有哪位高手帮我看看这段代码有什么问题

package main

import "fmt"
import "sync"

func main(){
    var wg sync.WaitGroup
    wg.Add(1)
    f(wg)
    wg.Wait()
    fmt.Println("exit from main")
}

func f(wg sync.WaitGroup){
    defer func(){
        if e := recover(); e != nil {
            fmt.Println("caught panic")
        }
        wg.Done()
    }()
    go func(){
        defer func(){
            if e := recover(); e != nil {
                fmt.Println(e)
            }
        }()
        panic(1)
    }()
}

执行结果：

1
fatal error: all goroutines are asleep - deadlock!

goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc42000e23c)
    /home/zenglin/Downloads/go1.8/src/runtime/sema.go:47 +0x34
sync.(*WaitGroup).Wait(0xc42000e230)
    /home/zenglin/Downloads/go1.8/src/sync/waitgroup.go:131 +0x7a
main.main()
    /mnt/hgfs/src/test/test.go:10 +0x6c
exit status 2

怎么会所有的协程都阻塞？