ref: 8b59a493d6b5e51811321339450bddbe2aa56c24 dir: /test/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)))