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 r8894 = x;
        double r8895 = 1.0;
        double r8896 = r8894 + r8895;
        double r8897 = sqrt(r8896);
        double r8898 = sqrt(r8894);
        double r8899 = r8897 - r8898;
        double r8900 = y;
        double r8901 = r8900 + r8895;
        double r8902 = sqrt(r8901);
        double r8903 = sqrt(r8900);
        double r8904 = r8902 - r8903;
        double r8905 = r8899 + r8904;
        double r8906 = z;
        double r8907 = r8906 + r8895;
        double r8908 = sqrt(r8907);
        double r8909 = sqrt(r8906);
        double r8910 = r8908 - r8909;
        double r8911 = r8905 + r8910;
        double r8912 = t;
        double r8913 = r8912 + r8895;
        double r8914 = sqrt(r8913);
        double r8915 = sqrt(r8912);
        double r8916 = r8914 - r8915;
        double r8917 = r8911 + r8916;
        return r8917;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(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