PS: You might be interested in the discussion about whether or not to allow
this in the future:
https://github.com/golang/go/issues/41716
On Sat, Dec 26, 2020 at 11:20 PM Axel Wagner <axel.wagner...@googlemail.com>
wrote:
> `Union[T, error]` is defined as
>
> interface {
> type T, error
> }
>
> An interface containing a type-list can only be used as a constraint.
> However, you are using it as a type in several places.
>
> On Sat, Dec 26, 2020 at 10:22 PM thwd <sedeveloper...@gmail.com> wrote:
>
>> My (short) code:
>> https://go2goplay.golang.org/p/J4Ovyt-4xXN
>>
>> The spec:
>>
>> https://go.googlesource.com/proposal/+/refs/heads/master/design/go2draft-type-parameters.md
>>
>> The errors:
>> prog.go2:7:30: interface contains type constraints (T, error)
>> prog.go2:19:32: interface contains type constraints (T, struct{})
>> prog.go2:10:13: interface contains type constraints (T, error)
>> prog.go2:15:13: interface contains type constraints (T, error)
>> prog.go2:22:13: interface contains type constraints (T, struct{})
>>
>> What am I doing wrong?
>>
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