# File lib/pry/code.rb, line 199
    def take_lines(start_line, num_lines)
      if start_line >= 0
        start_idx = @lines.index { |l| l.last >= start_line } || @lines.length
      else
        start_idx = @lines.length + start_line
      end

      alter do
        @lines = @lines.slice(start_idx, num_lines)
      end
    end