t</span> <span class="special">=</span> <span class="identifier">parse</span><span class="special">(</span><span class="identifier">input</span><span class="special">,</span> <span class="identifier">positions</span><span class="special">);</span>
</pre>
<p>
        We now have an AST, <code class="computeroutput"><span class="identifier">ast</span></code>,
        that contains the parsed results. Let us get the source positions of the
        2nd employee:
      </p>
<pre class="programlisting"><span clas