def display_lines(min, max)
      puts "\n[#{min}, #{max}] in #{frame.file}"

      puts source_file_formatter.lines(min, max).join
    end
def display_lines(min, max)
      puts "\n[#{min}, #{max}] in #{frame.file}"

      puts source_file_formatter.lines(min, max).join
    end
Show a range of lines in the current file.

 @param min [Integer] Lower bound
 @param max [Integer] Upper bound