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

Official

• Announcing the Rust Style Team

Foundation

• Rust Foundation Project Grants are open for applications

Project/Tooling Updates

• cargo careful: run your Rust code with extra careful debug checking
• Async UI: a Rust UI Library where Everything is a Future
• rust-analyzer changelog #149

Observations/Thoughts

• How (and why) nextest uses tokio, part 1
• in-place constructors
• Quirks of Rust’s token representation
• Brute forcing protected ZIP archives in Rust
• This week in Fluvio #47: The programmable streaming platform

Rust Walkthroughs

• How to call a C function from Rust (A simple FFI tutorial)
• Rewriting the Modern Web in Rust
• Implementing truly safe semaphores in rust
• Model an ALU in Rust
• 6 things you can do with the Cow 🐄 in Rust 🦀
• Platform Agnostic Drivers in Rust: MAX7219 Naive Code Refactoring
• Last mile DynamoDB: Deno Deploy edition

Miscellaneous

• The Initial Rust Infrastructure Has Been Merged Into Linux 6.1

Crate of the Week

This week's crate is humansize, a size formatting crate. Now in version 2.0, with an updated API.

Thanks, Leopold Arkham 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.

• AeroRust website - Add an aerospace related crate #Hacktoberfest
• nmea - Supporting additional sentences #Hacktoberfest
• AeroRust website - Request for content
• zerocopy - test_new_error fails on i686
• zerocopy - test_as_bytes_methods fails on powerpc
• zerocopy - Miri can't run tests for wasm32-wasi target
• Ockam - Prototype UDP NAT hole punching
• Ockam - Refactor ockam secure-channel listener create command to use rpc
• Ockam - Split CBOR / Messaging API schema.cddl

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

Updates from the Rust Project

367 pull requests were merged in the last week

• libc: add major/minor/makedev on apple OSes
• miri: Add flag to specify the number of cpus
• cargo: Iteratively construct target cfg
• rustdoc-Json: List impls for primitives
• clippy: Implement manual_clamp lint
• clippy: Silence [question_mark] in const context
• clippy: [manual_assert]: Preserve comments in the suggestion
• clippy: [unnecessary_lazy_evaluations] Do not suggest switching to early evaluation when type has custom Drop
• clippy: add box-default lint
• clippy: fix [needless_borrow], [explicit_auto_deref] FPs on unions
• clippy: let upper_case_acronyms check the enum name
• clippy: let unnecessary_cast work for trivial non_literal expressions
• clippy: lint nested patterns and slice patterns in needless_borrowed_reference
• clippy: new implicit_saturating_add lint
• rust-analyzer: Add proc-macro dependency to rustc crates
• rust-analyzer: Fix PackageInformation having the crate name instead of package name
• rust-analyzer: Fix annotations not resolving when lens location is set to whole item
• rust-analyzer: Fix find_path using the wrong module for visibility calculations
• rust-analyzer: Fix move_format_string_arg being tokentree unaware
• rust-analyzer: Fix requests not being retried anymore
• rust-analyzer: Fix trait impl item completions using macro file text ranges
• rust-analyzer: Fix type alias hovers not rendering generic parameters
• rust-analyzer: Use cfg(any()) instead of cfg(FALSE) for disabling proc-macro test
• ci: Replace volta-cli/action with builtin functionality from actions/setup-node
• docs.rs: new cache-policy & cache middleware structure to support full page caching
• add #[rustc_safe_intrinsic]
• add a niche to Duration, unix SystemTime, and non-apple Instant
• add diagnostic struct for const eval error in rustc_middle
• add negation methods for signed non-zero integers
• added more const_closure functionality
• adjust the s390x data layout for LLVM 16
• compute lint levels by definition
• fix #[derive(Default)] on a generic #[default] enum adding unnecessary Default bounds
• fix format_args capture for macro expanded format strings
• fix associated type bindings with anon const in GAT position
• fix integer overflow in format!("{:.0?}", Duration::MAX)
• generate synthetic region from impl even in closure body within an associated fn
• get rid of exclude-list for Windows-only tests
• serialize return-position impl Trait in trait hidden values in foreign libraries
• stabilize #![feature(mixed_integer_ops)]
• stabilize bench_black_box
• use let-chaining in WhileTrue::check_expr
• introduce {char, u8}::is_ascii_octdigit
• macros: diagnostic derive on enums
• add a filter for try commits in graphs, compare page and triage
• codegen_gcc: Implement llvm.prefetch
• codegen_gcc: simd: enable simd_as intrinsic
• codegen_gcc: simd: implement float math intrinsics
• allow users to debug their processes

Rust Compiler Performance Triage

A great week, with 170 primary benchmark scenarios seeing improvement. Every PR flagged by perf provided at least some wins, and perhaps more impressive: No rollup PR's were flagged by perf this week! Furthermore, cjgillot fixed an issue where incremental compilation was being unnecessarily hindered by our span and lint system. Great work everyone!

Triage done by @pnkfelix. Revision range: d9297d22..02cd79af

Full report here

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

• [disposition: merge] make const_err a hard error
• [disposition: merge] Elaborate supertrait bounds when triggering unused_must_use on impl Trait
• [disposition: merge] Stabilize proc_macro Span::source_text
• [disposition: merge] const-stablilize NonNull::as_ref
• [disposition: merge] Add documentation about the memory layout of UnsafeCell<T>
• [disposition: merge] Handle projections as uncovered types during coherence check
• [disposition: merge] Never panic in thread::park and thread::park_timeout
• [disposition: merge] Stabilize nonzero_bits
• [disposition: merge] EscapeAscii is not an ExactSizeIterator
• [disposition: merge] Change default level of INVALID_HTML_TAGS to warning and stabilize it
• [disposition: merge] Add Box<[T; N]>: TryFrom<Vec<T>>
• [disposition: merge] add no_compile doctest attribute

New and Updated RFCs

• No New or Updated RFCs were created this week.

Upcoming Events

Rusty Events between 2022-10-05 - 2022-11-02 🦀

Virtual

• 2022-10-05 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2022-10-05 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-10-06 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online #18
• 2022-10-08 | Virtual | Rust GameDev
  • Rust GameDev Monthly Meetup
• 2022-10-11 | Virtual (Berlin, DE) | Open TechSchool Berlin
  • Rust Hack and Learn
• 2022-10-11 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday
• 2022-10-11 | Virtual (Saarbrücken, DE) | Rust-Saar
  • Meetup: 23u16
• 2022-10-11 | Virtual (Weiden, DE) | Digital Craftsmanship Nordoberpfalz
  • Woher kommt der Hype? Rust in 45 Minuten
• 2022-10-12 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust
  • Monthly Meetup
• 2022-10-12 | Virtual (Erlangen, DE) | Rust Franken
  • Rust Franken Meetup #4
• 2022-10-12 | Virtual (San Francisco, CA, US / Redmond, WA, US / London, UK) | Microsoft Reactor San Francisco
  • Getting Started with Rust: Building Rust Projects | Redmond Reactor Mirror Event | London Reactor Mirror Event
• 2022-10-13 | Virtual (Berlin, DE) | EuroRust
  • EuroRust (Oct 13-14)
• 2022-10-15 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Deep Dive Session 2 (CuteCopter): Reverse Engineering a tiny drone
• 2022-10-18 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful—Impractical Rust: The HATETRIS World Record
• 2022-10-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rapid Prototyping in Rust: Write fast like Python; Run fast like C
• 2022-10-20 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-10-25 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2022-10-26 | Virtual (Redmond, WA, US) | Microsoft Reactor Redmond
  • Your First Rust Project: Rust Basics
• 2022-10-27 | Virtual (Charlottesville, VA, US) | Charlottesville Rust Meetup
  • Using Applicative Functors to parse command line options
• 2022-11-01 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 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) | Microsoft Reactor Redmond
  • Getting Started with Rust: From Java Dev to Rust Developer | San Francisco Reactor Mirror Event | London Reactor Mirror Event

Asia

• 2022-10-11 | Tokyo, JP | Tokyo Rust Meetup
  • Cost-Efficient Rust in Practice

Europe

• 2022-10-06 | Wrocław, PL | Rust Wrocław
  • Rust Wrocław Meetup #29
• 2022-10-12 | Berlin, DE | Rust Berlin
  • Rust and Tell - EuroRust B-Sides
• 2022-10-13 | Berlin, DE + Virtual | EuroRust
  • EuroRust (Oct 13-14)
• 2022-10-25 | Paris, FR | Rust Paris
  • Rust Paris meetup #53

North America

• 2022-10-13 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting
• 2022-10-18 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 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!

Oceania

• 2022-10-10 | Sydney, NSW, AU | Rust Sydney
  • Rust Lightning Talks
• 2022-10-20 | Wellington, NZ + Virtual | Rust Wellington
  • Tune Up Edition: software engineering management

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

BurntSushi is a super experienced programmer who always seems to know what’s right

Shepmaster occasionally pops up to keep things level, and provides definitive answers and edits to all stackoverflow questions

Epage is the ecosystem guy thanklessly maintaining the things that make the magic of cargo possible

Dtolnay is an AI written in rust with the sole purpose of improving rust.

– trevg_123 on r/rust

Thanks to musicmatze 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