There's apparently a circular loading issue in Rails 3 (any helper loads
ActionView::Helpers with loads all helpers).

In this case, you probably don't need the two helper requires; just
remove them:

-  require 'action_view/helpers/asset_tag_helper'
-  require 'action_view/helpers/tag_helper'

Alternatively (e.g. if you run into problems and actually need to
include them), you replace them with a single require:

+  require 'action_view/helpers'

Note that this require will fail in Rails 2.x though.

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