// Although rune and int32 are represented by the same type, only a subset
			// of valid int32 values can be expressed as rune literals. Notably,
			// negative numbers, surrogate halves, and values above unicode.MaxRune
			// have no quoted representation.
			//
			// fmt with "%q" (and the corresponding functions in the strconv package)
			// would quote out-of-range values to the Unicode replacement character

	return constant.MakeUnknown()
}

func tostr(v constant.Value) constant.Value {
	if v.Kind() == constant.Int {
		r := unicode.ReplacementChar
		if x, ok := constant.Uint64Val(v); ok && x <= unicode.MaxRune {
			r = rune(x)
		}
		v = constant.MakeString(string(r))
	}
	return v
}

func makeFloat64(f float64) constant.Value {
	if math.IsInf(f, 0) {
		base.Fatalf("infinity is not a valid constant")

				j++
			}
			if j-i < 1 || j-i > 7 || j >= len(s) || s[j] != ';' {
				return nil, 0, 0, false
			}
			r, _ = strconv.Atoi(s[i:j])
			end = j + 1
		}
		if r > unicode.MaxRune || r == 0 {
			r = unicode.ReplacementChar
		}
		return &Plain{string(rune(r))}, start, end, true
	}

	// Max name in list is 32 bytes. Try for 64 for good measure.

		n, base, max = 3, 8, 255
	case 'x':
		s.next()
		n, base, max = 2, 16, 255
	case 'u':
		s.next()
		n, base, max = 4, 16, unicode.MaxRune
	case 'U':
		s.next()
		n, base, max = 8, 16, unicode.MaxRune
	default:
		msg := "unknown escape sequence"
		if s.ch < 0 {
			msg = "escape sequence not terminated"
		}
		s.error(offs, msg)
		return false
	}

		}
	}
}

func TestWriteInvalidRune(t *testing.T) {
	// Invalid runes, including negative ones, should be written as
	// utf8.RuneError.
	for _, r := range []rune{-1, utf8.MaxRune + 1} {
		var buf Buffer
		buf.WriteRune(r)
		check(t, fmt.Sprintf("TestWriteInvalidRune (%d)", r), &buf, "\uFFFD")
	}
}

func TestNext(t *testing.T) {
	b := []byte{0, 1, 2, 3, 4}

		k := 0
		for delta > ((base-tmin)*tmax)/2 {
			delta /= base - tmin
			k += base
		}
		bias = k + ((base-tmin+1)*delta)/(delta+skew)

		n += i / (len(output) + 1)
		if n > utf8.MaxRune {
			rst.fail("punycode rune overflow")
		} else if !utf8.ValidRune(rune(n)) {
			rst.fail("punycode invalid code point")
		}
		i %= len(output) + 1
		output = append(output, 0)
		copy(output[i+1:], output[i:])

			return
		}

		typ := n.Type()
		val := n.Val()

		// Special case for rune constants.
		if typ == types.RuneType || typ == types.UntypedRune {
			if x, ok := constant.Uint64Val(val); ok && x <= utf8.MaxRune {
				fmt.Fprintf(s, "%q", x)
				return
			}
		}

		// Only include typ if it's neither the default nor untyped type
		// for the constant value.

		}
		if synerr.Msg != tt.err {
			t.Fatalf("input %d synerr.Msg wrong: want %q, got %q", i, tt.err, synerr.Msg)
		}
	}
}

func TestIsInCharacterRange(t *testing.T) {
	invalid := []rune{
		utf8.MaxRune + 1,
		0xD800, // surrogate min
		0xDFFF, // surrogate max
		-1,
	}
	for _, r := range invalid {
		if isInCharacterRange(r) {
			t.Errorf("rune %U considered valid", r)
		}
	}
}

				}
				if b != ';' {
					d.ungetc(b)
				} else {
					s := string(d.buf.Bytes()[start:])
					d.buf.WriteByte(';')
					n, err := strconv.ParseUint(s, base, 64)
					if err == nil && n <= unicode.MaxRune {
						text = string(rune(n))
						haveText = true
					}
				}
			} else {
				d.ungetc(b)
				if !d.readName() {
					if d.err != nil {
						return nil
					}
				}

		}
	}
}

func TestWriteInvalidRune(t *testing.T) {
	// Invalid runes, including negative ones, should be written as the
	// replacement character.
	for _, r := range []rune{-1, utf8.MaxRune + 1} {
		var buf strings.Builder
		w := NewWriter(&buf)
		w.WriteRune(r)
		w.Flush()
		if s := buf.String(); s != "\uFFFD" {
			t.Errorf("WriteRune(%d) wrote %q, not replacement character", r, s)
		}
	}