ref: f1fe3edd47f3250db4de381fe3cbfd242028a70e
dir: /femtolisp/tests/pisum.lsp/
(define (pisum)
(dotimes (j 500)
((label sumloop
(lambda (i sum)
(if (> i 10000)
sum
(sumloop (+ i 1) (+ sum (/ (* i i)))))))
1.0 0.0)))