//
	// invalid value "256.0.0.1" for flag -ip: could not parse IP
	// Usage of ExampleFunc:
	//   -ip IP address
	//     	IP address to parse
	// {ip: <nil>, loopback: false}
}

func ExampleBoolFunc() {
	fs := flag.NewFlagSet("ExampleBoolFunc", flag.ContinueOnError)
	fs.SetOutput(os.Stdout)

	fs.BoolFunc("log", "logs a dummy message", func(s string) error {
		fmt.Println("dummy message:", s)
		return nil
	})