title: Can react components be named with numbers?
body: <p>I don't remember where, I saw a router using a 404 component like this</p>
  
  <pre><code>&lt;Route component={404}/&gt;
  </code></pre>
  
  <p>I have tried creating a component</p>
  
  <pre><code>const 404 = props =&gt; {
    return (&lt;h1&gt;This is a 404 page!&lt;/h1&gt;)
  }
  </code></pre>
  
  <p>And it doesn't even compile. I am using create-react-app and React Router.</p>