for pb.Next() {
				if m.CompareAndSwap(0, 0, 42) {
					m.CompareAndSwap(0, 42, 0)
				}
			}
		},
	})
}

func BenchmarkCompareAndSwapNoExistingKey(b *testing.B) {
	benchMap(b, bench{
		perG: func(b *testing.B, pb *testing.PB, i int, m mapInterface) {
			for ; pb.Next(); i++ {
				if m.CompareAndSwap(i, 0, 0) {
					m.Delete(i)
				}
			}