# File lib/active_support/core_ext/string/output_safety.rb, line 5
        def self.included(base)
          base.class_eval do
            alias_method :add_without_safety, :+
            alias_method :+, :add_with_safety
            alias_method_chain :concat, :safety
            undef_method :<<
            alias_method :<<, :concat_with_safety
          end
        end