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

Official

• Follow-up on the moderation issue

Foundation

• Take the State of Rust Survey
• Member Spotlight: Spectral

Project/Tooling Updates

• Zellij 0.23.0 released with new collaboration features
• SixtyFPS (GUI crate): Changelog for 19th of December 2021
• You can now buy Black Hat Rust with PayPal, Apple Pay & Google Pay
• This week in Databend #21: an elastic and reliable cloud warehouse
• This week in Fluvio #17: the programmable streaming platform
• Announcing Tokio Console 0.1
• Rust Analyzer Changelog #108
• IntelliJ Rust Changelog #162
• GCC Rust in 2021

Observations/Thoughts

• Contexts and capabilities in Rust
• Stop Whining about Rust Hype - A Pro-Rust Rant
• Thread Safety in C++ and Rust
• Rust in Production: Astropad
• Unbuffered I/O Can Make Your Rust Programs Much Slower
• [video] Safe && Portable Data Structure Design (10 minute lightning talk)

Rust Walkthroughs

• Cross-compiling Rust Lambdas on macOS without Docker
• A Beginner's Guide to Parsing in Rust
• Building a CEDICT parser in Rust with Nom
• [DE] Ferris Talk #4: Asynchrone Programmierung in Rust
• [ZH] 「Pin 三部曲」第二部之 《Rust Pin 进阶

Miscellaneous

• TypeVille Call for Papers (ends 9th of January 2022)
• Homegrown rendering with Rust
• [audio] SE-Radio: Tim McNamara on Rust 2021 Edition
• [video] Web api benchmarking: Rust (Warp) vs Rust (actix-web)
• [PT] Olá e seja bem vindo a outra edição de esta semana em: Rust! #420 (08/12/2021). 🌟

Crate of the Week

This week's crate is kajiya, an experimental real-time global illumination renderer made with Rust and Vulkan.

llogiq is pretty pleased with himself for this 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.

• diesel-rs - Documentation improvements

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

Updates from the Rust Project

340 pull requests were merged in the last week

• add user seed to -Z randomize-layout
• improve suggestion to change struct field to &mut
• suggest to specify a target triple when lang item is missing
• tweak errors coming from for-loop, ? and .await desugaring
• show the unused type for unused_results lint
• recover on invalid operators <> and <=>
• perf: manually implement Hash for DefId
• enable #[thread_local] for all windows-msvc targets
• add entry_ref API to HashMap
• add [T]::as_simd(_mut)
• add BinaryHeap::try_reserve and BinaryHeap::try_reserve_exact
• add io::Error::other
• avoid sorting in hash map stable hashing
• constify (most) Option methods
• constify bool::then{,_some}
• make MaybeUninit::zeroed const
• mark defaulted PartialEq/PartialOrd methods as const
• optimize vec::retain performance
• readd track_caller to Result::from_residual
• stabilize destructuring_assignment
• stabilize iter::zip
• stabilize asm! and global_asm!
• remove P: Unpin bound on impl Stream for Pin
• futures: add StreamExt::count method
• futures: limit FuturesUnordered max value of yield_every
• cargo: detect filesystem loop during walking the projects
• cargo: display alias target on 'cargo help `
• rustdoc: fix source code page sidebar on mobile
• clippy: add unnecessary_to_owned lint
• clippy: don't emit return_self_not_must_use lint if Self already is marked as #[must_use]
• clippy: ensure that return_self_not_must_use is not emitted if the method already has #[must_use]
• clippy: fix SAFETY comment tag casing in undocumented_unsafe_blocks
• rustfmt: prevent duplicate comma when formatting struct pattern with ".."

Rust Compiler Performance Triage

Unfortunately a change introduced in rust-lang/rust#89836 has made performance across different compiler artifacts much more variable by embedding compiler version information (including a git commit hash) in demangled symbol names. This means that even if two compiler artifacts are built from the same exact source code (with only the git commit changed), the compiler will have slightly different performance characteristics. This makes comparisons across pull requests virtually impossible.

The compiler team is still deciding what to do to handle this, but in the mean time, performance testing is largely broken. This issue is currently being tracked inrust-lang/rustc-perf#1126.

Triage done by @rylev. Revision range: 404c847..3d57c61

2 Regressions, 2 Improvements, 23 Mixed; 9 of them in rollups 38 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:

• Thread local Cell methods.

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 new RFCs entered Final Comment Period this week.

Tracking Issues & PRs

• [disposition: merge] Add UnwindSafe to Once
• [disposition: merge] Allow reverse iteration of lowercase'd/uppercase'd chars

New RFCs

• No new RFCs were published this week.

Upcoming Events

Rusty Events between 12/22/2021 - 1/15/2022 🦀

Online

• December 23, 2021 | Stuttgart, DE | Rust-Meetup | Rust Community Stuttgart
• December 28, 2021 | Dallas, TX, US | Dallas Rust - Last Tuesday | Dallas Rust
• January 5, 2022 | Indianapolis, IN, US | Indy.rs - with Social Distancing | Indy Rust
• January 6, 2022 | Nürnberg, DE | Rust Nürnberg online #8| Rust Nuremberg
• January 8, 2022 | Various cities | Rust GameDev Monthly Meetup | Rust GameDev
• January 11, 2022 | Seattle, WA, US | Monthly meetup | Seattle Rust Meetup
• January 12, 2022 | Boulder, CO, US | Monthly Meetup | Boulder Elixir and Rust
• January 12, 2022 | Los Angeles, CA, US | Live Coding Session - Mob Programming a Rust Code Kata [Virtual] Jan. 2022 | Rust Los Angeles
• January 12, 2022 | Stuttgart, DE | Rust-Meetup | Rust Community Stuttgart

North America

• January 6, 2022 | Austin, TX, US | Rust Lunch | Rust ATX
• January 12, 2022 | Atlanta, GA, US | Grab a beer with fellow Rustaceans | Rust Atlanta
• January 13, 2022 | Columbus, OH, US | Monthly Meeting | Columbus Rust Society

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

Astropad

• Software Engineering Manager (Remote North America time zones)

Timescale

• Senior Rust/C/C++ Engineer, Database Toolkit (Remote (UTC-8 to UTC-5)

Tangram

• Rust Developer (Remote)

Kraken

• Backend Engineer - Rust - Core Backend (Remote)
• Backend Engineer, Kraken Futures - Rust (Remote)
• Senior Rust Engineer - Banking (Remote)

Parity Technologies

• Rust Core Engineer - Solidity Compiler (Solang) (Remote)
• Rust Core Engineer - Smart Contract Platform (Remote)
• Multiple other Rust / Blockchain Engineering positions

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

Quote of the Week

Important crab-related diagnostics improvement shipping in nightly @rustlang

error: Ferris cannot be used as an identifier --> src/main.rs:2:9 | 2 | let 🦀 = 123; | ^^ help: try using their name instead: `ferris` 3 | 4 | for i in 0..🦀 { |

– Mara Bos on twitter

Thanks to Julian Wollersberger 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