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-rw-r--r--activesupport/lib/active_support/callbacks.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/callbacks.rb b/activesupport/lib/active_support/callbacks.rb
index 37f9494272..08520b1077 100644
--- a/activesupport/lib/active_support/callbacks.rb
+++ b/activesupport/lib/active_support/callbacks.rb
@@ -5,6 +5,7 @@ require 'active_support/core_ext/class/attribute'
require 'active_support/core_ext/kernel/reporting'
require 'active_support/core_ext/kernel/singleton_class'
require 'active_support/core_ext/string/filters'
+require 'active_support/deprecation'
require 'thread'
module ActiveSupport