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> > Lua 5.3 has `lua_isyieldable`[1] (or `coroutine.isyieldable`[2] on the 
> > Lua side). For previous Lua versions you are out of luck.
> Great, thank you. My Lua implementation is currently in
> development/beta, so I can make big changes and upgrade the version.

if you don't mind fiddling with lua's internals, I have a small module
( which among other things also needs to check
whether lua can yield, look at YIELDCOND, right at the start.