actionpack/lib/action_controller/metal/compatibility.rb


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module ActionController
  module Compatibility
    extend ActiveSupport::Concern

    # Temporary hax
    included do
      self.protected_instance_variables = [
        :@_status, :@_headers, :@_params, :@_env, :@_response, :@_request,
        :@_view_runtime, :@_stream, :@_url_options, :@_action_has_layout
      ]
    end
  end
end