From: Shugo Maeda <redmine@...>
Date: 2009-11-16T14:26:23+09:00
Subject: [ruby-core:26761] [Bug #2375] protected singleton methods can be called from other instances

Bug #2375: protected singleton methods can be called from other instances
http://redmine.ruby-lang.org/issues/show/2375

Author: Shugo Maeda
Status: Open, Priority: Low
Assigned to: Yukihiro Matsumoto
ruby -v: 1.9.2dev

It seems that protected singleton methods of an object can be called from other instances of the class of the object.

  class Foo
  end
  
  FOO = Foo.new
  
  class << FOO
    protected
  
    def bar
      puts "bar"
    end
  end
  
  class Foo
    def baz
      FOO.bar
    end
  end
  
  FOO.baz
  Foo.new.baz # CRuby does not raise NoMethodError, but IronRuby does.

On IronRuby, Foo.new.baz raies NoMethodError, and I guess it's more reasonable than the behavior of CRuby.  I have attached a patch.

However, I haven't been able to find any use cases of protected singleton methods.


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