Exception for Diagrams.Solve.Polynomial:quartForm from diagrams-solve-0.1, D

Math

\[\frac{x \cdot y}{2} - \frac{z}{8}\]

C

double f(double x, double y, double z) {
        double r8339 = x;
        double r8340 = y;
        double r8341 = r8339 * r8340;
        double r8342 = 2.0;
        double r8343 = r8341 / r8342;
        double r8344 = z;
        double r8345 = 8.0;
        double r8346 = r8344 / r8345;
        double r8347 = r8343 - r8346;
        return r8347;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019194 
(FPCore (x y z)
  :name "Diagrams.Solve.Polynomial:quartForm  from diagrams-solve-0.1, D"
  (- (/ (* x y) 2.0) (/ z 8.0)))

Backtrace

result arity mismatch; expected number of values not received expected: 2 received: 1 in: local-binding form values...: 0		L	C
loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/extraction.rkt	25	2
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	220	0
run-improve47	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	342	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