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-rw-r--r--ext/tk/sample/demos-jp/ttkmenu.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/demos-jp/ttkmenu.rb b/ext/tk/sample/demos-jp/ttkmenu.rb
index aa9db5019f..b521a3f101 100644
--- a/ext/tk/sample/demos-jp/ttkmenu.rb
+++ b/ext/tk/sample/demos-jp/ttkmenu.rb
@@ -1,4 +1,5 @@
# -*- coding: utf-8 -*-
+# frozen_string_literal: false
#
# ttkmenu.rb --
#