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 Rust 1.94.1
• Program management update — February 2026

Foundation

• Rust Foundation Joins Datadog’s Open Source Program

Project/Tooling Updates

• Ntpd-rs: it's about time!
• octopos: OS for risc-v in rust
• Building a guitar trainer with embedded Rust
• blogr v0.5.0 - blog without leaving your terminal
• feedr v0.7.0 - terminal-based RSS/Atom feed reader
• mdterm v2.0.0 - terminal-based Markdown browser
• RustGrep: simple search for 114 Rust blogs
• Rust's next-generation trait solver
• Portable Async Rust
• jsongrep faster than {jq, jmespath, jsonpath-rust, jql}
• SeqPacker: 11 bin-packing algorithms in Rust
• flodl v0.2.2: PyTorch parity in Rust

Observations/Thoughts

• filtra.io | Breaking The AI Infra Monopoly With Rust- Tracel AI
• Rust: Memory safety in kernel space | OSHub
• Fixing our own problems in the Rust compiler
• Bugs that the Rust compiler catches for you: The revolution of compiler-enforced correctness
• I ported the OpenAI Python SDK to Rust in 5 days with Claude Code
• [video] 🦀 Rust (mir) compiler bites: Closures — thou shalt not name this struct
• [video] How C++ Finally Beats Rust at JSON Serialization

Rust Walkthroughs

• Adding WASM Plugins to Your App
• ZK snarks for rust developer part 3/8
• Building a Crash-Safe Email Queue in Rust
• Adding a Scripting Engine to a Rust CLI with Rhai

Crate of the Week

This week's crate is tsastat, a high-resolution Thread State Analysis (TSA) tool for Linux.

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.

No calls for testing were issued this week by Rust, Cargo, 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.

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.

• NDC Techtown | CFP open until 2024-04-14 | Kongsberg, Norway | 2024-09-09 - 2026-09-12.
• EuroRust | CFP open until 2026-04-27 | Barcelona, Spain | 2026-10-14 - 2026-10-17

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

487 pull requests were merged in the last week

Compiler

• add x86_64-unknown-linux-gnu{m,t}san target which enables {M,T}San by default
• add -Zsanitize=kernel-hwaddress

Library

• constify Step trait and all of its implementations
• constify comparisons and Clone for core::mem::Alignment
• constify const Fn*: Destruct
• don't drop arguments' temporaries in dbg!
• don't fuse in MapWindows
• implement unchecked_funnel_{shl,shr}
• reimplement hash_map! macro
• make PinCoerceUnsized require Deref
• stabilize new RangeFrom type and iterator
• trim_prefix for paths

Cargo

• resolver: better match rustc in error styling
• build: cover more behavior of build.warnings
• build: make it easier to review build.warnings behavior

Rustdoc

• rustdoc rejects html emits with json output

Rustfmt

• prevent panic when rewritng associated item delegations

Clippy

• add manual_option_zip lint (a.and_then(|x| b.map(|y| (x, y))))
• impl manual_noop_waker lint
• explicit_counter_loop: suggest .take(n) for for _ in 0..n co…
• iter_kv_map: handle identity map for map and flat_map
• manual_pop_if: lint more cases, even if we do not provide a suggestion
• fix collapsible_if false positive when the inner if contains cfg
• preserve parentheses in suggestion in presence of cascaded casts
• perf: reduce matching_root_macro_call usage (23b → 22.24b)

Rust-Analyzer

• fix not applicable on ambiguous ident pat for merge_match_arms
• complete envs in nested env!()
• correct type_or_const param index bound in debug_assert
• correct missing-args messages for sched_getaffinity and getenv shims
• don't panic unmerge arm on trailing pipe
• fix block lowering in ast id map
• keep comments for 'Fill match arms'
• postfix completions include nots prefix-expr
• skip usages inside macro expansions in destructure struct/tuple binding
• turn back TyLoweringContext.store to self after lowering parent defaults
• wrap Option<> for desugar_try_expr_let_else
• wrap Result<> for desugar_try_expr_let_else
• wrap ty-anchor in non-path type constuctor
• fully implement VariantFields expression support
• hookup Signature Inference in more places
• only allocate item blocks if they actually contain items or statement macros
• remove Arc from GenericParams and AstIdMap
• remove generate trait impl text intransitive from utils

Rust Compiler Performance Triage

We had some infrastructure troubles this week which prevented some rollup PRs from generating their "unrolled" builds, which made rollup regression investigation more complicated, although we were able to locate and revert the largest rollup regressions in the end. #154304 brought some nice improvements by optimizing the query system.

Triage done by @kobzol. Revision range: 6f22f613..cf7da0b7

Summary :

(instructions:u)	mean	range	count
Regressions ❌
(primary)	0.4%	[0.1%, 1.2%]	4
Regressions ❌
(secondary)	0.3%	[0.1%, 0.5%]	12
Improvements ✅
(primary)	-0.8%	[-6.2%, -0.2%]	58
Improvements ✅
(secondary)	-0.4%	[-1.9%, -0.1%]	28
All ❌✅ (primary)	-0.8%	[-6.2%, 1.2%]	62

3 Regressions, 4 Improvements, 2 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:

• Mitigation enforcement
• Add homogeneous_try_blocks

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

• Tracking Issue for isolate_most_least_significant_one
• Tracking Issue for int_lowest_highest_one
• Tracking Issue for uint_bit_width
• Tracking Issue for #138068: Add Result::map_or_default and Option::map_or_default
• Do not use non-wf input expectations from fudge when checking function calls
• Syntactically reject equality predicates
• Tracking Issue for tcp_deferaccept
• stabilize s390x vector registers
• Replacing self overwriting with proper resolution

Rust RFCs

• build-std: always

No Items entered Final Comment Period this week for Cargo, Compiler Team (MCPs only), Language Team, Language Reference, Leadership Council 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

• RFC: Associated traits
• Add be present contribution policy
• initial draft for 2026 project goals

Upcoming Events

Rusty Events between 2026-04-01 - 2026-04-29 🦀

Virtual

• 2026-03-26 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-03-31 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Web development using axum in Rust - part 1
• 2026-04-01 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-04-01 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-04-02 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-04-04 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2026-04-05 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: First Sunday
• 2026-04-07 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Web development using axum in Rust - part 2
• 2026-04-09 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-04-14 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Web development using axum in Rust - part 3
• 2026-04-14 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-04-14 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2026-04-15 | Virtual (Girona, ES) | Rust Girona
  • Weekly coding session
• 2026-04-15 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Nushell
• 2026-04-16 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • April, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-04-19 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: Third Sunday
• 2026-04-21 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-04-22 | Virtual (Girona, ES) | Rust Girona
  • Weekly coding session
• 2026-04-23 | Virtual (Amsterdam, NL) | Bevy Game Development
  • Bevy Meetup #13
• 2026-04-23 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-04-28 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2026-04-28 | Virtual (London, UK) | Women in Rust
  • Lunch & Learn: From Protobuf to Production - A Guide to gRPC in Rust
• 2026-04-29 | Virtual (Girona, ES) | Rust Girona
  • Weekly coding session

Asia

• 2026-04-11 | Bangalore, IN | Rust Bangalore
  • April 2026/Pre-Conference Rustacean meetup
• 2026-04-17 | Bangalore, IN | Rust India
  • Rust India Workshop
• 2026-04-18 | Bangalore, IN | Rust India
  • Rust India Conference

Europe

• 2026-04-01 | Berlin, DE | Rust Berlin
  • Rust Berlin Talks: The next generation
• 2026-04-01 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (evening pub)
• 2026-04-01 | Köln, DE | Rust Cologne
  • Rust in April: From Zero to Rust
• 2026-04-01 | Oxford, UK | Oxford ACCU/Rust Meetup.
  • It came from another dimension!
• 2026-04-02 | London, UK | Rust London User Group
  • LDN Talks Spring Community Showcase
• 2026-04-02 | Toulouse, FR | Rust Toulouse
  • Rust Toulouse Meetup - Release, Servers & Ray Tracing Demystified
• 2026-04-03 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (daytime coffee)
• 2026-04-07 | Basel, CH | Rust Basel
  • Rust Meetup #15 @ letsboot
• 2026-04-07 | Frankfurt, DE | Rust Rhein-Main
  • Building a drone from scratch with Rust (and some hardware)
• 2026-04-08 | Virtual (Girona, ES) | Rust Girona
  • Rust Girona Hack & Learn 04 2026
• 2026-04-09 | Geneva, CH | Rust Meetup Geneva
  • Rust Meetup Geneva
• 2026-04-09 | Oslo, NO | Rust Oslo
  • Rust talks @ AutoStore – "Patterns for Event Driven Systems" and "Rust + WASM"
• 2026-04-21 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Native GUIs with Rust
• 2026-04-23 | Aarhus, DK | Rust Aarhus
  • Talk Night and Birthday Party at MFT Energy

North America

• 2026-04-02 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-04-02 | Saint Louis, MO, US | STL Rust
  • SIUE Cruft Crawler with LLM
• 2026-04-04 | Boston, MA, US | Boston Rust Meetup
  • Winter Hill Rust Lunch, Apr 4
• 2026-04-07 | New York, NY, US | Rust NYC
  • Rust NYC: The Open Source Special
• 2026-04-09 | Chicago, IL, US | Chicago Rust Meetup
  • Rust Happy Hour
• 2026-04-09 | San Diego, CA, US | San Diego Rust
  • San Diego Rust April Meetup - Back in person!
• 2026-04-11 | Boston, MA, US | Boston Rust Meetup
  • Brookline Rust Lunch, Apr 11
• 2026-04-14 | Charlottesville, VA, US | Charlottesville Rust Meetup
  • Sharpening Your Rust Skills for Job Interviews
• 2026-04-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Nushell
• 2026-04-16 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • April, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-04-18 | Boston, MA, US | Boston Rust Meetup
  • Harvard Square Rust Lunch, Apr 18
• 2026-04-20 - 2026-04-22 | Portland, OR | Tokio
  • TokioConf 2026
• 2026-04-21 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-04-22 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-04-23 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA April!
• 2026-04-25 | Boston, MA, US | Boston Rust Meetup
  • South Station Rust Lunch, Apr 25

Oceania

• 2026-04-09 | Brisbane City, QL, AU | Rust Brisbane
  • Rust Brisbane Apr 2026

South America

• 2026-04-11 | Buenos Aires, AR | Oxidar Org
  • Oxidar.org Hackaton - Snakear - ¡Veni a hackear con Rust!
• 2026-04-17 | Rio de Janeiro, BR | Meetups Rust RJ
  • Meetup Rust RJ

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

When you do cursed things, problems find you.

– Folkert de Vries on the trifecta tech blog

We have gone four weeks bare of suggestions for quotes. llogiq is still fine with his choice, but he'd be much more happy if any of you would help him in his search.

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