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. If you find any errors in this week's issue, please submit a PR.

Updates from Rust Community

Foundation

• Share Your Thoughts on the “State of Rust” in 2022

Newsletters

• Rust Nigeria Newsletter - Happy Holidays!

Project/Tooling Updates

• This Month in hyper: November 2022
• IntelliJ Rust Changelog #184
• rust-analyzer changelog #158
• This Week in Fyrox
• GCC Rust Front-End v4 Posted - Now Cleared For Merging In GCC 13
• What's new in Seaography 0.3.0
• Fornjot (code-first CAD in Rust) - Weekly Release
• Helix editor 22.12 released

Observations/Thoughts

• Embedded Rust & Embassy: PWM Generation
• Self-referential types for fun and profit
• Parsing numbers into base-10 decimals with SIMD
• How much does Rust's bounds checking actually cost?
• What Every Rust Developer Should Know About Macro Support in IDEs
• [video] High Performance Rust UI

Rust Walkthroughs

• Introduction to Rust: Writing an HTTP CLI client
• Hacking Bluetooth to Brew Coffee from GitHub Actions: Part 1 - Bluetooth Investigation

Miscellaneous

• Rust Axum/Vue WebSocket Demo
• Advent of Code 2022
• Memory Safe Languages in Android 13
• The book "Rust Web Development" (Manning) is released

Crate of the Week

This week's crate is zeroize, a crate to securely clear secrets from memory either manually or on drop, with both methods for your types being but one #[derive] away.

Thanks to Tally 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.

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

Updates from the Rust Project

339 pull requests were merged in the last week

• remove drop order twist of && and || and make them associative
• rustc_ast_lowering:stop lowering imports into multiple items
• avoid Invalid code suggested when encountering unsatisfied trait bounds in derive macro code
• don't add a note for implementing a trait if its inner type is erroneous
• don't elide type information when printing E0308 with -Zverbose
• don't suggest associated function call for associated const
• restore use suggestion for dyn method call requiring Sized
• some initial normalization method changes
• suggest to use . instead of :: when accessing a method of an object
• implement should_continue in chalk-recursive
• miri: refactor scheduler
• rewrite LLVM's archive writer in Rust
• cheaper dump_mir
• allow to feed a value in another query's cache
• attribute cleanups
• also cache the stable hash of interned Predicates
• merge generics and where predicates and prevent duplicates in where predicates
• adjust inlining attributes around panic_immediate_abort
• ensure query backtraces work for DefIds created after ast lowering
• add type_ascribe! macro as placeholder syntax for type ascription
• stabilize nonzero_bits
• make VecDeque::new_in unstably const
• send VecDeque::from_iter via Vec::from_iter
• add PathBuf::as_mut_os_string and Path::as_mut_os_str
• implement TcpStream shutdown for wasm32-wasi
• create a hacky fail-fast mode that stops tests at the first failure
• cargo: aware of compression ratio for unpack size limit
• cargo: improve file found in multiple build targets warning
• rustdoc-Json: don't inline foreign traits
• clippy: comparison_to_empty: peel derefs in suggestions
• clippy: manual_let_else:keep macro call on suggestion blocks
• clippy: don't cross contexts while building the suggestion for redundant_closure_call
• clippy: don't lint explicit_auto_deref when the initial type is neither a reference, nor a receiver
• clippy: don't lint from_over_into for opaque types
• clippy: don't lint implicit_clone when the type doesn't implement clone
• clippy: don't lint manual_assert in else if
• clippy: don't lint string_lit_as_bytes in match scrutinees
• clippy: don't lint unnecessary_cast in mixed macro context
• clippy: don't lint unnecessary_operation in mixed macro contexts
• clippy: don't suggest removing mut from references in redundant_static_lifetimes
• clippy: fix ICE in unnecessary_to_owned
• clippy: fix ICE in result_large_err with uninhabited enums
• clippy: fix ICE in unused_rounding
• clippy: fix manual_let_else producing a wrong suggestion with or-patterns
• clippy: fix unnecessary_cast suggestion when taking a reference
• clippy: move index_refutable_slice to pedantic
• clippy: move unnecessary_unsafety_doc to pedantic
• rust-analyzer: add move_const_to_impl assist
• rust-analyzer: implement vararg parameter type inference
• rust-analyzer: fix signature help not showing up when cursor is between )) or >>

Rust Compiler Performance Triage

A mixed bag of a week. 2 of the 3 regressions are connected to changes to the query system that underlies incremental compilation. The third regression is still being investigated. For all three, the impact on cycle counts that are within our noise tolerance levels There were several small-ish improvements, though PR #104963 is worth calling out: a well-factored change to how we lower the AST into HIR that had a broad positive impact. One final note: the summary-opt max-rss seems to gone up by 1.5% over the past month (perf), via a gradual climb; just something to keep our eyes on going forward.

Triage done by @pnkfelix. Revision range: 8a09420a..9db224fc

See the full report for details.

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.

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation this week:

• Style evolution

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 DerefMut for PathBuf
• [disposition: merge] Find the right lower bound region in the scenario of partial order relations

New and Updated RFCs

• [new] Relax const-eval restrictions

Upcoming Events

Rusty Events between 2022-12-07 - 2023-01-04 🦀

Virtual

• 2022-12-07 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2022-12-07 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-12-08 | Virtual (Nürnberg, DE) | Rust Nuremberg
  • Rust Nürnberg online #20
• 2022-12-08 | Virtual (San Francisco, CA, US) | Data + AI Online Meetup
  • D3L2: The Genesis of Delta Rust with QP Hou
• 2022-12-10 | Virtual | Rust GameDev
  • Rust GameDev Monthly Meetup
• 2022-12-13 | Virtual (Dallas, TX, US) | Dallas Rust
  • Second Tuesday
• 2022-12-13 | Virtual (Rostock, DE) | Altow Academy
  • Rust Meetup Rostock
• 2022-12-13 | Virtual (Saarbrücken, DE) | Rust-Saar
  • Meetup: 25u16
• 2022-12-14 | Virtual (Boulder, CO, US) | Boulder Elixir and Rust
  • Monthly Meetup
• 2022-12-24 | Virtual (Linz, AT) | Rust Linz
  • Rust Meetup Linz - 28th Edition
• 2022-12-14 | Virtual (México City, MX) | Rust MX
  • Rust y Arduino
• 2022-12-15 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup
• 2022-12-20 | Virtual (Berlin, DE) | Berlin.rs
  • Rust Hack and Learn
• 2022-12-20 | Virtual (Washington, DC, US) | Rust DC
  • Mid-month Rustful
• 2022-12-21 | Virtual (Vancouver, BC, CA) | Vancouver Rust
  • Show & Tell: Tableturf
• 2022-12-27 | Virtual (Dallas, TX, US) | Dallas Rust
  • Last Tuesday
• 2023-01-03 | Virtual (Buffalo, NY, US) | Buffalo Rust Meetup
  • Buffalo Rust User Group, First Tuesdays
• 2023-01-04 | Virtual (Indianapolis, IN, US) | Indy Rust
  • Indy.rs - with Social Distancing
• 2023-01-04 | Virtual (Stuttgart, DE) | Rust Community Stuttgart
  • Rust-Meetup

Asia

• 2022-12-29 | Tel Aviv, IL | Rust TLV
  • December Edition - xtask, macros and low level features

Europe

• 2022-12-07 | Cologne, DE | Rust Cologne
  • Advent of Rust 1.65
• 2022-12-07 | Zurich, CH | Rust Zurich
  • Next generation i18n with rust (icu4x) and zero-copy deserialization
• 2022-12-14 | Trondheim, NO | Rust Trondheim
  • Rust Advent of Code hackathon
• 2022-12-15 | Stuttgart, DE | Rust Community Stuttgart
  • OnSite Meeting

North America

• 2022-12-08 | Columbus, OH, US | Columbus Rust Society
  • Monthly Meeting
• 2022-12-14 | Austin, TX, US | Rust ATX
  • Rust Lunch
• 2022-12-20 | San Francisco, CA, US | San Francisco Rust Study Group
  • Rust Hacking in Person
• 2022-12-27 | Austin, TX, US | ATX Rustaceans
  • Atx Rustaceans Meetup

Oceania

• 2022-12-09 | Melbourne, VIC, AU | Rust Melbourne
  • December 2022 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

To date, there have been zero memory safety vulnerabilities discovered in Android’s Rust code.

– Jeffrey Vander Stoep on the google security team blog

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, bennyvasquez.

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Discuss on r/rust