le="color:#66d9ef">:</span> <span style="color:#66d9ef">String</span><span style="color:#f92672">,</span> qty<span style="color:#66d9ef">:</span> <span style="color:#66d9ef">Int</span><span style="color:#f92672">)</span>

<span style="color:#66d9ef">case</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">Cart</span><span style="color:#f92672">(</span>items<span style="color:#66d9ef">:</span> <span style="color:#66d9ef">Seq</span><span style="color:#f92672">[</span><span style="color