anchor.diff:              {'$gen_cast', {#debug{what=_Other}, _Context}} ->
                   ?MODULE:page_debug_stream_loop(TargetId, What, Context)
           end.
  -        
  +
  
positive.code: file_changed(F) ->
      case file_blacklisted(F) of
          true -> nop;
          false -> 
              handle_file(filename:extension(F), F)
      end,
      ok.
  
  
negative.code: %%                                       {stop, Reason, State}
  %% @doc Periodic check if the dev server is still running.
  handle_info(ensure_server, State) ->
      z_utils:flush_message(ensure_server),
      {noreply, State};
  
  %% @doc Handling all non call/cast messages
  