Question about xml_serialization_test

This is the same error that I got today with rev 5597 and mentioned to
Rick. I was also running with the all.sh script. (Ruby 1.8.4 on
Mac/Intel)

FWIW, here is what desc is where the code breaks:

Executing break point at
./../lib/../../activesupport/lib/active_support/dependencies.rb:400 in
`to_constant_name'
irb(Dependencies):001:0> desc
=> #<Class:Post>