Go defer

import "fmt"

func trace(name string) string {
        fmt.Println("Entering ", name)
        return name
}

func un(name string) string {
        fmt.Println("Exiting", name)
        return name
}

func a() {
        defer un(trace("a"))
        fmt.Println("Hello, world")
}

func b(){
        defer un(trace("b"))
        fmt.Println("Before i < 10 loop")
        for i:=0 ; i < 10; i++{
                defer fmt.Println("i =", i)
        }

        fmt.Println("After i < 10 loop")
}

func main(){
        a()
        b()
}

Entering  a
Hello, world
Exiting a
Entering  b
Before i < 10 loop
After i < 10 loop
i = 9
i = 8
i = 7
i = 6
i = 5
i = 4
i = 3
i = 2
i = 1
i = 0
Exiting b