anchor.diff:  
   % cerl_sets:new/0, OTP-18
   has_cerl_sets_new_0() ->
  -    code:ensure_loaded(cerl_sets),
  +    _ = code:ensure_loaded(cerl_sets),
       erlang:function_exported(cerl_sets, new, 0).
   
   test_has_cerl_sets_new_0(_Config) ->
  
positive.code: 
  % mnesia:sync_log/0, OTP-17
  has_mnesia_sync_log_0() ->
      code:ensure_loaded(mnesia),
      erlang:function_exported(mnesia, sync_log, 0).
  
  test_has_mnesia_sync_log_0(_Config) ->
  
negative.code: 
  % maps:get/2, OTP-17
  has_maps_get_2() ->
      _ = code:ensure_loaded(maps),
      erlang:function_exported(maps, get, 2).
  
  test_has_maps_get_2(_Config) ->
  