seq_with"><a href="#val-add_seq_with" class="anchor"></a><code><span><span class="keyword">val</span> add_seq_with : 
  <span><span class="label">f</span>:<span>(<span><a href="#type-key">key</a> <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'a</span> <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'a</span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'a</span>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span><span c