Comment by randomdata

Then what you are really looking for is sum types (what Rust calls enums, but unusually so), not enums. Go does not have sum types, but you can use interfaces to archive a rough facsimile and most certainly to satisfy your specific expectation:

    type Hot struct{}
    func (Hot) temp() {}

    type Cold struct{}
    func (Cold) temp() {}

    type Temperature interface {
        temp()
    }

    func SetThermostat(temperature Temperature) {
        switch temperature.(type) {
        case Hot:
            fmt.Println("Hot")
        case Cold:
            fmt.Println("Cold")
        }
    }