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 on X (formerly Twitter) 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 1.81.0
• Changes to impl Trait in Rust 2024

Foundation

• September 2024 Leadership Council Update

Newsletters

• Scientific Computing in Rust #2 (September 2024)

Project/Tooling Updates

• Next-gen builder macro Bon 2.2 release 🎉. Derive syntax and cfg support 🚀
• Redox OS 0.9.0 - Redox - Your Next(Gen) OS

Observations/Thoughts

• Rust on RP2350
• How we Built 300μs Typo Detection for 1.3M Words in Rust
• Compressing strings with FSST
• Local code intel using Ollama with Rust, Qdrant, FastEmbed and OpenTelemetry
• WebP: The WebPage compression format
• Porting C to Rust for a Fast and Safe AV1 Media Decoder
• Optimizing rav1d, an AV1 Decoder in Rust
• An Optimization That's Impossible in Rust!
• Why I started livestreaming as a Rust developer?
• What’s So Hard About Hashing Data?
• Module-companion for a standalone function - associated items for a function
• No more unchecked SQLx queries
• [video] Renaissance of Terminal User Interfaces with Rust — FrOSCon 2024

Rust Walkthroughs

• [video] Build with Naz : Explore Linux TTY, process, signals w/ Rust - Part 3/3 tokio::process::Command

Crate of the Week

This week's crate is cargo-override, a cargo plugin for quick overriding of dependencies.

Thanks to Ajith 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. The following RFCs would benefit from user testing before moving forward:

RFCs

• No calls for testing were issued this week.

Rust

• No calls for testing were issued this week.

Rustup

• No calls for testing were issued this week.

If you are a feature implementer and would like your RFC to appear on the above list, add the new 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.

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 X (formerly Twitter) or Mastodon!

• This Week in Rust - We are recruiting more editors!

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 X (formerly Twitter) or Mastodon!

Updates from the Rust Project

399 pull requests were merged in the last week

• add support for GNU/Hurd on x86_64
• add target support for RTEMS Arm
• impl_trait_overcaptures: Don't worry about uncaptured contravariant lifetimes if they outlive a captured lifetime
• add suggestions for misspelled keywords
• add an internal lint that warns when accessing untracked data
• arbitrary self types v2: pointers feature gate
• autodiff Upstreaming - enzyme backend
• bypass linker configuration and cross target check for specific commands
• check WF of source type's signature on fn pointer cast
• correctly handle stability of #[diagnostic] attributes
• coverage: count await when the Future is immediately ready
• delegation: support generics in associated delegation items
• distribute rustc_codegen_cranelift for Windows
• do not attempt to prove unknowable goals
• do not call query to compute coroutine layout for synthetic body of async closure
• do not request sanitizers for naked functions
• do not skip linker configuration for check builds
• don't suggest labeling const and unsafe blocks
• don't build by-move body when async closure is tainted
• don't emit expect/assume in opt-level=0
• don't store region in CapturedPlace
• fix ICE caused by missing span in a region error
• fix ICE in CMSE type validation
• fix ICE when asm_const and const_refs_to_static are combined
• fix double handling in collect_tokens
• fix enabling wasm-component-ld to match other tools
• fix: get llvm type of global val
• implement raw lifetimes and labels ('r#ident)
• implement suggestions for elided_named_lifetimes
• interpret: make typed copies lossy wrt provenance and padding
• make supertrait and implied predicates queries defaulted
• non-exhaustive structs may be empty
• rename dump of coroutine by-move-body to be more consistent, fix ICE in dump_mir
• s390x: fix a regression related to backchain feature
• suggest impl Trait for References to Bare Trait in Function Header
• supress niches in coroutines to avoid aliasing violations
• use DeepRejectCtxt to quickly reject ParamEnv candidates
• miri: a bit of refactoring in "sync"
• miri: detect when pthread_mutex_t is moved
• miri: detect when pthread_rwlock_t is moved
• miri: enable native libraries on macOS
• miri: fix comment in mutex_id_offset
• miri: renamed variable and fixed comments referring to renamed FileDescriptor
• stabilize -Znext-solver=coherence
• stabilize char::MIN
• stabilize const_float_bits_conv
• stabilize waker_getters
• Fix CVE-2024-43402
• break into the debugger (if attached) on panics (Windows, Linux, macOS, FreeBSD)
• const: make ptr.is_null() stop execution on ambiguity
• make Result::copied unstably const
• str: make as_mut_ptr and as_bytes_mut unstably const
• use the trifecta div algorithm for 128-bit div on wasm
• cargo: resolve: Report MSRV compatible version instead of incomptible
• cargo: new: Add to workspace relative to manifest, not current-dir
• cargo: bail before packaging on same version
• cargo: don't automatically include the current crate when packaging
• cargo: fix cargo add behaving different when translating package name
• cargo: fix parsing of comma separated values in --crate-type flag
• cargo: include public/private dependency status in cargo metadata
• cargo: publish workspace
• cargo: remove unnecessary symbols
• cargo: uplift windows gnullvm import libraries
• rustdoc-search: allow trailing Foo → arg search
• rustdoc: Sort impl associated items by kinds and then by appearance
• rustdoc: add header map to the table of contents
• rustdoc: normalise type/field names
• rustdoc: use strategic boxing to shrink clean::Item
• rustfmt: impl rewrite_result for ForeignItem, TraitAliasBounds, WherePredicate
• rustfmt: impl rewrite_result for ast::Expr
• rustfmt: implement version-sort for imports in style_edition 2024
• bindgen: stabilize --wrap-static-fns
• clippy: single_match, single_match_else: fix suggestion when match irrefutable
• clippy: manual_div_ceil: init
• clippy: add new check for passing pointers to an asm! block with nomem option
• clippy: add new lint manual_is_power_of_two
• clippy: added new non_zero_suggestions lint
• clippy: fix needless_return false negative
• clippy: move manual_c_str_literals to complexity
• clippy: only lint manual_non_exhaustive for exported types
• clippy: visit struct fields recursively in uninit fallback check
• rust-analyzer: IDE support for asm! expressions
• rust-analyzer: better name suggestions for fn
• rust-analyzer: always explicitly set TraitRef self types when lowering
• rust-analyzer: catch panics from diagnostics computation
• rust-analyzer: couple asm! parsing and lowering fixes
• rust-analyzer: don't panic lsp writer thread on dropped receiver
• rust-analyzer: fix lowering of for loops dropping the loop block
• rust-analyzer: properly prevent mir building with unknown types present
• rust-analyzer: updating settings should not clobber discovered projects

Rust Compiler Performance Triage

A relatively quiet week with a majority of regressions coming in rollups which makes investigation more difficult. Luckily the regressions are relatively small and overall the week was a slight improvement in compiler performance.

Triage done by @rylev. Revision range: 6199b69c..263a3aee

Summary:

3 Regressions, 1 Improvement, 2 Mixed; 3 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:

• Merge RFC 3637: Guard patterns

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.

RFCs

• No RFCs entered Final Comment Period this week.

Tracking Issues & PRs

Rust

• [disposition: merge] const-eval interning: accept interior mutable pointers in final value
• [disposition: merge] Stabilize &mut (and *mut) as well as &Cell (and *const Cell) in const
• [disposition: merge] [library/std/src/process.rs] PartialEq for ExitCode
• [disposition: merge] Relate receiver invariantly in method probe for Mode::Path
• [disposition: merge] (Anti-)regression between Rust 1.78.0 and Rust 1.79.0 with struct containing Cow<[Self]>

Cargo

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

Language Team

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

Language Reference

• No Language Reference RFCs entered Final Comment Period this week.

Unsafe Code Guidelines

• No Unsafe Code Guideline Tracking Issues or PRs entered Final Comment Period this week.

New and Updated RFCs

• No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2024-09-11 - 2024-10-09 🦀

Virtual

• 2024-09-10 - 2024-09-13 | Hybrid: Virtual and In-Person (Montreal, QC, CA) | Rust Conf
  • Rust Conf 2024
• 2024-09-12 | Virtual (Berlin, DE) | OpenTechSchool Berlin + Rust Berlin
  • Rust Hack and Learn | Mirror: Rust Hack n Learn Meetup
• 2024-09-12 | Virtual (Rotterdam, NL) | Bevy Game Development
  • Bevy Meetup #6
• 2024-09-12 | Virtual (San Diego, CA, US) | San Diego Rust
  • San Diego Rust September 2024 Tele-Meetup
• 2024-09-16 | Virtual | Women in Rust
  • 👋 Community Catch Up
• 2024-09-17 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2024-09-18 | Virtual and In-Person (Vancouver, BC, CA) | Vancouver Rust
  • Cells
• 2024-09-18 - 2024-09-20 | Hybrid - Virtual and In-Person (Vienna, AT) | Linux Plumbers Conference
  • Rust Microconference in LPC 2024
• 2024-09-19 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
  • Crafting Interpreters in Rust Collaboratively
• 2024-09-19 | Virtual and In-Person (Seattle, WA, US) | Seattle Rust User Group
  • September Meetup
• 2024-09-24 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2024-09-26 | Virtual (Berlin, DE) | OpenTechSchool Berlin + Rust Berlin
  • Rust Hack and Learn | Mirror: Rust Hack n Learn Meetup
• 2024-09-26 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
  • Rusty secure communication on embedded devices
• 2024-10-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2024-10-02 | Virtual (Vancouver, BC, CA) | Vancouver Postgres
  • Leveraging a PL/RUST extension to protect sensitive data in PostgreSQL
• 2024-10-03 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
  • Crafting Interpreters in Rust Collaboratively
• 2024-10-08 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday

Africa

• 2024-10-05 | Kampala, UG | Rust Circle Kampala
  • Rust Circle Meetup

Asia

• 2024-09-14 | Bangalore, IN | Rust Bangalore
  • September 2024 Rustacean meetup
• 2024-09-21 | Bangalore/Bengaluru, IN | Rust Bangalore
  • September 2024 Rustacean meetup

Europe

• 2024-09-11 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup
• 2024-09-17 | Leipzig, DE | Rust - Modern Systems Programming in Leipzig
  • 2D-gamedev mit "bevy"
• 2024-09-17 | Manchester, UK | Rust Manchester
  • Rust Manchester September Code Night
• 2024-09-17 | Trondheim, NO | Rust Trondheim
  • Making AI-models perform tasks, in Rust!
• 2024-09-18 | Moravia, CZ | Rust Moravia
  • Rust Moravia Meetup (September 2024)
• 2024-09-18 | Vienna, AT + Virtual | Linux Plumbers Conference
  • Rust Microconference in LPC 2024 (Sep 18-20)
• 2024-09-21 | Stockholm, SE | Stockholm Rust
  • Ferris' Fika Forum #5
• 2024-09-23 | Bratislava, SK | Bratislava Rust Meetup Group
  • Rust Meetup by Sonalake #6
• 2024-09-24 | Paris, FR | Rust Paris
  • Rust Meetup #70
• 2024-09-24 | Stockholm, SE | Stockholm Rust
  • Rust meetup #70
• 2024-09-26 | Aarhus, DK | Rust Aarhus
  • Talk Night
• 2024-09-26 | Augsburg, DE | Rust Meetup Augsburg
  • Rust Meetup #9: From loops to folds
• 2024-09-26 | Berlin, DE | OpenTechSchool Berlin + Rust Berlin
  • Rust and Tell - Title
• 2024-09-26 | Prague, CZ | Rust Prague
  • Rust Meetup Prague (September 2024)
• 2024-09-27 | Mannheim, DE | Hackerstolz e.V.
  • Hackerstolz Stammtisch Rhein-Neckar
• 2024-10-02 | Oxford, UK | Oxfrod Rust Meetup Group
  • Oxford Rust and C++ social
• 2024-10-02 | Stockholm, SE | Stockholm Rust
  • Rust Meetup @Funnel
• 2024-10-03 | Nürnberg, DE | Rust Nurnberg DE
  • Rust Nürnberg online
• 2024-10-03 | Oslo, NO | Rust Oslo
  • Rust Hack'n'Learn at Kampen Bistro
• 2024-10-09 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup

North America

• 2024-09-11 | Boulder, CO, US | Boulder Rust Meetup
  • Boulder Elixir Meetup
• 2024-09-12 | Chicago, IL, US | Deep Dish Rust
  • Rust Hack Night/Happy Hour
• 2024-09-16 | Cambridge, MA, US | Boston Rust Meetup
  • Somerville Union Square Rust Lunch, Sep 16
• 2024-09-17 | Minneapolis, MN US | Minneapolis Rust Meetup
  • Minneapolis Rust Meetup Happy Hour
• 2024-09-17 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2024-09-18 | Virtual and In-Person (Vancouver, BC, CA) | Vancouver Rust
  • Cells
• 2024-09-19 | Virtual and In-Person (Seattle, WA, US) | Seattle Rust User Group
  • September Meetup
• 2024-09-21 | Longview, TX, US | Longview Code and Coffee
  • Longview Code and Coffee
• 2024-09-24 | Detroit, MI, US | Detroit Rust
  • Rust Community Meetup - Ferndale
• 2024-09-25 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2024-09-26 | Nashville, TN, US | Music City Rust Developers
  • Music City Rust Develpers : Community Presentations
• 2024-09-27 | Cambridge, MA, US | Boston Rust Meetup
  • Beacon Hill Rust Lunch, Sep 27
• 2024-10-03 | St. Louis, MO, US | STL Rust
  • Iterators in Rust
• 2024-10-08 | Detroit, MI, US | Detroit Rust
  • Rust Community Meetup - Ann Arbor

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

Alas! We are once more bereft
of a quote to elate or explain
so this editor merely has left
the option in rhyme to complain.

– llogiq

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, andrewpollack, U007D, kolharsam, joelmarcey, mariannegoldin, bennyvasquez.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust