e class="code">sep</code> between each, and
    returns the result as a new byte sequence.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Invalid_argument</code> if the result is longer than
    <a href="Sys.html#VALmax_string_length"><code class="code">Sys.max_string_length</code></a> bytes.</li>
</ul>
</div>

<pre id="VALcat">val cat : bytes -&gt; bytes -&gt; bytes</pre><div class="info ">
<div class="info-desc">
<p><code class="code">cat&nbsp;s1&nbsp;s2</code> concatenates <code class="c