title: How to use Ember.RSVP.onerror to report exceptions from rejected promises without error handlers
body: <p>I just watched this <a href="http://www.youtube.com/watch?v=L9OOMygo1HI" rel="nofollow noreferrer">video</a> of a recent panel discussion with the ember-core framework developers.</p>
  
  <p>In the video the panel members are eached asked to share one general debugging tip -- Tom Dale calls out the RSVP onerror handler which makes it possible to globally report exceptions which would have otherwise been swallowed in promises without rejection handlers.</p>
  
  <p>I think this handler will answer a (somewhat confused) question I asked elsewhere on Stack Overflow.  Does anyone know how to use this handler or where the docs for it might be?</p>
  
  <p><a href="https://stackoverflow.com/questions/17866672/acceptable-promise-pattern-for-loud-errors/17873950#17873950">acceptable promise pattern for &#39;LOUD&#39; errors?</a></p>