Return value of type T, or nothing if T was unspecified. See $(DPMODULE2 conversions,functions) for how to catch multiple return values.
lua.doString(`function ask(question) return 42 end`); auto ask = lua.get!LuaFunction("ask"); auto answer = ask.call!int("What's the answer to life, the universe and everything?"); assert(answer == 42);
Call this function.