# File lib/sup/buffer.rb, line 416
  def kill_all_buffers_safely
    until @buffers.empty?
      ## inbox mode always claims it's unkillable. we'll ignore it.
      return false unless @buffers.last.mode.is_a?(InboxMode) || @buffers.last.mode.killable?
      kill_buffer @buffers.last
    end
    true
  end