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

News & Blog Posts

• MIR-based borrow check (NLL) status update.
• Divans: Open source compression in Rust from Dropbox using threads, SIMD with a WASM demo in the browser.
• Integration tests. Part of the series Writing an OS in Rust.
• From ActiveRecord to Diesel.
• Building a Diesel project on GitLab CI.
• A trick for test maintenance.
• Running Rust on the GPU with Accel.
• Rust on LPC82x microcontrollers using lpc82x-hal.
• Why Rust's async functions should use the outer return type approach.
• aturon.log: listening and trust, part 3.
• This week in Rust and WebAssembly 3.
• [podcast] Rusty Spike Podcast - episode 33. Crossbeam channels, actix benchmarks (and how to use it), qt, servo, gfx-portability, debian, OS development, LibOS, and a new book.

Crate of the Week

This week's crate is SIMDNoise, a crate to use modern CPU vector instructions to generate various types of noise really fast. Thanks to gregwtmtno 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.

• Help Rust Language Server get to 1.0.
• Get started with these beginner-friendly issues.

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

Updates from Rust Core

66 pull requests were merged in the last week

• rustc_codegen_llvm: don't treat i1 as signed, even for #[repr(i8)] enums
• rustdoc: process cross-crate glob re-exports
• Stabilize #[repr(transparent)]
• libstd: add an RAII utility for sys_common::mutex::Mutex
• Don't auto-hide inherent impls even if rustdoc-collapse == true
• Add Ref/RefMut::map_split method
• Improve memoization and refactor NLL type check
• refactor: create multiple HIR items for imports
• Speed up obligation forest code
• impl Hash for !
• Stabilize GlobalAlloc and #[global_allocator]
• Replace core::iter::AlwaysOk<T> by Result<T, !>
• Stabilize std::path::Path::ancestors
• Add error message for using >= 65535 hashes for raw string literal escapes

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

• [disposition: merge] Add Option::replace to the core library.

Tracking Issues & PRs

• [disposition: merge] Tracking issue for the to_bytes and from_bytes methods of integers.
• [disposition: merge] Tracking issue for RFC 554: pattern_parentheses feature.
• [disposition: merge] Tracking issue for ToOwned::clone_into (toowned_clone_into).
• [disposition: merge] Tracking issue for "macro naming and modularisation" (RFC #1561).
• [disposition: merge] Tracking issue for promoting ! to a type (RFC 1216).
• [disposition: merge] Loosened rules involving statics mentioning other statics.
• [disposition: merge] Implement PartialEq between &str and OsString.
• [disposition: merge] Undeprecate thread::sleep_ms.

New RFCs

• Clippy 1.0.
• Signing registry index commits.
• Add the group_by and group_by_mut methods to slice.
• Add delete and delete_by methods to Iterator.
• Accept semicolons as items.
• Update RFC 0430 to allow underscores between numbers in CamelCase names.

Upcoming Events

Online

• Jun 27. Rust Community Team Meeting at #rust-community on irc.mozilla.org.
• Jul 3. Rust Community Content Subteam Meeting at #rust-content on irc.mozilla.org.
• Jul 4. Rust Community Team Meeting at #rust-community on irc.mozilla.org.
• Jul 4. Rust Events Team Meeting.

Africa

• Jul 3. Johannesburg, ZA - Monthly Meetup of the Johannesburg Rustaceans.

Europe

• Jun 21. Cambridge, GB - Cambridge Rust Meetup.
• Jun 27. Berlin, DE - OpenTechSchool - Rust Hack and Learn.
• Jun 27. Cologne, DE - Rust Cologne at ThoughtWorks.
• Jun 27. Milan, IT - Perché non compila?
• Jul 6. Darmstadt, DE - Rhein-Main Rust Meetup.

North America

• Jun 24. Mountain View, US - Open Table / Icebreaker: what projects are you working on.
• Jun 25. Durham, US - Triangle Rustaceans.
• Jun 26. Dallas, US - Last Tuesday Meetup.
• Jun 26. New York City, US - Procedural Macros - parse JSX using nom.
• Jun 27. Vancouver, CA - Rust Study/Hack/Hang-out night.
• Jun 28. San Francisco, US - Rust Bay Area - [Mozilla] GUI in Rust and Chalk.
• Jul 1. Mountain View, US - Open Table / Icebreaker: what projects are you working on.
• Jul 4. Atlanta, US - Grab a beer with fellow Rustaceans.
• Jul 4. Indianapolis, US - Indy.rs.
• Aug 17. Portland, US - RustConf 2018. Registration is now open.

If you are running a Rust event please add it to the calendar to get it mentioned here. Email the Rust Community Team for access.

Rust Jobs

• Rust Developer at 1aim, Berlin.

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

Quote of the Week

In Rust it’s the compiler that complains, with C++ it’s the colleagues

– Michal 'Vorner' Vaner on gitter

(selected by llogiq per one unanimous vote)

Please submit your quotes for next week!

This Week in Rust is edited by: nasa42 and llogiq.