From: Jim Cain <list@...>
Date: 2003-07-19T01:41:29+09:00
Subject: attr_accessor calls method_added twice for each method in 1.8

This code:

module Mymodule
    def Mymodule.append_features(klass)
       super(klass)
       klass.module_eval do
          def self.method_added(meth)
             puts "method #{name}.#{meth.to_s} added"
          end
       end
    end
end

class Myclass
    include Mymodule
    attr_accessor :hello
end

outputs this in 1.8:

method Myclass.hello added
method Myclass.hello added
method Myclass.hello= added
method Myclass.hello= added

but outputs this in 1.6.8:

method Myclass.hello added
method Myclass.hello= added

Looking in eval.c, both rb_attr and rb_add_method call klass#method_added.