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:

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
  • 5. 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

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

• docs.rs: building fewer targets by default
• Changes to WebAssembly targets and handling undefined symbols
• Leadership Council update — March 2026

Foundation

• What’s Next for the Rust Innovation Lab?
• Rust Foundation Interop Initiative Update: From Research to Implementation

Newsletters

• This Month in Rust OSDev: March 2026

Project/Tooling Updates

• Surelock
• Rust for CPython Progress Update April 2026
• RustRover 2026.1: Professional Testing With Native cargo-nextest Integration
• Toasty, an async ORM for Rust, is now on crates.io
• slopc: The cursed macro Rust maintainers never anticipated
• Processing 1M Chess Games in 15 Seconds with Rust
• Dumap v1.1: Cross-platform disk usage treemap visualization
• Proxelar 0.4.0: Intercept & Modify Traffic
• amoxide: composable, context-aware shell aliases
• Ply 1.1: Building Polished UIs in Rust
• Myth Engine: A compiler-style RenderGraph for cross-platform rendering
• selinux-explain

Observations/Thoughts

• Callgraph analysis
• Fixing our own problems in the Rust compiler
• 800 Rust terminal projects in 3 years
• What We Learned Building a Rust Runtime for TypeScript
• Supply chain nightmare: How Rust will be attacked and what we can do to mitigate the inevitable
• Building an SSA-Based Declarative Render Graph in Rust
• [audio] Protocol Shorts: TLS Encrypted Client Hello

Rust Walkthroughs

• Learn Rust Basics By Building a Brainfuck Interpreter
• How uv Works Under the Hood
• Building Postgres compatibility in Rust: pgwire and DataFusion
• [video] impl Rust: WAV noise generator

Miscellaneous

• [video] Rust/C++ Interop Challenges - Victor Ciura - CppCon 2025

Crate of the Week

This week's crate is aimdb-core, a type-safe and platform-agnostic data pipeline where the Rust type system is the schema and trait implementations define its behavior.

Thanks to sounds.like.lx 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.

• Wild Almonds — Shared Audio Player library for flutter and Tauri

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 2026-04-14 | Kongsberg, Norway | 2026-09-09 - 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

479 pull requests were merged in the last week

Compiler

• compute the result of a projection type with region errors
• make layout_of cycles fatal errors
• properly generalize unevaluated consts

Library

• add integer truncation and extension methods
• debugger visualizers: optimize lookup behavior
• impl Step for NonZero<u*>
• introduce #[diagnostic::on_move] on Arc
• make substr_range and subslice_range return the new Range type
• more informative Debug for vec::ExtractIf
• stabilize new Range type and iterator

Cargo

• lints: Emit unused_dependencies lint
• compile: Don't hide hard warnings with build.warnings=allow
• compile: build.warnings=allow should not hide denied diagnostics
• install: Ignore resolver.lockfile-path
• add frame-pointers profile option
• set CARGO env var during rustc -vV probe
• send Content-Type header with cargo publish requests
• simplified build script bin names in new layout
• split out cargo-util-terminal
• warn on invalid jobserver file descriptors

Clippy

• unsafe_removed_from_name: skip linting when renaming to '_'
• unnecessary type cast causing a compile error
• multiple fixes to false negatives of question_mark
• perf: disable nonminimal_bool by default
• rework expr_use_ctxt into an iterator over successive use sites
• unneeded wildcard improvement

Rust-Analyzer

• add support for folding ranges for chained expressions
• implement thin-arrow completion in fn return position
• offer on tail-expr with else-branch for if_let_to_guarded assist
• support labeled block for convert_to_guarded_return
• support macro expansion in #[doc = ...] attributes
• fix extract function invalid self param
• add semicolon for postfix format unit like snippets
• fix a cycle in bounds lowering
• fix extract variable on arg with comma
• fix indent for convert_let_else_to_match
• fix param inlayHints on empty expr and comma
• fix stale diagnostics when a custom check command is configured
• fix SyntaxEditor upmapping of nodes with mapped ancestor that aren't mapped themselves
• improve inserted order for trait_impl_redundant_assoc_item
• load rust-analyzer.toml for virtual workspaces
• not suggest name in nested type in variant
• offer 'type_mismatch' some fixes inside macro
• offer on empty else block for 'convert_let_else_to_match'
• report expected type, found { in parser
• silence type mismatch diagnostic when type is unknown
• support cfg-ing array elements
• support filesystems that don't send Create events
• support multiple snippet placeholders in VS Code extension
• unconditionally pass --include-ignored for test runnables
• use the correct project root when there are multiple workspaces
• wrap parentheses on guard for replace_if_let_with_match
• impl Display type hint inlay hints at the end of the line
• implement feature(more_qualified_paths)
• make matching brace work when cursor not at bracket
• move mutability responsibility from caller to edit_algo
• move syntax editor initialization invariants to its constructor
• publish no-server to Code Marketplace and OpenVSX
• replace add trait assoc items to impl with its factory variant

Rust Compiler Performance Triage

A shorter week than normal (probably due to later perf triage last week). Overall fairly small changes scattered across various PRs, though the net effect was slightly positive (-0.5% avg change). All changed ended up either mixed or improvements this week.

Triage done by @simulacrum. Revision range: cf7da0b7..e73c56ab

0 Regressions, 3 Improvements, 8 Mixed; 5 of them in rollups 26 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

• report the varargs_without_pattern lint in deps
• Partially stabilize LoongArch target features
• Never break between empty parens

Cargo

• No Cargo Tracking Issues or PRs entered Final Comment Period this week.

Compiler Team (MCPs only)

• cargo clean: Add target directory validation

No Items entered Final Comment Period this week for Rust 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

• Propose the concept of a crates.io username for identity
• RFC: Inheriting of default-features in Cargo
• Add Bitbucket Cloud OAuth login for crates.io
• MIR move elimination

Upcoming Events

Rusty Events between 2026-04-08 - 2026-05-06 🦀

Virtual

• 2026-04-09 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 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
• 2026-04-14 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
  • Web development using axum in Rust - part 3
• 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
• 2026-04-28 | 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 (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing

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

• 2026-04-08 | 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
• 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
• 2026-05-02 | Augsburg, DE | Rust Munich and Rust Augsburg
  • Augsburger Linux-Infotag 2026: Gemeinschaftsstand Rust Augsburg und Rust München
• 2026-05-04 | Frankfurt, DE | Rust Rhein-Main
  • Writing a stock portfolio simulation in Rust with Leptos

North America

• 2026-04-09 | Chicago, IL, US | Chicago Rust Meetup
  • Rust Happy Hour
• 2026-04-09 | Lehi, UT, US | Utah Rust
  • Utah Rust April Meetup
• 2026-04-09 | Montréal, QC, CA | Rust Montréal
  • April Monthly Social
• 2026-04-09 | Portland, OR, US | PDXRust
  • Hexadecimal Floating Point? Why? How?
• 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
• 2026-04-16 | 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
• 2026-04-23 | 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
• 2026-04-30 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl

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

Rust tried to have polymorphic generics in the early pre-1.0 days, and they quite reasonably gave up because it was too much work. For real Swift, great fucking working for getting all of this to work!

– Aria Desires on her blog

llogiq thanks himself 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

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

• 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:

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

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

• What we heard about Rust's challenges
• Security advisory for Cargo

Foundation

• Canonical Joins the Rust Foundation as a Gold Member

Newsletters

• Scientific Computing in Rust #16 (March 2026)

Project/Tooling Updates

• Ferox - A native PostgreSQL client in Rust
• Introducing dial9: A flight recorder for Tokio
• Zellij 0.44: native Windows support, new Rust APIs, remote sessions
• vigil-rs: A Rust Service Supervisor for Containers with PID 1 handling
• Fyrox 1.0.0
• Edge.js: running Node.js safely in a WebAssembly sandbox with Wasmer and WASIX
• Bookokrat v0.3.8: A terminal EPUB / PDF Book Reader now supports DJVU
• flodl v0.1.5: benchmarking Rust vs PyTorch on 7 models — up to 30% faster with 3-20x tighter variance
• Zero-copy Protobuf and ConnectRPC for Rust
• mtp-rs: pure-Rust MTP library, up to 4x faster than libmtp
• [video] Batty: Supervised Agent Execution for Software Teams — Demo
• indxr v0.2.0: A fast codebase indexer and MCP server for AI coding agents
• halloy 2026.5 - desktop IRC client with IRCv3 capabilities

Observations/Thoughts

• Deadlocking a Tokio Mutex without Holding a Lock
• The Good, the Bad, and the Leaky: jemalloc, bumpalo, and mimalloc in meilisearch
• Maximally minimal view types
• Matching Puzzle Pieces and Disappointing Benchmarks
• What If Traits Carried Values
• An effect notation based on with-clauses and blocks
• Rust threads on the GPU
• Elaborating Rust Traits to Dictionary-Passing Style

Rust Walkthroughs

• ZK snarks for rust developer part 2/8
• Let's see Paul Allen's SIMD CSV parser
• Building an LSP Server with Rust is surprisingly easy and fun
• An Incoherent Rust
• Building pentest devices with Rust and ESP32 microcontrollers
• Rust in Intersec's lib-common, Part 1: Integrating Rust in a C Build System

Crate of the Week

This week's crate is noq, a general purpose implementation of the QUIC transport protocol in pure rust.

Thanks to Brendan O'Brien 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.

• Wild Almonds — Appimage fails to start
• Wild Almonds — implement workspace for user_preference

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
• NDC Techtown 2026 | CFP open until 2026-05-03 | Kongsberg, Norway | 2026-09-21 - 2026-09-24

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

433 pull requests were merged in the last week

Compiler

• fix some suggestions of the for-loops-over-fallibles lint
• guard patterns: lowering to THIR
• introduce #[diagnostic::on_move(message)]
• make par_slice consistent with single-threaded execution
• privacy: fix type privacy holes in RPITITs

Library

• add APIs for dealing with titlecase
• add is_disconnected functions to mpsc and mpmc channels
• implement BinaryHeap::as_mut_slice
• make OsString::truncate a no-op when len > current_len
• optimize 128-bit integer formatting
• optimize BTreeMap::append() using CursorMut
• vec::Drain::fill: avoid reference to uninitialized memory
• unstable impl of From<{i64, u64}> for f128

Cargo

• clean: Validate that target_dir is not a file
• cli: Add support for completing --config argument values with native-completions
• cli: complete --config and --color before command
• compile: Make build.warnings ignore non-local deps
• fix symlink_and_directory when running in a long target dir name
• detect circular publish dependency cycle in workspace publish
• fix fetching non-standard git refspecs on non-github repos
• warn when installing with a non-default toolchain

Clippy

• add BinaryHeap::pop_if() to manual_pop_if
• fix collapsible_match false positive when the pat binding is moved or mutated
• perf: manual_is_ascii_check, remove 822 million instructions

Rust-Analyzer

• add ops::AddAssign implement for IndentLevel
• add applicable on LetExpr for unwrap_tuple
• add applicable on let-else branch for unwrap_block
• add auto trait name for generate_trait_from_impl
• add fixes for non_exhaustive_let diagnostic
• add mapping to syntax factory constructor methods
• add nested lifetime support for add_lifetime_to_type
• add partial selection for merge_imports
• add wrap multiple attr for wrap_unwrap_cfg_attr
• change test_name placeholder to executable_arg
• complete block .let in closure expression
• offer 'add_braces' on bin-expr assignment
• offer on let-expr for inline_local_variable
• fix asm sym operand parsing for parenthesized expr fragments
• fix indent for convert_closure_to_fn
• fix indent for trait_impl_redundant_assoc_item
• fix not applicable on empty struct for no_such_field
• fix other predicate for replace_is_method_with_if_let_method
• fix postfix completion indentation compensation
• fix tuple struct pat expected type
• add ident_pat qualifier to fully fn param
• don't add a second semicolon after postfix completions
• fill match arms on last comma and empty expr
• fix overlap edit on record to tuple assist uses self
• incorrect flychecks with multiple workspaces
• offer on const like path-expr for 'extract_variable'
• replace TODO placeholders in next-solver IrPrint with proper formatting
• implement signature type inference
• improve tmp iterator variable name for convert_for_to_while_let
• migrate convert_from_to_tryfrom assist to SyntaxEditor API
• project json compatibility improvements
• project json compatibility improvements
• remove doc comments for generate_trait_from_impl
• remove outdated TODO
• remove the mapping for expr_underscore from the syntax factory constructor
• replace direct usage of make with syntax factory and migrate assist to syntaxEditor
• support WhileExpr and ForExpr for add_label_to_loop
• support more runnable kinds in project JSON

Rust Compiler Performance Triage

Lot of mixed results this week. One big regression from #152931 makes the results look pretty negative, but otherwise the week was fairly quiet.

Triage done by @panstromek. Revision range: 5b61449e..6f22f613

Summary:

1 Regression, 1 Improvement, 4 Mixed; 1 of them in rollups 32 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:

• RFC: map_or_default in Option and Result

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 fN::BITS
• Fallback {float} to f32 when f32: From<{float}> and add impl From<f16> for f32
• Tracking Issue for tcp_deferaccept
• Tracking Issue for #138068: Add Result::map_or_default and Option::map_or_default
• Merge fabsf16/32/64/128 into fabs::<F>
• 1.95 beta regression: "malformed feature attribute input"
• Never break between empty parens

Cargo

• feat: add frame-pointers profile option

Compiler Team (MCPs only)

• Emit retags in codegen
• 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

Language Reference

• Guarantee alignment of fixed-width integer primitives

No Items entered Final Comment Period this week for Rust RFCs, 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

• Propose the Rust Foundation Maintainer fund
• Avoid linting unreachable_code on todo!()

Upcoming Events

Rusty Events between 2026-03-25 - 2026-04-22 🦀

Virtual

• 2026-03-25 | Virtual (Girona, ES) | Rust Girona
  • Rust Girona Hack & Learn 03 2026
• 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
• 2026-04-09 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-04-14 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-04-14 | Virtual (London, GB) | Women in Rust
  • 👋 Community Catch Up
• 2026-04-15 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Nushell
• 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

Asia

• 2026-03-28 | Delhi, IN | Rust Delhi
  • Rust Delhi Meetup #13
• 2026-04-17 | Bangalore, IN, Rust India
  • Rust India Workshop
• 2026-04-18 | Bangalore, IN, Rust India
  • Rust India Conference

Europe

• 2026-03-25 | Dresden, DE | Rust Dresden
  • First Meetup
• 2026-03-26 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #66 sponsored by Adapt!
• 2026-03-26 | Paris, FR | Rust Paris
  • Rust meetup #84
• 2026-03-27 | Paris, FR | Rust in Paris
  • Rust in Paris
• 2026-03-28 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #25
• 2026-04-01 | Berlin, DE | Rust Berlin
  • Rust Berlin Talks: The next generation
• 2026-04-01 | Edinburgh, GB | Rust and Friends
  • Rust and Friends (evening pub)
• 2026-04-01 | Oxford, UK | Oxford ACCU/Rust Meetup.
  • Rust/ACCU meetup.
• 2026-04-02 | London, GB | Rust London User Group
  • LDN Talks Spring Community Showcase
• 2026-04-03 | Edinburgh, GB | Rust and Friends
  • Rust and Friends (daytime coffee)
• 2026-04-07 | Basel, CH | Rust Basel
  • Rust Meetup #15 @ letsboot
• 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, SN, DE | Rust - Modern Systems Programming in Leipzig
  • Native GUIs with Rust

North America

• 2026-03-25 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-03-25 | New York, NY, US | Rust NYC
  • Rust NYC's Digital Asset Adoption Special
• 2026-03-26 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-03-28 | Boston, MA, US | Boston Rust Meetup
  • Chinatown Rust Lunch, Mar 28
• 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
• 2026-04-09 | 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
• 2026-04-16 | 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

Oceania

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

South America

• 2026-04-11 | Argentina, 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

Code does not become better out of thin air just because you rewrite it in #rustlang.

– allp on mastodon

Despite a third week gone by without a suggestion, llogiq is unrelenting in his quest to find a quote worth your while.

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

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