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

Notable New Crates & Project Updates

Updates from Rust Core

92 pull requests were merged in the last week.

See the triage digest and subteam reports for more details.

Notable changes

New Contributors

  • Adam Badawy
  • Bhargav Patel
  • Christopher Sumnicht
  • Mihaly Barasz
  • Mika Attila
  • Ori Avtalion
  • Paul A. Jungwirth
  • Sean Griffin

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. This week's FCPs are:

New RFCs

Upcoming Events

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

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

Crate of the Week

This week's Crate of the Week is cargo-count – a neat way to summarize line counts for cargo projects.

Thanks to lizida who suggested it back in September. Submit your suggestions for next week!

Quote of the Week

The major philosophic difference between Rust today and Swift-as-I-envision-it is that Rust forces you to think about ownership everywhere, but Swift-as-I-envision-it should only force you to think about single ownership & borrowing if you want to optimize performance or guarantee that you have no encounters with the runtime.

If it helps, think of the extant Swift "inout" parameter modifier as being equivalent to "&mut", and imagine the logical swift extensions to support the rest of the Rust model.

This is a really important area for us to develop, but it also isn't the highest priority of the team. That means that Rust will maintain a lead in this area of applicability... unless someone motivated and capable from the open source community decides that it is really important to them, and makes it happen sooner.

— Chris Lattner on /r/rust.

Thanks to llogiq for the tip.

Submit your quotes for next week!