'How does 'type DoNotCompare [0]func()' prevent comparability in Golang

Per protobuf pragma

`type DoNotCompare [0]func()`
DoNotCompare can be embedded in a struct to prevent comparability

I am confused why DoNotCompare could prevent comparability, and try to understand with the following codes. Unfortunately, I am failed. The NonCompare struct seems could be comparability.

type DoNotCompare [0]func()

type NonCompare struct {
    DoNotCompare

    ii int8
}

type Comparer interface {
    Compare(b NonCompare) int
}

func (a NonCompare) Compare(b NonCompare) int {
    if a.ii > b.ii {
        return 1
    }
    return 0
}

func main() {
    var nc1 = NonCompare{ii: 3}
    var nc2 = NonCompare{ii: 5}

    nc1.Compare(nc2)

Is there anything am I missing?

gostructcomparison-operators


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