Static Initialization of Struct as UDA

[ag0aep6g via Digitalmars-d-learn]

On 06/14/2017 12:04 AM, jmh530 wrote:
> The code below doesn't compile because "static variable z cannot be read 
> at compile time". However, z is a static variable, so I don't see why it 
> wouldn't be available at compile-time.
> 
> Bug or am I missing something?
> 
> struct Bar
> {
>      int x = 2;
>      int y;
> }
> 
> static Bar z = {y:1};
> 
> void main()
> {
>      @z int d;
>      //@Bar(2, 1) int d; //this compiles, but requires putting x in there
> }

No bug. `static` has no effect on module-level variables. `z` is a 
normal mutable variable, not at all guaranteed to be constant. Make it 
an `enum` or `immutable`.

Note that immutable doesn't guarantee compile-time constancy, either. 
You can only use an `immutable` as a compile-time constant when it's 
statically initialized.