start&nbsp;c</code> tests if byte <code class="code">c</code> appears in <code class="code">s</code> after
    position <code class="code">start</code>.  <code class="code">contains&nbsp;s&nbsp;c</code> is equivalent to <code class="code">contains_from
&nbsp;&nbsp;&nbsp;&nbsp;s&nbsp;0&nbsp;c</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Invalid_argument</code> if <code class="code">start</code> is not a valid position in <code class="code">s</code>.</li>
</ul>
</div>

<pre id="VALr