ref: 4087d6af9678b53fb2d3d2d5f5f6a6feff8e8a2b
dir: /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)))