Best practice for unions in Go

Question

Go has no unions. But unions are necessary in many places. XML makes excessive use of unions or choice types. I tried to find out, which is the preferred way to work around

Answer 1

I think this amount of code might be reduced, e.g. I personally do not think that safeguarding type Misc against containing "illegal" stuff is really helpful: A simple type Misc interface{} would do, or?

With that you spare the constructors and all the Is{Comment,ProcessingInstruction,WhiteSpace} methods boil down to a type switch

switch m := misc.(type) {
    Comment: fmt.Println(m)
    ... 
    default: panic()
}

Thats what package encoding/xml does with Token.