ast-in first-out stacks.
<p>

   This module implements stacks (LIFOs), with in-place modification.<br>
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<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type">'a</code> t</span> </pre>
<div class="info ">
The type of stacks containing elements of type <code class="code"><span class="keywordsign">'</span>a</code>.<br>
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<pre><span id="EXCEPTIONEmpty"><span class="keyword">exception</span> Empty</span></pre>
<div class="info ">
Raised when <a href="Stac