go panic时如何让函数返回数据?

package main 
import "fmt" 
func test() int {
 defer func() {
 if err := recover(); err != nil {
  return 1
 }
 }()
 var p *int
 *p = 0
 return 0
}
func main() {
 fmt.Println("ret is", test())
 for {}
}

package main 
import "fmt" 
func test() (a int) {
 defer func() {
 if err := recover(); err != nil {
  a = 1
 }
 }()
 var p *int
 *p = 0
 return 0
}
func main() {
 fmt.Println("ret is", test())
 for {}
}