std.sumtype?

[Paul Backus]

On Friday, 19 March 2021 at 07:28:19 UTC, drug wrote:
> On 3/18/21 9:42 PM, Oleg B wrote:
>> 
>> but read-only tag (kind, type index) is key feature in chouse 
>> between sumtype and other for me, and I hope it will be added 
>> before next compiler release...
>> 
>
> Totally agree, it is an important feature.

https://github.com/pbackus/sumtype/pull/57
https://github.com/dlang/phobos/pull/7886