m[0] = 12345
	m[0] += 67890
	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)

	// spec examples
	var a = [...]int{0, 1, 2, 3, 4, 5, 6, 7}
	var s = make([]int, 6)
	var b = make([]byte, 5)
	n1 := copy(s, a[0:])            // n1 == 6, s == []int{0, 1, 2, 3, 4, 5}
	n2 := copy(s, s[2:])            // n2 == 4, s == []int{2, 3, 4, 5, 4, 5}
	n3 := copy(b, "Hello, World!")  // n3 == 5, b == []byte("Hello")
	_, _, _ = n1, n2, n3

	var t [][]int
	copy(t, t)