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

I made a game in Rust.
Achieving warp speed with Rust. Rust code performance tips.
Two years of Rust. From Rust's official blog.
Two years of Rust.
Going to the edge of space safely, with OpenStratos and Rust.
The story of a Rust bug — a trip down a rabbit hole.
Implementing an atomic hash table in Rust.
Mentally modelling Rust modules.
How to write build.rs scripts properly.
Rust on AVR: Beyond blinking. AVR is a family of 8-bit microcontrollers.
Implementing an E-Ink clock controlled by an ARM microcontroller (LPC1227) in Rust.
Writing a GitHub webhook with Rust! Part 1: Rocket.
Rust FFI: Sending strings to the outside world.
A simple Rust memory management overview.
Cheatsheet for Future combinators.
All Rustfest Kyiv 2017 talks are now online.
nom 3.0 is released.
This week in Rust docs 56.
This week in Servo 102.

Crate of the Week

This week's crate of the week is PX8, a Rust implementation of an Open Source fantasy console. Thanks to hallucino 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.

Rust libz blitz status update 2017-05-12. 11 issues were closed last week and 8 new cookbook examples added. This week, the libz blitz is in need of someone to lead the walkdir evaluation.
rust-url is looking for maintainers.
rust: Get test suite working with wasm.
[easy] rust-cookbook: Switch error handling setup to quick_main! macro from error-chain.
rustup: Optimize disk access during install.
rustup: Improve error message when override doesn't exist.
[easy] rustup: Use ShellExecute to open docs on windows.
[easy] rustup: No info printed on rustup target remove.
[easy] rustup: rustup tries to sync channel updates for non-updatable channels.
[easy] rustup: Windows confirmation prompt not disabled with -y.
[easy] rustup: Please show me the version I'm downloading/updatin.
[easy] rustup: target add and component add should succeed if target/component is already installed.
rustup: Build with panic=abort.
rustup: zero exit code on failing rustup update.
rustup: Teach rustup/rustbuild about optional components.
rustup: Support dependencies between optional components/extensions.
[easy] rusoto: SQS: bring back integration tests. Rusoto is an AWS SDK for Rust.
[easy] quackin: Better documentation for the recommender module. Quackin is a recommender systems framework for Rust.
[easy] quackin: Item based recommender.
[medium] quackin: Benchmarks for recommenders.
[easy] quackin: Support similarities like Jaccard and Pearson correlation.
[medium] quackin: Performance metrics like Precision, Recall, RMSE and MAE.

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

Updates from Rust Core

125 pull requests were merged in the last week.

New Contributors

Bastien Orivel
Dennis Schridde
Eduardo Pinho
faso
Liran Ringel

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 1849: Remove static bound from type_id.

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. This week's FCPs are:

[disposition: merge] Specify #[repr(transparent)].
[disposition: close] Add Cargo post-build scripts.
[disposition: close] Reject crates.io uploads which declare a feature named no_std.
[disposition: merge] Expand and stabilize impl Trait.
[disposition: close] Allow any Displayable type for expect.
[disposition: merge] Make RangeInclusive just a two-field struct (amend 1192).

New RFCs

Const generics.

Style RFCs

Style RFCs are part of the process for deciding on style guidelines for the Rust community and defaults for Rustfmt. The process is similar to the RFC process, but we try to reach rough consensus on issues (including a final comment period) before progressing to PRs. Just like the RFC process, all users are welcome to comment and submit RFCs. If you want to help decide what Rust code should look like, come get involved!

We're making good progress and the style is coming together. If you want to see the style in practice, check out our example or use the Integer32 Playground and select 'Proposed RFC' from the 'Format' menu. Be aware that implementation is work in progress.

Issues in final comment period: