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-rw-r--r--activesupport/lib/active_support/core_ext/string/output_safety.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index 607870237b..4bfc582eb5 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "erb"
require_relative "../kernel/singleton_class"
require_relative "../../multibyte/unicode"