nitc :: ModelDiamond :: mclass_d
mclass_b) and C (mclass_c)
# D, a multiple subclass of B (`mclass_b`) and C (`mclass_c`)
var mclass_d = new MClass(mmodule0, "D", location, null, concrete_kind, public_visibility)
src/model/model.nit:2835,2--2836,91