I think adding generics to a stable language is actually a hard thing to do. There's more than "that's it". Rust has had many major and minor changes regarding

I think adding generics to a stable language is actually a hard thing to do. There's more than "that's it". Rust has had many major and minor changes regarding generics solely, which has broken backward compatibility each time. The Go team may find a brilliant way to accomplish this, but I think the only viable way left is, as you said, using code generation. Either C++-way, which is a special syntax but still a form of code generation, or an external tool. But neither of them is elegant, because you cannot fully utilize the convenience that the type system give. These might be the concerns that the Go team has.