[go2go] "interface contains type constraints"

[thwd]

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?

[Axel Wagner]

`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.

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[Axel Wagner]

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