anchor.diff:  
   select_auth_infos(KeySpec) ->
       replicated_dets:select(storage_name(), {auth, KeySpec}, 100).
  -
  --spec get_identity({rbac_identity(), []}) -> rbac_identity().
  -get_identity({Identity, _}) ->
  -    Identity.
   
   build_auth(false, undefined, _UserName) ->
       password_required;
  
positive.code:             false ->
                  ns_config:search_prop(ns_config:latest(), user_roles, Identity, [])
          end,
      get_user_roles({Identity, Props}).
  
  -spec get_user_name(rbac_identity()) -> rbac_user_name().
  get_user_name(Identity) ->
  
negative.code:          authenticate/2,
           get_memcached_auth/1,
           get_auth_infos/1,
           get_roles/1,
           get_user_name/1,
           upgrade_to_4_5/1,
           build_memcached_auth_info/1,
           get_users_version/0,
           get_auth_version/0]).
  