n>
        occur. For our example above, when you get a <code class="computeroutput"><span class="char">'{'</span></code>,
        you definitely must see an <code class="computeroutput"><span class="identifier">int_</span></code>
        next. After that, you definitely must have a <code class="computeroutput"><span class="char">','</span></code>
        next and then a <code class="computeroutput"><span class="identifier">person</span></code> and
        so on until the final <code class="computeroutput">