The driver calls compile_object(3) in the event that the mudlib
instructs the driver to load a file that does not exist. For example,
the driver will call compile_object("/obj/file.r") in master if the
mudlib calls call_other("/obj/file.r", "some_function") or
new("/obj/file.r") and /obj/file.r.c names a file that does not exist.
The compile_object() function is expected to return 0 if the mudlib
does not wish to associate an object with the file name "/obj/file.r".
If the mudlib does wish to associate an object with the filename
"/obj/file.r", then the mudlib should return the object it wishes asso‐
ciated. After an association is made between an object and a filename,
then it will be as if the file, file.r.c, did exist (to the driver) and
when loaded produced the object that compile_object() returned.