n class="constructor">Invalid_argument</span></code> if the result length is negative or
    longer than <a href="Sys.html#VALmax_string_length"><code class="code"><span class="constructor">Sys</span>.max_string_length</code></a> bytes.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.05.0</li>
</ul>
</div>

<pre><span id="VALfill"><span class="keyword">val</span> fill</span> : <code class="type">bytes -&gt; pos:int -&gt; len:int -&gt; char -&gt; unit</code></pre><div class="info ">
<div class="in