anchor.diff:      case ets:lookup(State, Key) of
           [] ->
               log:log(error, "[ ~w ] Lookup of ~w in ~w failed~n", [state_get(instance, State), Key, State]),
  -            error(lookup_failed, [Key, State]);
  +            erlang:error(lookup_failed, [Key, State]);
           [{Key, Value}] -> Value
       end.
   
  
positive.code: %%      Used as value_creator in tester.erl (property testing).
  -spec tester_create_state(ConvCount, Leader, LoadData, Merged, Range, Round, Status,
          NoOfBuckets, Request, Instance) -> state() when
      ConvCount :: non_neg_integer(),
      Leader :: boolean(),
      LoadData::load_data(),
      Merged :: non_neg_integer(),
      Range :: intervals:non_empty_interval(),
      Round :: non_neg_integer(),
      Status :: init|uninit,
      NoOfBuckets :: 1..50,
      Request :: boolean(),
      Instance :: instance().
  tester_create_state(ConvCount, Leader, LoadData, Merged, Range, Round, Status,
          NoOfBuckets, Request, Instance) ->
      NewState = ets:new(cbstate, [set, protected]),
  
negative.code: 
  -spec request_histogram(Size::pos_integer(), SourceId::comm:mypid()) -> ok.
  request_histogram(Size, SourcePid) when Size < 1 ->
      erlang:error(badarg, [Size, SourcePid]);
  
  request_histogram(Size, SourcePid) ->
      gossip:start_gossip_task(?MODULE, [Size, SourcePid]).
  