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

• Announcing our first Maintainers in Residence
• Enabling the next-generation trait solver on nightly
• Supply chain attack on arrayref
• Rust Function Overloading - Call for Experimentation

Project/Tooling Updates

• Intent to Ship: JPEG XL – Mozilla Hacks - the Web developer blog

Observations/Thoughts

• Scaling Memory Safety: AI-Assisted Rewrites of C/C++ Dependencies to Rust
• Replacing a Rust Enum with a 64-bit Word Made My Interpreter 17% Faster
• 3 Seconds of compilation shaved by metadata analysis
• Your E-Paper Panel Isn't Broken: How Retained State Makes Drivers Look Buggy
• To Async or Not to Async: Building a Rust MCP Server for rust-analyzer
• One trie, three jobs, zero benchmarks won
• Fixing Rust's supply chain security: The good, the bad and the ugly

Rust Walkthroughs

• Rust errors every beginner hits
• Build a Scientific Calculator in Rust - Understanding Variables and Types
• Proving SQLx’s Statement Cache with bpftrace
• Beyond WASI: Rust applications in-browser

Miscellaneous

• JetBrains Partners with the Rust Foundation for an AI Livestream

Crate of the Week

This week's crate is swift-topomap, a microarchitectural observability tool.

Thanks to Ankur Rathore 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

• Tracking Issue for --remap-path-scope in rustdoc

Cargo

• Tracking Issue for -Zembed-metadata

No calls for testing were issued this week by Rustup or Rust language RFCs.

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.

• sysknife - Split the Ubuntu-only actions out of DEBIAN_ONLY_ACTIONS
• sysknife - Make Debian eligible: a version floor of 12, and a reason in is_supported
• sysknife - Debian's default firewall is nftables, and the catalogue has no nftables vocabulary

• stomatopod - Add a Docker Compose healthcheck on /health
• stomatopod - Add a custom GitHub social preview image
• stomatopod - Document the v0.1.0 GHCR tag next to :latest

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.

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

593 pull requests were merged in the last week

Compiler

• add a cache to the WfPredicates visitor
• allow self in const generics
• eliminate some buggy unreachable!()s in expand_(option_)env()
• enable -Znext-solver on nightly by default
• optimize DeepRejectCtxt

Library

• add Arc/Rc::strong_count_from_raw
• add Default implementation for std::sync::Once
• add symmetric PartialEq impls for Vec, &[T], &mut [T] versus Cow<'_, [T]>
• core: implement float conversion methods
• make BorrowedCursor<'a, T> covariant in 'a and drop an indirection
• rework div_ceil for nonzero integers
• stabilize bool::toggle
• stabilize never type

Cargo

• config: Add build.fingerprint
• fix git gc with safe.bareRepository=explicit
• install cargo tools with locked dependencies

Rustdoc

• add new invalid_markdown_table rustdoc lint
• only generate search DOM elements if the search is actually needed
• enable scrolling only on table/code
• fix issue preventing "read more" links from generating

Rustfmt

• fix ICE on for await loops with separated keyword tokens
• fix brace placement for multiline control flow
• fix comments rewritten too long
• correct the span used when rewriting ast::TyKind::FnPtr
• correct visibility and defaultness order on associated impl type alias
• inconsistent formatting of doc comments in macros

Clippy

• optimize Clippy with PGO
• unnecessary_fold: lint folding over an Option's iterator
• unused_trait_names: make the suggestion nicer
• avoid manual_assert_eq for byte slice-like types
• don't fire manual_contains when both sides use the slice element
• fix large_futures ICE with the next solver
• avoid double_must_use in macro-generated code
• make needless_bool less aggressive for chained ifs
• perf: check first_node_in_macro before the root macro walk in useless_format
• remove broken suggestion for blocks_in_conditions
• suggest hypot for x.mul_add(x, y * y).sqrt()
• suggest is_ok/is_err for boolean Result mappings
• trigger integer_division_remainder_used on DivAssign/RemAssign

Rust-Analyzer

• hir: Use expression store of parent body if available
• adds-arrow unmap ranges when fn inside macro
• allow asm! label blocks to diverge
• prevent stack overflow for recursive ADT layouts
• optimize the heck out of the storage of token trees
• use Cargo build directory for flycheck logs

Rust Compiler Performance Triage

A busy week, with a continued stream of improvements to the next trait solver and next borrow check implementations. Other than those changes, the week was pretty quiet for performance.

Triage done by @simulacrum. Revision range: 8fa1c96c..9a4ad59a

2 Regressions, 4 Improvements, 2 Mixed; 2 of them in rollups. 28 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

• make target feature ABI check a hard error on ARM
• stabilize smart pointer map functions
• volatile: allow accesses to non-AM memory to trap
• Stabilize the supertrait_item_shadowing feature
• Add intrinsics for integer minimum and maximum
• Always escape grapheme extenders in str::escape_debug

Rust RFCs

• Change i686-pc-windows-msvc from Tier 1 with host tools => Tier 1 without host tools

Cargo

• feat(resolver): Stabilize min-publish-age

Compiler Team (MCPs only)

• Add codeview_annotation intrinsic

Leadership Council

• Update PD election process based on 2025 feedback
• Create an LLM policy team

No Items entered Final Comment Period this week for 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

• Add core::ffi::c_longdouble
• RFC: add freeze operation

Upcoming Events

Rusty Events between 2026-08-26 - 2026-09-23 🦀

Virtual

• 2026-08-26 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Operating Systems Book Club: Lottery and Multi-CPU Scheduling
• 2026-08-27 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-28 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-31 | Virtual | Rust 🦀 Maven
  • Workshop: Add tests to an open source Rust project
• 2026-09-01 | Virtual | Rust 🦀 Maven
  • Tauri: Cross-Platform desktop applications with Rust and web technologies
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-04 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-06 | Virtual | Rust 🦀 Maven
  • Facts: Curated Knowledge for Humans and Agents
• 2026-09-06 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: First Sunday
• 2026-09-08 - 2026-09-11 | Hybrid (Montreal, CA) | RustConf 2026
  • RustConf 2026
• 2026-09-08 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-09-08 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2026-09-10 | Virtual | Rust 🦀 Maven
  • Solving Real-World Planning Problems in Rust with SolverForge
• 2026-09-10 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-09-10 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-09-15 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-09-16 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2026-09-17 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • September, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-09-18 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-20 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: Third Sunday
• 2026-09-22 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday Rust Bookclub

Africa

• 2026-09-08 | Johannesburg, ZA | Johannesburg Rust Meetup
  • Rust's extended standard library

Asia

• 2026-08-29 | Pune, IN | Rust Pune
  • Rust Pune Meetup: August 2026

Europe

• 2026-08-26 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #71 Sponsored by Factbird
• 2026-08-26 | Dresden, DE | Rust Dresden
  • Third Meetup
• 2026-08-27 | London, UK | Rust London User Group
  • LDN Talks August Community Showcase
• 2026-08-27 | Manchester, UK | Rust Manchester
  • Rust Manchester August Talks
• 2026-08-29 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #29
• 2026-09-08 | Paris, FR | Rust Paris
  • Rust meetup #87
• 2026-09-14 - 2026-09-16 | Berlin, DE | Oxidize 2026
  • Oxidize 2026
• 2026-09-15 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Reproducing scientific papers - with Rust & "AI"
• 2026-09-22 | Prague, CZ | Rust Prague
  • Rust Meetup Prague @ Rockwell Automation

North America

• 2026-08-26 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-08-26 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA August! Rust in Quantum Computing
• 2026-08-27 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-09-03 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-09-03 | Saint Louis, MO, US | STL Rust
  • Cryptography + Quantum Computers
• 2026-09-08 - 2026-09-11 | Hybrid (Montreal, CA) | RustConf 2026
  • RustConf 2026
• 2026-09-09 | Montreal, CA | Women in Rust
  • RustConf Coffee Break Meetup
• 2026-09-10 | Lehi, UT, US | Utah Rust
  • Hands-on Embedded Rust
• 2026-09-10 | San Diego, CA, US | San Diego Rust
  • San Diego Rust September Meetup - Back in person!
• 2026-09-15 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-09-16 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2026-09-17 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • September, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-09-17 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-09-23 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground

Oceania

• 2026-08-27 | Melbourne, AU | Rust Melbourne
  • Rust Melbourne August 2026

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 care about this community, including its human and social nature. I want others to appreciate those qualities, and I don't want to see them compromised and replaced by excessive machine-generated content.

– Quine Dot on rust-users

Thanks to Jonas Fassbender 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