[ruby-core:68160] [Ruby trunk - Feature #10863] [Open] allow protected class methods to be callable from instance methods

Issue #10863 has been reported by bug hit.

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Feature #10863: allow protected class methods to be callable from instance methods
https://bugs.ruby-lang.org/issues/10863

* Author: bug hit
* Status: Open
* Priority: Normal
* Assignee: 
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```ruby
class Bar
  class << self
    protected def foo_helper
    end
  end
  
  def foo
    self.class.foo_helper
  end
end
```

here, Bar::foo_helper is not intended as the api of the class, it's a helper for internal use so it should be possible to use it internally without making it public or resorting to `send`



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