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-rw-r--r--ext/tk/sample/tkextlib/bwidget/dnd.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/bwidget/dnd.rb b/ext/tk/sample/tkextlib/bwidget/dnd.rb
index b1b1cf60ff..326288bade 100644
--- a/ext/tk/sample/tkextlib/bwidget/dnd.rb
+++ b/ext/tk/sample/tkextlib/bwidget/dnd.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# dnd demo --- called from demo.rb
#