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

Official

• Announcing Rust 1.70.0

Newsletters

• This Month in Rust GameDev #45 - April 2023
• This Month in Rust OSDev: May 2023

Project/Tooling Updates

• Changelog #184
• MsgPacker: Enhancing performance and security
• Diesel 2.1: Generated Migrations and simplified MultiBackend support
• Quickwit 0.6: Elasticsearch compatible API, range & prefix phrase queries, histogram & percentiles aggregations, and more...!
• Meilisearch 1.2 - new features for filters and engine improvements
• [video] The status of parallel rustc - Nicholas Nethercote

Observations/Thoughts

• A Proposal for an asynchronous Rust GUI framework
• A locking war story
• Building a Vector Database to Make Use of Vector Embeddings
• Data Exfiltration through DNS with Rust
• The Rust I Wanted Had No Future
• From Stacks to Trees: A new aliasing model for Rust
• ESP32 Embedded Rust at the HAL: GPIO Interrupts
• Introducing posh: Type-Safe Graphics Programming with Functional Shaders in Rust
• Demystifying trait generics in Rust

Rust Walkthroughs

• Writing universal libraries using C++ and consuming it in Rust (WASI)
• Rust's cfg Attribute
• Looking at Rust builtin derives
• What is WASI?
• Create a simple DSL for CSS like syntax for TUIs
• [video] A Practical Introduction to Derive Macros with Attributes

Miscellaneous

• [audio] Shuttle Launchpad with Stefan Baumgartner :: Rustacean Station
• [audio] Episode 5: Putting Lipstick on a Pig
• [video] Bevy Basics Timers
• [video] We Built a Blazingly Fast Video Conferencing System in Rust & WASM
• [video] Why Static Typing Came Back • Richard Feldman • GOTO 2022

Crate of the Week

This week's crate is kanata, a keyboard remapper for Linux and Windows.

Thanks to Aleksey Kladov 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.

• Hyperswitch - Remove redundant heap allocation (specifically string construction) in the application
• Hyperswitch - add domain type for client secret
• Hyperswitch - Implement cache for MerchantKeyStore
• Ockam - Add --yes flag to delete commands to prevent unintentional deletions
• Ockam - Define json output for ockam node create
• Ockam - unreported project path not found error

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

Updates from the Rust Project

392 pull requests were merged in the last week

• support 128-bit atomics on all x86_64 Apple targets
• support the rustc metadata for AIX
• QNX Neutrino: exponential backoff when fork/spawn needs a retry
• Control Flow Integrity: fix with repr(transparent): transform_ty: unexpected Alias(Proj
• Control Flow Integrity: fix async: transform_ty: unexpected GeneratorWitness(Bi…
• add other workspaces to linkedProjects in rust_analyzer_settings
• allow limited access to OsStr bytes
• check nested obligations during coercion unify in new solver
• diagnostics: exclude indirect private deps from trait impl suggest
• don't ICE in new solver when auto traits have associated types
• don't compute inlining status of mono items in advance
• don't require the output from libtest to be valid UTF-8
• don't suggest break through nested items
• don't typecheck recovered method call from suggestion
• enable ConstGoto and SeparateConstSwitch passes by default
• enable ScalarReplacementOfAggregates in optimized builds
• extra context for unreachable_pub lint
• fix bug where private item with intermediate doc hidden re-export was not inlined
• fix codegen test suite for bare-metal-like targets
• fix linkage for large binaries on mips64 platforms
• fix re-export of doc hidden item inside private item not displayed
• fix type-inference regression
• fix: dedup static_candidates before report
• improve CGU debug printing
• linker: report linker flavors incompatible with the current target
• normalize anon consts in new solver
• only check inlining counter after recursing
• only rewrite valtree-constants to patterns and keep other constants opaque
• only suppress coercion error if type is definitely unsized
• optimize scalar and scalar pair representations loaded from ByRef in llvm
• preserve substs in opaques recorded in typeck results
• refactor and cleanup the leak check, add it to new solver
• remove unneeded Buffer allocations when &mut fmt::Write can be used directly
• replace const eval limit by a lint and add an exponential backoff warning
• require that const param tys implement ConstParamTy
• rpath is not supported on AIX
• rust-lld: add rpath entry to the correct lib folder
• show note for type ascription on a local binding interpreted as a constant pattern and not a new variable
• stop normalizing so many different prefixes
• suggest Option::as_deref(_mut) on type mismatch in option combinator if it passes typeck
• suggest correct self_ty
• uplift clippy::cast_ref_to_mut lint
• uplift clippy::invalid_utf8_in_unchecked lint
• lower unchecked_div/_rem to MIR's BinOp::Div/Rem
• miri: Tree Borrows (TB) diagnostics: avoid printing irrelevant events
• miri: TB: improve error messages (distinguish between accesses and reborrows)
• miri: remove rustc-workspace-hack
• greatly decrease the size of rustc_driver.so when debuginfo is enabled
• remove ExtendElement, ExtendWith, extend_with
• remove [T]::zip(_)
• make TrustedStep require Copy
• offset_of!: don't require type to be Sized
• check tuple elements are Sized in offset_of!
• fix bug in utf16_to_utf8 for zero length strings
• hashbrown: add support for rkyv serialization and deserialization
• regex compile: make Regex::new(r"(?-u:\B)") fail again
• cargo: add message on reusing previous temporary path on failed cargo installs
• cargo: emit error when users try to use a toolchain via the add or install command
• cargo: support "default" option for build.jobs
• rustdoc: add interaction delays for tooltip popovers
• rustdoc: render visibility on associated types
• clippy: allow_attributes, allow_attributes_without_reason: Ignore attributes from procedural macros
• clippy: manual_let_else: support struct patterns
• clippy: nonminimal_bool fix double not
• clippy: ptr_cast_constness: Only lint on casts which don't change type
• clippy: unnecessary_lazy_eval: don't lint on types with deref impl
• clippy: useless_conversion: pluralize if there are multiple .into_iter() calls
• clippy: wildcard_imports Modules that contain prelude are also allowed
• clippy: add a test that checks for old style test headers
• clippy: add checking for cfg(features = ...)
• clippy: add lints for disallowing usage of to_xx_bytes and from_xx_bytes
• clippy: add spans to clippy.toml error messages
• clippy: emit unnecessary_cast on raw pointers as well
• clippy: fix suggestion on fully qualified syntax
• clippy: ignore fix for from_over_into if the target type contains a Self reference
• clippy: move redundant_clone to nursery
• clippy: new lint: explicit_into_iter_fn_arg
• clippy: new lint: missing_fields_in_debug
• rust-analyzer: add mandatory panic contexts to all threadpool tasks
• rust-analyzer: allow setting cfgs
• rust-analyzer: don't add --all-targets to runnables for no-std crates
• rust-analyzer: add signature help for tuple patterns and expressions
• rust-analyzer: render niches on hover
• rust-analyzer: fix Assist "replace named generic type with impl trait"
• rust-analyzer: fix unused-mut false positive for Box
• rust-analyzer: fix bug in labeled for loop desugaring
• rust-analyzer: fix drop scopes problems in mir
• rust-analyzer: fix edits for convert_named_struct_to_tuple_struct
• rust-analyzer: fix missing terminator for slice pattern
• rust-analyzer: fix string pattern matching in mir interpreter
• rust-analyzer: fix: add enum, reference, array and slice to render_const_scalar
• rust-analyzer: fix: add render configs for memory layout hovers
• rust-analyzer: fix: consider outer binders when folding captured items' type
• rust-analyzer: fix: detect "bound more than once" error and suppress need-mut for it
• rust-analyzer: fix: don't duplicate sysroot crates in rustc workspace
• rust-analyzer: fix: emit '_ for lifetime generics in HirDisplay
• rust-analyzer: fix nav target calculation discarding file ids from differing macro upmapping
• rust-analyzer: make assignment operators right associative
• rust-analyzer: prioritize threads affected by user typing
• rust-analyzer: support floating point intrinsics in const eval

Rust Compiler Performance Triage

This week was a bunch of improvements, largely driven by cutting std debuginfo in [#110221] and a few MIR or codegen optimizations. No pure regressions landed this week!

Triage done by @simulacrum. Revision range: 1221e43b..adc719d

Summary:

0 Regressions, 1 Improvements, 12 Mixed; 2 of them in rollups

79 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:

• eRFC: single-file packages ("cargo script") integration

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] TAIT defining scope options
• [disposition: merge] rustdoc-search: clean up type unification and "unboxing"
• [disposition: merge] Specify behavior of HashSet::insert
• [disposition: merge] Update runtime guarantee for select_nth_unstable
• [disposition: merge] Stabilize String::leak
• [disposition: merge] Implement TryFrom<&OsStr> for &str
• [disposition: merge] impl SliceIndex\<str> for (Bound\<usize>, Bound\<usize>)
• [disposition: merge] Stabilize const_cstr_methods
• [disposition: close] Add cfg(no_128_bit) to core: removes u128/i128 formatting
• [disposition: merge] rustdoc: search for slices and arrays by type with []

New and Updated RFCs

• [new] Fragment Specifiers for Generic Arguments
• [new] Virtually dispatched trait methods

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 2023-06-07 - 2023-07-05 🦀

Virtual

• 2023-06-07 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2023-06-07 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2023-06-08 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online
• 2023-06-13 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday
• 2023-06-14 | Virtual (Cardiff, UK) | Rust and C++ Cardiff
  • Building Spin Locks and Channels - Rust Atomics & Locks Bookclub Chapters 4 & 5
• 2023-06-14 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust
  • Monthly Meetup
• 2023-06-15 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2023-06-19 | Virtual (San Francisco, CA, US) | Data Science on AWS - San Francisco, Global
  • Generative AI Parameter Efficient Fine Tuning (PEFT), RLHF + Polars: "Polars, lightning-fast DataFrame library for Rust and Python", presented by Suman Debnath
• 2023-06-20 | Virtual (Berlin, DE) | Berline.rs / OpenTechSchool Berlin
  • Rust Hack and Learn
• 2023-06-20 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2023-06-21 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2023-06-22 | Virtual (Karlsruhe, DE) | Karlsruhe Functional Programmers Group
  • Stammtisch (gemeinsam mit der C++ UG KA)
• 2023-06-25 | Virtual (Auckland, NZ) | ResBaz Aotearoa 2023
  • Research Computing With The Rust Programming Language - Tim McNamara
• 2023-06-27 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2023-06-28 | Virtual (Chicago, IL, US) | Chicago Healthcare Cloud Technology Community
  • Rust for Mission-Critical AI: A Journey into Healthcare's Safest Language
• 2023-07-04 | Virtual (Berlin, DE) | Berline.rs / OpenTechSchool Berlin
  • Rust Hack and Learn
• 2023-07-04 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2023-07-05 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing

Asia

• 2023-06-10 | Kuala Lumpur, MY | GoLang Malaysia
  • Rust Workshop/Hack and Learn Malaysia June 2023 | Event updates Telegram | Event group chat
• 2023-06-10 | Pune, IN | Rust Pune
  • #1 - Meet & Greet

Europe

• 2023-06-08 | Aarhus, DK | Rust Aarhus
  • Rust Aarhus meetup #2 sponsored by BRØLSTÆRK
• 2023-06-08 | Paris, FR | Stockly.ai
  • Rust Meetup in Paris - hosted by Stockly
• 2023-06-08 | Zurich, CH | Rust Zurich
  • Unsafe, Miri, SIMD - June Meetup
• 2023-06-16 | Stuttgart, DE | Rust Community Stuttgart
  • OnSite Meeting
• 2023-06-22 | Vienna, AT | Papers We Love Vienna
  • June: Data and Ownership in Rust
• 2023-06-28 | Bratislava, SK | Bratislava Rust Meetup Group
  • Rust Meetup by Sonalake
• 2023-07-03 | Zurich, CH | Rust Zurich
  • Rust in the Linux Kernel - July Meetup

North America

• 2023-06-07 | Austin, TX, US | Rust ATX
  • Rust Lunch
• 2023-06-08 | Lehi, UT, US | Utah Rust
  • Rust 1.70.0, Module System Deep Dive & Pizza
• 2023-06-08 | Pasadena, CA, US | Pasadena Thursday Go/Rust
  • Weekly leetcode group
• 2023-06-10 | San Jose, CA, US | Rust Breakfast & Learn
  • Rust: breakfast & learn
• 2023-06-15 | Mountain View, CA, US | Mountain View Rust Meetup
  • Rust Meetup at Hacker Dojo
• 2023-06-17 | San Jose, CA, US | Rust Breakfast & Learn
  • Rust: breakfast & learn
• 2023-06-20 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2023-06-24 | San Jose, CA, US | Rust Breakfast & Learn
  • Rust: breakfast & learn
• 2023-07-01 | San Jose, CA, US | Rust Breakfast & Learn
  • Rust: breakfast & learn

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

(...) Rust developers usually are not just looking for "less buggy".

They are addicted to the clicky sound of legos.

– Amirography on fosstodon

Thanks to Jan Riemer 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