# File lib/ruby-progressbar/progress.rb, line 37
  def increment
    if progress == total
      warn "WARNING: Your progress bar is currently at #{progress} out of #{total} " \
           "and cannot be incremented. In v2.0.0 this will become a " \
           "ProgressBar::InvalidProgressError."
    end

    self.progress += 1 unless progress == total
  end