[nem-en] Const vs. Static non-mutable

[vc]

> class A {
>   static y : int = 1; // const
>   static volatile y : int = 1; // static readonly
>   static mutable y : int; // static mutable
>   static mutable volatile y : int; // static mutable volatile
> }
> 
> ?

It's not instinctively.