Request assistance initializing struct instance at global scope

[user1234]

On Monday, 7 December 2020 at 04:13:16 UTC, Andrew Edwards wrote:
> Given:
>
> ===============
> extern(C):
> char*[] hldr;
> enum I = (1<<0);
> struct S { char* ft; char** fm; int f; }
>
> void main(){}
> ===============
>
> How do I initialize an instance of S at global scope?

You cant. At the global scope the initializers must be runnable 
at compile time, i.e using CTFE. I've tried to simplify what 
would be required:

---
extern(C):
char*[] hldr;
enum I = (1<<0);
struct S { char* ft; char** fm; int f; }

void main(){}

enum char[8] FirstLevel  = ['0'];
enum         DoubleLevel = &FirstLevel[0]; // here

S[] s = [
     S(
         FirstLevel.ptr,
         DoubleLevel,          // error is here actually, 
interesting
         0),
];
---

D is not able of that :

/tmp/temp_7F835402B0F0.d:9:28: Error: cannot use non-constant 
CTFE pointer in an initializer `&['0', '\xff', '\xff', '\xff', 
'\xff', '\xff', '\xff', '\xff'][0]`