Comment by anonymoushn

Sweet, where do I download it/which obscure flag to I pass to enable it?

  27 stackframes outside of the mutually recursive calls
  java.lang.StackOverflowError
	at TCO$.mutuallyRecursiveAdd2(<console>:22)

Oddly, your Thread.currentThread.getStackTrace.length seems to return strings like "We have 30". Mine is returning an Int over here.