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-rw-r--r--test/ruby/test_thread.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index e0c61c66f5..dc929ce4fd 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -1,4 +1,5 @@
# -*- coding: us-ascii -*-
+# frozen_string_literal: false
require 'test/unit'
require 'thread'