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-rw-r--r--ext/tk/lib/tk/namespace.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/namespace.rb b/ext/tk/lib/tk/namespace.rb
index 0119ba5ef7..1cab6fa060 100644
--- a/ext/tk/lib/tk/namespace.rb
+++ b/ext/tk/lib/tk/namespace.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/namespace.rb : methods to manipulate Tcl/Tk namespace
# by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>