Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. 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



Project/Tooling Updates


Rust Walkthroughs


Crate of the Week

This week's crate is tap, a library with extension traits to provide suffix-position pipeline behavior.

Thanks to David Mason for the suggestion!

Please 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.

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

Updates from the Rust Project

286 pull requests were merged in the last week

Rust Compiler Performance Triage

A week of mostly rather small changes with many regressions being hard to diagnose. The largest regression comes from the introduction of a new future (desugaring .await into a call to IntoFuture::into_future). This was deemed acceptable as it only seems to have a negative impact in stress test situations where async/await is used more than one would normally expect. Unfortunately this does mean regressions beat out improvements this week.

Triage done by @rylev. Revision range: 1c0287..ecb65b

3 Regressions, 5 Improvements, 5 Mixed; 3 of them in rollups 31 comparisons made in total

Full report here

Approved RFCs

Changes to Rust follow the Rust RFC (request for comments) process. These are the RFCs that were approved for implementation 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.


  • No RFCs entered final comment period this week.

Tracking Issues & PRs

New RFCs

Upcoming Events

Rusty Events between 12/01-12/15 🦀


North America


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

Rust Jobs




Bionaut Labs


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

Quote of the Week

v2 of the patch-series "to add support for Rust as a second language to the Linux kernel" was posted to LKML [..]

There have been several improvements to the overall Rust support since RFC and v2 described in the linked mail.

Thorsten Leemhuis on twitter

llogiq unanimously suggested and voted that this be our quote for this week.

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, cdmistman, ericseppanen, extrawurst, andrewpollack, U007D, kolharsam, joelmarcey, mariannegoldin.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust