我需要在defer函数中编写一些业务逻辑。defer中的控制流应该基于defer是在系统死机之后执行还是在函数成功执行之后执行。

package main
import "log"
func b() {
    panic("panicked in b")
}
func a() {
    b()
}
func main() {
    defer func() {
     // If panicked 
         log.Println("panicked")
         // if called after function successfully executed
         log.Println("Success")
         /* 
            How to understand if defer is triggered by panic or after function returned successfully.
         */
    }()
    a()
    log.Println("main code")
}

预期：Defer应该能够通过任何可能的方式知道它被panic调用