[codeflo]

> nearly all languages lack a way to solve this

The only thing I’ve seen that goes in this direction is Knuth’s literate programming. I’ve tried it. In its current form it’s still clumsy, lacks tool support and IMO doesn’t fully solve the problem of how to deal with documenting a changing piece of software yet. Knuth got his requirements correct on the first try; the rest of us aren’t so lucky.