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-rw-r--r--ext/tk/lib/multi-tk.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/multi-tk.rb b/ext/tk/lib/multi-tk.rb
index e0f41d0f6a..a5759c70cc 100644
--- a/ext/tk/lib/multi-tk.rb
+++ b/ext/tk/lib/multi-tk.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# multi-tk.rb - supports multi Tk interpreters
# by Hidetoshi NAGAI <nagai@ai.kyutech.ac.jp>