Exception for math.exp on complex, real part

Math

\[e^{re} \cdot \cos im\]

C

double f(double re, double im) {
        double r8161 = re;
        double r8162 = exp(r8161);
        double r8163 = im;
        double r8164 = cos(r8163);
        double r8165 = r8162 * r8164;
        return r8165;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (re im)
  :name "math.exp on complex, real part"
  (* (exp re) (cos im)))

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