}

func TestWaitGroupAlign(t *testing.T) {
	type X struct {
		x  byte
		wg WaitGroup
	}
	var x X
	x.wg.Add(1)
	go func(x *X) {
		x.wg.Done()
	}(&x)
	x.wg.Wait()
}

func BenchmarkWaitGroupUncontended(b *testing.B) {
	type PaddedWaitGroup struct {
		WaitGroup
		pad [128]uint8
	}
	b.RunParallel(func(pb *testing.PB) {
		var wg PaddedWaitGroup
		for pb.Next() {
			wg.Add(1)
			wg.Done()