p>
<p><b>Authors:</b> Duncan Paul Attard.</p>

<h2><a name="description">Description</a></h2>Module description (becomes module heading).
  
<h2><a name="types">Data Types</a></h2>

<h3 class="typedecl"><a name="type-abstract_expr">abstract_expr()</a></h3>
<p><tt>abstract_expr() = <a href="#type-af_literal">af_literal()</a> | <a href="#type-af_variable">af_variable()</a> | <a href="#type-af_tuple">af_tuple</a>(<a href="#type-abstract_expr">abstract_expr()</a>) | <a href="#type-af_nil">af_nil()</a> | <a href