var floatSwap func(float64, float64) (float64, float64)
	makeSwap(&floatSwap)
	fmt.Println(floatSwap(2.72, 3.14))

	// Output:
	// 1 0
	// 3.14 2.72
}

func ExampleStructTag() {
	type S struct {
		F string `species:"gopher" color:"blue"`
	}

	s := S{}
	st := reflect.TypeOf(s)
	field := st.Field(0)
	fmt.Println(field.Tag.Get("color"), field.Tag.Get("species"))

	// Output: