func test_1(){

exit:=make(chan struct{})
go func() {
    defer close(exit)
    defer println("exit")
    func(){
        defer func() {
            println("b:",recover()==nil,recover())
        }()
        func (){
            println("c")
            //runtime.Goexit()
            panic("panic done")
            println("c done")

        }()
        println("b done")
    }()
    println("a done")
}()
<-exit

}

調(diào)用panic后會結(jié)束后續(xù)的流程，defer可以繼續(xù)執(zhí)行，但是println("a done")還是輸出了了結(jié)果，照理來說panic調(diào)用后這部分應(yīng)該也不能輸出的為啥能輸出“a done”?