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-rw-r--r--activesupport/lib/active_support/dependencies.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb
index 2badad5f5f..6148e59207 100644
--- a/activesupport/lib/active_support/dependencies.rb
+++ b/activesupport/lib/active_support/dependencies.rb
@@ -1,3 +1,5 @@
+require 'set'
+
module ActiveSupport #:nodoc:
module Dependencies #:nodoc:
extend self