↳ In-reply-to » Question to all you Gophers out there: How do you deal with custom errors that include more information and different kinds of matching them?

@lyse@lyse.isobeef.org do you need to have an explicit Is function? I believe errors.Is has reflect lite and can do the type infer for you. The Is is only really needed if you have a dynamic type. Or are matching a set of types as a single error maybe? The only required one would be Unwrap if your error contained some other base type so that Is/As can reach them in the stack.

As is perfect for your array type because it asserts the matching type out the wrap stack and populates the type for evaluating its contents.