title: Scala @ operator
body: <p>What does Scala's @ operator do?</p>
  
  <p>For example, in the blog post <em><a href="http://szeiger.de/blog/2008/08/02/formal-language-processing-in-scala-part-2/" rel="noreferrer">Formal Language Processing in Scala, Part 2</a></em> there is a something like this</p>
  
  <pre><code>case x @ Some(Nil) =&gt; x
  </code></pre>