variant visit not pure?

[Dukc]

On Thursday, 7 May 2020 at 15:36:36 UTC, Ben Jones wrote:
> I've been using SumType... What are the main differences 
> between it and TaggedAlgebraic?

I have not used the the algebraic type of Taggedalgebraic tbh, 
but it also has a tagged union type that I have good experiences 
with. Unlike Phobos algebraic or SumType, it can have multiple 
fields of same type that are still separate by the tag value. 
Also unlike the two others I mentioned, you can handily define a 
`Void` field (or many of them) if you want special values for the 
tag that don't come with a value. In essence, 
`Taggedalgebraic.TaggedUnion` it's the D equivalent of Rust 
`enum`[1].

1: https://doc.rust-lang.org/book/ch06-00-enums.html