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-rw-r--r--railties/lib/rails/mailers_controller.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/railties/lib/rails/mailers_controller.rb b/railties/lib/rails/mailers_controller.rb
index 5b9af97617..6bd3161fdd 100644
--- a/railties/lib/rails/mailers_controller.rb
+++ b/railties/lib/rails/mailers_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require_relative "application_controller"
class Rails::MailersController < Rails::ApplicationController # :nodoc: