            <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="nf">fetchTileFromServer</span><span class="p">(</span><span class="n">at</span> <span class="nv">path</span><span class="p">:</span> <span class="kt">MKTileOverlayPath</span><span class="p">,</span>
                         <span class="n">failure</span> <span class="nv">fail</span><span class="p">:</span> <span class="p">((</span>