From: Renald Buter <buter@...>
Date: 2005-03-09T18:06:14+09:00
Subject: Module#dup and Module.remove_method question

Hello,

I have a question about Module#dup and Module.remove_method. 

Say I have the following:

 > module A
 >  def self.foo; puts "A::foo; end
 > end

 > B = A.dup
 > B.foo 
 "A::foo"
 => nil

But now I want to remove foo from A's duplicate:

 > class <<B; remove_method :foo; end
   NameError: method `foo' not defined in Module
         from (irb):37:in `remove_method'
         from (irb):37

Ah? Well OK, let's remove it from A then.

 > class <<A; remove_method :foo; end
 => #<Class:A>

Let's test it:

 > A.foo
 NoMethodError: undefined method `foo' for A:Module
        from (irb):40
        irb(main):041:0>

That works. BUT:

 > B.foo
 "A::foo"
 => nil

This, I do not understand: where does B.foo live, now and why can't I
remove it?

Regards,

Renald