[ruby-core:80756] [Ruby trunk Bug#13249][Assigned] Access modifiers don't have an effect inside class methods in Ruby >= 2.3

[shyouhei@ruby-lang.org]

Issue #13249 has been updated by shyouhei (Shyouhei Urabe).

Status changed from Open to Assigned
Assignee set to ko1 (Koichi Sasada)

We looked at this issue in yesterday's developer meeting.

The use of private in evolve75/RubyTree shown in the description is in fact wrong (methods are defined in a wrong place).  That example made us think that the use of private in a method is a code smell.

We would forbid such usage in a future.  For the time being, let us show warning message.

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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-64312

* Author: abotalov (Andrei Botalov)
* Status: Assigned
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* Target version: 
* ruby -v: 2.3.0, 2.4.0
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
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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