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-rw-r--r--ext/tk/sample/tkextlib/treectrl/outlook-folders.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/sample/tkextlib/treectrl/outlook-folders.rb b/ext/tk/sample/tkextlib/treectrl/outlook-folders.rb
index d966807866..8707251ee9 100644
--- a/ext/tk/sample/tkextlib/treectrl/outlook-folders.rb
+++ b/ext/tk/sample/tkextlib/treectrl/outlook-folders.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# Demo: Outlook Express folder list
#