Cannot sample enough valid points. (more)

\[\frac{1 - \sqrt{1 - 2^{2}}}{2}\]

\frac{1 - \sqrt{1 - 2^{2}}}{2}

double code() {
	return ((double) (((double) (1.0 - ((double) sqrt(((double) (1.0 - ((double) exp2(2.0)))))))) / 2.0));
}

Reproduce

herbie shell --seed 2020152 
(FPCore ()
  :name "(/ (- 1 (sqrt (- 1 (exp2 2)))) 2)"
  :precision binary64
  (/ (- 1.0 (sqrt (- 1.0 (exp2 2.0)))) 2.0))