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 1.64.0 | Rust Blog

Newsletters

• This Month in Rust GameDev #37 - August 2022

Project/Tooling Updates

• rust-analyzer - changelog #148
• IntelliJ Rust Changelog #179
• Announcing async-dns
• Fornjot - Weekly Release - 2022-W39
• gitoxide - August: Useful rev-spec parsing and an abstraction for remotes
• Getting Started with Seaography - A GraphQL framework for SeaORM

Observations/Thoughts

• Internship Projects 2022: Concrete Playback
• Why Volvo thinks you should have Rust in your car
• Linux embracing Rust will boost robotics community
• Better Java logging, inspired by Clojure and Rust
• Why Async Rust
• Apache APISIX loves Rust! (and me too)
• Safe pinned initialization
• Enabling Rapid Pulumi Prototyping with Rust
• STM32F4 Embedded Rust at the HAL: SPI with the MAX7219 LED Dot Matrix
• [audio] Rustacean Station: Ockam with Mrinal Wadhwa

Rust Walkthroughs

• Building a Real-Time Web Cipher with Rust, Sycamore and Trunk
• Dyn async traits, part 9: call-site selection
• Rust 2024...the year of everywhere?
• Building Nix flakes from Rust workspaces
• Accessing Firebird With Diesel and Rust
• Multithreading in Rust
• Flutter and Rust combined

Miscellaneous

• [DE] CTO von MS Azure: Nehmt Rust für neue Projekte und erklärt C/C++ für überholt!
• [DE] Rust Foundation erhält 460.000 US-Dollar und gründet ein Team für Security
• [DE] Programmiersprache Rust 1.64 erweitert asynchrone Programmierung mit IntoFuture
• [video] Rust & Wasm (Safe and fast web development)
• [video] Crust of Rust: Build Scripts and Foreign-Function Interfaces (FFI)
• [video] Bevy Basics Reflect

Crate of the Week

This week's crate is serde-transcode, a crate to efficiently convert between various serde-supporting formats

Thanks to Kornel 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.

• zerocopy - Test more conditions in GitHub actions
• pw-sys - help with CI for one of diesel's dependencies
• Ockam - Improve CowStr Display
• Ockam - https://github.com/build-trust/ockam/issues/3507
• Ockam - Refactor NodeManager constructor

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

Updates from the Rust Project

347 pull requests were merged in the last week

• add armv5te-none-eabi and thumbv5te-none-eabi targets
• compiler-builtins: enable floating point intrinsics for RISCV32 microcontrollers
• rustc_transmute: fix big-endian discriminants
• allow ~const bounds on non-const functions
• allow specializing on const trait bounds
• recover from struct nested in struct
• recover some items that expect braces and don't take semicolons
• make cycle errors recoverable
• avoid panicking on missing fallback
• require #[const_trait] on Trait for impl const Trait
• resolve async fn signature even without body (e.g., in trait)
• diagnostics: avoid syntactically invalid suggestion in if conditionals
• add help for invalid inline argument
• suggest Default::default() when binding isn't initialized
• improve error for when query is unsupported by crate
• improve the help message for an invalid calling convention
• look at move place's type when suggesting mutable reborrow
• note if mismatched types have a similar name
• note the type when unable to drop values in compile time
• miri: don't back up past the caller when looking for an FnEntry span
• interpret: expose generate_stacktrace without full InterpCx
• inline SyntaxContext in both encoded span representation
• introduce mir::Unevaluated
• only generate closure def id for async fns with body
• use function pointers instead of macro-unrolled loops in rustc_query_impl
• separate definitions and HIR owners in the type system
• use partition_point instead of binary_search when looking up source lines
• skip Equate relation in handle_opaque_type
• calculate ProjectionTy::trait_def_id for return-position impl Trait in trait correctly
• manually cleanup token stream when macro expansion aborts
• neither require nor imply lifetime bounds on opaque type for well formedness
• normalize closure signature after construction
• normalize opaques with bound vars
• split out async_fn_in_trait into a separate feature
• support overriding initial rustc and cargo paths
• use internal iteration in Iterator comparison methods
• alloc: add unstable cfg features no_rc and no_sync
• a fn pointer doesn't implement Fn/FnMut/FnOnce if its return type isn't sized
• fix ConstProp handling of written_only_inside_own_block_locals
• implied_bounds: deal with inference vars
• make Condvar, Mutex, RwLock const constructors work with the unsupported impl
• make projection bounds with const bounds satisfy const
• resolve: set effective visibilities for imports more precisely
• add option to deduplicate extern blocks
• codegen: implement manuallydrop fields better
• optimize array::IntoIter
• std: use sync::RwLock for internal statics
• stabilize const BTree{Map,Set}::new
• constify Default impl's for Arrays and Tuples
• constify cmp_min_max_by
• constify slice.split_at_mut(_unchecked)
• add const_closure, constify Try trait
• make ManuallyDrop satisfy ~const Destruct
• make from_waker, waker and from_raw unstably const
• extend const_convert with const {FromResidual, Try} for ControlFlow
• recover error strings on Unix from_lossy_utf8
• cargo: add support for relative git submodule paths
• cargo: improve errors for TOML fields that support workspace inheritance
• cargo: report cmd aliasing failure with more contexts
• cargo: error trailing args rather than ignore
• cargo: forward non-UTF8 arguments to external subcommands
• cargo: make unknown features on cargo add more discoverable
• rustdoc: stabilize --diagnostic-width
• bindgen: handle no_return attributes
• bindgen: remove file added by mistake
• clippy: add matches! checking to nonstandard_macro_braces
• clippy: fix ICE in needless_pass_by_value with unsized dyn Fn
• clippy: fix ICE in unnecessary_to_owned
• clippy: fix panic when displaying the backtrace of failing integration tests
• clippy: moved derive_partial_eq_without_eq to nursery
• clippy: never_loop: fix FP with let..else statements
• clippy: nonstandard_macro_braces do not modify macro arguments
• clippy: new uninlined_format_args lint to inline explicit arguments
• clippy: uninit_vec: fix false positive with set_len(0)
• rust-analyzer: add assist to unwrap tuple declarations
• rust-analyzer: fix diagnostics not working in enum variant bodies
• rust-analyzer: fix operator highlighting tags applying too broadly
• rust-analyzer: properly set the enum variant body type from the repr attribute
• rust-analyzer: properly support IDE functionality in enum variants
• rust-analyzer: use the sysroot proc-macro server for analysis-stats
• rust-analyzer: display the value of enum variant on hover
• rust-analyzer: type inference for generators

Rust Compiler Performance Triage

Overall a fairly quiet week in terms of new changes; the majority of the delta this week was due to reverting #101620, which was a regression noted in last week's report.

Triage done by @simulacrum. Revision range: 8fd6d03e2..d9297d22

2 Regressions, 7 Improvements, 3 Mixed; 3 of them in rollups 53 artifact comparisons made in total

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:

• Rust Style 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

• No RFCs entered Final Comment Period this week.

Tracking Issues & PRs

• [disposition: merge] Allow transmutes between the same types after erasing lifetimes
• [disposition: merge] Add AsFd implementations for stdio lock types on WASI.
• [disposition: merge] Tracking Issue for asm_sym

New and Updated RFCs

• [updated] Update RFC 2906 to match the implementation
• [new] RFC: Aligned trait
• [new] RFC: Field projection

Upcoming Events

Rusty Events between 2022-09-28 - 2022-10-26 🦀

Virtual

• 2022-09-28 | Virtual (London, UK) | Rust London User Group
  • Rust (Hybrid) Hack & Learn September 2022
• 2022-09-30 | Virtual (Minneapolis, MN, US) | Minneapolis Rust Meetup
  • Beginner Rust Open "Office Hours"
• 2022-10-04 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 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 (Dallas, TX, US) | Dallas Rust
  • Second Tuesday
• 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) | Microsoft Reactor San Francisco
  • Getting Started with Rust: Building Rust Projects
• 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
• 2022-10-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2022-10-20 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-10-25 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday

Asia

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

Europe

• 2022-09-28 | London, UK + Virtual | Rust London User Group
  • Rust (Hybrid) Hack & Learn September 2022
• 2022-09-29 | Amsterdam, NL | Rust Developers Amsterdam Group
  • Fiberplane Rust Workshop
• 2022-09-29 | Copenhagen, DK | Copenhagen Rust group
  • Rust Hack Night #29
• 2022-09-29 | Enschede, NL | Dutch Rust Meetup
  • Going full stack on Rust
• 2022-09-30 | Berlin, DE | RustFi Hackathon
  • RustFi Hackathon 30 Sept - 2 Oct
• 2022-10-02 | Florence, IT + Virtual | RustLab
  • RustLab Conference 2022 (Oct 2-4)
• 2022-10-03 | Stockholm, SE | Stockholm Rust
  • Rust Meetup @Microsoft Reactor
• 2022-10-04 | Helsinki, FI | Finland Rust Meetup
  • October meetup
• 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)
• 2022-10-18 | Paris, FR | Rust Paris
  • Rust Paris meetup #53

North America

• 2022-09-28 | Austin, TX, US | Rust ATX
  • Rust Lunch
• 2022-09-29 | Ciudad de México, MX | Rust MX
  • Zola o como la comunidad de RustMX tiene página
• 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.
• 2022-10-25 | Toronto, ON, CA | Rust Toronto
  • Rust DHCP

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

Semver has its philosophy, but a pragmatic approach to versioning is:

<upgrades may break API> . <downgrades may break API> . <fine either way>

– Kornel on rust-users

Thanks to Artem Borisovskiy 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.

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Discuss on r/rust