Are static variables available to other static variables?

[XavierAP]

On Friday, 12 April 2019 at 10:56:32 UTC, Jamie wrote:
> On Friday, 12 April 2019 at 10:49:19 UTC, Jamie wrote:
>> I was trying to declare a static variable dependent on another 
>> static variable, but it didn't work. Are static variables not 
>> known to other static variables at compile time?
>>
>> void main()
>> {	
>> 	C c = new C();
>> }
>>
>> class C
>> {
>>     static size_t A = 2;
>>     static size_t B = 2^^A; // A is not known at compile time
>> }
>
> Ok I'm confused... why does that above not work but this does:
>
> void main()
> {	
>     C c = new C();
> }
> class C
> {
>     static size_t A = 2;
>     static size_t B;
>     static this()
>     {
>         B = 2^^A;
>     }
> }

It's not a bug. I finally found it in the spec:

https://dlang.org/spec/class.html#static-constructor

"All member initializations must be determinable by the compiler 
at compile time, hence there is no order-of-evaluation dependency 
for member initializations, and it is not possible to read a 
value that has not been initialized. Dynamic initialization is 
performed by a static constructor"