learning-go/ch08/interface_impl3.go

[modernix]

Hi Vladimir,

I ran into this issue while testing out the interface examples.
./interface_impl3.go:83:37: s.area undefined (type interface {} is interface with no methods)

To workaround the issue, I modified the shapeInfo func.

func shapeInfo(s interface{}) string {
if str, ok := s.(shape); ok {
return fmt.Sprintf("Area = %.2f", str.(shape).area())
}
return ""
}

[vladimirvivien]

Thanks for pointing this out @modernix