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 on X (formerly Twitter) 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

• Rust participates in Google Summer of Code 2025
• February Project Goals Update
• Announcing Rustup 1.28.0

Newsletters

• This Month in Rust OSDev: February 2025
• Rust Trends Issue #60
• The Embedded Rustacean Issue #40

Project/Tooling Updates

• Announcing Wiremocket: Wiremock For Websockets
• A More Modular reqwest
• memberlist 0.6 - gossip protocol for cluster membership management
• Maelstrom Clustered Test Runner v0.13: new watch mode and GitHub workflow support
• Bincode 2.0.0

Observations/Thoughts

• The problem with type aliases
• Take a break: Rust match has fallthrough
• Fast columnar JSON decoding with arrow-rs
• Some things that make Rust lifetimes hard to learn
• Performance optimization, and how to do it wrong
• Do not run any Cargo commands on untrusted projects
• Cargo's missing stability guarantees
• [video] Rust Under the Hood
• [video] 9 Rules for Porting Rust to the Browser

Rust Walkthroughs

• The power of interning: making a time series database 2000x smaller in Rust
• Lowering Top Level Items
• Building a DNS Server in Rust: Part 1 of 2

Miscellaneous

• [video] Rust's Global Allocator
• [video] Vulkanised 2025: Shipping a Game with Vulkan and Rust in 100 Days
• [video] Creating a website on GitHub pages with mdBook
• EuroRust 2025 Paris announced
• Please nominate newer innovative projects for GOSIM Rust Spotlight ASAP!

Crate of the Week

This week's crate is wild, a pretty fast linker written in Rust.

Thanks to Mateusz Mikuła for the (sort of 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.

• 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.

EuroRust 2025| 2025-05-15 | Paris | 2025-10-09–2025-10-10

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

502 pull requests were merged in the last week

Compiler

• introduce feature(generic_const_parameter_types)
• fix parsing of ranges after unary operators
• implement #[cfg] in where clauses
• optimize empty provenance range checks

Library

• add IntoBounds::intersect and RangeBounds::is_empty
• fix Windows Command search path bug
• stabilize core::str::from_utf8_mut as const
• stabilize extract_if
• stabilize hash_extract_if

Cargo

• cargo: add SBOM support (RFC #3553)
• cargo: cli: forward bash completions of third party subcommands
• cargo: add completions for --lockfile-path
• cargo: reset $CARGO if the running program is real cargo[.exe]
• cargo: get all members as available targets even though default-members was specified
• cargo: implemented build.build-dir config option

Rustdoc

• librustdoc: return impl fmt::Display in more places instead of writing to strings
• fully qualify Result in generated doctest code

Rustfmt

• use semver to match required version

Clippy

• new lints: manual_midpoint, add unnecessary_debug_formatting lint
• move comparison_chain from style to pedantic
• macro_use_import: Don't check is attribute comes from expansion
• manual_strip: use existing identifier instead of placeholder
• needless_collect: avoid warning if non-iterator methods are used
• check for MSRV attributes in late passes using the HIR
• configuration option to lint incompatible_msrv in test code
• extend {implicit,inverted}_saturating_sub to expressions
• fix ICE in doc_nested_refdefs check by checking range
• fix ICE in manual_map lint
• fix: map_entry false positive inside closure
• fix: map_entry suggest wrongly when key is not Copy
• lint more cases with ptr_eq
• split needless_lifetime '_ suggestions into elidable_lifetime_names

Rust-Analyzer

• rust-analyzer: add identifier to pull diagnostic LSP capabilities
• rust-analyzer: add anchor for intra-doc links to associated items
• rust-analyzer: add flip or-pattern assist
• rust-analyzer: allow "package/feature" format feature flag
• rust-analyzer: allow rust-project.json to specify sysroot workspace
• rust-analyzer: allow unsetting default cfgs
• rust-analyzer: cofigurate out ohos target to avoid compilation crashes
• rust-analyzer: completion-ref-matching
• rust-analyzer: doc tests
• rust-analyzer: doc: remove nit from setup.md
• rust-analyzer: fix prefix adjustment hints unnecessarily introducing parens
• rust-analyzer: fix sysroot crate-graph construction not mapping crate-ids for proc-macros
• rust-analyzer: have inline_local_variable use precedence calculation for parentheses
• rust-analyzer: remove syntax editing from parenthesis computation
• rust-analyzer: support tuple struct patterns for expand_rest_pattern assist
• rust-analyzer: warn when the used toolchain looks too old for rust-analyzer

Rust Compiler Performance Triage

A pretty quiet week, with minimal changes in performance (positive or negative).

Triage done by @simulacrum. Revision range: f5729cfe..daf59857

1 Regressions, 4 Improvements, 1 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.

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

• Denote ControlFlow as #[must_use]
• Turn order dependent trait objects future incompat warning into a hard error
• Stabilize const_vec_string_slice
• add a "future" edition
• Tracking Issue for const_sockaddr_setters

Rust RFCs

• RFC: Deprecate the per-build-target edition field in Cargo.toml
• RFC: Demote i686-pc-windows-gnu to Tier 2

Cargo

• feat(package): add --exclude-lockfile flag

Other Areas

• *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

• Local Default Bounds to assist Forget and other ?Trait.
• Forget marker trait
• RFC: Crate changelog field

Upcoming Events

Rusty Events between 2025-03-05 - 2025-04-02 🦀

Virtual

• 2025-03-05 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2025-03-06 | Virtual (Nürnberg, DE) | Rust Nurnberg DE
  • Rust Nürnberg online
• 2025-03-06 | Virtual (Rotterdam, NL) | Bevy Game Development
  • Bevy Meetup #9
• 2025-03-06 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Ratatui - Terminal User Interfaces in Rust with Orhun Parmaksız
• 2025-03-09 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Creating A Mock Blockchain in Rust with Sourav Mishra
• 2025-03-09 | Virtual (Tel Aviv-Yafo, IL) | Rust 🦀 TLV
  • Becoming a Rust Champion: Leading Your Team to Success with Yoni Peleg
• 2025-03-11 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2025-03-11 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2025-03-13 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-03-18 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • crum: Complex Numbers and Complex Matrices in Rust with Frans Slabber
• 2025-03-18 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2025-03-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Bacon & Performance Benchmarking
• 2025-03-20 | Virtual (Tel Aviv-Yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Rust and embedded programming with Leon Vak (online in English)
• 2025-03-25 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2025-03-25 | Virtual (London, UK) | Women in Rust
  • Lunch & Learn: SKIing into Rust - crafting a simple interpreter
• 2025-03-27 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2025-04-01 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group
• 2025-04-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing

Africa

• 2025-03-11 | Johannesburg, ZA | Johannesburg Rust Meetup
  • The Stages of Error Management

Asia

• 2025-03-15 | Beijing, CN | WebAssembly and Rust Meetup (Wasm Empowering AI)
  • KCD Beijing 2025
• 2025-03-19 | Tel Aviv-Yafo, IL | Rust 🦀 TLV
  • In person Rust March 2025 at Jit in Tel Aviv
• 2025-03-28 | Kowloon Tong, HK | Rust Asia
  • Rust Asia 2025

Europe

• 2025-03-05 | Barcelona, ES | BcnRust
  • 17th BcnRust Meetup
• 2025-03-05 | Köln, DE | Rust Cologne
  • Rust in March: Rust Edition 2024
• 2025-03-05 | Oxford, UK | Oxford Rust Meetup Group
  • Hackathon
• 2025-03-07 | Prague, CZ | Rust Czech Republic
  • Rust meetup in Braiins offices
• 2025-03-12 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup
• 2025-03-13 | Biel, CH | Rust Bern
  • 2025 Rust Talks Bern #2 @ BFH Biel
• 2025-03-14 | Paris, FR | Rust in Paris
  • Rust in Paris 2025
• 2025-03-18 | Basel, CH | Rust Basel
  • Rust Meetup #10 @ MDPI Basel
• 2025-03-18 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Topic TBD
• 2025-03-20 | Edinburgh, UK | Rust and Friends
  • March Talks! (Two)
• 2025-03-20 | Prague, CZ | Rust Prague
  • Rust/C++ Meetup Prague (March 2025)
• 2025-03-25 | Aarhus, DK | Rust Aarhus
  • Hack Night - Robot Edition
• 2025-03-25 | Eindhoven, NL | RustNL
  • Rust x Julia Meetup Eindhoven
• 2025-03-26 | Warsaw, PL | Rustikon
  • Rustikon
• 2025-03-27 | Augsburg, DE | Rust Meetup Augsburg
  • Rust Meetup #12: Testing in Rust
• 2025-04-02 | München, DE | Rust Munich
  • Rust Munich 2025 / 1 - hybrid
• 2025-04-02 | Oxford, UK | Oxford Rust Meetup Group
  • Oxford Rust and C++ social

North America

• 2025-03-06 | Montréal, QC, CA | Rust Montréal
  • March Monthly Social
• 2025-03-06 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-03-06 | Saint Louis, MO, US | STL Rust
  • CRDTs in Rust
• 2025-03-10 | Boston, MA, US | Boston Rust Meetup
  • Davis Square Rust Lunch, Mar 10
• 2025-03-13 | Chicago, IL, US | Chicago Rust Meetup
  • Rust Happy Hour
• 2025-03-18 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2025-03-18 | Spokane, WA, US | Spokane Rust
  • Monthly Meetup: Intro to Rust and Python; Using Rustup, Cargo, and Rust!
• 2025-03-20 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2025-03-20 | Redmond, WA, US | Seattle Rust User Group
  • March, 2025 SRUG (Seattle Rust User Group) Meetup
• 2025-03-21 | México City, MX | Rust MX
  • Rust y AWS Lambda. Preparando el camino para desplegar ML/AI
• 2025-03-26 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2025-03-27 | Atlanta, GA, US | Rust Atlanta
  • We're going again!
• 2025-03-31 | Boulder, CO, US | Solid State Depot
  • Boulder Rust: Bryan presents Rusted Hardware

Oceania

• 2025-03-11 | Christchurch, NZ | Christchurch Rust Meetup Group
  • Christchurch Rust Meetup

South America

• 2025-03-15 | São Paulo, BR | Rust São Paulo Meetup
  • Encontro do Rust-SP na CloudWalk

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

The performance impact of moving to Rust – and this is a common theme across everything done when we've moved from C/C++ to Rust – we saw a 5 to 15% performance Improvement.

I'll say that one of the ways that you could attack that kind of stat is say well you rewrote it so whenever you rewrite something you're going to improve it and if you'd rewritten it in C or C++ you would have also seen an improvement like that but the fact is we did not intend to get a performance Improvement. This was purely a porting exercise and we saw this now.

And the other aspect of this is that we never see performance regressions either when we're doing our ports [...]

– Mark Russinovich at RustNationUK '25'

Despite lacking suggestions, llogiq is quite pleased with his choice.

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