anchor.diff:                 {objects_failed, EC},
                  {fatal_stop, FS}],
       {reply, {ok, Summary}, StateName, State};
  -
  +handle_sync_event({set_concurrency, Value}, _From, working, {max_worker_count = Value} = State) ->
  +    {reply, {ok, no_change}, working, State};
  +handle_sync_event({set_concurrency, Value}, _From, working, {max_worker_count = OldValue} = State) ->
  +    {reply, {ok, modified, OldValue}, working, State#state{max_worker_count = Value} };
  +handle_sync_event(set_concurrency, _From, StateName, State) ->
  +    {reply, {error, bad_state}, StateName, State};
   handle_sync_event(get_account_dets, _From, StateName, State = #state{ acct_info = AcctInfo }) ->
       {reply, AcctInfo, StateName, State};
   handle_sync_event(_Event, _From, StateName, State) -> {next_state, StateName, State}.
  
positive.code: 
  status() ->
      gen_fsm:sync_send_all_state_event(?SERVER, status).
  
  halt_actions() ->
      gen_fsm:sync_send_all_state_event(?SERVER, halt).
  
negative.code: % API Exports
  -export([ ping/0,
            start_link/0,
            set_concurrency/1,
            migrate/3,
            migrate_next/1,
            migrate_user_password_storage/2,
  