anchor.diff:  bif(list_to_existing_atom, 1) -> true;
   bif(list_to_float, 1) -> true;
   bif(list_to_integer, 1) -> true;
  +bif(list_to_integer, 2) -> true;
   bif(list_to_pid, 1) -> true;
   bif(list_to_tuple, 1) -> true;
   bif(load_module, 2) -> true;
  
positive.code: bif(max,2) -> true;
  bif(min,2) -> true;
  bif(module_loaded, 1) -> true;
  bif(monitor_node, 2) -> true;
  bif(node, 0) -> true;
  bif(node, 1) -> true;
  
negative.code: bif(concat_binary, 1) -> true;
  bif(date, 0) -> true;
  bif(delete_module, 1) -> true;
  bif(demonitor, 1) -> true;
  bif(demonitor, 2) -> true;
  bif(disconnect_node, 1) -> true;
  bif(element, 2) -> true;
  bif(erase, 0) -> true;
  bif(erase, 1) -> true;
  bif(error, 1) -> true;
  bif(error, 2) -> true;
  bif(exit, 1) -> true;
  bif(exit, 2) -> true;
  bif(float, 1) -> true;
  