“错误”；额外代币“；学校"；在表达结束后；在Julia中使用Immutable时

有人能帮我更正下面的代码吗

immutable School
    subject::Symbol
    nclasses::Intn
    students::Int  # average no. of students per class
end

我正在犯错误

syntax: extra token "School" after end of expression

---

immutable

不再是关键字，请使用与之等效的

struct

。如果需要可变对象，请使用

mutable struct

。以下是一些例子：

struct School_immutable
    subject::Symbol
    nclasses::Int
    students::Int  # average no. of students per class
end

mutable struct School_mutable
    subject::Symbol
    nclasses::Int
    students::Int  # average no. of students per class
end

有关概念的详细信息和关键字参数的文档，请参见