Hello and welcome to another issue of This Week in Rust! Rust is a systems language pursuing the trifecta: safety, concurrency, and speed. 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

• Announcing Rust 1.47.0

Newsletters

• This Month in Rust GameDev #14

Tooling

• Rust Analyzer Changelog #46
• Two videos about rust code coverage in VSCode

Observations/Thoughts

• Rust after the honeymoon
• Building the Fastest RaptorQ (RFC6330) Codec in Rust
• Learning Rust through open source and live code reviews
• My Mistakes Making a Canvas Based Game with Rust and WebAssembly
• A New Backend for Cranelift, Part 1: Instruction Selection
• Optional parameters in Rust
• Building an async-compatible actor system
• [video] Contract as Code as Contract: Using Rust to Unify Specification and Implementation

Learn Simple Rust

• Iterators in Rust
• Learn Rust by building the game Snake
• That's so Rusty! Fearless concurrency
• Making a Simple Calculator in Rust
• Patterns of fallible iteration
• [video] Learn Rust Together Part 5: Structs and Enums!
• [video] 3. #everyonecancontribute cafe: Gitpod & learning Rust

Learn More Rust

• Deploying a Rust HTTP server to DigitalOcean App Platform
• Make A Language - Part Eight: Function Definitions
• Supercharge your Electron apps with Rust
• [ZH] Build a Shoot 'em up game with framework Amethyst
• [video] Rust FFI: Microsoft Flight Simulator SDK Part 1
• [video] Fuzz Testing popular Rust library in 5 min using cargo-fuzz / libfuzzer

Project Updates

• Rust in Curl with Hyper
• Memory Safe 'curl' for a More Secure Internet
• Version 0.7 of calloop

Miscellaneous

• Collect in Rust, Traverse in Haskell and Scala
• Proving that 1 + 1 = 2 in Rust
• What should I program?
• Getting back to C++ after Rust is a pain.

Call for Blog Posts

The Rust Core Team wants input from the community! If you haven't already, read the official blog and submit a blog post - it will show up here! Here are the wonderful submissions since the call for blog posts:

Crate of the Week

This week's crate is paste, a macro to concatenate identifiers (which would otherwise be nightly only).

Thanks to mark-i-m for the suggestion!

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!

• Create a Rust-Client for SirixDB
• the-way: Highlight parameters in shell snippet when copying
• the-way: Replace copy_to_clipboard code with arboard

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 Rust Core

409 pull requests were merged in the last week

• resolve: improve "try using the enum's variant"
• Fix LitKind's byte buffer to use refcounted slice
• Replace (Body, DefId) with Body where possible
• perf: UninhabitedEnumBranching avoid n²
• Fix span for unicode escape suggestion
• Implement advance_by, advance_back_by for iter::Chain
• Add PartialEq impls for Vec ↔ slice
• stdsimd: Use xor to implement Neg::neg for floats

Rust Compiler Performance Triage

• 2020-10-13: 0 Regressions, 3 Improvements, 3 Mixed

Overall, fairly busy week, but without major regressions that need to be addressed.

See the full report for more.

Approved RFCs

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

No RFCs were approved this week.

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

• RFC: Promote aarch64-unknown-linux-gnu to a Tier-1 Rust target
• Access to traits' associated functions and constants from trait objects

Tracking Issues & PRs

• [disposition: merge] stabilize union with 'ManuallyDrop' fields and 'impl Drop for Union'
• [disposition: merge] stop promoting union field accesses in 'const'
• [disposition: merge] passes: check_attr on more targets
• [disposition: merge] resolve: Do not put nonexistent crate meta into prelude
• [disposition: postpone]Tracking issue for experiments around coercions, generics, and Copy type ergonomics

New RFCs

Upcoming Events

Online

• Octover 15. Berlin, DE - Rust Hack and Learn - Berline.rs
• October 20. Denver, CO, US - Rust Denver - Data Science with Rust
• October 21. New York, NY, US - A Journey into the Nucleus at Dropbox with Parker Timmerman - Rust NYC
• October 21. Vancover, BC, CA - Rust Study/Hack/Hang-out night - Vancouver Rust
• October 22. Edinburgh, UK - Fluence: interface-types for server-side WebAssembly modules - Rust Edinburgh
• October 27. Dallas, TX, US - Last Tuesday - Dallas Rust

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

• Lead Software Engineer at Stake Technologies (SG, Remote)
• Software Engineer at Stake Technologies (SG, Remote)
• Service Engineer [Rust] at Narrative (Auckland, NZ - Remote within New Zealand)

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

Quote of the Week

Just because Rust allows you to write super cool non-allocating zero-copy algorithms safely, doesn’t mean every algorithm you write should be super cool, zero-copy and non-allocating.

• trentj on rust-users

Thanks to Nixon Enraght-Moony for the suggestion!

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, and cdmistman.

Discuss on r/rust