>
<div class="summary" role="doc-abstract">
    <p>Begin a promise chain</p>

</div>
<h4>Parameters</h4>

<table class="parameters">
  <thead hidden>
  <tr>
      <th>Name</th>
      <th>Type</th>
      <th>Description</th>
  </tr>
  </thead>
  <tbody>
    <tr>
    <th>queue</th>
    <td><code class="type">Dispatch​Queue</code></td></td>
    <td><p>dispatch queue to start the chain on</p>
</td>
</tr>
<tr>
    <th>handler</th>
    <td><code class="type">@escaping () throws -&gt; A</code></td></td>
    <td>