</code> uses equivalent? to match the
selector to the targets, evaluating the body associated with the first matching target.
If a target is a list or vector, the elements are checked item by item.
Each target, or element of a list or vector can be a pattern.  Patterns
are of the form #&lt;whatever&gt; (undefined constants from s7's pointer of view).
A pattern can be:
</p>
<samp>
<ul>
<li>#&lt;&gt;               any expr matches
<li>#&lt;func&gt;           expr matches if (func expr)
<li>#&lt;label:func&gt;