betterC shared static ctor

[Steven Schveighoffer]

On 7/21/21 4:02 AM, vit wrote:
> Is it possible to call all shared static ctors in betterC?
> ```d
> //-betterC
> 
> static immutable int i;
> 
> shared static this(){
>      i = 42;
> }
> extern(C) void main(){
>      assert(i != 42);
> 
> }
> 
> ```

You can use [C runtime 
constructors](https://dlang.org/spec/pragma.html#crtctor). However, the 
compiler doesn't recognize this as a static ctor exactly, so `i` will 
not be mutable without casting.

```d
immutable int i;
extern(C):
pragma(crt_constructor) void crt_this() {
     *cast(int *)&i = 42;
}

void main() {
     assert(i == 42);
}
```

-Steve