I am changing Rye to use Go modules, which became mandatory with Go 1.18. This took me some time, because of Rye's very dynamic use of modules. I described the problem in a few Go forum posts. No obvious solution was found - although, very kind community! Now I think I see how it can be done in an OK way, and could also improve the Rye experience at the end. In the meantime, while making the builder script I also needed and added small addition to the language in terms of functions, and in terms of concepts. The if-with . More about it in the pic below: Follow our development on Github .