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<h1>Module gen_eval</h1>
<ul class="index"><li><a href="#description">Description</a></li><li><a href="#types">Data Types</a></li><li><a href="#index">Function Index</a></li><li><a href="#functions">Function Details</a></li></ul>Module description (becomes module heading).

<p><b>This module defines the <tt>gen_eval</tt> behaviour.</b><br> Required callback functions: <tt>visit/2</tt>.</