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-rw-r--r--actionmailer/lib/action_mailer/collector.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/collector.rb b/actionmailer/lib/action_mailer/collector.rb
index d97a73d65a..c17715bac2 100644
--- a/actionmailer/lib/action_mailer/collector.rb
+++ b/actionmailer/lib/action_mailer/collector.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "abstract_controller/collector"
require "active_support/core_ext/hash/reverse_merge"
require "active_support/core_ext/array/extract_options"