新手问一个 go 实现并发素数筛的问题

• https://go.dev/play/p/CJSIHL3ycKG

func Filter(in <-chan int, out chan<- int, prime int) {
	for {
		i := <-in
		if i%prime != 0 {
			out <- i
		}
	}
}

func Generate(ch chan<- int) {
	for i := 2; ; i++ {
		ch <- i
	}
}

func main() {
	ch := make(chan int)
	go Generate(ch)
	// print the first 10 prime numbers
	for i := 0; i < 10; i++ {
		prime := <-ch
		println("next prime = ", prime)
		ch1 := make(chan int)
		go Filter(ch, ch1, prime)
		ch = ch1
	}
}

• https://go.dev/play/p/q0NdUVMjArc

func Filter(in <-chan int, out chan<- int, prime int) {
	for {
		i := <-in
		if i%prime != 0 {
			out <- i
		}
	}
}

func main() {
	ch := make(chan int)
	go func() {
		for i := 2; ; i++ {
			ch <- i
		}
	}()

	for i := 0; i < 10; i++ {
		prime := <-ch
		println("next prime = ", prime)
		ch1 := make(chan int)
		go Filter(ch, ch1, prime)
		ch = ch1
	}
}

运行后发现上面的代码可以实现并发素数筛的功能, 但是下面的闭包写法就不行, 有没有大佬解释一下?