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? Tag us at @ThisWeekInRust on Twitter or @ThisWeekinRust on mastodon.social, 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 dhat, a crate providing DHAT-like allocation profiling capabilities.

Thanks to Kornel 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

368 pull requests were merged in the last week

Rust Compiler Performance Triage

Relatively quiet week for performance, with most regressions and improvements being pretty small.

Triage done by @simulacrum. Revision range: 109ccc..8a746f4


(instructions:u) mean range count
Regressions ❌
0.9% [0.2%, 2.8%] 28
Regressions ❌
0.7% [0.2%, 1.3%] 39
Improvements ✅
-1.0% [-1.1%, -1.0%] 2
Improvements ✅
-1.7% [-4.3%, -0.2%] 24
All ❌✅ (primary) 0.8% [-1.1%, 2.8%] 30

3 Regressions, 4 Improvements, 2 Mixed; 3 of them in rollups 53 artifact 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 and Updated RFCs

  • No New or Updated RFCs were created this week.

Call for Testing

An important step for RFC implementation is for people to experiment with the implementation and give feedback, especially before stabilization. The following RFCs would benefit from user testing before moving forward:

  • No RFCs issued a call for testing this week.

If you are a feature implementer and would like your RFC to appear on the above list, add the new call-for-testing label to your RFC along with a comment providing testing instructions and/or guidance on which aspect(s) of the feature need testing.

Upcoming Events

Rusty Events between 2022-12-21 - 2023-01-18 🦀




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.


Please see the latest Who's Hiring thread on r/rust

Quote of the Week

In the depths of a computer's core,
Where bits and bytes are stored,
Lies a tool that's often ignored
But without it, things would be floored.

It's the rust borrow checker,
A guardian of memory,
Ensuring that data is in the right place
And never causing miseries.

With each line of code it carefully scans,
Checking for underflows and overflows,
Preventing errors, saving the day,
And keeping the program in a flow.

So let's give a nod to this silent hero,
Whose work may go unnoticed, but is never zero,
It's the rust borrow checker,
A vital part of the machine,
Ensuring our programs run clean.

ChatGPT prompted by Vivek Yadav

llogiq is quite self-appreciative for the suggestion.

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, bennyvasquez.

Email list hosting is sponsored by The Rust Foundation

Discuss on r/rust