de class="code">s</code>,
   or raises <code class="code"><span class="constructor">Empty</span></code> if the stack is empty.<br>
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<pre><span id="VALtop"><span class="keyword">val</span> top</span> : <code class="type">'a <a href="Stack.html#TYPEt">t</a> -&gt; 'a</code></pre><div class="info ">
<code class="code">top s</code> returns the topmost element in stack <code class="code">s</code>,
   or raises <code class="code"><span class="constructor">Empty</span></code> if the stack is empty.<br>
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