vendor/rails/activesupport/lib/active_support/core_ext/class.rb

   1 require 'active_support/core_ext/class/attribute_accessors'
   2 require 'active_support/core_ext/class/inheritable_attributes'
   3 require 'active_support/core_ext/class/removal'
   4 require 'active_support/core_ext/class/delegating_attributes'