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-rw-r--r--ext/tk/lib/tk/textwindow.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/textwindow.rb b/ext/tk/lib/tk/textwindow.rb
index 49327b2c81..e0be5bac7a 100644
--- a/ext/tk/lib/tk/textwindow.rb
+++ b/ext/tk/lib/tk/textwindow.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/textwindow.rb - treat Tk text window object
#