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-rw-r--r--ext/tk/sample/demos-en/form.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/demos-en/form.rb b/ext/tk/sample/demos-en/form.rb
index abb3e0e10e..b6c6655083 100644
--- a/ext/tk/sample/demos-en/form.rb
+++ b/ext/tk/sample/demos-en/form.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# form widget demo (called by 'widget')
#