lib/active_support/dependencies.rb in activesupport-2.3.9.pre vs lib/active_support/dependencies.rb in activesupport-2.3.9

@@ -1,4 +1,6 @@
+require 'thread'
+
 module ActiveSupport #:nodoc:
   module Dependencies #:nodoc:
     extend self
 
     # Should we turn on Ruby warnings on the first load of dependent files?