# Creation of a new class (AST representation) with the given MClassDef.
	# Note all the properties of our MClassDef will also generate an AST representation.
	# Make an error if the attribute already has a representation in the modelbuilder.
	# This method also create the default constructor.
	fun create_class_from_mclassdef(mclassdef: MClassDef, mmodule: MModule): AStdClassdef do
		var n_classdef = mclassdef.create_ast_representation
		n_classdef.location = mclassdef.location
		n_classdef.validate

		for n_propdef in n_classdef.n_propdefs do
			var mpropdef = n_propdef.mpropdef
			assert mpropdef != null

			var p_npropdef = mpropdef2node(mpropdef)
			if  p_npropdef != null then error(null, "The property `{mpropdef.name}` already has a representation in the AST.")
			unsafe_add_mpropdef2npropdef(mpropdef, n_propdef)
		end

		process_default_constructors(n_classdef)
		unsafe_add_mclassdef2nclassdef(mclassdef, n_classdef)

		return n_classdef
	end