SamSaffron/vestal_versions — pull request #1 by chancancode (2013-11-30 05:39:26+00:00)
Title: Don't use conflicting module names - messes up 'included' blocks, etc

It seems like you need this patch for this to work with Rails master, due to some of the changes in ActiveSupport internals.

See laserlemon/vestal_versions#90.

As far as I can tell this is most likely not a bug in Rails but more like unsupported or undefined behaviour.