I have built ruby-1.9.1 for [testing]. As far as I can tell, the only thing that is broken is gvim. A dev who uses that will want to look into fixing it... I hear there is a patch floating around for ruby-1.9 support but not sure if it is now included upstream. You can always use IgnorePkg until it is fixed.
(Lets see if gvim users complain more than the ruby users have...)