"arrow">&#45;&gt;</span></span>
  <span><span class="label">dst</span>:bytes <span class="arrow">&#45;&gt;</span></span>
  <span><span class="label">dst_pos</span>:int <span class="arrow">&#45;&gt;</span></span>
  <span><span class="label">len</span>:int <span class="arrow">&#45;&gt;</span></span>
  unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-length"><a href="#val-length" class="anchor"></a><code><span><span class="keyword">val</span> length : <span>string <