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-rw-r--r--lib/net/smtp.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/net/smtp.rb b/lib/net/smtp.rb
index 64e536a12a..d634274c3e 100644
--- a/lib/net/smtp.rb
+++ b/lib/net/smtp.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# = net/smtp.rb
#
# Copyright (c) 1999-2007 Yukihiro Matsumoto.