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-rw-r--r--actioncable/lib/action_cable/connection/stream.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable/connection/stream.rb b/actioncable/lib/action_cable/connection/stream.rb
index e620b93845..4873026b71 100644
--- a/actioncable/lib/action_cable/connection/stream.rb
+++ b/actioncable/lib/action_cable/connection/stream.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "thread"
module ActionCable