m[0] /= 123
	m[0] %= 456

	const want = (12345 + 67890) / 123 % 456
	if got := m[0]; got != want {
		t.Errorf("got %d, want %d", got, want)
	}
}

var sinkAppend bool

func TestMapAppendAssignment(t *testing.T) {
	m := make(map[int][]int, 0)

	m[0] = nil
	m[0] = append(m[0], 12345)
	m[0] = append(m[0], 67890)
	sinkAppend, m[0] = !sinkAppend, append(m[0], 123, 456)
	a := []int{7, 8, 9, 0}