title: No SUCCESS constant in Command class
body: <p>I am developing a Symfony 4 command and when it finishes I want to return with a success or failure code.</p>
  <p><a href="https://symfony.com/doc/current/console.html" rel="nofollow noreferrer">Here</a> is the documentation.</p>
  <p>It says:</p>
  <pre><code>// return this if there was no problem running the command
  // (it's equivalent to returning int(0))
  return Command::SUCCESS;
  </code></pre>
  <p>using <code>Symfony\Component\Console\Command\Command</code>.</p>
  <p>I've checked that file, and there is no <code>SUCCESS</code> constant.</p>
  <p>Am I miss something?</p>