oldbucket := bucket & it.h.oldbucketmask()
			b = (*bmap)(add(h.oldbuckets, oldbucket*uintptr(t.BucketSize)))
			if !evacuated(b) {
				checkBucket = bucket
			} else {
				b = (*bmap)(add(it.buckets, bucket*uintptr(t.BucketSize)))
				checkBucket = noCheck
			}
		} else {
			b = (*bmap)(add(it.buckets, bucket*uintptr(t.BucketSize)))
			checkBucket = noCheck
		}
		bucket++
		if bucket == bucketShift(it.B) {

	}
	if etyp.Size_ > abi.MapMaxElemBytes {
		mt.ValueSize = uint8(goarch.PtrSize)
		mt.Flags |= 2 // indirect value
	} else {
		mt.MapType.ValueSize = uint8(etyp.Size_)
	}
	mt.MapType.BucketSize = uint16(mt.Bucket.Size_)
	if isReflexive(ktyp) {
		mt.Flags |= 4
	}
	if needKeyUpdate(ktyp) {
		mt.Flags |= 8
	}
	if hashMightPanic(ktyp) {
		mt.Flags |= 16
	}
	mt.PtrToThis = 0