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

\left(\left(x \cdot y + y \cdot y\right) - y \cdot z\right) - y \cdot y

double f(double x, double y, double z) {
        double r8921 = x;
        double r8922 = y;
        double r8923 = r8921 * r8922;
        double r8924 = r8922 * r8922;
        double r8925 = r8923 + r8924;
        double r8926 = z;
        double r8927 = r8922 * r8926;
        double r8928 = r8925 - r8927;
        double r8929 = r8928 - r8924;
        return r8929;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019179 +o rules:numerics
(FPCore (x y z)
  :name "Linear.Quaternion:$c/ from linear-1.19.1.3, C"

  :herbie-target
  (* (- x z) y)

  (- (- (+ (* x y) (* y y)) (* y z)) (* y y)))

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	217	0
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/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