module ActionView::ViewPaths::ClassMethods

def handle_deprecated_parent_prefixes # TODO: remove in 4.3/5.0.
  return unless respond_to?(:parent_prefixes)
  ActiveSupport::Deprecation.warn(<<-MSG.squish)
    Overriding `ActionController::Base::parent_prefixes` is deprecated,
    override `.local_prefixes` instead.
  MSG
  local_prefixes + parent_prefixes
end