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-rw-r--r--actioncable/lib/action_cable/channel/base.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable/channel/base.rb b/actioncable/lib/action_cable/channel/base.rb
index 718f630f58..ca812e80d2 100644
--- a/actioncable/lib/action_cable/channel/base.rb
+++ b/actioncable/lib/action_cable/channel/base.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "set"
module ActionCable