included

# File actionpack/lib/action_controller/helpers.rb, line 6
    def self.included(base)
      # Initialize the base module to aggregate its helpers.
      base.class_inheritable_accessor :master_helper_module
      base.master_helper_module = Module.new

      # Set the default directory for helpers
      base.class_inheritable_accessor :helpers_dir
      base.helpers_dir = (defined?(RAILS_ROOT) ? "#{RAILS_ROOT}/app/helpers" : "app/helpers")

      # Extend base with class methods to declare helpers.
      base.extend(ClassMethods)

      base.class_eval do
        # Wrap inherited to create a new master helper module for subclasses.
        class << self
          alias_method_chain :inherited, :helper
        end
      end
    end