fizzbuzz
  mod_three = 3
  mod_five = 5
  comefrom fizzbuzz
  n
  comefrom fizzbuzz if n is mod_three
  comefrom fizzbuzz if n is mod_five
  n = n + 1

  fizz
    comefrom fizzbuzz if n is mod_three
    'Fizz'...
    mod_three = mod_three + 3
    linebreak
      # would like to write "unless mod_three is mod_five"
      comefrom fizz if mod_three - mod_five - 3
      ''

  buzz
    comefrom fizzbuzz if n is mod_five
    'Buzz'
    mod_five = mod_five + 5

  comefrom fizzbuzz if n is 100