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





Rust Walkthroughs

Project Updates


Crate of the Week

This week's crate is cargo-intraconv, a cargo subcommand to convert links in rust documentation to the newly stable intra-doc-links format.

Thanks to Alexis Bourget 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.

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

Updates from Rust Core

345 pull requests were merged in the last week

Rust Compiler Performance Triage

  • 2020-11-24: 1 Regression, 2 Improvements, 2 mixed

This week saw landing of #79237 which by itself provides no wins but opens the door to support for split debuginfo on macOS. This'll eventually show huge wins as we can likely avoid re-collecting debuginfo while retaining support for lldb and Rust backtraces. #79361 tracks the stabilization of the rustc flag, but the precise rollout to stable users is not yet 100% clear.

Triage done by @jyn514 and @simulacrum.

4 regressions, 4 improvements, 2 mixed results. 5 of them in rollups.

See the full report for more.

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.


No RFCs are currently in the final comment period.

Tracking Issues & PRs

No Tracking Issues or PRs are currently in the final comment period.

New RFCs

Upcoming Events


North America

Asia Pacific

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

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

Quote of the Week

I know noting about the compiler internals but it looks to me as if 90% of the time is spent pretty-printing LayoutError.

Vadzim Dambrouski on github

Thanks to mmmmib for the suggestion.

Please submit quotes and vote for next week!

This Week in Rust is edited by: nellshamrell, llogiq, and cdmistman.

Discuss on r/rust