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-rw-r--r--ext/tk/sample/menubar2.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/menubar2.rb b/ext/tk/sample/menubar2.rb
index e3cd68eaef..5930d2745f 100644
--- a/ext/tk/sample/menubar2.rb
+++ b/ext/tk/sample/menubar2.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# menubar sample 2 : use 'menu' option of root/toplevel widget
#