                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="k">case</span> <span class="nf">custom</span><span class="p">((</span><span class="kt">Date</span><span class="p">)</span> <span class="k">throws</span> <span class="o">-&gt;</span> <span class="kt">String</span><span class="p">)</span></code></pre>

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