s=special>(</span><span class=identifier>expr</span><span class=special>);
</span></code></pre>
<p> <img src="theme/note.gif" width="16" height="16"> Be sure to add the macros <strong>inside</strong> the grammar definition's constructor. Now here's a sample session with the calculator.</p>

<pre><code>    <span class="preprocessor">Type an expression...or [q or Q] to quit</span>

    <span class="preprocessor">1 + 2</span>

    grammar(calc):	"1 + 2"
      rule(expression):	"1 + 2"
        rule(term):	"1 + 