case nil:
if f.NArg() > 0 && positional == "" {
fmt.Fprintf(stderr, "unrecognized command line arguments: %v (try -help)\n", f.Args())
case nil:
if f.NArg() > 0 && positional == "" {
fmt.Fprintf(stderr, "unrecognized command line arguments: %v (try -help)\n", f.Args())