lib/action_callback/callback.rb in action_callback-0.1.0 vs lib/action_callback/callback.rb in action_callback-0.2.0

@@ -1,4 +1,6 @@
+require 'set'
+
 module Callback
   # The chain should have each method that has callback as key
   # and each callback points to a hash with :before, :after as key
   # each of those keys points to an array of callbacks
   # {
\ No newline at end of file