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-rw-r--r--test/benchmark/stack.ru1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/benchmark/stack.ru b/test/benchmark/stack.ru
index fc9193f..17a565b 100644
--- a/test/benchmark/stack.ru
+++ b/test/benchmark/stack.ru
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 run(lambda { |env|
   body = "#{caller.size}\n"
   h = {