anchor.diff:          _ ->
               %% ignore unknown messages
               ?MODULE:worker_loop(Parent)
  +    after 1000 ->
  +            ?MODULE:worker_loop(Parent)
       end.
   
  
positive.code: %% ====================================================================
  
  worker_loop(Parent) ->
      Parent ! worker_ready,
      receive
          {compaction, Pid} ->
              Start = now(),
  
negative.code:          terminate/2, code_change/3]).
  
  -record(state, { queue,
                   worker }).
  
  %% ====================================================================
  %% API
  