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

• March Project Goals Update

Newsletters

• The Embedded Rustacean Issue #43

Project/Tooling Updates

• Shadertoys ported to Rust GPU
• Meilisearch 1.14 - composite embedders, embedding cache, granular filterable attributes, and batch document retrieval by ID
• rust-query 0.4: structural types and other new features

Observations/Thoughts

• Rebuilding Prime Video UI with Rust and WebAssembly
• ALP Rust is faster than C++
• what if the poison were rust?
• A surprising enum size optimization in the Rust compiler
• Two Years of Rust
• An ECS lite architecture
• A 2025 Survey of Rust GUI Libraries
• BTrees, Inverted Indices, and a Model for Full Text Search
• Cutting Down Rust Compile Times From 30 to 2 Minutes With One Thousand Crates
• SIMD in zlib-rs (part 1): Autovectorization and target features
• Avoiding memory fragmentation in Rust with jemalloc
• [video] Bevy Basics: Who Observes the Observer

Rust Walkthroughs

• Rust Type System Deep Dive From GATs to Type Erasure
• Async from scratch 1: What's in a Future, anyway? | natkr's ramblings
• Async from scratch 2: Wake me maybe | natkr's ramblings
• Building a search engine from scratch, in Rust: part 4
• Pretty State Machine Patterns in Rust
• [video] Build with Naz : Declarative macros in Rust

Miscellaneous

• March 2025 Jobs Report
• Rust resources

Crate of the Week

This week's crate is wgpu, a cross-platform graphics and compute library based on WebGPU.

Despite a lack of suggestions, llogiq is pleased with his choice.

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, 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.

• rama - add serve command to rama-cli
• rama - add support for include_dir for to ServeDir and related
• rama - add curl module to rama-http-types

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.

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

480 pull requests were merged in the last week

Compiler

• detect and provide suggestion for &raw EXPR
• don't suggest the use of impl Trait in closure parameter
• make the compiler suggest actual paths instead of visible paths if the visible paths are through any doc hidden path
• tell LLVM about impossible niche tags
• remove Nonterminal and TokenKind::Interpolated
• re-use Sized fast-path

Library

• add core::intrinsics::simd::{simd_extract_dyn, simd_insert_dyn}
• initial UnsafePinned implementation (Part 1: Libs)
• polymorphize array::IntoIter's iterator impl
• speed up String::push and String::insert
• std: add Output::exit_ok

Cargo

• added symlink resolution for workspace-path-hash
• improved error message when build-dir template var is invalid

Rustdoc

• search: add unbox flag to Result aliases
• enable Markdown extensions when looking for doctests

Clippy

• arbitrary_source_item_ordering should ignore test modules
• implicit_return: better handling of asynchronous code
• accept self.cmp(other).into() as canonical PartialOrd impl
• add manual_abs_diff lint
• consecutive returns dont decrease cognitive Complexity level anymore
• consider nested lifetimes in mut_from_ref
• correctly handle bracketed type in default_constructed_unit_struct
• deprecate match_on_vec_items lint
• do not propose to auto-derive Clone in presence of unsafe fields
• fix: iter_cloned_collect false positive with custom From/IntoIterator impl
• fix: map_entry: don't emit lint before checks have been performed
• fix: redundant_clone false positive in overlapping lifetime
• various fixes for manual_is_power_of_two

Rust-Analyzer

• ast: return correct types for make::expr_* methods
• add children modules feature
• add normalizeDriveLetter
• distribute x64 and aarch64 Linux builds with PGO optimizations
• fix dyn compatibility code bypassing callable_item_signature query
• fix a small bug with catastrophic effects
• fix an incorrect ExpressionStore that was passed
• prevent panics when there is a cyclic dependency between closures
• shadow type by module
• ignore errors from rustfmt which may trigger error notification
• port closure inference from rustc

Rust Compiler Performance Triage

Relatively small changes this week, nothing terribly impactful (positive or negative).

Triage done by @simulacrum. Revision range: e643f59f..15f58c46

1 Regressions, 3 Improvements, 3 Mixed; 2 of them in rollups 35 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

• Split elided_lifetime_in_paths into tied and untied
• check types of const param defaults
• Stabilize flags for doctest cross compilation
• Do not remove trivial SwitchInt in analysis MIR
• Implement a lint for implicit autoref of raw pointer dereference - take 2
• Implement Default for raw pointers
• make abi_unsupported_vector_types a hard error
• Stabilize let chains in the 2024 edition
• Make closure capturing have consistent and correct behaviour around patterns
• Stabilize the cell_update feature

Other Areas

• *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 2025-04-16 - 2025-05-14 🦀

Virtual

• 2025-04-16 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2025-04-17 | Virtual and In-Person (Redmond, WA, US) | Seattle Rust User Group
  • April, 2025 SRUG (Seattle Rust User Group) Meetup
• 2025-04-22 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2025-04-23 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Beyond embedded - OS development in Rust
• 2025-04-24 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-04-24 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Part 2: Quantum Computers Can’t Rust-Proof This!"
• 2025-05-03 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2025-05-05 | Virtual (Tel Aviv-Yafo, IL) | Rust 🦀 TLV
  • Tauri: Cross-Platform desktop applications with Rust and web technologies
• 2025-05-07 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2025-05-08 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-05-13 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday

Asia

• 2025-04-22 | Tel Aviv-Yafo, IL | Rust 🦀 TLV
  • In person Rust April 2025 at Braavos in Tel Aviv in collaboration with StarkWare

Europe

• 2025-04-19 | Istanbul, TR | Türkiye Rust Community
  • Rust Konf Türkiye
• 2025-04-23 | London, UK | London Rust Project Group
  • Fusing Python with Rust using raw C bindings
• 2025-04-24 | Aarhus, DK | Rust Aarhus
  • Talk Night at MFT Energy
• 2025-04-24 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (evening pub)
• 2025-04-24 | Manchester, UK | Rust Manchester
  • Rust Manchester April Code Night
• 2025-04-25 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (daytime coffee)
• 2025-04-26 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #11
• 2025-04-29 | London, UK | Rust London User Group
  • LDN Talks April 2025 Community Showcase
• 2025-04-29 | Paris, FR | Rust Paris
  • Rust meetup #76
• 2025-04-30 | Frankfurt, DE | Rust Rhein-Main
  • Kubernetes Operator in Rust
• 2025-05-01 | Nürnberg, DE | Rust Nuremberg
  • Hackers Hike 0x0
• 2025-05-06 - 2025-05-07 | Paris, FR | WebAssembly and Rust Meetup
  • GOSIM AI Paris 2025
• 2025-05-06 | Paris, FR | WebAssembly and Rust Meetup (Wasm Empowering AI)
  • GOSIM AI Paris 2025 (Discount available)
• 2025-05-07 | Madrid, ES | MadRust
  • VII Lenguajes, VII Perspectivas, I Problema
• 2025-05-07 | Oxford, UK | Oxford Rust Meetup Group
  • Oxford Rust and C++ social
• 2025-05-08 | Gdansk, PL | Rust Gdansk
  • Rust Gdansk Meetup #8
• 2025-05-08 | London, UK | London Rust Project Group
  • Adopting Rust (Hosted by Lloyds bank)
• 2025-05-13 | Amsterdam, NL | RustNL
  • RustWeek 2025 announcement
• 2025-05-13 - 2025-05-17 | Utrecht, NL | Rust NL
  • RustWeek 2025
• 2025-05-14 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup

North America

• 2025-04-17 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-04-17 | Nashville, TN, US | Music City Rust Developers
  • Using Rust For Web Series 1 : Why HTMX Is Bad
• 2025-04-17 | Redmond, WA, US | Seattle Rust User Group
  • April, 2025 SRUG (Seattle Rust User Group) Meetup
• 2025-04-22 | Detroit, MI, US | Detroit Rust
  • Rust Community Meet and Conference Report - Ann Arbor
• 2025-04-23 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2025-04-23 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground 2025-04-23 | Spokane, WA, US | Spokane Rust
  • Community Show & Tell at Fuel Coworking
• 2025-04-24 | Atlanta, GA, US | Rust Atlanta
  • 3rd 3RD TIME OMG YES!
• 2025-04-25 | Boston, MA, US | Boston Rust Meetup
  • Ball Square Rust Lunch, Apr 25
• 2025-05-01 | Saint Louis, MO, US | STL Rust
  • SIUE Capstone Project reflections on Rust
• 2025-05-03 | Boston, MA, US | Boston Rust Meetup
  • Boston Common Rust Lunch, May 3
• 2025-05-08 | México City, MX | Rust MX
  • Calculando con el compilador: Compiler time vs Run time
• 2025-05-08 | Portland, OR, US | PDXRust
  • Apache DataFusion: A Fast, Extensible, Modular Analytic Query Engine in Rust
• 2025-05-11 | Boston, MA, US | Boston Rust Meetup
  • Porter Square Rust Lunch, May 11

Oceania

• 2025-04-22 | Barton, AC, AU | Canberra Rust User Group
  • April 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

IEEE 754 floating point, proudly providing counterexamples since 1985!

– Johannes Dahlström on rust-internals

Thanks to Ralf Jung 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