That only works well if each "variant" holds the same kind of thing. If not, you...

		Manishearth on Nov 10, 2016 \| parent \| context \| favorite \| on: Seven years of Go That only works well if each "variant" holds the same kind of thing. If not, you have to store them one after the other (space wastage), or use interfaces to store them in the same place (tag isn't necessary anymore, extra boxing). Rust enums (ADTs) aren't like Java enums where each variant contains the same kind of data.

I understand. I don't mind wasting a few bytes of stack for zero allocs.