Explicit dependency on Module extensions

activesupport/lib/active_support/dependencies.rb

@@ -2,6 +2,9 @@
 require 'active_support/inflector'
 require 'active_support/core_ext/name_error'
 require 'active_support/core_ext/object/blank'
+require 'active_support/core_ext/module/aliasing'
+require 'active_support/core_ext/module/attribute_accessors'
+require 'active_support/core_ext/module/introspection'
 
 module ActiveSupport #:nodoc:
   module Dependencies #:nodoc: