# Get a module by its short name; if required, the module is loaded, parsed and its hierarchies computed.
	# If `mgroup` is set, then the module search starts from it up to the top level (see `paths`);
	# if `mgroup` is null then the module is searched in the top level only.
	# If no module exists or there is a name conflict, then an error on `anode` is displayed and null is returned.
	fun get_mmodule_by_name(anode: nullable ANode, mgroup: nullable MGroup, name: String): nullable MModule
	do
		var mmodule = search_mmodule_by_name(anode, mgroup, name)
		if mmodule == null then return null # Forward error
		var ast = mmodule.load(self)
		if ast == null then return null # Forward error
		return mmodule
	end