[ruby-core:54442] [Backport 200 - Backport #8284] Expected behavior of Module#public_class_method

Issue #8284 has been updated by jacknagel (Jack Nagel).


It does:

irb(main):001:0> RUBY_DESCRIPTION
=> "ruby 2.1.0dev (2013-04-19 trunk 40359) [i386-darwin10.8.0]"
irb(main):002:0> Object.define_method
NoMethodError: private method `define_method' called for Object:Class
	from (irb):2
	from /Users/jacknagel/.rubies/ruby-2.1.0-dev/bin/irb:12:in `<main>'
irb(main):003:0> module Foo; public_class_method :define_method; end
=> Foo
irb(main):004:0> Object.define_method
NoMethodError: private method `define_method' called for Object:Class
	from (irb):4
	from /Users/jacknagel/.rubies/ruby-2.1.0-dev/bin/irb:12:in `<main>'

----------------------------------------
Backport #8284: Expected behavior of Module#public_class_method
https://bugs.ruby-lang.org/issues/8284#change-38718

Author: jacknagel (Jack Nagel)
Status: Assigned
Priority: Normal
Assignee: nagachika (Tomoyuki Chikanaga)
Category: 
Target version: 


It was pointed out by Myron Marston (here: https://gist.github.com/myronmarston/5401829) that calling public_class_method on an anonymous module makes the named method public on Object, etc.

Object.define_method => NoMethodError
Module.new.public_class_method(:define_method)
Object.define_method => ArgumentError

Also of note, the same is not true when calling it on a class:

Object.define_method => NoMethodError
Class.new.public_class_method(:define_method)
Object.define_method => NoMethodError

which seems inconsistent given:

Module.new.singleton_class.ancestors => [Module, Object, Kernel, BasicObject]
Class.new.singleton_class.ancestors    => [Class, Module, Object, Kernel, BasicObject]


Is this a bug or expected behavior? If the latter, what is the correct explanation?


-- 
http://bugs.ruby-lang.org/