So, in lieu of the new function* syntax, the presence of the yield keyword in the body is the only thing that distinguishes a generator from a regular function, in the current Firefox implementation?

Cool, I didn't know about that syntax!

Unfortunately it isn't yet supported in Firefox, but I'm glad something like that is in the works.

Hope I didn't offend. I really enjoyed your post; the coroutine syntax seems like an extraordinarily intuitive approach to state machines. Game-changing, maybe. Look forward to trying it.