 						Command.Description(
 							name: "update",
 							overview: "Update package dependencies",
-							callback: echo,
+							callback: nil,
 							options: [
 								Option.Description(
 									flag: .long("repin"),

							subCommands: [])
					])
			])

		// args normally is CommandLine.arguments
		do {


	}

	func echo(evaluation: Command.Evaluation) throws {
		print(
			"\(evaluation.name) evaluated with " +
