\[\left(\left(x \cdot \log y - y\right) - z\right) + \log t\]

\left(\left(x \cdot \log y - y\right) - z\right) + \log t

double f(double x, double y, double z, double t) {
        double r8015 = x;
        double r8016 = y;
        double r8017 = log(r8016);
        double r8018 = r8015 * r8017;
        double r8019 = r8018 - r8016;
        double r8020 = z;
        double r8021 = r8019 - r8020;
        double r8022 = t;
        double r8023 = log(r8022);
        double r8024 = r8021 + r8023;
        return r8024;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (x y z t)
  :name "Numeric.SpecFunctions:incompleteGamma from math-functions-0.1.5.2, A"
  (+ (- (- (* x (log y)) y) z) (log t)))

Backtrace

get-representation: Unknown representation #f		L	C
loop	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	122	4
prepare-points	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	146	0
setup-prog!34	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	67	0
run-improve43	/data/pavpan/nightlies/herbie/interface2/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