title: Lazy services in symfony not working
body: <p>I am trying to lazy a database service from <code>services.yml</code> but it doesn't seem to show anything on doing this:</p>
  
  <pre><code>$db= $this-&gt;container-&gt;get('database');
  var_dump(class_implements($db));
  </code></pre>
  
  <p>I did both:</p>
  
  <pre><code> composer require ocramius/proxy-manager
   composer require symfony/proxy-manager-bridge
  </code></pre>
  
  <p>and </p>
  
  <pre><code>services:
     database:
       class: Namespace\Database
       lazy:  true
  </code></pre>
  
  <p>It returns just an empty array. What could I be doing wrong?</p>
  
  <p>P.S. I am using the components from Symfony and not the whole framework.</p>