# Resolve the module identification for a given `AModuleName`.
	#
	# This method handles qualified names as used in `AModuleName`.
	fun search_module_by_amodule_name(n_name: AModuleName, mgroup: nullable MGroup): nullable MModule
	do
		var mod_name = n_name.n_id.text

		# If a quad is given, we ignore the starting group (go from path)
		if n_name.n_quad != null then mgroup = null

		# If name not qualified, just search the name
		if n_name.n_path.is_empty then
			# Fast search if no n_path
			return search_mmodule_by_name(n_name, mgroup, mod_name)
		end

		# If qualified and in a group
		if mgroup != null then
			# First search in the package
			var r = mgroup.mpackage.root
			assert r != null
			scan_group(r)
			# Get all modules with the final name
			var res = r.mmodules_by_name(mod_name)
			# Filter out the name that does not match the qualifiers
			res = [for x in res do if match_amodulename(n_name, x) then x]
			if res.not_empty then
				if res.length > 1 then
					error(n_name, "Error: conflicting module files for `{mod_name}`: `{[for x in res do x.filepath or else x.full_name].join("`, `")}`")
				end
				return res.first
			end
		end

		# If no module yet, then assume that the first element of the path
		# Is to be searched in the path.
		var root_name = n_name.n_path.first.text

		# Search for an alias in required external packages
		if mgroup != null then
			var alias = mgroup.mpackage.import_alias(root_name)
			if alias != null then root_name = alias
		end

		var roots = search_group_in_paths(root_name, paths)
		if roots.is_empty then
			error(n_name, "Error: cannot find `{root_name}`. Tried: {paths.join(", ")}.")
			return null
		end

		var res = new ArraySet[MModule]
		for r in roots do
			# Then, for each root, collect modules that matches the qualifiers
			scan_group(r)
			var root_res = r.mmodules_by_name(mod_name)
			for x in root_res do if match_amodulename(n_name, x) then res.add x
		end
		if res.not_empty then
			if res.length > 1 then
				error(n_name, "Error: conflicting module files for `{mod_name}`: `{[for x in res do x.filepath or else x.full_name].join("`, `")}`")
			end
			return res.first
		end
		# If still nothing, just call a basic search that will fail and will produce an error message
		error(n_name, "Error: cannot find module `{mod_name}` from `{root_name}`. Tried: {paths.join(", ")}.")
		return null
	end