Rails - Feb 2009 - ActionController::Caching::Sweeper not autoloading in 2.3.0 RC1

Just updated to 2.3.0 RC1 and I''m finding that my sweepers are
throwing NameErrors (uninitialized constant
ActionController::Caching::Sweeper) when evaluation reaches lines like
this one:

  class PostSweeper < ActionController::Caching::Sweeper

This only happens in the development environment, because that''s the
only environment where I have "cache_classes" set to false. Relevant
stack trace is:

  vendor/rails/activesupport/lib/active_support/dependencies.rb:440:in
`load_missing_constant''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:80:in
`const_missing''
  app/sweepers/post_sweeper.rb:1
  vendor/rails/activesupport/lib/active_support/dependencies.rb:380:in
`load_without_new_constant_marking''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:380:in
`load_file''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in
`new_constants_in''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:379:in
`load_file''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:259:in
`require_or_load''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:425:in
`load_missing_constant''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:80:in
`const_missing''
  vendor/rails/activesupport/lib/active_support/dependencies.rb:92:in
`const_missing''
  vendor/rails/actionpack/lib/action_controller/caching/sweeping.rb:
43:in `const_get''
  vendor/rails/actionpack/lib/action_controller/caching/sweeping.rb:
43:in `cache_sweeper''
  vendor/rails/actionpack/lib/action_controller/caching/sweeping.rb:
41:in `each''
  vendor/rails/actionpack/lib/action_controller/caching/sweeping.rb:
41:in `cache_sweeper''
  app/controllers/posts_controller.rb:5

I can get rid of the error by manually adding the following at the top
of the sweeper file:

  require
''rails/actionpack/lib/action_controller/caching/sweeping''

But that''s really bizarre, because I can see from the stack trace that
that file has already been evaluated!

Any idea what''s going on here? I created a fresh Rails app and tried
to make a minimal test case but wasn''t able to reproduce, so
there''s
something subtle going on.

Cheers,
Wincent
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I''ve done a bit more digging and narrowed down the source of the bug.
See:

  http://rails.lighthouseapp.com/projects/8994/tickets/1977

Cheers,
Wincent
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