time.Sleep(1 * time.Millisecond)
		}
	}

	runtime.GC()

	runtime.ReadMemStats(&stats2)

	if int(stats2.HeapObjects)-int(stats1.HeapObjects) > 20 { // normally at most 1 or 2; was 300 with leak
		print("BUG: object leak: ", stats.HeapObjects, " -> ", stats1.HeapObjects, " -> ", stats2.HeapObjects, "\n")
	}

	preHeapObjects := stats.HeapObjects

	for i := 0; i < num; i++ {
		withNoEscape()
	}

	runtime.ReadMemStats(&stats)
	nowHeapObjects := stats.HeapObjects

	if nowHeapObjects-preHeapObjects >= num {
		fmt.Printf("too many heap objects allocated, pre: %v, now: %v\n", preHeapObjects, nowHeapObjects)
	}

	runtime.ReadMemStats(&stats)
	preHeapObjects = stats.HeapObjects

	for i := 0; i < num; i++ {

		if i%100 == 0 {
			for j := 0; j < 4; j++ {
				runtime.GC()
				runtime.Gosched()
				runtime.GC()
				runtime.Gosched()
			}
		}
	}

	runtime.ReadMemStats(memstats)
	obj := int64(memstats.HeapObjects - st.HeapObjects)
	if obj > N/5 {
		fmt.Println("too many objects left:", obj)
		os.Exit(1)
	}

    <tr>
        <td>HeapReleased</td>
        <td id="HeapReleased">{{.HeapReleased}} bytes</td>
        <td>Physical memory returned to the OS.</td>
    </tr>

    <tr>
        <td>HeapObjects</td>
        <td id="HeapObjects">{{.HeapObjects}} objects</td>
        <td>Number of allocated heap objects.</td>
    </tr>

    <tr>
        <td>StackInuse</td>
        <td id="StackInuse">{{.StackInuse}} bytes</td>

	// to the OS and has not yet been reacquired for the heap.
	HeapReleased uint64

	// HeapObjects is the number of allocated heap objects.
	//
	// Like HeapAlloc, this increases as objects are allocated and
	// decreases as the heap is swept and unreachable objects are
	// freed.
	HeapObjects uint64

	// Stack memory statistics.
	//
	// Stacks are not considered part of the heap, but the runtime

		"Lookups": {eq(uint64(0))}, "Mallocs": {nz, le(1e10)}, "Frees": {nz, le(1e10)},
		"HeapAlloc": {nz, le(1e10)}, "HeapSys": {nz, le(1e10)}, "HeapIdle": {le(1e10)},
		"HeapInuse": {nz, le(1e10)}, "HeapReleased": {le(1e10)}, "HeapObjects": {nz, le(1e10)},
		"StackInuse": {nz, le(1e10)}, "StackSys": {nz, le(1e10)},
		"MSpanInuse": {nz, le(1e10)}, "MSpanSys": {nz, le(1e10)},
		"MCacheInuse": {nz, le(1e10)}, "MCacheSys": {nz, le(1e10)},

	fmt.Fprintf(w, "# HeapIdle = %d\n", s.HeapIdle)
	fmt.Fprintf(w, "# HeapInuse = %d\n", s.HeapInuse)
	fmt.Fprintf(w, "# HeapReleased = %d\n", s.HeapReleased)
	fmt.Fprintf(w, "# HeapObjects = %d\n", s.HeapObjects)

	fmt.Fprintf(w, "# Stack = %d / %d\n", s.StackInuse, s.StackSys)
	fmt.Fprintf(w, "# MSpan = %d / %d\n", s.MSpanInuse, s.MSpanSys)
	fmt.Fprintf(w, "# MCache = %d / %d\n", s.MCacheInuse, s.MCacheSys)

	dumpint(m.Sys)
	dumpint(m.Lookups)
	dumpint(m.Mallocs)
	dumpint(m.Frees)
	dumpint(m.HeapAlloc)
	dumpint(m.HeapSys)
	dumpint(m.HeapIdle)
	dumpint(m.HeapInuse)
	dumpint(m.HeapReleased)
	dumpint(m.HeapObjects)
	dumpint(m.StackInuse)
	dumpint(m.StackSys)
	dumpint(m.MSpanInuse)
	dumpint(m.MSpanSys)
	dumpint(m.MCacheInuse)
	dumpint(m.MCacheSys)
	dumpint(m.BuckHashSys)
	dumpint(m.GCSys)
	dumpint(m.OtherSys)

			}
		case "/gc/gomemlimit:bytes":
			checkUint64(t, name, samples[i].Value.Uint64(), uint64(limit))
		case "/gc/heap/objects:objects":
			checkUint64(t, name, samples[i].Value.Uint64(), mstats.HeapObjects)
		case "/gc/heap/goal:bytes":
			checkUint64(t, name, samples[i].Value.Uint64(), mstats.NextGC)
		case "/gc/gogc:percent":
			checkUint64(t, name, samples[i].Value.Uint64(), uint64(gcPercent))

		{"MemStats.GCCPUFraction", Field, 5},
		{"MemStats.GCSys", Field, 2},
		{"MemStats.HeapAlloc", Field, 0},
		{"MemStats.HeapIdle", Field, 0},
		{"MemStats.HeapInuse", Field, 0},
		{"MemStats.HeapObjects", Field, 0},
		{"MemStats.HeapReleased", Field, 0},
		{"MemStats.HeapSys", Field, 0},
		{"MemStats.LastGC", Field, 0},
		{"MemStats.Lookups", Field, 0},
		{"MemStats.MCacheInuse", Field, 0},