main.go

package main

import (
	"fmt"
	"log"
	"sync"
)

var (
	wg sync.WaitGroup
)

func main() {
	defer func() {
		log.Print("main(): Running in defer")
		if r := recover(); r != nil {
			log.Printf("main() recovered: %#q (%T)", r, r)
			if err, ok := r.(error); ok {
				log.Printf("main() recovered an error: %#q (%T)", err, err)
				// panic(fmt.Errorf("main(): %#q", err))
			}
		}
		log.Printf("main(): defer after recover()")
	}()
	panicking()
}

func panicking() {
	defer func() {
		log.Print("panicking(): Running in defer")
		if r := recover(); r != nil {
			log.Printf("panicking() recovered: %#q (%T)", r, r)
			if err, ok := r.(error); ok {
				log.Printf("panicking() recovered an error: %#q (%T)", err, err)
				panic(fmt.Errorf("panicking(): %#q", err))
			}
		}
		log.Printf("panicking(): defer after recover()")
	}()

	panic(fmt.Errorf("This is the panic message!"))
}