gcController.totalAlloc.Add(bytesAllocated)

		// Clear the second allocCount just to be safe.
		s.allocCountBeforeCache = 0
	}

	// Get a new cached span from the central lists.
	s = mheap_.central[spc].mcentral.cacheSpan()
	if s == nil {
		throw("out of memory")
	}

	if s.allocCount == s.nelems {
		throw("span has no free space")
	}

havespan:
	if !traceDone {
		trace := traceAcquire()
		if trace.ok() {
			trace.GCSweepDone()
			traceRelease(trace)
		}
	}
	n := int(s.nelems) - int(s.allocCount)
	if n == 0 || s.freeindex == s.nelems || s.allocCount == s.nelems {
		throw("span has no free objects")
	}
	freeByteBase := s.freeindex &^ (64 - 1)
	whichByte := freeByteBase / 8
	// Init alloc bits cache.
	s.refillAllocCache(whichByte)

		throw("freeIndex is not valid")
	}

	v = gclinkptr(uintptr(freeIndex)*s.elemsize + s.base())
	s.allocCount++
	if s.allocCount > s.nelems {
		println("s.allocCount=", s.allocCount, "s.nelems=", s.nelems)
		throw("s.allocCount > s.nelems")
	}
	return
}

// Allocate an object of size bytes.
// Small objects are allocated from the per-P cache's free lists.

	if s == nil {
		// no free stacks. Allocate another span worth.
		s = mheap_.allocManual(_StackCacheSize>>_PageShift, spanAllocStack)
		if s == nil {
			throw("out of memory")
		}
		if s.allocCount != 0 {
			throw("bad allocCount")
		}
		if s.manualFreeList.ptr() != nil {
			throw("bad manualFreeList")
		}
		osStackAlloc(s)
		s.elemsize = fixedStack << order

	nalloc := uint16(s.countAlloc())
	nfreed := s.allocCount - nalloc
	if nalloc > s.allocCount {
		// The zombie check above should have caught this in
		// more detail.
		print("runtime: nelems=", s.nelems, " nalloc=", nalloc, " previous allocCount=", s.allocCount, " nfreed=", nfreed, "\n")
		throw("sweep increased allocation count")
	}

	s.allocCount = nalloc
	s.freeindex = 0 // reset allocation index to start of span.

	case mSpanManual:
		if s.allocCount != 0 {
			throw("mheap.freeSpanLocked - invalid stack free")
		}
	case mSpanInUse:
		if s.isUserArenaChunk {
			throw("mheap.freeSpanLocked - invalid free of user arena chunk")
		}
		if s.allocCount != 0 || s.sweepgen != h.sweepgen {
			print("mheap.freeSpanLocked - span ", s, " ptr ", hex(s.base()), " allocCount ", s.allocCount, " sweepgen ", s.sweepgen, "/", h.sweepgen, "\n")

			if sizeclass := s.spanclass.sizeclass(); sizeclass == 0 {
				slow.Mallocs++
				slow.Alloc += uint64(s.elemsize)
			} else {
				slow.Mallocs += uint64(s.allocCount)
				slow.Alloc += uint64(s.allocCount) * uint64(s.elemsize)
				bySize[sizeclass].Mallocs += uint64(s.allocCount)
			}
		}

		// Add in frees by just reading the stats for those directly.
		var m heapStatsDelta
		memstats.heapStats.unsafeRead(&m)

	h.initSpan(s, spanAllocHeap, spc, base, userArenaChunkPages)
	s.isUserArenaChunk = true
	s.elemsize -= userArenaChunkReserveBytes()
	s.limit = s.base() + s.elemsize
	s.freeindex = 1
	s.allocCount = 1

	// Account for this new arena chunk memory.
	gcController.heapInUse.add(int64(userArenaChunkBytes))
	gcController.heapReleased.add(-int64(userArenaChunkBytes))

	stats := memstats.heapStats.acquire()

  ASSERT_EQ(c, TaggedValue(3.f));
}

namespace {
int alloc_count = 0;
class Cool {
 public:
  Cool() { alloc_count++; }
  ~Cool() { alloc_count--; }
};
}  // namespace

TEST(Test1, TestCapsule) {
  TaggedValue test_moved, test_copy;
  ASSERT_EQ(alloc_count, 0);
  void* ptr_value = new Cool();
  {
    TaggedValue capsule =