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.

This week's edition was edited by: nasa42, brson, and llogiq.

Updates from Rust Community

News & Blog Posts

• Announcing Diesel — A safe, extensible ORM and query builder for Rust.
• Where are you From::from, And what have you turned Into::into? When and for what to use From and Into traits.
• Experimenting with Rust.
• Language of the month: Rust.
• Macro hygiene in all its guises and variations.
• Macro plans, overview. An overview of the changes that Nick plans to propose for the macro system.
• Parser Combinators: The road to Chomp 0.1.

Notable New Crates & Projects

• Diesel. A safe, extensible ORM and Query Builder for Rust.
• Chomp. Fast parser combinator library for Rust.
• libkeccak-tiny. A tiny implementation of SHA-3, SHAKE, Keccak, and sha3sum in Rust.
• Waitout. Simple interface for tracking and awaiting the completion of multiple asynchounous tasks.

Updates from Rust Core

69 pull requests were merged in the last week.

See the triage digest and subteam reports for more details.

Notable changes

• Make unreachable_code lint warn on diverging call arguments as well.
• Rename #[deprecated] to #[rustc_deprecated].
• Add rustc UX guidelines.
• Fix various bugs around empty structs and patterns.
• Update bash-completion.
• Add suggestion of similar macro names to macro undefined error message.
• Split rustc::metadata to a rustc_metadata crate.
• Remove #[staged_api].

New Contributors

• androm3da
• ebadf
• Ivan Stankovic
• Jack Fransham
• Jeffrey Seyfried
• Josh Austin
• Kevin Yeh
• Matthias Bussonnier
• Philipp Matthias Schäfer
• xd1le

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 1252: Document and expand the open options.

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:

• Add a IndexAssign trait that allows overloading "indexed assignment" expressions like a[b] = c.
• Allow eliding more type parameters.
• Add thread-local custom panic handlers to customize the behavior of thread panics.
• Allow a custom panic handler.
• Add an alias attribute to #[link] and -l.

New RFCs

• Change thread local variables to only accept async-signal-safe types.
• Amend RFC 550 with (expanded) abstract specification rather than algorithm.

Upcoming Events

• 12/1. Rust Sydney Meetup.
• 12/2. Boston: Concurrency in Rust Tutorial.
• 12/8. San Diego Rust Meetup.
• 12/9. RustBerlin Hack and Learn.
• 12/11. Rhein-Main Area Rust Meetup.
• 12/14. Seattle Rust Meetup.

If you are running a Rust event please add it to the calendar to get it mentioned here. Email Erick Tryzelaar or Brian Anderson for access.

fn work(on: RustProject) -> Money

• Research Engineer - Servo at Mozilla.
• Senior Research Engineer - Rust at Mozilla.
• Open Source Software Engineer at MaidSafe.
• Software Engineer - Sensor Development at IronNet Cybersecurity.

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

Crate of the Week

This week's Crate of the Week is Chrono, a crate that offers very handy timezone-aware Duration and Date/Time types.

Thanks to Ygg01 for the suggestion. Submit your suggestions for next week!