anchor.diff:              ok
       end.
   
  +del_group(<<"all">>) ->
  +    {error, reserved_name};
   del_group(Groupname) ->
       case group_exists(Groupname) of
           false ->
  
positive.code:                     end
              catch
                  error:badarg ->
                              {error, {unknown_permission, Perm}}
              end;
          _ ->
              {error, {unknown_permission, Perm}}
  
negative.code:     %% all is always valid
      case validate_permissions(Grants) of
          ok ->
              add_grant_int([{all, group}], Bucket, Grants);
          Error ->
              Error
      end;
  