// Fill a map.
	for i := 0; i < N; i++ {
		m[i] = i
	}
	runtime.MapTombstoneCheck(m)
	// Delete half of the entries.
	for i := 0; i < N; i += 2 {
		delete(m, i)
	}
	runtime.MapTombstoneCheck(m)
	// Add new entries to fill in holes.
	for i := N; i < 3*N/2; i++ {
		m[i] = i
	}
	runtime.MapTombstoneCheck(m)
	// Delete everything.
	for i := 0; i < 3*N/2; i++ {
		delete(m, i)
	}

		g0.stackguard1 = g0.stackguard0

		stackOverflow(nil)
	})
}

func stackOverflow(x *byte) {
	var buf [256]byte
	stackOverflow(&buf[0])
}

func MapTombstoneCheck(m map[int]int) {
	// Make sure emptyOne and emptyRest are distributed correctly.
	// We should have a series of filled and emptyOne cells, followed by
	// a series of emptyRest cells.
	h := *(**hmap)(unsafe.Pointer(&m))