code: func CheckGlobalVarFlags() []error {
  	fmt.Fprint(os.Stdout, "   ↳ checking flags from global vars\n")
  	errors := []error{}
  	pflag.CommandLine.VisitAll(func(f *pflag.Flag) {
  		errors = append(errors, fmt.Errorf("flag %q is invalid, please don't register any flag under the global variable \"CommandLine\"", f.Name))
  	})
  	return errors
  }
docs: // CheckGlobalVarFlags checks if the global flags are valid