Can now use alias for collapsing multiple fields in nested structs

[Walter Bright]

On 12/28/2024 5:23 PM, Derek Fawcus wrote:
> It was... That particular preprocessor game largely became unnecessary once we 
> gained C11 anonymous structs and unions.

D had anonymous structs and unions long before C11.

BTW, I did find an appropriate use for it in the backend, unfortunately I can't 
use it because the bootstrap compiler is old old old.