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-rw-r--r--actionmailer/lib/action_mailer/preview.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/preview.rb b/actionmailer/lib/action_mailer/preview.rb
index 4f72eca930..8053bf9eba 100644
--- a/actionmailer/lib/action_mailer/preview.rb
+++ b/actionmailer/lib/action_mailer/preview.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/descendants_tracker"
module ActionMailer