rails/rails — pull request #4654 by pwim (2012-01-25 02:20:05+00:00)
Title: Explicit deprecation require

Requiring 'active_model/naming' will raise an uninitialized constant
ActiveSupport::Deprecation exception because the module core extension
doesn't require 'active_support/deprecation'. This require cannot be
added to the core extension because of circular dependency issues.