What are the `impl Days`


“impl Days” is the sibling event of RustFest Zürich. “impl Days” is a two full-day event for Rust contributors to collaborate in an active programming session. They will take place on the two days following the RustFest talks and workshops, on 23th and 24th of June 2024

For directions you can check the location page.

We open doors at 08:30 in the morning.
We will wind down at 17:00.

What to hack on

For updated project information, check our 🦀🦀 live document 🦀🦀

(for inspiration our last live document from Barcelona)


Born as a hacking and development experiment in the early RustFest editions, the “impl Days” have established as a tradition following each RustFest.

The name refers to the first edition that took place during the 2017 “impl Period”, therefore the name “impl Days” was a natural choice. Over those two days, 30 to 40 people came together to discuss, design, and implement changes to Rust itself as well its broader ecosystem.

Plus, they got to build a Lego Death Star at some point.

The Zurich “impl Days” 2017 were such a success that we decided to repeat the event in Paris, Rome, Barcelona and now in Zürich again where it was an even bigger success (also, a rocket).

impl Days Zürich

“impl Days” will be hosted in the ETH Zentrum Campus.

ETH Zurich
Clausiusstrasse 5
8092 Zurich

“impl Days” are a great chance to work directly with other Rust enthusiasts. The Rust project is supported by volunteers across the globe, and while we often rely on github comments and IRC channels for communication, face-to-face communication enabled by an event like this can be a big productivity boost.

You may be just starting out as a Rust contributor, or you may be a long-time compiler hacker who reminisces about the days when Rust was bootstrapped atop ML. Either way, there’s plenty of tasks for all contributors at “impl Days”.

You do not need to buy a separate ticket: your RustFest ticket will suffice.

Thus, everyone who plans to attend “impl Days” should tell us explicitly on the online questionnaire built into the RustFest ticket.

Special guest: Wolfgang

Wolfgang’s Picture

Wolfgang is making videos on Youtube about efficent servers and NAS. We are very happy to announce that he will join us and you have the chance to implement a challenging project:

How to get the most work out of the least energy ⚡

What will happen at the “impl Days”?

The schedule will be announced closer to the event, when details are finalized.

The general idea is to arrive at the location in the morning, then there will be a headcount and some time spent getting to know each other, finally identify tasks for participants to collaborate on. Each of the two days will start winding down in the afternoon. Further details will be finalized at a later stage.

Lacking ideas or suggestions for projects to work on? No problem!

Most of all participants should enjoy “impl Days” without any pressure or accomplishment requirement. If your final result is a better understanding of the Rust world and having met some cool folks to keep in touch with, well - that’s a fantastic result as well! 🎊

More detailed planning will be done on-the-fly at the event itself, based on the skill sets of the people showing up to contribute.