e>eval</code> and <code>apply</code>.</li>
<li>The <code>application?</code> clause of <code>eval</code> becomes:</li>
</ul>
<pre><code class="codeblock">((application? exp)
 (<span class="fu">apply</span> (actual-value (operator exp) env)
        (operands exp)
        env))</code></pre>
<ul>
<li>Whenever we need the actual value of an expression, we force in addition to evaluating:</li>
</ul>
<pre><code class="codeblock">(<span class="kw">define</span> (actual-value exp env) (force-it (<span class="fu">ev