[ruby-core:79787] [Ruby trunk Bug#13249] Access modifiers don't have an effect inside class methods in Ruby >= 2.3

Issue #13249 has been updated by Andrei Botalov.

Description updated

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Bug #13249: Access modifiers don't have an effect inside class methods in Ruby >= 2.3
https://bugs.ruby-lang.org/issues/13249#change-63212

* Author: Andrei Botalov
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.3.0, 2.4.0
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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Simple example:

~~~ ruby
class C
  def self.foo
    private
    def bar
    end
  end
end
C.foo
C.new.bar
~~~

This code runs fine on Ruby 2.3 and Ruby 2.4. It raises NoMethodError on Ruby 2.2 and prior versions.
I would expect an error to be raised.

Here is some code that actually uses private access modifier inside a class method - https://github.com/evolve75/RubyTree/blob/db48c35b0a3b96e4da473b095cc00e454d8a9996/lib/tree/utils/camel_case_method_handler.rb#L60

By the way, this code raises an error as expected on Ruby 2.3 and Ruby 2.4:

~~~ ruby
class C
  def self.foo
    private def bar
    end
  end
end
C.foo
C.new.bar # NoMethodError: private method `bar' called
~~~




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