This Week in Rust 653
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
Newsletters
Scientific Computing in Rust #18 (May 2026)
Project/Tooling Updates
gitoxide - May 26
hyper User Survey 2025 Results
Rust Update: gRPC Welcomes Tonic!
serde-const-default v0.1: Removes boilerplate when using const values as field defaults
BoquilaHUB 0.5: AIs for Nature. Now it includes SOTA AI bioacoustics models and embeddings models
splog: a log viewer TUI with automatic tag categorization
rgx v0.12.3 — Building a regex debugger for the terminal in Rust
UI tests are the guardrails an AI needs: the story of clipboardwire
slintcn 0.22: shadcn/ui-style copy-paste components for Slint native apps
Releasing dtact v0.2.2 and rssn-advanced v0.1.0: the next generation async concurrent engine and scientific computing engine
Observations/Thoughts
Noroboto: Lying Fonts and Mitigation in Rust
Erasing Existentials
libwce: the entropy layer of a wavelet codec, on its own
Tech Notes: Theseus: translating win32 to wasm
Bevy Game Engine Explained Visually
The reflex of deriving serde traits
Physical AI Needs a Typed World Model, Not a Vector DB
Keep calm and use (Rust) monorepos
[audio] Rust for Linux Live with Alice Ryhl and Greg Kroah-Hartman
[audio] Netstack.FM episode 38 — Building and testing network stacks with Rama
[video] Can a QR code be made of stars?
Rust Walkthroughs
Rust Patterns & Engineering How-Tos
Laissez-Faire Errors
Learn Rust HashMap and Iterators by Building a Git Object Store Reader
Learn the Basics of Bevy by Building and Deploying Pong to Itch.io
The Slowdown That Doesn’t Show Up in Profiles
Building an AsyncIO executor for the 3DS
[video] Nine Ways to do Inheritance in Rust, a Language without Inheritance
Miscellaneous
Content-addressed Rust builds (or, what kache actually caches)
Crate of the Week
This week’s crate is inline_tweak, a crate to embed tweakable constants inside your Rust application without full recompilation.
Thanks to Kill The Mule for the 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.
rust cookbook - Expand Command Line section with clap derive, subcommands, and env vars
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.
- No Calls for papers or presentations were submitted this week.
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
352 pull requests were merged in the last week
Compiler
rustc_on_unimplemented: introduce format specifiers
account for proc macro spans in do_not_recommend diagnostics
implement fast path for derive(PartialOrd) when deriving Ord
make bitset would_modify_words more vectorzer-friendly
parse mut restrictions
stop needing materialized places for most intrinsics
Library
add unstable Share trait
stabilize bool_to_result
use strongly typed wrapped indices in VecDeque
Cargo
compiler: forward verbose flag to rustc for local crates
don’t use the network for a publish dry-run test
break out RegistryConfig and crate_url for interpreting RegistryConfig::dl
fix CVE-2026-5222 and CVE-2026-5223
artifact: remove compat mode from artifacts
Rustdoc
stabilize --remap-path-prefix in rustdoc
Clippy
useless_format: fire on wrapped in a block-producing macro
return can be removed from the last stmt of a block if it has an expr
add check for midpoint using multiplication by 0.5 and >> 1
avoid unnecessary String allocations in MinifyingSugg arithmetic ops
extend clippy::missing_safety_doc to unsafe fields
fix manual_range_contains NAN handling
fix error message for useless_borrows_in_formatting for mutable borrows
move unnecessary_get_then_check to complexity
simplify is_some() && …unwrap() to is_some_and in unit_arg
Rust-Analyzer
diagnostics: mut_ref binding feature diagnostic
assists/add_reference_here: _modify_ the reference type when dealing with &T->&mut T
cfg: correct separator index in CfgDiff disable loop
hir-ty: saturate float-to-uint cast in const eval
test-utils: drain inactive_regions by inactive_line_region
add diagnostic for E0033
add diagnostic for E0608
completions imports exclude supports sub items
filter package-scoped features
extract_module missing import for macro calls
add type_match score for struct_pat
allow wildcard params in foreign fn declarations
analysis expected ty in enum variant
autoimport enum variants
do not autoref in method probe in path mode
do not complete semicolon in match-expr place
do not consider the path of the macro in a macro call to be inside a macro call
emit diagnostic for rest array patterns without fixed-length arrays
fix SyntaxContext::roots technically overlapping valid interneds
flip coerce_never type_mismatch tys
have a specific error for unimplemented builtin macros
no suggest ref match when expected generic ref
no use sad pattern on happy arm with guard
normalize expected tuple struct pat field
refactor handling of generic params in hir::Type
support named consts in range pattern types
use grouped annotation for add_label_to_loop
provide better incrementality for modules
Rust Compiler Performance Triage
This week was largely positive, with most of the improvements coming from algorithm change in visibility checking: #156228.
Triage done by @panstromek. Revision range: 281c97c3..783eb8c8
Summary:
(instructions:u) mean range count Regressions ❌ (primary) 0.4% [0.1%, 0.7%] 5 Regressions ❌ (secondary) 0.5% [0.1%, 1.1%] 16 Improvements ✅ (primary) -0.9% [-6.6%, -0.1%] 164 Improvements ✅ (secondary) -0.4% [-1.3%, -0.1%] 51 All ❌✅ (primary) -0.9% [-6.6%, 0.7%] 169
2 Regressions, 2 Improvements, 5 Mixed; 2 of them in rollups 34 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:
Propose the concept of a crates.io username for identity
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
Compiler Team (MCPs only)
Promotes 5 Thumb-mode bare-metal Arm targets to Tier 2
Add -Z dead-fn-elimination to skip codegen of BFS-unreachable functions
Rust
Update transmute_copy to ub_checks and ?Sized
Tracking Issue for NEON dot product intrinsics
Never break between empty parens
Rust RFCs
Avoid linting unreachable_code on todo!()
Unsafe Code Guidelines
What are the values of a union type? (in particular, what is the validity invariant of a union)
No Items entered Final Comment Period this week for Cargo, Language Team, Language Reference or Leadership Council. 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 2026-05-27 - 2026-06-24 🦀
Virtual
2026-05-27 | Virtual (Girona, ES) | Rust Girona
Weekly coding session
2026-06-02 | Virtual | libp2p Events
rust-libp2p Open Maintainers Call
2026-06-02 | Virtual (Tel Aviv-yafo, IL) | Rust 🦀 TLV
שיחה חופשית ווירטואלית על ראסט
2026-06-03 | Virtual (Indianapolis, IN, US) | Indy Rust
Indy.rs - with Social Distancing
2026-06-04 | Virtual (Berlin, DE) | Rust Berlin
Rust Hack and Learn
2026-06-04 | Virtual (Nürnberg, DE) | Rust Nuremberg
Rust Nürnberg online
2026-06-04 | Virtual (Tel Aviv-yafo, IL) | Code Mavens 🦀 - 🐍 - 🐪
Exploring FalkorDB - Learning to use a Graph Database in Rust
2026-06-06 | Virtual (Kampala, UG) | Rust Circle Meetup
Rust Circle Meetup
2026-06-07 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Rust Deep Learning: First Sunday
2026-06-09 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Second Tuesday
2026-06-10 | Virtual (Girona, ES) | Rust Girona
Weekly coding session
2026-06-16 | Virtual (Washington, DC, US) | Rust DC
Mid-month Rustful
2026-06-17 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
Jiff
2026-06-17 | Virtual (Girona, ES) | Rust Girona
Weekly coding session
2026-06-18 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
June, 2026 SRUG (Seattle Rust User Group) Meetup
2026-06-18 | Virtual (Berlin, DE) | Rust Berlin
Rust Hack and Learn
2026-06-21 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Rust Deep Learning: Third Sunday
2026-06-23 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Fourth Tuesday
2026-06-23 | Virtual (London, UK) | Women in Rust
Lunch & Learn: What the heck are monads - and how do we fake them in Rust
Asia
2026-06-02 | Beijing, CN | Voice AI and Rust Meetup (Rust for AI, lowcoderust.com)
AI Agents and Open Source LLM (Call for Speakers)
Europe
2026-05-28 | Copenhagen, DK | Copenhagen Rust Community
Rust meetup #68
2026-05-28 | London, UK | Rust London User Group
LDN Talks May Community Showcase
2026-05-29 | Berlin, DE | Rust Berlin
Rust Berlin Talks: The next generation
2026-05-30 | Stockholm, SE | Stockholm Rust
Ferris’ Fika Forum #26
2026-06-02 | Frankfurt, DE | Rust Rhein-Main
gRPC with Rust and Tonic
2026-06-03 | Dublin, IE | Rust Dublin
Join us live and INPERSON for Rust 261
2026-06-03 | Girona, ES | Rust Girona
Rust Girona Hack & Learn 06 2026
2026-06-10 | München, DE | Rust Munich
Rust Munich 2026 / 2 - Hacking Evening
2026-06-11 | Switzerland, CH | PostTenebrasLab
Rust Meetup Geneva
2026-06-12 - 2026-06-14 | Kraków, PL | Rustmeet
Rustmeet
2026-06-16 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
Interactive: Everything is Open Source
2026-06-16 | Milano, IT | Rust Language Milan
Real-time planning in Rust: SolverForge & SERIO
2026-06-18 | Aarhus, DK | Rust Aarhus
Talk Night at Danske Commodities
North America
2026-05-27 | Austin, TX, US | Rust ATX
Rust Lunch - Fareground
2026-05-28 | Atlanta, GA, US | Rust Atlanta
Rust-Atl
2026-05-28 | Los Angeles, CA, US | Rust Los Angeles
Rust LA: Rust in Embedded & Autonomous Systems at Parallel Systems in DTLA
2026-05-28 | Mountain View, CA, US | Hacker Dojo
RUST MEETUP at HACKER DOJO
2026-05-30 | Boston, MA, US | Boston Rust Meetup
Central Cambridge Rust Lunch, May 30
2026-06-04 | Saint Louis, MO, US | STL Rust
Testing, Coverage, Tracey & Mutations
2026-06-06 | Boston, MA, US | Boston Rust Meetup
Boston Common Rust Lunch, June 6
2026-06-11 | Lehi, UT, US | Utah Rust
Utah Rust June Meetup
2026-06-11 | Mountain View, CA, US | Hacker Dojo
RUST MEETUP at HACKER DOJO
2026-06-11 | San Diego, CA, US | San Diego Rust
San Diego Rust June Meetup - Back in person!
2026-06-16 | San Francisco, CA, US | San Francisco Rust Study Group
Rust Hacking in Person
2026-06-17 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
Jiff
2026-06-18 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
June, 2026 SRUG (Seattle Rust User Group) Meetup
2026-06-24 | Austin, TX, US | Rust ATX
Rust Lunch - Fareground
2026-06-24 | Los Angeles, CA, US | Rust Los Angeles
Rust LA: Rust-Based Constraint Solvers in 2D Sketching with Zoo Technologies
South America
2026-06-18 | Florianópolis, BR | Rust SC
Rust Floripa
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 overflows the trait solver today as well as my brain
– Nadrieril on their blog
Thanks to Theemathas 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
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