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 and archives can be viewed at this-week-in-rust.org. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community

Project/Tooling Updates

• esp-rs quarterly planning: Q1 2024
• Meilisearch 1.6 - AI search & 2x faster indexing
• capnproto-rust: 0.19 - ergonomic setters and faster reflection
• hyper - 2023 in review

Observations/Thoughts

• A universal lowering strategy for control effects in Rust
• Passing nothing is surprisingly difficult
• The memory remains: Permanent memory with systemd and a Rust allocator
• Higlights of 2023 for cargo-semver-checks
• The bane of my existence: Supporting both async and sync code in Rust
• A Guide to Rust ORMs in 2024
• Semantic search powered by WASM and WebGPU
• Embassy on ESP: UART Echo

Rust Walkthroughs

• Adventures in Binary Serialisation
• Creating 2 'Simple' Allocators
• Rust macros and Lambda boilerplate
• Let's make an information display in rust Part 2: The Frontend

Miscellaneous

• Clap - subcommands for command line applications in Rust
• SurrealDB in-memory with SQL demo in Rust
• Multi-counter with embedded SurrealDB database
• Xilem 2024 plans
• Rustaceans, say goodbye to lifetime errors: announcing nolife 0.3
• Auto-generating API service using Rust, to TypeScript & Dart
• From the rust community on Reddit: Rust in Aviation
• [audio] Apollo - Rust in Production Podcast
• [audio] Prossimo with Josh Aas

Crate of the Week

This week's crate is fish, a friendly interactive shell that used to be written in C++, but was recently rewritten in Rust (though admittedly they'll have to do some work until it hits your distro's repos).

Despite a lamentable lack of suggestions, llogiq is reasonably satisfied with his choice.

Please submit your suggestions and votes for next week!

Call for Participation; projects and speakers

CFP - Projects

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.

• ZeroCopy - Use cargo-semver-checks to make sure derive feature doesn't change API surface 2
• Ockam - remove_address_record function is called two times per Address during Processor shutdown
• Ockam - Command - refactor to use typed interfaces to implement commands for kafka services
• Ockam - Library - Validate CBOR structs according to the cddl schema for nodes/models/services
• Hyperswitch - [FEATURE]: Make cache configuration configurable at runtime
• Hyperswitch - [FEATURE]: Implement Code cov for local system using makefile
• Hyperswitch - [FEATURE]: Setup code coverage for local tests & CI
• Hyperswitch - [FEATURE]: Add domain type for client secret
• Hyperswitch - [FEATURE]: Have get_required_value to use ValidationError in OptionExt
• Fluvio - connector: fluvio-http-source, add an option to read data from a websocket
• Fluvio - MQTT Connector: Prefix auto generated Client ID to prevent connection drops

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

Updates from the Rust Project

418 pull requests were merged in the last week

• GNU/Hurd: unconditionally use inline stack probes
• rustc_codegen_ssa: Enforce rustc::potential_query_instability lint
• ~const trait and projection bounds do not imply their non-const counterparts
• add assume into NonZeroIntX::get
• add explicit none() value variant in check-cfg
• add more information to visit_projection_elem
• allow ~const on associated type bounds again
• avoid silencing relevant follow-up errors
• check rust lints when an unknown lint is detected
• coverage: add enums to accommodate other kinds of coverage mappings
• coverage: simplify building the coverage graph with CoverageSuccessors
• delegation implementation: step 1
• disallow reference to static mut and adding static_mut_ref lint
• don't ICE when noting GAT bounds in report_no_match_method_error
• don't reexport atomic::ordering via rustc_data_structures, use std import
• exclude well known names from showing a suggestion in check-cfg
• exhaustiveness: abort on type error
• exhaustiveness: track overlapping ranges precisely
• exhaustiveness: use an Option instead of allocating fictitious patterns
• fix ICE when suggesting dereferencing binop operands
• fix all_trait* methods to return all traits available in StableMIR
• fix allow_internal_unstable for (min_)specialization
• fix is_global special address handling
• fix unused_parens issue when cast is followed LT
• fix an ICE that occurs after an error has already been reported
• new flag to emit all the delayed bugs as errors (add -Zeagerly-emit-delayed-bugs)
• making User<T> and User<[T]> Send
• merge dead bb pruning and unreachable bb deduplication
• never patterns: Check bindings wrt never patterns
• pass LLVM error message back to pass wrapper
• register even erroneous impls
• remove -Zdont-buffer-diagnostics
• stop mentioning internal lang items in no_std binary errors
• store the segment name when resolution fails
• suggest upgrading compiler for gated features
• suggest quoting unquoted idents in attrs
• support async recursive calls (as long as they have indirection)
• taint _ placeholder types in trait impl method signatures
• unify query canonicalization mode
• remove a large amount of leb128-coded integers
• varargs support for system ABI
• stabilize mutex_unpoison feature
• A more efficient slice comparison implementation for T: !BytewiseEq
• tune the inlinability of unwrap
• cargo metadata: Stabilize id format as PackageIDSpec
• cargo resolver: do not panic when sorting empty summaries
• cargo: add guidance on setting homepage in manifest
• cargo: add unstable --output-format option to cargo rustdoc
• cargo: crates-io: set Content-Type: application/json only for requests with a body payload
• cargo: add rustc style errors for manifest parsing
• cargo: only inherit workspace package table if the new package is a member
• cargo: implementation of shallow libgit2 fetches behind an unstable flag
• cargo: introduce -Zprecise-pre-release unstable flag
• cargo: strip debuginfo when debuginfo is not requested
• rustdoc-search: reuse individual types in function signatures
• clippy: from_over_into: suggest a correct conversion to ()
• clippy: useless_asref: check that the clone receiver is the parameter
• clippy: correctly suggest std or core path depending if this is a no_std crate
• clippy: extend useless_asref lint on map(clone)
• clippy: fix false positive in PartialEq check in unconditional_recursion lint
• clippy: fix suggestion for map_clone lint on types implementing Copy
• clippy: make HirEqInterExpr::eq_block take comments into account while checking if two blocks are equal
• rust-analyzer: add notable_trait predicate to CompletionRelevance
• rust-analyzer: assist to merge nested if
• rust-analyzer: acknowledge pub(crate) imports in import suggestions
• rust-analyzer: differentiate between vfs config load and file changed events
• rust-analyzer: fix ast::Path::segments implementation
• rust-analyzer: fix incorrect parsing error on method call on range
• rust-analyzer: fix nested includes resolving from the wrong base file
• rust-analyzer: fix rust-analyzer-proc-macro-srv failing to spawn on windows
• rust-analyzer: preserve comments for extracted block expression in 'extract_function'
• rust-analyzer: remove sysroot-abi feature flag from proc-macro-test
• rust-analyzer: replace SourceRootCrates hashset output with slice for deterministic order
• rust-analyzer: resolve panic in generate_delegate_methods

Rust Compiler Performance Triage

This week had some small regressions that did not warrant further investigation, several of which were dismissed as being noise/blips in the data. There were also a number of gains. (Don't get exicited about that 20.6% improvement, its an measurement artifact from a temporary blip in the PR that immediately preceded this week's triage.)

Triage done by @pnkfelix. Revision range: 76101eec..f9c2421a

3 Regressions, 5 Improvements, 5 Mixed; 3 of them in rollups 55 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:

• RFC: Precise Pre-release cargo update
• Add RFC combining Infra and Release teams

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] Avoid non-local definitions in functions

Tracking Issues & PRs

• [disposition: merge] Stabilize single-field offset_of
• [disposition: merge] Undeprecate lint unstable_features and make use of it in the compiler
• [disposition: close] Fix non_camel_case_types for screaming single-words

Language Reference

• No Language Reference RFCs entered Final Comment Period this week.

Unsafe Code Guidelines

• No Unsafe Code Guideline RFCs entered Final Comment Period this week.

New and Updated RFCs

• RFC: Out-of-tree test suite

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 2024-01-17 - 2024-02-14 🦀

Virtual

• 2024-01-17 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2024-01-23 | Virtual (Halifax, NS, CA) | Rust Halifax
  • Rust&Tell - Halifax
• 2024-01-24 | Virtual (Berlin, DE) | WeAreDevelopers Community
  • WeAreDevelopers LIVE - Rust Day
• 2024-01-25 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
  • Crafting Interpreters in Rust Collaboratively
• 2024-01-25 | Virtual (Mexico City, DF, MX) | Rust MX
  • Iniciando 2024 con Rust
• 2024-01-28 | Virtual (Wrocław, PL) | Stacja IT Wrocław
  • Wprowadzenie do języka Rust
• 2024-01-30 | Virtual | Bevy Game Development
  • Bevy Meetup #1
• 2024-01-30 | Virtual (Buffalo, NY, US) | Buffalo Rust User Group
  • Buffalo Rust User Group
• 2024-01-30 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2024-01-31 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Rust for Rustaceans Book Club launch!
• 2024-02-01 | Virtual + In Person (Barcelona, ES) | BcnRust
  • 12th BcnRust Meetup - Stream
• 2024-02-01 | Virtual (Berlin, DE) | OpenTechSchool Berlin + Rust Berlin
  • Rust Hack n Learn | Mirror: Rust Hack n Learn
• 2024-02-03 | Virtual + In-person (Brussels, BE) | FOSDEM 2024
  • FOSDEM Conference: Rust devroom - talks
• 2024-02-03 | Virtual (Kampala, UG) | Rust Circle
  • Rust Circle Meetup
• 2024-02-04 | Virtual | Rust Maven
  • Web development with Rocket - In English
• 2024-02-07 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2024-02-08 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
  • Crafting Interpreters in Rust Collaboratively
• 2024-02-08 | Virtual (Nürnberg, DE) | Rust Nüremberg
  • Rust Nürnberg online
• 2024-02-10 | Virtual (Wrocław, PL) | Stacja IT Wrocław
  • Rust – budowanie narzędzi działających w linii komend
• 2024-02-13 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday

Europe

• 2024-01-17 | Girona, ES | Rust Girona
  • Que és Rust i els seus beneficis / What's Rust and its advantages
• 2024-01-17 | Praha / Prague, CZ | Rust Prague
  • Rust Meetup Reloaded 2024
• 2024-01-17 | Zurich, CH | Rust Zurich
  • How to Community - January Meetup
• 2024-01-23 | Aarhus, DK | Rust Aarhus
  • Hack and Learn
• 2024-01-23 | Paris, FR | Rust Paris
  • Paris Rust Meetup #64
• 2024-01-24 | Zagreb, HR | impl Zagreb for Rust
  • Rust Meetup 2024/01: WebGPU intro using Rust
• 2024-01-25 | Augsburg, DE | Rust Meetup Augsburg
  • Augsburg Rust Meetup #5: Async Part2 and Async in action
• 2024-01-25 | Vienna, AT | Rust Vienna
  • Rust Vienna Meetup - January - Blockchains and Data Pipelines
• 2024-02-01 | Hybrid (Barcelona, ES) | BcnRust
  • 12th BcnRust Meetup
• 2024-02-03 | Brussels, BE | FOSDEM '24
  • FOSDEM '24 Conference: Rust devroom - talks | Rust Aarhus FOSDEM Meetup
• 2024-02-06 | Bremen, DE | Rust Meetup Bremen
  • Rust Meetup Bremen [1]
• 2024-02-07 | London, UK | Rust London User Group
  • Rust for the Web — Mainmatter x Shuttle Takeover
• 2024-02-08 | Bern, CH | Rust Bern
  • Rust Bern Meetup #1 2024 🦀

North America

• 2024-01-17 | Chicago, IL, US | Deep Dish Rust
  • Rust Happy Hour
• 2024-01-18 | Seattle, WA, US | Seattle Rust User Group
  • Seattle Rust User Group Meetup
• 2024-01-22 | Boston, MA, US | Boston Rust Meetup
  • North End Rust Lunch
• 2024-01-24 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2024-01-27-28 | Calgary, AB, CA | Rust Calgary
  • Harnessing Rust for Real-World Problems hackathon: Day 1
  • Harnessing Rust for Real-World Problems hackathon: Day 2
• 2024-01-30 | Cambridge, MA, US | Boston Rust Meetup
  • Harvard Square Rust Lunch
• 2024-02-07 | Brookline, MA, US | Boston Rust Meetup
  • Coolidge Corner Brookline Rust Lunch, Feb 7
• 2024-02-12 | Minneapolis, MN, US | Minneapolis Rust Meetup
  • Minneapolis Rust: Open Source Contrib Hackathon & Happy Hour
• 2024-02-13 | New York, NY, US | Rust NYC
  • Rust NYC Monthly Mixer
• 2024-02-13 | Seattle, WA, US | Cap Hill Rust Coding/Hacking/Learning
  • Rusty Coding/Hacking/Learning Night

Oceania

• 2024-02-06 | Perth, WA, AU | Perth Rust Meetup Group
  • Rust Feb 2024 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

Congrats to the #Rustlang and #Rust-for-#Linux community: the #LinuxKernel now contains the first useful thing built using Rust!

– Thorsten Leemhuis on FOSStodon

As with the crate of the week, this week saw a total lack of suggestions, so llogiq would like to offer you this piece of good news from the Linux side of things.

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