awscli/argprocess.py [380:388]:
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        model = cli_argument.argument_model
        if (
            model.type_name == 'list'
            and model.member.type_name == 'structure'
            and len(model.member.members) == 1
            and self._uses_old_list_case(
                service_id, operation_name, cli_argument.name
            )
        ):
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awscli/argprocess.py [487:495]:
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        model = cli_argument.argument_model
        if (
            model.type_name == 'list'
            and model.member.type_name == 'structure'
            and len(model.member.members) == 1
            and self._uses_old_list_case(
                service_id, operation_name, cli_argument.name
            )
        ):
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -