attr_internal_define

# File activesupport/lib/active_support/core_ext/module/attr_internal.rb, line 28
    def attr_internal_define(attr_name, type)
      internal_name = attr_internal_ivar_name(attr_name).sub(/\A@/, '')
      # class_eval is necessary on 1.9 or else the methods are made private
      class_eval do
        # use native attr_* methods as they are faster on some Ruby implementations
        send("attr_#{type}", internal_name)
      end
      attr_name, internal_name = "#{attr_name}=", "#{internal_name}=" if type == :writer
      alias_method attr_name, internal_name
      remove_method internal_name
    end