No more filter chain halted messages?

I've been trying to debug test failures when converting my project to
rails 3, and I noticed that controllers are redirecting inside of
before filters. It's very difficult to figure out which of my 8
before_filters caused the unexpected redirect, however, since the
"filter chain halted as XXX rendered or redirected" message is MIA. I
read through the new ActiveSupport::Callbacks code and see that it
would be difficult to instrument in this way.

Temporarily, I added this:

            filter = <<-RUBY_EVAL
              unless halted
                result = #{@filter}
                halted = (#{chain.config[:terminator]})
                Rails.logger.debug("Filter chain #{@kind.to_s} halted:
#{@filter}") if halted
              end
            RUBY_EVAL

But I know that's not even going to be syntactically valid in a lot of
cases, and ActiveSupport::Callbacks shouldn't even use the
Rails.logger. Anybody got any ideas here? This feature was really
valuable in debugging requests terminating in unexpected filters...

-David Stevenson
Pivotal Labs