What's wrong with std.variant.Variant?

[Paolo Invernizzi]

On Sunday, 14 June 2020 at 18:04:57 UTC, Paul Backus wrote:
> On Sunday, 14 June 2020 at 17:31:32 UTC, Dukc wrote:
>> [...]
>
> FYI, SumType works with nothrow and @nogc, and can solve all of 
> your other problems with std.variant as well. :)
>
> Duplicate types are not supported out-of-the-box, but can very 
> easily be accomplished using `std.typecons.Typedef`:
>
>     alias InPixels = Typedef!(int[2], int[2].init, "InPixels");
>     alias InMeters = Typedef!(float[2], float[2].init, 
> "InMeters");
>     alias SourceSizes = Typedef!(float[2], float[2].init, 
> "SourceSizes");
>     alias PictureSize = SumType!(InPixels, InMeters, 
> SourceSizes);

+1

We are using sumtype instead of std.variant exactly for that, 
attributes are not working with std.variant, and that's a show 
stopper.

/P