僅僅輸出了第一行，第二行就報(bào)錯(cuò)
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [semacquire]:
sync.runtime_Semacquire(0x5852f8)
?? ?D:/Go/src/runtime/sema.go:56 +0x40
sync.(*WaitGroup).Wait(0x5852f0)
?? ?D:/Go/src/sync/waitgroup.go:130 +0x6b
main.main()
2019-07-10
因?yàn)閜arse沒(méi)有循環(huán)接收，第二次的rc和wc就斷開(kāi)了，parse線程死掉