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.

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Updates from Rust Community




Project/Tooling Updates


Rust Walkthroughs



Crate of the Week

This week's crate is dxf-rs, a library to parse AutoCAD files.

Thanks to cosj 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

A mixed week. I suppose it is best to focus on the fact we made some big improvements to a large number of primary benchmarks, at the cost of some smaller regressions to a smaller number of primary benchmarks.

Triage done by @pnkfelix. Revision range: bb55bd44..edab34ab


mean max count
Regressions 😿
0.6% 1.6% 35
Regressions 😿
2.1% 8.1% 23
Improvements 🎉
-0.8% -3.5% 72
Improvements 🎉
-0.8% -2.9% 62
All 😿🎉 (primary) -0.4% -3.5% 107

4 Regressions, 3 Improvements, 5 Mixed; 4 of them in rollups 47 artifact comparisons made in total

Full report here.

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.

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

Upcoming Events

Rusty Events between 2022-06-15 - 2022-07-13 🦀


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







Spire Global

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

Quote of the Week

Because lower-level software has more operational constraints than higher-level software (e.g. it typically cannot tolerate a runtime or memory management via garbage collection), developing a memory safe language suitable for systems software is particularly challenging. The Rust language has met that challenge, however, and is an excellent candidate for replacing C in many systems applications.

We plan to invest in the tools that allow systems engineers to move their software to Rust. This means investing in improving package management, compilers, and Foreign Function Interface (FFI) generators. In many cases this will include providing interfaces compatible with existing widely-used components to enable transition. With these tools, adoption of a memory safe alternative will scale much faster without replication of efforts.

The White House Open Source Software Mobilization Plan, multiple authors (PDF link)

Thanks to Brian Kung 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.

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