pan><span class="optlabel">?sep</span>:string <span class="arrow">&#45;&gt;</span></span>
  <span><span><span>(<a href="#type-pipe">pipe</a>, <a href="#type-pipe">pipe</a>, <span class="type-var">'stderr</span>)</span> <a href="#type-t">t</a></span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="label">lines</span>:<span>string <span class="xref-unresolved">Stdlib</span>.Seq.t</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="label">f</span>:<span>(<span><span class="