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

\frac{x + \frac{y \cdot z - x}{t \cdot z - x}}{x + 1}

double f(double x, double y, double z, double t) {
        double r9350 = x;
        double r9351 = y;
        double r9352 = z;
        double r9353 = r9351 * r9352;
        double r9354 = r9353 - r9350;
        double r9355 = t;
        double r9356 = r9355 * r9352;
        double r9357 = r9356 - r9350;
        double r9358 = r9354 / r9357;
        double r9359 = r9350 + r9358;
        double r9360 = 1.0;
        double r9361 = r9350 + r9360;
        double r9362 = r9359 / r9361;
        return r9362;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019194 
(FPCore (x y z t)
  :name "Diagrams.Trail:splitAtParam  from diagrams-lib-1.3.0.3, A"

  :herbie-target
  (/ (+ x (- (/ y (- t (/ x z))) (/ x (- (* t z) x)))) (+ x 1.0))

  (/ (+ x (/ (- (* y z) x) (- (* t z) x))) (+ x 1.0)))

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