ref: 3cb3a733aa6d3c48f8695ed78a35af9710e1c406
dir: /test/pisum.lsp/
(define (pisum)
(dotimes (j 500)
((label sumloop
(λ (i sum)
(if (> i 10000)
sum
(sumloop (+ i 1) (+ sum (/ (* i i)))))))
1.0 0.0)))