\[e^{\left(x + y \cdot \log y\right) - z}\]
e^{\left(x + y \cdot \log y\right) - z}
double f(double x, double y, double z) {
        double r16569883 = x;
        double r16569884 = y;
        double r16569885 = log(r16569884);
        double r16569886 = r16569884 * r16569885;
        double r16569887 = r16569883 + r16569886;
        double r16569888 = z;
        double r16569889 = r16569887 - r16569888;
        double r16569890 = exp(r16569889);
        return r16569890;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019174 
(FPCore (x y z)
  :name "Statistics.Distribution.Poisson.Internal:probability from math-functions-0.1.5.2"

  :herbie-target
  (exp (+ (- x z) (* (log y) y)))

  (exp (- (+ x (* y (log y))) z)))

Backtrace

denominator: contract violation expected: rational? given: +nan.0LC
composed/opt/racket-7.0/collects/racket/private/list.rkt32116
group-by61/opt/racket-7.0/collects/racket/list.rkt7710
make-multiplication-subnode/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/reduce.rkt2440
make-multiplication-node/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/reduce.rkt2340
simplify/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/reduce.rkt160
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
for-loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt51759
parse-loop402/opt/racket-7.0/collects/racket/match/compiler.rkt41815
for-loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt51435
(unnamed)/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt51023
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
for-loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt30427
(unnamed)/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt30123
hash-ref!/opt/racket-7.0/collects/racket/private/more-scheme.rkt3762
loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt2682
taylor/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt1700
for-loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt3018
approximate9/data/pavpan/nightlies/herbie/move-sample-ranges/src/core/taylor.rkt120
(unnamed)/opt/racket-7.0/collects/racket/contract/private/arrow-higher-order.rkt35733
location-do/data/pavpan/nightlies/herbie/move-sample-ranges/src/programs.rkt640
(unnamed)/opt/racket-7.0/collects/racket/contract/private/arrow-higher-order.rkt35733
for-loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/mainloop.rkt1456
taylor-alt/data/pavpan/nightlies/herbie/move-sample-ranges/src/mainloop.rkt1390
for-loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/mainloop.rkt1607
gen-series!/data/pavpan/nightlies/herbie/move-sample-ranges/src/mainloop.rkt1530
run-iter!/data/pavpan/nightlies/herbie/move-sample-ranges/src/mainloop.rkt3200
for-loop/data/pavpan/nightlies/herbie/move-sample-ranges/src/mainloop.rkt3544
run-improve43/data/pavpan/nightlies/herbie/move-sample-ranges/src/mainloop.rkt3390
(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