[ruby-core:74542] [Ruby trunk Bug#12216] Class inherited Singleton method exclude argument from protected method accessing

Issue #12216 has been reported by Adam Luzsi.

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Bug #12216: Class inherited Singleton method exclude argument from protected method accessing
https://bugs.ruby-lang.org/issues/12216

* Author: Adam Luzsi
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 1.8.7-p375 && 1.9 && 2.+
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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Dear Ruby Lang developers.

I would like to ask about why the following code can work? 

Or is it a valid scenario and "as expected" behavior to ignore public call on a protected method. 

Thank you guys for the brilliant!


<pre><code class="ruby">

class A

  class << self

    def inherited(klass)
      p klass.protected_method_call
    end

    protected
    def protected_method_call
      self.to_s
    end
  end

end


class B < A

end

# output: "B"

</code></pre>



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