}

		switch n1 := n - startingField; n1 {
		case 0:
			return bytesEncoder(nil), nil
		case 1:
			return makeField(v.Field(startingField), parseFieldParameters(t.Field(startingField).Tag.Get("asn1")))
		default:
			m := make([]encoder, n1)
			for i := 0; i < n1; i++ {
				m[i], err = makeField(v.Field(i+startingField), parseFieldParameters(t.Field(i+startingField).Tag.Get("asn1")))
				if err != nil {
					return nil, err

		return deferType
	}

	makefield := func(name string, t *types.Type) *types.Field {
		sym := (*types.Pkg)(nil).Lookup(name)
		return types.NewField(src.NoXPos, sym, t)
	}

	fields := []*types.Field{
		makefield("heap", types.Types[types.TBOOL]),
		makefield("rangefunc", types.Types[types.TBOOL]),
		makefield("sp", types.Types[types.TUINTPTR]),
		makefield("pc", types.Types[types.TUINTPTR]),