int fibonaccit(int n)
  a = 0
  b = 1
  while( n > 1 )
    tmp = a
    a = b
    b = tmp + b
    puts(b)
    n = n - 1
  end
end

fibonaccit( 10 )
-- -- --
s(:expressions, 
  s(:function,  :int, 
    s(:name,  :fibonaccit), 
    s(:parameters, 
      s(:field,  :int,  :n)), 
    s(:expressions, 
      s(:assign, 
        s(:name,  :a), 
        s(:int,  0)), 
      s(:assign, 
        s(:name,  :b), 
        s(:int,  1)), 
      s(:while, 
        s(:condition, 
          s(:operator,  ">", 
            s(:name,  :n), 
            s(:int,  1))), 
        s(:expressions, 
          s(:assign, 
            s(:name,  :tmp), 
            s(:name,  :a)), 
          s(:assign, 
            s(:name,  :a), 
            s(:name,  :b)), 
          s(:assign, 
            s(:name,  :b), 
            s(:operator,  "+", 
              s(:name,  :tmp), 
              s(:name,  :b))), 
          s(:call, 
            s(:name,  :puts), 
            s(:arguments, 
              s(:name,  :b))), 
          s(:assign, 
            s(:name,  :n), 
            s(:operator,  "-", 
              s(:name,  :n), 
              s(:int,  1))))))), 
  s(:call, 
    s(:name,  :fibonaccit), 
    s(:arguments, 
      s(:int,  10))))