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1.2.2 不发送数据的信道

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Original file line number	Diff line number	Diff line change
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	`1`	`+package datastructure`
	`2`	`+`
	`3`	`+import (`
	`4`	`+ "fmt"`
	`5`	`+ "testing"`
	`6`	`+)`
	`7`	`+`
	`8`	`+func worker(ch chan struct{}) {`
	`9`	`+ <-ch`
	`10`	`+ fmt.Println("do something")`
	`11`	`+}`
	`12`	`+`
	`13`	`+func TestChannelWithoutData(t *testing.T) {`
	`14`	`+ ch := make(chan struct{})`
	`15`	`+ go worker(ch)`
	`16`	`+ ch <- struct{}{}`
	`17`	`+ close(ch)`
	`18`	`+}`

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