D does have head const (but maybe it shouldn't)

[Max Haughton]

On Tuesday, 29 December 2020 at 20:47:10 UTC, John Colvin wrote:
> On Tuesday, 29 December 2020 at 19:42:28 UTC, John Colvin wrote:
>> [...]
>
> It's so head-const that I made the beginnings of a friendly 
> 100% @safe head-const with it. Please don't use it.
>
> [...]

Isn't there already Final in experimental typecons?

I think with any method like this you are slightly at the mercy 
of the ABI for structs but I haven't been bitten yet.