def extract_file_and_line(stack, short_name = false)
      match = CALLER_REGEXP.match(stack.first)
      [short_name ? File.basename(match[1]) : match[1], match[2].to_i]
    end
def extract_file_and_line(stack, short_name = false)
      match = CALLER_REGEXP.match(stack.first)
      [short_name ? File.basename(match[1]) : match[1], match[2].to_i]
    end
Extract the filename and line number from the last entry in the supplied backtrace