Method stacked_error

oneflow/core/common/error.h:137–137

  ~Error() = default;

  std::shared_ptr<StackedError> stacked_error() const { return stacked_error_; }
  const ErrorProto* operator->() const { return stacked_error_->error_proto().get(); }
  ErrorProto* operator->() { return stacked_error_->mut_error_proto(); }
  operator std::string() const;