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-rw-r--r--ext/tk/sample/tkextlib/tktable/buttons.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/tktable/buttons.rb b/ext/tk/sample/tkextlib/tktable/buttons.rb
index e35c137a28..2c3fee7982 100644
--- a/ext/tk/sample/tkextlib/tktable/buttons.rb
+++ b/ext/tk/sample/tkextlib/tktable/buttons.rb
@@ -1,4 +1,5 @@
#!/usr/bin/env ruby
+# frozen_string_literal: false
##
## buttons.rb
##