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-rw-r--r--lib/monitor.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/monitor.rb b/lib/monitor.rb
index e0491ec054..73741f8ddb 100644
--- a/lib/monitor.rb
+++ b/lib/monitor.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# = monitor.rb
#
# Copyright (C) 2001 Shugo Maeda <shugo@ruby-lang.org>