Exception for NMSE Section 6.1 mentioned, B

Math

\[\left(\frac{\pi}{2} \cdot \frac{1}{b \cdot b - a \cdot a}\right) \cdot \left(\frac{1}{a} - \frac{1}{b}\right)\]

C

double f(double a, double b) {
        double r8218 = atan2(1.0, 0.0);
        double r8219 = 2.0;
        double r8220 = r8218 / r8219;
        double r8221 = 1.0;
        double r8222 = b;
        double r8223 = r8222 * r8222;
        double r8224 = a;
        double r8225 = r8224 * r8224;
        double r8226 = r8223 - r8225;
        double r8227 = r8221 / r8226;
        double r8228 = r8220 * r8227;
        double r8229 = r8221 / r8224;
        double r8230 = r8221 / r8222;
        double r8231 = r8229 - r8230;
        double r8232 = r8228 * r8231;
        return r8232;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019179 
(FPCore (a b)
  :name "NMSE Section 6.1 mentioned, B"
  (* (* (/ PI 2.0) (/ 1.0 (- (* b b) (* a a)))) (- (/ 1.0 a) (/ 1.0 b))))

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