If any part of LIST is an array, "foreach" will get very
  confused if you add or remove elements within the loop
  body, for example with "splice".   So don’t do that

##</code><code>##


  $it = &make_list_into_iterator(LIST);
  $count = $it->figure_out_element_count;

  while ($count-- > 0) {
    $_ = $it->next;

    CODE
  }