internal/frame/frame.go
func (f *Frame) GetLvar(i int) (interface{}, error) {
	v, err := f.stack.Get(i)
	if err != nil {
		return nil, errors.Wrap(err, "failed to get local variable at "+strconv.Itoa(i+f.mark))
	}
	return v, nil
}
func (f *Frame) GetLvar(i int) (interface{}, error) {
	v, err := f.stack.Get(i)
	if err != nil {
		return nil, errors.Wrap(err, "failed to get local variable at "+strconv.Itoa(i+f.mark))
	}
	return v, nil
}
// GetLvar gets the frame local variable at position i