w the default <code>loading</code> event handlers are implemented,
the default <code>error</code> handlers will look for an appropriate error substate to
enter, if one can be found.</p>
<div class="filename javascript"><div class="ribbon"></div><span>app/router.js</span><pre class="language-javascript line-numbers"><code class="javascript language-javascript">Router<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token keywor