Exception for (pow (- 20) (/ (- 1) 3))

Math

\[{\left(-20\right)}^{\left(\frac{-1}{3}\right)}\]

Reproduce

herbie shell --seed 2020152 
(FPCore ()
  :name "(pow (- 20) (/ (- 1) 3))"
  :precision binary64
  (pow (neg 20.0) (/ (neg 1.0) 3.0)))