title: Scala extractors - skip unused parameters
body: <p>given following code:</p>
  
  <pre><code>abstract class MyTuple
  
  ... 
  
  case class MySeptet(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int, g: Int) extends MyTuple
  
  case class MyOctet(a: Int, b: Int, c: Int, d: Int, e: Int, f: Int, g: Int, h: Int) extends MyTuple
  
  ...
  </code></pre>
  
  <p>When using generated extractor, is it possible to skip remaining parameters, supposing they're unused ?</p>
  
  <p>e.g. I don't want to write plenty of underscores in the following code snippet:</p>
  
  <pre><code>case MyOctet(a, b, _, _, _, _, _, _) =&gt; ... // uses only a and b
  </code></pre>