# Build a new `MClassDef` from a `node`.
	#
	# REQUIRE `node.labels.has("MClassDef")`
	private fun to_mclassdef(model: Model, node: NeoNode): MClassDef do
		var m = mentities.get_or_null(node.id.as(Int))
		if m isa MClassDef then return m

		assert node.labels.has("MClassDef")
		var mmodule = to_mmodule(model, node.in_nodes("DEFINES").first)
		var mtype = to_mtype(model, node.out_nodes("BOUNDTYPE").first).as(MClassType)
		var location = to_location(node["location"].to_s)
		var mclassdef = new MClassDef(mmodule, mtype, location)
		mentities[node.id.as(Int)] = mclassdef
		set_doc(node, mclassdef)
		var supertypes = new Array[MClassType]
		for sup in node.out_nodes("INHERITS") do
			supertypes.add to_mtype(model, sup).as(MClassType)
		end
		mclassdef.set_supertypes(supertypes)
		mclassdef.add_in_hierarchy
		return mclassdef
	end