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 Rust 1.65.0

Project/Tooling Updates

• rust-analyzer changelog #154
• IntelliJ Rust Changelog #182
• This Month in Rust OSDev: October 2022 | Rust OSDev
• This Week in Fyrox
• Cap'n Proto - Generic Associated Types
• Gitoxide - Cloning the Linux kernel in under a minute
• This week in Fluvio #48: The programmable streaming platform

Observations/Thoughts

• Scoped threads in Rust, and why its async counterpart would be unsound
• 34 Must Know Terms for Embedded Rust Newbies
• what if pointer properties were in the rust type system
• mmap(1Tb): A Rust arena allocator (ab)using Linux overcommit
• Contributing to Rust: Bootstrapping the Rust Compiler (rustc)
• The ‘Viral’ Secure Programming Language That’s Taking Over Tech
• [FR] Rust par le Métal : move, clone, copy (series)
• [FR] Rust par le Métal (Annexe) : Les bases de nombres (series)

Rust Walkthroughs

• Tauri vs. Electron for Tray Apps
• Running Rust in AWS Lambda with SAM — Part 1
• Tower, Episode 2: calling a Tower Service
• Writing an eBPF/XDP Load-Balancer in Rust
• Floating Point Arcade
• [video] Cost-Efficient Rust in Practice, Rust Tokyo

Research

• Can Rust-wrapped C++ offer performance and stability benefits?

Miscellaneous

• Lynx Joins AdaCore and Ferrous Systems to Bring Rust to Embedded Developers
• [video] RUST 1.65 - let-else statements - new language feature!!!
• [video] The Rust Programming Language for Game Tooling
• [video] Bencher—Catch Performance Regressions in CI @ Rust DC, September 20, 2022 w/ Everett Pompeii
• [video] Impractical Rust: The HATETRIS World Record @ Rust DC, October 18, 2022 w/Dave Freiberg+Felipe Suero
• [DE] Programmiersprache Rust 1.65 führt Generic Associated Types ein
• [DE] Ferris Talk #12: Web-APIs mit Rust erstellen

Crate of the Week

This week's crate is enum_delegate, a crate to replace dynamic dispatch with enum dispatch.

Thanks to Devin Brite 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.

FOSDEM 2023 Rust devroom CFP

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

Updates from the Rust Project

396 pull requests were merged in the last week

• (almost) always use ObligationCtxt when dealing with canonical queries
• fix(generic_const_exprs):fix predicate inheritance for children of opaque types
• make cpp-like debuginfo type names for slices and str consistent
• track where diagnostics were created
• rustc_metadata: encode even less doc comments
• add multivalue target feature to WASM target
• allow use of -Clto=thin with -Ccodegen-units=1 in general
• lint against usages of struct_span_lint_hir
• stable Lower lint level for read_zero_byte_vec
• reduce span of let else irrefutable_let_patterns warning
• suggest use .. to fill in the rest of the struct fields
• better error for rustc_strict_coherence misuse
• correctly resolve Inherent Associated Types
• don't silently eat label before block in block-like expr
• interpret: fix align_of_val on packed types
• make proc_macro_derive_resolution_fallback a hard error
• make underscore_literal_suffix a hard error
• normalize types when deducing closure signature from supertraits
• miri: implement condvars for Windows
• miri: initOnce: synchronize with completion when already complete
• rewrite implementation of #[alloc_error_handler]
• remove bounds check when array is indexed by enum
• stabilize the instruction_set feature
• implement std::marker::Tuple, use it in extern "rust-call" and Fn-family traits
• futures: do not require Clone for Shared::peek
• libtest: run all tests in their own thread, if supported by the host
• rustdoc: fix merge of attributes for reexports of local items
• rustdoc: make Item::visibility computed on-demand
• bindgen: add support for the "C-unwind" ABI
• bindgen: add the --override-abi option
• bindgen: allow callback composition
• bindgen: wrap unsafe function's bodies in unsafe blocks
• clippy: add allow-print-in-tests config
• clippy: add new lint let_underscore_future
• clippy: extend needless_collect
• clippy: fix ICE in redundant_allocation
• clippy: fix unnecessary_join turbofish in suggest message
• clippy: improve needless_lifetimes
• clippy: move needless_collect to nursery
• clippy: shrink missing_{safety, errors, panics}_doc spans
• rust-analyzer: add "Convert match to let-else" assist
• rust-analyzer: add config for inserting must_use in generate_enum_as_method
• rust-analyzer: extracted method from trait impl is placed in existing impl
• rust-analyzer: generalize reborrow hints as adjustment hints
• rust-analyzer: show signature help when calling generic types implementing FnOnce
• rust-analyzer: fix the length displayed for byte string literals with escaped newlines
• rust-analyzer: async trait method for unnecessary_async
• rust-analyzer: fix reference searching only accounting substrings instead of whole identifiers
• rust-analyzer: make custom expr prefix completions to understand refs
• rust-analyzer: fixed local shadowing the caller's argument issue
• rust-analyzer: lower unsafety of fn pointer and fn item types
• rust-analyzer: migrate assists to format args captures, part 3
• rust-analyzer: scip: generate symbols for local crates

Rust Compiler Performance Triage

A relatively noisy week (most of those have been dropped below, and comments left on GitHub), but otherwise a quiet one in terms of performance changes, with essentially no significant changes occuring.

Triage done by @simulacrum. Revision range: 822f8c2..57d3c58

2 Regressions, 2 Improvements, 3 Mixed; 3 of them in rollups 39 artifact comparisons made in total

See the full report for more 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:

• crates.io token scopes

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: close] RFC 3283: Backward compatible default features
• [disposition: close] RFC: Rust SemVer 2
• [disposition: postpone] Add named path bases to cargo

Tracking Issues & PRs

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

New and Updated RFCs

• [new] Create an Operational Semantics Team
• [new] Add a --compile-time-deps build flag to cargo build
• [new] RFC: Anonymous Associated Types

Upcoming Events

Rusty Events between 2022-11-09 - 2022-12-07 🦀

Virtual

• 2022-11-09 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Introduction to Rust Atomics
• 2022-11-09 | Virtual (Darmstadt, DE) | betterCode
  • betterCode Rust
• 2022-11-09 | Virtual (Malaysia, MY) | Rust Malaysia
  • Rust Meetup November 2022 - a couple of lightning talks
• 2022-11-10 | Virtual (Budapest, HU) | HWSW free!
  • RUST! RUST! RUST! meetup (online formában!)
• 2022-11-10 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online #19
• 2022-11-12 | Virtual | Rust GameDev
  • Rust GameDev Monthly Meetup
• 2022-11-15 | Virtual (Nairobi, KE / New York, NY, US)| Data Umbrella Africa
  • Online: Introduction to Rust Programming | New York Mirror
• 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
• 2022-11-17 | Virtual (Amsterdam, NL) | ITGilde Tech-Talks
  • Introduction “Rust” an ITGilde Tech Talk delivered by Pascal van Dam
• 2022-11-17 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-11-21 | Virtual (Paris, FR) | Meetup Paris - École Supérieure de Génie Informatique (ESGI)
  • Découverte de WebAssembly
• 2022-11-22 | Virtual (Berlin, DE) | Berlin.rs
  • Rust Hack and Learn
• 2022-11-24 | Virtual (Linz, AT) | Rust Linz
  • Rust Meetup Linz - 27th Edition
• 2022-11-29 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 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
• 2022-12-06 | 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

Europe

• 2022-11-15 | Tampere, FI | Rust Finland
  • Rust Meetup in Tampere
• 2022-11-16 | Paris, FR | Stockly
  • Rust Meetup in Paris - hosted by Stockly
• 2022-11-23 | Bratislava, SK | Bratislava Rust Meetup Group
  • Initial Meet and Greet Rust meetup
• 2022-11-24 | København, DK | Copenhagen Rust Group
  • Hack Night #31
• 2022-11-30 | Amsterdam, NL | Rust Nederland
  • Rust in Critical Infrastructure
• 2022-11-30 | Lille, FR | Rust Lille
  • Rust Lille #1
• 2022-11-30 | Munich, DE + Virtual | Rust Munich
  • Rust Munich 2022 / 3 - hybrid

North America

• 2022-11-10 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting
• 2022-11-15 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2022-11-29 | Austin, TX, US | ATX Rustaceans
  • Atx Rustaceans Meetup
• 2022-12-01 | Lehi, UT, US | Utah Rust
  • Utah Rust meetup

Oceania

• 2022-11-09 | Sydney, NSW, AU | Rust Sydney
  • RustAU Sydney - Last physical for 2022 !
• 2022-11-22 | Canberra, ACT, AU | Canberra Rust User Group
  • November 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

Meanwhile the Rust shop has covers on everything and tag-out to even change settings of the multi-axis laser cutter, but you get trusted with said laser cutter on your first day, and if someone gets hurt people wonder how to make the shop safer.

– masklinn on r/rust

Thanks to Anton Fetisov 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