ref: 184211fc26dcf3b7916d8210588ee1844606fa18 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)))