mro_gather_and_rename set aside for us) this way, in case
one class in this list is a superclass of a another class
that we have already encountered. In such a case, meta->isa
-
+ will have been overwritten without old entries being deleted
from PL_isarev. */
struct mro_meta * const meta = HvMROMETA(stash);
if(meta->isa != (HV *)HeVAL(iter)){