module: Main
	import: os
    struct: Address
        fields:
            declare country: int
            declare city: int
        init:
            params:
                country: int
                city: int
            body:
                this.country = country
                this.city = city
            end body
        end init

        function: getCity
            returns: int
            body:
                return this.city
            end body
        end function
    end struct

    struct: Person
        fields:
            declare name: int
            declare addr: Address
        init:
            params:
                name: int
                addr: Address
            body:
                this.name = name
                this.addr = addr
            end body
        end init

        function: getName
            returns: int
            body:
                return this.name
            end body
        end function

        function: getAddr
            returns: Address
            body:
                return this.addr
            end body
        end function
    end struct

    function: main
        returns: void
        body:
            // 初始化 Person 和 Address 的实例
            declare p: Person = new Person(123, new Address(1, 2))
            os.println(p.getName())             // 打印 name
            os.println(p.getAddr().getCity())   // 打印 city

        end body
    end function

end module