AS Json parse_error makes a return for backwards compatibility, although it...

AS Json parse_error makes a return for backwards compatibility, although it will return MultiJson::DecodeError

activesupport/lib/active_support/json/decoding.rb

@@ -34,6 +34,10 @@ def with_backend(name)
         self.backend = old_backend
       end
 
+      def parse_error
+        MultiJson::DecodeError
+      end
+
       private
 
       def convert_dates_from(data)

activesupport/test/json/decoding_test.rb

@@ -82,7 +82,7 @@ class TestJSONDecoding < ActiveSupport::TestCase
   end
 
   def test_failed_json_decoding
-    assert_raise(MultiJson::DecodeError) { ActiveSupport::JSON.decode(%({: 1})) }
+    assert_raise(ActiveSupport::JSON.parse_error) { ActiveSupport::JSON.decode(%({: 1})) }
   end
 end