Scale
• This Month in Redox - October 2025 - Redox - Your Next(Gen) OS

Project/Tooling Updates

• Developing UEFI in Rust with Patina
• Announcing cgp-serde: A modular serialization library for Serde powered by CGP
• CGP v0.6.0 Release - Major ergonomic improvements for provider and context implementations
• esp-hal 1.0.0 release announcement

Observations/Thoughts

• Ghosts in the Compilation
• Patterns for Defensive Programming in Rust | corrode Rust Consulting
• Cloudflare with Edward Wang & Kevin Guthrie - Rust in Production
• Neural Networks with Candle
• Async Rust - Part 18 of Idiomatic Rust in Simple Steps
• The state of SIMD in Rust in 2025
• Rust is eating the world: From embedded firmware to cross-platform applications, databases and big servers
• [video] Building Next Generation Rail Systems With Rust: Tom Praderio of Parallel
• [video] Are we desktop yet? - Victoria Brekenfeld | EuroRust 2025
• [audio] Netstack.FM Episode 12 – Oxide Networking with Ryan Goodfellow

Rust Walkthroughs

• Rust Unit Testing Test Doubles: Fakes
• Building a Coding Agent in Rust: Implementing Chat Feature
• Image Classification in Rust with Tch-rs (Torch bindings)
• Inside Rust’s std and parking_lot mutexes - who wins?
• Positron - Only the Future Is Certain
• Getting Started with Rust and ClickHouse
• SocketAddrV6 is not roundtrip serializable · sunshowers
• Building Next Generation Rail Systems With Rust: Tom Praderio of Parallel
• Diesel Workshop Slides from RustWeek2025
• [video] Building Coding Agent in Rust | Implement Chat CLI | Part-2

Miscellaneous

• Can-t stop till you get enough

Crate of the Week

This week’s crate is dioxus, a framework for building cross-platform apps.

Thanks to llogiq for the 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, 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.

• Motor OS - Improve rush (the shell in Motor OS)
• Motor OS - Make imager configurable
• Motor OS - Port libc/llvm/rustc
• Diesel - Improve documentation for Postgres loading modes

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

480 pull requests were merged in the last week

Compiler

• rustc_codegen: fix musttail returns for cast/indirect ABIs
• accept trivial consts based on trivial consts
• add LLVM range attributes to slice length parameters
• adjust successor iterators
• allow check builds with binaries for the dummy codegen backend
• allow codegen backends to indicate which crate types they support
• better warning message for crate type unsupported by codegen backend
• contract variable declarations
• fix deferred cast checks using the wrong body for determining constness
• fix types being marked as dead when they are inferred generic arguments
• implement pin-project in pattern matching for &pin mut|const T
• miscellaneous const-generics-related fixes
• remove QPath::LangItem
• stabilize -Zno-jump-tables into -Cjump-tables=bool
• when a trait isn’t implemented, but another similar impl is found, point at it

Library

• add from_fn_ptr to Waker and LocalWaker
• add SliceIndex wrapper types Last and Clamp<Idx>
• constify Range functions
• constify trait aliases
• implement VecDeque extend_from_within and prepend_from_within
• implement VecDeque::extract_if
• implement strip_circumfix lib feature
• smart pointer (try_)map
• stabilize fmt::from_fn

Cargo

• build-analysis: JSONL-based logging infra
• build-analysis: emit timing-info log
• config-include: add optional field support
• config-include: support inline and array of tables
• support array of any types in Cargo config

Rustdoc

• search: Include extern crates when filtering on import
• Include attribute and derive macros when filtering on “macros”
• use configured target modifiers when collecting doctests

Clippy

• search_is_some: Fix when the closure spans multiple lines
• double_parens: don’t lint in proc-macros
• let_and_return: disallow _any_ text between let and return
• use_debug: don’t get confused by nested Debug impls
• incompatible_msrv: Don’t check the const MSRV for uncalled functions
• manual_unwrap_or(_default): don’t lint if not safe to move scrutinee
• extend needless_collect
• fix replace_box false positive when the box is moved
• improve doc comment code language tag parsing, don’t use a full parser

Rust-Analyzer

• add ide-assist: convert_range_for_to_while
• support memory profiling with dhat
• fix missing other assoc items for generate_blanket_trait_impl
• fix not applicable on while for replace_is_method_with_if_let_method
• canonicalize custom-target.json paths when fetching sysroot metadata
• consider more expression types as in_value
• expand literals with wrong suffixes into LitKind::Err
• false positive syntax errors on frontmatter
• fix handling of blocks modules that are not the root module
• improve error recovery when parsing malformed function return types
• properly support opaques
• resolve target-dir more precisely
• show proper async function signatures in the signature help

Rust Compiler Performance Triage

Mostly positive week. We saw a great performance win implemented by #148040 and #148182, which optimizes crates with a lot of trivial constants.

Triage done by @kobzol.

Revision range: 23fced0f..35ebdf9b

Summary:

(instructions:u)	mean	range	count
Regressions ❌ (primary)	0.8%	[0.1%, 2.9%]	22
Regressions ❌ (secondary)	0.5%	[0.1%, 1.7%]	48
Improvements ✅ (primary)	-2.8%	[-16.4%, -0.1%]	102
Improvements ✅ (secondary)	-1.9%	[-8.0%, -0.1%]	51
All ❌✅ (primary)	-2.1%	[-16.4%, 2.9%]	124

4 Regressions, 6 Improvements, 7 Mixed; 7 of them in rollups 36 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

• Emit error when using path-segment keyword as cfg pred
• stabilize extern_system_varargs
• Tracking issue for vec_into_raw_parts
• rustdoc: Erase #![doc(document_private_items)]
• Add new function_casts_as_integer lint
• resolve: Preserve ambiguous glob reexports in crate metadata
• Make deref_nullptr deny by default instead of warn
• Tracking Issue for const_mul_add

Compiler Team (MCPs only)

• remove support for typeof

Language Reference

• Guarantee the binary representation of isize explicitly

Leadership Council

• Proposal: Require all project team members to have Zulip IDs

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

• build-std: explicit dependencies
• build-std: always
• build-std: context

Upcoming Events

Rusty Events between 2025-11-05 - 2025-12-03 🦀

Virtual

• 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

• 2025-11-09 | 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, UK) | Women in Rust

• 👋 Community Catch Up

• 2025-11-12 | Virtual (Boulder, CO, US) | Boulder Elixir

• Integrating Elixir and Apache DataFusion with Rustler

• 2025-11-12 | 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 (Girona, ES) | Rust Girona | Silicon Girona

• Sessió setmanal de codificació / Weekly coding session

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

• Rust Study/Hack/Hang-out

• 2025-11-20 | Virtual (Berlin, DE) | Rust Berlin

• Rust Hack and Learn

• 2025-11-20 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup

• Tock, a Rust based Operating System Part #1

• 2025-11-23 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Rust Readers Discord Discussion: Macros

• 2025-11-25 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Fourth Tuesday

• 2025-11-25 | Virtual (London, UK) | Women in Rust

• Data-Intensive Systems in Rust: Safety, Speed, Concurrency

• 2025-11-26 | Virtual (Girona, ES) | Rust Girona | Silicon Girona

• Sessió setmanal de codificació / Weekly coding session

• 2025-11-30 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup

• Rust Readers Discord Discussion: Macros

• 2025-12-02 | Virtual (London, GB) | Women in Rust

• Advent of Code - Kick Off!

• 2025-12-03 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup

• Buffalo Rust User Group

• 2025-12-03 | Virtual (Girona, ES) | Rust Girona | Silicon Girona

• Sessió setmanal de codificació / Weekly coding session

• 2025-12-03 | Virtual (Indianapolis, IN, US) | Indy Rust

• Indy.rs - with Social Distancing

Africa

• 2025-11-11 | Johannesburg, ZA | Johannesburg Rust Meetup

• More on Rust types

Asia

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

• November 2025 Rustacean meetup

Europe

• 2025-11-05 | Bergen, NO | Hubbel kodeklubb

• Workshop c# - nr 1 av 2 - grunnleggende nivå

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

• Rust Girona Hack & Learn 11 2025

• 2025-11-05 | Köln, DE | Rust Cologne

• Rust in November: Small Crates Cult

• 2025-11-05 | Oslo, NO | Rust Oslo

• Rust Hack’n’Learn at Kampen Bistro

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

• Halloween special.

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

• Rust Gdansk Meetup #11

• 2025-11-06 | Vienna, AT | Rust Vienna

• Season 2 Kickoff | at metalab 🦀

• 2025-11-07 | Ostrava, CZ | TechMeetup Ostrava

• TechMeetup Ostrava Conference

• 2025-11-11 | London, UK | Rust London User Group

• Rust London x Zed Meetup

• 2025-11-11 | Stockholm, SE | Func Prog Sweden

• Func Prog Sweden 2025 at Kivra

• 2025-11-12 | Cambridge, UK | Cambridge Rust Meetup

• Monthly Rust Meetup

• 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

• 2025-11-14 | Stockholm, SE | Stockholm Rust

• Rust Meetup @Magello

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

• Topic TBD

• 2025-11-19 | Ostrava, CZ | TechMeetup Ostrava

• QA Circle

• 2025-11-20 | Aarhus, DK | Rust Aarhus

• Social Night

• 2025-11-20 | Amsterdam, NL | Rust Developers Amsterdam Group

• Rust Meetup @ Monumental X Zed

• 2025-11-20 | Luzern, CH | [Rust Luzern]((https://www.meetup.com/rust-luzern/)

• 2025 Rust Talks Luzern #3: Crate Walkthroughs @ Noser Engineering AG

• 2025-11-26 | Bergen, NO | Hubbel kodeklubb

• Workshop c# - nr 2 av 2 - grunnleggende nivå

• 2025-11-26 | Bern, CH | Rust Bern

• 2025 Rust Talks Bern #5 @Source Engineers

• 2025-11-27 | Barcelona, ES | BcnRust

• 19th BcnRust Meetup

• 2025-11-27 | Edinburgh, UK | Rust and Friends

• November Talks: Exotically Sized Types and ...

• 2025-11-28 | Prague, CZ | Rust Prague

• Rust Meetup Prague @ Barclays

• 2025-12-03 | Oxford, UK | Oxford ACCU/Rust Meetup.

• Rust/ACCU meetup.

North America

• 2025-11-06 | Montréal, QC, CA | Rust Montréal

• November Monthly Social

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

• Surprise

• 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

• 2025-11-20 | Seattle, WA, US | Seattle Rust User Group

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

• 2025-11-20 | Spokane, WA, US | Spokane Rust

• Monthly Rust Meetup: November

• 2025-11-26 | Austin, TX, US | Rust ATX

• Rust Lunch - Fareground

• 2025-12-02 | Chicago, IL, US | Chicago Rust Meetup

• Rust Talk December

Oceania

• 2025-11-11 | Christchurch, NZ | Christchurch Rust Meetup Group

• Christchurch Rust 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

If someone opens a PR introducing C++ to your Rust project, that code is free as in “use after”

– Predrag Gruevski on Mastodon

Thanks to Brett Witty 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