ul to refactor things like <code>List.map f |&gt; List.map g</code> into <code>List.map (f %&gt; g)</code>.</p><p>The trivial definition is <code>x |&gt; (f %&gt; g) = x |&gt; f |&gt; g</code></p></dd></dl><dl><dt class="spec value" id="val-tee"><a href="#val-tee" class="anchor"></a><code><span class="keyword">val</span> tee : <span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> unit)</span> <span>&#45;&gt;</span> <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'a</s