Exception for Main:z from

Math

\[\left(\left(\left(\sqrt{x + 1} - \sqrt{x}\right) + \left(\sqrt{y + 1} - \sqrt{y}\right)\right) + \left(\sqrt{z + 1} - \sqrt{z}\right)\right) + \left(\sqrt{t + 1} - \sqrt{t}\right)\]

C

double f(double x, double y, double z, double t) {
        double r9347 = x;
        double r9348 = 1.0;
        double r9349 = r9347 + r9348;
        double r9350 = sqrt(r9349);
        double r9351 = sqrt(r9347);
        double r9352 = r9350 - r9351;
        double r9353 = y;
        double r9354 = r9353 + r9348;
        double r9355 = sqrt(r9354);
        double r9356 = sqrt(r9353);
        double r9357 = r9355 - r9356;
        double r9358 = r9352 + r9357;
        double r9359 = z;
        double r9360 = r9359 + r9348;
        double r9361 = sqrt(r9360);
        double r9362 = sqrt(r9359);
        double r9363 = r9361 - r9362;
        double r9364 = r9358 + r9363;
        double r9365 = t;
        double r9366 = r9365 + r9348;
        double r9367 = sqrt(r9366);
        double r9368 = sqrt(r9365);
        double r9369 = r9367 - r9368;
        double r9370 = r9364 + r9369;
        return r9370;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 +o rules:numerics
(FPCore (x y z t)
  :name "Main:z from "

  :herbie-target
  (+ (+ (+ (/ 1.0 (+ (sqrt (+ x 1.0)) (sqrt x))) (/ 1.0 (+ (sqrt (+ y 1.0)) (sqrt y)))) (/ 1.0 (+ (sqrt (+ z 1.0)) (sqrt z)))) (- (sqrt (+ t 1.0)) (sqrt t)))

  (+ (+ (+ (- (sqrt (+ x 1.0)) (sqrt x)) (- (sqrt (+ y 1.0)) (sqrt y))) (- (sqrt (+ z 1.0)) (sqrt z))) (- (sqrt (+ t 1.0)) (sqrt t))))

Backtrace

get-representation: Unknown representation #f		L	C
loop	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	122	4
prepare-points	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	146	0
setup-prog!34	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	67	0
run-improve43	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	339	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28