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-rw-r--r--lib/rdoc/markup/to_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/markup/to_test.rb b/lib/rdoc/markup/to_test.rb
index c51f64b917..7b1fa8c630 100644
--- a/lib/rdoc/markup/to_test.rb
+++ b/lib/rdoc/markup/to_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# This Markup outputter is used for testing purposes.