// is set to >= 1.
	const n = 10
	c := make(chan int)
	done := make(chan struct{})

	go func() {
		for i := 0; i < n; i++ {
			c <- i
			// use lots of stack, briefly.
			stackGrowthRecursive(20)
		}
		done <- struct{}{}
	}()

	for i := 0; i < n; i++ {
		x := <-c
		if x != i {
			t.Errorf("bad channel read: want %d, got %d", i, x)
		}

	<-done // Make sure goroutines exit
	<-done
	<-done
}

var padData [128]uint64

func stackGrowthRecursive(i int) {
	var pad [128]uint64
	pad = padData
	for j := range pad {
		if pad[j] != 0 {
			return
		}
	}
	if i != 0 {
		stackGrowthRecursive(i - 1)
	}
}

func TestPreemptSplitBig(t *testing.T) {
	if testing.Short() {
		t.Skip("skipping in -short mode")