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 regex 1.9

Newsletters

• This Month in Rust OSDev: June 2023

Project/Tooling Updates

• Regex engine internals as a library
• Bevy 0.11
• rustc_codegen_gcc: Progress Report #24
• rust-analyzer changelog #189
• Vector storage is coming to Meilisearch to empower search through AI | Rust SDK
• Rust on Espressif chips - June 30 2023
• esp-rs quarterly planning: Q3 2023
• SQLPage • Build dynamic websites in SQL

Observations/Thoughts

• Deref specialization in const contexts
• How to think about async/await in Rust
• Back-end parallelism in the Rust compiler
• bridging fuzzing and property testing
• Mastering Rust: 2 Years of Building Brilliance and Lessons Learned
• Learning Rust - the first month
• Ideas for crafting CLI in Rust
• Beyond Pointers: How Rust outshines C++ with its Borrow Checker
• [audio] Shuttle with Ivan Cernja

Rust Walkthroughs

• [video] Build A Full Stack Chatbot in Rust (feat. Leptos & Rustformers)
• [video] Render the Julia set in 3 dozen lines of Rust code
• How We Generate JavaScript and Python SDKs From Our Canonical Rust SDK
• Put a Pin on That
• Unit-testing a web service in Rust

Miscellaneous

• Docker Desktop 4.21: Support for new Wasm runtimes, Docker Init support for Rust, Docker Scout Dashboard enhancements, Builds view (Beta), and more
• Rust Digger: identify low-hanging fruit improvements to crates

Crate of the Week

This week's crate is dysk, a nice df like utility to display the fill level of your disks.

Thanks to Denys Séguret for the self-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.

• RustQuant - autodiff module needs re-structure to avoid lifetimes.
• Ockam - Add sqlite support as an alternative to lmdb 2
• Ockam - Improve Secure Channel shutdown (make Encryptor and Decryptor shut down each other)
• Ockam - Improve Secure Channel shutdown (make Encryptor or Decryptor remove itself from the Registry) #5323
• Hyperswitch - Implement Code coverage for local system using Makefile
• Hyperswitch - Add scoped error enum for customer error
• Hyperswitch - Add logs for customer routes & functions

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

Updates from the Rust Project

378 pull requests were merged in the last week

• add basic types to SMIR
• add flag for enabling global cache usage for proof trees and printing proof trees on error
• add simple markdown formatting to rustc --explain output
• avoid calling item_name for RPITIT
• avoid calling report_forbidden_specialization for RPITITs
• don't ICE in resolve_bound_vars when associated return-type bounds are in bad positions
• don't ICE for dyn* Trait: Trait (built-in object) goals during selection in new trait solver
• don't require associated types with Self: Sized bounds in dyn Trait objects
• effects/keyword generics MVP
• fix the issue of wrong diagnosis for extern pub fn
• implement ConstEvaluatable goals in new solver
• llvm ffi: Expose CallInst->setTailCallKind
• make RPITITs assume/require their parent method's predicates
• prefer object candidates in new selection
• replace RPITIT current impl with new strategy that lowers as a GAT
• require TAITs to be mentioned in the signatures of functions that register hidden types for them
• suggest importing for partial mod path matching in name resolving
• miri: check that assignments do not self-overlap
• miri: better error on missing #[start]
• miri: restore test filtering by substring
• miri: test and fix return place alias restrictions
• perform TokenStream replacement in-place when possible in expand_macro
• add Read, Write and Seek impls for Arc<File> where appropriate
• additional io::copy specializations
• regex: automata/nfa/backtrack: fix memory usage
• rewrite the regex crate
• cargo: add profile strip to config docs
• rustfmt: handle skip_macro_invocations from config file
• clippy: [significant_drop_tightening] consider manual aliases of the drop function
• clippy: arc_with_non_send_sync: reword and move to suspicious
• clippy: filter_next: suggest making binding mutable if needed
• clippy: manual_range_patterns: lint negative values
• clippy: unnecessary_literal_unwrap: don't lint if binding initializer comes from expansion
• clippy: add needless_pass_by_ref_mut lint
• clippy: fix ICE in needless_borrow
• clippy: fix regex lints for regex 1.9.0
• clippy: new lint manual_partial_ord_and_ord_impl
• clippy: new lint: read_line_without_trim
• clippy: new lints manual_is_infinite and manual_is_finite
• clippy: pass correct substs to implements_trait in incorrect_impls
• rust-analyzer: assist: add enum to glob_import_expand
• rust-analyzer: assist: generate trait from impl
• rust-analyzer: disable remove unnecessary braces diagnotics for self imports
• rust-analyzer: feature: add a memory layout viewer
• rust-analyzer: fix size_of_val and support min_align_of_val
• rust-analyzer: fix missing terminator in pattern matching of consts
• rust-analyzer: fix: don't show unresolved-field diagnostic for missing names
• rust-analyzer: fix: indent after pressing enter on a blank line
• rust-analyzer: implement recursion in mir interpreter without recursion
• rust-analyzer: recover from missing associated items and generic const defaults
• rust-analyzer: stop inserting semicolon when extracting match arm
• rust-analyzer: support GATs in bounds for associated types
• rust-analyzer: support read_via_copy intrinsic
• rust-analyzer: support getrandom syscall

Rust Compiler Performance Triage

A very quiet week with nearly no changes in compiler performance.

Triage done by @rylev. Revision range: 52d8c49..1d4f5af

Summary:

4 Regressions, 2 Improvements, 2 Mixed; 1 of them in rollups 51 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: Start working on a Rust specification

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] Implement RefUnwindSafe for Backtrace

New and Updated RFCs

• [new] Add bf16, f64f64 and f80 types

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 2023-07-12 - 2023-08-09 🦀

Virtual

• 2023-07-11 - 2023-07-13 | Virtual (Europe) | Mainmatter
  • Web-based Services in Rust, 3-day Workshop with Stefan Baumgartner
• 2023-07-13 - 2023-07-14 | Virtual | Scientific Computing in Rust
  • Scientific Computing in Rust workshop
• 2023-07-13 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
  • Crafting Interpreters in Rust Collaboratively
• 2023-07-13 | Virtual (Edinburgh, UK) | Rust Edinburgh
  • Reasoning about Rust: an introduction to Rustdoc’s JSON format
• 2023-07-13 | Virtual (Nuremberg, DE) | Rust Nuremberg
  • Rust Nürnberg online #27
• 2023-07-15 | Virtual (Chandigarh, IN) | Rust Chandigarh
  • Rust Chandigarh Meetup #1
• 2023-07-18 | Virtual (Berlin, DE) | OpenTechSchool Berlin
  • Rust Hack and Learn
• 2023-07-19 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Rust Study/Hack/Hang-out
• 2023-07-20 | Virtual (Tehran, IR) | Iran Rust Meetup
  • Iran Rust Meetup #12 - Ownership and Memory management
• 2023-07-24 | Virtual (Toronto, CA) | Programming Languages Virtual Meetup
  • Crafting Interpreters Chapter 18: Types of Values
• 2023-07-25 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2023-07-27 | Virtual (Charlottesville, NC, US) | Charlottesville Rust Meetup
  • Crafting Interpreters in Rust Collaboratively
• 2023-07-28 | Virtual (Tunis, TN) | Rust Meetup Tunisia
  • Rust Meetup Tunisia - Volume I, Number IV
• 2023-08-01 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2023-08-08 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday

Asia

• 2023-07-13 | Tokyo, JP | Tokyo Rust Meetup
  • A "Bit" of Fun With Geometry in Rust

Europe

• 2023-07-13 | Berlin, DE | Rust Berlin
  • Rust and Tell - beer garden Edition
• 2023-07-13 | Reading, UK | Reading Rust Workshop
  • Reading Rust Meetup at Browns
• 2023-07-21 | Nuremberg, DE | Rust Nuremberg
  • Rust Nuremberg Get Together #2

North America

• 2023-07-12 | Austin, TX, US | Rust ATX
  • Rust Lunch - Fareground
• 2023-07-12 | Waterloo, ON, CA | Rust KW
  • Overengineering FizzBuzz
• 2023-07-13 | Lehi, UT, US | Utah Rust
  • Writing Kubernetes Operators in Rust
• 2023-07-13 | Mountain View, CA, US | Mountain View Rust Meetup
  • Rust Meetup at Hacker Dojo
• 2023-07-13 | Seattle, WA, US | Seattle Rust User Group
  • July Meetup
• 2023-07-18 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person

Oceania

• 2023-07-18 | Canberra, ACT, AU | Rust Canberra
  • July 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

It's all ducks and sunshine until something starts barking.

– u/ZZaaaccc on r/rust

Thanks to Patrice Peterson 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