# File rinject.rb, line 223
  def to_log_warn(logger)
    if @verification_failures.size==0 and @case_failures.size==0
      # nothing to do, because no failure
    elsif @verification_failures.size==0
      # no verification_failures, but case_failures
      @case_failures.each do |cf|
        logger.warn(cf.to_s)
      end
    else
      # verification_failures
      @case_failures.each do |cf|
        @verification_failures.each do |vf|
          # if this verification_failure belongs to this case_failure
          if cf.fid == vf.fid
            logger.warn(vf.to_s)
          end
        end
        logger.warn(cf.to_s)
      end
    end
  end