Debian/unstable is moving to Ruby 1.8.5

Just a notice for others like me who are using Rails on Debian/unstable.
The Ruby packages have been updated to version 1.8.5. While this is a
good thing in general, it might be inconvenient to Rails developers as
this version of Ruby breaks breakpointer.

A workaround could be this

  http://eigenclass.org/hiki.rb?call_stack+0.1.0

I haven't tried it yet myself.

Michael