Hello

We discussed this briefly on Discord, but to make it a more official request I create this issue
It would be great if you could find an alternative to the unstable Rust features currently in use.

The reason is that you need Rust with unstable features enabled to build your app. This is currently impossible on Gentoo. The nightly feature (which allows unstable features) is blocked since Rust 1.72.0 for stability reasons ¹. So we cannot offer your app as a (source built) package at the moment 😟
I don't know if it also impacts other source-driven distros.
Also I think it's safer for you to rely on stable features, the risk that they are suddenly removed from Rust is much lower.