`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 <[email protected]> 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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