# File lib/aws/option_grammar.rb, line 203
          def validate(value, context = nil)
            raise format_error("enumerable value", context) unless
              value.respond_to? :each
            i = 0
            value.each do |member|
              i += 1
              member_option.validate(member,
                                     "member #{i} of #{context_description(context)}")
            end
          end