This Week in Rust 659
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
Maintainer spotlight: Gen Li (@rami3l)
Together for a healthier Clippy
Newsletters
The Embedded Rustacean Issue #75
Project/Tooling Updates
copper-rs v1.0.0: the open source deterministic robotics OS is now stable.
Rayfish: Your own private network. No servers, no setup.
rama v0.3.0 — network service framework ready to be used by the wider Rust community
kache 0.9.0: supply-chain hardening + read-only CI cache
GuardianDB - PostgreSQL and P2P/Local-First Together
Nectar: a Rust-like language that compiles your whole web app to WebAssembly
logdrain: Fast, Embeddable Log-Template Mining in Rust
sheathe: Packaging the World’s Video in Pure Rust
wickra: streaming-first technical indicators
Xcelerator Solver v0.1.0 – deterministic symbolic regression
dlt-tui 1.1.0 - a fast TUI viewer for automotive DLT (AUTOSAR Diagnostic Log and Trace) files
RSSH v0.2.11 — terminal workflows, safer SSH key import, and observable AI ops
k8s-scale-app-rs: Scale or Restart a Kubernetes Deployment from a CronJob
M-vis v0.5.0-rc1 update
FlareDB: An Apache Beam Native Streaming Database built in Rust
mqtt-typed-client 0.2: a type-safe async MQTT client on rumqttc
RootAsRole: v4.0.0 Major release, secure execution, new logo
A Cross-Platform Rust UI Framework via Qt’s Bridging Technology
Jam Programming Language
Sōzu 2.1.0: UDP load balancing for the programmable edge
b0nker: a minimal container runtime written in Rust
Observations/Thoughts
[video] Rust Berlin Meetup 25/06/2026 Livestream
[video] How do you rewrite C/C++ projects to Rust? – JetBrains interview with Luca Palmieri, Mainmatter
Investigating why RustCrypto is slow: Deep dive into SIMD instructions and hardware acceleration
bool as u32
A Rust-to-Lean Verification Pipeline with AI Provers: An Experience Report
Work In Progress Rust
[video] OpenAI just spent $600k on Rust
[audio] Rising Academies with Dylan Brown - Rust in Production Podcast
Rust Walkthroughs
[series] Bevy Tutorial: Build Your First 3D Editor - Create a 3D Space on an Infinite Grid
Learn Axum Basics and Routing by Building a URL Shortener
[series] Rama 101.1: HTTPS clients and layers of abstraction
Miscellaneous
Clickable euler diagram of all the Rust week talks
Crate of the Week
This week’s crate is apis-saltans, a Zigbee implementation including a coordinator API.
Thanks to Richard Neumann 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.
* Protocol - Extend bit-exactness tests to f64 reconstruction targets * Dofigen - No image tag replacement flag for the generate command
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.
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
598 pull requests were merged in the last week
Compiler
enable eager param_env norm in new solver
lint on core::ffi::c_void as a return type
polish some macro parsing code
resolve: no allocation in resolve_ident_in(_local)_module_*
simplify option-iterator flattening in the compiler
stabilize #[my_macro] mod foo; (part of proc_macro_hygiene)
Library
add std::io::cursor::WriteThroughCursor
implement Box::as_non_null()
implement DoubleEndedIterator::next_chunk_back
implement IntoIterator for [&[mut]] Box<[T; N], A>
implement ptr::{read,write}_unaligned via repr(packed)
move SizeHint and IoHandle to core::io
move std::io::Seek to core::io
optimize ArrayChunks::try_rfold with DoubleEndedIterator::next_chunk_back
stabilize feature(atomic_from_mut)
Cargo
bindeps: register transitive artifact targets
avoid cloning parsed TOML manifest in ManifestErrorContext
avoid extra clone of parsed TOML manifest
remove unneeded cloning when parsing package index
change HashMaps and HashSets in Cargo to use Fxhasher
do not pass lint rustflags when --cap-lints=allow is set
fixed Compilation::deps_output only taking the last dep
pre-allocate a few vectors
stabilize build-dir layout v2
use a set when checking visited workspace members
Rustdoc
fix crash when trying to inline foreign item which cannot have attributes
show use-site paths for unevaluated const array lengths
Clippy
chunks_exact_to_as_chunks: Don’t report expressions with const parameters
chunks_exact_to_as_chunks: Don’t report expressions with type params
missing_trait_methods: MSRV/unstable awareness
vec_init_then_push: don’t lint pushes from a macro expansion
inline_modules: ignore cfg(test) modules in test builds
match_same_arms: keep arm-level expectations working under an outer allow
unnecessary_operation: avoid bad ! suggestions
unnecessary_unwrap_unchecked: don’t trigger inside the _unchecked fn
add required parentheses when the needless_bool suggestion is an operand
fix ICE when resolving local in unnecessary_unwrap_unchecked
fix infinite_loop false positive inside gen blocks
fix manual_c_str_literals suggestion when the trailing backslash is escaped
fix strlen_on_c_strings incorrect suggestion logic
fix suspicious_operation_groupings duplications
lint bit width
optimize Msrv::meets calls
bail out of unicode lint scans when the snippet is pure ASCII
skip the HIR parent walk in is_in_test_function when there are no test items
place generated impl block after the existing impl block
refactor StringAdd lint pass
refactor suspicious_xor_used_as_pow
remove lower_ty in uninhabited_reference
respect the configured MSRV in manual_is_variant_and’s map() == Some(_) rewrite
rewrite mut_mut
rewrite redundant_else as a late pass
rewrite tuple_array_conversions
Rust-Analyzer
SCIP: exclude leading/trailing trivia in definition ranges
SCIP: remove dead inlay_hints field
feat(ide-diagnostics): add diagnostics for invalid union patterns (E0784)
internal(query-group-macro): remove the arity test
add tree top method to Syntax node
add handler for E0627
supports multi arms for replace_match_with_if_let
fix UB in smol_str borsh_non_utf8 test cases
fix generic param for generate_default_from_enum_variant
walkthrough_create_project file not packaged
assertion failure on closure with unbound function
avoid panic in convert_tuple_struct_to_named_struct on nested pattern usage
configuration syntax for nvim-lsp
correct resolution to value when it shares the same name with type
exclude impls on the error type from impl enumeration
fix crash on extract_variable when selecting unresolved macro call
fix crash on completion inside macros
fix handling of params of coroutine fns
handle more cases of cfgs in expr store lowering
no generate with default assoc item
panics in unwrap_return_type, remove_underscore, and promote_local_to_const
hoist attribute qualifier segment collection
reduce parser joint-token allocation
project-model: don’t pass metadata extra args to sysroot
project-model: introduce cargo.configPath
provide startup time to ready log point and associated benchmark
Rust Compiler Performance Triage
This week was dominated by wild swings in benchmarks of the new-solver, which is not enabled by default, yet. Apart from that, we got a very few notable changes, only one unexpected speedup from a bugfix in rustdoc.
Triage done by @panstromek. Revision range: 7dc2c162..3659db0d
Summary:
(instructions:u) mean range count Regressions ❌ (primary) 0.2% [0.2%, 0.2%] 3 Regressions ❌ (secondary) 162.1% [0.2%, 1116.3%] 20 Improvements ✅ (primary) -1.4% [-8.4%, -0.1%] 7 Improvements ✅ (secondary) -1.1% [-8.4%, -0.1%] 11 All ❌✅ (primary) -0.9% [-8.4%, 0.2%] 10
1 Regression, 1 Improvement, 4 Mixed; 3 of them in rollups 17 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
Lint against invalid POSIX symbol definitions
Document NonNull layout guarantees
Tracking Issue for slice_split_once
Compiler Team (MCPs only)
Let the OS handle stack growth
Add target_feature_available_at_call_site
Language Reference
Empty repr(Rust) enums are ZSTs
No Items entered Final Comment Period this week for Cargo, Language Team, Leadership Council, Rust RFCs or Unsafe Code Guidelines.
New and Updated RFCs
Update RFC template
RFC: Store registry tokens in the OS credential store by default
Upcoming Events
Rusty Events between 2026-07-08 - 2026-08-05 🦀
Virtual
2026-07-08 | Virtual (Cardiff, GB) | Rust and C++ Cardiff
Operating Systems Book Club: Introduction + Processes
2026-07-08 | Virtual (Girona, ES) | Rust Girona
Sessió setmanal de codificació / Weekly coding session
2026-07-09 | Virtual (Nürnberg, DE) | Rust Nuremberg
Rust Nürnberg online
2026-07-14 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Second Tuesday
2026-07-15 | Virtual (Girona, ES) | Rust Girona
Sessió setmanal de codificació / Weekly coding session
2026-07-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
Jiff
2026-07-16 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
July, 2026 SRUG (Seattle Rust User Group) Meetup
2026-07-16 | Virtual (Berlin, DE) | Rust Berlin
Rust Hack and Learn
2026-07-19 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Rust Deep Learning: Third Sunday
2026-07-21 | Virtual (London, UK) | Women in Rust
Lunch & Learn: Learning Rust as First Programming Language
2026-07-21 | Virtual (Washington, DC, US) | Rust DC
Mid-month Rustful
2026-07-22 | Virtual (Girona, ES) | Rust Girona
Sessió setmanal de codificació / Weekly coding session
2026-07-28 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Fourth Tuesday
2026-07-29 | Virtual (Girona, ES) | Rust Girona
Sessió setmanal de codificació / Weekly coding session
2026-07-30 | Virtual (Berlin, DE) | Rust Berlin
Rust Hack and Learn
2026-08-02 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
Rust Deep Learning: First Sunday
2026-08-04 | Virtual (London, GB) | Women in Rust
👋 Community Catch Up
2026-07-29 | Virtual (Girona, ES) | Rust Girona
Sessió setmanal de codificació / Weekly coding session
2026-08-05 | Virtual (Indianapolis, IN, US) | Indy Rust
Indy.rs - with Social Distancing
Asia
2026-07-18 | Bangalore, IN | Rust Bangalore
July 2026 Rustacean Meetup
Africa:
2026-07-14 | Johannesburg, ZA | Johannesburg Rust Meetup
Debugging a production grade Open Source Rust crate
Europe
2026-07-08 | Dublin, IE | Rust Dublin
Join us live and INPERSON for Rust 262
2026-07-09 | Berlin, DE | Rust Berlin
Rust Berlin on location 🏳️🌈 - Edition 015
2026-07-09 | Frankfurt, DE | Rust Rhein-Main
Building Cross Platform Applications with Ply
2026-07-09 | Switzerland, CH | PostTenebrasLab
Rust Meetup Geneva
2026-07-15 | Dortmund, DE | Rust Dortmund
Teach and Hack at Projektspeicher
2026-07-21 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
Supercharge Rust funcs with implicit arguments and context-generic programming
2026-07-23 | Berlin, DE | Rust Berlin
Rust Berlin Talks: The next generation
2026-07-23 | London, UK | London Rust Project Group
Rama modular service framework for Rust
2026-07-23 | Paris, FR | Rust Paris
Rust meetup #87
2026-07-30 | Manchester, GB | Rust Manchester
Rust Manchester July Code Night
North America
2026-07-09 | Lehi, UT, US | Utah Rust
Utah Rust July Meetup
2026-07-09 | Mountain View, CA, US | Hacker Dojo
RUST MEETUP at HACKER DOJO
2026-07-11 | Boston, MA, US | Boston Rust Meetup
MIT Rust Lunch, July 11
2026-07-15 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
Jiff
2026-07-16 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
July, 2026 SRUG (Seattle Rust User Group) Meetup
2026-07-18 | Boston, MA, US | Boston Rust Meetup
North End Rust Lunch, July 18
2026-07-21 | San Francisco, CA, US | San Francisco Rust Study Group
Rust Hacking in Person
2026-07-22 | Austin, TX, US | Rust ATX
Rust Lunch - Fareground
2026-07-22 | Los Angeles, CA, US | Rust Los Angeles
Rust LA: Rust in Distributed Systems with Flight Science!
2026-07-25 | Boston, MA, US | Boston Rust Meetup
Porter Square Rust Lunch, July 25
2026-07-25 | Brooklyn, NY, US | Flower
BOG-A-THON 2
2026-07-30 | Atlanta, GA, US | Rust Atlanta
Rust-Atl
2026-08-01 | Boston, MA, US | Boston Rust Meetup
Chinatown Rust Lunch, Aug 1
2026-08-04 | Boston, MA, US | Boston Rust Meetup
Evening Boston Rust Meetup at Red Hat, Aug 4
Oceania
2026-07-09 | Brisbane City, QL, AU | Rust Brisbane
Rust Brisbane • July 2026
2026-07-21 | Barton, AU | Canberra Rust User Group
July Meetup
2026-07-23 | Perth, AU | Rust Perth Meetup Group
Rust Perth: July Meetup!
2026-07-30 | Melbourne, AU | Rust Melbourne
Rust Melbourne July 2026
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
if a ptr is dereferenced in a forest and nobody hears it, is it sound?
– Kornel on rust-users
Thanks to Cerber-Ursi 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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