Can now use alias for collapsing multiple fields in nested structs

[Walter Bright]

On 12/30/2024 9:09 AM, Derek Fawcus wrote:
> Whereas this new D enhancement seems to be somewhat different, as in D it seems 
> the structs always need to have tags.

Not exactly.

Anonymous structs in D are used to simplify layout, as in:
```
struct S
{
     int a;
     union
     {
         struct { int j, k; }
	double d;
     }
}
...
S.a
S.j
S.k
S.d
```
No extra tags needed.

and:

```
struct S
{
     struct { int a, b; }
}
...
S.a
S.b
```
The anonymous struct there is pointless.


> Not that I'm arguing against such an enhancement; simply that the C limitation, 
> and preprocesser games being used as a partial justification is long obsolete.

The C11 thing is just copying what D did.