Here's a fix for the bug. (Marc, can you change this in _num.scm?) In the directory gambc-4.0b22 do a make bootstrap and then replace ##exact-int.div in lib/_num.scm with (define-prim (##exact-int.div x y) (cond ((##eq? y 1) (##cons x 0)) ((##eq? y -1) (##cons (##negate x) 0)) ((##eq? x y) ;; can come up in rational arithmetic (##cons 1 0)) ((and (##fixnum? x) (##fixnum? y)) (##cons (##fixnum.quotient x y) ; note: y can't be -1 (##fixnum.remainder x y))) (else (let* ((x-negative? (##negative? x)) (abs-x (if x-negative? (##negate x) x)) (y-negative? (##negative? y)) (abs-y (if y-negative? (##negate y) y))) (if (##< abs-x abs-y) (##cons 0 x) ;; at least one of x and y is a bignum, so ;; here abs-x must be a bignum (let ((result (##bignum.div abs-x abs-y))) (if (##not (##eq? x-negative? y-negative?)) (##set-car! result (##negate (##car result)))) (if x-negative? (##set-cdr! result (##negate (##cdr result)))) result)))))) then do a make/make install again. The program now works. BTW, "display" in gambit does
(display '(1 2 3 4 5)) 12345>
which I presume is not what you want at the end of your test program, so I suggest you replace "display" with "pretty-print" or "write". Brad