code: func Register(local *pflag.FlagSet, globalName string) {
  	if f := flag.CommandLine.Lookup(globalName); f != nil {
  		pflagFlag := pflag.PFlagFromGoFlag(f)
  		pflagFlag.Name = normalize(pflagFlag.Name)
  		local.AddFlag(pflagFlag)
  	} else {
  		panic(fmt.Sprintf("failed to find flag in global flagset (flag): %s", globalName))
  	}
  }
docs: // Register adds a flag to local that targets the Value associated with the Flag named globalName in flag.CommandLine.