More Intuitive Syntax for Manifest (enum) Constants

[Paul Backus]

On Friday, 21 November 2025 at 11:20:08 UTC, Per Nordlöw wrote:
> As D already has the keyword `macro` reserved, it just struck 
> me that I personally think
>
> ```d
> macro N = 42;
> ```
>
> is more intuitive and recognizable than
>
> ```d
> enum N = 42;
> ```

By the way, we do not necessarily have to use a keyword for this. 
The D grammar allows declarations with only a UDA to the left of 
the variable name, rather than a type or storage class:

```d
@UDA N = 42;
```

So if we created a new `core.attribute` UDA, we could potentially 
write code like this:

```d
@manifestConstant N = 42;
```