\[\frac{\pi}{\sin \left(\pi \cdot z\right)} \cdot \left(\left(\left(\sqrt{\pi \cdot 2} \cdot {\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}^{\left(\left(\left(1 - z\right) - 1\right) + 0.5\right)}\right) \cdot e^{-\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.99999999999980993 + \frac{676.520368121885099}{\left(\left(1 - z\right) - 1\right) + 1}\right) + \frac{-1259.13921672240281}{\left(\left(1 - z\right) - 1\right) + 2}\right) + \frac{771.32342877765313}{\left(\left(1 - z\right) - 1\right) + 3}\right) + \frac{-176.615029162140587}{\left(\left(1 - z\right) - 1\right) + 4}\right) + \frac{12.5073432786869052}{\left(\left(1 - z\right) - 1\right) + 5}\right) + \frac{-0.138571095265720118}{\left(\left(1 - z\right) - 1\right) + 6}\right) + \frac{9.98436957801957158 \cdot 10^{-6}}{\left(\left(1 - z\right) - 1\right) + 7}\right) + \frac{1.50563273514931162 \cdot 10^{-7}}{\left(\left(1 - z\right) - 1\right) + 8}\right)\right)\]
\frac{\pi}{\sin \left(\pi \cdot z\right)} \cdot \left(\left(\left(\sqrt{\pi \cdot 2} \cdot {\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}^{\left(\left(\left(1 - z\right) - 1\right) + 0.5\right)}\right) \cdot e^{-\left(\left(\left(\left(1 - z\right) - 1\right) + 7\right) + 0.5\right)}\right) \cdot \left(\left(\left(\left(\left(\left(\left(\left(0.99999999999980993 + \frac{676.520368121885099}{\left(\left(1 - z\right) - 1\right) + 1}\right) + \frac{-1259.13921672240281}{\left(\left(1 - z\right) - 1\right) + 2}\right) + \frac{771.32342877765313}{\left(\left(1 - z\right) - 1\right) + 3}\right) + \frac{-176.615029162140587}{\left(\left(1 - z\right) - 1\right) + 4}\right) + \frac{12.5073432786869052}{\left(\left(1 - z\right) - 1\right) + 5}\right) + \frac{-0.138571095265720118}{\left(\left(1 - z\right) - 1\right) + 6}\right) + \frac{9.98436957801957158 \cdot 10^{-6}}{\left(\left(1 - z\right) - 1\right) + 7}\right) + \frac{1.50563273514931162 \cdot 10^{-7}}{\left(\left(1 - z\right) - 1\right) + 8}\right)\right)
double f(double z) {
        double r8351 = atan2(1.0, 0.0);
        double r8352 = z;
        double r8353 = r8351 * r8352;
        double r8354 = sin(r8353);
        double r8355 = r8351 / r8354;
        double r8356 = 2.0;
        double r8357 = r8351 * r8356;
        double r8358 = sqrt(r8357);
        double r8359 = 1.0;
        double r8360 = r8359 - r8352;
        double r8361 = r8360 - r8359;
        double r8362 = 7.0;
        double r8363 = r8361 + r8362;
        double r8364 = 0.5;
        double r8365 = r8363 + r8364;
        double r8366 = r8361 + r8364;
        double r8367 = pow(r8365, r8366);
        double r8368 = r8358 * r8367;
        double r8369 = -r8365;
        double r8370 = exp(r8369);
        double r8371 = r8368 * r8370;
        double r8372 = 0.9999999999998099;
        double r8373 = 676.5203681218851;
        double r8374 = r8361 + r8359;
        double r8375 = r8373 / r8374;
        double r8376 = r8372 + r8375;
        double r8377 = -1259.1392167224028;
        double r8378 = r8361 + r8356;
        double r8379 = r8377 / r8378;
        double r8380 = r8376 + r8379;
        double r8381 = 771.3234287776531;
        double r8382 = 3.0;
        double r8383 = r8361 + r8382;
        double r8384 = r8381 / r8383;
        double r8385 = r8380 + r8384;
        double r8386 = -176.6150291621406;
        double r8387 = 4.0;
        double r8388 = r8361 + r8387;
        double r8389 = r8386 / r8388;
        double r8390 = r8385 + r8389;
        double r8391 = 12.507343278686905;
        double r8392 = 5.0;
        double r8393 = r8361 + r8392;
        double r8394 = r8391 / r8393;
        double r8395 = r8390 + r8394;
        double r8396 = -0.13857109526572012;
        double r8397 = 6.0;
        double r8398 = r8361 + r8397;
        double r8399 = r8396 / r8398;
        double r8400 = r8395 + r8399;
        double r8401 = 9.984369578019572e-06;
        double r8402 = r8401 / r8363;
        double r8403 = r8400 + r8402;
        double r8404 = 1.5056327351493116e-07;
        double r8405 = 8.0;
        double r8406 = r8361 + r8405;
        double r8407 = r8404 / r8406;
        double r8408 = r8403 + r8407;
        double r8409 = r8371 * r8408;
        double r8410 = r8355 * r8409;
        return r8410;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019194 +o rules:numerics
(FPCore (z)
  :name "Jmat.Real.gamma, branch z less than 0.5"
  (* (/ PI (sin (* PI z))) (* (* (* (sqrt (* PI 2.0)) (pow (+ (+ (- (- 1.0 z) 1.0) 7.0) 0.5) (+ (- (- 1.0 z) 1.0) 0.5))) (exp (- (+ (+ (- (- 1.0 z) 1.0) 7.0) 0.5)))) (+ (+ (+ (+ (+ (+ (+ (+ 0.9999999999998099 (/ 676.5203681218851 (+ (- (- 1.0 z) 1.0) 1.0))) (/ -1259.1392167224028 (+ (- (- 1.0 z) 1.0) 2.0))) (/ 771.3234287776531 (+ (- (- 1.0 z) 1.0) 3.0))) (/ -176.6150291621406 (+ (- (- 1.0 z) 1.0) 4.0))) (/ 12.507343278686905 (+ (- (- 1.0 z) 1.0) 5.0))) (/ -0.13857109526572012 (+ (- (- 1.0 z) 1.0) 6.0))) (/ 9.984369578019572e-06 (+ (- (- 1.0 z) 1.0) 7.0))) (/ 1.5056327351493116e-07 (+ (- (- 1.0 z) 1.0) 8.0))))))

Backtrace

result arity mismatch; expected number of values not received expected: 2 received: 1 in: local-binding form values...: 0LC
loop/data/pavpan/nightlies/herbie/various-cleanup/src/core/extraction.rkt252
(unnamed)/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt260
simplify!/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt2200
run-improve47/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt3420
(unnamed)/opt/racket-7.0/collects/racket/private/more-scheme.rkt26128
run/opt/racket-7.0/share/pkgs/profile-lib/main.rkt392
profile-thunk16/opt/racket-7.0/share/pkgs/profile-lib/main.rkt90
(unnamed)/opt/racket-7.0/collects/racket/private/more-scheme.rkt26128