#92 asked for coroutines support, with the desire to see the implemented FSM behind them. After investigating this issue for some time the conclusion is to show coroutines as written. Without support for the implemented FSM behind them. There is a blog post which explains what needs to be done to show the FSM behind coroutines: Coroutines in C++ Insights. A following Twitter poll did not achieve enough confidence (for more information see here: Coroutines in C++ Insights - The poll result), that it is worth at this point to create a questionable implementation.
One thing to note is, at the moment only libc++ does support coroutines. You will need to enable using libc++ at the web front end of C++ Insights to get rid of compiler errors.