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

Newsletters

• This Month in Rust GameDev #33 - April 2022

Project/Tooling Updates

• rust-analyzer changelog #129
• IntelliJ Rust Changelog #170
• What's new in SeaORM 0.8.0
• Fornjot (code-first CAD in Rust) - Weekly Dev Log - 2022-W19
• Introducing BlindAI, an open-source privacy-friendly AI deployment in Rust
• Slint (UI crate) weekly update -- Version 0.2.4 Release
• This week in Databend #41: A Modern Cloud Data Warehouse for Everyone
• This week in Databend #42: A Modern Cloud Data Warehouse for Everyone
• Fyrox 0.25 Feature Highlights

Observations/Thoughts

• Things Are Getting Rusty In Kernel Land
• A new impl Trait
• Our Experience Porting the YJIT Ruby Compiler to Rust
• Comparing Rust supply chain safety tools
• Supply Chain Thoughts
• Can you have too many programming language features?
• Asteracea (platform-agnostic mixed-style frontend components)
• PixelBox Public Alpha
• [video] Building a Postgres storage system in Rust
• [video] Rust: Your code can be perfect
• [video] Systems Programmers Can Have Nice Things
• [video] The Rust Borrow Checker - a Deep Dive
• [audio] Slint with Tobias Hunger

Rust Walkthroughs

• Extending SQLite with Rust
• Let's talk about this async
• Bitsquatting attacks and exploit in Rust
• Building a crawler in Rust: Scraping Javascript Single Page Applications (SPA) with a headless browser
• Learning Rust - creating a full-text search engine
• Compiler Adventures, part 3: Value Numbering
• Do not wait for Rust generators
• Rust Ergonomics: Default and From
• Audio Libraries Considered Challenging
• Linking Rust Crates, Part 1
• A Guided Tour of Streams in Rust
• [video] Rust Bevy 0.7 - Full Tutorial - Game Development with Rust

Research

• Ferrite: A Judgmental Embedding of Session Types in Rust

Miscellaneous

Crate of the Week

This week's crate is cargo-supply-chain, a cargo subcommand to gather author, contributor and publisher data on crates in your dependency graph.

Despite a lack of nominations, llogiq is pleased with his choice.

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.

• Polkadot Blockchain Academy - Course on all things Rust, Substrate, Polkadot and Parity

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

Updates from the Rust Project

341 pull requests were merged in the last week

• Add EarlyBinder
• rustc: Stricter checking for #[link] attributes
• Detect trait fulfillment in subst_and_check_impossible_predicates
• Gracefully fail to resolve associated items instead of delay_span_bug
• Stop suggesting non-existing fully qualified paths
• Implement a lint to warn about unused macro rules
• Check hidden types for well formedness at the definition site instead of only at the opaque type itself
• Drop tracking: handle invalid assignments better
• Forbid nested opaque types to reference HRTB from opaque types
• Don't subst an AdtDef with its own substs
• miri: Add a command line flag to avoid printing to stdout and stderr
• miri: Print spans where tags are created and invalidated
• miri: Use atomic RMW for {mutex, rwlock, cond, srwlock}_get_or_create_id functions
• Initial work on Miri permissive-exposed-provenance
• Use FxIndexSet to avoid sorting fake borrows
• make sure ScalarPair enums have ScalarPair variants; add some layout sanity checks
• optimize insert_range method of IntervalSet
• Make BorrowedFd::borrow_raw a const fn
• ExitCode::exit_process() method
• Fix array::IntoIter::fold to use the optimized Range::fold
• futures: Make run_until_stalled handle self-waking futures
• futures: Remove TryStreamExt::into_async_read Unpin bound
• cargo: Pass --target to rustdoc for cargo test if specified with host target
• cargo install: Support foo@version like cargo-add
• cargo yank: Support foo@version like cargo-add
• rustdoc: correct path to type alias methods
• rustdoc: search result ranking fix
• clippy: Add duplicate_mod lint
• clippy: Add version filtering option to the lint list
• clippy: Don't lint vec_init_then_push when further extended
• clippy: Fix ICE in let_unit_value when calling a static or const callable type
• clippy: Fix match_single_binding suggestion for assign expressions
• clippy: Fix redundant_allocation warning for Rc<Box<str>>
• clippy: New lint: derive_partial_eq_without_eq
• clippy: Rename eval_order_dependence to mixed_read_write_expression, move to nursery
• clippy: undocumented_unsafe_blocks does not trigger on unsafe trait impls
• clippy: introduce rc_clone_in_vec_init lint
• rust-analyzer: Config revamp
• rust-analyzer: Add binding mode inlay hints
• rust-analyzer: Allow reborrow inlay hints to be restricted to mutable reborrows only
• rust-analyzer: Change VSCode extension publisher to rust-lang
• rust-analyzer: Handle getters and setters in documentation template assist
• rust-analyzer: Improve "Generate Deref impl" assist
• rust-analyzer: Show inlay hints after a } to indicate the closed item
• rust-analyzer: Support variable substitution in VSCode settings
• rust-analyzer: include associated types in trait signature help
• rust-analyzer: Add cast expressions to param name inlay hint heuristics
• rust-analyzer: Fix config patching failing when appending suffixes
• rust-analyzer: Fix fill-arguments completions not working
• rust-analyzer: Fix incorrect hover actions config keys
• rust-analyzer: Fix old config patching overwriting callable snippet config unconditionally
• rust-analyzer: don't panic at fully qualified call syntax in signature help
• rust-analyzer: insert whitespace between 'mut' and 'self' in macro expansion

Rust Compiler Performance Triage

It was a somewhat quiet week with real-world benchmarks showing a slight improvement on average and only one real-world crate, bitmaps, experiencing regressions. Unfortunately, the cause of the regressions don't look straightforward though. The biggest performance win came from a change to not encode attributes in metadata that are only used within the local crate. This improved doc builds of 16 of the 18 real world crates we run in our performance suite!

Triage done by @rylev. Revision range: c51871..7355d

Summary:

2 Regressions, 4 Improvements, 0 Mixed; 0 of them in rollups 51 artifact comparisons made in total

See the full report for more.

Call for Testing (New!)

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:

• RFC: Deduplicate Cargo workspace information
  • Tracking Issue
  • Testing steps
• Tracking Issue for scoped threads
  • Feature documentation
• RFC: Packages as (optional) namespaces

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.

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: Add target configuration

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] Create a types team

Tracking Issues & PRs

• [disposition: merge] Neither require nor imply lifetime bounds on opaque type for well formedness
• [disposition: merge] impl Read and Write for VecDeque\<u8>
• [disposition: merge] Tracking Issue for int_roundings

New and Updated RFCs

• [new] RFC: Rust SemVer 2

Upcoming Events

Rusty Events between 2022-05-18 - 2022-06-15 🦀

Virtual

• 2022-05-18 | Philadelphia, PA, US | Rust Philly (Rust Philadelphia)
  • Remote Book Club: Rust for Rustaceans Chapter Discussion
• 2022-05-18 | Vancouver, BC, CA | Vancouver Rust
  • Rust Study/Hack/Hang-out night
• 2022-05-24 | Berlin, DE | OpenTechSchool Berlin & Berline.rs
  • Rust Hack and Learn
• 2022-05-24 | Hyderbad, IN | Rust Language Hyderbad
  • Rust Forum (half day event)
• 2022-05-24 | San Francisco, CA, US | Rust Bay Area
  • (@ Google) What is soundness anyways? (Livestream)
• 2022-05-25 | Stuttgart, DE | Rust Community Stuttgart
  • Rust-Meetup
• 2022-05-31 | Dallas, TX, US | Dallas Rust
  • Last Tuesday
• 2022-06-01 | Indianapolis, IN, US | Indy Rust
  • Indy.rs - with Social Distancing
• 2022-06-01 | Philadelphia, PA, US | Rust Philly (Rust Philadelphia)
  • Remote Book Club: Rust for Rustaceans Chapter Discussion
• 2022-06-07 | Beijing, CN | WebAssembly and Rust Meetup (Rustlang)
  • Monthly WasmEdge Community Meeting, a CNCF sandbox WebAssembly runtime
• 2022-06-07 | Buffalo, NY, US | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2022-06-08 | Boulder, CO, US | Boulder Elixir and Rust
  • Monthly Meetup
• 2022-06-09 | Nürnberg, DE | Rust Nurnberg DE
  • Rust Nürnberg online
• 2022-06-09 | San Diego, CA, US | San Diego Rust
  • San Diego Rust June 2022 Tele-Meetup
• 2022-06-09 | Stuttgart, DE | Rust Community Stuttgart
  • Rust-Meetup
• 2022-06-14 | Dallas, TX, US | Dallas Rust
  • Second Tuesday
• 2022-06-15 | Philadelphia, PA, US | Rust Philly (Rust Philadelphia)
  • Remote Book Club: Rust for Rustaceans Chapter Discussion
• 2022-06-15 | Vancouver, BC, CA | Vancouver Rust
  • Rust Study/Hack/Hang-out night

North America

• 2022-05-24 | San Francisco, CA, US | Rust Bay Area
  • (@ Google) What is soundness anyways?
• 2022-05-25 | New York, NY, US | Rust NYC
  • May Lightning Talks: State machines for sync, BonsaiDB, WASM Cloudflare Workers
• 2022-06-08 | Atlanta, GA, US | Rust ATL
  • Grab a beer with fellow Rustaceans
• 2022-06-09 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting

Europe

• 2022-05-18 | Stockholm, SE | Stockholm Rust
  • Rust Meetup @AWS
• 2022-05-19 & 05-20 | Berlin, DE | Entwickler.de
  • Rust Summit (paid)
• 2022-05-24 | Amsterdam, NL | Rust Developers Amsterdam Group
  • Rust Developer Meetup: Lightning Talks @ Fiberplane
• 2022-05-30 | London, UK | Rust London User Group
  • LDN Talks May 2022 Quickwit Takeover RSVP @Skills Matter
• 2022-05-31 | Rome, IT | Rust Roma
  • When Rocket is fueled by Diesel #Aperitech

Oceania

• 2022-05-26 | Brisbane City, QL | Rust Brisbane
  • May 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.

Rust Jobs

Disney

• Sr Rust Engineer (New York, NY, US, San Francisco, CA, US, Remote US/Europe)

StructionSite

• Full Stack Engineer - Elm/Rust (Remote US)

Clear

• Full Stack Developer (Remote)

Audiotool

• Rust / Audio DSP Developer

Anixe

• Rust Software Engineer (Remote or hybrid work PL, GR)

Instant Domains

• Experienced Rust Engineer (Remote, +/- 3 hours of CET)

Spire Global

• Software Engineer (Glasgow, UK, Remote UK, Luxembourg - Relocation Available)

Enso

• Senior Rust IDE Developer (Remote EU, US)
• Senior Cloud Rust Engineer (Remote EU, US)

Stockly

• Back-end developer - Engine (Rust, gRPC, PostgreSQL) (Paris, FR)
• Back-end developer (Rust, gRPC, PostgreSQL) (Paris, FR)

Kraken

• Engineering Manager - Rust - Core Backend (Remote)
• Backend Engineer - Rust - Core Backend (Remote)
• Backend Engineer, Kraken Futures - Rust (Remote)

Estuary

• Developer Evangelist (New York, NY, US, Columbus, OH, US, Remote)
• Senior Backend Engineer (New York, NY, US, Columbus, OH, US, Remote)
• Backend Engineer (New York, NY, US, Columbus, OH, US, Remote)

Parity

• Several Rust Engineering Positions Available (Remote/Berlin/Lisbon/UK)

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

Quote of the Week

It is worth remembering that there is an infinitely large set of programs but a very small set of useful programs. A programming language is a form of ad-hoc compression algorithm, it is intended to sort the set of useful programs to have shorter encodings than the undesirable ones. Programs with certain categories of error or security vulnerability should be harder or impossible to express.

– david_chisnall on lobste.rs

Thanks to Anton Fetisov 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