Comment by nukifw

Yes and my point was, when you want what you present in the first comment, quoting my post, you have tools for that, available in OCaml. But there is cases, when you do not want to treat each branch of your constructors "as a type", when the encoding of visitors is just rough. This is why I think it is nice to have sum type, to complete product type. So i am not sure why we are arguing :)