=number>1</span><span class=special>&gt; </span><span class=identifier>d</span><span class=special>;

    </span><span class=special>(                       </span><span class=comment>// outer subrule group, scope of a and b
        </span><span class=identifier>a </span><span class=special>= </span><span class=identifier>ch_p</span><span class=special>(</span><span class=literal>'a'</span><span class=special>),
        </span><span class=identifier>b </span><span class=special>=
        </span><span class=