> Short version to just get a taste:
>
> type Time struct {
> Err error
> *time.Time
> }
>
> func now(pass bool) Time {
> if !pass {
> return Time{Err: errors.New("not now")}
> }
> now := time.Now()
> return Time{Time: &now}
> }
>
> t := now(…)
> f t.Err != nil {
> return t.Err
> }
>
>
Problem is that it continues to be product type, nothing really enforces
that you can't use t as a time.Time when t.Err is set.
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