It doesn't ends with world's famine, but at least allows you to mark some methods of your ruby objects as deprecated and they will spit a warning every time you access them.
I think it has room for more - have you any idea to share?
install with gem install canivete or grab source code here
edit: I needed to change the name from ruutils as a gem with a very similar name exists (rutils) - thanks for pointing out jastix.