if !Equal(s, want) {
		t.Errorf("got %v, want %v", s, want)
	}
}

var iterTests = [][]string{
	nil,
	{"a"},
	{"a", "b"},
	{"b", "a"},
	strs[:],
}

func TestValuesAppendSeq(t *testing.T) {
	for _, prefix := range iterTests {
		for _, s := range iterTests {
			got := AppendSeq(prefix, Values(s))
			want := append(prefix, s...)
			if !Equal(got, want) {