title: How to use RSpec's should_raise with any kind of exception?
body: <p>I'd like to do something like this:</p>
  
  <pre><code>some_method.should_raise &lt;any kind of exception, I don't care&gt;
  </code></pre>
  
  <p>How should I do this?</p>
  
  <pre><code>some_method.should_raise exception
  </code></pre>
  
  <p>... doesn't work.</p>