s=identifier>factor</span><span class=special>) </span><span class=special>| </span><span class=special>(</span><span class=literal>'/' </span><span class=special>&gt;&gt; </span><span class=identifier>factor</span><span class=special>)),
                    </span><span class=identifier>factor      </span><span class=special>= </span><span class=identifier>integer </span><span class=special>| </span><span class=identifier>group</span><span class=special>,
                    </span><span class=identifier>g