alias_method_chain

# File activesupport/lib/active_support/core_ext/module/aliasing.rb, line 25
      def alias_method_chain(target, feature)
        # Strip out punctuation on predicates or bang methods since
        # e.g. target?_without_feature is not a valid method name.
        aliased_target, punctuation = target.to_s.sub(/([?!=])$/, ''), $1
        yield(aliased_target, punctuation) if block_given?

        with_method, without_method = "#{aliased_target}_with_#{feature}#{punctuation}", "#{aliased_target}_without_#{feature}#{punctuation}"

        alias_method without_method, target
        alias_method target, with_method

        case
          when public_method_defined?(without_method)
            public target
          when protected_method_defined?(without_method)
            protected target
          when private_method_defined?(without_method)
            private target
        end
      end