std.sumtype nested SumTypes

[Paul Backus]

On Monday, 22 January 2024 at 21:11:17 UTC, NonNull wrote:
>
> I'd like SumType to combine the implicit tags so there's only 
> one tag.

SumType does not do this automatically (because sometimes you 
might want to keep the inner SumTypes separate), but you can do 
it yourself like this:

     alias A = SumType!(X, Y);
     alias B = SumType!(Z, W);
     alias C = SumType!(A.Types, B.Types);