tor">Array</span>.fill a ofs len x</code> modifies the array <code class="code">a</code> in place,
   storing <code class="code">x</code> in elements number <code class="code">ofs</code> to <code class="code">ofs + len - 1</code>.
<p>

   Raise <code class="code"><span class="constructor">Invalid_argument</span> <span class="string">"Array.fill"</span></code> if <code class="code">ofs</code> and <code class="code">len</code> do not
   designate a valid subarray of <code class="code">a</code>.<br>
</p></div>