anchor.diff:  
       ok.
   
  +dynamic_fold_test(Config) ->
  +    [Node1 | _Nodes] = proplists:get_value(nodes, Config),
  +
  +    %% Define a pair of counters to store the global average.
  +    {ok, {_GA, _, _, _}} = rpc:call(Node1, lasp, declare, [global, {lasp_pair, [lasp_gcounter, lasp_gcounter]}]),
  +
  +    ok.
  +
  +% %% Declare a dynamic variable.
  +% Samples = lasp:declare_dynamic(
  +%     {bounded_lww_set, 100}),
  +    
  +% %% Define a local average; this will be 
  +% %% computed from the local Bounded-LWW set.
  +% LocalAverage = lasp:declare_dynamic(
  +%     {counter, counter}),
  +    
  +% %% Register an event handler with the sensor 
  +% %% that is triggered each time an event X is 
  +% %% triggered at a given timestamp T.
  +% EventHandler = fun({X, T} ->
  +%     lasp:update(Samples, {add, x, t}, Actor)
  +% end,
  +% register_event_handler(EventHandler),
  +    
  +% %% Fold the samples using the binary function 
  +% %% `avg' into a local average.
  +% lasp:fold(Samples, fun avg/2, LocalAverage)
  +    
  +% %% Fold the local average using the binary 
  +% %% function `avg' into a global average.
  +% lasp:fold_dynamic(LocalAverage, 
  +%                         fun sum_pairs/2, 
  +%                         GlobalAverage)
  +
   orset_test(Config) ->
       [Node1 | _Nodes] = proplists:get_value(nodes, Config),
   
  
positive.code: -export([ivar_test/1,
           orset_test/1,
           dynamic_ivar_test/1,
           leaderboard_test/1,
           advertisement_counter_test/1,
           monotonic_read_test/1,
  
negative.code:      ivar_test,
       orset_test,
       dynamic_ivar_test,
       dynamic_fold_test,
       leaderboard_test,
       advertisement_counter_test,
       monotonic_read_test,
  