To be fair, the Rust approach is mostly the same as the Go one on the machine, just harder to screw-up: the discriminant of the enum has to be checked to be abl

To be fair, the Rust approach is mostly the same as the Go one on the machine, just harder to screw-up: the discriminant of the enum has to be checked to be able to extract the value (or extract the error) which is similar to checking `err` for `nil`.