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-rw-r--r--test/thread/test_sync.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/thread/test_sync.rb b/test/thread/test_sync.rb
index 9509cac6c74..e576fc1d323 100644
--- a/test/thread/test_sync.rb
+++ b/test/thread/test_sync.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'sync'
require 'timeout'