nbsp;<span class="keywordsign">-&gt;</span>&nbsp;dst:bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;dst_pos:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;len:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;concat&nbsp;:&nbsp;sep:bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bytes&nbsp;list&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;bytes<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;cat&nbsp;:&nbsp;bytes&nb