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-rw-r--r--ext/tk/sample/demos-en/combo.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/demos-en/combo.rb b/ext/tk/sample/demos-en/combo.rb
index d77660095c..2f2dd5d6e5 100644
--- a/ext/tk/sample/demos-en/combo.rb
+++ b/ext/tk/sample/demos-en/combo.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# combo.rb --
#
# This demonstration script creates several combobox widgets.