> They're neutered because they can't suspend and transfer control to a function other than the one that called them ("Note also that "coroutines" here are really "semicoroutines" since they can only yield back to their caller." https://lang-team.rust-lang.org/design_notes/general_corouti...)

Huh? At first glance wanting to do this sounds absolutely insane to me. As in, it sounds a lot like "imagine a function could return not just to its caller function, but to other functions as well! So if you call it, it might be that you won't even end up returning to the same function with which you started, but somewhere completely different".

What am I missing? This sounds absolutely insane at first glance, like a straight-up go-to. What's the most simple use case for these sort of weird yields to other functions?