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 r8617 = x;
        double r8618 = 1.0;
        double r8619 = r8617 + r8618;
        double r8620 = sqrt(r8619);
        double r8621 = sqrt(r8617);
        double r8622 = r8620 - r8621;
        double r8623 = y;
        double r8624 = r8623 + r8618;
        double r8625 = sqrt(r8624);
        double r8626 = sqrt(r8623);
        double r8627 = r8625 - r8626;
        double r8628 = r8622 + r8627;
        double r8629 = z;
        double r8630 = r8629 + r8618;
        double r8631 = sqrt(r8630);
        double r8632 = sqrt(r8629);
        double r8633 = r8631 - r8632;
        double r8634 = r8628 + r8633;
        double r8635 = t;
        double r8636 = r8635 + r8618;
        double r8637 = sqrt(r8636);
        double r8638 = sqrt(r8635);
        double r8639 = r8637 - r8638;
        double r8640 = r8634 + r8639;
        return r8640;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019179 
(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

result arity mismatch; expected number of values not received expected: 2 received: 1 in: local-binding form values...: 0		L	C
loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/extraction.rkt	25	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	217	0
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/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