main.go

package main

import (
	"fmt"
	"time"
)

func HandlerCreator() func() {
	timer := func() func() {
		fmt.Println("Initiating timer")
		t := time.Now()
		return func() {
			fmt.Printf("Time spent is: %v\n", time.Now().Sub(t))
		}
	}

	return func() {
		defer timer()()
		fmt.Println("Handling stuff")
		time.Sleep(2 * time.Second)
	}
}

func main() {
	handler := HandlerCreator()
	handler()
}