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-rw-r--r--actionmailer/lib/action_mailer.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer.rb b/actionmailer/lib/action_mailer.rb
index 8e59f033d0..16dfe53e18 100644
--- a/actionmailer/lib/action_mailer.rb
+++ b/actionmailer/lib/action_mailer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
#--
# Copyright (c) 2004-2017 David Heinemeier Hansson
#