运行：
```go
package main
import "fmt"
type Point struct {
X, Y float64
}
func (p *Point) Describe() {
fmt.Printf("(%v, %v)\n", p.X, p.Y)
}
func main() {
(&Point{1, 2}).Describe()
Point{1, 2}.Describe()
}
```
报 2 个编译错误，都是由 `Point{1, 2}.Describe()` 引起的：
```
./prog.go:15:13: cannot call pointer method on Point literal
./prog.go:15:13: cannot take the address of Point literal
```
“cannot take the address of Point literal” 很奇怪，上一行中 `&Point{1,2}` 明明取址了，而且也没报错。Spec 中也说了可以取址。这句该怎么理解？是不是为了强行解释“cannot call pointer method on Point literal”?
---
https://play.golang.org/p/GRQM-EzMSrz
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