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

• Infrastructure Team 2026 Q1 Recap and Q2 Plan

Project/Tooling Updates

• pquantum.dev: Post-Quantum Cryptography in Rust
• haproxy-spoe-rs: A Rust SPOA Agent Library for HAProxy
• Fresh 0.2.23: Terminal IDE adds Windows-1251 encoding, customizable status bar, and faster file finder
• KAIO v0.2.0: Writing GPU Kernels in Rust at 92.5% of cuBLAS
• RustNet: A Real-Time Network Traffic Analysis TUI
• AimDB: The Next Era of Software Architecture Is Data-First
• tailscale-rs v0.2.0: our new Rust library preview
• Sinbo: a CLI snippet manager, store code snippets locally with fuzzy search, encryption, and shell completions
• flodl v0.4.0: heterogeneous multi-GPU DDP with faster training and better convergence than solo GPU

Observations/Thoughts

• The acyclic e-graph: Cranelift's mid-end optimizer
• Rust should have stable tail calls
• Flat Error Codes Are Not Enough
• No one owes you supply-chain security
• Everything Should Be Typed: Scalar Types Are Not Enough
• Borrow-checking surprises
• A Roadmap for Building an Extended Standard Library for Rust
• Okay, what ACTUALLY uses Rust?
• [audio] Netstack.FM episode 34 — Tokio with Carl Lerche (Ep 5 Remastered)

Rust Walkthroughs

• Untangling Tokio and Rayon in production: From 2s latency spikes to 94ms flat
• Understanding Traceroute
• Bringing Rust to the Pixel Baseband
• Fixing DNS tail latency with a 5-line config and a 50-line function
• Debloat your async Rust
• Learn Rust Ownership and Borrowing By Building Mini Grep
• Profiling Rust: A Flamegraph vs PGO, BOLT, and Native CPU Targeting
• Bulletproof Rust Web: An opinionated guide to production-grade Axum applications
• A minimal VMM in Rust with KVM
• claudectl: Building a TUI Dashboard for AI Coding Agents in Rust
• [video] Build with Naz : Eliminate busy waiting with Rust Condvar

Crate of the Week

This week's crate is Myth Engine, a high-performance, cross-platform rendering engine.

Thanks to Pan Xinmiao 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.

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.

• 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

519 pull requests were merged in the last week

Compiler

• add #![unstable_removed(..)] attribute to track removed features
• add suggestion to .to_owned() used on Cow when borrowing
• avoid stack overflow in FindExprBySpan
• enable #[diagnostic::on_const] for local impls
• introduce a #[diagnostic::on_unknown] attribute
• reduce size of ImportData
• ty::Alias refactor
• semantic checks of impl restrictions
• stabilize s390x vector registers
• store chunk_domain_size explicitly in Chunk

Library

• add const Default impls for LazyCell and LazyLock
• constify some Iterator methods
• constify DoubleEndedIterator
• constify Step for NonZero<u*>
• don't leak internal temporaries from dbg!
• explicitly forget the zero remaining elements in vec::IntoIter::fold()
• impl const Residual for ControlFlow
• initial functions to start on transmute v2
• introduce #[diagnostic::on_move] on Rc
• make Box/Rc/Arc::into_array allocator-aware (and add doctest)
• stabilize feature int_lowest_highest_one
• stabilize feature isolate_most_least_significant_one
• stabilize feature uint_bit_width

Cargo

• clean: add target directory validation
• manifest: allow git dependency alongside alternate registry
• auth: add auth scheme hint to token rejected error for alt registries
• core: use closest_msg to suggest similar member name for mistyped -p
• lints: ignore unused_crate_dependencies status
• toml: force script edition warnings on quiet
• copy cargo clean target-dir validation tests to clean_new_layout.rs
• never include use extra-filename in build scripts
• support target.'cfg(..)'.rustdocflags analogously to rustflags

Rustdoc

• fix pattern types rendering
• dep-info for standalone markdown inputs
• inherit inline attributes for declarative macros

Clippy

• fn_to_numeric_cast_any: do not warn cast to raw pointer
• even more fixes for handling of macros
• extend manual_filter to cover and_then
• fix unused_async false positive for stubs with args
• fix wrong suggestion for println_empty_string with non-parenthesis delimiters
• truncate constants to target type in comparison

Rust-Analyzer

• changes to build scripts and config.toml should always refresh
• demoting completion relevance when an inherent impl already exists
• enhance runnable command placeholders
• support impl and mut restrictions
• fix [env] in .cargo/config.toml overriding process environment variables
• fix rustfmt relative custom command
• MIR evaluation of sized &T with recursive const fn
• check coercion, not unification, in "Fill struct fields", as the criteria to use an existing local as the field's value
• complete variants of hidden enums through public aliases
• consider the context of the path for ImportAssets
• diagnose cfged-out crate
• disable the fix for missing-fields when the fields are private
• enable vscode suggest in strings
• fix ref_match position when keyword prefix
• improve add some on block like expression
• improve label on add_missing_match_arms assist
• no complete term expressions on qualified path
• no deref index-expr for extract_function
• no imports on type anchor qualified path
• parse cfg_attr and cfg specially
• handle token mutability in edit flow as well
• migrate extract struct from enum variant to new SyntaxEditor and Port whitespace heuristics to SyntaxEditor
• replace make from generate single field struct from with SyntaxFactory
• unwrap unnecessary result return type in view_crate_graph

Rust Compiler Performance Triage

This week was negative, mainly caused by a type system fix and because we had to temporarily revert some attribute cleanups that previously improved performance.

Triage done by @panstromek. Revision range: e73c56ab..dab8d9d1

Summary :

(instructions:u)	mean	range	count
Regressions ❌
(primary)	0.4%	[0.2%, 0.7%]	46
Regressions ❌
(secondary)	0.5%	[0.1%, 2.3%]	102
Improvements ✅
(primary)	-0.5%	[-0.6%, -0.4%]	4
Improvements ✅
(secondary)	-0.4%	[-0.6%, -0.2%]	5
All ❌✅ (primary)	0.4%	[-0.6%, 0.7%]	50

4 Regressions, 1 Improvement, 5 Mixed; 6 of them in rollups 41 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

• Verify that penultimate segment of enum variant path refers to enum if it has args
• deprecate std::char constants and functions
• impl Default for RepeatN
• Make std::fs::File Send on UEFI

Cargo

• feat(config): Stabilize resolver.lockfile-path config

Compiler Team (MCPs only)

• 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

Rust RFCs

• Propose the Rust Foundation Maintainer fund

Leadership Council

• Fund the Content team (2026 allocation)

No Items entered Final Comment Period this week for 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

• No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2026-04-15 - 2026-05-13 🦀

Virtual

• 2026-04-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Nushell
• 2026-04-15 | Virtual (Girona, ES) | Rust Girona
  • Weekly coding session
• 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
• 2026-04-24 | Virtual (Nairobi, KE) | RustaceansKenya
  • Transitioning To Rust: The Learning Curve
• 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
• 2026-05-01 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Hacker's Hike 0x1
• 2026-05-02 | Virtual (Kampala, UG) | Rust Circle Meetup
  • Rust Circle Meetup
• 2026-05-03 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: First Sunday
• 2026-05-06 | Virtual (Girona, ES) | Rust Girona
  • Weekly coding session
• 2026-05-06 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-05-07 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-05-07 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-05-12 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-05-12 | Virtual (London, GB) | Women in Rust
  • 👋 Community Catch Up
• 2026-05-13 | Virtual (Girona, ES) | Rust Girona
  • Weekly coding session

Asia

• 2026-04-17 | Bangalore, IN | Rust India
  • Rust India Workshop
• 2026-04-18 | Bangalore, IN | Rust India
  • Rust India Conference
• 2026-05-13 | Malaysia, MY | Rust Meetup Malaysia
  • Rust Meetup Malaysia

Europe

• 2026-04-16 | Berlin, DE | Rust Berlin
  • Rust Berlin on location 🏳️‍🌈 - Edition 013
• 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
• 2026-04-24 - 2026-04-26 | Augsburg, DE | Rust Meetup Augsburg
  • Future Week Augsburg: Road to Game Jam – Spielend Bevy und Rust lernen bei Tuxedo Computers
• 2026-04-25 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #26
• 2026-04-29 | Paris, FR | Paris Rustaceans
  • Rust Meetup in Paris
• 2026-04-30 | Manchester, GB | Rust Manchester
  • Rust Manchester April Talk
• 2026-05-02 | Augsburg, DE | Rust Munich and Rust Augsburg
  • Augsburger Linux-Infotag 2026: Gemeinschaftsstand Rust Augsburg und Rust München
• 2026-05-04 | Amsterdam, NH, NL | Rust Developers Amsterdam Group
  • Rust Meetup @ JetBrains
• 2026-05-04 | Frankfurt, DE | Rust Rhein-Main
  • Writing a stock portfolio simulation in Rust with Leptos
• 2026-05-05 | Olomouc, CZ | Rust Moravia
  • 1. Rust Moravia Meetup (Ukaž testy!)

North America

• 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
• 2026-04-16 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-04-16 | Nashville, TN, US | Music City Rust Developers
  • Community 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
• 2026-04-22 | New York, NY, US | Rust NYC
  • Rust NYC: Formally Verified Rust & SAT Solvers
• 2026-04-22 | Portland, OR | Apache DataFusion Meetup
  • Portland Apache DataFusion Meetup
• 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
• 2026-04-28 | New York, NY, US | Rust NYC
  • Rust NYC x OpenAI: Safer 'unsafe' & Barnum: The agentic workflow engine.
• 2026-04-30 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-05-07 | Saint Louis, MO, US | STL Rust
  • Open Project Night

South America

• 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

the amount of times that I spend 15 min in the docs + coding which end up in a monstrous or().flatten().map().is_ok_and() only to get slapped by clippy saying replace your monster with this single function please is way too high 😀

– Teufelchen on RIOT off-topic matrix chat

Thanks to chrysn 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 by The Rust Foundation

Discuss on r/rust