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-rw-r--r--ext/tk/lib/tk/text.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/text.rb b/ext/tk/lib/tk/text.rb
index c18b3843b4..fc4f112933 100644
--- a/ext/tk/lib/tk/text.rb
+++ b/ext/tk/lib/tk/text.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/text.rb - Tk text classes
# by Yukihiro Matsumoto <matz@caelum.co.jp>