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-rw-r--r--ext/tk/sample/demos-jp/knightstour.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/demos-jp/knightstour.rb b/ext/tk/sample/demos-jp/knightstour.rb
index 835a24c392..f4de10b3b3 100644
--- a/ext/tk/sample/demos-jp/knightstour.rb
+++ b/ext/tk/sample/demos-jp/knightstour.rb
@@ -1,4 +1,5 @@
# -*- coding: utf-8 -*-
+# frozen_string_literal: false
#
# Based on the widget demo of Tcl/Tk8.5.2
# The following is the original copyright text.