Exception for Graphics.Rasterific.QuadraticFormula:discriminant from Rasterific-0.6.1

Math

\[x \cdot x - \left(y \cdot 4\right) \cdot z\]

C

double f(double x, double y, double z) {
        double r8282 = x;
        double r8283 = r8282 * r8282;
        double r8284 = y;
        double r8285 = 4.0;
        double r8286 = r8284 * r8285;
        double r8287 = z;
        double r8288 = r8286 * r8287;
        double r8289 = r8283 - r8288;
        return r8289;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 +o rules:numerics
(FPCore (x y z)
  :name "Graphics.Rasterific.QuadraticFormula:discriminant from Rasterific-0.6.1"
  (- (* x x) (* (* y 4.0) z)))

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