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-rw-r--r--ext/tk/lib/tk/mngfocus.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/mngfocus.rb b/ext/tk/lib/tk/mngfocus.rb
index a05fb94f8e..06b20eb6ab 100644
--- a/ext/tk/lib/tk/mngfocus.rb
+++ b/ext/tk/lib/tk/mngfocus.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/mngfocus.rb : methods for Tcl/Tk standard library 'focus.tcl'
# by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>