module: Main
    import: os

    // 父类 Person
    struct: Person
        fields:
            declare name: int
        init:
            params:
                name: int
            body:
                this.name = name
            end body
        end init

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

    // 子类 Student 继承 Person
    struct: Student extends Person
        fields:
            declare studentId: int
        init:
            params:
                name: int
                studentId: int
            body:
                super(name)               // 调用父类构造函数
                this.studentId = studentId
            end body
        end init

        function: getStudentId
            returns: int
            body:
                return this.studentId
            end body
        end function
    end struct

    function: main
        returns: void
        body:
            declare s: Student = new Student(123, 1001)

            // Student 拥有父类方法
            os.println(s.getName())      // 来自 Person → 123
            os.println(s.getStudentId()) // 来自 Student → 1001
        end body
    end function
end module