[ruby-core:54977] [Backport93 - Backport #8284] Expected behavior of Module#public_class_method

Issue #8284 has been updated by usa (Usaku NAKAMURA).


Something is missing to backport the patch to ruby_1_9_3.
I'll check it later. 
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Backport #8284: Expected behavior of Module#public_class_method
https://bugs.ruby-lang.org/issues/8284#change-39327

Author: jacknagel (Jack Nagel)
Status: Assigned
Priority: Normal
Assignee: usa (Usaku NAKAMURA)
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?


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