Thanks for the info. Where can I follow/read this discussion?

Dots are not allowed. If it’s not too much code, you can use inline modules, otherwise you have to stick to:

action/
    attack/test/
        mod.rs

And then:

mod attack::test;

Sorry, but I don’t believe it will get simple. And you can’t expect people to believe it is “transitioning” when talking about a 20 year old project. I would love to, but I don’t think it’s realistic.

I did look into GNU Guix but I discarded it because it looked like it had the same problems, and IIRC did not have build cache.