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-rw-r--r--ext/tk/sample/tkextlib/tcllib/datefield.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/tcllib/datefield.rb b/ext/tk/sample/tkextlib/tcllib/datefield.rb
index 3550af7d23..cf77ed5e64 100644
--- a/ext/tk/sample/tkextlib/tcllib/datefield.rb
+++ b/ext/tk/sample/tkextlib/tcllib/datefield.rb
@@ -1,4 +1,5 @@
#!/usr/bin/ruby
+# frozen_string_literal: false
require 'tk'
require 'tkextlib/tcllib/datefield'