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-rw-r--r--ext/tk/sample/tkextlib/iwidgets/sample/selectionbox.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/iwidgets/sample/selectionbox.rb b/ext/tk/sample/tkextlib/iwidgets/sample/selectionbox.rb
index 74684974b1..8c0b68a22e 100644
--- a/ext/tk/sample/tkextlib/iwidgets/sample/selectionbox.rb
+++ b/ext/tk/sample/tkextlib/iwidgets/sample/selectionbox.rb
@@ -1,4 +1,5 @@
#!/usr/bin/env ruby
+# frozen_string_literal: false
require 'tk'
require 'tkextlib/iwidgets'