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-rw-r--r--ext/tk/sample/demos-en/check.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/demos-en/check.rb b/ext/tk/sample/demos-en/check.rb
index bf0b73476a..3f3b07bd0a 100644
--- a/ext/tk/sample/demos-en/check.rb
+++ b/ext/tk/sample/demos-en/check.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# check.rb
#
# This demonstration script creates a toplevel window containing