# File lib/aws/option_grammar.rb, line 538
      def apply_rename_descriptor(m, name, new_name)
        name = ruby_name(name)
        MetaUtils.extend_method(m, :validate) do |opts|
          raise ArgumentError.new("unexpected option foo") if
            opts.key?(name) or opts.key?(name.to_sym)

          opts = opts.dup
          opts[name] = opts[new_name] if opts.key?(new_name)
          opts[name.to_sym] = opts[new_name.to_sym] if opts.key?(new_name.to_sym)
          opts.delete(new_name)
          opts.delete(new_name.to_sym)
          super(opts)
        end

        # couldn't find a better way to alias a class method
        method = m.method("params_for_#{name}")
        MetaUtils.extend_method(m, "params_for_#{new_name}") do |value|
          method.call(value)
        end
      end