Golang：隐式 struct 匹配

请考虑以下代码:

type Rectangle struct {
    Width, Height, Area int
}

type Square struct {
    Side, Area int
}

type Geometry struct {
    Area int
}

func SumGeometries(geometries ...Geometry) (sum int) {
    for _, g := range geometries {
        sum += g.Area
    }
    return
}

func TestSumGeometries(t *testing.T) {
    rect := Rectangle{5, 4, 20}
    square := Square{5, 25}

    got := SumGeometries(rect, square)      // cannot use rect (variable of type Rectangle) as Geometry value in argument to MyFunc compilerIncompatibleAssign
    want := 45

    if got != want {
        t.Error("fail!")
    }
}

I want MyFunc to take whatever struct that contains Apple, not just BStruct in specific.
Is this achievable in Go?

我能找到自动取款机的唯一方法是:

type Rectangle struct {
    Width, Height, Area int
}

func (r *Rectangle) GetArea() int {
    return r.Area
}

type Square struct {
    Side, Area int
}

func (s *Square) GetArea() int {
    return s.Area
}

type Areaer interface {
    GetArea() int
}

func SumGeometries(geometries ...Areaer) (sum int) {
    for _, s := range geometries {
        sum += s.GetArea()
    }
    return
}

func TestArgs(t *testing.T) {
    rect := Rectangle{5, 4, 20}
    square := Square{5, 25}

    got := SumGeometries(&rect, &square)        // cannot use rect (variable of type Rectangle) as Geometry value in argument to MyFunc compilerIncompatibleAssign
    want := 45

    if got != want {
        t.Error("fail!")
    }
}

这感觉可能不太惯用:当我已经对消费者直接访问数据感到满意时，我会想用不必要的方法污染我的 struct 吗？