title: Lambda in Ruby 1.9
body: <p>I am not following <a href="https://github.com/rack/rack/commit/2f92be21302db255f4357e95e9e1ce535b1a6a89" rel="nofollow">this change</a>. From:</p>
  
  <pre><code>longest_path_first = lambda do |host, location, _, _|
  </code></pre>
  
  <p>To:</p>
  
  <pre><code>longest_path_first = lambda do |(host, location, _, _)|
  </code></pre>
  
  <p>Can someone explain?</p>