From: Shugo Maeda <redmine@...>
Date: 2009-12-05T14:55:53+09:00
Subject: [ruby-core:27060] [Bug #2443] {Object,BasicObject}.clone

Bug #2443: {Object,BasicObject}.clone
http://redmine.ruby-lang.org/issues/show/2443

Author: Shugo Maeda
Status: Open, Priority: Normal
Assigned to: Yukihiro Matsumoto
ruby -v: ruby 1.9.2dev (2009-12-04 trunk 25987) [i686-linux]

Object can be cloned in 1.8.

defiant:ruby$ ruby-1_8 -ve 'MyObject = Object.clone; p MyObject.superclass; p MyObject.new'               
ruby 1.8.8dev (2009-10-22 revision 25430) [i686-linux]
nil
#<MyObject:0xb7ceb820>

It means that there may be multiple class inheritance trees in 1.8.

However, it is not permitted in 1.9.

defiant:ruby$ ruby-trunk -ve 'MyBasicObject = BasicObject.clone; p MyBasicObject.superclass; p MyBasicObject.new'
ruby 1.9.2dev (2009-12-04 trunk 25987) [i686-linux]
-e:1:in `superclass': uninitialized class (TypeError)
	from -e:1:in `<main>'

Is it intentional?


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