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.

Official

• Announcing Rust 1.68.0

Newsletters

• This Month in Rust GameDev #43 - February 2023

Project/Tooling Updates

• IntelliJ Rust Changelog #190
• rust-analyzer changelog #172
• rustc_codegen_gcc: Progress Report #21
• Fornjot (code-first CAD in Rust) - Weekly Release - Thoroughly Mediocre
• Rust Insight! - an interactive book for practicing Rust
• Mockito, the HTTP mocking library for Rust, goes 1.0
• Klint: Compile-time Detection of Atomic Context Violations for Kernel Rust Code
• Leveraging Rust and the GPU to render user interfaces at 120 FPS

Observations/Thoughts

• To async trait or just to trait
• Writing an LLVM backend for the Move language in Rust
• STM32F4 Embedded Rust at the PAC: UART Communication
• A Guide to Declarative Macros in Rust
• SQLx Compile Time Woes
• I built a startup in Rust, I would do it again.
• rustdoc and the re-exports
• The registers of Rust
• Switching From C++ to Rust
• Emitting Safer Rust with C2Rust
• Applying 5 million pixel updates per second with Rust & wgpu
• Rust in the Real World: Super Fast Data Ingestion Using ScyllaDB
• Rust: How We Built a Privacy Framework for Data Science
• Writing a Kubernetes Operator
• Getting Past “Ampersand-Driven Development” in Rust
• (video) Teaching Embedded Rust

Rust Walkthroughs

• Beginning Rust: by exploring a very basic Axum web API in detail
• Rewriting the CLI in Rust: Was It Worth It?
• Trace through a Kafka Cluster using OpenTelemetry
• Tour of a HTTP request in Rust

Miscellaneous

• Why Turborepo is migrating from Go to Rust
• Leveraging Rust and the GPU to render user interfaces at 120 FPS
• Automotive Safety and Cybersecurity: Infineon's AURIX™ TC3xx, TC4x, TRAVEO™ T2G & PSoC families of microcontrollers support Rust - Infineon Technologies
• [video] Bestagon Mesh Generation: Waveform Collapse in Bevy
• [video] Bye WebSockets! Boost Web Comms with Rust and WebTransport
• [video] Learn Bevy 0.10 - EP4 - Enemy Movement, Collisions, Sound Effects, Despawning
• [video] Rust Releases! Rust 1.68.0
• [video] Interview and AMA with Josh Triplett
• [audio] Q&A with Mara Bos

Crate of the Week

This week's crate is duplicate, a proc macro crate for easy parametric code duplication.

Thanks to Anton Fetisov for the suggestion!

Please submit your suggestions and votes for next week!

Call for Participation

Always wanted to contribute to open-source projects but did not 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.

• man-in-the-middle-proxy - Make order with constants and hard coded parts
• man-in-the-middle-proxy - pause and play the request
• man-in-the-middle-proxy - Highlight a request in the list when clicked
• man-in-the-middle-proxy - add different colors for different request method
• Ockam - Create clap command to show the details of an existing TCP connection on a node
• Ockam - Create clap command to show the details of an existing Forwarder on a node
• Ockam - improve install.sh to install in path

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

Updates from the Rust Project

391 pull requests were merged in the last week

• account for binders correctly when adding default RPITIT method assumption
• force parentheses around match expression in binary expression
• allow negative numeric literals in concat!
• add suggestion to diagnostic when user has array but trait wants slice
• always resolve to universal regions if possible
• check for free regions in MIR validation
• check that a query has not completed and is not executing before starting it
• custom MIR: Support as casts
• directly construct Inherited in typeck
• do not ICE when failing to normalize in ConstProp
• do not ICE when interpreting a cast between non-monomorphic types
• do not ICE when we have fn pointer Fn obligations with bound vars in the self type
• do not consider &mut *x as mutating x in CopyProp
• don't even try to combine consts with incompatible types
• emit alias-eq when equating numeric var and projection
• emit the suspicious_auto_trait_impls lint for negative impls as well
• ensure value is on the on-disk cache before returning from ensure()
• expand on the allocator comment in rustc-main
• improve errors in case of ident with number at start
• impl better help for .poll() not found on impl Future
• implement better error for manual impl of Fn* traits
• avoid unnecessary hashing
• fix invalid inlining of reexport of reexport of private item
• gate usages of dyn* and const closures in macros
• greatly improve the error messages when run-make/translation fails
• honor current target when checking conditional compilation values
• implement goal caching with the new solver
• make RPITITs simple cases work when using lower_impl_trait_in_trait_to_assoc_ty
• make unused_allocation lint against Box::new too
• place binder correctly for arbitrary trait bound suggestion
• relax ordering rules for asm! operands
• strengthen state tracking in const-prop
• tweak illegal Copy impl message
• unconstrained terms should account for infer vars being equated
• fix projection substitution order considering GATs
• remove box_syntax
• stabilize nonzero_min_max
• stabilize path_as_mut_os_str
• stabilize movbe target feature
• add round_ties_even to f32 and f64
• make ptr::from_ref and ptr::from_mut const
• move Option::as_slice to an always-sound implementation
• prevent overflow through Arc::downgrade
• introduce Rc::into_inner, as a parallel to Arc::into_inner
• futures: Add AbortRegistration::handle
• futures: Make BiLock strict-provenance compatible
• futures: TryFlattenUnordered: propagate base stream error
• cargo: Adding display of which target failed to compile
• cargo: cargo install --git multiple packages with binaries found hint
• rustdoc: don't crash on crate references in blocks
• rustdoc: don't hide anonymous reexport
• rustdoc: include link on all.html location header
• rustdoc: reduce allocs in FnDecl::inner_full_print
• rustdoc: sort deprecated items lower in search
• rustdoc: use restricted Damerau-Levenshtein distance for search
• clippy: add collection_is_never_read
• clippy: add let_with_type_underscore lint
• clippy: add missing_assert_message lint
• clippy: add new redundant_async_block lint
• clippy: add the popular-crates binary
• clippy: don't lint manual_clamp in const contexts
• clippy: fix semicolon insertion in match_single_binding
• clippy: improve diagnostic of no_mangle_with_rust_abi
• clippy: include async functions in the len_without_is_empty
• clippy: arithmetic_side_effects fix false positive on shifts
• rust-analyzer: add core lib to proc_macro dependencies
• rust-analyzer: fix stack overflow when derefrencing &!
• rust-analyzer: allow adding extra cargo args when running build scripts
• rust-analyzer: fix multiple definition binding in match to let-else
• rust-analyzer: don't trigger unresolved method/field diagnostics on types containing errors
• rust-analyzer: evaluate consts in path_to_const
• rust-analyzer: fix block defmap not looking into tail expressions for macro calls
• rust-analyzer: fix search not searching bodies of attributed items
• rust-analyzer: highlight unresolved derives as being unresolved
• rust-analyzer: load proc-macros for rustc_private crates
• rust-analyzer: watch both stdout and stderr in flycheck

Rust Compiler Performance Triage

A fairly mixed week, with several significant improvements and a few significant regressions. On average, this week saw a slight increase in compile times.

Triage done by @simulacrum. Revision range: 8f9e09ac..0058748

4 Regressions, 6 Improvements, 4 Mixed; 2 of them in rollups 39 artifact comparisons made in total

Full report here

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] Tracking Issue for {Arc, Rc}::into_inner
• [disposition: merge] rustdoc: add support for type filters in arguments and generics
• [disposition: merge] Lint ambiguous glob re-exports

New and Updated RFCs

• [new] Add a count parameter to the expect attribute
• [new] Allow cfg-attributes in where clauses

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.

Upcoming Events

Rusty Events between 2023-03-15 - 2023-04-12 🦀

Virtual

• 2023-03-15 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Injecting Rust Hooks into a 1999 game binary (unsafe)
• 2023-03-15 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2023-03-16 | Virtual (Raleigh, NC, US) | Triangle BitDevs
  • Rust for Bitcoiners
• 2023-03-16 | Virtual (Redmond, WA, US) | Microsoft Reactor Redmond
  • Introduction to WebAssembly (WASM) with Rust and WASMEdge
• 2023-03-16 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2023-03-21 | Virtual (Redmond, WA, US) | Microsoft Reactor Redmond
  • Crack code interview problems in Rust: S2 Ep2
• 2023-03-21 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful—Using Category Theory to Parse Command-line Options
• 2023-03-22 | Virtual (Richmond, VA, US) | Rustaceans RVA
  • Rustaceans RVA - March Meetup
• 2023-03-27 | Virtual | Rust Formal Methods Interest Group
  • Flux: Ergonomic Verification of Rust Programs with Liquid Types
• 2023-03-28 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2023-03-28 | Virtual (Redmond, WA, US) | Microsoft Reactor Redmond
  • Crack code interview problems in Rust: S2 Ep3
• 2023-03-29 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Writing your own rust 'book' with mdBook
• 2023-04-04 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2023-04-05 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2023-04-05 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2023-04-11 | Virtual | Rust Live
  • Rust Live: Asynchronous Rust

Europe

• 2023-03-09 | Basel, CH | Rust Basel
  • Rust Meetup #7
• 2023-03-09 | Delft, NL | Rust Nederland
  • Regular track: Embedded Rust
  • Student track: Embedded Rust
• 2023-03-09 | Lyon, FR | Rust Lyon
  • Rust Lyon Meetup #2
• 2023-03-15 | Nürnberg, DE | Rust Nuremberg
  • Walk around Embedded World Exhibition
• 2023-03-15 | Trondheim, NO | Rust Trondheim
  • Rust graphics with nannou
• 2023-03-16 | Paris, FR | OCaml Users in Paris - OUPS
  • OUPS Mars 2023: Creusot a prophetic verifier for Rust -- Xavier Denis
• 2023-03-17 | Stuttgart, DE | Rust Community Stuttgart
  • OnSite Meeting
• 2023-03-28 | Zurich, CH | Rust Zurich
  • High performance concurrent data structures in Rust - March Meetup
• 2023-03-29 | Paris, FR | Rust Paris
  • Rust Paris meetup #57
• 2023-04-04 | Berlin, DE | Berline.rs
  • Rust and Tell - Goodbye👋 Edition

North America

• 2023-03-21 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person

Asia

• 2023-04-08 | Kyoto, JP | Kansai Rust
  • Demystifying Closures

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

The Rust compiler is a thousand unit tests that you don't have to write

– Someone, likely Ian Purton on the Cloak blog

Thanks to Stephan Sokolow 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