rails/rails — pull request #14271 by akshay-vishnoi (2014-03-04 10:12:21+00:00)
Title: Fix - Class#superclass_delegating_accessor

```ruby
class TestClass
superclass_delegating_accessor :test_attribute
end

# Before
TestClass.private_methods.include?(:_test_attribute) # => false
TestClass.private_methods.include?(:_test_attribute=) # => false

# After
TestClass.private_methods.include?(:_test_attribute) # => true
TestClass.private_methods.include?(:_test_attribute=) # => true
```