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

• The push for GATs stabilization
• [Inside] Lang team August update

Newsletters

• This Month in Rust GameDev #24 - July 2021
• This Month in Rust OSDev (July 2021)
• The Monthly Oxide #5
• Rust Module of the Week: std::fs (Part 2): Dirs, Dirs, Dirs

Project/Tooling Updates

• Rustdoc will now add Jump to Definition links in source code pages!
• rust-analyzer Changelog #89
• rust-analyzer Financial Report #3
• Whats New in IntelliJ Rust for the 2021.2 Release Cycle
• SixtyFPS weekly report for 8th of August 2021
• How do Mina nodes communicate? Implementing bin_prot in Rust
• Trunk v0.10 – v0.13
• Bevy's First Birthday
• Progress report on rustc_codegen_cranelift (July 2021)
• [upcoming] Volt - A rust-based package manager that's up to 12x faster than Yarn

Observations/Thoughts

• On Collecting Result Types in Rust
• Rust in Production: Qovery
• How to write really slow Rust code - Part 2
• Slitter: a slab allocator that trusts but verifies (in Rust, for C)
• When Zero Cost Abstractions Aren't Zero Cost

Rust Walkthroughs

• Rust cli example: Ferris fetches Go gopher postcards
• A Little Bit About PRNG Stuff
• Rust's Vector
• Interacting with data from FFI in Rust
• Loading a Rust library as a Lua module in Neovim
• Adding Rust-Stable libstd Support for Xous
• Rust BDD tests with Cucumber
• Rust cli example: Ferris fetches Go gopher postcards
• So you want to write a GUI framework
• Tauri with Standard Svelte or SvelteKit
• [JP] Rust で Web バックエンド開発をはじめる
• [video] Explaining Rust Analyzer 08: Mini Rowan, Green and Red Trees

Research

• CVE-2021-29922 – rust standard library “net” – Improper Input Validation of octal literals in rust 1.52.0 std::net and below results in indeterminate SSRF & RFI vulnerabilities.
• Retrofitting Typestates into Rust

Miscellaneous

• SIMD usage in C++, C# and RUST
• RIP 16-bit crate IDs
• Your favorite Rust CLI utility?
• Go, Rust "net" library affected by critical IP address validation vulnerability
• Microsoft Rust intro says "Rust is known to leak memory"

Crate of the Week

This week's crate is ockam, a crate to implement transport-agnostic end-to-end encryption for the rest of us.

Thanks to staticassert for the self-suggestion.

Submit your suggestions and votes for next week!

Module of the Week

Continuing Rust Module of the Week this week is std::fs Part 2: Dirs, Dirs, Dirs. Contribution and feedback welcome here.

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!

• rust-lang/this-week-in-rust - Feature request: Dark theme for the website
• Stranger6667/jsonschema-rs - Implement the uuid format validator
• Stranger6667/jsonschema-rs - Implement the duration format validator
• Stranger6667/jsonschema-rs - Option to turn off processing of the format keyword

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

324 pull requests were merged in the last week

• fill out remaining parts of C-unwind ABI
• CTFE: throw unsupported error when partially overwriting a pointer
• proc macro spans: make columns 1 based
• improve diagnostics for wrongly ordered keywords in function declaration
• replace HirIds with LocalDefIds in AccessLevels tables
• add config.toml options for enabling overflow checks in rustc and std
• use zeroed allocations in the mir interpreter instead eagerly touching the memory
• only compute is_freeze for layout-constrained ADTs
• allow generic SIMD array element type
• properly find owner of closure in THIR unsafeck
• make wrapping_neg() use wrapping_sub(), #[inline(always)]
• stabilize Vec<T>::shrink_to
• impl Default, Copy, Clone for std::io::Sink and Empty
• change environment variable getters to error recoverably
• add core::stream::from_iter
• futures: implement Default for OptionFuture
• clippy: don't emit too_many_lines for closures
• clippy: add xor case to manual swap lint

Rust Compiler Performance Triage

Quiet week for performance, with no large changes. Regressions are limited to just a few benchmarks.

Triage done by @simulacrum. Revision range: 998cfe5..3354a44

2 Regressions, 0 Improvements, 0 Mixed; 1 of them in rollups

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:

• RFC: Overconstraining and omitting unsafe in impls of unsafe trait 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 RFCs are currently in the final comment period.

Tracking Issues & PRs

• [disposition: merge] Tracking issue for UnsafeCell::raw_get

New RFCs

• RFC: let-expression

Upcoming Events

Online

• August 10, 2021, Dallas, TX, US - Second Tuesday - Dallas Rust
• August 18, 2021, Denver, CO, US - Level up our Rust skills by building an ECS by Brooks Patton - Rust Denver
• August 18, 2021, Vancouver, BC, CA - Solving LeetCode Problems with Rust - Vancouver Rust
• August 19, 2021, Manchester, UK - Rust Manchester - Speeding Up the Snake: Extending Python with Rust

North America

• August 11, 2021, Atlanta, GA, US - Grab a beer with fellow Rustaceans - Rust Atlanta

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

TrueLayer

• Associate Software Engineer - PayDirect (Milan, IT)

Xayn

• (Senior) Rust Engineer (Berlin, Germany)

ChainSafe

• Rust Developer (Remote)

Kollider

• Junior Backend Engineer (Remote)
• Senior Backend Engineer (Remote)

NZXT

• Senior Software Engineer for CAM (Remote)
• Senior Software Engineer for Streaming Software (Remote)

Kraken

• Senior Backend Engineer - Rust - Core Backend (Remote)
• Senior Banking Engineer - Rust (Remote)

Tempus Ex

• Several positions available (San Francisco, CA, US, Atlanta, GA, US, Austin, TX, US and Remote)

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

Quote of the Week

We regrettably lack nominations,
so as I can't choose fresh quotations,
at last nor this time,
I'll offer this rhyme
to quell all discombombulations.

– a very sorry llogiq

Please submit quotes and vote for next week!

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

Discuss on r/rust