执行结果：
In f
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/test1.go:10 +0x80 exit status 2
有疑问加站长微信联系（非本文作者）
