>'stderr</span>)</span> <a href="#type-t">t</a></span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'a</span>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span class="type-var">'a</span></span></code></div><div class="spec-doc"><p><code>let&amp;</code> is a binding operator which wrappes <a href="#val-exec"><code>exec</code></a> to provide a cleaner syntax, especially when binding multipe processes in a pipeline.</p><pre class="language-ocaml"><code>  let&amp; proc = cmd [&qu