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 our first Maintainers in Residence
• Enabling the next-generation trait solver on nightly
• Supply chain attack on arrayref
• Rust Function Overloading - Call for Experimentation

Project/Tooling Updates

• Intent to Ship: JPEG XL – Mozilla Hacks - the Web developer blog

Observations/Thoughts

• Scaling Memory Safety: AI-Assisted Rewrites of C/C++ Dependencies to Rust
• Replacing a Rust Enum with a 64-bit Word Made My Interpreter 17% Faster
• 3 Seconds of compilation shaved by metadata analysis
• Your E-Paper Panel Isn't Broken: How Retained State Makes Drivers Look Buggy
• To Async or Not to Async: Building a Rust MCP Server for rust-analyzer
• One trie, three jobs, zero benchmarks won
• Fixing Rust's supply chain security: The good, the bad and the ugly

Rust Walkthroughs

• Rust errors every beginner hits
• Build a Scientific Calculator in Rust - Understanding Variables and Types
• Proving SQLx’s Statement Cache with bpftrace
• Beyond WASI: Rust applications in-browser

Miscellaneous

• JetBrains Partners with the Rust Foundation for an AI Livestream

Crate of the Week

This week's crate is swift-topomap, a microarchitectural observability tool.

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.

Rust

• Tracking Issue for --remap-path-scope in rustdoc

Cargo

• Tracking Issue for -Zembed-metadata

No calls for testing were issued this week by 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.

• sysknife - Split the Ubuntu-only actions out of DEBIAN_ONLY_ACTIONS
• sysknife - Make Debian eligible: a version floor of 12, and a reason in is_supported
• sysknife - Debian's default firewall is nftables, and the catalogue has no nftables vocabulary

• stomatopod - Add a Docker Compose healthcheck on /health
• stomatopod - Add a custom GitHub social preview image
• stomatopod - Document the v0.1.0 GHCR tag next to :latest

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

593 pull requests were merged in the last week

Compiler

• add a cache to the WfPredicates visitor
• allow self in const generics
• eliminate some buggy unreachable!()s in expand_(option_)env()
• enable -Znext-solver on nightly by default
• optimize DeepRejectCtxt

Library

• add Arc/Rc::strong_count_from_raw
• add Default implementation for std::sync::Once
• add symmetric PartialEq impls for Vec, &[T], &mut [T] versus Cow<'_, [T]>
• core: implement float conversion methods
• make BorrowedCursor<'a, T> covariant in 'a and drop an indirection
• rework div_ceil for nonzero integers
• stabilize bool::toggle
• stabilize never type

Cargo

• config: Add build.fingerprint
• fix git gc with safe.bareRepository=explicit
• install cargo tools with locked dependencies

Rustdoc

• add new invalid_markdown_table rustdoc lint
• only generate search DOM elements if the search is actually needed
• enable scrolling only on table/code
• fix issue preventing "read more" links from generating

Rustfmt

• fix ICE on for await loops with separated keyword tokens
• fix brace placement for multiline control flow
• fix comments rewritten too long
• correct the span used when rewriting ast::TyKind::FnPtr
• correct visibility and defaultness order on associated impl type alias
• inconsistent formatting of doc comments in macros

Clippy

• optimize Clippy with PGO
• unnecessary_fold: lint folding over an Option's iterator
• unused_trait_names: make the suggestion nicer
• avoid manual_assert_eq for byte slice-like types
• don't fire manual_contains when both sides use the slice element
• fix large_futures ICE with the next solver
• avoid double_must_use in macro-generated code
• make needless_bool less aggressive for chained ifs
• perf: check first_node_in_macro before the root macro walk in useless_format
• remove broken suggestion for blocks_in_conditions
• suggest hypot for x.mul_add(x, y * y).sqrt()
• suggest is_ok/is_err for boolean Result mappings
• trigger integer_division_remainder_used on DivAssign/RemAssign

Rust-Analyzer

• hir: Use expression store of parent body if available
• adds-arrow unmap ranges when fn inside macro
• allow asm! label blocks to diverge
• prevent stack overflow for recursive ADT layouts
• optimize the heck out of the storage of token trees
• use Cargo build directory for flycheck logs

Rust Compiler Performance Triage

A busy week, with a continued stream of improvements to the next trait solver and next borrow check implementations. Other than those changes, the week was pretty quiet for performance.

Triage done by @simulacrum. Revision range: 8fa1c96c..9a4ad59a

2 Regressions, 4 Improvements, 2 Mixed; 2 of them in rollups. 28 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

• make target feature ABI check a hard error on ARM
• stabilize smart pointer map functions
• volatile: allow accesses to non-AM memory to trap
• Stabilize the supertrait_item_shadowing feature
• Add intrinsics for integer minimum and maximum
• Always escape grapheme extenders in str::escape_debug

Rust RFCs

• Change i686-pc-windows-msvc from Tier 1 with host tools => Tier 1 without host tools

Cargo

• feat(resolver): Stabilize min-publish-age

Compiler Team (MCPs only)

• Add codeview_annotation intrinsic

Leadership Council

• Update PD election process based on 2025 feedback
• Create an LLM policy team

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

• Add core::ffi::c_longdouble
• RFC: add freeze operation

Upcoming Events

Rusty Events between 2026-08-26 - 2026-09-23 🦀

Virtual

• 2026-08-26 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Operating Systems Book Club: Lottery and Multi-CPU Scheduling
• 2026-08-27 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-28 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-31 | Virtual | Rust 🦀 Maven
  • Workshop: Add tests to an open source Rust project
• 2026-09-01 | Virtual | Rust 🦀 Maven
  • Tauri: Cross-Platform desktop applications with Rust and web technologies
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-04 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-06 | Virtual | Rust 🦀 Maven
  • Facts: Curated Knowledge for Humans and Agents
• 2026-09-06 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: First Sunday
• 2026-09-08 - 2026-09-11 | Hybrid (Montreal, CA) | RustConf 2026
  • RustConf 2026
• 2026-09-08 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-09-08 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2026-09-10 | Virtual | Rust 🦀 Maven
  • Solving Real-World Planning Problems in Rust with SolverForge
• 2026-09-10 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-09-10 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-09-15 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-09-16 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2026-09-17 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • September, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-09-18 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-20 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: Third Sunday
• 2026-09-22 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday Rust Bookclub

Africa

• 2026-09-08 | Johannesburg, ZA | Johannesburg Rust Meetup
  • Rust's extended standard library

Asia

• 2026-08-29 | Pune, IN | Rust Pune
  • Rust Pune Meetup: August 2026

Europe

• 2026-08-26 | Copenhagen, DK | Copenhagen Rust Community
  • Rust meetup #71 Sponsored by Factbird
• 2026-08-26 | Dresden, DE | Rust Dresden
  • Third Meetup
• 2026-08-27 | London, UK | Rust London User Group
  • LDN Talks August Community Showcase
• 2026-08-27 | Manchester, UK | Rust Manchester
  • Rust Manchester August Talks
• 2026-08-29 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #29
• 2026-09-08 | Paris, FR | Rust Paris
  • Rust meetup #87
• 2026-09-14 - 2026-09-16 | Berlin, DE | Oxidize 2026
  • Oxidize 2026
• 2026-09-15 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Reproducing scientific papers - with Rust & "AI"
• 2026-09-22 | Prague, CZ | Rust Prague
  • Rust Meetup Prague @ Rockwell Automation

North America

• 2026-08-26 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-08-26 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA August! Rust in Quantum Computing
• 2026-08-27 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-09-03 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-09-03 | Saint Louis, MO, US | STL Rust
  • Cryptography + Quantum Computers
• 2026-09-08 - 2026-09-11 | Hybrid (Montreal, CA) | RustConf 2026
  • RustConf 2026
• 2026-09-09 | Montreal, CA | Women in Rust
  • RustConf Coffee Break Meetup
• 2026-09-10 | Lehi, UT, US | Utah Rust
  • Hands-on Embedded Rust
• 2026-09-10 | San Diego, CA, US | San Diego Rust
  • San Diego Rust September Meetup - Back in person!
• 2026-09-15 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-09-16 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2026-09-17 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • September, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-09-17 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-09-23 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground

Oceania

• 2026-08-27 | Melbourne, AU | Rust Melbourne
  • Rust Melbourne August 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

I care about this community, including its human and social nature. I want others to appreciate those qualities, and I don't want to see them compromised and replaced by excessive machine-generated content.

– Quine Dot on rust-users

Thanks to Jonas Fassbender 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

• Experiment in reducing target directory size on nightly

Newsletters

• The Embedded Rustacean Issue #78

Project/Tooling Updates

• OxiSH: a modern, memory-safe SSH server
• A critical review of Xilem in 2026
• rama v0.4.0

Observations/Thoughts

• From Go to Rust
• What Zig felt like, coming from Rust
• I want extern "fil-c"
• Four levels of in-place initialization
• Protecting the Rust standard library from accidental breakage
• Zero-copy wgpu rendering inside an Electron app
• The Lint That Would Have Caught It Is Off by Default
• [video] [series] Implementing State Machines (Part 1)

Rust Walkthroughs

• A gentle introduction to Embedded Rust
• Building a Containerized RESTful API

Research

• GPU Offload in Rust: Portable, Safe, and Fast

Miscellaneous

• Zerocopy with Joshua Liebow-Feeser

Crate of the Week

This week's crate is tokio_with_wasm, a crate that lets a single tokio codebase run both natively and in web browsers.

Thanks to Kim Dong-Hyun 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.

Cargo

• Tracking Issue for -Zembed-metadata

No calls for testing were issued this week by Rust, 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.

• sysknife - Export the audit chain rows, not just the verify verdict
• sysknife - Expose the read-only actions as MCP tools without exposing AptUpdate
• sysknife - Record a current Fedora Atomic validation run
• YantrikDB - Migrate the 7 remaining manual SAVEPOINT sites to SavepointGuard (panic-unwind hole + 7 hand-rolled copies of the unwind rule)
• RustAPI - chore: issue templates, drop missing triage label, MSRV 1.85 (easy)
• KayaDB - test: one extra named malformed WAL / command-frame decoder case (easy)
• Cordial - GameActivity.getWaterfallInsets has the wrong JNI descriptor
• Cordial - ro.soc.manufacturer is answered with an empty string
• Cordial - Map which FLog channels take a number and which take a severity name

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

613 pull requests were merged in the last week

Compiler

• inline some hot new-solver functions
• stabilize -Zprofile-sample-use
• stabilize extern "custom"
• make ShardedHashMap::with_capacity split capacity between shards
• three new-solver speedups
• use TyOrConstInferVar in the next solver, fix #158441

Library

• add core::num::Complex
• Arc: remove unnecessary fmt::Display use for overflow assertion
• core/num: implement feature float_nan_to
• core: implement FusedIterator for StepBy
• experiment: add core::cmp::smallest and core::cmp::largest
• Iterator::{min,max}(_by_key) should use overridden min/max/lt
• offload! function-like macro
• optimize CStr backing slice bounds checks
• single-byte ASCII searcher for StrSearcherImpl(pattern.rs)

Cargo

• trim-paths: honor workspace prefix override from env
• frontmatter: Don't panic on a short closing fence before a non-ASCII char
• min-publish-age: remove registry.min-publish-age
• enable -Zembed-metadata=no by default on nightly Cargo
• re-stabilize build-dir layout v2
• remove unremap file when running cargo clean -p in new build-dir layout

Rustdoc

• add basic splat support to rustdoc
• add new unused_footnote_definition rustdoc lint
• also warn if an invalid doc attribute is used on a macro invocation

Clippy

• add option_zip_none lint
• clean-up used_underscore_*
• fix ICE on unnecessary_rest_pattern for TyAlias
• fix unfulfilled_lint_expectations incorrectly triggered by #[expect(clippy::let_and_return)]
• fix duplicate diagnostics for min_rust_version_invalid_attr
• perf: check fn kind before the expansion walk in missing_const_for_thread_local
• perf: resolve the callee before the expansion walk in VecArgs::hir
• perf: run in_external_macro after the cheap checks in five hot lint paths

Rust-Analyzer

• parser: frontmatter error path for UTF-8
• avoid panic for mismatched associated type parameters
• check original type for replace_arith_op
• consider loop containing break expr to diverge if expr is diverging
• do not panic when defined in macro from input
• don't error on tail comma for some macro
• emit E0600 when unary !/- is applied to unsupported type
• every workspace should have a proc-macro server
• fix rustc_private support for rustc_proc_macro
• lower range expressions in hir lowering
• return an error const to the solver when consteval fails
• offer replace_arith on references to ints
• support Reborrow and CoerceShared built-in derives

Rust Compiler Performance Triage

There were almost no regressions this week, while the next trait solver saw several significant performance improvements!

Triage done by @kobzol. Revision range: 771916f9..8fa1c96c

Summary:

0 Regressions, 6 Improvements, 7 Mixed; 4 of them in rollups 50 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: Refactor the libs team

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

• Always escape grapheme extenders in str::escape_debug
• feat: add symmetric PartialEq impls for Vec, &[T], &mut [T] versus Cow<'_, [T]>
• stabilize smart pointer map functions
• Stabilize windows_process_extensions_main_thread_handle
• Add Default implementation for std::sync::Once
• target_features: sse (or at least avx2) is incompatible with soft-float ABI
• Remove From<!> for T reservation impl
• stabilize Box::take
• Extend dropping_{references,copy_types} lints to drop_in_place
• lint on more incorrect usages of core::ffi::c_void
• Make let-else respect macro_rules expr metavariable grouping

Cargo

• feat(resolver): Stabilize min-publish-age
• feat(diag): Stabilize cargo-lints

Compiler Team (MCPs only)

• Expose target_abi = "v8plus" on sparc-unknown-linux-gnu

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

• Change i686-pc-windows-msvc from Tier 1 with host tools => Tier 1 without host tools
• Owning references (&own T)

This RFC will appear in the Call for Testing section of the next issue (#) of This Week in Rust (TWiR). You may remove the call-for-testing label. Please feel free to leave the call-for-testing label in place if you would like this RFC to appear again in another issue of TWiR.

Upcoming Events

Rusty Events between 2026-08-19 - 2026-09-16 🦀

Virtual

• 2026-08-19 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-20 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Tock OS Part #5 — Wireless Communication with the IEEE 802.15.4 protocol
• 2026-08-21 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-25 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2026-08-26 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Operating Systems Book Club: Lottery and Multi-CPU Scheduling
• 2026-08-27 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-28 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-31 | Virtual | Rust 🦀 Maven
  • Workshop: Add tests to an open source Rust project
• 2026-09-01 | Virtual | Rust 🦀 Maven
  • Tauri: Cross-Platform desktop applications with Rust and web technologies
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-04 | Virtual | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-06 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Rust Deep Learning: First Sunday
• 2026-09-08 - 2026-09-11 | Hybrid (Montreal, CA) | RustConf 2026
  • RustConf 2026
• 2026-09-08 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-09-08 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up
• 2026-09-10 | Virtual | Rust 🦀 Maven
  • Solving Real-World Planning Problems in Rust with SolverForge
• 2026-09-10 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-09-10 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-09-15 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-09-16 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out

Africa

• 2026-09-08 | Johannesburg, ZA | Johannesburg Rust Meetup
  • Rust's extended standard library

Asia

• 2026-08-22 | Bangalore, IN | Rust Bangalore
  • August 2026 Rustacean Meetup
• 2026-08-22 | Delhi, IN | Rust Delhi
  • Rust Delhi X SciPy India Meetup
• 2026-08-22 | Noida, IN | SciPy India
  • Scientific Computing in Rust and Python
• 2026-08-29 | Pune, IN | Rust Pune
  • Rust Pune Meetup: August 2026

Europe

• 2026-08-20 | Berlin, DE | Rust Berlin
  • Rust Summer Party!
• 2026-08-20 | Frankfurt, DE | Rust Rhein-Main
  • Building an acoustic camera with egui and embassy
• 2026-08-21 | Edinburgh, UK | Rust and Friends
  • Rust and Friends (daytime coffee)
• 2026-08-26 | Dresden, DE | Rust Dresden
  • Third Meetup
• 2026-08-27 | Manchester, UK | Rust Manchester
  • Rust Manchester August Talks
• 2026-08-29 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #29
• 2026-09-08 | Paris, FR | Rust Paris
  • Rust meetup #87
• 2026-09-14 - 2026-09-16 | Berlin, DE | Oxidize 2026
  • Oxidize 2026
• 2026-09-15 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Reproducing scientific papers - with Rust & "AI"

North America

• 2026-08-19 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-19 | San Francisco, CA, US | Bay Area Rust
  • Bay Area Rust August Meetup
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-20 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-08-20 | New York, NY, US | Rust NYC
  • Rust NYC: 'Data Shapes Your Memory' and 'Rust in Peace'
• 2026-08-26 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-08-26 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA August! Rust in Quantum Computing
• 2026-08-27 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-09-03 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-09-03 | Saint Louis, MO, US | STL Rust
  • Cryptography + Quantum Computers
• 2026-09-08 - 2026-09-11 | Hybrid (Montreal, CA) | RustConf
  • RustConf
• 2026-09-08 | Montreal, QC, CA | Rust Foundation
  • Rust Teams Health Summit
• 2026-09-08 - 2026-09-11 | Montreal, QC, CA | RustConf 2026
  • RustConf 2026, Hosted by the Rust Foundation
• 2026-09-09 | Montreal, CA | Women in Rust
  • RustConf Coffee Break Meetup
• 2026-09-10 | San Diego, CA, US | San Diego Rust
  • San Diego Rust September Meetup - Back in person!
• 2026-09-15 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-09-16 | Hybrid (Vancouver, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out

Oceania

• 2026-08-27 | Melbourne, AU | Rust Melbourne
  • Rust Melbourne August 2026
• 2026-08-27 | Melbourne, AU | Rust Melbourne
  • Rust Melbourne Meetup

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

ass-bind is peak

– Clar Fon on rust-zulip discussion "assumptions on binders" abbreviations

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

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

• Call for testing: Restricting trait implementability and field mutability

Foundation

• Rust Team Health Summit: September 8 in Montréal
• Catching Up with the Rust Content Team: RustWeek Interviews and a New Changelog Series

Newsletters

• This Month in Rust OSDev: July 2026

Project/Tooling Updates

We are making changes to the Project/Tooling Updates Section - see here for more details

• Bevy's Sixth Birthday
• fearless_simd v0.7: 64-bit integers, improved generics, SSE2, and upcoming v1.0
• vairedb 0.1.0 - Cloud Native Distributed Analytical Database
• OXVG 0.0.7: introducing an SVG-to-JSX transformer to the OXVG toolchain
• HTML, JavaScript, CSS should have died long ago
• Even more formal verification for BPF
• kache 0.14.0: debuggable restores and cross-clone convergence
• kobe 0.39.0: hardening the cluster-lease lifecycle
• renew 0.1.1: a deterministic, code-first game engine
• GRIT 1.1: type-check your quantized tensors
• floDl: Introducing AMD GPU support
• git-cache-proxy: read-only cache for git

Observations/Thoughts

• A Vision for Cargo
• Cyclic trait implementations: motivation
• Rust SIMD on the GPU
• Rewriting in Rust: Performance, Failures, 2026 Reality Check
• RangeFrom, Part 1..: History and background
• Typed Conversations: Make Illegal Agent Dialogues Unrepresentable
• ECQV: implicit certificates, and why I kept them out of the project that motivated them
• TLS Handshakes: Measuring the Performance of 4 Cryptography Libraries
• Building scalable backend services with Rust and PostgreSQL
• PoC for universal hardware-in-the-loop HAL test suite — Tweede golf
• [video] FLOSS 878 - A Tool With Opinions

Rust Walkthroughs

• Downcasting Arcs in Rust
• Profiling Rust with hotpath-rs: The Complete Guide - From SQL Queries to CPU Sampling
• A chip-agnostic architecture for bare-metal embedded Rust

Research

• Rust Coreutils: Rebuilding Unix Foundations in a Modern Language

Miscellaneous

Crate of the Week

This week's crate is literator, a crate for efficiently displaying the items of an iterator without temporary allocations.

Thanks to Nora 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.

• Diesel - Improve the documentation of our derives
• pulse_map - Add cargo-fuzz harness for insert/get/remove sequences
• pulse_map - Add 24-hour soak test for ConcurrentPulseMap and ShardedPulseMap
• pulse_map - Add loom tests for MetaWord AtomicU64 CAS correctness
• pulse_map - Add CI job to verify no_std compilation on thumbv7m-none-eabi
• pulse_map - Run Miri on test suite to detect undefined behavior in unsafe code

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

698 pull requests were merged in the last week

Compiler

• check the fallback map before queueing child in visible_parent_map breadth-first search
• enable polonius alpha on nightly
• improve canonical_param_env_cache
• interpret: skip deref-projection validity checks when they are not needed
• optimize crate resolution for large workspace
• optimize handling of solver errors
• optimize try_evaluate_obligations
• perf: cache already-checked types in the privacy visitor
• perf: lock-free root fast paths for hygiene queries
• perf: skip irrelevant foreign impls when building the specialization graph
• perf: store the fulfillment engine inline in ObligationCtxt
• shallow resolve ty and const vars to their root vars, attempt 2
• speed up EverInitializedPlaces
• split apply_primary_terminator_effect
• stabilize c_variadic_naked_functions

Library

• add fast path to escape_string_symbol
• core: generalize BorrowedCursor::ensure_init
• hint that memchr returns an in-bounds index
• implement <OnceCell,OnceLock>::new_init
• implement to_string() on ByteStr and ByteString
• introduce a PinSafePointer trait that generalizes PinCoerceUnsized
• mark const ptr methods and free functions as inline(always) to match *mut
• optimize slice::contains for one-byte BytewiseEq types
• single-pass ASCII lower/upper case conversion
• stabilize fs_set_times

Cargo

• docs(changelog): Pull the --verbose item
• docs(ref): Add missing config env variables
• feat(log): emit build-started JSON message with run_id
• feat(profile): Add built-in profile debug
• feat(resolver): Report the min-publish-age in the lock message
• feat(toml): allow overriding inherited default-features in 2024
• feat(trim-paths): emit unremap files for final artifacts
• fix(clean): respect target with --doc
• fix(diag): Ensure diagnostic titles work without snippets
• fix(diag): Gate blanket_hint_mostly_unused with -Zprofile-hint-mostly-unused
• fix(diag): Remove complexity, perf, and nursery lint groups
• fix(git): Avoid use of git's core.fsmonitor
• fix(lock): Use more accurate 'highest, rather than 'latest'
• fix(resolver): Make min-publish-age relative to --publish-time
• fix(trim-paths): /cargo/deps fallback sources
• fix(trim-paths): workspace remap under -Zroot-dir
• refactor(resolver): resolve() does not need an optional gctx
• revert(compiler): forward verbose flag to rustc for local crates
• test(trim-paths): exercise unremap files with debuggers
• doc: don't use mergeable info and json together
• fix funding link
• refactor: remove unnecessary mut in sources
• test: handle non-deterministic compilation order

Rustdoc

• Create output file after we checked that the standalone markdown file is valid
• Do not take doc(cfg()) into account when filtering doctests

Clippy

• cast_possible_truncation: fix try_from suggestion expanding macros
• don't lint semicolon_if_nothing_returned in #[automatically_derived] …
• fix needless_range_loop suggests wrongly for nested index
• needless_bool: lint the early-return guard form
• new lint: nonzero operators and methods
• redundant_pattern_matching: parenthesize guarded matches! suggestion
• unwrap_or_default: respect MSRV for raw-pointer Default impls

Rust-Analyzer

• account for trailing line continuations in byte strings
• support #[rustc_must_implement_one_of] in the assists
• add replace_arith_with_strict assist
• term_search exclude useless target type
• add parens on some common cases for type_mismatch
• allow struct literals in match guards inside let exprs
• always allocate anon consts for c-strings/byte-strings literals
• avoid array len type mismatch with string panic
• avoid escaping bound vars produced by infer_method_call's skip_binder
• bound macro expansion depth across body and block boundaries
• do not consider locals of async fn as upvars of the returned coroutine
• do not declare the value NS constructor for structs/enum variants if it does not exist
• don't panic when a lifetime is passed to an ident metavariable
• fix 'no entry found for key' panic in VFS
• fix upvars query of const block inside closure
• fixed positive diagnostic for valid code
• initialize macro_depth to the file's macro depth in docs.rs and assoc.rs
• let Param::parent_fn return function for BuiltinDeriveImplMethod methods
• normalize associated types in orphan checks
• off-by-one in lifetime binders when lowering dyn Trait<'a>
• optimize memory usage of the item tree
• parse inline asm with keyword as operand name
• parse or pattern after range pattern
• preserve trailing text when InsertReplaceEdit is unsupported
• remove extra spaces in full function signatures
• support macros in #[doc] attributes in IDE features
• unresolved type variables shouldn't escape impl selection
• when searching for a pub macro, consider it available to reverse dependencies

Rust Compiler Performance Triage

This week so many new performance improvements landed that we needed to roll 10 of them up together to keep the bors queue manageable, great work! Also new is the LLVM 23 update which caused massive compile-time, run-time, bootstrap time and artifact size improvements. These improvements are reduced by the merge of Polonius Alpha on nightly causing a 3.0% regression. There still seems to be some potential to mitigate this regression.

Triage done by @JonathanBrouwer. Revision range: 65dd30fb..771916f9

Summary:

1 Regression, 4 Improvements, 7 Mixed; 5 of them in rollups 25 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:

• Cargo: hints.min-opt-level
• Add extern "custom"

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

• std: map ENOTSUP to ErrorKind::Unsupported- #158580
• feat: add symmetric PartialEq impls for Vec, &[T], &mut [T] versus Cow<'_, [T]>
• Add Default implementation for std::sync::Once
• Extend dropping_{references,copy_types} lints to drop_in_place
• lint on more incorrect usages of core::ffi::c_void
• target_features: sse (or at least avx2) is incompatible with soft-float ABI
• Make let-else respect macro_rules expr metavariable grouping
• PowerPC inline ASM: Fix scalar floats being in the wrong vector lane on little endian
• stabilize Box::take
• make closures act like MaybeDangling
• enable next solver by default in orphanck
• Error on projection of dyn noncompat type in old trait solver
• Stabilize -Zprofile-sample-use

Compiler Team (MCPs only)

• Stop using dlltool for generating import libraries on MinGW
• Promote riscv64a23-unknown-linux-gnu to Tier 2 with host tools
• Drop tier 2 i686-pc-windows-gnu host tools

Leadership Council

• Allocate more funds for the Funding team in 2026
• Allocate more funds to 2026 travel budget

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

• RFC: Support External Linkers

Upcoming Events

Rusty Events between 2026-08-12 - 2026-09-09 🦀

Virtual

• 2026-08-13 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-13 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-08-14 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-16 | Virtual (Bangalore, IN) | Embedded Rust
  • Silicon Sundays #2
• 2026-08-18 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-08-19 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-20 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Tock OS Part #5 — Wireless Communication with the IEEE 802.15.4 protocol
• 2026-08-21 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-25 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2026-08-27 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-28 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-31 | Virtual (Global) | Rust Maven
  • Workshop: Add tests to an open source Rust project
• 2026-09-01 | Virtual (Global) | Rust Maven
  • Tauri: Cross-Platform desktop applications with Rust and web technologies
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-09-04 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-08 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-09-08 | Virtual (London, UK) | Women in Rust
  • 👋 Community Catch Up

Africa

• 2026-09-08 | Johannesburg, ZA | Johannesburg Rust Meetup
  • Rust's extended standard library

Asia

• 2026-08-22 | Bangalore, IN | Rust Bangalore
  • August 2026 Rustacean Meetup
• 2026-08-22 | Delhi, IN | Rust Delhi
  • Rust Delhi X SciPy India Meetup
• 2026-08-22 | Noida, IN | SciPy India
  • Scientific Computing in Rust and Python
• 2026-08-29 | Pune, IN | Rust Pune
  • Rust Pune Meetup: August 2026

Europe

• 2026-08-13 | Switzerland, CH | PostTenebrasLab
  • Rust Meetup Geneva
• 2026-08-18 | Aarhus, DK | Rust Aarhus
  • Hack Night: Trust but verify the LLM
• 2026-08-18 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Topic TBD
• 2026-08-20 | Frankfurt, DE | Rust Rhein-Main
  • Building an acoustic camera with egui and embassy
• 2026-08-27 | Manchester, UK | Rust Manchester
  • Rust Manchester August Talks

North America

• 2026-08-13 | Lehi, UT, US | Utah Rust
  • Utah Rust August Meetup
• 2026-08-13 | San Diego, CA, US | San Diego Rust
  • San Diego Rust August Meetup - Back in person!
• 2026-08-15 | San Francisco, CA, US | Flower
  • BOG-A-THON 3
• 2026-08-18 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-08-19 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-19 | San Francisco, CA, US | Bay Area Rust
  • Bay Area Rust August Meetup
• 2026-08-20 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-08-20 | New York, NY, US | Rust NYC
  • Rust NYC: 'Data Shapes Your Memory' and 'Rust in Peace'
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-26 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-08-26 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA August! Rust in Quantum Computing
• 2026-08-27 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl
• 2026-09-03 | Saint Louis, MO, US | STL Rust
  • Cryptography + Quantum Computers
• 2026-09-08 | Montreal, QC, CA | Rust Foundation
  • Rust Teams Health Summit
• 2026-09-08 - 2026-09-11 | Montreal, QC, CA | RustConf 2026
  • RustConf 2026, Hosted by the Rust Foundation
• 2026-09-09 | Montreal, QC, CA | Women in Rust
  • RustConf Coffee Break Meetup

Oceania

• 2026-08-27 | Melbourne, AU | Rust Melbourne
  • Rust Melbourne Meetup

If you are running a Rust event please add it to the calendar to get it mentioned here. Please remember to add a link to the event too. Email the Rust Community Team for access.

Jobs

Please see the latest Who's Hiring thread on r/rust

Quote of the Week

The AI discussion was already put to bed as off topic and derailing. Do not summon the Mods so carelessly, as they are wroth, and filled with cruel vengeance.

– Simon Buchan on rust-users

Thanks to Jonas Fassbender 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

• Enabling the next iteration of the borrow checker on nightly
• Funding team progress update
• rust-lang/rust is adopting an LLM policy
• All Hands 2026 retrospective

Newsletters

• The Embedded Rustacean Issue #77

Project/Tooling Updates

• Kevat 0.4.0 — fast, resumable copy and move to external drives, now with a GUI on all three platforms
• kache 0.13.0: keying the env vars proc-macros read
• kobe 101: lease a Kubernetes cluster, don't create one
• Rewriting FalkorDB in Rust: Make It Work, Make It Stable
• Announcing webrtc v0.20.0: Async-Friendly, Runtime-Agnostic WebRTC on Sans-I/O Core rtc
• Proxelar 0.5.0: sessions, rules, and more ways to capture traffic
• mirador 1.0.0: a personal terminal dashboard
• BitFun 0.2.15: an open-source desktop AI agent built on a Rust runtime
• mvis v0.5.0: CI/CD Profiling & Allocation Histograms
• multicalc 0.9.0: scientific computation for embedded and robotics systems
• Auto-correcting wrong-layout typing on Wayland is nearly impossible. We did it anyway
• wimux 0.1.0: a native Windows terminal multiplexer
• amtr: a btop-style context-window monitor for Claude Code sessions, and the forensic autopsy of its own 153-hour build
• RSigma v0.20.0 release
• The State of RSigma, and Part Two: The Loop

Observations/Thoughts

• How Firecracker microVMs work under the hood to sandbox untrusted code and AI agents
• Faster floating point math with Rust’s new API
• Rust MEMS drivers: 3 reasons to try and adopt our new sensor driver
• The Bedrock of Software Design | Alex Fedoseev
• Tail-Call Interpreters in Rust
• How to speed up the Rust compiler in July 2026
• Sovereign Tech Fellowship for Rust maintenance (June-July 2026 report)
• An old-new take on argument parsing in Rust
• Stateless Servers, Stateful Payloads: Sessions vs Continuations, Measured in Rust
• [video] Rust in the age of Generative AI with Niko, Allen & Zeeshan
• [audio] Rust in Production S06 E09: JetBrains with Orhun Parmaksız
• Work-Stealing vs. Executor-Per-Thread: Evaluating different HTTP server workloads with Tokio, Smol and Glommio
• Your #[target_feature(enable = "avx2")] does nothing on x86_64-unknown-uefi
• Three bugs my AI agents couldn't fix

Rust Walkthroughs

• Blinking an LED on STM32 Blue Pill (STM32F103C8T6) with Embedded Rust
• Branchless Rust: Making a Filter 4x Faster by Removing an if
• Why modern font metrics cannot reproduce Word pagination
• Building hooklog on a six-day-old framework

Crate of the Week

This week's crate is index_type, a crate for providing strongly typed indices for collections.

Thanks to Roee Shoshani 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.

• Cordial - Unify the two implementations of the profile lock
• Cordial - Fullscreen clips and letterboxes until the workspace is switched away and back
• Dofigen - Extend Dockerfiles

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

630 pull requests were merged in the last week

Compiler

• improve CFG traversal
• perf: avoid a heap allocation per basic block in MoveData's location maps
• stabilize passing 128-bit integers via vector registers with asm! on x86

Library

• a bit optimize four-digit chunks in integer formatting
• add NEON support for is_ascii and eq_ignore_ascii_case
• add semver check test command for checking API compatibility of stdlib
• allow only implementing Read::read_buf
• core: implement bounded random sampling
• iter: specialize Take::count using advance_by
• iter: specialize advance_by method of Fuse
• make atomic operations const
• move std::io::copy to alloc::io
• stabilize size_of_val_raw, align_of_val_raw, Layout::for_value_raw

Cargo

• add a suggestion when adding [lints] to a workspace to use [workspace.lints] instead
• avoid parsing unchanged lockfiles
• completions: complete paths for cargo run arguments
• fix manual_readme lint for lower-priority README files
• git: make checkout names independent of git config
• make __CARGO_TEST_FORCE_ARGFILE available in distributed builds
• pass rustdoc flags to final CCI merge step
• prevent panic when package.build is empty
• reworked how we enable the new build-dir layout on nightly
• trim-paths: unambiguous and reversible remap rules

Rustdoc

• label badge for notable traits
• rustdoc-json: make Stability compatible with non-self-describing serde formats
• fix ICE when a grapheme cluster joins a Prepend-class character to _ or :
• fix crash when trying to list attributes on an opaque type
• only analyze head of self type when deciding impl inlining

Rustfmt

• format cfg_select!

Clippy

• manual_div_ceil: avoid suggestions that change evaluation count
• fix no_effect_underscore_binding false positive on proc-macro generated code
• add check for image with embedded link to doc_paragraphs_missing_punctuation
• lint for UFCS call in clone_on_copy
• trigger float_cmp_const for assert_eq! with const floats

Rust-Analyzer

• allow self as the last segment of a path
• correctly handle unlinked module edge cases
• support CovariantUnsafeCell
• add -Zjson-target-spec on cargo calls where needed
• add reference for same name param coerce matches
• allow diverging rhs in destructuring assignments
• avoid panic when checking Copy for hrtb closure arguments
• detect the rust-analyzer component in a multi-line components array
• do not alloc anon consts for bare paths in blocks
• don't panic on a self-referential impl Trait function
• double stack size for threads to 16MiB
• exclude unknown types from term search
• fix lookup MACRO_CALL@... in this Semantics due to include!
• fix ExprScopes handling of exprs inside patterns
• fix glob import shadowing bug
• make mir debug execution work fot bitflags items
• mark auto traits as coinductive
• no hint with similar name raw-ident arg
• parse postfix range inside closure in access
• recognize format arguments after a backslash in raw strings
• resolve assignment lhs in its expression scope
• show qualified paths when type names collide in E0308
• hir-ty, ide-diagnostics: use E0057/E0061 for arg-count mismatch (was E0107)
• perf: avoid having a separate query for defined opaques
• perf: save an allocation in lifetime handling
• report a config error for postfix snippets with item scope
• vfs: use component-based path prefix matching for virtual paths

Rust Compiler Performance Triage

A lot of optimizations landed this week. Some big improvements to rustdoc in #159854, one big improvement in control flow graph traversal for cranelift-codegen, few more improvements to next-solver benchmarks and various other micro-optimizations, bringing the total to a nice round number of 10 improvements this week.

Triage done by @panstromek. Revision range: ad0c9dce..65dd30fb

Summary:

1 Regression, 5 Improvements, 11 Mixed; 6 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:

• 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

• Tracking Issue for core_io_borrowed_buf
• Tracking Issue for derive_macro_global_path
• stabilize c_variadic_naked_functions

Compiler Team (MCPs only)

• Implement a naming convention for lint/diagnostic-only rustc_ attrs
• Encode OpenBSD -current version in targets' target_env
• Add target_feature_available_at_call_site
• Promote wasm32-wasip3 to Tier 2

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

• No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2026-08-05 - 2026-09-02 🦀

Virtual

• 2026-08-05 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Operating Systems Book Club: Execution and Scheduling
• 2026-08-05 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2026-08-07 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-10 | Hybrid (Kuala Lumpur, Malaysia) | Rust Malaysia Meetup
  • Rust Meetup August 2026
• 2026-08-11 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Second Tuesday
• 2026-08-13 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-13 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2026-08-14 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-18 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2026-08-19 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-20 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Tock OS Part #5 — Wireless Communication with the IEEE 802.15.4 protocol
• 2026-08-21 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-08-25 | Virtual (Dallas, TX, US) | Dallas Rust User Meetup
  • Fourth Tuesday
• 2026-08-27 | Virtual (Berlin, DE) | Rust Berlin
  • Rust Hack and Learn
• 2026-08-21 | Virtual (Girona, ES) | Rust Girona
  • Sessió setmanal de codificació / Weekly coding session
• 2026-09-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing

Africa

• 2026-08-11 | Johannesburg, ZA | Johannesburg Rust Meetup
  • Rust's extended standard library

Asia

• 2026-08-10 | Hybrid (Kuala Lumpur, MY) | Rust Malaysia Meetup
  • Rust Meetup August 2026
• 2026-08-22 | Bangalore, IN | Rust Bangalore
  • August 2026 Rustacean Meetup
• 2026-08-22 | Delhi, IN | Rust Delhi
  • Rust Delhi X SciPy India Meetup
• 2026-08-22 | Noida, IN | SciPy India
  • Scientific Computing in Rust and Python
• 2026-08-29 | Pune, IN | Rust Pune
  • Rust Pune Meetup: August 2026

Europe

• 2026-08-05 | Köln, DE | Rust Cologne
  • Rust in August: Don't panic! …or_else?
• 2026-08-06 | Berlin, DE | Rust Berlin
  • Rust Berlin on location 🏳️‍🌈 - Edition 016
• 2026-08-06 | Oxford, UK | Oxford ACCU/Rust Meetup.
  • ACCU/Rust Summer social
• 2026-08-13 | Switzerland, CH | PostTenebrasLab
  • Rust Meetup Geneva
• 2026-08-18 | Aarhus, DK | Rust Aarhus
  • Hack Night: Trust but verify the LLM
• 2026-08-18 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • Topic TBD
• 2026-08-20 | Frankfurt, DE | Rust Rhein-Main
  • Building an acoustic camera with egui and embassy
• 2026-08-27 | Manchester, GB | Rust Manchester
  • Rust Manchester August Talks

North America

• 2026-08-06 | Mountain View, CA, US | Hacker Dojo
  • RUST MEETUP at HACKER DOJO
• 2026-08-06 | Saint Louis, MO, US | STL Rust
  • Shipping Temporal: How a Global Rust Ecosystem Built Chrome’s Newest Web API
• 2026-08-11 | New York, NY, US | Rust NYC
  • Rust NYC: 'An intro to wgpu' and 'Let's Talk Generics!'
• 2026-08-13 | Lehi, UT, US | Utah Rust
  • Utah Rust August Meetup
• 2026-08-13 | San Diego, CA, US | San Diego Rust
  • San Diego Rust August Meetup - Back in person!
• 2026-08-15 | San Francisco, CA, US | Flower
  • BOG-A-THON 3
• 2026-08-18 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2026-08-19 | Hybrid (Vancouver, BC, CA) | Vancouver Rust
  • Dealing with Dependencies
• 2026-08-19 | San Francisco, CA, US | Bay Area Rust
  • Bay Area Rust August Meetup
• 2026-08-20 | Hybrid (Seattle, WA, US) | Seattle Rust User Group
  • August, 2026 SRUG (Seattle Rust User Group) Meetup
• 2026-08-26 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2026-08-26 | Los Angeles, CA, US | Rust Los Angeles
  • Rust LA August! Rust in Quantum Computing
• 2026-08-27 | Atlanta, GA, US | Rust Atlanta
  • Rust-Atl

Oceania

• 2026-08-27 | Melbourne, AU | Rust Melbourne
  • Rust Melbourne Meetup

South America

• 2026-08-08 | São Paulo, SP | Rust-SP
  • Rust SP - Aug/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

… but I gave up on the idea as the macro rules were turning into a turing complete rust syntax parser

– Koosha on rust-users

Thanks to miro 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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Discuss on r/rust