= integer()</tt></li><li><tt>Iterator = <a href="#type-iterator">iterator</a>(integer())</tt></li></ul></p>
<p> </p>
</div><p><p>
  Returns an iterator over a sequence of integers that starts with
  <code>From</code> and contains the successive results of adding <code>Incr</code> to the
  previous element, until <code>To</code> is reached or passed (in the latter
  case, <code>To</code> is not an element of the sequence). <code>Incr</code> defaults to  
1.</p>
 
  Failures:
  <ul>
  <li>If <code>To &lt; Fro