Is Go type parameter supports interface union?
My case
type MessageSpec interface { MessageA | MessageB }
type MessageA interface { ID() uint64 }
type MessageB interface { Uid() uint64 }
but got compile error:
./prog.go:14:2: cannot use main.MessageA in union (main.MessageA contains
methods) ./prog.go:14:13: cannot use main.MessageB in union (main.MessageB
contains methods)
I tried to look for documentation and readed
https://go.googlesource.com/proposal/+/refs/heads/master/design/43651-type-parameters.md#interface-types-in-union-elements
There's example
> type Stringish interface { string | fmt.Stringer }
but it also throwing error
> ./prog.go:19:11: cannot use fmt.Stringer in union (fmt.Stringer contains
methods)
Is this a bug? i know my case is not the same thing as like the one i
referenced from the proposal
but it is throwing the same error.
Thanks
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