Exception for math.exp on complex, real part

Math

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

C

double f(double re, double im) {
        double r8229 = re;
        double r8230 = exp(r8229);
        double r8231 = im;
        double r8232 = cos(r8231);
        double r8233 = r8230 * r8232;
        return r8233;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019194 
(FPCore (re im)
  :name "math.exp on complex, real part"
  (* (exp re) (cos im)))

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