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-rw-r--r--ext/tk/sample/tkextlib/treectrl/outlook-newgroup.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/treectrl/outlook-newgroup.rb b/ext/tk/sample/tkextlib/treectrl/outlook-newgroup.rb
index 3495522e5c..841f330919 100644
--- a/ext/tk/sample/tkextlib/treectrl/outlook-newgroup.rb
+++ b/ext/tk/sample/tkextlib/treectrl/outlook-newgroup.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# Demo: Outlook Express newsgroup messages
#