> <span>&#45;&gt;</span> <span><a href="../../IR/Const/index.html#type-t">IR.Const.t</a> option</span></code></dt><dt class="spec value" id="val-eval_boolean_exp"><a href="#val-eval_boolean_exp" class="anchor"></a><code><span class="keyword">val</span> eval_boolean_exp : <a href="AccessExpression/index.html#type-t">AccessExpression.t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span>bool option</span></code></dt><dd><p><code>eval_boolean_exp var exp</code> returns <co