From: Calamitas <calamitates@...>
Date: 2006-12-20T00:10:35+09:00
Subject: Re: [ ruby-Bugs-6820 ] #ancestors never includes the singleton class (inconsistent)

On 12/19/06, Yukihiro Matsumoto <matz@ruby-lang.org> wrote:
> I just remembered I made decision that singleton classes (or
> eigenclasses) were "real" anonymous classes rather than theoretical
> place holder.  That means having singleton classes in ancestors list
> makes sense.  I will change the behavior in the future.
>
> This is a step toward eigenclass method.

Then would you consider making the following changes as well?

* Return singleton classes from ObjectSpace#each_object
* Call Class#inherited when singleton classes are created
* "Fix" Class#superclass for the singleton class of a class:
    class A ; end
    class B < A ; end
    c = class << B ; self ;end   #=> #<Class:B>
    c = c.superclass   #=> #<Class:Class>
    c = c.superclass   #=> #<Class:Class>
    ...
  I'd expect to see the sequence #<Class:B>, #<Class:A>,
  #<Class:Object>, Class, Module, Object, nil. That is the way
  1.9 behaves, except that BasicObject is the root of the hierarchy,
  and that BasicObject#superclass raises a TypeError.

Peter