func subscript(x uint64) string {
	const w = len("₀") // all digits 0...9 have the same utf8 width
	var buf [32 * w]byte
	i := len(buf)
	for {
		i -= w
		utf8.EncodeRune(buf[i:], '₀'+rune(x%10)) // '₀' == U+2080
		x /= 10
		if x == 0 {
			break
		}
	}
	return string(buf[i:])

	"complex128": true,
	"error":      true,
	"float32":    true,
	"float64":    true,
	"int":        true,
	"int8":       true,
	"int16":      true,
	"int32":      true,
	"int64":      true,
	"rune":       true,
	"string":     true,
	"uint":       true,
	"uint8":      true,
	"uint16":     true,
	"uint32":     true,
	"uint64":     true,
	"uintptr":    true,
}

	{V([]byte("bytes3")), V([]byte("bytes3"))},
	{V(MyString("runes♝")), V([]rune("runes♝"))},
	{V([]rune("runes♕")), V(MyString("runes♕"))},
	{V([]rune("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
	{V([]rune("runes🙈🙉🙊")), V(MyRunes("runes🙈🙉🙊"))},
	{V(MyRunes("runes🙈🙉🙊")), V([]rune("runes🙈🙉🙊"))},
	{V(int('a')), V(MyString("a"))},
	{V(int8('a')), V(MyString("a"))},

		// check that a (possibly untyped) integer range expression x
		// is valid.
		// We do this by checking the assignment _ = x. This ensures
		// that an untyped x can be converted to a value of its default
		// type (rune or int).
		check.assignment(&x, nil, "range clause")
	}

	check.stmt(inner, s.Body)
}

// rangeKeyVal returns the key and value type produced by a range clause
// over an expression of type typ.

			prefix, std, suffix := NextStdChunk(s)
			out += prefix
			if std > 0 {
				out += "(" + StdChunkNames[std] + ")"
			}
			s = suffix
		}
		return out
	}

	noParens := func(r rune) rune {
		if r == '(' || r == ')' {
			return -1
		}
		return r
	}

	for _, marked := range nextStdChunkTests {
		// marked is an expected output from markChunks.

		typ string
		val string
	}{
		{"bool", "false"},
		{"int", "-1"},
		{"uint", "1.0"},
		{"rune", "'a'"},
		{"float64", "3.5"},
		{"complex64", "1.25"},
		{"string", "\"foo\""},

		// some more complex constraints
		{"~byte", "1"},
		{"~int | ~float64 | complex128", "1"},
		{"~uint64 | ~rune", "'X'"},
	}

	for _, test := range tests {

func isTest(name, prefix string) bool {
	if !strings.HasPrefix(name, prefix) {
		return false
	}
	if len(name) == len(prefix) { // "Test" is ok
		return true
	}
	rune, _ := utf8.DecodeRuneInString(name[len(prefix):])
	return !unicode.IsLower(rune)
}

type coverInfo struct {
	Package *Package
	Vars    map[string]*CoverVar
}

// loadTestFuncs returns the testFuncs describing the tests that will be run.

		// check that a (possibly untyped) integer range expression x
		// is valid.
		// We do this by checking the assignment _ = x. This ensures
		// that an untyped x can be converted to a value of its default
		// type (rune or int).
		check.assignment(&x, nil, "range clause")
	}

	check.stmt(inner, s.Body)
}

// RangeKeyVal returns the key and value types for a range over typ.

		}
		if addr != &y[0] {
			t.Errorf("bytes: unnecessary reallocation")
		}
	}
	// general slice
	{
		x := []rune("abcd")
		enc := NewEncoder(buf)
		err := enc.Encode(x)
		if err != nil {
			t.Errorf("ints: encode: %s", err)
		}
		// Decode into y, which is big enough.
		y := []rune("ABCDE")
		addr := &y[0]
		dec := NewDecoder(buf)
		err = dec.Decode(&y)
		if err != nil {

		typ string
		val string
	}{
		{"bool", "false"},
		{"int", "-1"},
		{"uint", "1.0"},
		{"rune", "'a'"},
		{"float64", "3.5"},
		{"complex64", "1.25"},
		{"string", "\"foo\""},

		// some more complex constraints
		{"~byte", "1"},
		{"~int | ~float64 | complex128", "1"},
		{"~uint64 | ~rune", "'X'"},
	}

	for _, test := range tests {