# Collect all MEntities in `self`
	fun collect_mentities(filter: nullable ModelFilter): HashSet[MEntity] do
		var res = new HashSet[MEntity]
		res.add_all collect_mpackages(filter)
		res.add_all collect_mgroups(filter)
		res.add_all collect_mmodules(filter)
		res.add_all collect_mclasses(filter)
		res.add_all collect_mclassdefs(filter)
		res.add_all collect_mproperties(filter)
		res.add_all collect_mpropdefs(filter)
		return res
	end