anchor.diff:      term(),
       list()
   ) ->
  -    ok.
  +    interrupt_reason().
  
positive.code: %%--------------------------------------------------------------------
  -callback handle_workflow_interrupted(
      workflow_engine:execution_id(),
      workflow_engine:execution_context()
  ) ->
      progress_data_persistence().
  
  
negative.code:     ?END_EXECUTION. % engine does not distinguish reason of execution finish - ?END_EXECUTION is returned
                         % if processed lane is last lane as well as on error
  -type progress_data_persistence() :: save_progress | save_iterator | clean_progress.
  -type interrupt_reason() :: term().
  
  -export_type([handler/0, async_processing_result/0, handler_execution_result/0, prepare_lane_result/0,
      lane_stopped_callback_result/0, progress_data_persistence/0, interrupt_reason/0]).
  
  %%%===================================================================
  %%% Callbacks descriptions
  