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 an email! 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

• Security Advisory for crates.io, 2016-08-15. Please read, especially if you've renamed your GitHub account.
• Shape of errors to come. A sneak peek at new & improved error formats in Rust.
• What’s new with “The Rust Programming Language”? Second edition of TRPL book is coming up with Carol (Nichols || Goulding) as a co-author.
• Zero-cost futures in Rust. futures-rs is now ready for prime time!
• Futures in Rust. Writing an Async Web API Wrapper - An excercise in learning Rust.
• Rust compiler walk-through: Introduction.
• Asynchronous servers in Rust. Using tokio-rs to build an asynchronous server.
• Parsing strategies in Rust. Comparing two competing parsing frameworks in Rust: nom, a parser combinator, and LALRPOP, an LR(1) parser generator.
• Xero and Sandstorm.io have been added to the Friends of Rust page. Xero is using Rust for infrastructure, and Sandstorm.io has a collections application in Rust.

New Crates & Project Updates

• error-chain 0.5.0 released, changing how backtraces are handled.
• rust-skeptic 0.6.1 released, with fixes and optimizations.
• The official nano-config repo is undeprecated. It now contains a configuration that is compatible with older versions of the editor.
• Way Cooler. Customizable Wayland compositor (window manager) written in Rust.
• ring. Safe, fast, small crypto using Rust.
• ralloc. A fast & memory efficient pure-Rust memory allocator.
• Threshold Secret Sharing. A pure-Rust implementation of various threshold secret sharing schemes.
• WS-RS. Lightweight, event-driven WebSockets for Rust.
• alexa-rs. Rust library for building Alexa skills.
• Tantivy. A text search engine library written in Rust.
• filters - a crate for building predicates/filters with the builder pattern.
• derive_builder. Derive builder implementation for Rust structs.
• This week in Servo 74.
• This week in Rust docs 17.
• TiKV weekly 2016-08-12.
• Talking Tock week 1. Tock is a safe, multitasking operating system for low-power, low-memory microcontrollers.
• Talking Tock week 2.
• What's coming up in imag 13.

Crate of the Week

This week's Crate of the Week is Raph Levien's font-rs, yet another pure Rust font renderer, which is incomplete, but very fast. Thanks StefanoD for the suggestion.

Submit your suggestions 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.

• [moderate] rust-www: Add a section to the front page with 3 rotating 'friends'. This is an important change to how we present Rust that everybody will see.
• [easy] rust: Error code list which need to be updated to new format.
• [easy] servo: Do not define Pipeline::setup_common when on Windows.
• [easy] rustup: Don't capture backtraces without RUST_BACKTRACE=1. An easy fix, done in two steps, first modifying error-chain, then upgrading it in rustup.
• [easy] rustup: Add command to install shell completions.
• [moderate] rust: improve error message when resolution via Deref actually required DerefMut. Good first type system bug.
• [hard] imag: implement bindings to lua/lisp (ketos)/rhai for the filter library

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

Updates from Rust Core

135 pull requests were merged in the last two weeks.

• impl trait in return type position Yay! @eddyb, you're a hero!
• It is now an error to use private items in public code (formerly a warning)
• Also, private_in_public checker now substitutes type aliases
• --test-threads=N argument for tests
• Slow test warning
• Extend MIR to emit LLVM lifetime statements
• MIR: new statement kind for enum deaggregation
• Incremental Compilation: Fixed some ICEs
• Strict Version Hashes for Crates improved
• Improved {H,C}ashing for dep-graphs
• Some artificial restrictions regarding zero-sized structs/enum variants lifted (RFC 1506)
• std::vec::intoIter::as_<mut_>slice()
• Optimize std::panic::catch_unwind(_) slightly (don't use it anyway unless you have to)
• impl From for {

https://this-week-in-rust.org/blog/2016/08/16/this-week-in-rust-143/