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 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. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community

Official

• Please welcome The 8472 to the Library team

Foundation

• Secure App Development with Rust's Memory Model

Project/Tooling Updates

• Announcing axum 0.6.0
• Redox OS 0.8.0
• Releasing Yew 0.20
• rust-analyzer changelog #157
• This Week in Fyrox
• Fornjot (code-first CAD in Rust) - Weekly Release
• Unimock 0.4
• Slint 0.3.2 release
• Extism: make all software programmable

Observations/Thoughts

• Rust to assembly: Arrays, Tuples, Box, and Option handling
• Improving async Rust codegen
• rustdoc: Recent UI and UX changes in generated documentation 2
• Rust Foundation in 2023-25
• Follow-up to Foundation post
• WebAssembly: TinyGo vs Rust vs AssemblyScript
• Falsehoods programmers believe about undefined behavior
• [video] Learning Rust the wrong way - Ólafur Waage - NDC TechTown 2022
• [video] OS Development - One Year with Rust - by Bernhard Kauer
• [video] Embedded Rust on ESP32 - Juraj Michálek
• [audio] Leptos with Greg Johnston
• [audio] Kanal with Khashayar Fereidani

Rust Walkthroughs

• Threads and messages with Rust and WebAssembly
• Migrating from warp to axum
• Measuring the overhead of HashMaps in Rust
• Building an API in Rust with Rocket.rs and Diesel.rs (Clean Architecture)
• Avoiding Benchmarking Pitfalls with black_box in Rust
• Embedded Rust & Embassy: UART Serial Communication
• Rust GUI and GTK calc
• Fearless concurrency: multithreaded unzip
• [video] Typesafe Router state with Axum 0.6 release

Miscellaneous

• JetBrains Rust developers survey

Crate of the Week

This week's crate is code-radio-cli, a command line interface for listening to freeCodeCamp's Code Radio music stream.

Thanks to 魏杰 for the suggestion!

Please submit your suggestions and votes for next week!

Call for Participation

Always wanted to contribute to open-source projects but didn't 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.

• pest - RFC: Make white-space handling less confusing / more consistent with the introduction of an "adjacent selector"
• pest - two issues for the pest's website if anyone's into Wasm
• site - migrate from stdweb to wasm-bindgen and websys
• site - integrate a web version of pest_debugger

This week we also have a few non-rust-specific needs from your friends at This Week in Rust! Check them out:

• this-week-in-rust - Add a dark theme
• this-week-in-rust - Add anchors for headers
• this-week-in-rust - Add a search

If you are a Rust project owner and are looking for contributors, please submit tasks here.

Updates from the Rust Project

389 pull requests were merged in the last week

• add powerpc64-ibm-aix as Tier-3 target
• stabilize native library modifier verbatim
• use clang for the UEFI targets
• optimize field ordering by grouping m×2ⁿ-sized fields with equivalently aligned ones
• allow opaque types in trait impl headers and rely on coherence to reject unsound cases
• allow power10-vector feature in PowerPC
• branch Clause from Predicate
• enable fuzzy_provenance_casts lint in liballoc and libstd
• enable profiler in dist-riscv64-linux
• lint: do not warn unused parens around higher-ranked function pointers
• llvm-wrapper adapt for LLVM API change
• make deref_into_dyn_supertrait lint the impl and not the usage
• pass InferCtxt to DropRangeVisitor so we can resolve vars
• pretty-print generators with their generator_kind
• privacy: fix more (potential) issues with effective visibilities
• properly handle Pin<&mut dyn* Trait> receiver in codegen
• resolve: don't use constructor def ids in the map for field names
• separate lifetime ident from lifetime resolution in HIR
• stricter alignment enforcement for ScalarPair and Vector
• suggest .clone() or ref binding on E0382
• miri: fix handling of spurious accesses during retag
• miri: make no_std work on Windows
• miri: track local frames incrementally during execution
• miri: use .wasm extension when building for wasm in cargo-miri
• use an IndexVec to cache queries with index-like key
• fix perf regression by correctly matching keywords
• rustc_metadata: switch module children decoding to an iterator
• codegen_gcc: fix simd_bitmask
• codegen_gcc: fix the argument order for some AVX-512 intrinsics
• don't build compiler_builtins with -C panic=abort
• manually implement PartialEq for Option<T> and specialize non-nullable types
• stop peeling the last iteration of the loop in Vec::resize_with
• constify remaining Layout methods
• mark sys_common::once::generic::Once::new const-stable
• add slice methods for indexing via an array of indices
• futures: stream::size_hint for mpsc channels
• futures: custom Debug implementations for mpsc
• futures: remove Debug constraint for oneshot types
• portable SIMD: avoid a scalar loop in Simd::from_slice
• regex: speed up replacen loop
• rustc_codegen_ssa: write .dwp in a streaming fashion
• cargo: add error message for cargo fix on an empty repo
• cargo: add suggestions when cargo add multiple packages
• cargo: store the sparse+ prefix in the SourceId for sparse registries
• rustdoc: improve popover focus handling JS
• bindgen: add --wrap-unsafe-ops option
• bindgen: add ParseCallbacks::process_comment
• bindgen: deprecate Rust targets lower or equal than 1.30
• bindgen: escape method fragments that happen to be rust keywords
• bindgen: remove traits that have a single implementation
• clippy: add clippy_utils::msrv::Msrv to keep track of the current MSRV
• clippy: add allow-mixed-uninlined-format-args config
• clippy: fix unnecessary_to_owned false positive
• clippy: fix redundant_closure_for_method_calls suggestion
• clippy: fix unnecessary_lazy_eval when type has significant drop
• clippy: lint unnecessary safety comments
• clippy: re-enable uninlined_format_args on multiline format!
• clippy: remove blank lines when needless_return returns no value
• rust-analyzer: add deriveHelper to semanticTokenTypes section of package.json
• rust-analyzer: add assist to generate trait impl's
• rust-analyzer: adds hover hint to ".." in record pattern
• rust-analyzer: check tail expressions more precisely in extract_function
• rust-analyzer: filter unnecessary completions after colon
• rust-analyzer: handle empty checkOnSave/target values
• rust-analyzer: handle sysroot config in detached-files workspaces
• rust-analyzer: tuple to named struct inside macros
• rust-analyzer: hir-expand: fix compile_error! expansion not unquoting strings
• rust-analyzer: improve goto declaration
• rust-analyzer: properly implement Drop for JodGroupChild
• rust-analyzer: suppress "Implement default members" inside contained items
• cargo-bisect-rustc: --start without --end defaults end to be today
• cc-rs: refine CUDA support

Rust Compiler Performance Triage

A relatively quiet week for performance, with the notable exception of "Avoid GenFuture shim when compiling async constructs #104321" which brought sizeable wins on a number of stress test benchmarks. It probably won't be of huge benefit to most codebases, but should provide smaller wins to folks with large amounts of async-generated futures.

Triage done by @simulacrum. Revision range: a78c9bee..8a09420a

3 Regressions, 3 Improvements, 6 Mixed; 2 of them in rollups 43 artifact comparisons made in total

See the full report for details.

Call 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:

• No RFCs issued a call for testing 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.

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

• Restrictions
• Add lang-team advisors 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.

RFCs

• [disposition: merge] RFC: c"…" string literals

Tracking Issues & PRs

• [disposition: merge] Remove const eval limit and implement an exponential backoff lint instead
• [disposition: merge] Windows: make Command prefer non-verbatim paths

New and Updated RFCs

• No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2022-11-30 - 2022-12-28 🦀

Virtual

• 2022-11-30 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Common crates and their usage
• 2022-11-30 | Virtual (Munich, DE) | Rust Munich
  • Rust Munich 2022 / 3 - hybrid
• 2022-12-01 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Exploring USB with Rust
• 2022-12-01 | Virtual (Lehi, UT, US) | Utah Rust
  • Beginner Projects and Shop Talk with Food!
• 2022-12-01 | Virtual (Redmond, WA, US) | Microsoft Reactor Redmond
  • Getting Started with Rust: Understanding Rust Compile Errors – Part 2
• 2022-12-06 | Virtual (Berlin, DE) | Berlin.rs
  • Rust Hack and Learn
• 2022-12-06 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2022-12-07 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2022-12-07 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-12-08 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online #20
• 2022-12-08 | Virtual (San Francisco, CA, US) | Data + AI Online Meetup
  • D3L2: The Genesis of Delta Rust with QP Hou
• 2022-12-10 | Virtual | Rust GameDev
  • Rust GameDev Monthly Meetup
• 2022-12-13 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday
• 2022-12-13 | Virtual (Rostock, DE) | Altow Academy
  • Rust Meetup Rostock
• 2022-12-13 | Virtual (Saarbrücken, DE) | Rust-Saar
  • Meetup: 25u16
• 2022-12-14 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust
  • Monthly Meetup
• 2022-12-14 | Virtual (México City, MX) | Rust MX
  • Rust y Arduino
• 2022-12-15 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-12-20 | Virtual (Berlin, DE) | Berlin.rs
  • Rust Hack and Learn
• 2022-12-20 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2022-12-21 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2022-12-27 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday

Europe

• 2022-11-30 | Amsterdam, NL | Rust Nederland
  • Rust in Critical Infrastructure
• 2022-11-30 | Lille, FR | Rust Lille
  • Rust Lille #1
• 2022-11-30 | Milan, IT | Rust Language Milano
  • Welcome GAT!!
• 2022-11-30 | Munich, DE + Virtual | Rust Munich
  • Rust Munich 2022 / 3 - hybrid
• 2022-11-30 | Paris, FR | Rust Paris
  • Rust Paris meetup #54
• 2022-12-01 | Edinburgh, UK | Rust Edinburgh
  • December Talks + Rust Book Raffle
• 2022-12-01 | Wrocław, PL | Rust Wrocław
  • Rust Wrocław Meetup #30
• 2022-12-06 | London, UK | Rust London User Group
  • Go X Rust: A Very Scalable Christmas Party
• 2022-12-07 | Zurich, CH | Rust Zurich
  • Next generation i18n with rust (icu4x) and zero-copy deserialization
• 2022-12-12 | Enschede, NL | Dutch Rust Meetup
  • Rust Meetup - Subject TBA
• 2022-12-15 | Stuttgart, DE | Rust Community Stuttgart
  • OnSite Meeting

North America

• 2022-12-01 | Lehi, UT, US + Virtual | Utah Rust
  • Beginner Projects and Shop Talk with Food!
• 2022-12-08 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting
• 2022-12-20 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person

Oceania

• 2022-12-09 | Melbourne, VIC, AU | Rust Melbourne
  • December 2022 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

After many years of writing bugs, and then discovering Rust, I learned to appreciate explicitness in code, and hope you eventually will too.

– Artem Borisovskiy on rust-users

Thanks to Árpád Goretity for the suggestion!

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