s=identifier>Match2T</span><span class=special>&gt;
        </span><span class=keyword>void
        </span><span class=identifier>concat_match</span><span class=special>(</span><span class=identifier>Match1T</span><span class=special>&amp; </span><span class=identifier>l</span><span class=special>, </span><span class=identifier>Match2T </span><span class=keyword>const</span><span class=special>&amp; </span><span class=identifier>r</span><span class=special>) </span><span class=keyword>const
        </span><