# File lib/aws/core/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