`for(var/O as obj)` causes a null type enumerator error

[ike709]

Eternia has the following code: for(var/O as obj) It compile in BYOND (I assume as for(var/obj/O in world)) but errors in OpenDream: Error OD0000 at code/social/cmd.dm:1610:15: Attempted to create a type enumerator with a null type