I wish there were a statically typed language with Lua's stackful coroutines and the ability to manually yield. It seems that Lua and Ruby are the only two well

I wish there were a statically typed language with Lua's stackful coroutines and the ability to manually yield. It seems that Lua and Ruby are the only two well-known languages with that kind of stackful coroutine. And also, LuaJIT has proven that they can be implemented in a performant way, so I'm not sure if performance is a valid obstacle to implementing them more often. Even languages like Go and Java with proper fibers don't allow you to yield where you want to, and the yield points are inserted by the compiler/runtime instead. A use case which I can't seem to reimplement without stackful coroutines is "inline" blocking input, as found in the source code of old roguelikes. It makes the game logic easier to follow since you don't have to rearchitect the entire engine to be event-based, and can instead yield between an "update" and "draw" coroutine each frame. msg("Do you want your possessions identified?) local yes = yes_or_no() if yes then identify_possessions() end I was honestly very surprised when I first realized that this is not how most graphical turn-based games are programmed.