anchor.diff:                    pos_integer(), pos_integer()) -> ok.
   mark_dropped(TorrentID, Index, Offset, Length) ->
       ChunkSrv = lookup_chunk_server(TorrentID),
  -    call(ChunkSrv, {mark_dropped, self(), Index, Offset, Length}).
  +    cast(ChunkSrv, {mark_dropped, self(), Index, Offset, Length}).
   
   %% @doc
   %% Mark all currently open requests as dropped.
  
positive.code:     end),
      Ref = monitor(process, Pid),
      ok  = receive {'DOWN', _, process, Pid, _} -> ok end,
      ?assertMatch({ok, [{0, 0, 1}]}, ?chunk_server:request_chunks(10, Has, 1)).
  
  
  
negative.code:     end),
      Ref = monitor(process, Pid),
      ok  = receive {'DOWN', _, process, Pid, _} -> ok end,
      timer:sleep(10),
      ?assertMatch({ok, [{0, 0, 1}]}, ?chunk_server:request_chunks(6, Has, 1)),
      ?assertMatch({ok, [{0, 1, 1}]}, ?chunk_server:request_chunks(6, Has, 1)).
  
  