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-rw-r--r--ext/tk/lib/tkclass.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkclass.rb b/ext/tk/lib/tkclass.rb
index 87f5acc453..947cbf3a4a 100644
--- a/ext/tk/lib/tkclass.rb
+++ b/ext/tk/lib/tkclass.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkclass.rb - Tk classes
# Date: 2000/11/27 09:23:36