anchor.diff:      tester:unregister_value_creator({typedef, intervals, simple_interval}),
       tester:unregister_value_creator({typedef, intervals, continuous_interval}),
       tester:unregister_value_creator({typedef, prime, prime_list}),
  +    tester:unregister_value_creator({typedef, prime, rev_prime_list}),
       true.
   
   tester_type_check_node(_Config) ->
  
positive.code: %% @copyright 2012-2013 Zuse Institute Berlin
  
  %   Licensed under the Apache License, Version 2.0 (the "License");
  %   you may not use this file except in compliance with the License.
  
negative.code:     tester:register_value_creator({typedef, intervals, simple_interval}, intervals, tester_create_simple_interval, 1),
      tester:register_value_creator({typedef, intervals, continuous_interval}, intervals, tester_create_continuous_interval, 4),
      tester:register_type_checker({typedef, gossip2, state}, gossip2, is_state),
      tester:register_type_checker({typedef, gossip_load, histogram}, gossip_load, is_histogram),
      tester:register_type_checker({typedef, gossip_load, state}, gossip_load, is_state),
      tester:register_value_creator({typedef, gossip2, state}, gossip2, tester_create_state, 9),
      tester:register_value_creator({typedef, gossip_load, histogram}, gossip_load, tester_create_histogram, 1),
      tester:register_value_creator({typedef, gossip_load, state}, gossip_load, tester_create_state, 10),
      Modules = [ {gossip2, % excluded (exported functions)
              [   {start_link, 1}, % type of pid_groups:groupname() seems not restrictive enough
                  {init, 1}, % does not return fully filled state
                  {start_gossip_task, 2}, % send messages
  