><code class="language-swift">case enclosingMark</code></div></div><div id="error-cb5e100e5a9a3e7f6d1fd97512215282" class="declaration"><a class="toggle-link" href="#comment-error-cb5e100e5a9a3e7f6d1fd97512215282">case error</a> <span class="required">Required</span><div class="comment collapse in" id="comment-error-cb5e100e5a9a3e7f6d1fd97512215282"><p>An encoding error was detected.</p>
<p><code>length</code> is the number of underlying code units consumed by this
error, guaranteed to be greater than 0.</p