instance method const_missing

# File activesupport/lib/active_support/deprecation/constant_accessor.rb, line 10
          def const_missing(missing_const_name)
            if class_variable_defined?(:@@_deprecated_constants)
              if (replacement = class_variable_get(:@@_deprecated_constants)[missing_const_name.to_s])
                replacement[:deprecator].warn(replacement[:message] || "#{name}::#{missing_const_name} is deprecated! Use #{replacement[:new]} instead.", caller_locations)
                return ActiveSupport::Inflector.constantize(replacement[:new].to_s)
              end
            end
            super
          end