Info

This post is auto-generated from RSS feed This Week in Rust. Source: This Week in Rust 602

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.

Updates from Rust Community

Official

• Announcing five new members of the compiler team
• Redesigning the Initial Bootstrap Sequence

Project/Tooling Updates

• ICU4X 2.0 released!
• Freya 0.3
• godot-rust May 2025 dev update
• What's new in SeaORM 1.1.12
• git-cliff 2.9.0 is released!
• Ratatui's "Rat in the Wild" Challenge
• rust-analyzer changelog #288
• Ratatui Block Border Merging

Observations/Thoughts

• parking_lot: ffffffffffffffff...
• How to deal with Rust dependencies
• In Praise of Shuttle: Oxidizing the Capibara Web API
• Reducing Cargo target directory size with -Zno-embed-metadata
• Designing Error Types in Rust Libraries
• Why Use Structured Errors in Rust Applications?
• [video] The virtue of unsynn
• [audio] Proxying is just dumb routing
• [audio] David Lattimore - Faster Linker, Faster Builds
• [audio] Rust with Niko Matsakis
• [audio] SWC with DongYoon Kang
• [audio] AccessKit with Matt Campbell and Arnold Loubriat

Rust Walkthroughs

• C++ to Rust Phrasebook
• Async Traits Can Be Directly Backed By Manual Future Impls
• How we structure our build.rs in Rust
• [video] Start a new Bevy 2d Game with the Bevy CLI
• [video] Build with Naz : Parse non-slice input with nom

Research

• A first look at ROS 2 applications written in asynchronous Rust

Miscellaneous

• Rethinking Data Streaming With Rust And InfinyOn

Crate of the Week

This week's crate is context-logger, a lightweight, ergonomic library for adding structured context to your logs.

Thanks to Aleksey Sidorov 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 -Zrustdoc-depinfo
• Testing Instructions
• Tracking Issue for native-completion
• Testing Instructions
• Redefine CARGO_TARGET_DIR to be only an artifacts directory
• Testing Instructions
• cargo install --dry-run
• Testing Instructions
• cargo package --workspace is not very useful
• Testing Instructions
• cargo publish multiple packages at once

• Testing Instructions

• 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.

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 were submitted 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

529 pull requests were merged in the last week

Compiler

• fix spans for unsafe binders
• PGO new solver
• add additional TypeFlags fast paths
• add fast path for maybe-initializedness in liveness

Library

• redesign stage 0 std
• implement ((un)checked_)exact_div methods for integers
• add Range parameter to BTreeMap::extract_if and BTreeSet::extract_if
• add CStr::display
• add Result::map_or_default and Option::map_or_default
• add From<TryLockError> for io::Error
• add const support for float rounding methods
• add data_ptr method to Mutex and RwLock

Cargo

• trim-paths: remap all paths to build.build-dir
• fix cargo add overwriting symlinked Cargo.toml files

Rustdoc

• cleanups relating to allocations
• display doc(cfg(false)) properly
• linking to a local proc macro no longer warns
• use descriptive tooltip if doctest is conditionally ignored

Clippy

• explicit_deref_methods: do not lint on method chains
• needless_return: look inside else if parts as well
• while_let_loop: Include let assignment in suggestion
• add lint infallible_try_from
• clean-up modulo_arithmetic
• extend manual_is_variant_and lint to check for boolean map comparisons
• fix dbg_macro fail to handle async coroutine desugar
• fix semicolon_outside_block suggests wrongly when inside macros
• improve wording of manual_contains docs
• new restriction lint: pointer_format
• optimize unit_return_expecting_ord
• use interned symbols instead of strings in more places

Rust-Analyzer

• account for Generate actions when filtering the allowed ones
• add a quickfix for accessing a private field of a struct
• add support for type-erased Semantics<'db, dyn HirDatabase>, by use of DB: ?Sized
• enable assist edit for tuple<->named struct for the struct and visiblity keywords
• desugar assist for let pat = expr?; → let else
• enhance renaming to include identifier variations that are generated by macros
• render padding information when hovering on structs
• cycle handlers for HirDatabase::infer, const_param_ty_with_diagnostics
• fix IDE layer not resolving some macro calls
• fix import insertion not being fully cfg aware
• fix inference of AsyncFnX return type
• handle included files better in IDE layer
• recognize salsa cycles in thread_result_to_response
• skip pattern analysis on type mismatches

Rust Compiler Performance Triage

A fairly busy week, with lots of changes to performance. Most of the changes (at least in quantity of benchmarks) are attributable to an update of our PGO collection to newer benchmarks as part of the 2025 refresh.

Triage done by @simulacrum. Revision range: 2805e1dc..2fc3deed

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

• Add (back) unsupported_calling_conventions lint to reject more invalid calling conventions
• Stabilize if let guards (feature(if_let_guard))
• Added Clone implementation for ChunkBy
• Make the dangerous_implicit_autorefs lint deny-by-default
• Make NonZero< char > possible
• Tracking Issue for nonnull_provenance
• [disposition: close] Implement operations for Wrapping< T > where Rhs = T
• Split up the unknown_or_malformed_diagnostic_attributes lint
• Lint on fn pointers comparisons in external macros
• Specify the behavior of file!
• Document representation of Option<unsafe fn()>
• Stabilize feature(generic_arg_infer)
• Allow #![doc(test(attr(..)))] everywhere
• Tracking Issue for File lock API
• [disposition: unspecified] Tracking Issue for unsigned_signed_diff
• Stabilise os_string_pathbuf_leak

Rust RFCs

• [RFC] Add #[export_ordinal(n)] attribute

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

• [new] de-RFC: Remove unsized_locals
• [new] RFC: Procedural macros in same package as app
• [new] RFC: Allow generic impls using local trait bounds

Upcoming Events

Rusty Events between 2025-06-04 - 2025-07-02 🦀

Virtual

• 2025-06-04 | Virtual | Scientific Computing in Rust
  • Scientific Computing in Rust 2025
• 2025-06-04 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2025-06-05 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-06-07 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2025-06-08 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Async Rust
• 2025-06-10 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2025-06-10 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2025-06-11 | Virtual (Tel Aviv, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Rust at Work - conversation with Herbert Wolverson of Ardan Labs & LibreQoS
• 2025-06-12 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Meet, swap, and learn!
• 2025-06-15 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Async Rust
• 2025-06-17 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2025-06-18 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2025-06-19 | Hybrid (Redmond, WA, US) | Seattle Rust User Group
  • June, 2025 SRUG (Seattle Rust User Group) Meetup
• 2025-06-19 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-06-22 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Async Rust
• 2025-06-24 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2025-06-24 | Virtual (London, UK) | Women in Rust
  • Building Efficient Web Scrapers: Rust vs. Python for Data Ingestion
• 2025-06-26 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2025-06-29 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Readers Discord Discussion: Async Rust
• 2025-07-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing

Asia

• 2025-06-08 | Tel Aviv-yafo, IL | Rust 🦀 TLV
  • In person Rust June 2025 at AWS in Tel Aviv

Europe

• 2025-06-04 | Ghent, BE | Systems Programming Ghent
  • Grow smarter with embedded Rust
• 2025-06-04 | Köln, DE | Rust Cologne
  • Rust in June: A Decade of Rust
• 2025-06-04 | Oxford, UK | Oxford Rust Meetup Group
  • Risc V - the new challenger for cpus in AI and embedded systems.
• 2025-06-05 | München, DE | Rust Munich
  • Rust Munich 2025 / 2 - Hacking Evening
• 2025-06-10 | Cambridge, UK | Cambridge Rust Meetup
  • Monthly Rust Meetup
• 2025-06-10 | Warsaw, PL | Rust Warsaw
  • Rust Warsaw Meetup #5
• 2025-06-11 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup
• 2025-06-12 | Berlin, DE | Rust Berlin
  • Rust Berlin on location 🏳️‍🌈 - Edition 003
• 2025-06-17 | Leipzig, SN, DE | Rust - Modern Systems Programming in Leipzig
  • Topic TBD
• 2025-06-18 | Stockholm, SE | Stockholm Rust
  • Rust Meetup @Magello
• 2025-06-19 | Aarhus, DK | Rust Aarhus
  • Rust Aarhus meetup at Trifork
• 2025-06-19 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (evening pub)
• 2025-06-20 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (daytime coffee)
• 2025-06-24 | Manchester, UK | Rust Manchester
  • Rust Manchester June Code Night
• 2025-06-25 | London, UK | London Rust Project Group
  • Lessons learnt from making a tiny game in nostd Rust
• 2025-06-26 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #58
• 2025-07-02 | Basel, CH | Rust Basel
  • Rust Meetup #12 @ kHaus

North America

• 2025-06-05 | Chicago, IL, US | Chicago Rust Meetup
  • Rust Happy Hour
• 2025-06-05 | Saint Louis, MO, US | STL Rust
  • Leptos web framework
• 2025-06-08 | Boston, MA, US | Boston Rust Meetup
  • Boston University Rust Lunch, June 8
• 2025-06-11 | Phoenix, AZ, US | Desert Rust
  • Rust <> Security
• 2025-06-12 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-06-17 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2025-06-18 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2025-06-19 | Hybrid (Redmond, WA, US) | Seattle Rust User Group
  • June, 2025 SRUG (Seattle Rust User Group) Meetup
• 2025-06-19 | México City, MX | Rust MX
  • programación asíncrona en Rust usando Tokio
• 2025-06-19 | Nashville, TN, US | Music City Rust Developers
  • Using Rust For Web Series 3 : Final Presentations and Community Social
• 2025-06-20 | Boston, MA, US | Boston Rust Meetup
  • Lechmere Rust Lunch, June 20
• 2025-06-25 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2025-06-26 | Spokane, WA, US | Spokane Rust
  • Monthly Meetup: Making a CRUD API with Rust!
• 2025-06-28 | Boston, MA, US | Boston Rust Meetup
  • Back Bay Rust Lunch, June 28

Oceania

• 2025-06-16 | Christchurch, NZ | Christchurch Rust Meetup Group
  • Christchurch Rust Meetup
• 2025-06-24 | Barton, AU | Canberra Rust User Group
  • June Meetup

South America

• 2025-06-04 | Montevideo, UY | Rust Meetup Uruguay
  • Primera meetup de Rust de 2025!
• 2025-06-12 | Buenos Aires, AR | Rust en Español
  • Junio de WebAssembly!

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

Rust-based Python type checkers are like buses - you wait ages for one and then two come along at once.

– u/fiddle_n on r/rustjerk

Thanks to Brian Kung 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

🏷️ rust_feed