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-rw-r--r--lib/logger.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/logger.rb b/lib/logger.rb
index 77b08fe204..2246673b09 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# logger.rb - simple logging utility
# Copyright (C) 2000-2003, 2005, 2008, 2011 NAKAMURA, Hiroshi <nahi@ruby-lang.org>.
#