\[x = 77617 \land y = 33096\]

\[\left(\left(333.75 \cdot {y}^{6} + \left(x \cdot x\right) \cdot \left(\left(\left(\left(\left(\left(11 \cdot x\right) \cdot x\right) \cdot y\right) \cdot y - {y}^{6}\right) - 121 \cdot {y}^{4}\right) - 2\right)\right) + 5.5 \cdot {y}^{8}\right) + \frac{x}{2 \cdot y}\]

\left(\left(333.75 \cdot {y}^{6} + \left(x \cdot x\right) \cdot \left(\left(\left(\left(\left(\left(11 \cdot x\right) \cdot x\right) \cdot y\right) \cdot y - {y}^{6}\right) - 121 \cdot {y}^{4}\right) - 2\right)\right) + 5.5 \cdot {y}^{8}\right) + \frac{x}{2 \cdot y}

double f(double x, double y) {
        double r8129 = 333.75;
        double r8130 = y;
        double r8131 = 6.0;
        double r8132 = pow(r8130, r8131);
        double r8133 = r8129 * r8132;
        double r8134 = x;
        double r8135 = r8134 * r8134;
        double r8136 = 11.0;
        double r8137 = r8136 * r8134;
        double r8138 = r8137 * r8134;
        double r8139 = r8138 * r8130;
        double r8140 = r8139 * r8130;
        double r8141 = r8140 - r8132;
        double r8142 = 121.0;
        double r8143 = 4.0;
        double r8144 = pow(r8130, r8143);
        double r8145 = r8142 * r8144;
        double r8146 = r8141 - r8145;
        double r8147 = 2.0;
        double r8148 = r8146 - r8147;
        double r8149 = r8135 * r8148;
        double r8150 = r8133 + r8149;
        double r8151 = 5.5;
        double r8152 = 8.0;
        double r8153 = pow(r8130, r8152);
        double r8154 = r8151 * r8153;
        double r8155 = r8150 + r8154;
        double r8156 = r8147 * r8130;
        double r8157 = r8134 / r8156;
        double r8158 = r8155 + r8157;
        return r8158;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019179 
(FPCore (x y)
  :name "Rump's expression from Stadtherr's award speech"
  :pre (and (== x 77617.0) (== y 33096.0))
  (+ (+ (+ (* 333.75 (pow y 6.0)) (* (* x x) (- (- (- (* (* (* (* 11.0 x) x) y) y) (pow y 6.0)) (* 121.0 (pow y 4.0))) 2.0))) (* 5.5 (pow y 8.0))) (/ x (* 2.0 y))))

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