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

• Rust participates in Google Summer of Code 2026
• Rust debugging survey 2026

Foundation

• Guest Blog: FOSDEM 2026 — Rust Devroom in Review

Project/Tooling Updates

• Zed: Split Diffs are Here
• CHERIoT Rust: Status update #0
• SeaORM now supports Arrow & Parquet
• Releasing bincode-next v3.0.0-rc.1
• Introducing Almonds
• SafePilot v0.1: self-hosted AI assistant
• Hitbox 0.2.0: declarative cache orchestration

Observations/Thoughts

• What it means that Ubuntu is using Rust
• Read Locks Are Not Your Friends
• Achieving Zero Bugs: Rust, Specs, and AI Coding
• video] [device-envoy: Making Embedded Fun with Rust—by Carl Kadie

Rust Walkthroughs

• About memory pressure, lock contention, and Data-oriented Design
• Breaking SHA-2: length extension attacks in practice with Rust
• device-envoy: Making Embedded Fun with Rust, Embassy, and Composable Device Abstractions

Research

• Auditing Rust Crates Effectively

Miscellaneous

• Hieratic Prompt Compression: From Prototype to Production

Crate of the Week

This week's crate is docstr, a macro crate providing a macro to create multiline strings out of doc comments.

Thanks to Nik Revenco 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 byRust, 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.

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 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.

• Rust India Conference 2026 | CFP open until 2026-03-14 | Bangalore, IN | 2026-04-18
• Oxidize Conference | CFP open until 2026-03-23 | Berlin, Germany | 2026-09-14 - 2026-09-16
• 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

450 pull requests were merged in the last week

Compiler

• bring back enum DepKind
• simplify the canonical enum clone branches to a copy statement
• stabilize if let guards (feature(if_let_guard))

Library

• add try_shrink_to and try_shrink_to_fit to Vec
• fixed ByteStr not padding within its Display trait when no specific alignment is mentioned
• reflection TypeId::trait_info_of
• reflection TypeKind::FnPtr
• just pass Layout directly to box_new_uninit
• stabilize cfg_select!

Cargo

• cli: Remove --lockfile-path
• job_queue: Handle Clippy CLI arguments in fix message
• fix parallel locking when -Zfine-grain-locking is enabled

Clippy

• add unnecessary_trailing_comma lint
• add new disallowed_fields lint
• clone_on_ref_ptr: don't add a & to the receiver if it's a reference
• needless_maybe_sized: don't lint in proc-macro-generated code
• str_to_string: false positive non-str types
• useless_conversion: also fire inside compiler desugarings
• add allow-unwrap-types configuration for unwrap_used and expect_used
• add brackets around unsafe or labeled block used in else
• allow deprecated(since = "CURRENT_RUSTC_VERSION")
• do not suggest removing reborrow of a captured upvar
• enhance collapsible_match to cover if-elses
• enhance manual_is_variant_and to cover filter chaining is_some
• fix explicit_counter_loop false negative when loop counter starts at non-zero
• fix join_absolute_paths to work correctly depending on the platform
• fix redundant_iter_cloned false positive with move closures and coroutines
• fix unnecessary_min_or_max for usize
• fix panic/assert message detection in edition 2015/2018
• handle Result<T, !> and ControlFlow<!, T> as T wrt #[must_use]
• make unchecked_time_subtraction to better handle Duration literals
• make unnecessary_fold commutative
• the path from a type to itself is Self

Rust-Analyzer

• add partial selection for generate_getter_or_setter
• offer block let fallback postfix complete
• offer on is_some_and for replace_is_method_with_if_let_method
• fix some TryEnum reference assists
• add handling for cycles in sizedness_constraint_for_ty()
• better import placement + merging
• complete .let on block tail prefix expression
• complete derive helpers on empty nameref
• correctly parenthesize inverted condition in convert_if_to_bool_…
• exclude macro refs in tests when excludeTests is enabled
• fix another case where we forgot to put the type param for PartialOrd and PartialEq in builtin derives
• fix predicates of builtin derive traits with two parameters defaulting to Self
• generate method assist uses enclosing impl block instead of first found
• no complete suggest param in complex pattern
• offer toggle_macro_delimiter in nested macro
• prevent qualifying parameter names in add_missing_impl_members
• implement Span::SpanSouce for proc-macro-srv

Rust Compiler Performance Triage

Overall, a bit more noise than usual this week, but mostly a slight improvement with several low-level optimizations at MIR and LLVM IR building landing. Also less commits landing than usual, mostly due to GitHub CI issues during the week.

Triage done by @simulacrum. Revision range: 3c9faa0d..eeb94be7

3 Regressions, 4 Improvements, 4 Mixed; 3 of them in rollups 24 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

• Gate #![reexport_test_harness_main] properly
• Observe close(2) errors for std::fs::{copy, write}
• warn on empty precision
• refactor 'valid for read/write' definition: exclude null

Compiler Team (MCPs only)

• Remove -Csoft-float
• Place-less cg_ssa intrinsics
• Optimize repr(Rust) enums by omitting tags in more cases involving uninhabited variants.
• Proposal for a dedicated test suite for the parallel frontend
• Promote tier 3 riscv32 ESP-IDF targets to tier 2
• Proposal for Adapt Stack Protector for Rust

Cargo

• feat(help): display manpage for nested commands

No Items entered Final Comment Period this week forRust RFCs, Language Reference, Language Team, 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

• Cargo: hints.min-opt-level
• Cargo RFC for min publish age
• Place traits
• RFC: Extend manifest dependencies with used

Upcoming Events

Rusty Events between 2026-02-25 - 2026-03-25 🦀

Virtual

• 2026-02-25 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Getting Started with Rust Part 3: Patterns and Matching
• 2026-02-25 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-02-26 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-03-04 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-03-05 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Presentation: Tock OS Part #3 - Capsules and lower-level hardware drivers
• 2026-03-05 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-03-07 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2026-03-10 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-03-10 | Virtual (London, UK)| Women in Rust
  • 👋 Community Catch Up
• 2026-03-11 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-03-12 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-03-17 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-03-18 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-03-18 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Embedded Rust
• 2026-03-19 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • March, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-03-20 | Virtual | Packt Publishing Limited
  • Rust Adoption, Safety, and Cloud with Francesco Ciulla
• 2026-03-24 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2026-03-24 | Virtual (London, UK) | Women in Rust
  • Lunch & Learn: Crates, Tips & Tricks Lightning Talks - Bring your ideas!
• 2026-03-25 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session

Asia

• 2026-03-22 | Tel Aviv-yafo, IL | Rust 🦀 TLV
  • In person Rust March 2026 at AWS in Tel Aviv

Europe

• 2026-02-25 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #65 Sponsored by Factbird
• 2026-02-26 | Prague, CZ | Rust Czech Republic
  • Informační teorie vs. filtry: Proč filtrování bitcoinového mempoolu NEFUNGUJE
• 2026-02-28 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #24 - crablings edition
• 2026-03-04 | Barcelona, ES | BcnRust
  • Rust at MWC Talent Arena — Workshops + Community Meetup
• 2026-03-04 | Hamburg, DE | Rust Meetup Hamburg
  • Rust Hack & Learn March 2026
• 2026-03-04 | Oxford, UK | Oxford ACCU/Rust Meetup.
  • Records, Shredded on Ice: A Primer on Parquet and Iceberg
• 2026-03-05 | Oslo, NO | Rust Oslo
  • Rust Hack'n'Learn at Kampen Bistro
• 2026-03-11 | Amsterdam, NL | Rust Developers Amsterdam Group
  • Meetup @ Instruqt
• 2026-03-12 | Geneva, CH | Post Tenebras Lab
  • Rust Meetup Geneva
• 2026-03-18 | Dortmund, DE | Rust Dortmund
  • Rust Dortmund Meetup - Intro to Embedded Rust - March
• 2026-03-19 - 2026-03-20 | | Rustikon
  • Rustikon Conference
• 2026-03-24 | Aarhus, DK | Rust Aarhus
  • Hack Night - Advent of Code

North America

• 2026-02-25 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-02-25 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA: Rust as a Glue Layer- Infrastructure for AI-Native Applications
• 2026-02-26 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-02-26 | New York, NY, US | Rust NYC
  • Rust NYC: Compile-Time Solutions
• 2026-02-28 | Boston, MA, US | Boston Rust Meetup
  • Boston University Rust Lunch, Feb 28
• 2026-03-05 | Saint Louis, MO, US | STL Rust
  • TBD
• 2026-03-07 | Boston, MA, US | Boston Rust Meetup
  • MIT Rust Lunch, Mar 7
• 2026-03-14 | Boston, MA, US | Boston Rust Meetup
  • North End Rust Lunch, Mar 14
• 2026-03-17 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-03-19 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • March, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-03-21 | Boston, MA, US | Boston Rust Meetup
  • Porter Square Rust Lunch, Mar 21
• 2026-03-25 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground

Oceania

• 2026-03-26 | Melbourne, VIC, AU | Rust Melbourne
  • TBD March 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

This is actually just Rust adding support for C++-style duck-typed templates, and the long and mostly-irrelevant information contained in the ICE message is part of the experience.

– robofinch on rust-users

Thanks to Kyllingene 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 byThe Rust Foundation

Discuss on r/rust