From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-02-04T00:51:57+09:00
Subject: Fun with singletons' singleton classes


Abusing the language:

batsman@tux-chan:/tmp$ expand -t 2 g.rb
class A
  def self.method_added id
    puts "Adding method #{id} to #{self}"
  end
end

class A
  def a
  end
end

class A
  p self.id
  class << self
    p self.id
    def self.method_added id
      p self.id
      puts "Adding singleton method #{id} to #{self}"
    end
  end
end

class A
  def self.a
  end
end
batsman@tux-chan:/tmp$ ruby g.rb
Adding method a to A
538076252
538072582

I expected
Adding method a to A
538076252
538072582
XXXXXXXXX
Adding singleton method a to Class

Why is method_added not honored for singletons? Note it is perfectly
legal to define singletons' singleton methods:

>> class A
>>   class << self
>>     def self.foo
>>       puts "foo"
>>     end
>>   end
>> end
=> nil
>> class << A; foo; end
foo
=> nil

POLS would mean for me that singletons' singletons should behave as "normal"
singletons or be completely unavailable.

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