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-rw-r--r--ext/tk/sample/demos-en/unicodeout.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/demos-en/unicodeout.rb b/ext/tk/sample/demos-en/unicodeout.rb
index ee7b5afa15..910dff38b7 100644
--- a/ext/tk/sample/demos-en/unicodeout.rb
+++ b/ext/tk/sample/demos-en/unicodeout.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# unicodeout.rb --
#
# This demonstration script shows how you can produce output (in label