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-rw-r--r--test/psych/visitors/test_depth_first.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/psych/visitors/test_depth_first.rb b/test/psych/visitors/test_depth_first.rb
index 837c8e8c117..8072c26b579 100644
--- a/test/psych/visitors/test_depth_first.rb
+++ b/test/psych/visitors/test_depth_first.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'psych/helper'
module Psych