import "fmt"

func testDefer(){
    defer fmt.Println(1)
    defer fmt.Println(2)
    fmt.Println(3)
    panic("0")
}

func main()  {
    testDefer()
}

3
2
1
panic: 0

func test(){
    res,err := test2()
    if err != nil {
        fmt.Println("错误信息：",err)
        return
    }

}