if testenv.Builder() != "" {
		maxTypes = 1e3 // restrict cache sizes on builders
	}

	// Dynamically generate many new types.
	types := make([]reflect.Type, maxTypes)
	fs := []reflect.StructField{{
		Type:  reflect.TypeFor[string](),
		Index: []int{0},
	}}
	for i := range types {
		fs[0].Name = fmt.Sprintf("TypeFieldsCache%d", i)
		types[i] = reflect.StructOf(fs)
	}

 func (d <type 29>) String () <type -16>;
>; IsVariadic () <type -15>; Elem () <type 26>; Field (i <type -11>) <type 30 "StructField" <type 31 struct { Name <type -16>; PkgPath <type -16>; Type <type 26>; Tag <type 32 "StructTag" <type -16>
 func (tag <type 32>) Get (key <type -16>) <type -16>;

	// Decoding into nil interface? Switch to non-reflect code.
	if v.Kind() == reflect.Interface && v.NumMethod() == 0 {
		oi := d.objectInterface()
		v.Set(reflect.ValueOf(oi))
		return nil
	}

	var fields structFields

	// Check type of target:
	//   struct or
	//   map[T1]T2 where T1 is string, an integer type,
	//             or an encoding.TextUnmarshaler
	switch v.Kind() {
	case reflect.Map:

pkg debug/buildinfo, func ReadFile(string) (*debug.BuildInfo, error)
pkg debug/buildinfo, type BuildInfo = debug.BuildInfo
pkg debug/dwarf, type BasicType struct, DataBitOffset int64
pkg debug/dwarf, type StructField struct, DataBitOffset int64
pkg debug/elf, const R_PPC64_RELATIVE = 22
pkg debug/elf, const R_PPC64_RELATIVE R_PPC64
pkg debug/plan9obj, var ErrNoSymbols error
pkg go/ast, method (*IndexListExpr) End() token.Pos

pkg os/user, type Group struct, Gid string
pkg os/user, type Group struct, Name string
pkg os/user, type UnknownGroupError string
pkg os/user, type UnknownGroupIdError string
pkg reflect, func StructOf([]StructField) Type
pkg reflect, method (StructTag) Lookup(string) (string, bool)
pkg runtime, func CallersFrames([]uintptr) *Frames
pkg runtime, func KeepAlive(interface{})

	}

	UncommonType struct {
		Name, PkgPath int
	}
	CommonType struct {
		Size, Hash, Alg, Align, FieldAlign, String, UncommonType int
	}
	Type struct {
		Typ, Ptr int
	}
	StructField struct {
		Name, PkgPath, Typ, Tag, Offset int
	}
	StructType struct {
		Fields int
	}
	PtrType struct {
		Elem int
	}
	SliceType struct {
		Elem int
	}
	ArrayType struct {

	}

	UncommonType	struct {
		Name, PkgPath int
	}
	CommonType	struct {
		Size, Hash, Alg, Align, FieldAlign, String, UncommonType int
	}
	Type	struct {
		Typ, Ptr int
	}
	StructField	struct {
		Name, PkgPath, Typ, Tag, Offset int
	}
	StructType	struct {
		Fields int
	}
	PtrType	struct {
		Elem int
	}
	SliceType	struct {
		Elem int
	}
	ArrayType	struct {

		{"QualType.Type", Field, 0},
		{"Reader", Type, 0},
		{"StructField", Type, 0},
		{"StructField.BitOffset", Field, 0},
		{"StructField.BitSize", Field, 0},
		{"StructField.ByteOffset", Field, 0},
		{"StructField.ByteSize", Field, 0},
		{"StructField.DataBitOffset", Field, 18},
		{"StructField.Name", Field, 0},
		{"StructField.Type", Field, 0},
		{"StructType", Type, 0},

	enc := NewEncoder(b)
	typ := reflect.TypeFor[int]()
	nested := reflect.ArrayOf(1, typ)
	for i := 0; i < 100; i++ {
		nested = reflect.ArrayOf(1, nested)
	}
	badStruct := reflect.New(reflect.StructOf([]reflect.StructField{{Name: "F", Type: nested}}))
	enc.Encode(badStruct.Interface())
	dec := NewDecoder(b)
	var output struct{ Hello int }
	expectedErr := "invalid nesting depth"

		switch {
		case visit.value.Kind() == reflect.Struct:
			for fi := 0; fi < visit.value.NumField(); fi++ {
				structField := visit.value.Type().Field(fi)
				valueField := visit.value.Field(fi)
				if valueField.CanSet() {
					toVisit = append(toVisit, testPath{path: visit.path + "." + structField.Name, value: valueField})
				}
			}

		case visit.value.Kind() == reflect.Slice:
			if !visit.value.IsNil() {