I just ran the unit tests on some code I haven't touched since
November 2006.  The last time I checked, the unit tests ran without a
hitch, but now I'm getting lots of "warning: instance variable ... not
initialized" warnings.  The warning looks legit, but I'm confused
because I don't think I've changed anything on my end that would cause
it to suddenly appear.  Have Ruby versions released in the past year
gotten more verbose about this warning?