third draft: add bitfields to D

[Dom DiSc]

On Wednesday, 3 July 2024 at 19:02:59 UTC, Dave P. wrote:
> Wouldn’t a more D-like syntax be to have the number of bits 
> following the type instead of following the variable name? This 
> would be more consistent with how D arrays are different than C 
> arrays.
>
> ```D
> struct Foo {
>     uint:4 x;
>     uint:5 y;
> }
> ```

I like this. As for arrays it's much more readable than the C 
syntax.