ignored.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Failure</code> if the given string is not
   a valid representation of an integer, or if the integer represented
   exceeds the range of integers representable in type <code class="code">int32</code>.</li>
</ul>
</div>

<pre id="VALof_string_opt">val of_string_opt : string -&gt; int32 option</pre><div class="info ">
<div class="info-desc">
<p>Same as <code class="code">of_string</code>, but return <code class="code">None</code> instead