="typedecl"><a name="type-af_constraint">af_constraint()</a></h3>
<p><tt>af_constraint() = <a href="#type-af_guard">af_guard()</a></tt></p>
<p>  Boolean constraint expression abstract form.</p>

<h3 class="typedecl"><a name="type-af_exit">af_exit()</a></h3>
<p><tt>af_exit() = {exit, <a href="#type-line">line()</a>, <a href="#type-af_variable">af_variable()</a>, <a href="#type-abstract_expr">abstract_expr()</a>}</tt></p>


<h3 class="typedecl"><a name="type-af_filter">af_filter()</a></h3>
<p><tt>af_filter() 