func (v TS) String() string   { return Sprintf("S: %q", string(v)) }

func check(t *testing.T, got, want string) {
	if got != want {
		t.Error(got, "!=", want)
	}
}

func TestStringer(t *testing.T) {
	s := Sprintf("%v %v %v %v %v", TI(0), TI8(1), TI16(2), TI32(3), TI64(4))
	check(t, s, "I: 0 I8: 1 I16: 2 I32: 3 I64: 4")
	s = Sprintf("%v %v %v %v %v %v", TU(5), TU8(6), TU16(7), TU32(8), TU64(9), TUI(10))

	return fmt.Sprintf("string=%d", s.v)
}

type errorer struct {
	v int
}

func (s *errorer) Error() string {
	return fmt.Sprintf("error=%d", s.v)
}

func TestStringer(t *testing.T) {
	s := &myStringer{3}
	b := new(strings.Builder)
	tmpl := Must(New("x").Parse("{{.}}"))
	if err := tmpl.Execute(b, s); err != nil {
		t.Fatal(err)
	}
	var expect = "string=3"