# The introduction of `mclass_d`
	var mclassdef_d: MClassDef do
		var res = new MClassDef(mmodule0, mclass_d.mclass_type, location)
		res.set_supertypes([mclass_b.mclass_type, mclass_c.mclass_type])
		res.add_in_hierarchy
		return res
	end