ets to <code class="code">el</code> all pointers of <code class="code">ar</code> from
   <code class="code">ofs</code> to <code class="code">ofs + len - 1</code>.  Raise <code class="code"><span class="constructor">Invalid_argument</span> <span class="string">"Weak.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>
</div>

<pre><span id="VALblit"><span class="keyword">val</span> blit</span> : <code c