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-rw-r--r--ext/tk/sample/tkextlib/treectrl/www-options.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/treectrl/www-options.rb b/ext/tk/sample/tkextlib/treectrl/www-options.rb
index 6a3e9c2201..81f5349abc 100644
--- a/ext/tk/sample/tkextlib/treectrl/www-options.rb
+++ b/ext/tk/sample/tkextlib/treectrl/www-options.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
def demoInternetOptions (t)
@Option = TkVarAccess.new_hash('::Option')