ActiveSupport needs ActiveRecord

I'm using Rails 3 from master under ruby 1.8.7. I'm not using ActiveRecord. But AS "knows" about AR, while it shouldn't.
It does this in line 29:

http://github.com/rails/rails/blob/master/activesupport/lib/active_...

which crashes my app like this:

http://gist.github.com/319518

After changing it to check for whole ActiveRecord::Base (which is my temporary fix, AS shouldn't know about existence of AR at all), it goes further but then crashes in similar way when ActionMailer::Base can't be found, see line 101:

http://github.com/rails/rails/blob/master/railties/lib/rails/engine...

It was working yesterday (1st March), broke after "bundle install" which fetched new commits from master.