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-rw-r--r--ext/tk/lib/tkextlib/ICONS/icons.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/ICONS/icons.rb b/ext/tk/lib/tkextlib/ICONS/icons.rb
index bd3180aa55..2934757b6d 100644
--- a/ext/tk/lib/tkextlib/ICONS/icons.rb
+++ b/ext/tk/lib/tkextlib/ICONS/icons.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/ICONS/icons.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)