From: akr@...
Date: 2014-06-07T02:41:14+00:00
Subject: [ruby-core:62973] [ruby-trunk - Bug #5828] [Closed] Non anonymous classes can't be frozen, cloned and then inspected

Issue #5828 has been updated by Akira Tanaka.

Status changed from Feedback to Closed
% Done changed from 0 to 100

Applied in changeset r46370.

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* object.c (rb_mod_initialize_clone): Override Kernel#initialize_clone
  to avoid an exception on Class.new.freeze.clone.to_s.
  Reported by Andrew Grimm.  [ruby-core:41858] [Bug #5828]

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Bug #5828: Non anonymous classes can't be frozen, cloned and then inspected
https://bugs.ruby-lang.org/issues/5828#change-47068

* Author: Andrew Grimm
* Status: Closed
* Priority: Low
* Assignee: Akira Tanaka
* Category: 
* Target version: 
* ruby -v: ruby 2.0.0dev (2011-11-27 trunk 33860) [x86_64-darwin10.8.0] 
* Backport: 
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=begin
If you assign a class to a constant (that is, it isn't anonymous), and you freeze it and then clone it, you can't call to_s on it.

    MyClass = Class.new ; MyClass.freeze.clone.to_s
    RuntimeError: can't modify frozen Class
    	from (irb):1:in `to_s'
    	from (irb):1
    	from /Users/agrimm/.rvm/rubies/ruby-head/bin/irb:16:in `<main>'

    MyConstantObject = Object.new ; MyConstantObject.freeze.clone.to_s # => "#<Object:0x00000100884d60>"
    MyClass_2 = Class.new ; MyClass_2.clone.to_s # => "#<Class:0x00000100872930>"
    MyClass_3 = Class.new ; MyClass_3.freeze.to_s # => "MyClass_3" 
    MyClass_4 = Class.new.freeze ; MyClass_4.clone.to_s # => "#<Class:0x0000010088d4d8>" 
    MyClass_5 = Class.new.freeze ; MyClass_5.freeze.clone.to_s # => An exception
    local_variable_class = Class.new ; local_variable_class.freeze.clone.to_s # => "#<Class:0x00000100964028>" 

Presumably this is caused by class only determining whether it's assigned to a constant when it's first inspected.

I don't have a use case for freezing and cloning a class.
=end





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