double_panic.go

import "fmt"

func f(ch chan int) {
    defer func() {
        fmt.Println("Deferred by f")
    }()
    g()
    ch <- 0
}

func g() {
    defer func() {
        fmt.Println("Deferred by g")
    }()
    h()
}

func h() {
    defer func() {
        fmt.Println("Deferred by h")
    }()
    defer func() {
        panic("2nd explosion!")
    }()
    panic("boom!")
}

func main() {
    ch := make(chan int)
    go f(ch)
    <-ch
}