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-rw-r--r--actioncable/lib/action_cable/server/worker.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable/server/worker.rb b/actioncable/lib/action_cable/server/worker.rb
index 43639c27af..c69cc4ac31 100644
--- a/actioncable/lib/action_cable/server/worker.rb
+++ b/actioncable/lib/action_cable/server/worker.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "active_support/callbacks"
require "active_support/core_ext/module/attribute_accessors_per_thread"
require "concurrent"