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

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

\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 r8111 = 333.75;
        double r8112 = y;
        double r8113 = 6.0;
        double r8114 = pow(r8112, r8113);
        double r8115 = r8111 * r8114;
        double r8116 = x;
        double r8117 = r8116 * r8116;
        double r8118 = 11.0;
        double r8119 = r8118 * r8116;
        double r8120 = r8119 * r8116;
        double r8121 = r8120 * r8112;
        double r8122 = r8121 * r8112;
        double r8123 = r8122 - r8114;
        double r8124 = 121.0;
        double r8125 = 4.0;
        double r8126 = pow(r8112, r8125);
        double r8127 = r8124 * r8126;
        double r8128 = r8123 - r8127;
        double r8129 = 2.0;
        double r8130 = r8128 - r8129;
        double r8131 = r8117 * r8130;
        double r8132 = r8115 + r8131;
        double r8133 = 5.5;
        double r8134 = 8.0;
        double r8135 = pow(r8112, r8134);
        double r8136 = r8133 * r8135;
        double r8137 = r8132 + r8136;
        double r8138 = r8129 * r8112;
        double r8139 = r8116 / r8138;
        double r8140 = r8137 + r8139;
        return r8140;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019194 
(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	220	0
run-improve47	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	342	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