func TestRaceChanItselfClose(t *testing.T) {
	compl := make(chan bool, 1)
	c := make(chan int)
	go func() {
		close(c)
		compl <- true
	}()
	c = make(chan int)
	<-compl
}

func TestRaceChanItselfLen(t *testing.T) {
	compl := make(chan bool, 1)
	c := make(chan int)
	go func() {
		_ = len(c)
		compl <- true
	}()
	c = make(chan int)
	<-compl
}