OK seems i already got the answer https://github.com/golang/go/issues/45346#issuecomment-862505803 https://github.com/golang/go/issues/49054
Pada Minggu, 13 Maret 2022 pukul 00.14.22 UTC+7 Richiise Nugraha menulis: > https://go.dev/play/p/SgTiaeE9J2b?v=gotip > > Pada Sabtu, 12 Maret 2022 pukul 23.57.35 UTC+7 Richiise Nugraha menulis: > >> 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 >> >> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/94045799-c215-4d8d-8d47-d13513a7be01n%40googlegroups.com.
