ass="keyword">val</span> concat</span> : <code class="type">bytes -&gt; bytes list -&gt; bytes</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">concat&nbsp;sep&nbsp;sl</code> concatenates the list of byte sequences <code class="code">sl</code>,
    inserting the separator byte sequence <code class="code">sep</code> between each, and
    returns the result as a new byte sequence.</p>

<p>Raise <code class="code"><span class="constructor">Invalid_argument</span></code> if the resu