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-rw-r--r--ext/tk/sample/demos-jp/plot.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/demos-jp/plot.rb b/ext/tk/sample/demos-jp/plot.rb
index 4147b35399..85970bb5b3 100644
--- a/ext/tk/sample/demos-jp/plot.rb
+++ b/ext/tk/sample/demos-jp/plot.rb
@@ -1,4 +1,5 @@
# -*- coding: utf-8 -*-
+# frozen_string_literal: false
#
# 2-D plot widget demo (called by 'widget')
#