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

• [Inside] Exploring PGO for the Rust compiler

Newsletters

• This Month in Rust OSDev (October 2020)
• This Month in Rust GameDev #15 - October 2020

Tooling

• Rust-Analyzer Changelog #50
• Develop & Debug Your Rust Application Top Of Kubernetes With OKteto

Observations/Thoughts

• Rust Ray Tracer, an Update (and SIMD)
• Rust emit=asm Can Be Misleading
• A survey into static analyzers configurations: Clippy for Rust, part 1
• Why Rust is the Future of Game Development
• Rust as a productive high-level language
• 40 millisecond bug
• Postfix macros in Rust
• A Quick Tour of Trade-offs Embedding Data in Rust
• Why Developers Love Rust

Rust Walkthroughs

• Make a Language - Part Nine: Function Calls
• Building a Weather Station UI
• Getting Graphical Output from our Custom RISC-V Operating System in Rust
• Build your own: GPG
• Rpi 4 meets Flutter and Rust
• AWS Lambda + Rust
• Orchestration in Rust
• Rocket Tutorial 02: Minimalist API
• Get simple IO stats using Rust (throughput, ...)
• Type-Safe Discrete Simulation in Rust
• [series] A Gemini Client in Rust
• Postfix macros in Rust
• Compilation of Active Directory Logs Using Rust
• [FR] The Rust Programming Language (translated in French)

Project Updates

• New doc comment handling in rustdoc

Miscellaneous

• Rust vs Go
• Learn Assembly by Writing Entirely Too Many Brainf*ck Compilers in Rust

Crate of the Week

This week's crate is postfix-macros, a clever hack to allow postfix macros in stable Rust.

Thanks to Willi Kappler 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!

Some of these tasks may also have mentors available, visit the task page for more information.

• time-rs: The call to localtime_r may be unsound

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

Updates from Rust Core

333 pull requests were merged in the last week

• Implement destructuring assignment for tuples
• reverse binding order in matches to allow the subbinding of copyable fields in bindings after @
• Fix unreachable sub-branch detection in or-patterns
• Transform post order walk to an iterative approach
• Compile rustc crates with the initial-exec TLS model
• Make some std::io functions const
• Stabilize Poll::is_ready and is_pending as const
• Stabilize hint::spin_loop
• Simplify the implementation of Cell::get_mut
• futures: Add StreamExt::cycle
• futures: Add TryStreamExt::try_buffered
• cargo: Avoid some extra downloads with new feature resolver

Rust Compiler Performance Triage

• 2020-11-10: 1 Regression, 2 Improvements, 2 mixed

A mixed week with improvements still outweighing regressions. Perhaps the biggest highlight was the move to compiling rustc crates with the initial-exec TLS model which results in fewer calls to _tls_get_addr and thus faster compile times.

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

No RFCs are currently in the final comment period.

Tracking Issues & PRs

• [disposition: merge] Stabilize clamp
• [disposition: merge] [android] Add support for android's file descriptor ownership tagging to libstd.
• [disposition: merge] Implement Error for &(impl Error)
• [disposition: merge] Add checking for no_mangle to unsafe_code lint
• [disposition: merge] Tracking issue for methods converting bool to Option<T>

New RFCs

• User/ardavis/checked cfg
• add const-ub RFC
• Adds must_not_await_lint RFC

Upcoming Events

Online

• November 12, Berlin, DE - Rust Hack and Learn - Berline.rs
• November 12, Washington, DC, US - Mid-month Rustful—How oso built a runtime reflection system for Rust - Rust DC
• November 12, Lehi, UT, US - WASM, Rust, and the State of Async/Await - Utah Rust
• November 18, Vancouver, BC, CA - Rust Study/Hack/Hang-out night - Vancouver Rust
• November 24, 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

• 2 Backend engineers, Core Banking at Truelayer (Milan, IT), also contact Luca Palmieri

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

Quote of the Week

There are no bad programmers, only insufficiently advanced compilers

– Esteban Kuber on twitter

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