Exception for math.arg on complex

Math

\[\tan^{-1}_* \frac{im}{re}\]

C

double code(double re, double im) {
	return ((double) atan2(im, re));
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2020155 
(FPCore (re im)
  :name "math.arg on complex"
  :precision binary64
  (atan2 im re))

Backtrace

hash-ref: no value found for key key: 're		L	C
range-table->hyperrects	/data/pavpan/nightlies/herbie/ival-find-range/src/findroot.rkt	58	0
make-sampler	/data/pavpan/nightlies/herbie/ival-find-range/src/points.rkt	124	0
prepare-points-intervals	/data/pavpan/nightlies/herbie/ival-find-range/src/points.rkt	155	0
run-improve47	/data/pavpan/nightlies/herbie/ival-find-range/src/mainloop.rkt	365	0
.../more-scheme.rkt:261:28	unknown
run	/opt/racket-7.5/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.5/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.5/collects/racket/private/more-scheme.rkt	261	28

Reproduce

herbie shell --seed 2020155 
(FPCore (re im)
  :name "math.arg on complex"
  :precision binary64
  (atan2 im re))