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-rw-r--r--ext/tk/sample/tkmultilistbox.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkmultilistbox.rb b/ext/tk/sample/tkmultilistbox.rb
index 7791649c4b..c8c8118ffe 100644
--- a/ext/tk/sample/tkmultilistbox.rb
+++ b/ext/tk/sample/tkmultilistbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkmultilistbox.rb : multiple listbox widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)