Exception for Data.Number.Erf:$cinvnormcdf from erf-2.0.0.0, B

Math

\[x - \frac{y}{1 + \frac{x \cdot y}{2}}\]

C

double f(double x, double y) {
        double r8061 = x;
        double r8062 = y;
        double r8063 = 1.0;
        double r8064 = r8061 * r8062;
        double r8065 = 2.0;
        double r8066 = r8064 / r8065;
        double r8067 = r8063 + r8066;
        double r8068 = r8062 / r8067;
        double r8069 = r8061 - r8068;
        return r8069;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (x y)
  :name "Data.Number.Erf:$cinvnormcdf from erf-2.0.0.0, B"
  (- x (/ y (+ 1.0 (/ (* x y) 2.0)))))

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