const runtime.spanAllocHeap

8 uses

	runtime (current package)
		mheap.go#L883: 	spanAllocHeap          spanAllocType = iota // heap span
		mheap.go#L891: 	return s != spanAllocHeap
		mheap.go#L910: 		s = h.allocSpan(npages, spanAllocHeap, spanclass)
		mheap.go#L1275: 	if typ == spanAllocHeap {
		mheap.go#L1287: 	case spanAllocHeap:
		mheap.go#L1417: 		h.freeSpanLocked(s, spanAllocHeap)
		mheap.go#L1466: 	if typ == spanAllocHeap {
		mheap.go#L1476: 	case spanAllocHeap:

The pages are generated with Golds v0.2.8-preview. (GOOS=darwin GOARCH=arm64)