Scala’s type system goes far beyond simple generics.

I'll give an example of the Scala type system: let's define combining 2 integers as adding them together, then combining 2 lists of integers will give a new list where an element is the result of combining of 2 elements in the given 2 lists. Now we can make it a bit more generic: if a type A has a method combine, then 2 lists of elements of type A can be combined together to give a new list of which each element is from combining 2 elements in the 2 given lists.

How do you implement it in Go? It can be done in Java with generics, but if I make the problem a little bit more generic, a little bit more complicated, then I don't think Java can do it.