<span class="special">)</span> <span class="special">=</span> <span class="identifier">_1</span>
</pre>
<p>
          This assigns the parsed result (actually, the attribute of <code class="computeroutput"><span class="identifier">double_</span></code>) to n. <code class="computeroutput"><span class="identifier">ref</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span></code>
          tells Phoenix that <code class="computeroutput"><span class="identifier">n</s