ass="keyword">val</span> channel_in : 
  <span><span class="xref-unresolved">Stdlib</span>.in_channel <span class="arrow">&#45;&gt;</span></span>
  <span><span><span>(<a href="#type-stdin">stdin</a>, <span class="type-var">'stdout</span>, <span class="type-var">'stderr</span>)</span> <a href="../Core/Cmd/index.html#type-t">Cmd.t</a></span> <span class="arrow">&#45;&gt;</span></span>
  <span><span>(<a href="#type-channel">channel</a>, <span class="type-var">'stdout</span>, <span class="type-var">'stderr</spa