Too ba null/nil is to stay since no Go 2.
Or maybe they would? Iirc 1.21 had technically a breaking change related to for loops. If it was just possible to have migration tooling. I guess too large of a change.
type Result[T, E any] struct {
Val T
Err E
IsErr bool
}
type Payload string
type ProgError struct {
Prog string
Code int
Reason string
}
func DoStuff(x int) Result[Payload, ProgError] {
if x > 8 {
return Result[Payload, ProgError]{Err: ProgError{Prog: "ls", code: 1, "no directory"}}
}
return Result[Payload, ProgError]{Val: "hello"}
}