n class="kt">I2</span><span class="p">,</span> <span class="nv">resultSelector</span><span class="p">:</span> <span class="kd">@escaping</span> <span class="p">(</span><span class="kt">I1</span><span class="o">.</span><span class="kt">Element</span><span class="p">,</span> <span class="kt">I2</span><span class="o">.</span><span class="kt">Element</span><span class="p">)</span> <span class="k">throws</span> <span class="o">-&gt;</span> <span class="kt">Element</span><span class="p">)</span>
        <span cla