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? Tweet us at @ThisWeekInRust 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

Newsletters

• This Month in Rust GameDev #38 - September 2022

Project/Tooling Updates

• Progress report on rustc_codegen_cranelift (Okt 2022)
• Announcing KataOS and Sparrow
• rust-analyzer changelog #151
• A Memory Safe Implementation of the Network Time Protocol
• Zenoh 0.6.0, a Pub/Sub/Query protocol, was released and it is packed with new features.
• GlueSQL v0.13 - FSM based SQL query builder is newly added
• Rust on Espressif chips - 17-10-2022
• Introducing BastionAI, an open-source privacy-friendly AI training framework in Rust

Observations/Thoughts

• Platform Agnostic Drivers in Rust: Publishing to Crates.io
• A first look at Rust in the 6.1 kernel
• Asynchronous programming in Rust
• Why Rust?
• What If LaTeX Had Instant Preview?
• Magical handler functions in Rust

Rust Walkthroughs

• Rust: Type Concealment With Any Trait and FnMut
• Practical Parsing in Rust with nom
• The Little Joys of Code: Proc Macros
• How to Build a Machine Learning Model in Rust
• [video] Building Awesome Desktop App with Rust, Tauri, and SurrealDB
• [video] AsRef/Borrow Traits, and the ?Sized Marker - Rust
• Using Neovim for Rust Development
• [series] Sqlite File Parser Pt 3

Research

• Simulating C++ references in Rust

Crate of the Week

This week's crate is HyperQueue, a runtime for ergonomic execution of programs on a distributed cluster.

Thanks to Jakub Beránek for the self-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.

• zerocopy - Add defensive programming in FromBytes::new_box_slice_zeroed
• zerocopy - Add tests for compilation failure
• Fornjot - export-validator does not support Windows
• Ockam - Add clap based ockam sub command to create a vault without creating a node
• Ockam - Add clap based ockam sub command to rotate identity keys
• Ockam - Partition rust test jobs with nextest

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

Updates from the Rust Project

388 pull requests were merged in the last week

• support casting boxes to dyn*
• support default-body trait functions with return-position impl Trait in traits
• mark derived StructuralEq as automatically derived
• allow compiling the wasm32-wasi std library with atomics
• detect and reject out-of-range integers in format string literals
• drop temporaries created in a condition, even if it's a let chain
• fix let keyword removal suggestion in structs
• make dyn* casts into a coercion, allow dyn* upcasting
• make overlapping_impls not generic
• point out incompatible closure bounds
• populate effective visibilities in rustc_resolve
• print return-position impl Trait in trait verbosely if -Zverbose
• add suggestion to the "missing native library" error
• suggest == to the first expr which has ExprKind::Assign kind
• suggest candidates for unresolved import
• suggest parentheses for possible range method calling
• suppress irrefutable let patterns lint for prefixes in match guards
• unify tcx.constness query and param env constness checks
• remove type traversal for mir constants
• scoped threads: pass closure through MaybeUninit to avoid invalid dangling references
• never panic in thread::park and thread::park_timeout
• use semaphores for thread parking on Apple platforms
• nicer errors from assert_unsafe_precondition
• optimize TLS on Windows
• stabilize map_first_last
• constify Location methods
• add MaybeUninit array transpose From impls
• add Box<[T; N]>: TryFrom<Vec<T>>
• add IsTerminal trait to determine if a descriptor or handle is a terminal
• add is_empty() method to core::ffi::CStr
• panic for invalid arguments of {integer primitive}::ilog{,2,10} in all modes
• impl AsFd and AsRawFd for io::{Stdin, Stdout, Stderr}, not the sys versions
• prevent UB in child process after calling libc::fork
• fix Duration::{try_,}from_secs_f{32,64}(-0.0)
• SIMD: mark more mask functions inline
• futures: fix soundness hole in join macros
• cargo: fix deadlock when build scripts are waiting for input on stdin
• cargo: support 'publish.timeout' config behind '-Zpublish-timeout'
• rustdoc: change default level of invalid_html_tags to warning and stabilize it
• clippy: add as_ptr_cast_mut lint
• clippy: add unused_format_specs lint
• clippy: add a suggestion and a note about orphan rules for from_over_into
• clippy: add new lint partial_pub_fields
• clippy: change uninlined_format_args into a style lint
• clippy: don't lint ptr_arg when used as an incompatible trait object
• clippy: fix to_string_in_format_args in parens
• clippy: don't lint default_numeric_fallback on constants
• clippy: don't lint unnecessary_cast on negative hexadecimal literals when cast as floats
• clippy: zero_prefixed_literal: Do not advise to use octal form if not possible
• clippy: add cast-nan-to-int lint
• clippy: fix box-default linting no_std non-boxes
• clippy: fix: uninlined_format_args shouldn't inline panic! before 2021 edition
• rust-analyzer: migrate assists to format args captures, part 2
• rust-analyzer: diagnose some incorrect usages of the question mark operator
• rust-analyzer: fix formatting requests hanging when r-a is still starting

Rust Compiler Performance Triage

Overall a fairly busy week, with many improvements and regressions, though the net result ends up being a small regression. Pretty busy week in terms of regressions in rollups as well, which unfortunately mostly were not followed up on prior to the report being put together, despite the relative ease of running perf against individual PRs now.

Triage done by @simulacrum. Revision range: 1e926f06..e0f8e60

2 Regressions, 4 Improvements, 4 Mixed; 4 of them in rollups 47 artifact comparisons made in total

See 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:

• 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.

RFCs

• No RFCs entered Final Comment Period this week.

Tracking Issues & PRs

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

New and Updated RFCs

• [new] Add RFC for calling default trait methods
• [new] Add lang-team advisors team

Upcoming Events

Rusty Events between 2022-10-19 - 2022-11-16 🦀

Virtual

• 2022-10-19 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust
  • Monthly Meetup
• 2022-10-19 | Virtual (Chennai, IN) | Techceleration at Toyota Connected
  • Techceleration's! Let's Talk Tech! Rust | BreakTheCode Contest - 14th Edition
• 2022-10-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rapid Prototyping in Rust: Write fast like Python; Run fast like C
• 2022-10-19 | Virtual | Boston NoSQL Database Group (ScyllaDB)
  • p99 Conf: All Things Performance (including talks on Rust) - Free | Official conference page
• 2022-10-20 | Virtual (Bellingham, WA, US) | bellingham.codes
  • Software Forum 8 (with Language small groups: Rust)
• 2022-10-20 | Virtual (Buenos Aires, AR) | Nerdearla
  • Rust y el desarrollo de software en la próxima década
• 2022-10-20 | Virtual (México City, MX) | Rust MX
  • Graphul, un web framework escrito en Rust
• 2022-10-20 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-10-25 | Virtual (Berlin, DE) | OpenTechSchool Berlin
  • Rust Hack and Learn
• 2022-10-25 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2022-10-26 | Virtual (Redmond, WA, US / New York, NY, US / Toronto, CA / Stockholm, SE / London, UK) | Microsoft Reactor Redmond
  • Your First Rust Project: Rust Basics | New York Mirror | Toronto Mirror | Stockholm Mirror | London Mirror
• 2022-10-27 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Using Applicative Functors to parse command line options
• 2022-10-27 | Virtual (Karlsruhe, DE) | The Karlsruhe Functional Programmers Meetup Group
  • Stammtisch (gemeinsam mit der C++ UG KA) (various topics, from C++ to Rust...)
• 2022-10-29 | Virtual (Ludwigslust, DE) | Ludwigslust Rust Meetup
  • Von Nullen und Einsen | Rust Meetup Ludwigslust #1
• 2022-11-01 | Virtual (Beijing, CN) | WebAssembly and Rust Meetup (Rustlang)
  • Monthly WasmEdge Community Meeting, a CNCF sandbox WebAssembly runtime
• 2022-11-01 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2022-11-02 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Rust and C++ Cardiff Virtual Meet
• 2022-11-02 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2022-11-02 | Virtual (Redmond, WA, US / San Francisco, SF, US / New York, NY, US / Toronto, CA / London, UK) | Microsoft Reactor Redmond
  • Getting Started with Rust: From Java Dev to Rust Developer | San Francisco Mirror | New York Mirror | Toronto Mirror | London Mirror
• 2022-11-02 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-11-08 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday
• 2022-11-08 | Virtual (Stockholm, SE) | Func Prog Sweden
  • Tenth Func Prog Sweden MeetUp 2022 – Online (with "Ready for Rust" by Erik Dörnenburg)
• 2022-11-10 | Virtual (Budapest, HU) | HWSW free!
  • RUST! RUST! RUST! meetup (online formában!)
• 2022-11-12 | Virtual | Rust GameDev
  • Rust GameDev Monthly Meetup
• 2022-11-15 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2022-11-16 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out

Europe

• 2022-10-20 | London, UK | Rust London User Group
  • Rust London x JFrog SwampUP After Party
• 2022-10-25 | Paris, FR | Rust Paris
  • Rust Paris meetup #53
• 2022-10-25 | Roma, IT | Rust Roma
  • Meetup Golang Roma - Go + Rust Hacknight - Hacktoberfest 2022
• 2022-10-26 | London, UK | Rust London User Group
  • LDN Talks October 2022: Host by Amazon Prime Video
• 2022-10-26 | Bristol, UK | Rust and C++ Cardiff/Rust Bristol
  • Programming Veloren & Rust for a living
• 2022-10-27 | København, DK | Copenhagen Rust Group
  • Hack Night #30

North America

• 2022-10-20 | New York, NY, US | Rust NYC
  • Anyhow ? Turbofish ::<> / HTTP calls and errors in Rust.
• 2022-10-20 | New York, NY, US | Cloud Native New York
  • Cloud-native Search Engine for Log Management and Analytics.
• 2022-10-25 | Toronto, ON, CA | Rust Toronto
  • Rust DHCP
• 2022-10-27 | Lehi, UT, US | Utah Rust
  • Bevy Crash Course with Nathan and Food!
• 2022-11-10 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting

Oceania

• 2022-10-20 | Brisbane, QLD, AU | Rust Brisbane
  • October Meetup
• 2022-10-20 | Wellington, NZ | Rust Wellington
  • Tune Up Edition: software engineering management
• 2022-10-25 | Melbourne, VIC, AU | Rust Melbourne
  • October 2022 Meetup
• 2022-11-09 | Sydney, NSW, AU | Rust Sydney
  • RustAU Sydney - Last physical for 2022 !

South America

• 2022-11-05 | São Paulo, SP, BR | Rust São Paulo Meetup
  • Rust-SP meetup Outubro 2022

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 think it's worth noting that the fact that this program fails to compile whereas the analogous Python runs but gives the wrong answer is exactly what Rust's ownership and borrowing system is about.

– Kevin Reid on rust-users

Thanks to Kill The Mule 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