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

• [video] 2022-03-21 Cross Team Collaboration Fun Times (CTCFT)

Foundation

• Rust Community Grants Program - Survey Responses
• Announcing three new Rust Foundation Board Members

Project/Tooling Updates

• Rust-Analyzer Changelog #121
• Rust superpowered DHCP cli with Rhai scripts
• Fornjot (Code-CAD in Rust) - Weekly Dev Log - 2022-W11
• A Year of BonsaiDb: A retrospective and looking to the future
• Slint (GUI crate) weekly update
• This week in Fluvio #25: the programmable streaming platform
• Nushell 0.60
• Skytable 0.7.4 is here: authn, entity syntax, fixes and more
• Boa release v0.14
• This week in Databend #34: A Modern Cloud Data Warehouse for Everyone

Observations/Thoughts

• Rust is minimalist
• Rustc Reading Club Phase I Retrospective
• Rust's Unsafe Pointer Types Need An Overhaul - Faultlore
• Learning Rust: My 6 Key Moments
• I do understand the * operator in Rust now
• The code is the specification? Introducing cargo spec
• Functional Futures: Live-Coding Rust with Tim McNamara
• Help stabilize hyper in curl
• Do we really need language support for self-references?
• [video] Runtime-agnostic async crates by Zeeshan Ali
• [video] Tauri Foundations by Daniel Thompson-Yvetot
• [audio] id3 with Roel

Rust Walkthroughs

• Procedural macros under the hood: Part I
• A tour of the Rust and C++ interoperability ecosystem
• Architecture Experiment: Moving a front-end to Rust and WASM
• Web Socket for Productivity in Rust
• Advanced logging in rust with log4rs: rotation, retention, patterns, multiple loggers
• Why your first FizzBuzz implementation may not work
• [ZH] Exploring Rust Mobile Development and Cross-Platform Patterns (Rust 移动开发与跨平台模式探究)
• [series] [video] Writing a Programming Language (in Rust) 22: Laurel: Continuing a bash script port
• [video] Fyrox - Making an Animation Blending State Machine Editor
• [video] Petrochenkov reviews the name resolution code
• [video] UIUC CS 128 Honors Rust Lectures

Miscellaneous

• Cross-platform Brainfuck Interpreter implementation in Rust - Part 1
• Cross-platform Brainfuck Interpreter implementation in Rust - Part 2
• Rust talks I2C on Apache NuttX RTOS
• Rust Patches For The Linux Kernel Updated A Fifth Time With New Features
• [DE] Programmiersprache: Rust könnte neue Technik für Unsafe Pointer bekommen

Crate of the Week

This week's crate is heph, an event-driven, non-blocking I/O, share-nothing actor framework.

Thanks to Cole Lawrence 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.

CAD97/tracing-filter

• Collecting usage desires

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

Updates from the Rust Project

287 pull requests were merged in the last week

• always evaluate all cfg predicate in all() and any()
• stabilise aarch64_target_feature
• implement -Z oom=panic
• make negative coherence work when there's impl negative on super predicates
• more robust fallback for use suggestion
• suggest removing type ascription in bad parsing position
• improve unsafe diagnostic
• fix diagnostics for #![feature(deprecated_suggestion)]
• miri: add a lot more information to SB fatal errors
• miri: make backtraces work with #[global_allocator]
• miri: implement SIMD float rounding functions
• miri: implement SIMD square root and fused multiply-add
• miri: implement SIMD bitmask intrinsics
• add #[inline] to trivial AsRef/AsMut impls
• BTreeMap::entry: avoid allocating if no insertion
• implement Write for Cursor<[u8; N]>, plus A: Allocator cursor support
• improve expect impl and handle #[expect(unfulfilled_lint_expectations)] (RFC 2383)
• make Weak::new const
• portable-simd: fix big-endian bitmasks smaller than a byte
• libc: add support for Apple WatchOS
• codegen_gcc: fix ice in box alloc
• codegen_gcc: fix shift of unsigned integer by signed integer
• codegen_gcc: fix version of compiler_builtins to fix compilation failure
• cargo: fix panic when artifact target is used for [target.'cfg(<target>)'.dependencies
• rustfmt: add short_item_threshold config option
• rustfmt: honor #[rustfmt::skip::attributes(derive)] attribute
• rustfmt: search for struct body span after any generic arguments
• clippy: add lint cast_enum_constructor
• clippy: add or_then_unwrap
• clippy: don't lint ptr_arg on &mut Cow<_>
• clippy: don't lint transmute_undefined_repr when changing the type of generic params
• clippy: fix unncessary_to_owned false positive
• clippy: unnecessary_lazy_eval show suggestions on multiline lint
• clippy: fix suggestion on map_flatten being cropped causing possible information loss
• clippy: match_same_arms fix
• clippy: more transmute_undefined_repr fixes
• clippy: move iter_with_drain to nursery
• clippy: move try_err to restriction

Rust Compiler Performance Triage

Very quiet week for performance, with just one statistically significant change landing in the last week. This change was a regression, though primarily in stress tests, and was a result of a soundness fix.

Triage done by @simulacrum. Revision range: 3ba1ebea..3ea4493

1 Regressions, 0 Improvements, 0 Mixed; 0 of them in rollups 37 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:

• Add vendor-specific suffixes to v0 mangling RFC 2603

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: merge] Cargo authenticating users without sending secrets over the network
• [disposition: merge] Add provide_any module to core
• [disposition: close] Add the partial-closure-args RFC.

Tracking Issues & PRs

• [disposition: merge] Lazy tait (Type Alias Impl Trait) take two
• [disposition: close] Allow struct and enum to contain inner attrs
• [disposition: merge] Fix constants not getting dropped if part of a diverging expression
• [disposition: merge] impl From\<&[T; N]> and From\<&mut [T; N]> for Vec\<T>
• [disposition: merge] Docs: make Vec::from_raw_parts documentation less strict
• [disposition: merge] Clarify that ManuallyDrop\<T> has same layout as T
• [disposition: merge] Allow comparing Vecs with different allocators using ==
• [disposition: merge] Stabilize Termination and ExitCode
• [disposition: merge] Tracking Issue for cell_filter_map
• [disposition: merge] Stabilize native library modifier syntax and the whole-archive modifier specifically
• [disposition: merge] Tracking Issue for making ptr offset methods "const fn"

New and Updated RFCs

• [new] Refined trait implementations

Upcoming Events

Rusty Events between 2022-03-23 - 2022-04-20 🦀

Virtual

• 2022-03-23 | Egg Harbor City, NJ, US | Neighborhood Math Club
  • The Early Rustacean Gets The Worm!
• 2022-03-24 | Charlottesville, VA, US | Charlottesville Rust Meetup
  • Embedded Rust reaching out--Learn how Rust can interact with the outside world
• 2022-03-24 | Linz, AU | Rust Linz
  • Rust Meetup Linz - 20th Edition
• 2022-03-29 | Berlin, DE | Berline
  • Rust Hack and Learn Tuesday
• 2022-03-29 | Dallas, TX, US | Dallas Rust
  • Last Tuesday
• 2022-03-30 | México City, MX | Rust MX
  • Platica Marzo 2022 - Reescribir o no reescribir aplicaciones en Rust
• 2022-04-05 | Beijing, CN | WebAssembly and Rust Meetup (Rustlang)
  • Monthly WasmEdge Community Meeting, a CNCF sandbox WebAssembly runtime
• 2022-04-05 | Buffalo, NY, US | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2022-04-05 | Denver, CO, US | Rust Denver
  • Using Futures to wrap an unsafe USB API to play audio directly - with live stream
• 2022-04-06 | Egg Harbor City, NJ, US | Neighborhood Math Club
  • The Early Rustacean Gets The Worm!
• 2022-04-06 | Indianapolis, IN, US | Indy Rust
  • Indy.rs - with Social Distancing
• 2022-04-07 | Nürnberg, DE | Rust Nuremberg
  • Rust Nürnberg online #12
• 2022-04-12 | Dallas, TX, US | Dallas Rust
  • Second Tuesday
• 2022-04-12 | Seattle, WA, US | Seattle Rust Meetup
  • Monthly Meetup
• 2022-04-13 | Boulder, CO | Boulder Elixir and Rust
  • Monthly Meetup
• 2022-04-13 | Egg Harbor City, NJ, US | Neighborhood Math Club
  • The Early Rustacean Gets The Worm!
• 2022-04-13 | Munich, DE | Rust Munich
  • Rust Munich 2022 / 1 - hybrid
• 2022-04-19 | Washington, DC, US | Rust DC
  • Mid-month Rustful
• 2022-04-20 | Vancouver, BC, CA | Vancouver Rust
  • Rust Study/Hack/Hang-out night

Europe

• 2022-04-12 | Berlin, DE | Rust Berlin
  • Rust and Tell - an onsite event | Alt Link
• 2022-04-13 | Munich, DE | Rust Munich
  • Rust Munich 2022 / 1 - hybrid
• 2022-04-14 | Cambridge, UK | Cambridge Rust Meetup
  • Cambridge Rust Reboot 2

North America

• 2022-04-05 | Denver, CO, US | Rust Denver
  • Using Futures to wrap an unsafe USB API to play audio directly - with live stream
• 2022-04-13 | Atlanta, GA, US | Rust ATL
  • Grab a beer with fellow Rustaceans
• 2022-04-14 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting
• 2022-04-19 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person

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.

Rust Jobs

Bionaut Labs

• Embedded Software Engineer (Senior) (Remote)

OCR Labs

• Rust 🦀 Developer (Remote)

Komodo

• Software Developer interested in learning Rust (Remote)

Nimiq

• Blockchain Core Engineer (Remote)

Kollider

• Senior Frontend Engineer - Rust (Remote)
• Junior Backend Engineer - Rust (Remote)

Kraken

• Engineering Manager - Rust - Core Backend (Remote)
• Rust Engineer, Desktop GUI - Cryptowatch (Remote)
• Site Reliability Engineer - Rust - Core Backend (Remote)

Tweet us at @ThisWeekInRust to get your job offers listed here!

Quote of the Week

today I learned that unsafe is also a tool for people who are actively looking to implement bugs.

– blonk on rust-users

Thanks to Michael Bryan 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.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust