process_action accepts multiple args, even with Callbacks.

actionpack/lib/abstract_controller/callbacks.rb

@@ -13,7 +13,7 @@ module Callbacks
 
     # Override AbstractController::Base's process_action to run the
     # process_action callbacks around the normal behavior.
-    def process_action(method_name)
+    def process_action(method_name, *args)
       run_callbacks(:process_action, method_name) do
         super
       end

actionpack/test/abstract/callbacks_test.rb

@@ -245,6 +245,27 @@ class TestHalting < ActiveSupport::TestCase
         assert_equal "Success", controller.response_body
       end
     end
+
+    class CallbacksWithArgs < ControllerWithCallbacks
+      set_callback :process_action, :before, :first
+
+      def first
+        @text = "Hello world"
+      end
+
+      def index(text)
+        self.response_body = @text + text
+      end
+    end
+
+    class TestCallbacksWithArgs < ActiveSupport::TestCase
+      test "callbacks still work when invoking process with multiple args" do
+        controller = CallbacksWithArgs.new
+        result = controller.process(:index, " Howdy!")
+        assert_equal "Hello world Howdy!", controller.response_body
+      end
+    end
+
 
   end
 end