I agree. constraint is different from normal interface. It's better to use
type SomeConstraint constraint {} than type SomeConstraint interface {}
On Wednesday, June 17, 2020 at 11:12:24 AM UTC+8 Brandon Dyck wrote:
> I find it a little strange that an interface with a type list can only be
> used as a constraint, and not as the type of a variable or parameter,
> despite it using basically the same syntax as a normal interface. Is this
> difference between constraints and other interfaces a property of the type
> system, or just a limitation of the translation? I don't think it was
> explicit in the design document. It would certainly be useful to declare
> variables with type-list interfaces, as it would provide a much less hacky
> way to define sum types than using an unexported interface method as in
> https://medium.com/@haya14busa/sum-union-variant-type-in-go-and-static-check-tool-of-switch-case-handling-3bfc61618b1e
> .
>
> My failing example is at https://go2goplay.golang.org/p/-lQ0jKs8_hU.
>
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