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-rw-r--r--ext/tk/lib/tkextlib/vu/bargraph.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/vu/bargraph.rb b/ext/tk/lib/tkextlib/vu/bargraph.rb
index b9fcf925f3..e1d58e9555 100644
--- a/ext/tk/lib/tkextlib/vu/bargraph.rb
+++ b/ext/tk/lib/tkextlib/vu/bargraph.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# ::vu::bargraph widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)