n class="identifier">qi</span><span class="special">::</span><span class="identifier">rule</span></code> and <code class="computeroutput"><span class="identifier">karma</span><span class="special">::</span><span class="identifier">rule</span></code>
            now can be directly initialized using their copy constructor. I.e. this
            works now: <code class="computeroutput"><span class="identifier">qi</span><span class="special">::</span><span class="identifier">rule</span><span class="special">&lt