Is the public read-only field with immutable structure valid- Does using public readonly fields for immutable structs work?

problem ：

Is this a proper way to declare immutable structs? Is this the right way to declare immutable structures ？

public struct Pair{    public readonly int x;    public readonly int y;    // Constructor and stuff}

I can't think of why this would run into problems, but I just wanted to ask to make sure. I can't think of why this is a problem , But I just want to ask .

In this example, I used ints. In this case , I use the int.What if I used a class instead, but that class is also immutable, like so? If I use a class , But this class is also immutable , Like this ？That should work fine too, right? This should also work properly , Right ？

public struct Pair{    public readonly (immutableClass) x;    public readonly (immutableClass) y;    // Constructor and stuff}

(Aside: I understand that using Properties is more generalizable and allows changing, but this struct is intended literally to just store two values. I'm just interested in the immutability question here.)（ Aside ： I understand that using attributes is more general and allows changes , But this structure actually only stores two values . I'm just interested in the invariance problem here .）

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Solution ：

Reference resources ： https://stackoom.com/en/question/PRJk