Chiming in as a fervent Go dev that's also a huge fan of generics: Generics are awesome, but always seem to add a ton of complexity. Everyone starts with just "oh, `func Reverse(slice []T)` is so obvious" kind of thing, but that's like saying `fmt.Println("Hello World")` is simple. It's simple cause you are doing a simple thing.

That said, I do want generics to come to Go, just... with an emphasis on what Go is, not just "here, let's replicate X's generics in Go". I am interested in the contracts implementation.